<?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://code.haskell.org/~malcolm/hscolour/ --> <title>Data/Vector/Fusion/Stream/Size.hs</title> <link type='text/css' rel='stylesheet' href='hscolour.css' /> </head> <body> <pre><a name="line-1"></a><span class='hs-cpp'>#</span><span class='hs-keyword'>if</span> <span class='hs-sel'>__GLASGOW_HASKELL__</span> <span class='hs-varop'>>=</span> <span class='hs-num'>703</span> <a name="line-2"></a><span class='hs-comment'>{-# LANGUAGE Safe #-}</span> <a name="line-3"></a><span class='hs-cpp'>#elif __GLASGOW_HASKELL__ >= 701</span> <a name="line-4"></a><span class='hs-comment'>{-# LANGUAGE Trustworthy #-}</span> <a name="line-5"></a><span class='hs-cpp'>#endif</span> <a name="line-6"></a><span class='hs-comment'>-- |</span> <a name="line-7"></a><span class='hs-comment'>-- Module : Data.Vector.Fusion.Stream.Size</span> <a name="line-8"></a><span class='hs-comment'>-- Copyright : (c) Roman Leshchinskiy 2008-2010</span> <a name="line-9"></a><span class='hs-comment'>-- License : BSD-style</span> <a name="line-10"></a><span class='hs-comment'>--</span> <a name="line-11"></a><span class='hs-comment'>-- Maintainer : Roman Leshchinskiy <rl@cse.unsw.edu.au></span> <a name="line-12"></a><span class='hs-comment'>-- Stability : experimental</span> <a name="line-13"></a><span class='hs-comment'>-- Portability : portable</span> <a name="line-14"></a><span class='hs-comment'>-- </span> <a name="line-15"></a><span class='hs-comment'>-- Size hints for streams.</span> <a name="line-16"></a><span class='hs-comment'>--</span> <a name="line-17"></a> <a name="line-18"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Stream</span><span class='hs-varop'>.</span><span class='hs-conid'>Size</span> <span class='hs-layout'>(</span> <a name="line-19"></a> <span class='hs-conid'>Size</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>smaller</span><span class='hs-layout'>,</span> <span class='hs-varid'>larger</span><span class='hs-layout'>,</span> <span class='hs-varid'>toMax</span><span class='hs-layout'>,</span> <span class='hs-varid'>upperBound</span> <a name="line-20"></a><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <a name="line-21"></a> <a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Vector</span><span class='hs-varop'>.</span><span class='hs-conid'>Fusion</span><span class='hs-varop'>.</span><span class='hs-conid'>Util</span> <span class='hs-layout'>(</span> <span class='hs-varid'>delay_inline</span> <span class='hs-layout'>)</span> <a name="line-23"></a> <a name="line-24"></a><a name="Size"></a><span class='hs-comment'>-- | Size hint</span> <a name="line-25"></a><a name="Size"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Exact size</span> <a name="line-26"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Max</span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Upper bound on the size</span> <a name="line-27"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Unknown</span> <span class='hs-comment'>-- ^ Unknown size</span> <a name="line-28"></a> <span class='hs-keyword'>deriving</span><span class='hs-layout'>(</span> <span class='hs-conid'>Eq</span><span class='hs-layout'>,</span> <span class='hs-conid'>Show</span> <span class='hs-layout'>)</span> <a name="line-29"></a> <a name="line-30"></a><a name="instance%20Num%20Size"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Num</span> <span class='hs-conid'>Size</span> <span class='hs-keyword'>where</span> <a name="line-31"></a> <span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span> <span class='hs-varop'>+</span> <span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-32"></a> <span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span> <span class='hs-varop'>+</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-33"></a> <a name="line-34"></a> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <span class='hs-varop'>+</span> <span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-35"></a> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <span class='hs-varop'>+</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-36"></a> <a name="line-37"></a> <span class='hs-keyword'>_</span> <span class='hs-varop'>+</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Unknown</span> <a name="line-38"></a> <a name="line-39"></a> <a name="line-40"></a> <span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span> <span class='hs-comment'>-</span> <span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-41"></a> <span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span> <span class='hs-comment'>-</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <a name="line-42"></a> <a name="line-43"></a> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <span class='hs-comment'>-</span> <span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-44"></a> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <span class='hs-comment'>-</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <a name="line-45"></a> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <span class='hs-comment'>-</span> <span class='hs-conid'>Unknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <a name="line-46"></a> <a name="line-47"></a> <span class='hs-keyword'>_</span> <span class='hs-comment'>-</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Unknown</span> <a name="line-48"></a> <a name="line-49"></a> <a name="line-50"></a> <span class='hs-varid'>fromInteger</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromInteger</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-51"></a> <a name="line-52"></a><a name="smaller"></a><span class='hs-comment'>-- | Minimum of two size hints</span> <a name="line-53"></a><span class='hs-definition'>smaller</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Size</span> <a name="line-54"></a><span class='hs-comment'>{-# INLINE smaller #-}</span> <a name="line-55"></a><span class='hs-definition'>smaller</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-layout'>(</span><span class='hs-varid'>delay_inline</span> <span class='hs-varid'>min</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-56"></a><span class='hs-definition'>smaller</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-layout'>(</span><span class='hs-varid'>delay_inline</span> <span class='hs-varid'>min</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-57"></a><span class='hs-definition'>smaller</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-conid'>Unknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <a name="line-58"></a><span class='hs-definition'>smaller</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-layout'>(</span><span class='hs-varid'>delay_inline</span> <span class='hs-varid'>min</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-59"></a><span class='hs-definition'>smaller</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-layout'>(</span><span class='hs-varid'>delay_inline</span> <span class='hs-varid'>min</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-60"></a><span class='hs-definition'>smaller</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-conid'>Unknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <a name="line-61"></a><span class='hs-definition'>smaller</span> <span class='hs-conid'>Unknown</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <a name="line-62"></a><span class='hs-definition'>smaller</span> <span class='hs-conid'>Unknown</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <a name="line-63"></a><span class='hs-definition'>smaller</span> <span class='hs-conid'>Unknown</span> <span class='hs-conid'>Unknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Unknown</span> <a name="line-64"></a> <a name="line-65"></a><a name="larger"></a><span class='hs-comment'>-- | Maximum of two size hints</span> <a name="line-66"></a><span class='hs-definition'>larger</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Size</span> <a name="line-67"></a><span class='hs-comment'>{-# INLINE larger #-}</span> <a name="line-68"></a><span class='hs-definition'>larger</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-layout'>(</span><span class='hs-varid'>delay_inline</span> <span class='hs-varid'>max</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-69"></a><span class='hs-definition'>larger</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>m</span> <span class='hs-varop'>>=</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-varid'>m</span> <a name="line-70"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <a name="line-71"></a><span class='hs-definition'>larger</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>n</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-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span> <a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span> <a name="line-73"></a><span class='hs-definition'>larger</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-layout'>(</span><span class='hs-varid'>delay_inline</span> <span class='hs-varid'>max</span> <span class='hs-varid'>m</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <a name="line-74"></a><span class='hs-definition'>larger</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Unknown</span> <a name="line-75"></a> <a name="line-76"></a><a name="toMax"></a><span class='hs-comment'>-- | Convert a size hint to an upper bound</span> <a name="line-77"></a><span class='hs-definition'>toMax</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Size</span> <a name="line-78"></a><span class='hs-definition'>toMax</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <a name="line-79"></a><span class='hs-definition'>toMax</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span> <a name="line-80"></a><span class='hs-definition'>toMax</span> <span class='hs-conid'>Unknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Unknown</span> <a name="line-81"></a> <a name="line-82"></a><a name="lowerBound"></a><span class='hs-comment'>-- | Compute the minimum size from a size hint</span> <a name="line-83"></a><span class='hs-definition'>lowerBound</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <a name="line-84"></a><span class='hs-definition'>lowerBound</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span> <a name="line-85"></a><span class='hs-definition'>lowerBound</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span> <a name="line-86"></a> <a name="line-87"></a><a name="upperBound"></a><span class='hs-comment'>-- | Compute the maximum size from a size hint if possible</span> <a name="line-88"></a><span class='hs-definition'>upperBound</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-conid'>Int</span> <a name="line-89"></a><span class='hs-definition'>upperBound</span> <span class='hs-layout'>(</span><span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>n</span> <a name="line-90"></a><span class='hs-definition'>upperBound</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varid'>n</span> <a name="line-91"></a><span class='hs-definition'>upperBound</span> <span class='hs-conid'>Unknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span> <a name="line-92"></a> </pre></body> </html>