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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE CPP #-}</span>
<a name="line-2"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-missing-methods #-}</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Data.Text.Fusion.Internal</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) Roman Leshchinskiy 2008,</span>
<a name="line-6"></a><span class='hs-comment'>-- (c) Bryan O'Sullivan 2009</span>
<a name="line-7"></a><span class='hs-comment'>--</span>
<a name="line-8"></a><span class='hs-comment'>-- License : BSD-style</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : bos@serpentine.com, rtomharper@googlemail.com,</span>
<a name="line-10"></a><span class='hs-comment'>-- duncan@haskell.org</span>
<a name="line-11"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-12"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-- Size hints.</span>
<a name="line-15"></a>
<a name="line-16"></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'>Size</span>
<a name="line-17"></a> <span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-conid'>Size</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>exactly</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>exactSize</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>maxSize</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unknownSize</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>smaller</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>larger</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>upperBound</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isEmpty</span>
<a name="line-27"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-28"></a>
<a name="line-29"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-30"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Exception</span> <span class='hs-layout'>(</span><span class='hs-varid'>assert</span><span class='hs-layout'>)</span>
<a name="line-31"></a><span class='hs-cpp'>#endif</span>
<a name="line-32"></a>
<a name="line-33"></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-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Exact size.</span>
<a name="line-34"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Max</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-comment'>-- ^ Upper bound on size.</span>
<a name="line-35"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Unknown</span> <span class='hs-comment'>-- ^ Unknown size.</span>
<a name="line-36"></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-37"></a>
<a name="line-38"></a><a name="exactly"></a><span class='hs-definition'>exactly</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-39"></a><span class='hs-definition'>exactly</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-40"></a><span class='hs-definition'>exactly</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-41"></a><span class='hs-comment'>{-# INLINE exactly #-}</span>
<a name="line-42"></a>
<a name="line-43"></a><a name="exactSize"></a><span class='hs-definition'>exactSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Size</span>
<a name="line-44"></a><span class='hs-definition'>exactSize</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span>
<a name="line-45"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-46"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-47"></a><span class='hs-cpp'>#endif</span>
<a name="line-48"></a> <span class='hs-conid'>Exact</span> <span class='hs-varid'>n</span>
<a name="line-49"></a><span class='hs-comment'>{-# INLINE exactSize #-}</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="maxSize"></a><span class='hs-definition'>maxSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Size</span>
<a name="line-52"></a><span class='hs-definition'>maxSize</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span>
<a name="line-53"></a><span class='hs-cpp'>#if defined(ASSERTS)</span>
<a name="line-54"></a> <span class='hs-varid'>assert</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-varop'>>=</span> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-55"></a><span class='hs-cpp'>#endif</span>
<a name="line-56"></a> <span class='hs-conid'>Max</span> <span class='hs-varid'>n</span>
<a name="line-57"></a><span class='hs-comment'>{-# INLINE maxSize #-}</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="unknownSize"></a><span class='hs-definition'>unknownSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Size</span>
<a name="line-60"></a><span class='hs-definition'>unknownSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Unknown</span>
<a name="line-61"></a><span class='hs-comment'>{-# INLINE unknownSize #-}</span>
<a name="line-62"></a>
<a name="line-63"></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-64"></a> <span class='hs-layout'>(</span><span class='hs-varop'>+</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>addSize</span>
<a name="line-65"></a> <span class='hs-layout'>(</span><span class='hs-comment'>-</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>subtractSize</span>
<a name="line-66"></a> <span class='hs-layout'>(</span><span class='hs-varop'>*</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mulSize</span>
<a name="line-67"></a>
<a name="line-68"></a> <span class='hs-varid'>fromInteger</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-keyword'>where</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Exact</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromInteger</span>
<a name="line-69"></a> <span class='hs-comment'>{-# INLINE f #-}</span>
<a name="line-70"></a>
<a name="line-71"></a><a name="addSize"></a><span class='hs-definition'>addSize</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-72"></a><span class='hs-definition'>addSize</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'>m</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-73"></a><span class='hs-definition'>addSize</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'>m</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-74"></a><span class='hs-definition'>addSize</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'>m</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-75"></a><span class='hs-definition'>addSize</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'>m</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-76"></a><span class='hs-definition'>addSize</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-77"></a><span class='hs-comment'>{-# INLINE addSize #-}</span>
<a name="line-78"></a>
<a name="line-79"></a><a name="subtractSize"></a><span class='hs-definition'>subtractSize</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-80"></a><span class='hs-definition'>subtractSize</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'>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> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-81"></a><span class='hs-definition'>subtractSize</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-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Max</span> <span class='hs-varid'>m</span>
<a name="line-82"></a><span class='hs-definition'>subtractSize</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'>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> <span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-83"></a><span class='hs-definition'>subtractSize</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-84"></a><span class='hs-definition'>subtractSize</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-conid'>Unknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-85"></a><span class='hs-definition'>subtractSize</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-86"></a><span class='hs-comment'>{-# INLINE subtractSize #-}</span>
<a name="line-87"></a>
<a name="line-88"></a><a name="mulSize"></a><span class='hs-definition'>mulSize</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-89"></a><span class='hs-definition'>mulSize</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'>m</span><span class='hs-varop'>*</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-90"></a><span class='hs-definition'>mulSize</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'>m</span><span class='hs-varop'>*</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-91"></a><span class='hs-definition'>mulSize</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'>m</span><span class='hs-varop'>*</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-92"></a><span class='hs-definition'>mulSize</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'>m</span><span class='hs-varop'>*</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-93"></a><span class='hs-definition'>mulSize</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-94"></a><span class='hs-comment'>{-# INLINE mulSize #-}</span>
<a name="line-95"></a>
<a name="line-96"></a><a name="smaller"></a><span class='hs-comment'>-- | Minimum of two size hints.</span>
<a name="line-97"></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-98"></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'>m</span> <span class='hs-varop'>`min`</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-99"></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'>m</span> <span class='hs-varop'>`min`</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-100"></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-101"></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'>m</span> <span class='hs-varop'>`min`</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-102"></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'>m</span> <span class='hs-varop'>`min`</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-103"></a><span class='hs-definition'>smaller</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Max</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-conid'>Unknown</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-104"></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-105"></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-106"></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-107"></a><span class='hs-comment'>{-# INLINE smaller #-}</span>
<a name="line-108"></a>
<a name="line-109"></a><a name="larger"></a><span class='hs-comment'>-- | Maximum of two size hints.</span>
<a name="line-110"></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-111"></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'>m</span> <span class='hs-varop'>`max`</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-112"></a><span class='hs-definition'>larger</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</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-varid'>b</span><span class='hs-keyglyph'>@</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-varid'>a</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-varid'>b</span>
<a name="line-114"></a><span class='hs-definition'>larger</span> <span class='hs-varid'>a</span><span class='hs-keyglyph'>@</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-varid'>b</span><span class='hs-keyglyph'>@</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-varid'>b</span>
<a name="line-115"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-116"></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'>m</span> <span class='hs-varop'>`max`</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-117"></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-118"></a><span class='hs-comment'>{-# INLINE larger #-}</span>
<a name="line-119"></a>
<a name="line-120"></a><a name="upperBound"></a><span class='hs-comment'>-- | Compute the maximum size from a size hint, if possible.</span>
<a name="line-121"></a><span class='hs-definition'>upperBound</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</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-122"></a><span class='hs-definition'>upperBound</span> <span class='hs-keyword'>_</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-123"></a><span class='hs-definition'>upperBound</span> <span class='hs-keyword'>_</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'>n</span>
<a name="line-124"></a><span class='hs-definition'>upperBound</span> <span class='hs-varid'>k</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span>
<a name="line-125"></a><span class='hs-comment'>{-# INLINE upperBound #-}</span>
<a name="line-126"></a>
<a name="line-127"></a><a name="isEmpty"></a><span class='hs-definition'>isEmpty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Size</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-128"></a><span class='hs-definition'>isEmpty</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-num'>0</span>
<a name="line-129"></a><span class='hs-definition'>isEmpty</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'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span>
<a name="line-130"></a><span class='hs-definition'>isEmpty</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span>
<a name="line-131"></a><span class='hs-comment'>{-# INLINE isEmpty #-}</span>
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