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<title>Data/Text/Lazy/Builder.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# LANGUAGE BangPatterns, CPP, Rank2Types #-}</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'>-- |</span>
<a name="line-5"></a><span class='hs-comment'>-- Module : Data.Text.Lazy.Builder</span>
<a name="line-6"></a><span class='hs-comment'>-- Copyright : (c) 2010 Johan Tibell</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD3-style (see LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>-- </span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : Johan Tibell <johan.tibell@gmail.com></span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : portable to Hugs and GHC</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- Efficient construction of lazy @Text@ values. The principal</span>
<a name="line-14"></a><span class='hs-comment'>-- operations on a @Builder@ are @singleton@, @fromText@, and</span>
<a name="line-15"></a><span class='hs-comment'>-- @fromLazyText@, which construct new builders, and 'mappend', which</span>
<a name="line-16"></a><span class='hs-comment'>-- concatenates two builders.</span>
<a name="line-17"></a><span class='hs-comment'>--</span>
<a name="line-18"></a><span class='hs-comment'>-- To get maximum performance when building lazy @Text@ values using a builder, associate @mappend@ calls to the right. For example, prefer</span>
<a name="line-19"></a><span class='hs-comment'>--</span>
<a name="line-20"></a><span class='hs-comment'>-- > singleton 'a' `mappend` (singleton 'b' `mappend` singleton 'c')</span>
<a name="line-21"></a><span class='hs-comment'>--</span>
<a name="line-22"></a><span class='hs-comment'>-- to</span>
<a name="line-23"></a><span class='hs-comment'>--</span>
<a name="line-24"></a><span class='hs-comment'>-- > singleton 'a' `mappend` singleton 'b' `mappend` singleton 'c'</span>
<a name="line-25"></a><span class='hs-comment'>--</span>
<a name="line-26"></a><span class='hs-comment'>-- as the latter associates @mappend@ to the left.</span>
<a name="line-27"></a><span class='hs-comment'>--</span>
<a name="line-28"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-29"></a>
<a name="line-30"></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'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Builder</span>
<a name="line-31"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * The Builder type</span>
<a name="line-32"></a> <span class='hs-conid'>Builder</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toLazyText</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toLazyTextWith</span>
<a name="line-35"></a>
<a name="line-36"></a> <span class='hs-comment'>-- * Constructing Builders</span>
<a name="line-37"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>singleton</span>
<a name="line-38"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromText</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromLazyText</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>fromString</span>
<a name="line-41"></a>
<a name="line-42"></a> <span class='hs-comment'>-- * Flushing the buffer state</span>
<a name="line-43"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>flush</span>
<a name="line-44"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-45"></a>
<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-varop'>.</span><span class='hs-conid'>ST</span> <span class='hs-layout'>(</span><span class='hs-conid'>ST</span><span class='hs-layout'>,</span> <span class='hs-varid'>runST</span><span class='hs-layout'>)</span>
<a name="line-47"></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-48"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monoid</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-49"></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-50"></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'>Lazy</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-varid'>smallChunkSize</span><span class='hs-layout'>)</span>
<a name="line-51"></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'>Unsafe</span> <span class='hs-layout'>(</span><span class='hs-varid'>inlineInterleaveST</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'>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'>unsafeWrite</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'>UnsafeShift</span> <span class='hs-layout'>(</span><span class='hs-varid'>shiftR</span><span class='hs-layout'>)</span>
<a name="line-54"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Prelude</span> <span class='hs-varid'>hiding</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span><span class='hs-layout'>,</span> <span class='hs-varid'>putChar</span><span class='hs-layout'>)</span>
<a name="line-55"></a>
<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'>String</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>String</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-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-58"></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-59"></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'>Lazy</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>L</span>
<a name="line-60"></a>
<a name="line-61"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-62"></a>
<a name="line-63"></a><a name="Builder"></a><span class='hs-comment'>-- | A @Builder@ is an efficient way to build lazy @Text@ values.</span>
<a name="line-64"></a><a name="Builder"></a><span class='hs-comment'>-- There are several functions for constructing builders, but only one</span>
<a name="line-65"></a><a name="Builder"></a><span class='hs-comment'>-- to inspect them: to extract any data, you have to turn them into</span>
<a name="line-66"></a><a name="Builder"></a><span class='hs-comment'>-- lazy @Text@ values using @toLazyText@.</span>
<a name="line-67"></a><a name="Builder"></a><span class='hs-comment'>--</span>
<a name="line-68"></a><a name="Builder"></a><span class='hs-comment'>-- Internally, a builder constructs a lazy @Text@ by filling arrays</span>
<a name="line-69"></a><a name="Builder"></a><span class='hs-comment'>-- piece by piece. As each buffer is filled, it is \'popped\' off, to</span>
<a name="line-70"></a><a name="Builder"></a><span class='hs-comment'>-- become a new chunk of the resulting lazy @Text@. All this is</span>
<a name="line-71"></a><a name="Builder"></a><span class='hs-comment'>-- hidden from the user of the @Builder@.</span>
<a name="line-72"></a><a name="Builder"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Builder</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-layout'>{</span>
<a name="line-73"></a> <span class='hs-comment'>-- Invariant (from Data.Text.Lazy):</span>
<a name="line-74"></a> <span class='hs-comment'>-- The lists include no null Texts.</span>
<a name="line-75"></a> <span class='hs-varid'>runBuilder</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>s</span><span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-76"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Buffer</span> <span class='hs-varid'>s</span>
<a name="line-77"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span>
<a name="line-78"></a> <span class='hs-layout'>}</span>
<a name="line-79"></a>
<a name="line-80"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-conid'>Builder</span> <span class='hs-keyword'>where</span>
<a name="line-81"></a> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-82"></a> <span class='hs-comment'>{-# INLINE mempty #-}</span>
<a name="line-83"></a> <span class='hs-varid'>mappend</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>append</span>
<a name="line-84"></a> <span class='hs-comment'>{-# INLINE mappend #-}</span>
<a name="line-85"></a> <span class='hs-varid'>mconcat</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>foldr</span> <span class='hs-varid'>mappend</span> <span class='hs-varid'>mempty</span>
<a name="line-86"></a> <span class='hs-comment'>{-# INLINE mconcat #-}</span>
<a name="line-87"></a>
<a name="line-88"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>String</span><span class='hs-varop'>.</span><span class='hs-conid'>IsString</span> <span class='hs-conid'>Builder</span> <span class='hs-keyword'>where</span>
<a name="line-89"></a> <span class='hs-varid'>fromString</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fromString</span>
<a name="line-90"></a> <span class='hs-comment'>{-# INLINE fromString #-}</span>
<a name="line-91"></a>
<a name="line-92"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Show</span> <span class='hs-conid'>Builder</span> <span class='hs-keyword'>where</span>
<a name="line-93"></a> <span class='hs-varid'>show</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>show</span> <span class='hs-varop'>.</span> <span class='hs-varid'>toLazyText</span>
<a name="line-94"></a>
<a name="line-95"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Eq</span> <span class='hs-conid'>Builder</span> <span class='hs-keyword'>where</span>
<a name="line-96"></a> <span class='hs-varid'>a</span> <span class='hs-varop'>==</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toLazyText</span> <span class='hs-varid'>a</span> <span class='hs-varop'>==</span> <span class='hs-varid'>toLazyText</span> <span class='hs-varid'>b</span>
<a name="line-97"></a>
<a name="line-98"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Ord</span> <span class='hs-conid'>Builder</span> <span class='hs-keyword'>where</span>
<a name="line-99"></a> <span class='hs-varid'>a</span> <span class='hs-varop'><=</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toLazyText</span> <span class='hs-varid'>a</span> <span class='hs-varop'><=</span> <span class='hs-varid'>toLazyText</span> <span class='hs-varid'>b</span>
<a name="line-100"></a>
<a name="line-101"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="empty"></a><span class='hs-comment'>-- | /O(1)./ The empty @Builder@, satisfying</span>
<a name="line-104"></a><span class='hs-comment'>--</span>
<a name="line-105"></a><span class='hs-comment'>-- * @'toLazyText' 'empty' = 'L.empty'@</span>
<a name="line-106"></a><span class='hs-comment'>--</span>
<a name="line-107"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Builder</span>
<a name="line-108"></a><span class='hs-definition'>empty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>k</span> <span class='hs-varid'>buf</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>k</span> <span class='hs-varid'>buf</span><span class='hs-layout'>)</span>
<a name="line-109"></a><span class='hs-comment'>{-# INLINE empty #-}</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="singleton"></a><span class='hs-comment'>-- | /O(1)./ A @Builder@ taking a single character, satisfying</span>
<a name="line-112"></a><span class='hs-comment'>--</span>
<a name="line-113"></a><span class='hs-comment'>-- * @'toLazyText' ('singleton' c) = 'L.singleton' c@</span>
<a name="line-114"></a><span class='hs-comment'>--</span>
<a name="line-115"></a><span class='hs-definition'>singleton</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-116"></a><span class='hs-definition'>singleton</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeAtMost</span> <span class='hs-num'>2</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>-></span>
<a name="line-117"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span> <span class='hs-varop'><</span> <span class='hs-num'>0x10000</span>
<a name="line-118"></a> <span class='hs-keyword'>then</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>o</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-num'>1</span>
<a name="line-119"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-120"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>o</span> <span class='hs-varid'>lo</span>
<a name="line-121"></a> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>marr</span> <span class='hs-layout'>(</span><span class='hs-varid'>o</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>hi</span>
<a name="line-122"></a> <span class='hs-varid'>return</span> <span class='hs-num'>2</span>
<a name="line-123"></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'>c</span>
<a name="line-124"></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-125"></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-126"></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-127"></a><span class='hs-comment'>{-# INLINE singleton #-}</span>
<a name="line-128"></a>
<a name="line-129"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-130"></a>
<a name="line-131"></a><a name="append"></a><span class='hs-comment'>-- | /O(1)./ The concatenation of two builders, an associative</span>
<a name="line-132"></a><span class='hs-comment'>-- operation with identity 'empty', satisfying</span>
<a name="line-133"></a><span class='hs-comment'>--</span>
<a name="line-134"></a><span class='hs-comment'>-- * @'toLazyText' ('append' x y) = 'L.append' ('toLazyText' x) ('toLazyText' y)@</span>
<a name="line-135"></a><span class='hs-comment'>--</span>
<a name="line-136"></a><span class='hs-definition'>append</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Builder</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-137"></a><span class='hs-definition'>append</span> <span class='hs-layout'>(</span><span class='hs-conid'>Builder</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Builder</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span>
<a name="line-138"></a><span class='hs-comment'>{-# INLINE [0] append #-}</span>
<a name="line-139"></a>
<a name="line-140"></a><a name="copyLimit"></a><span class='hs-comment'>-- TODO: Experiment to find the right threshold.</span>
<a name="line-141"></a><span class='hs-definition'>copyLimit</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-142"></a><span class='hs-definition'>copyLimit</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>128</span>
<a name="line-143"></a>
<a name="line-144"></a><span class='hs-comment'>-- This function attempts to merge small @Text@ values instead of</span>
<a name="line-145"></a><span class='hs-comment'>-- treating each value as its own chunk. We may not always want this.</span>
<a name="line-146"></a>
<a name="line-147"></a><a name="fromText"></a><span class='hs-comment'>-- | /O(1)./ A @Builder@ taking a 'S.Text', satisfying</span>
<a name="line-148"></a><span class='hs-comment'>--</span>
<a name="line-149"></a><span class='hs-comment'>-- * @'toLazyText' ('fromText' t) = 'L.fromChunks' [t]@</span>
<a name="line-150"></a><span class='hs-comment'>--</span>
<a name="line-151"></a><span class='hs-definition'>fromText</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-152"></a><span class='hs-definition'>fromText</span> <span class='hs-varid'>t</span><span class='hs-keyglyph'>@</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'>l</span><span class='hs-layout'>)</span>
<a name="line-153"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>null</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>empty</span>
<a name="line-154"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l</span> <span class='hs-varop'><=</span> <span class='hs-varid'>copyLimit</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeN</span> <span class='hs-varid'>l</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>marr</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>copyI</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>o</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>off</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-varop'>+</span><span class='hs-varid'>o</span><span class='hs-layout'>)</span>
<a name="line-155"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flush</span> <span class='hs-varop'>`append`</span> <span class='hs-varid'>mapBuilder</span> <span class='hs-layout'>(</span><span class='hs-varid'>t</span> <span class='hs-conop'>:</span><span class='hs-layout'>)</span>
<a name="line-156"></a><span class='hs-comment'>{-# INLINE [1] fromText #-}</span>
<a name="line-157"></a>
<a name="line-158"></a><span class='hs-comment'>{-# RULES
<a name="line-159"></a>"fromText/pack" forall s .
<a name="line-160"></a> fromText (S.pack s) = fromString s
<a name="line-161"></a> #-}</span>
<a name="line-162"></a>
<a name="line-163"></a><a name="fromString"></a><span class='hs-comment'>-- | /O(1)./ A Builder taking a @String@, satisfying</span>
<a name="line-164"></a><span class='hs-comment'>--</span>
<a name="line-165"></a><span class='hs-comment'>-- * @'toLazyText' ('fromString' s) = 'L.fromChunks' [S.pack s]@</span>
<a name="line-166"></a><span class='hs-comment'>--</span>
<a name="line-167"></a><span class='hs-definition'>fromString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-168"></a><span class='hs-definition'>fromString</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-varid'>p0</span> <span class='hs-varid'>o0</span> <span class='hs-varid'>u0</span> <span class='hs-varid'>l0</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-169"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loop</span> <span class='hs-varop'>!</span><span class='hs-varid'>marr</span> <span class='hs-varop'>!</span><span class='hs-varid'>o</span> <span class='hs-varop'>!</span><span class='hs-varid'>u</span> <span class='hs-varop'>!</span><span class='hs-varid'>l</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>o</span> <span class='hs-varid'>u</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span>
<a name="line-170"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>o</span> <span class='hs-varid'>u</span> <span class='hs-varid'>l</span> <span class='hs-varid'>s</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-171"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>l</span> <span class='hs-varop'><=</span> <span class='hs-num'>1</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-172"></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'>unsafeFreeze</span> <span class='hs-varid'>marr</span>
<a name="line-173"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>o</span> <span class='hs-varid'>u</span>
<a name="line-174"></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'>new</span> <span class='hs-varid'>chunkSize</span>
<a name="line-175"></a> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>inlineInterleaveST</span> <span class='hs-layout'>(</span><span class='hs-varid'>loop</span> <span class='hs-varid'>marr'</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>chunkSize</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-176"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>t</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ts</span>
<a name="line-177"></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-178"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>unsafeWrite</span> <span class='hs-varid'>marr</span> <span class='hs-layout'>(</span><span class='hs-varid'>o</span><span class='hs-varop'>+</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-varid'>c</span>
<a name="line-179"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>marr</span> <span class='hs-varid'>o</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span>
<a name="line-180"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>loop</span> <span class='hs-varid'>p0</span> <span class='hs-varid'>o0</span> <span class='hs-varid'>u0</span> <span class='hs-varid'>l0</span> <span class='hs-varid'>str</span>
<a name="line-181"></a> <span class='hs-keyword'>where</span>
<a name="line-182"></a> <span class='hs-varid'>chunkSize</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>smallChunkSize</span>
<a name="line-183"></a><span class='hs-comment'>{-# INLINE fromString #-}</span>
<a name="line-184"></a>
<a name="line-185"></a><a name="fromLazyText"></a><span class='hs-comment'>-- | /O(1)./ A @Builder@ taking a lazy @Text@, satisfying</span>
<a name="line-186"></a><span class='hs-comment'>--</span>
<a name="line-187"></a><span class='hs-comment'>-- * @'toLazyText' ('fromLazyText' t) = t@</span>
<a name="line-188"></a><span class='hs-comment'>--</span>
<a name="line-189"></a><span class='hs-definition'>fromLazyText</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-190"></a><span class='hs-definition'>fromLazyText</span> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>flush</span> <span class='hs-varop'>`append`</span> <span class='hs-varid'>mapBuilder</span> <span class='hs-layout'>(</span><span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>toChunks</span> <span class='hs-varid'>ts</span> <span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-191"></a><span class='hs-comment'>{-# INLINE fromLazyText #-}</span>
<a name="line-192"></a>
<a name="line-193"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-194"></a>
<a name="line-195"></a><a name="Buffer"></a><span class='hs-comment'>-- Our internal buffer type</span>
<a name="line-196"></a><a name="Buffer"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Buffer</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Buffer</span> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>MArray</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-197"></a> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-comment'>-- offset</span>
<a name="line-198"></a> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-comment'>-- used units</span>
<a name="line-199"></a> <span class='hs-comment'>{-# UNPACK #-}</span> <span class='hs-varop'>!</span><span class='hs-conid'>Int</span> <span class='hs-comment'>-- length left</span>
<a name="line-200"></a>
<a name="line-201"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-202"></a>
<a name="line-203"></a><a name="toLazyText"></a><span class='hs-comment'>-- | /O(n)./ Extract a lazy @Text@ from a @Builder@ with a default</span>
<a name="line-204"></a><span class='hs-comment'>-- buffer size. The construction work takes place if and when the</span>
<a name="line-205"></a><span class='hs-comment'>-- relevant part of the lazy @Text@ is demanded.</span>
<a name="line-206"></a><span class='hs-definition'>toLazyText</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Builder</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-207"></a><span class='hs-definition'>toLazyText</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toLazyTextWith</span> <span class='hs-varid'>smallChunkSize</span>
<a name="line-208"></a>
<a name="line-209"></a><a name="toLazyTextWith"></a><span class='hs-comment'>-- | /O(n)./ Extract a lazy @Text@ from a @Builder@, using the given</span>
<a name="line-210"></a><span class='hs-comment'>-- size for the initial buffer. The construction work takes place if</span>
<a name="line-211"></a><span class='hs-comment'>-- and when the relevant part of the lazy @Text@ is demanded.</span>
<a name="line-212"></a><span class='hs-comment'>--</span>
<a name="line-213"></a><span class='hs-comment'>-- If the initial buffer is too small to hold all data, subsequent</span>
<a name="line-214"></a><span class='hs-comment'>-- buffers will be the default buffer size.</span>
<a name="line-215"></a><span class='hs-definition'>toLazyTextWith</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span>
<a name="line-216"></a><span class='hs-definition'>toLazyTextWith</span> <span class='hs-varid'>chunkSize</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>L</span><span class='hs-varop'>.</span><span class='hs-varid'>fromChunks</span> <span class='hs-layout'>(</span><span class='hs-varid'>runST</span> <span class='hs-varop'>$</span>
<a name="line-217"></a> <span class='hs-varid'>newBuffer</span> <span class='hs-varid'>chunkSize</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>runBuilder</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-varop'>`append`</span> <span class='hs-varid'>flush</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-218"></a>
<a name="line-219"></a><a name="flush"></a><span class='hs-comment'>-- | /O(1)./ Pop the strict @Text@ we have constructed so far, if any,</span>
<a name="line-220"></a><span class='hs-comment'>-- yielding a new chunk in the result lazy @Text@.</span>
<a name="line-221"></a><span class='hs-definition'>flush</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Builder</span>
<a name="line-222"></a><span class='hs-definition'>flush</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>k</span> <span class='hs-varid'>buf</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-varid'>p</span> <span class='hs-varid'>o</span> <span class='hs-varid'>u</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-223"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>u</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span>
<a name="line-224"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>k</span> <span class='hs-varid'>buf</span>
<a name="line-225"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <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'>unsafeFreeze</span> <span class='hs-varid'>p</span>
<a name="line-226"></a> <span class='hs-keyword'>let</span> <span class='hs-varop'>!</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Buffer</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>o</span><span class='hs-varop'>+</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span> <span class='hs-num'>0</span> <span class='hs-varid'>l</span>
<a name="line-227"></a> <span class='hs-varop'>!</span><span class='hs-varid'>t</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Text</span> <span class='hs-varid'>arr</span> <span class='hs-varid'>o</span> <span class='hs-varid'>u</span>
<a name="line-228"></a> <span class='hs-varid'>ts</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>inlineInterleaveST</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-229"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>t</span> <span class='hs-conop'>:</span> <span class='hs-varid'>ts</span>
<a name="line-230"></a>
<a name="line-231"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-232"></a>
<a name="line-233"></a><a name="withBuffer"></a><span class='hs-comment'>-- | Sequence an ST operation on the buffer</span>
<a name="line-234"></a><span class='hs-definition'>withBuffer</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>s</span><span class='hs-varop'>.</span> <span class='hs-conid'>Buffer</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-235"></a><span class='hs-definition'>withBuffer</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>k</span> <span class='hs-varid'>buf</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>buf</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span>
<a name="line-236"></a><span class='hs-comment'>{-# INLINE withBuffer #-}</span>
<a name="line-237"></a>
<a name="line-238"></a><a name="withSize"></a><span class='hs-comment'>-- | Get the size of the buffer</span>
<a name="line-239"></a><span class='hs-definition'>withSize</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-240"></a><span class='hs-definition'>withSize</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>k</span> <span class='hs-varid'>buf</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-241"></a> <span class='hs-varid'>runBuilder</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-varid'>k</span> <span class='hs-varid'>buf</span>
<a name="line-242"></a><span class='hs-comment'>{-# INLINE withSize #-}</span>
<a name="line-243"></a>
<a name="line-244"></a><a name="mapBuilder"></a><span class='hs-comment'>-- | Map the resulting list of texts.</span>
<a name="line-245"></a><span class='hs-definition'>mapBuilder</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-conid'>Text</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-246"></a><span class='hs-definition'>mapBuilder</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span><span class='hs-layout'>)</span>
<a name="line-247"></a>
<a name="line-248"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-249"></a>
<a name="line-250"></a><a name="ensureFree"></a><span class='hs-comment'>-- | Ensure that there are at least @n@ many elements available.</span>
<a name="line-251"></a><span class='hs-definition'>ensureFree</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-252"></a><a name="!"></a><span class='hs-definition'>ensureFree</span> <span class='hs-varop'>!</span><span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>withSize</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span>
<a name="line-253"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-varid'>l</span>
<a name="line-254"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>empty</span>
<a name="line-255"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>flush</span> <span class='hs-varop'>`append'`</span> <span class='hs-varid'>withBuffer</span> <span class='hs-layout'>(</span><span class='hs-varid'>const</span> <span class='hs-layout'>(</span><span class='hs-varid'>newBuffer</span> <span class='hs-layout'>(</span><span class='hs-varid'>max</span> <span class='hs-varid'>n</span> <span class='hs-varid'>smallChunkSize</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-256"></a><span class='hs-comment'>{-# INLINE [0] ensureFree #-}</span>
<a name="line-257"></a>
<a name="line-258"></a><a name="writeAtMost"></a><span class='hs-definition'>writeAtMost</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-keyword'>forall</span> <span class='hs-varid'>s</span><span class='hs-varop'>.</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>MArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-259"></a><span class='hs-definition'>writeAtMost</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>ensureFree</span> <span class='hs-varid'>n</span> <span class='hs-varop'>`append'`</span> <span class='hs-varid'>withBuffer</span> <span class='hs-layout'>(</span><span class='hs-varid'>writeBuffer</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span>
<a name="line-260"></a><span class='hs-comment'>{-# INLINE [0] writeAtMost #-}</span>
<a name="line-261"></a>
<a name="line-262"></a><a name="writeN"></a><span class='hs-comment'>-- | Ensure that @n@ many elements are available, and then use @f@ to</span>
<a name="line-263"></a><span class='hs-comment'>-- write some elements into the memory.</span>
<a name="line-264"></a><span class='hs-definition'>writeN</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-keyword'>forall</span> <span class='hs-varid'>s</span><span class='hs-varop'>.</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>MArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-265"></a><span class='hs-definition'>writeN</span> <span class='hs-varid'>n</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>writeAtMost</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-varid'>p</span> <span class='hs-varid'>o</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>p</span> <span class='hs-varid'>o</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-266"></a><span class='hs-comment'>{-# INLINE writeN #-}</span>
<a name="line-267"></a>
<a name="line-268"></a><a name="writeBuffer"></a><span class='hs-definition'>writeBuffer</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-conid'>MArray</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Buffer</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-269"></a><span class='hs-definition'>writeBuffer</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-varid'>p</span> <span class='hs-varid'>o</span> <span class='hs-varid'>u</span> <span class='hs-varid'>l</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-270"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>f</span> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>o</span><span class='hs-varop'>+</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span>
<a name="line-271"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$!</span> <span class='hs-conid'>Buffer</span> <span class='hs-varid'>p</span> <span class='hs-varid'>o</span> <span class='hs-layout'>(</span><span class='hs-varid'>u</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-comment'>-</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-272"></a><span class='hs-comment'>{-# INLINE writeBuffer #-}</span>
<a name="line-273"></a>
<a name="line-274"></a><a name="newBuffer"></a><span class='hs-definition'>newBuffer</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ST</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-conid'>Buffer</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-275"></a><span class='hs-definition'>newBuffer</span> <span class='hs-varid'>size</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-276"></a> <span class='hs-varid'>arr</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>A</span><span class='hs-varop'>.</span><span class='hs-varid'>new</span> <span class='hs-varid'>size</span>
<a name="line-277"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$!</span> <span class='hs-conid'>Buffer</span> <span class='hs-varid'>arr</span> <span class='hs-num'>0</span> <span class='hs-num'>0</span> <span class='hs-varid'>size</span>
<a name="line-278"></a><span class='hs-comment'>{-# INLINE newBuffer #-}</span>
<a name="line-279"></a>
<a name="line-280"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-281"></a><span class='hs-comment'>-- Some nice rules for Builder</span>
<a name="line-282"></a>
<a name="line-283"></a><a name="append'"></a><span class='hs-comment'>-- This function makes GHC understand that 'writeN' and 'ensureFree'</span>
<a name="line-284"></a><span class='hs-comment'>-- are *not* recursive in the precense of the rewrite rules below.</span>
<a name="line-285"></a><span class='hs-comment'>-- This is not needed with GHC 7+.</span>
<a name="line-286"></a><span class='hs-definition'>append'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Builder</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Builder</span>
<a name="line-287"></a><span class='hs-definition'>append'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Builder</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Builder</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Builder</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-varid'>g</span><span class='hs-layout'>)</span>
<a name="line-288"></a><span class='hs-comment'>{-# INLINE append' #-}</span>
<a name="line-289"></a>
<a name="line-290"></a><span class='hs-comment'>{-# RULES
<a name="line-291"></a>
<a name="line-292"></a>"append/writeAtMost" forall a b (f::forall s. A.MArray s -> Int -> ST s Int)
<a name="line-293"></a> (g::forall s. A.MArray s -> Int -> ST s Int) ws.
<a name="line-294"></a> append (writeAtMost a f) (append (writeAtMost b g) ws) =
<a name="line-295"></a> append (writeAtMost (a+b) (\marr o -> f marr o >>= \ n ->
<a name="line-296"></a> g marr (o+n) >>= \ m ->
<a name="line-297"></a> let s = n+m in s `seq` return s)) ws
<a name="line-298"></a>
<a name="line-299"></a>"writeAtMost/writeAtMost" forall a b (f::forall s. A.MArray s -> Int -> ST s Int)
<a name="line-300"></a> (g::forall s. A.MArray s -> Int -> ST s Int).
<a name="line-301"></a> append (writeAtMost a f) (writeAtMost b g) =
<a name="line-302"></a> writeAtMost (a+b) (\marr o -> f marr o >>= \ n ->
<a name="line-303"></a> g marr (o+n) >>= \ m ->
<a name="line-304"></a> let s = n+m in s `seq` return s)
<a name="line-305"></a>
<a name="line-306"></a>"ensureFree/ensureFree" forall a b .
<a name="line-307"></a> append (ensureFree a) (ensureFree b) = ensureFree (max a b)
<a name="line-308"></a>
<a name="line-309"></a>"flush/flush"
<a name="line-310"></a> append flush flush = flush
<a name="line-311"></a>
<a name="line-312"></a> #-}</span>
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