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<pre><a name="line-1"></a><span class='hs-comment'>{-| Element-agnostic parsing utilities for @pipes@
<a name="line-2"></a>
<a name="line-3"></a> See "Pipes.Parse.Tutorial" for an extended tutorial
<a name="line-4"></a>-}</span>
<a name="line-5"></a>
<a name="line-6"></a><span class='hs-comment'>{-# LANGUAGE RankNTypes #-}</span>
<a name="line-7"></a>
<a name="line-8"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Pipes</span><span class='hs-varop'>.</span><span class='hs-conid'>Parse</span> <span class='hs-layout'>(</span>
<a name="line-9"></a> <span class='hs-comment'>-- * Parsing</span>
<a name="line-10"></a> <span class='hs-comment'>-- $parsing</span>
<a name="line-11"></a> <span class='hs-conid'>Parser</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>draw</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>skip</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>drawAll</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>skipAll</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>unDraw</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>peek</span>
<a name="line-18"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isEndOfInput</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldAll</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>foldAllM</span>
<a name="line-21"></a>
<a name="line-22"></a> <span class='hs-comment'>-- * Parsing Lenses</span>
<a name="line-23"></a> <span class='hs-comment'>-- $parsinglenses</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>span</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>splitAt</span>
<a name="line-26"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>groupBy</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>group</span>
<a name="line-28"></a>
<a name="line-29"></a> <span class='hs-comment'>-- * Utilities</span>
<a name="line-30"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toParser</span>
<a name="line-31"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>toParser_</span>
<a name="line-32"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parsed</span>
<a name="line-33"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parsed_</span>
<a name="line-34"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseForever</span>
<a name="line-35"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseForever_</span>
<a name="line-36"></a>
<a name="line-37"></a> <span class='hs-comment'>-- * Re-exports</span>
<a name="line-38"></a> <span class='hs-comment'>-- $reexports</span>
<a name="line-39"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>module</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'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span>
<a name="line-40"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>module</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'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span>
<a name="line-41"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Pipes</span>
<a name="line-42"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-43"></a>
<a name="line-44"></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-layout'>(</span><span class='hs-varid'>join</span><span class='hs-layout'>,</span> <span class='hs-varid'>forever</span><span class='hs-layout'>,</span> <span class='hs-varid'>liftM</span><span class='hs-layout'>)</span>
<a name="line-45"></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'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>Class</span> <span class='hs-layout'>(</span><span class='hs-varid'>lift</span><span class='hs-layout'>)</span>
<a name="line-46"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</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'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>S</span>
<a name="line-47"></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'>Trans</span><span class='hs-varop'>.</span><span class='hs-conid'>State</span><span class='hs-varop'>.</span><span class='hs-conid'>Strict</span> <span class='hs-layout'>(</span>
<a name="line-48"></a> <span class='hs-conid'>StateT</span><span class='hs-layout'>(</span><span class='hs-conid'>StateT</span><span class='hs-layout'>,</span> <span class='hs-varid'>runStateT</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>evalStateT</span><span class='hs-layout'>,</span> <span class='hs-varid'>execStateT</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'>Functor</span><span class='hs-varop'>.</span><span class='hs-conid'>Constant</span> <span class='hs-layout'>(</span><span class='hs-conid'>Constant</span><span class='hs-layout'>(</span><span class='hs-conid'>Constant</span><span class='hs-layout'>,</span> <span class='hs-varid'>getConstant</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'>Foldable</span> <span class='hs-layout'>(</span><span class='hs-varid'>forM_</span><span class='hs-layout'>)</span>
<a name="line-51"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Pipes</span><span class='hs-varop'>.</span><span class='hs-conid'>Internal</span> <span class='hs-layout'>(</span><span class='hs-varid'>unsafeHoist</span><span class='hs-layout'>,</span> <span class='hs-varid'>closed</span><span class='hs-layout'>)</span>
<a name="line-52"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Pipes</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span><span class='hs-layout'>,</span> <span class='hs-varid'>yield</span><span class='hs-layout'>,</span> <span class='hs-varid'>next</span><span class='hs-layout'>)</span>
<a name="line-53"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Pipes</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>NoReexport</span>
<a name="line-54"></a>
<a name="line-55"></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'>span</span><span class='hs-layout'>,</span> <span class='hs-varid'>splitAt</span><span class='hs-layout'>)</span>
<a name="line-56"></a>
<a name="line-57"></a><span class='hs-comment'>{- $parsing
<a name="line-58"></a> @pipes-parse@ handles end-of-input and pushback by storing a 'Producer' in
<a name="line-59"></a> a 'StateT' layer.
<a name="line-60"></a>
<a name="line-61"></a> Connect 'Parser's to 'Producer's using either 'runStateT', 'evalStateT', or
<a name="line-62"></a> 'execStateT':
<a name="line-63"></a>
<a name="line-64"></a>> runStateT :: Parser a m r -> Producer a m x -> m (r, Producer a m x)
<a name="line-65"></a>> evalStateT :: Parser a m r -> Producer a m x -> m r
<a name="line-66"></a>> execStateT :: Parser a m r -> Producer a m x -> m (Producer a m x)
<a name="line-67"></a>> ^^^^^^^^^^^^^^
<a name="line-68"></a>> Leftovers
<a name="line-69"></a>-}</span>
<a name="line-70"></a>
<a name="line-71"></a><a name="Parser"></a><span class='hs-comment'>-- | A 'Parser' is an action that reads from and writes to a stored 'Producer'</span>
<a name="line-72"></a><a name="Parser"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>x</span> <span class='hs-varop'>.</span> <span class='hs-conid'>StateT</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-73"></a>
<a name="line-74"></a><a name="draw"></a><span class='hs-comment'>{-| Draw one element from the underlying 'Producer', returning 'Nothing' if the
<a name="line-75"></a> 'Producer' is empty
<a name="line-76"></a>-}</span>
<a name="line-77"></a><span class='hs-definition'>draw</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-78"></a><span class='hs-definition'>draw</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-79"></a> <span class='hs-varid'>p</span> <span class='hs-keyglyph'><-</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>get</span>
<a name="line-80"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>next</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-81"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-82"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-83"></a> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>put</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span>
<a name="line-85"></a> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-86"></a> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>put</span> <span class='hs-varid'>p'</span>
<a name="line-87"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-88"></a><span class='hs-comment'>{-# INLINABLE draw #-}</span>
<a name="line-89"></a>
<a name="line-90"></a><a name="skip"></a><span class='hs-comment'>{-| Skip one element from the underlying 'Producer', returning 'True' if
<a name="line-91"></a> successful or 'False' if the 'Producer' is empty
<a name="line-92"></a>
<a name="line-93"></a>> skip = fmap isJust draw
<a name="line-94"></a>-}</span>
<a name="line-95"></a><span class='hs-definition'>skip</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span>
<a name="line-96"></a><span class='hs-definition'>skip</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-97"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>draw</span>
<a name="line-98"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-99"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span>
<a name="line-100"></a> <span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-101"></a><span class='hs-comment'>{-# INLINABLE skip #-}</span>
<a name="line-102"></a>
<a name="line-103"></a><a name="drawAll"></a><span class='hs-comment'>{-| Draw all elements from the underlying 'Producer'
<a name="line-104"></a>
<a name="line-105"></a> Note that 'drawAll' is not an idiomatic use of @pipes-parse@, but I provide
<a name="line-106"></a> it for simple testing purposes. Idiomatic @pipes-parse@ style consumes the
<a name="line-107"></a> elements immediately as they are generated instead of loading all elements
<a name="line-108"></a> into memory. For example, you can use 'foldAll' or 'foldAllM' for this
<a name="line-109"></a> purpose.
<a name="line-110"></a>-}</span>
<a name="line-111"></a><span class='hs-definition'>drawAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span>
<a name="line-112"></a><span class='hs-definition'>drawAll</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>id</span>
<a name="line-113"></a> <span class='hs-keyword'>where</span>
<a name="line-114"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>diffAs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-115"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>draw</span>
<a name="line-116"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-117"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>diffAs</span> <span class='hs-conid'>[]</span><span class='hs-layout'>)</span>
<a name="line-118"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>diffAs</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-conop'>:</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-119"></a><span class='hs-comment'>{-# INLINABLE drawAll #-}</span>
<a name="line-120"></a>
<a name="line-121"></a><a name="skipAll"></a><span class='hs-comment'>-- | Drain all elements from the underlying 'Producer'</span>
<a name="line-122"></a><span class='hs-definition'>skipAll</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-123"></a><span class='hs-definition'>skipAll</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span>
<a name="line-124"></a> <span class='hs-keyword'>where</span>
<a name="line-125"></a> <span class='hs-varid'>go</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-126"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>draw</span>
<a name="line-127"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-128"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-129"></a> <span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span>
<a name="line-130"></a><span class='hs-comment'>{-# INLINABLE skipAll #-}</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="unDraw"></a><span class='hs-comment'>-- | Push back an element onto the underlying 'Producer'</span>
<a name="line-133"></a><span class='hs-definition'>unDraw</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-134"></a><span class='hs-definition'>unDraw</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>S</span><span class='hs-varop'>.</span><span class='hs-varid'>modify</span> <span class='hs-layout'>(</span><span class='hs-varid'>yield</span> <span class='hs-varid'>a</span> <span class='hs-varop'>>></span><span class='hs-layout'>)</span>
<a name="line-135"></a><span class='hs-comment'>{-# INLINABLE unDraw #-}</span>
<a name="line-136"></a>
<a name="line-137"></a><a name="peek"></a><span class='hs-comment'>{-| 'peek' checks the first element of the stream, but uses 'unDraw' to push the
<a name="line-138"></a> element back so that it is available for the next 'draw' command.
<a name="line-139"></a>
<a name="line-140"></a>> peek = do
<a name="line-141"></a>> x <- draw
<a name="line-142"></a>> case x of
<a name="line-143"></a>> Nothing -> return ()
<a name="line-144"></a>> Just a -> unDraw a
<a name="line-145"></a>> return x
<a name="line-146"></a>-}</span>
<a name="line-147"></a><span class='hs-definition'>peek</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-148"></a><span class='hs-definition'>peek</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-149"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>draw</span>
<a name="line-150"></a> <span class='hs-varid'>forM_</span> <span class='hs-varid'>x</span> <span class='hs-varid'>unDraw</span>
<a name="line-151"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>x</span>
<a name="line-152"></a><span class='hs-comment'>{-# INLINABLE peek #-}</span>
<a name="line-153"></a>
<a name="line-154"></a><a name="isEndOfInput"></a><span class='hs-comment'>{-| Check if the underlying 'Producer' is empty
<a name="line-155"></a>
<a name="line-156"></a>> isEndOfInput = fmap isNothing peek
<a name="line-157"></a>-}</span>
<a name="line-158"></a><span class='hs-definition'>isEndOfInput</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-conid'>Bool</span>
<a name="line-159"></a><span class='hs-definition'>isEndOfInput</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-160"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>peek</span>
<a name="line-161"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-162"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>True</span>
<a name="line-163"></a> <span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>False</span> <span class='hs-layout'>)</span>
<a name="line-164"></a><span class='hs-comment'>{-# INLINABLE isEndOfInput #-}</span>
<a name="line-165"></a>
<a name="line-166"></a><a name="foldAll"></a><span class='hs-comment'>{-| Fold all input values
<a name="line-167"></a>
<a name="line-168"></a>> Control.Foldl.purely foldAll :: Monad m => Fold a b -> Parser a m b
<a name="line-169"></a>-}</span>
<a name="line-170"></a><span class='hs-definition'>foldAll</span>
<a name="line-171"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-172"></a> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-173"></a> <span class='hs-comment'>-- ^ Step function</span>
<a name="line-174"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>x</span>
<a name="line-175"></a> <span class='hs-comment'>-- ^ Initial accumulator</span>
<a name="line-176"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-177"></a> <span class='hs-comment'>-- ^ Extraction function</span>
<a name="line-178"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-179"></a><span class='hs-definition'>foldAll</span> <span class='hs-varid'>step</span> <span class='hs-varid'>begin</span> <span class='hs-varid'>done</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-varid'>begin</span>
<a name="line-180"></a> <span class='hs-keyword'>where</span>
<a name="line-181"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-182"></a> <span class='hs-varid'>ea</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>draw</span>
<a name="line-183"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>ea</span> <span class='hs-keyword'>of</span>
<a name="line-184"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>done</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-185"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>go</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>step</span> <span class='hs-varid'>x</span> <span class='hs-varid'>a</span>
<a name="line-186"></a><span class='hs-comment'>{-# INLINABLE foldAll #-}</span>
<a name="line-187"></a>
<a name="line-188"></a><a name="foldAllM"></a><span class='hs-comment'>{-| Fold all input values monadically
<a name="line-189"></a>
<a name="line-190"></a>> Control.Foldl.impurely foldAllM :: Monad m => FoldM a m b -> Parser a m b
<a name="line-191"></a>-}</span>
<a name="line-192"></a><span class='hs-definition'>foldAllM</span>
<a name="line-193"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-194"></a> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-195"></a> <span class='hs-comment'>-- ^ Step function</span>
<a name="line-196"></a> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span>
<a name="line-197"></a> <span class='hs-comment'>-- ^ Initial accumulator</span>
<a name="line-198"></a> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-199"></a> <span class='hs-comment'>-- ^ Extraction function</span>
<a name="line-200"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>b</span>
<a name="line-201"></a><span class='hs-definition'>foldAllM</span> <span class='hs-varid'>step</span> <span class='hs-varid'>begin</span> <span class='hs-varid'>done</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-202"></a> <span class='hs-varid'>x0</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-varid'>begin</span>
<a name="line-203"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>x0</span>
<a name="line-204"></a> <span class='hs-keyword'>where</span>
<a name="line-205"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-206"></a> <span class='hs-varid'>ea</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>draw</span>
<a name="line-207"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>ea</span> <span class='hs-keyword'>of</span>
<a name="line-208"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>done</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-209"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-210"></a> <span class='hs-varid'>x'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>step</span> <span class='hs-varid'>x</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-211"></a> <span class='hs-varid'>go</span> <span class='hs-varop'>$!</span> <span class='hs-varid'>x'</span>
<a name="line-212"></a><span class='hs-comment'>{-# INLINABLE foldAllM #-}</span>
<a name="line-213"></a>
<a name="line-214"></a><span class='hs-comment'>{- $parsinglenses
<a name="line-215"></a> Connect lenses to 'Producer's using ('Lens.Family.^.') or
<a name="line-216"></a> 'Lens.Family.view':
<a name="line-217"></a>
<a name="line-218"></a>> (^.) :: Producer a m x
<a name="line-219"></a>> -> Lens' (Producer a m x) (Producer b m y)
<a name="line-220"></a>> -> Producer b m y
<a name="line-221"></a>
<a name="line-222"></a> Connect lenses to 'Parser's using 'Lens.Family.State.Strict.zoom':
<a name="line-223"></a>
<a name="line-224"></a>> zoom :: Lens' (Producer a m x) (Producer b m y)
<a name="line-225"></a>> -> Parser b m r
<a name="line-226"></a>> -> Parser a m r
<a name="line-227"></a>
<a name="line-228"></a> Connect lenses to each other using ('.') (i.e. function composition):
<a name="line-229"></a>
<a name="line-230"></a>> (.) :: Lens' (Producer a m x) (Producer b m y)
<a name="line-231"></a>> -> Lens' (Producer b m y) (Producer c m z)
<a name="line-232"></a>> -> Lens' (Producer a m y) (Producer c m z)
<a name="line-233"></a>-}</span>
<a name="line-234"></a>
<a name="line-235"></a><a name="Lens'"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>Lens'</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>forall</span> <span class='hs-varid'>f</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-conid'>Functor</span> <span class='hs-varid'>f</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>f</span> <span class='hs-varid'>a</span>
<a name="line-236"></a>
<a name="line-237"></a><a name="span"></a><span class='hs-comment'>{-| 'span' is an improper lens that splits the 'Producer' into two 'Producer's,
<a name="line-238"></a> where the outer 'Producer' is the longest consecutive group of elements that
<a name="line-239"></a> satisfy the predicate
<a name="line-240"></a>-}</span>
<a name="line-241"></a><span class='hs-definition'>span</span>
<a name="line-242"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-243"></a> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lens'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-244"></a><span class='hs-definition'>span</span> <span class='hs-varid'>predicate</span> <span class='hs-varid'>k</span> <span class='hs-varid'>p0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>join</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-varid'>p0</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-245"></a> <span class='hs-keyword'>where</span>
<a name="line-246"></a><span class='hs-comment'>-- to :: Monad m => Producer a m x -> Producer a m (Producer a m x)</span>
<a name="line-247"></a> <span class='hs-varid'>to</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-248"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>next</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-249"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-250"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-251"></a> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-252"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>predicate</span> <span class='hs-varid'>a</span>
<a name="line-253"></a> <span class='hs-keyword'>then</span> <span class='hs-keyword'>do</span>
<a name="line-254"></a> <span class='hs-varid'>yield</span> <span class='hs-varid'>a</span>
<a name="line-255"></a> <span class='hs-varid'>to</span> <span class='hs-varid'>p'</span>
<a name="line-256"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>yield</span> <span class='hs-varid'>a</span> <span class='hs-varop'>>></span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span>
<a name="line-257"></a><span class='hs-comment'>{-# INLINABLE span #-}</span>
<a name="line-258"></a>
<a name="line-259"></a><a name="splitAt"></a><span class='hs-comment'>{-| 'splitAt' is an improper lens that splits a 'Producer' into two 'Producer's
<a name="line-260"></a> after a fixed number of elements
<a name="line-261"></a>-}</span>
<a name="line-262"></a><span class='hs-definition'>splitAt</span>
<a name="line-263"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-264"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lens'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-265"></a><span class='hs-definition'>splitAt</span> <span class='hs-varid'>n0</span> <span class='hs-varid'>k</span> <span class='hs-varid'>p0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>join</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-varid'>n0</span> <span class='hs-varid'>p0</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-266"></a> <span class='hs-keyword'>where</span>
<a name="line-267"></a><span class='hs-comment'>-- to :: Monad m => Int -> Producer a m x -> Producer a m (Producer a m x)</span>
<a name="line-268"></a> <span class='hs-varid'>to</span> <span class='hs-varid'>n</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span>
<a name="line-269"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0</span>
<a name="line-270"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>p</span>
<a name="line-271"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span>
<a name="line-272"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>next</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-273"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-274"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-275"></a> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-276"></a> <span class='hs-varid'>yield</span> <span class='hs-varid'>a</span>
<a name="line-277"></a> <span class='hs-varid'>to</span> <span class='hs-layout'>(</span><span class='hs-varid'>n</span> <span class='hs-comment'>-</span> <span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varid'>p'</span>
<a name="line-278"></a><span class='hs-comment'>{-# INLINABLE splitAt #-}</span>
<a name="line-279"></a>
<a name="line-280"></a><a name="%5e."></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'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Constant</span> <span class='hs-varid'>b</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Constant</span> <span class='hs-varid'>b</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>b</span>
<a name="line-281"></a><a name="a"></a><span class='hs-definition'>a</span> <span class='hs-varop'>^.</span> <span class='hs-varid'>lens</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>getConstant</span> <span class='hs-layout'>(</span><span class='hs-varid'>lens</span> <span class='hs-conid'>Constant</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-282"></a>
<a name="line-283"></a><a name="groupBy"></a><span class='hs-comment'>{-| 'groupBy' splits a 'Producer' into two 'Producer's after the first group of
<a name="line-284"></a> elements that are equal according to the equality predicate
<a name="line-285"></a>-}</span>
<a name="line-286"></a><span class='hs-definition'>groupBy</span>
<a name="line-287"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-288"></a> <span class='hs-keyglyph'>=></span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-289"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lens'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-290"></a><span class='hs-definition'>groupBy</span> <span class='hs-varid'>equals</span> <span class='hs-varid'>k</span> <span class='hs-varid'>p0</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>join</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-layout'>(</span><span class='hs-varid'>to</span> <span class='hs-varid'>p0</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-291"></a> <span class='hs-keyword'>where</span>
<a name="line-292"></a><span class='hs-comment'>-- to :: Monad m => Producer a m r -> Producer a m (Producer a m x)</span>
<a name="line-293"></a> <span class='hs-varid'>to</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-294"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>next</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-295"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-296"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-297"></a> <span class='hs-conid'>Right</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-varid'>yield</span> <span class='hs-varid'>a</span> <span class='hs-varop'>>></span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span> <span class='hs-varop'>^.</span> <span class='hs-varid'>span</span> <span class='hs-layout'>(</span><span class='hs-varid'>equals</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span>
<a name="line-298"></a><span class='hs-comment'>{-# INLINABLE groupBy #-}</span>
<a name="line-299"></a>
<a name="line-300"></a><a name="group"></a><span class='hs-comment'>-- | Like 'groupBy', where the equality predicate is ('==')</span>
<a name="line-301"></a><span class='hs-definition'>group</span>
<a name="line-302"></a> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span><span class='hs-layout'>,</span> <span class='hs-conid'>Eq</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Lens'</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-303"></a><span class='hs-definition'>group</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>groupBy</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span>
<a name="line-304"></a><span class='hs-comment'>{-# INLINABLE group #-}</span>
<a name="line-305"></a>
<a name="line-306"></a><a name="toParser"></a><span class='hs-comment'>{-| Convert a 'Consumer' to a 'Parser'
<a name="line-307"></a>
<a name="line-308"></a> 'Nothing' signifies end of input
<a name="line-309"></a>-}</span>
<a name="line-310"></a><span class='hs-definition'>toParser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Consumer</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-311"></a><span class='hs-definition'>toParser</span> <span class='hs-varid'>consumer</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runEffect</span> <span class='hs-layout'>(</span><span class='hs-varid'>lift</span> <span class='hs-varid'>draw</span> <span class='hs-varop'>>~</span> <span class='hs-varid'>unsafeHoist</span> <span class='hs-varid'>lift</span> <span class='hs-varid'>consumer</span><span class='hs-layout'>)</span>
<a name="line-312"></a><span class='hs-comment'>{-# INLINABLE toParser #-}</span>
<a name="line-313"></a>
<a name="line-314"></a><a name="toParser_"></a><span class='hs-comment'>-- | Convert a never-ending 'Consumer' to a 'Parser'</span>
<a name="line-315"></a><span class='hs-definition'>toParser_</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Consumer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-conid'>X</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-316"></a><span class='hs-definition'>toParser_</span> <span class='hs-varid'>consumer</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>StateT</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>producer</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-317"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runEffect</span> <span class='hs-layout'>(</span><span class='hs-varid'>producer</span> <span class='hs-varop'>>-></span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>closed</span> <span class='hs-varid'>consumer</span><span class='hs-layout'>)</span>
<a name="line-318"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>()</span><span class='hs-layout'>,</span> <span class='hs-varid'>return</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-319"></a><span class='hs-comment'>{-# INLINABLE toParser_ #-}</span>
<a name="line-320"></a>
<a name="line-321"></a>
<a name="line-322"></a><a name="parsed"></a><span class='hs-comment'>{-| Run a `Parser` repeatedly on a `Producer`, `yield`ing each `Right result
<a name="line-323"></a>
<a name="line-324"></a> Returns the remainder of the `Producer` when the `Parser` returns `Left`
<a name="line-325"></a>-}</span>
<a name="line-326"></a><span class='hs-definition'>parsed</span>
<a name="line-327"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-328"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>e</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-329"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Producer</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-330"></a><span class='hs-definition'>parsed</span> <span class='hs-varid'>parser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span>
<a name="line-331"></a> <span class='hs-keyword'>where</span>
<a name="line-332"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-333"></a> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lift</span> <span class='hs-layout'>(</span><span class='hs-varid'>runStateT</span> <span class='hs-varid'>parser</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-334"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-335"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>r</span><span class='hs-layout'>,</span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span>
<a name="line-336"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-337"></a> <span class='hs-varid'>yield</span> <span class='hs-varid'>b</span>
<a name="line-338"></a> <span class='hs-varid'>go</span> <span class='hs-varid'>p'</span>
<a name="line-339"></a><span class='hs-comment'>{-# INLINABLE parsed #-}</span>
<a name="line-340"></a>
<a name="line-341"></a><a name="parsed_"></a><span class='hs-comment'>{-| Run a `Parser` repeatedly on a `Producer`, `yield`ing each `Just` result
<a name="line-342"></a>
<a name="line-343"></a> Returns the remainder of the `Producer` when the `Parser` returns `Nothing`
<a name="line-344"></a>-}</span>
<a name="line-345"></a><span class='hs-definition'>parsed_</span>
<a name="line-346"></a> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span>
<a name="line-347"></a> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span>
<a name="line-348"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-349"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Producer</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-layout'>(</span><span class='hs-conid'>Producer</span> <span class='hs-varid'>a</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span>
<a name="line-350"></a><span class='hs-definition'>parsed_</span> <span class='hs-varid'>parser</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-351"></a> <span class='hs-layout'>(</span><span class='hs-conid'>()</span><span class='hs-layout'>,</span> <span class='hs-varid'>p'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>parsed</span> <span class='hs-varid'>parser'</span> <span class='hs-varid'>p</span>
<a name="line-352"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>p'</span>
<a name="line-353"></a> <span class='hs-keyword'>where</span>
<a name="line-354"></a> <span class='hs-varid'>parser'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-355"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>parser</span>
<a name="line-356"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-keyword'>case</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>of</span>
<a name="line-357"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Left</span> <span class='hs-conid'>()</span>
<a name="line-358"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>b</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Right</span> <span class='hs-varid'>b</span> <span class='hs-layout'>)</span>
<a name="line-359"></a><span class='hs-comment'>{-# INLINABLE parsed_ #-}</span>
<a name="line-360"></a>
<a name="line-361"></a><a name="parseForever"></a><span class='hs-comment'>-- | Convert a 'Parser' to a 'Pipe' by running it repeatedly on the input</span>
<a name="line-362"></a><span class='hs-definition'>parseForever</span> <span class='hs-keyglyph'>::</span>
<a name="line-363"></a> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span>
<a name="line-364"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>n</span><span class='hs-varop'>.</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>r</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-365"></a> <span class='hs-conid'>Pipe</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-varid'>r</span>
<a name="line-366"></a><span class='hs-definition'>parseForever</span> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>go</span> <span class='hs-layout'>(</span><span class='hs-varid'>forever</span> <span class='hs-layout'>(</span><span class='hs-varid'>lift</span> <span class='hs-varid'>await</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>yield</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-367"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>go</span> <span class='hs-varid'>prod</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-varid'>prod'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>runStateT</span> <span class='hs-varid'>parse</span> <span class='hs-varid'>prod</span>
<a name="line-368"></a> <span class='hs-varid'>either</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'>>></span> <span class='hs-varid'>go</span> <span class='hs-varid'>prod'</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>yield</span><span class='hs-layout'>)</span> <span class='hs-varid'>b</span>
<a name="line-369"></a><span class='hs-comment'>{-# DEPRECATED parseForever "Use `parsed` instead" #-}</span>
<a name="line-370"></a>
<a name="line-371"></a><a name="parseForever_"></a><span class='hs-comment'>-- | Variant of `parseForever` for parsers which return a Maybe</span>
<a name="line-372"></a><span class='hs-comment'>-- instead of an Either</span>
<a name="line-373"></a><span class='hs-definition'>parseForever_</span> <span class='hs-keyglyph'>::</span>
<a name="line-374"></a> <span class='hs-conid'>Monad</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span>
<a name="line-375"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>forall</span> <span class='hs-varid'>n</span><span class='hs-varop'>.</span> <span class='hs-conid'>Monad</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parser</span> <span class='hs-varid'>a</span> <span class='hs-varid'>n</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-376"></a> <span class='hs-conid'>Pipe</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span> <span class='hs-varid'>m</span> <span class='hs-conid'>()</span>
<a name="line-377"></a><span class='hs-definition'>parseForever_</span> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseForever</span> <span class='hs-layout'>(</span><span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-varid'>maybe</span> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-conid'>Right</span><span class='hs-layout'>)</span> <span class='hs-varid'>parse</span><span class='hs-layout'>)</span>
<a name="line-378"></a><span class='hs-comment'>{-# DEPRECATED parseForever_ "Use `parsed_` instead" #-}</span>
<a name="line-379"></a>
<a name="line-380"></a><span class='hs-comment'>{- $reexports
<a name="line-381"></a> "Control.Monad.Trans.Class" re-exports 'lift'.
<a name="line-382"></a>
<a name="line-383"></a> "Control.Monad.Trans.State.Strict" re-exports 'StateT', 'runStateT',
<a name="line-384"></a> 'evalStateT', and 'execStateT'.
<a name="line-385"></a>
<a name="line-386"></a> "Pipes" re-exports 'Producer', 'yield', and 'next'.
<a name="line-387"></a>-}</span>
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