<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html>
<head>
<!-- Generated by HsColour, http://www.cs.york.ac.uk/fp/darcs/hscolour/ -->
<title>Data/Text/Fusion/Common.hs</title>
<link type='text/css' rel='stylesheet' href='hscolour.css' />
</head>
<body>
<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns, Rank2Types #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- |</span>
<a name="line-3"></a><span class='hs-comment'>-- Module : Data.Text.Fusion.Common</span>
<a name="line-4"></a><span class='hs-comment'>-- Copyright : (c) Bryan O'Sullivan 2009</span>
<a name="line-5"></a><span class='hs-comment'>--</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-7"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com, rtomharper@googlemail.com,</span>
<a name="line-8"></a><span class='hs-comment'>-- duncan@haskell.org</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- Common stream fusion functionality for text.</span>
<a name="line-13"></a>
<a name="line-14"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span>
<a name="line-15"></a> <span class='hs-layout'>(</span>
<a name="line-16"></a> <span class='hs-comment'>-- * Creation and elimination</span>
<a name="line-17"></a> <span class='hs-varid'>singleton</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>streamList</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unstreamList</span>
<a name="line-20"></a>
<a name="line-21"></a> <span class='hs-comment'>-- * Basic interface</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>cons</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>snoc</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>append</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>head</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>uncons</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>last</span>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>tail</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>init</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>null</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>lengthI</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>compareLengthI</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isSingleton</span>
<a name="line-34"></a>
<a name="line-35"></a> <span class='hs-comment'>-- * Transformations</span>
<a name="line-36"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>map</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>intercalate</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>intersperse</span>
<a name="line-39"></a>
<a name="line-40"></a> <span class='hs-comment'>-- ** Case conversion</span>
<a name="line-41"></a> <span class='hs-comment'>-- $case</span>
<a name="line-42"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toCaseFold</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toLower</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toUpper</span>
<a name="line-45"></a>
<a name="line-46"></a> <span class='hs-comment'>-- ** Justification</span>
<a name="line-47"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>justifyLeftI</span>
<a name="line-48"></a>
<a name="line-49"></a> <span class='hs-comment'>-- * Folds</span>
<a name="line-50"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldl</span>
<a name="line-51"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldl'</span>
<a name="line-52"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldl1</span>
<a name="line-53"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldl1'</span>
<a name="line-54"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldr</span>
<a name="line-55"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldr1</span>
<a name="line-56"></a>
<a name="line-57"></a> <span class='hs-comment'>-- ** Special folds</span>
<a name="line-58"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>concat</span>
<a name="line-59"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>concatMap</span>
<a name="line-60"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>any</span>
<a name="line-61"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>all</span>
<a name="line-62"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>maximum</span>
<a name="line-63"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>minimum</span>
<a name="line-64"></a>
<a name="line-65"></a> <span class='hs-comment'>-- * Construction</span>
<a name="line-66"></a> <span class='hs-comment'>-- ** Scans</span>
<a name="line-67"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>scanl</span>
<a name="line-68"></a>
<a name="line-69"></a> <span class='hs-comment'>-- ** Accumulating maps</span>
<a name="line-70"></a> <span class='hs-comment'>-- , mapAccumL</span>
<a name="line-71"></a>
<a name="line-72"></a> <span class='hs-comment'>-- ** Generation and unfolding</span>
<a name="line-73"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>replicateCharI</span>
<a name="line-74"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>replicateI</span>
<a name="line-75"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unfoldr</span>
<a name="line-76"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unfoldrNI</span>
<a name="line-77"></a>
<a name="line-78"></a> <span class='hs-comment'>-- * Substrings</span>
<a name="line-79"></a> <span class='hs-comment'>-- ** Breaking strings</span>
<a name="line-80"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>take</span>
<a name="line-81"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>drop</span>
<a name="line-82"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>takeWhile</span>
<a name="line-83"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>dropWhile</span>
<a name="line-84"></a>
<a name="line-85"></a> <span class='hs-comment'>-- * Predicates</span>
<a name="line-86"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isPrefixOf</span>
<a name="line-87"></a>
<a name="line-88"></a> <span class='hs-comment'>-- * Searching</span>
<a name="line-89"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>elem</span>
<a name="line-90"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>filter</span>
<a name="line-91"></a>
<a name="line-92"></a> <span class='hs-comment'>-- * Indexing</span>
<a name="line-93"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>findBy</span>
<a name="line-94"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>indexI</span>
<a name="line-95"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>findIndexI</span>
<a name="line-96"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>countCharI</span>
<a name="line-97"></a>
<a name="line-98"></a> <span class='hs-comment'>-- * Zipping and unzipping</span>
<a name="line-99"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>zipWith</span>
<a name="line-100"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-101"></a>
<a name="line-102"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-layout'>(</span><span class='hs-conid'>Bool</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Int</span><span class='hs-layout'>,</span> <span class='hs-conid'>Integral</span><span class='hs-layout'>,</span> <span class='hs-conid'>Maybe</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-103"></a> <span class='hs-conid'>Ord</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>Ordering</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-conid'>String</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>.</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>$</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>*</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-104"></a> <span class='hs-layout'>(</span><span class='hs-varop'>&&</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromIntegral</span><span class='hs-layout'>,</span> <span class='hs-varid'>otherwise</span><span class='hs-layout'>)</span>
<a name="line-105"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>L</span>
<a name="line-106"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Prelude</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>P</span>
<a name="line-107"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Int</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int64</span><span class='hs-layout'>)</span>
<a name="line-108"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span>
<a name="line-109"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>CaseMapping</span> <span class='hs-layout'>(</span><span class='hs-varid'>foldMapping</span><span class='hs-layout'>,</span> <span class='hs-varid'>lowerMapping</span><span class='hs-layout'>,</span> <span class='hs-varid'>upperMapping</span><span class='hs-layout'>)</span>
<a name="line-110"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Size</span>
<a name="line-111"></a>
<a name="line-112"></a><a name="singleton"></a><span class='hs-definition'>singleton</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-113"></a><span class='hs-definition'>singleton</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-conid'>False</span> <span class='hs-num'>1</span>
<a name="line-114"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>next</span> <span class='hs-conid'>False</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>c</span> <span class='hs-conid'>True</span>
<a name="line-115"></a> <span class='hs-varid'>next</span> <span class='hs-conid'>True</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-116"></a><span class='hs-comment'>{-# INLINE singleton #-}</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="streamList"></a><span class='hs-definition'>streamList</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>a</span>
<a name="line-119"></a><span class='hs-comment'>{-# INLINE [0] streamList #-}</span>
<a name="line-120"></a><span class='hs-definition'>streamList</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-varid'>unknownSize</span>
<a name="line-121"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>next</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-122"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs</span>
<a name="line-123"></a>
<a name="line-124"></a><a name="unstreamList"></a><span class='hs-definition'>unstreamList</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-125"></a><span class='hs-definition'>unstreamList</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>unfold</span> <span class='hs-varid'>s0</span>
<a name="line-126"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>unfold</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-127"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-128"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>unfold</span> <span class='hs-varid'>s'</span>
<a name="line-129"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span> <span class='hs-conop'>:</span> <span class='hs-varid'>unfold</span> <span class='hs-varid'>s'</span>
<a name="line-130"></a><span class='hs-comment'>{-# INLINE [0] unstreamList #-}</span>
<a name="line-131"></a>
<a name="line-132"></a><span class='hs-comment'>{-# RULES "STREAM streamList/unstreamList fusion" forall s. streamList (unstreamList s) = s #-}</span>
<a name="line-133"></a>
<a name="line-134"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-135"></a><span class='hs-comment'>-- * Basic stream functions</span>
<a name="line-136"></a>
<a name="line-137"></a><a name="C"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>C</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>C0</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span>
<a name="line-138"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>C1</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span>
<a name="line-139"></a>
<a name="line-140"></a><a name="cons"></a><span class='hs-comment'>-- | /O(n)/ Adds a character to the front of a Stream Char.</span>
<a name="line-141"></a><span class='hs-definition'>cons</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-142"></a><span class='hs-definition'>cons</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-keyword'>where</span>
<a name="line-144"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>C0</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-145"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>C0</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-146"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-147"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>C0</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-148"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>C0</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-149"></a><span class='hs-comment'>{-# INLINE [0] cons #-}</span>
<a name="line-150"></a>
<a name="line-151"></a><a name="snoc"></a><span class='hs-comment'>-- | /O(n)/ Adds a character to the end of a stream.</span>
<a name="line-152"></a><span class='hs-definition'>snoc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-153"></a><span class='hs-definition'>snoc</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>xs0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>J</span> <span class='hs-varid'>xs0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-154"></a> <span class='hs-keyword'>where</span>
<a name="line-155"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>J</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>xs</span> <span class='hs-keyword'>of</span>
<a name="line-156"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>w</span> <span class='hs-conid'>N</span>
<a name="line-157"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>xs'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>J</span> <span class='hs-varid'>xs'</span><span class='hs-layout'>)</span>
<a name="line-158"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>xs'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>J</span> <span class='hs-varid'>xs'</span><span class='hs-layout'>)</span>
<a name="line-159"></a> <span class='hs-varid'>next</span> <span class='hs-conid'>N</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-160"></a><span class='hs-comment'>{-# INLINE [0] snoc #-}</span>
<a name="line-161"></a>
<a name="line-162"></a><a name="E"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>E</span> <span class='hs-varid'>l</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span> <span class='hs-varop'>!</span><span class='hs-varid'>l</span>
<a name="line-163"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>R</span> <span class='hs-varop'>!</span><span class='hs-varid'>r</span>
<a name="line-164"></a>
<a name="line-165"></a><a name="append"></a><span class='hs-comment'>-- | /O(n)/ Appends one Stream to the other.</span>
<a name="line-166"></a><span class='hs-definition'>append</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-167"></a><span class='hs-definition'>append</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s01</span> <span class='hs-varid'>len1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next1</span> <span class='hs-varid'>s02</span> <span class='hs-varid'>len2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-168"></a> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span> <span class='hs-varid'>s01</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len1</span> <span class='hs-varop'>+</span> <span class='hs-varid'>len2</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <span class='hs-keyword'>where</span>
<a name="line-170"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span> <span class='hs-varid'>s1</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s1</span> <span class='hs-keyword'>of</span>
<a name="line-171"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>R</span> <span class='hs-varid'>s02</span><span class='hs-layout'>)</span>
<a name="line-172"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s1'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span>
<a name="line-173"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s1'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span>
<a name="line-174"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>R</span> <span class='hs-varid'>s2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next1</span> <span class='hs-varid'>s2</span> <span class='hs-keyword'>of</span>
<a name="line-175"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-176"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s2'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>R</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-177"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s2'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>R</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-178"></a><span class='hs-comment'>{-# INLINE [0] append #-}</span>
<a name="line-179"></a>
<a name="line-180"></a><a name="head"></a><span class='hs-comment'>-- | /O(1)/ Returns the first character of a Text, which must be non-empty.</span>
<a name="line-181"></a><span class='hs-comment'>-- Subject to array fusion.</span>
<a name="line-182"></a><span class='hs-definition'>head</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-183"></a><span class='hs-definition'>head</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_head</span> <span class='hs-varid'>s0</span>
<a name="line-184"></a> <span class='hs-keyword'>where</span>
<a name="line-185"></a> <span class='hs-varid'>loop_head</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-186"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-187"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_head</span> <span class='hs-varid'>s'</span>
<a name="line-188"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>streamError</span> <span class='hs-str'>"head"</span> <span class='hs-str'>"Empty stream"</span>
<a name="line-189"></a><span class='hs-comment'>{-# INLINE [0] head #-}</span>
<a name="line-190"></a>
<a name="line-191"></a><a name="uncons"></a><span class='hs-comment'>-- | /O(1)/ Returns the first character and remainder of a 'Stream</span>
<a name="line-192"></a><span class='hs-comment'>-- Char', or 'Nothing' if empty. Subject to array fusion.</span>
<a name="line-193"></a><span class='hs-definition'>uncons</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-194"></a><span class='hs-definition'>uncons</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_uncons</span> <span class='hs-varid'>s0</span>
<a name="line-195"></a> <span class='hs-keyword'>where</span>
<a name="line-196"></a> <span class='hs-varid'>loop_uncons</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-197"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s1</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s1</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-198"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_uncons</span> <span class='hs-varid'>s'</span>
<a name="line-199"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-200"></a><span class='hs-comment'>{-# INLINE [0] uncons #-}</span>
<a name="line-201"></a>
<a name="line-202"></a><a name="last"></a><span class='hs-comment'>-- | /O(n)/ Returns the last character of a 'Stream Char', which must</span>
<a name="line-203"></a><span class='hs-comment'>-- be non-empty.</span>
<a name="line-204"></a><span class='hs-definition'>last</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-205"></a><span class='hs-definition'>last</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop0_last</span> <span class='hs-varid'>s0</span>
<a name="line-206"></a> <span class='hs-keyword'>where</span>
<a name="line-207"></a> <span class='hs-varid'>loop0_last</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-208"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"last"</span>
<a name="line-209"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop0_last</span> <span class='hs-varid'>s'</span>
<a name="line-210"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_last</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-211"></a> <span class='hs-varid'>loop_last</span> <span class='hs-varop'>!</span><span class='hs-varid'>x</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-212"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-213"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_last</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-214"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x'</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_last</span> <span class='hs-varid'>x'</span> <span class='hs-varid'>s'</span>
<a name="line-215"></a><span class='hs-comment'>{-# INLINE[0] last #-}</span>
<a name="line-216"></a>
<a name="line-217"></a><a name="tail"></a><span class='hs-comment'>-- | /O(1)/ Returns all characters after the head of a Stream Char, which must</span>
<a name="line-218"></a><span class='hs-comment'>-- be non-empty.</span>
<a name="line-219"></a><span class='hs-definition'>tail</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-220"></a><span class='hs-definition'>tail</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>C0</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-221"></a> <span class='hs-keyword'>where</span>
<a name="line-222"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>C0</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-223"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"tail"</span>
<a name="line-224"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>C0</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-225"></a> <span class='hs-conid'>Yield</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-226"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-227"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-228"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-229"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>C1</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-230"></a><span class='hs-comment'>{-# INLINE [0] tail #-}</span>
<a name="line-231"></a>
<a name="line-232"></a><a name="Init"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Init</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Init0</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span>
<a name="line-233"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Init1</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Char</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span>
<a name="line-234"></a>
<a name="line-235"></a><a name="init"></a><span class='hs-comment'>-- | /O(1)/ Returns all but the last character of a Stream Char, which</span>
<a name="line-236"></a><span class='hs-comment'>-- must be non-empty.</span>
<a name="line-237"></a><span class='hs-definition'>init</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-238"></a><span class='hs-definition'>init</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>Init0</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-239"></a> <span class='hs-keyword'>where</span>
<a name="line-240"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>Init0</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-241"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"init"</span>
<a name="line-242"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>Init0</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-243"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>Init1</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-244"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>Init1</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-245"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-246"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>Init1</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-247"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x'</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>Init1</span> <span class='hs-varid'>x'</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-248"></a><span class='hs-comment'>{-# INLINE [0] init #-}</span>
<a name="line-249"></a>
<a name="line-250"></a><a name="null"></a><span class='hs-comment'>-- | /O(1)/ Tests whether a Stream Char is empty or not.</span>
<a name="line-251"></a><span class='hs-definition'>null</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-252"></a><span class='hs-definition'>null</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_null</span> <span class='hs-varid'>s0</span>
<a name="line-253"></a> <span class='hs-keyword'>where</span>
<a name="line-254"></a> <span class='hs-varid'>loop_null</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-255"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-256"></a> <span class='hs-conid'>Yield</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-257"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_null</span> <span class='hs-varid'>s'</span>
<a name="line-258"></a><span class='hs-comment'>{-# INLINE[0] null #-}</span>
<a name="line-259"></a>
<a name="line-260"></a><a name="lengthI"></a><span class='hs-comment'>-- | /O(n)/ Returns the number of characters in a string.</span>
<a name="line-261"></a><span class='hs-definition'>lengthI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-262"></a><span class='hs-definition'>lengthI</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_length</span> <span class='hs-num'>0</span> <span class='hs-varid'>s0</span>
<a name="line-263"></a> <span class='hs-keyword'>where</span>
<a name="line-264"></a> <span class='hs-varid'>loop_length</span> <span class='hs-varop'>!</span><span class='hs-varid'>z</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-265"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span>
<a name="line-266"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_length</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-267"></a> <span class='hs-conid'>Yield</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_length</span> <span class='hs-layout'>(</span><span class='hs-varid'>z</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-268"></a><span class='hs-comment'>{-# INLINE[0] lengthI #-}</span>
<a name="line-269"></a>
<a name="line-270"></a><a name="compareLengthI"></a><span class='hs-comment'>-- | /O(n)/ Compares the count of characters in a string to a number.</span>
<a name="line-271"></a><span class='hs-comment'>-- Subject to fusion.</span>
<a name="line-272"></a><span class='hs-comment'>--</span>
<a name="line-273"></a><span class='hs-comment'>-- This function gives the same answer as comparing against the result</span>
<a name="line-274"></a><span class='hs-comment'>-- of 'lengthI', but can short circuit if the count of characters is</span>
<a name="line-275"></a><span class='hs-comment'>-- greater than the number, and hence be more efficient.</span>
<a name="line-276"></a><span class='hs-definition'>compareLengthI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ordering</span>
<a name="line-277"></a><span class='hs-definition'>compareLengthI</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span>
<a name="line-278"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>exactly</span> <span class='hs-varid'>len</span> <span class='hs-keyword'>of</span>
<a name="line-279"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_cmp</span> <span class='hs-num'>0</span> <span class='hs-varid'>s0</span>
<a name="line-280"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>compare</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>n</span>
<a name="line-281"></a> <span class='hs-keyword'>where</span>
<a name="line-282"></a> <span class='hs-varid'>loop_cmp</span> <span class='hs-varop'>!</span><span class='hs-varid'>z</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-283"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>compare</span> <span class='hs-varid'>z</span> <span class='hs-varid'>n</span>
<a name="line-284"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_cmp</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-285"></a> <span class='hs-conid'>Yield</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>z</span> <span class='hs-varop'>></span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>GT</span>
<a name="line-286"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_cmp</span> <span class='hs-layout'>(</span><span class='hs-varid'>z</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-287"></a><span class='hs-comment'>{-# INLINE[0] compareLengthI #-}</span>
<a name="line-288"></a>
<a name="line-289"></a><a name="isSingleton"></a><span class='hs-comment'>-- | /O(n)/ Indicate whether a string contains exactly one element.</span>
<a name="line-290"></a><span class='hs-definition'>isSingleton</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-291"></a><span class='hs-definition'>isSingleton</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-varid'>s0</span>
<a name="line-292"></a> <span class='hs-keyword'>where</span>
<a name="line-293"></a> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>z</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-294"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span> <span class='hs-varop'>==</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-keyglyph'>::</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-295"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-296"></a> <span class='hs-conid'>Yield</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s'</span>
<a name="line-297"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>z</span> <span class='hs-varop'>>=</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-298"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>z</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-299"></a><span class='hs-comment'>{-# INLINE[0] isSingleton #-}</span>
<a name="line-300"></a>
<a name="line-301"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-302"></a><span class='hs-comment'>-- * Stream transformations</span>
<a name="line-303"></a>
<a name="line-304"></a><a name="map"></a><span class='hs-comment'>-- | /O(n)/ 'map' @f @xs is the Stream Char obtained by applying @f@</span>
<a name="line-305"></a><span class='hs-comment'>-- to each element of @xs@.</span>
<a name="line-306"></a><span class='hs-definition'>map</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-307"></a><span class='hs-definition'>map</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span>
<a name="line-308"></a> <span class='hs-keyword'>where</span>
<a name="line-309"></a> <span class='hs-varid'>next</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-310"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-311"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span>
<a name="line-312"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-313"></a><span class='hs-comment'>{-# INLINE [0] map #-}</span>
<a name="line-314"></a>
<a name="line-315"></a><span class='hs-comment'>{-#
<a name="line-316"></a> RULES "STREAM map/map fusion" forall f g s.
<a name="line-317"></a> map f (map g s) = map (\x -> f (g x)) s
<a name="line-318"></a> #-}</span>
<a name="line-319"></a>
<a name="line-320"></a><a name="I"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>I</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I1</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span>
<a name="line-321"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>I2</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Char</span>
<a name="line-322"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>I3</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span>
<a name="line-323"></a>
<a name="line-324"></a><a name="intersperse"></a><span class='hs-comment'>-- | /O(n)/ Take a character and place it between each of the</span>
<a name="line-325"></a><span class='hs-comment'>-- characters of a 'Stream Char'.</span>
<a name="line-326"></a><span class='hs-definition'>intersperse</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-327"></a><span class='hs-definition'>intersperse</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>I1</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-varid'>len</span>
<a name="line-328"></a> <span class='hs-keyword'>where</span>
<a name="line-329"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>I1</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-330"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-331"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>I1</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-332"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>I2</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-333"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>I2</span> <span class='hs-varid'>s</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>I3</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-334"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>I3</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-335"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-336"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>I3</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-337"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-conid'>I2</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-338"></a><span class='hs-comment'>{-# INLINE [0] intersperse #-}</span>
<a name="line-339"></a>
<a name="line-340"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-341"></a><span class='hs-comment'>-- ** Case conversions (folds)</span>
<a name="line-342"></a>
<a name="line-343"></a><span class='hs-comment'>-- $case</span>
<a name="line-344"></a><span class='hs-comment'>--</span>
<a name="line-345"></a><span class='hs-comment'>-- With Unicode text, it is incorrect to use combinators like @map</span>
<a name="line-346"></a><span class='hs-comment'>-- toUpper@ to case convert each character of a string individually.</span>
<a name="line-347"></a><span class='hs-comment'>-- Instead, use the whole-string case conversion functions from this</span>
<a name="line-348"></a><span class='hs-comment'>-- module. For correctness in different writing systems, these</span>
<a name="line-349"></a><span class='hs-comment'>-- functions may map one input character to two or three output</span>
<a name="line-350"></a><span class='hs-comment'>-- characters.</span>
<a name="line-351"></a>
<a name="line-352"></a><a name="caseConvert"></a><span class='hs-definition'>caseConvert</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>s</span><span class='hs-varop'>.</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Step</span> <span class='hs-layout'>(</span><span class='hs-conid'>CC</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span>
<a name="line-353"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-354"></a><span class='hs-definition'>caseConvert</span> <span class='hs-varid'>remap</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>CC</span> <span class='hs-varid'>s0</span> <span class='hs-chr'>'\0'</span> <span class='hs-chr'>'\0'</span><span class='hs-layout'>)</span> <span class='hs-varid'>len</span>
<a name="line-355"></a> <span class='hs-keyword'>where</span>
<a name="line-356"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>CC</span> <span class='hs-varid'>s</span> <span class='hs-chr'>'\0'</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-357"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-358"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-359"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>CC</span> <span class='hs-varid'>s'</span> <span class='hs-chr'>'\0'</span> <span class='hs-chr'>'\0'</span><span class='hs-layout'>)</span>
<a name="line-360"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>c</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>remap</span> <span class='hs-varid'>c</span> <span class='hs-varid'>s'</span>
<a name="line-361"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>CC</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>CC</span> <span class='hs-varid'>s</span> <span class='hs-varid'>b</span> <span class='hs-chr'>'\0'</span><span class='hs-layout'>)</span>
<a name="line-362"></a>
<a name="line-363"></a><a name="toCaseFold"></a><span class='hs-comment'>-- | /O(n)/ Convert a string to folded case. This function is mainly</span>
<a name="line-364"></a><span class='hs-comment'>-- useful for performing caseless (or case insensitive) string</span>
<a name="line-365"></a><span class='hs-comment'>-- comparisons.</span>
<a name="line-366"></a><span class='hs-comment'>--</span>
<a name="line-367"></a><span class='hs-comment'>-- A string @x@ is a caseless match for a string @y@ if and only if:</span>
<a name="line-368"></a><span class='hs-comment'>--</span>
<a name="line-369"></a><span class='hs-comment'>-- @toCaseFold x == toCaseFold y@</span>
<a name="line-370"></a><span class='hs-comment'>--</span>
<a name="line-371"></a><span class='hs-comment'>-- The result string may be longer than the input string, and may</span>
<a name="line-372"></a><span class='hs-comment'>-- differ from applying 'toLower' to the input string. For instance,</span>
<a name="line-373"></a><span class='hs-comment'>-- the Armenian small ligature men now (U+FB13) is case folded to the</span>
<a name="line-374"></a><span class='hs-comment'>-- bigram men now (U+0574 U+0576), while the micro sign (U+00B5) is</span>
<a name="line-375"></a><span class='hs-comment'>-- case folded to the Greek small letter letter mu (U+03BC) instead of</span>
<a name="line-376"></a><span class='hs-comment'>-- itself.</span>
<a name="line-377"></a><span class='hs-definition'>toCaseFold</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-378"></a><span class='hs-definition'>toCaseFold</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>caseConvert</span> <span class='hs-varid'>foldMapping</span>
<a name="line-379"></a><span class='hs-comment'>{-# INLINE [0] toCaseFold #-}</span>
<a name="line-380"></a>
<a name="line-381"></a><a name="toUpper"></a><span class='hs-comment'>-- | /O(n)/ Convert a string to upper case, using simple case</span>
<a name="line-382"></a><span class='hs-comment'>-- conversion. The result string may be longer than the input string.</span>
<a name="line-383"></a><span class='hs-comment'>-- For instance, the German eszett (U+00DF) maps to the two-letter</span>
<a name="line-384"></a><span class='hs-comment'>-- sequence SS.</span>
<a name="line-385"></a><span class='hs-definition'>toUpper</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-386"></a><span class='hs-definition'>toUpper</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>caseConvert</span> <span class='hs-varid'>upperMapping</span>
<a name="line-387"></a><span class='hs-comment'>{-# INLINE [0] toUpper #-}</span>
<a name="line-388"></a>
<a name="line-389"></a><a name="toLower"></a><span class='hs-comment'>-- | /O(n)/ Convert a string to lower case, using simple case</span>
<a name="line-390"></a><span class='hs-comment'>-- conversion. The result string may be longer than the input string.</span>
<a name="line-391"></a><span class='hs-comment'>-- For instance, the Latin capital letter I with dot above (U+0130)</span>
<a name="line-392"></a><span class='hs-comment'>-- maps to the sequence Latin small letter i (U+0069) followed by</span>
<a name="line-393"></a><span class='hs-comment'>-- combining dot above (U+0307).</span>
<a name="line-394"></a><span class='hs-definition'>toLower</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-395"></a><span class='hs-definition'>toLower</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>caseConvert</span> <span class='hs-varid'>lowerMapping</span>
<a name="line-396"></a><span class='hs-comment'>{-# INLINE [0] toLower #-}</span>
<a name="line-397"></a>
<a name="line-398"></a><a name="justifyLeftI"></a><span class='hs-definition'>justifyLeftI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-399"></a><span class='hs-definition'>justifyLeftI</span> <span class='hs-varid'>k</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-400"></a> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>s0</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>larger</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-401"></a> <span class='hs-keyword'>where</span>
<a name="line-402"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-403"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-404"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-405"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-varid'>s'</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-406"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>s'</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-407"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-408"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>n</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-409"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-410"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-411"></a><span class='hs-comment'>{-# INLINE [0] justifyLeftI #-}</span>
<a name="line-412"></a>
<a name="line-413"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-414"></a><span class='hs-comment'>-- * Reducing Streams (folds)</span>
<a name="line-415"></a>
<a name="line-416"></a><a name="foldl"></a><span class='hs-comment'>-- | foldl, applied to a binary operator, a starting value (typically the</span>
<a name="line-417"></a><span class='hs-comment'>-- left-identity of the operator), and a Stream, reduces the Stream using the</span>
<a name="line-418"></a><span class='hs-comment'>-- binary operator, from left to right.</span>
<a name="line-419"></a><span class='hs-definition'>foldl</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-420"></a><span class='hs-definition'>foldl</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z0</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_foldl</span> <span class='hs-varid'>z0</span> <span class='hs-varid'>s0</span>
<a name="line-421"></a> <span class='hs-keyword'>where</span>
<a name="line-422"></a> <span class='hs-varid'>loop_foldl</span> <span class='hs-varid'>z</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-423"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span>
<a name="line-424"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-425"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-426"></a><span class='hs-comment'>{-# INLINE [0] foldl #-}</span>
<a name="line-427"></a>
<a name="line-428"></a><a name="foldl'"></a><span class='hs-comment'>-- | A strict version of foldl.</span>
<a name="line-429"></a><span class='hs-definition'>foldl'</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-430"></a><span class='hs-definition'>foldl'</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z0</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_foldl'</span> <span class='hs-varid'>z0</span> <span class='hs-varid'>s0</span>
<a name="line-431"></a> <span class='hs-keyword'>where</span>
<a name="line-432"></a> <span class='hs-varid'>loop_foldl'</span> <span class='hs-varop'>!</span><span class='hs-varid'>z</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-433"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span>
<a name="line-434"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl'</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-435"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl'</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-436"></a><span class='hs-comment'>{-# INLINE [0] foldl' #-}</span>
<a name="line-437"></a>
<a name="line-438"></a><a name="foldl1"></a><span class='hs-comment'>-- | foldl1 is a variant of foldl that has no starting value argument,</span>
<a name="line-439"></a><span class='hs-comment'>-- and thus must be applied to non-empty Streams.</span>
<a name="line-440"></a><span class='hs-definition'>foldl1</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-441"></a><span class='hs-definition'>foldl1</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop0_foldl1</span> <span class='hs-varid'>s0</span>
<a name="line-442"></a> <span class='hs-keyword'>where</span>
<a name="line-443"></a> <span class='hs-varid'>loop0_foldl1</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-444"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop0_foldl1</span> <span class='hs-varid'>s'</span>
<a name="line-445"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl1</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-446"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"foldl1"</span>
<a name="line-447"></a> <span class='hs-varid'>loop_foldl1</span> <span class='hs-varid'>z</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-448"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span>
<a name="line-449"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl1</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-450"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl1</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-451"></a><span class='hs-comment'>{-# INLINE [0] foldl1 #-}</span>
<a name="line-452"></a>
<a name="line-453"></a><a name="foldl1'"></a><span class='hs-comment'>-- | A strict version of foldl1.</span>
<a name="line-454"></a><span class='hs-definition'>foldl1'</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-455"></a><span class='hs-definition'>foldl1'</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop0_foldl1'</span> <span class='hs-varid'>s0</span>
<a name="line-456"></a> <span class='hs-keyword'>where</span>
<a name="line-457"></a> <span class='hs-varid'>loop0_foldl1'</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-458"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop0_foldl1'</span> <span class='hs-varid'>s'</span>
<a name="line-459"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl1'</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-460"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"foldl1"</span>
<a name="line-461"></a> <span class='hs-varid'>loop_foldl1'</span> <span class='hs-varop'>!</span><span class='hs-varid'>z</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-462"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span>
<a name="line-463"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl1'</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-464"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldl1'</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-465"></a><span class='hs-comment'>{-# INLINE [0] foldl1' #-}</span>
<a name="line-466"></a>
<a name="line-467"></a><a name="foldr"></a><span class='hs-comment'>-- | 'foldr', applied to a binary operator, a starting value (typically the</span>
<a name="line-468"></a><span class='hs-comment'>-- right-identity of the operator), and a stream, reduces the stream using the</span>
<a name="line-469"></a><span class='hs-comment'>-- binary operator, from right to left.</span>
<a name="line-470"></a><span class='hs-definition'>foldr</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-471"></a><span class='hs-definition'>foldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_foldr</span> <span class='hs-varid'>s0</span>
<a name="line-472"></a> <span class='hs-keyword'>where</span>
<a name="line-473"></a> <span class='hs-varid'>loop_foldr</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-474"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span>
<a name="line-475"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldr</span> <span class='hs-varid'>s'</span>
<a name="line-476"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>loop_foldr</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-477"></a><span class='hs-comment'>{-# INLINE [0] foldr #-}</span>
<a name="line-478"></a>
<a name="line-479"></a><a name="foldr1"></a><span class='hs-comment'>-- | foldr1 is a variant of 'foldr' that has no starting value argument,</span>
<a name="line-480"></a><span class='hs-comment'>-- and thus must be applied to non-empty streams.</span>
<a name="line-481"></a><span class='hs-comment'>-- Subject to array fusion.</span>
<a name="line-482"></a><span class='hs-definition'>foldr1</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-483"></a><span class='hs-definition'>foldr1</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop0_foldr1</span> <span class='hs-varid'>s0</span>
<a name="line-484"></a> <span class='hs-keyword'>where</span>
<a name="line-485"></a> <span class='hs-varid'>loop0_foldr1</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-486"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"foldr1"</span>
<a name="line-487"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop0_foldr1</span> <span class='hs-varid'>s'</span>
<a name="line-488"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldr1</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-489"></a>
<a name="line-490"></a> <span class='hs-varid'>loop_foldr1</span> <span class='hs-varid'>x</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-491"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-492"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_foldr1</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-493"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x'</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>loop_foldr1</span> <span class='hs-varid'>x'</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-494"></a><span class='hs-comment'>{-# INLINE [0] foldr1 #-}</span>
<a name="line-495"></a>
<a name="line-496"></a><a name="intercalate"></a><span class='hs-definition'>intercalate</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-497"></a><span class='hs-definition'>intercalate</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>intersperse</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-498"></a><span class='hs-comment'>{-# INLINE [0] intercalate #-}</span>
<a name="line-499"></a>
<a name="line-500"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-501"></a><span class='hs-comment'>-- ** Special folds</span>
<a name="line-502"></a>
<a name="line-503"></a><a name="concat"></a><span class='hs-comment'>-- | /O(n)/ Concatenate a list of streams. Subject to array fusion.</span>
<a name="line-504"></a><span class='hs-definition'>concat</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-505"></a><span class='hs-definition'>concat</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>foldr</span> <span class='hs-varid'>append</span> <span class='hs-varid'>empty</span>
<a name="line-506"></a><span class='hs-comment'>{-# INLINE [0] concat #-}</span>
<a name="line-507"></a>
<a name="line-508"></a><a name="concatMap"></a><span class='hs-comment'>-- | Map a function over a stream that results in a stream and concatenate the</span>
<a name="line-509"></a><span class='hs-comment'>-- results.</span>
<a name="line-510"></a><span class='hs-definition'>concatMap</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-511"></a><span class='hs-definition'>concatMap</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-layout'>(</span><span class='hs-varid'>append</span> <span class='hs-varop'>.</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-varid'>empty</span>
<a name="line-512"></a><span class='hs-comment'>{-# INLINE [0] concatMap #-}</span>
<a name="line-513"></a>
<a name="line-514"></a><a name="any"></a><span class='hs-comment'>-- | /O(n)/ any @p @xs determines if any character in the stream</span>
<a name="line-515"></a><span class='hs-comment'>-- @xs@ satisifes the predicate @p@.</span>
<a name="line-516"></a><span class='hs-definition'>any</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-517"></a><span class='hs-definition'>any</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_any</span> <span class='hs-varid'>s0</span>
<a name="line-518"></a> <span class='hs-keyword'>where</span>
<a name="line-519"></a> <span class='hs-varid'>loop_any</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-520"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-521"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_any</span> <span class='hs-varid'>s'</span>
<a name="line-522"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-523"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_any</span> <span class='hs-varid'>s'</span>
<a name="line-524"></a><span class='hs-comment'>{-# INLINE [0] any #-}</span>
<a name="line-525"></a>
<a name="line-526"></a><a name="all"></a><span class='hs-comment'>-- | /O(n)/ all @p @xs determines if all characters in the 'Text'</span>
<a name="line-527"></a><span class='hs-comment'>-- @xs@ satisify the predicate @p@.</span>
<a name="line-528"></a><span class='hs-definition'>all</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-529"></a><span class='hs-definition'>all</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_all</span> <span class='hs-varid'>s0</span>
<a name="line-530"></a> <span class='hs-keyword'>where</span>
<a name="line-531"></a> <span class='hs-varid'>loop_all</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-532"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-533"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_all</span> <span class='hs-varid'>s'</span>
<a name="line-534"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_all</span> <span class='hs-varid'>s'</span>
<a name="line-535"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-536"></a><span class='hs-comment'>{-# INLINE [0] all #-}</span>
<a name="line-537"></a>
<a name="line-538"></a><a name="maximum"></a><span class='hs-comment'>-- | /O(n)/ maximum returns the maximum value from a stream, which must be</span>
<a name="line-539"></a><span class='hs-comment'>-- non-empty.</span>
<a name="line-540"></a><span class='hs-definition'>maximum</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-541"></a><span class='hs-definition'>maximum</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop0_maximum</span> <span class='hs-varid'>s0</span>
<a name="line-542"></a> <span class='hs-keyword'>where</span>
<a name="line-543"></a> <span class='hs-varid'>loop0_maximum</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-544"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"maximum"</span>
<a name="line-545"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop0_maximum</span> <span class='hs-varid'>s'</span>
<a name="line-546"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_maximum</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-547"></a> <span class='hs-varid'>loop_maximum</span> <span class='hs-varop'>!</span><span class='hs-varid'>z</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-548"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span>
<a name="line-549"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_maximum</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-550"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-551"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>></span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_maximum</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-552"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_maximum</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-553"></a><span class='hs-comment'>{-# INLINE [0] maximum #-}</span>
<a name="line-554"></a>
<a name="line-555"></a><a name="minimum"></a><span class='hs-comment'>-- | /O(n)/ minimum returns the minimum value from a 'Text', which must be</span>
<a name="line-556"></a><span class='hs-comment'>-- non-empty.</span>
<a name="line-557"></a><span class='hs-definition'>minimum</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-558"></a><span class='hs-definition'>minimum</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop0_minimum</span> <span class='hs-varid'>s0</span>
<a name="line-559"></a> <span class='hs-keyword'>where</span>
<a name="line-560"></a> <span class='hs-varid'>loop0_minimum</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-561"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>emptyError</span> <span class='hs-str'>"minimum"</span>
<a name="line-562"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop0_minimum</span> <span class='hs-varid'>s'</span>
<a name="line-563"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_minimum</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-564"></a> <span class='hs-varid'>loop_minimum</span> <span class='hs-varop'>!</span><span class='hs-varid'>z</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-565"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>z</span>
<a name="line-566"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_minimum</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-567"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-568"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'><</span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_minimum</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-569"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_minimum</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s'</span>
<a name="line-570"></a><span class='hs-comment'>{-# INLINE [0] minimum #-}</span>
<a name="line-571"></a>
<a name="line-572"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-573"></a><span class='hs-comment'>-- * Building streams</span>
<a name="line-574"></a>
<a name="line-575"></a><a name="scanl"></a><span class='hs-definition'>scanl</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-576"></a><span class='hs-definition'>scanl</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z0</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>z0</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- HINT maybe too low</span>
<a name="line-577"></a> <span class='hs-keyword'>where</span>
<a name="line-578"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-579"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>z</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>z</span> <span class='hs-layout'>(</span><span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>z</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-580"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>z</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-581"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>x'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>z</span> <span class='hs-varid'>x</span>
<a name="line-582"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x'</span> <span class='hs-layout'>(</span><span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>x'</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-583"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>z</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-584"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-585"></a><span class='hs-comment'>{-# INLINE [0] scanl #-}</span>
<a name="line-586"></a>
<a name="line-587"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-588"></a><span class='hs-comment'>-- ** Accumulating maps</span>
<a name="line-589"></a>
<a name="line-590"></a><span class='hs-comment'>{-
<a name="line-591"></a>-- | /O(n)/ Like a combination of 'map' and 'foldl'. Applies a
<a name="line-592"></a>-- function to each element of a stream, passing an accumulating
<a name="line-593"></a>-- parameter from left to right, and returns a final stream.
<a name="line-594"></a>--
<a name="line-595"></a>-- /Note/: Unlike the version over lists, this function does not
<a name="line-596"></a>-- return a final value for the accumulator, because the nature of
<a name="line-597"></a>-- streams precludes it.
<a name="line-598"></a>mapAccumL :: (a -> b -> (a,b)) -> a -> Stream b -> Stream b
<a name="line-599"></a>mapAccumL f z0 (Stream next0 s0 len) = Stream next (s0 :*: z0) len -- HINT depends on f
<a name="line-600"></a> where
<a name="line-601"></a> {-# INLINE next #-}
<a name="line-602"></a> next (s :*: z) = case next0 s of
<a name="line-603"></a> Yield x s' -> let (z',y) = f z x
<a name="line-604"></a> in Yield y (s' :*: z')
<a name="line-605"></a> Skip s' -> Skip (s' :*: z)
<a name="line-606"></a> Done -> Done
<a name="line-607"></a>{-# INLINE [0] mapAccumL #-}
<a name="line-608"></a>-}</span>
<a name="line-609"></a>
<a name="line-610"></a><span class='hs-comment'>-- -----------------------------------------------------------------------------</span>
<a name="line-611"></a><span class='hs-comment'>-- ** Generating and unfolding streams</span>
<a name="line-612"></a>
<a name="line-613"></a><a name="replicateCharI"></a><span class='hs-definition'>replicateCharI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-614"></a><span class='hs-definition'>replicateCharI</span> <span class='hs-varid'>n</span> <span class='hs-varid'>c</span>
<a name="line-615"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-616"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- HINT maybe too low</span>
<a name="line-617"></a> <span class='hs-keyword'>where</span>
<a name="line-618"></a> <span class='hs-varid'>next</span> <span class='hs-varid'>i</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-619"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>c</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-620"></a><span class='hs-comment'>{-# INLINE [0] replicateCharI #-}</span>
<a name="line-621"></a>
<a name="line-622"></a><a name="RI"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>RI</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>RI</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int64</span>
<a name="line-623"></a>
<a name="line-624"></a><a name="replicateI"></a><span class='hs-definition'>replicateI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int64</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-625"></a><span class='hs-definition'>replicateI</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-626"></a> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>RI</span> <span class='hs-varid'>s0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varop'>*</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-627"></a> <span class='hs-keyword'>where</span>
<a name="line-628"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>RI</span> <span class='hs-varid'>s</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-629"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>k</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-630"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-631"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>RI</span> <span class='hs-varid'>s0</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-632"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>RI</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-633"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>RI</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-634"></a><span class='hs-comment'>{-# INLINE [0] replicateI #-}</span>
<a name="line-635"></a>
<a name="line-636"></a><a name="unfoldr"></a><span class='hs-comment'>-- | /O(n)/, where @n@ is the length of the result. The unfoldr function</span>
<a name="line-637"></a><span class='hs-comment'>-- is analogous to the List 'unfoldr'. unfoldr builds a stream</span>
<a name="line-638"></a><span class='hs-comment'>-- from a seed value. The function takes the element and returns</span>
<a name="line-639"></a><span class='hs-comment'>-- Nothing if it is done producing the stream or returns Just</span>
<a name="line-640"></a><span class='hs-comment'>-- (a,b), in which case, a is the next Char in the string, and b is</span>
<a name="line-641"></a><span class='hs-comment'>-- the seed value for further production.</span>
<a name="line-642"></a><span class='hs-definition'>unfoldr</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span><span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-643"></a><span class='hs-definition'>unfoldr</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-num'>1</span> <span class='hs-comment'>-- HINT maybe too low</span>
<a name="line-644"></a> <span class='hs-keyword'>where</span>
<a name="line-645"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-646"></a> <span class='hs-varid'>next</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-647"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-648"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>w</span> <span class='hs-varid'>s'</span>
<a name="line-649"></a><span class='hs-comment'>{-# INLINE [0] unfoldr #-}</span>
<a name="line-650"></a>
<a name="line-651"></a><a name="unfoldrNI"></a><span class='hs-comment'>-- | /O(n)/ Like 'unfoldr', 'unfoldrNI' builds a stream from a seed</span>
<a name="line-652"></a><span class='hs-comment'>-- value. However, the length of the result is limited by the</span>
<a name="line-653"></a><span class='hs-comment'>-- first argument to 'unfoldrNI'. This function is more efficient than</span>
<a name="line-654"></a><span class='hs-comment'>-- 'unfoldr' when the length of the result is known.</span>
<a name="line-655"></a><span class='hs-definition'>unfoldrNI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-656"></a><span class='hs-definition'>unfoldrNI</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s0</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-657"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-varop'>*</span><span class='hs-num'>2</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- HINT maybe too high</span>
<a name="line-658"></a> <span class='hs-keyword'>where</span>
<a name="line-659"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-660"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>z</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>f</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-661"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-662"></a> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>w</span><span class='hs-layout'>,</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>z</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-663"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>z</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-664"></a><span class='hs-comment'>{-# INLINE unfoldrNI #-}</span>
<a name="line-665"></a>
<a name="line-666"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-667"></a><span class='hs-comment'>-- * Substreams</span>
<a name="line-668"></a>
<a name="line-669"></a><a name="take"></a><span class='hs-comment'>-- | /O(n)/ take n, applied to a stream, returns the prefix of the</span>
<a name="line-670"></a><span class='hs-comment'>-- stream of length @n@, or the stream itself if @n@ is greater than the</span>
<a name="line-671"></a><span class='hs-comment'>-- length of the stream.</span>
<a name="line-672"></a><span class='hs-definition'>take</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-673"></a><span class='hs-definition'>take</span> <span class='hs-varid'>n0</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-674"></a> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>n0</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>smaller</span> <span class='hs-varid'>len</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varid'>n0</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-675"></a> <span class='hs-keyword'>where</span>
<a name="line-676"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-677"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-678"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-679"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-680"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-681"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-682"></a><span class='hs-comment'>{-# INLINE [0] take #-}</span>
<a name="line-683"></a>
<a name="line-684"></a><a name="drop"></a><span class='hs-comment'>-- | /O(n)/ drop n, applied to a stream, returns the suffix of the</span>
<a name="line-685"></a><span class='hs-comment'>-- stream after the first @n@ characters, or the empty stream if @n@</span>
<a name="line-686"></a><span class='hs-comment'>-- is greater than the length of the stream.</span>
<a name="line-687"></a><span class='hs-definition'>drop</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-688"></a><span class='hs-definition'>drop</span> <span class='hs-varid'>n0</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-689"></a> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>J</span> <span class='hs-varid'>n0</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span> <span class='hs-comment'>-</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-num'>0</span> <span class='hs-varid'>n0</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-690"></a> <span class='hs-keyword'>where</span>
<a name="line-691"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-692"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>J</span> <span class='hs-varid'>n</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-693"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>N</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-694"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-695"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-696"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>J</span> <span class='hs-varid'>n</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-697"></a> <span class='hs-conid'>Yield</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>J</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-698"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>N</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-699"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-700"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>N</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-701"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>N</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-702"></a><span class='hs-comment'>{-# INLINE [0] drop #-}</span>
<a name="line-703"></a>
<a name="line-704"></a><a name="takeWhile"></a><span class='hs-comment'>-- | takeWhile, applied to a predicate @p@ and a stream, returns the</span>
<a name="line-705"></a><span class='hs-comment'>-- longest prefix (possibly empty) of elements that satisfy p.</span>
<a name="line-706"></a><span class='hs-definition'>takeWhile</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-707"></a><span class='hs-definition'>takeWhile</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span> <span class='hs-comment'>-- HINT maybe too high</span>
<a name="line-708"></a> <span class='hs-keyword'>where</span>
<a name="line-709"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-710"></a> <span class='hs-varid'>next</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-711"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-712"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span>
<a name="line-713"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-714"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-715"></a><span class='hs-comment'>{-# INLINE [0] takeWhile #-}</span>
<a name="line-716"></a>
<a name="line-717"></a><a name="dropWhile"></a><span class='hs-comment'>-- | dropWhile @p @xs returns the suffix remaining after takeWhile @p @xs.</span>
<a name="line-718"></a><span class='hs-definition'>dropWhile</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-719"></a><span class='hs-definition'>dropWhile</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s0</span><span class='hs-layout'>)</span> <span class='hs-varid'>len</span> <span class='hs-comment'>-- HINT maybe too high</span>
<a name="line-720"></a> <span class='hs-keyword'>where</span>
<a name="line-721"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-722"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-723"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-724"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-725"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>S1</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-726"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-727"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-728"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-729"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-730"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-conid'>S2</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>s'</span><span class='hs-layout'>)</span>
<a name="line-731"></a><span class='hs-comment'>{-# INLINE [0] dropWhile #-}</span>
<a name="line-732"></a>
<a name="line-733"></a><a name="isPrefixOf"></a><span class='hs-comment'>-- | /O(n)/ The 'isPrefixOf' function takes two 'Stream's and returns</span>
<a name="line-734"></a><span class='hs-comment'>-- 'True' iff the first is a prefix of the second.</span>
<a name="line-735"></a><span class='hs-definition'>isPrefixOf</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-736"></a><span class='hs-definition'>isPrefixOf</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next1</span> <span class='hs-varid'>s1</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next2</span> <span class='hs-varid'>s2</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>next1</span> <span class='hs-varid'>s1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>next2</span> <span class='hs-varid'>s2</span><span class='hs-layout'>)</span>
<a name="line-737"></a> <span class='hs-keyword'>where</span>
<a name="line-738"></a> <span class='hs-varid'>loop</span> <span class='hs-conid'>Done</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span>
<a name="line-739"></a> <span class='hs-varid'>loop</span> <span class='hs-keyword'>_</span> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-740"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-conid'>Skip</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Skip</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>next1</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>next2</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-741"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-conid'>Skip</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-varid'>x2</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>next1</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-varid'>x2</span>
<a name="line-742"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>x1</span> <span class='hs-layout'>(</span><span class='hs-conid'>Skip</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>x1</span> <span class='hs-layout'>(</span><span class='hs-varid'>next2</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-743"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-conid'>Yield</span> <span class='hs-varid'>x1</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Yield</span> <span class='hs-varid'>x2</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x1</span> <span class='hs-varop'>==</span> <span class='hs-varid'>x2</span> <span class='hs-varop'>&&</span>
<a name="line-744"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>next1</span> <span class='hs-varid'>s1'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>next2</span> <span class='hs-varid'>s2'</span><span class='hs-layout'>)</span>
<a name="line-745"></a><span class='hs-comment'>{-# INLINE [0] isPrefixOf #-}</span>
<a name="line-746"></a><span class='hs-comment'>{-# SPECIALISE isPrefixOf :: Stream Char -> Stream Char -> Bool #-}</span>
<a name="line-747"></a>
<a name="line-748"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-749"></a><span class='hs-comment'>-- * Searching</span>
<a name="line-750"></a>
<a name="line-751"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-752"></a><span class='hs-comment'>-- ** Searching by equality</span>
<a name="line-753"></a>
<a name="line-754"></a><a name="elem"></a><span class='hs-comment'>-- | /O(n)/ elem is the stream membership predicate.</span>
<a name="line-755"></a><span class='hs-definition'>elem</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-756"></a><span class='hs-definition'>elem</span> <span class='hs-varid'>w</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_elem</span> <span class='hs-varid'>s0</span>
<a name="line-757"></a> <span class='hs-keyword'>where</span>
<a name="line-758"></a> <span class='hs-varid'>loop_elem</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-759"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-760"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_elem</span> <span class='hs-varid'>s'</span>
<a name="line-761"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-762"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_elem</span> <span class='hs-varid'>s'</span>
<a name="line-763"></a><span class='hs-comment'>{-# INLINE [0] elem #-}</span>
<a name="line-764"></a>
<a name="line-765"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-766"></a><span class='hs-comment'>-- ** Searching with a predicate</span>
<a name="line-767"></a>
<a name="line-768"></a><span class='hs-comment'>-- | /O(n)/ The 'findBy' function takes a predicate and a stream,</span>
<a name="line-769"></a><span class='hs-comment'>-- and returns the first element in matching the predicate, or 'Nothing'</span>
<a name="line-770"></a><span class='hs-comment'>-- if there is no such element.</span>
<a name="line-771"></a>
<a name="line-772"></a><a name="findBy"></a><span class='hs-definition'>findBy</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Char</span>
<a name="line-773"></a><span class='hs-definition'>findBy</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_find</span> <span class='hs-varid'>s0</span>
<a name="line-774"></a> <span class='hs-keyword'>where</span>
<a name="line-775"></a> <span class='hs-varid'>loop_find</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-776"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-777"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_find</span> <span class='hs-varid'>s'</span>
<a name="line-778"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>x</span>
<a name="line-779"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_find</span> <span class='hs-varid'>s'</span>
<a name="line-780"></a><span class='hs-comment'>{-# INLINE [0] findBy #-}</span>
<a name="line-781"></a>
<a name="line-782"></a><a name="indexI"></a><span class='hs-comment'>-- | /O(n)/ Stream index (subscript) operator, starting from 0.</span>
<a name="line-783"></a><span class='hs-definition'>indexI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-784"></a><span class='hs-definition'>indexI</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-varid'>n0</span>
<a name="line-785"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n0</span> <span class='hs-varop'><</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>streamError</span> <span class='hs-str'>"index"</span> <span class='hs-str'>"Negative index"</span>
<a name="line-786"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_index</span> <span class='hs-varid'>n0</span> <span class='hs-varid'>s0</span>
<a name="line-787"></a> <span class='hs-keyword'>where</span>
<a name="line-788"></a> <span class='hs-varid'>loop_index</span> <span class='hs-varop'>!</span><span class='hs-varid'>n</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-789"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>streamError</span> <span class='hs-str'>"index"</span> <span class='hs-str'>"Index too large"</span>
<a name="line-790"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_index</span> <span class='hs-varid'>n</span> <span class='hs-varid'>s'</span>
<a name="line-791"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-792"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_index</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-793"></a><span class='hs-comment'>{-# INLINE [0] indexI #-}</span>
<a name="line-794"></a>
<a name="line-795"></a><a name="filter"></a><span class='hs-comment'>-- | /O(n)/ 'filter', applied to a predicate and a stream,</span>
<a name="line-796"></a><span class='hs-comment'>-- returns a stream containing those characters that satisfy the</span>
<a name="line-797"></a><span class='hs-comment'>-- predicate.</span>
<a name="line-798"></a><span class='hs-definition'>filter</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-799"></a><span class='hs-definition'>filter</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-varid'>len</span> <span class='hs-comment'>-- HINT maybe too high</span>
<a name="line-800"></a> <span class='hs-keyword'>where</span>
<a name="line-801"></a> <span class='hs-varid'>next</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-802"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-803"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span>
<a name="line-804"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-805"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span>
<a name="line-806"></a><span class='hs-comment'>{-# INLINE [0] filter #-}</span>
<a name="line-807"></a>
<a name="line-808"></a><span class='hs-comment'>{-# RULES
<a name="line-809"></a> "STREAM filter/filter fusion" forall p q s.
<a name="line-810"></a> filter p (filter q s) = filter (\x -> q x && p x) s
<a name="line-811"></a> #-}</span>
<a name="line-812"></a>
<a name="line-813"></a><a name="findIndexI"></a><span class='hs-comment'>-- | The 'findIndexI' function takes a predicate and a stream and</span>
<a name="line-814"></a><span class='hs-comment'>-- returns the index of the first element in the stream satisfying the</span>
<a name="line-815"></a><span class='hs-comment'>-- predicate.</span>
<a name="line-816"></a><span class='hs-definition'>findIndexI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span>
<a name="line-817"></a><span class='hs-definition'>findIndexI</span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>findIndicesI</span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-818"></a> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>i</span>
<a name="line-819"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-820"></a><span class='hs-comment'>{-# INLINE [0] findIndexI #-}</span>
<a name="line-821"></a>
<a name="line-822"></a><a name="findIndicesI"></a><span class='hs-comment'>-- | The 'findIndicesI' function takes a predicate and a stream and</span>
<a name="line-823"></a><span class='hs-comment'>-- returns all indices of the elements in the stream satisfying the</span>
<a name="line-824"></a><span class='hs-comment'>-- predicate.</span>
<a name="line-825"></a><span class='hs-definition'>findIndicesI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-826"></a><span class='hs-definition'>findIndicesI</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop_findIndex</span> <span class='hs-num'>0</span> <span class='hs-varid'>s0</span>
<a name="line-827"></a> <span class='hs-keyword'>where</span>
<a name="line-828"></a> <span class='hs-varid'>loop_findIndex</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-829"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-830"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_findIndex</span> <span class='hs-varid'>i</span> <span class='hs-varid'>s'</span> <span class='hs-comment'>-- hmm. not caught by QC</span>
<a name="line-831"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>p</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>i</span> <span class='hs-conop'>:</span> <span class='hs-varid'>loop_findIndex</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-832"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop_findIndex</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-833"></a><span class='hs-comment'>{-# INLINE [0] findIndicesI #-}</span>
<a name="line-834"></a>
<a name="line-835"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-836"></a><span class='hs-comment'>-- * Zipping</span>
<a name="line-837"></a>
<a name="line-838"></a><a name="zipWith"></a><span class='hs-comment'>-- | zipWith generalises 'zip' by zipping with the function given as</span>
<a name="line-839"></a><span class='hs-comment'>-- the first argument, instead of a tupling function.</span>
<a name="line-840"></a><span class='hs-definition'>zipWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-varid'>b</span>
<a name="line-841"></a><span class='hs-definition'>zipWith</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>sa0</span> <span class='hs-varid'>len1</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next1</span> <span class='hs-varid'>sb0</span> <span class='hs-varid'>len2</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-842"></a> <span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>sa0</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>sb0</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>N</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>smaller</span> <span class='hs-varid'>len1</span> <span class='hs-varid'>len2</span><span class='hs-layout'>)</span>
<a name="line-843"></a> <span class='hs-keyword'>where</span>
<a name="line-844"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>sa</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>sb</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>N</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next0</span> <span class='hs-varid'>sa</span> <span class='hs-keyword'>of</span>
<a name="line-845"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-846"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>sa'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-varid'>sa'</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>sb</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>N</span><span class='hs-layout'>)</span>
<a name="line-847"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>a</span> <span class='hs-varid'>sa'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-varid'>sa'</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>sb</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>J</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-848"></a>
<a name="line-849"></a> <span class='hs-varid'>next</span> <span class='hs-layout'>(</span><span class='hs-varid'>sa'</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>sb</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>J</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next1</span> <span class='hs-varid'>sb</span> <span class='hs-keyword'>of</span>
<a name="line-850"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-851"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>sb'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Skip</span> <span class='hs-layout'>(</span><span class='hs-varid'>sa'</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>sb'</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>J</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-852"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>b</span> <span class='hs-varid'>sb'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Yield</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>sa'</span> <span class='hs-conop'>:*:</span> <span class='hs-varid'>sb'</span> <span class='hs-conop'>:*:</span> <span class='hs-conid'>N</span><span class='hs-layout'>)</span>
<a name="line-853"></a><span class='hs-comment'>{-# INLINE [0] zipWith #-}</span>
<a name="line-854"></a>
<a name="line-855"></a><a name="countCharI"></a><span class='hs-comment'>-- | /O(n)/ The 'countCharI' function returns the number of times the</span>
<a name="line-856"></a><span class='hs-comment'>-- query element appears in the given stream.</span>
<a name="line-857"></a><span class='hs-definition'>countCharI</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-858"></a><span class='hs-definition'>countCharI</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-sel'>_len</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-num'>0</span> <span class='hs-varid'>s0</span>
<a name="line-859"></a> <span class='hs-keyword'>where</span>
<a name="line-860"></a> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-861"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>i</span>
<a name="line-862"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>i</span> <span class='hs-varid'>s'</span>
<a name="line-863"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>a</span> <span class='hs-varop'>==</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>s'</span>
<a name="line-864"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>i</span> <span class='hs-varid'>s'</span>
<a name="line-865"></a><span class='hs-comment'>{-# INLINE [0] countCharI #-}</span>
<a name="line-866"></a>
<a name="line-867"></a><a name="streamError"></a><span class='hs-definition'>streamError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-868"></a><span class='hs-definition'>streamError</span> <span class='hs-varid'>func</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"Data.Text.Fusion.Common."</span> <span class='hs-varop'>++</span> <span class='hs-varid'>func</span> <span class='hs-varop'>++</span> <span class='hs-str'>": "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>msg</span>
<a name="line-869"></a>
<a name="line-870"></a><a name="emptyError"></a><span class='hs-definition'>emptyError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-871"></a><span class='hs-definition'>emptyError</span> <span class='hs-varid'>func</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>internalError</span> <span class='hs-varid'>func</span> <span class='hs-str'>"Empty input"</span>
<a name="line-872"></a>
<a name="line-873"></a><a name="internalError"></a><span class='hs-definition'>internalError</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-874"></a><span class='hs-definition'>internalError</span> <span class='hs-varid'>func</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>streamError</span> <span class='hs-varid'>func</span> <span class='hs-str'>"Internal error"</span>
</pre></body>
</html>
