<?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.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, MagicHash #-}</span>
<a name="line-2"></a>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Data.Text.Fusion</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Tom Harper 2008-2009,</span>
<a name="line-6"></a><span class='hs-comment'>-- (c) Bryan O'Sullivan 2009-2010,</span>
<a name="line-7"></a><span class='hs-comment'>-- (c) Duncan Coutts 2009</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-10"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com, rtomharper@googlemail.com,</span>
<a name="line-11"></a><span class='hs-comment'>-- duncan@haskell.org</span>
<a name="line-12"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-13"></a><span class='hs-comment'>-- Portability : GHC</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-- Text manipulation functions represented as fusible operations over</span>
<a name="line-16"></a><span class='hs-comment'>-- streams.</span>
<a name="line-17"></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>
<a name="line-18"></a> <span class='hs-layout'>(</span>
<a name="line-19"></a> <span class='hs-comment'>-- * Types</span>
<a name="line-20"></a> <span class='hs-conid'>Stream</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Step</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span>
<a name="line-22"></a>
<a name="line-23"></a> <span class='hs-comment'>-- * Creation and elimination</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>stream</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unstream</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>reverseStream</span>
<a name="line-27"></a>
<a name="line-28"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>length</span>
<a name="line-29"></a>
<a name="line-30"></a> <span class='hs-comment'>-- * Transformations</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>reverse</span>
<a name="line-32"></a>
<a name="line-33"></a> <span class='hs-comment'>-- * Construction</span>
<a name="line-34"></a> <span class='hs-comment'>-- ** Scans</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>reverseScanr</span>
<a name="line-36"></a>
<a name="line-37"></a> <span class='hs-comment'>-- ** Accumulating maps</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>mapAccumL</span>
<a name="line-39"></a>
<a name="line-40"></a> <span class='hs-comment'>-- ** Generation and unfolding</span>
<a name="line-41"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unfoldrN</span>
<a name="line-42"></a>
<a name="line-43"></a> <span class='hs-comment'>-- * Indexing</span>
<a name="line-44"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>index</span>
<a name="line-45"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>findIndex</span>
<a name="line-46"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>countChar</span>
<a name="line-47"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-48"></a>
<a name="line-49"></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'>Maybe</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'>Monad</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>
<a name="line-50"></a> <span class='hs-conid'>Num</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'>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-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-51"></a> <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-52"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Bits</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-53"></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'>Internal</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-54"></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'>UnsafeChar</span> <span class='hs-layout'>(</span><span class='hs-varid'>ord</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafeChr</span><span class='hs-layout'>,</span> <span class='hs-varid'>unsafeWrite</span><span class='hs-layout'>)</span>
<a name="line-55"></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'>UnsafeShift</span> <span class='hs-layout'>(</span><span class='hs-varid'>shiftL</span><span class='hs-layout'>,</span> <span class='hs-varid'>shiftR</span><span class='hs-layout'>)</span>
<a name="line-56"></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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Array</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>A</span>
<a name="line-57"></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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Common</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-58"></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-59"></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-60"></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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>I</span>
<a name="line-61"></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'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Encoding</span><span class='hs-varop'>.</span><span class='hs-conid'>Utf16</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>U16</span>
<a name="line-62"></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-63"></a>
<a name="line-64"></a><span class='hs-keyword'>default</span><span class='hs-layout'>(</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="stream"></a><span class='hs-comment'>-- | /O(n)/ Convert a 'Text' into a 'Stream Char'.</span>
<a name="line-67"></a><span class='hs-definition'>stream</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-68"></a><span class='hs-definition'>stream</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</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'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>maxSize</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-69"></a> <span class='hs-keyword'>where</span>
<a name="line-70"></a> <span class='hs-varop'>!</span><span class='hs-varid'>end</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>off</span><span class='hs-varop'>+</span><span class='hs-varid'>len</span>
<a name="line-71"></a> <span class='hs-varid'>next</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span>
<a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>end</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-73"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0xD800</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0xDBFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-layout'>(</span><span class='hs-conid'>U16</span><span class='hs-varop'>.</span><span class='hs-varid'>chr2</span> <span class='hs-varid'>n</span> <span class='hs-varid'>n2</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-74"></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-layout'>(</span><span class='hs-varid'>unsafeChr</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</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-75"></a> <span class='hs-keyword'>where</span>
<a name="line-76"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>i</span>
<a name="line-77"></a> <span class='hs-varid'>n2</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</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-78"></a><span class='hs-comment'>{-# INLINE [0] stream #-}</span>
<a name="line-79"></a>
<a name="line-80"></a><a name="reverseStream"></a><span class='hs-comment'>-- | /O(n)/ Convert a 'Text' into a 'Stream Char', but iterate</span>
<a name="line-81"></a><span class='hs-comment'>-- backwards.</span>
<a name="line-82"></a><span class='hs-definition'>reverseStream</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Stream</span> <span class='hs-conid'>Char</span>
<a name="line-83"></a><span class='hs-definition'>reverseStream</span> <span class='hs-layout'>(</span><span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</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-varid'>off</span><span class='hs-varop'>+</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><span class='hs-varid'>maxSize</span> <span class='hs-varid'>len</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-keyword'>where</span>
<a name="line-85"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-86"></a> <span class='hs-varid'>next</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span>
<a name="line-87"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>i</span> <span class='hs-varop'><</span> <span class='hs-varid'>off</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Done</span>
<a name="line-88"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0xDC00</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0xDFFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Yield</span> <span class='hs-layout'>(</span><span class='hs-conid'>U16</span><span class='hs-varop'>.</span><span class='hs-varid'>chr2</span> <span class='hs-varid'>n2</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-comment'>-</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-89"></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-layout'>(</span><span class='hs-varid'>unsafeChr</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-90"></a> <span class='hs-keyword'>where</span>
<a name="line-91"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>i</span>
<a name="line-92"></a> <span class='hs-varid'>n2</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeIndex</span> <span class='hs-varid'>arr</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-93"></a><span class='hs-comment'>{-# INLINE [0] reverseStream #-}</span>
<a name="line-94"></a>
<a name="line-95"></a><a name="unstream"></a><span class='hs-comment'>-- | /O(n)/ Convert a 'Stream Char' into a 'Text'.</span>
<a name="line-96"></a><span class='hs-definition'>unstream</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'>Text</span>
<a name="line-97"></a><span class='hs-definition'>unstream</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'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>textP</span> <span class='hs-layout'>(</span><span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>fst</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span> <span class='hs-layout'>(</span><span class='hs-conid'>P</span><span class='hs-varop'>.</span><span class='hs-varid'>snd</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-98"></a> <span class='hs-keyword'>where</span>
<a name="line-99"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>run2</span> <span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeNew</span> <span class='hs-varid'>mlen</span> <span class='hs-varop'>>>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>arr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>outer</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>mlen</span> <span class='hs-varid'>s0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-100"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>mlen</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>upperBound</span> <span class='hs-num'>4</span> <span class='hs-varid'>len</span>
<a name="line-101"></a> <span class='hs-varid'>outer</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>top</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span>
<a name="line-102"></a> <span class='hs-keyword'>where</span>
<a name="line-103"></a> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>s</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span>
<a name="line-104"></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-105"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>arr</span><span class='hs-layout'>,</span> <span class='hs-varid'>i</span><span class='hs-layout'>)</span>
<a name="line-106"></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'>s'</span> <span class='hs-varid'>i</span>
<a name="line-107"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-108"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>j</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>top</span> <span class='hs-keyglyph'>-></span> <span class='hs-comment'>{-# SCC "unstream/resize" #-}</span> <span class='hs-keyword'>do</span>
<a name="line-109"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>top'</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>top</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>`shiftL`</span> <span class='hs-num'>1</span>
<a name="line-110"></a> <span class='hs-varid'>arr'</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeNew</span> <span class='hs-varid'>top'</span>
<a name="line-111"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>copyM</span> <span class='hs-varid'>arr'</span> <span class='hs-num'>0</span> <span class='hs-varid'>arr</span> <span class='hs-num'>0</span> <span class='hs-varid'>top</span>
<a name="line-112"></a> <span class='hs-varid'>outer</span> <span class='hs-varid'>arr'</span> <span class='hs-varid'>top'</span> <span class='hs-varid'>s</span> <span class='hs-varid'>i</span>
<a name="line-113"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>i</span> <span class='hs-varid'>x</span>
<a name="line-114"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>s'</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-115"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ord</span> <span class='hs-varid'>x</span> <span class='hs-varop'><</span> <span class='hs-num'>0x10000</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span>
<a name="line-116"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-117"></a><span class='hs-comment'>{-# INLINE [0] unstream #-}</span>
<a name="line-118"></a><span class='hs-comment'>{-# RULES "STREAM stream/unstream fusion" forall s. stream (unstream s) = s #-}</span>
<a name="line-119"></a>
<a name="line-120"></a>
<a name="line-121"></a><span class='hs-comment'>-- ----------------------------------------------------------------------------</span>
<a name="line-122"></a><span class='hs-comment'>-- * Basic stream functions</span>
<a name="line-123"></a>
<a name="line-124"></a><a name="length"></a><span class='hs-definition'>length</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'>Int</span>
<a name="line-125"></a><span class='hs-definition'>length</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>lengthI</span>
<a name="line-126"></a><span class='hs-comment'>{-# INLINE[0] length #-}</span>
<a name="line-127"></a>
<a name="line-128"></a><a name="reverse"></a><span class='hs-comment'>-- | /O(n)/ Reverse the characters of a string.</span>
<a name="line-129"></a><span class='hs-definition'>reverse</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'>Text</span>
<a name="line-130"></a><span class='hs-definition'>reverse</span> <span class='hs-layout'>(</span><span class='hs-conid'>Stream</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s</span> <span class='hs-varid'>len0</span><span class='hs-layout'>)</span>
<a name="line-131"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isEmpty</span> <span class='hs-varid'>len0</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>empty</span>
<a name="line-132"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>textP</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off'</span> <span class='hs-varid'>len'</span>
<a name="line-133"></a> <span class='hs-keyword'>where</span>
<a name="line-134"></a> <span class='hs-varid'>len0'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>upperBound</span> <span class='hs-num'>4</span> <span class='hs-layout'>(</span><span class='hs-varid'>larger</span> <span class='hs-varid'>len0</span> <span class='hs-num'>4</span><span class='hs-layout'>)</span>
<a name="line-135"></a> <span class='hs-layout'>(</span><span class='hs-varid'>arr</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>off'</span><span class='hs-layout'>,</span> <span class='hs-varid'>len'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>run2</span> <span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeNew</span> <span class='hs-varid'>len0'</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-varid'>len0'</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>len0'</span><span class='hs-layout'>)</span>
<a name="line-136"></a> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>s0</span> <span class='hs-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-varop'>!</span><span class='hs-varid'>len</span> <span class='hs-varid'>marr</span> <span class='hs-keyglyph'>=</span>
<a name="line-137"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>next</span> <span class='hs-varid'>s0</span> <span class='hs-keyword'>of</span>
<a name="line-138"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>marr</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-layout'>,</span> <span class='hs-varid'>len</span><span class='hs-comment'>-</span><span class='hs-varid'>j</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-139"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-140"></a> <span class='hs-conid'>Skip</span> <span class='hs-varid'>s1</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>loop</span> <span class='hs-varid'>s1</span> <span class='hs-varid'>i</span> <span class='hs-varid'>len</span> <span class='hs-varid'>marr</span>
<a name="line-141"></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-varid'>i</span> <span class='hs-varop'><</span> <span class='hs-varid'>least</span> <span class='hs-keyglyph'>-></span> <span class='hs-comment'>{-# SCC "reverse/resize" #-}</span> <span class='hs-keyword'>do</span>
<a name="line-142"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>newLen</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>len</span> <span class='hs-varop'>`shiftL`</span> <span class='hs-num'>1</span>
<a name="line-143"></a> <span class='hs-varid'>marr'</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeNew</span> <span class='hs-varid'>newLen</span>
<a name="line-144"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>copyM</span> <span class='hs-varid'>marr'</span> <span class='hs-layout'>(</span><span class='hs-varid'>newLen</span><span class='hs-comment'>-</span><span class='hs-varid'>len</span><span class='hs-layout'>)</span> <span class='hs-varid'>marr</span> <span class='hs-num'>0</span> <span class='hs-varid'>len</span>
<a name="line-145"></a> <span class='hs-varid'>write</span> <span class='hs-varid'>s1</span> <span class='hs-layout'>(</span><span class='hs-varid'>len</span><span class='hs-varop'>+</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span> <span class='hs-varid'>newLen</span> <span class='hs-varid'>marr'</span>
<a name="line-146"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>write</span> <span class='hs-varid'>s1</span> <span class='hs-varid'>i</span> <span class='hs-varid'>len</span> <span class='hs-varid'>marr</span>
<a name="line-147"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ord</span> <span class='hs-varid'>x</span>
<a name="line-148"></a> <span class='hs-varid'>least</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0x10000</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-149"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1</span>
<a name="line-150"></a> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-num'>0x10000</span>
<a name="line-151"></a> <span class='hs-varid'>lo</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varop'>`shiftR`</span> <span class='hs-num'>10</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-num'>0xD800</span>
<a name="line-152"></a> <span class='hs-varid'>hi</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromIntegral</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varop'>.&.</span> <span class='hs-num'>0x3FF</span><span class='hs-layout'>)</span> <span class='hs-varop'>+</span> <span class='hs-num'>0xDC00</span>
<a name="line-153"></a> <span class='hs-varid'>write</span> <span class='hs-varid'>t</span> <span class='hs-varid'>j</span> <span class='hs-varid'>l</span> <span class='hs-varid'>mar</span>
<a name="line-154"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0x10000</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-155"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>mar</span> <span class='hs-varid'>j</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-156"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span> <span class='hs-varid'>mar</span>
<a name="line-157"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-158"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>mar</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>lo</span>
<a name="line-159"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>mar</span> <span class='hs-varid'>j</span> <span class='hs-varid'>hi</span>
<a name="line-160"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-varid'>j</span><span class='hs-comment'>-</span><span class='hs-num'>2</span><span class='hs-layout'>)</span> <span class='hs-varid'>l</span> <span class='hs-varid'>mar</span>
<a name="line-161"></a><span class='hs-comment'>{-# INLINE [0] reverse #-}</span>
<a name="line-162"></a>
<a name="line-163"></a><a name="reverseScanr"></a><span class='hs-comment'>-- | /O(n)/ Perform the equivalent of 'scanr' over a list, only with</span>
<a name="line-164"></a><span class='hs-comment'>-- the input and result reversed.</span>
<a name="line-165"></a><span class='hs-definition'>reverseScanr</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-166"></a><span class='hs-definition'>reverseScanr</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-167"></a> <span class='hs-keyword'>where</span>
<a name="line-168"></a> <span class='hs-comment'>{-# INLINE next #-}</span>
<a name="line-169"></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-170"></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-171"></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'>x</span> <span class='hs-varid'>z</span>
<a name="line-172"></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-173"></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-174"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Done</span>
<a name="line-175"></a><span class='hs-comment'>{-# INLINE reverseScanr #-}</span>
<a name="line-176"></a>
<a name="line-177"></a><a name="unfoldrN"></a><span class='hs-comment'>-- | /O(n)/ Like 'unfoldr', 'unfoldrN' builds a stream from a seed</span>
<a name="line-178"></a><span class='hs-comment'>-- value. However, the length of the result is limited by the</span>
<a name="line-179"></a><span class='hs-comment'>-- first argument to 'unfoldrN'. This function is more efficient than</span>
<a name="line-180"></a><span class='hs-comment'>-- 'unfoldr' when the length of the result is known.</span>
<a name="line-181"></a><span class='hs-definition'>unfoldrN</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</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-182"></a><span class='hs-definition'>unfoldrN</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>unfoldrNI</span> <span class='hs-varid'>n</span>
<a name="line-183"></a><span class='hs-comment'>{-# INLINE [0] unfoldrN #-}</span>
<a name="line-184"></a>
<a name="line-185"></a><span class='hs-comment'>-------------------------------------------------------------------------------</span>
<a name="line-186"></a><span class='hs-comment'>-- ** Indexing streams</span>
<a name="line-187"></a>
<a name="line-188"></a><a name="index"></a><span class='hs-comment'>-- | /O(n)/ stream index (subscript) operator, starting from 0.</span>
<a name="line-189"></a><span class='hs-definition'>index</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'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Char</span>
<a name="line-190"></a><span class='hs-definition'>index</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>indexI</span>
<a name="line-191"></a><span class='hs-comment'>{-# INLINE [0] index #-}</span>
<a name="line-192"></a>
<a name="line-193"></a><a name="findIndex"></a><span class='hs-comment'>-- | The 'findIndex' function takes a predicate and a stream and</span>
<a name="line-194"></a><span class='hs-comment'>-- returns the index of the first element in the stream</span>
<a name="line-195"></a><span class='hs-comment'>-- satisfying the predicate.</span>
<a name="line-196"></a><span class='hs-definition'>findIndex</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'>Int</span>
<a name="line-197"></a><span class='hs-definition'>findIndex</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>findIndexI</span>
<a name="line-198"></a><span class='hs-comment'>{-# INLINE [0] findIndex #-}</span>
<a name="line-199"></a>
<a name="line-200"></a><a name="countChar"></a><span class='hs-comment'>-- | /O(n)/ The 'count' function returns the number of times the query</span>
<a name="line-201"></a><span class='hs-comment'>-- element appears in the given stream.</span>
<a name="line-202"></a><span class='hs-definition'>countChar</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'>Int</span>
<a name="line-203"></a><span class='hs-definition'>countChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>countCharI</span>
<a name="line-204"></a><span class='hs-comment'>{-# INLINE [0] countChar #-}</span>
<a name="line-205"></a>
<a name="line-206"></a><a name="mapAccumL"></a><span class='hs-comment'>-- | /O(n)/ Like a combination of 'map' and 'foldl''. Applies a</span>
<a name="line-207"></a><span class='hs-comment'>-- function to each element of a 'Text', passing an accumulating</span>
<a name="line-208"></a><span class='hs-comment'>-- parameter from left to right, and returns a final 'Text'.</span>
<a name="line-209"></a><span class='hs-definition'>mapAccumL</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'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-conid'>Char</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> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Text</span><span class='hs-layout'>)</span>
<a name="line-210"></a><span class='hs-definition'>mapAccumL</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-layout'>(</span><span class='hs-varid'>nz</span><span class='hs-layout'>,</span><span class='hs-conid'>I</span><span class='hs-varop'>.</span><span class='hs-varid'>textP</span> <span class='hs-varid'>na</span> <span class='hs-num'>0</span> <span class='hs-varid'>nl</span><span class='hs-layout'>)</span>
<a name="line-211"></a> <span class='hs-keyword'>where</span>
<a name="line-212"></a> <span class='hs-layout'>(</span><span class='hs-varid'>na</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>nz</span><span class='hs-layout'>,</span><span class='hs-varid'>nl</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>run2</span> <span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeNew</span> <span class='hs-varid'>mlen</span> <span class='hs-varop'>>>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>arr</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>outer</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>mlen</span> <span class='hs-varid'>z0</span> <span class='hs-varid'>s0</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-213"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>mlen</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>upperBound</span> <span class='hs-num'>4</span> <span class='hs-varid'>len</span>
<a name="line-214"></a> <span class='hs-varid'>outer</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>top</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span>
<a name="line-215"></a> <span class='hs-keyword'>where</span>
<a name="line-216"></a> <span class='hs-varid'>loop</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-varop'>!</span><span class='hs-varid'>i</span> <span class='hs-keyglyph'>=</span>
<a name="line-217"></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-218"></a> <span class='hs-conid'>Done</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>arr</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>z</span><span class='hs-layout'>,</span><span class='hs-varid'>i</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-219"></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> <span class='hs-varid'>i</span>
<a name="line-220"></a> <span class='hs-conid'>Yield</span> <span class='hs-varid'>x</span> <span class='hs-varid'>s'</span>
<a name="line-221"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>j</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>top</span> <span class='hs-keyglyph'>-></span> <span class='hs-comment'>{-# SCC "mapAccumL/resize" #-}</span> <span class='hs-keyword'>do</span>
<a name="line-222"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>top'</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>top</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>`shiftL`</span> <span class='hs-num'>1</span>
<a name="line-223"></a> <span class='hs-varid'>arr'</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeNew</span> <span class='hs-varid'>top'</span>
<a name="line-224"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>copyM</span> <span class='hs-varid'>arr'</span> <span class='hs-num'>0</span> <span class='hs-varid'>arr</span> <span class='hs-num'>0</span> <span class='hs-varid'>top</span>
<a name="line-225"></a> <span class='hs-varid'>outer</span> <span class='hs-varid'>arr'</span> <span class='hs-varid'>top'</span> <span class='hs-varid'>z</span> <span class='hs-varid'>s</span> <span class='hs-varid'>i</span>
<a name="line-226"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>z'</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</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-227"></a> <span class='hs-varid'>d</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>i</span> <span class='hs-varid'>c</span>
<a name="line-228"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>z'</span> <span class='hs-varid'>s'</span> <span class='hs-layout'>(</span><span class='hs-varid'>i</span><span class='hs-varop'>+</span><span class='hs-varid'>d</span><span class='hs-layout'>)</span>
<a name="line-229"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>j</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>ord</span> <span class='hs-varid'>x</span> <span class='hs-varop'><</span> <span class='hs-num'>0x10000</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span>
<a name="line-230"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>i</span> <span class='hs-varop'>+</span> <span class='hs-num'>1</span>
<a name="line-231"></a><span class='hs-comment'>{-# INLINE [0] mapAccumL #-}</span>
</pre></body>
</html>
