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<title>src/Language/Haskell/Exts/ParseMonad.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_HADDOCK hide #-}</span>
<a name="line-2"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-3"></a><span class='hs-comment'>-- |</span>
<a name="line-4"></a><span class='hs-comment'>-- Module : Language.Haskell.Exts.Annotated.ParseMonad</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : Niklas Broberg (c) 2004-2009,</span>
<a name="line-6"></a><span class='hs-comment'>-- Original (c) The GHC Team, 1997-2000</span>
<a name="line-7"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/base/LICENSE)</span>
<a name="line-8"></a><span class='hs-comment'>--</span>
<a name="line-9"></a><span class='hs-comment'>-- Maintainer : Niklas Broberg, d00nibro@chalmers.se</span>
<a name="line-10"></a><span class='hs-comment'>-- Stability : stable</span>
<a name="line-11"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-12"></a><span class='hs-comment'>--</span>
<a name="line-13"></a><span class='hs-comment'>-- Monads for the Haskell parser and lexer.</span>
<a name="line-14"></a><span class='hs-comment'>--</span>
<a name="line-15"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-16"></a>
<a name="line-17"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span><span class='hs-varop'>.</span><span class='hs-conid'>ParseMonad</span><span class='hs-layout'>(</span>
<a name="line-18"></a> <span class='hs-comment'>-- * Parsing</span>
<a name="line-19"></a> <span class='hs-conid'>P</span><span class='hs-layout'>,</span> <span class='hs-conid'>ParseResult</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>atSrcLoc</span><span class='hs-layout'>,</span> <span class='hs-conid'>LexContext</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-20"></a> <span class='hs-conid'>ParseMode</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>defaultParseMode</span><span class='hs-layout'>,</span> <span class='hs-varid'>fromParseResult</span><span class='hs-layout'>,</span>
<a name="line-21"></a> <span class='hs-varid'>runParserWithMode</span><span class='hs-layout'>,</span> <span class='hs-varid'>runParserWithModeComments</span><span class='hs-layout'>,</span> <span class='hs-varid'>runParser</span><span class='hs-layout'>,</span>
<a name="line-22"></a> <span class='hs-varid'>getSrcLoc</span><span class='hs-layout'>,</span> <span class='hs-varid'>pushCurrentContext</span><span class='hs-layout'>,</span> <span class='hs-varid'>popContext</span><span class='hs-layout'>,</span>
<a name="line-23"></a> <span class='hs-varid'>getExtensions</span><span class='hs-layout'>,</span>
<a name="line-24"></a> <span class='hs-comment'>-- * Lexing</span>
<a name="line-25"></a> <span class='hs-conid'>Lex</span><span class='hs-layout'>(</span><span class='hs-varid'>runL</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>getInput</span><span class='hs-layout'>,</span> <span class='hs-varid'>discard</span><span class='hs-layout'>,</span> <span class='hs-varid'>lexNewline</span><span class='hs-layout'>,</span> <span class='hs-varid'>lexTab</span><span class='hs-layout'>,</span> <span class='hs-varid'>lexWhile</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-varid'>alternative</span><span class='hs-layout'>,</span> <span class='hs-varid'>checkBOL</span><span class='hs-layout'>,</span> <span class='hs-varid'>setBOL</span><span class='hs-layout'>,</span> <span class='hs-varid'>startToken</span><span class='hs-layout'>,</span> <span class='hs-varid'>getOffside</span><span class='hs-layout'>,</span>
<a name="line-27"></a> <span class='hs-varid'>pushContextL</span><span class='hs-layout'>,</span> <span class='hs-varid'>popContextL</span><span class='hs-layout'>,</span> <span class='hs-varid'>getExtensionsL</span><span class='hs-layout'>,</span> <span class='hs-varid'>pushComment</span><span class='hs-layout'>,</span>
<a name="line-28"></a> <span class='hs-varid'>getSrcLocL</span><span class='hs-layout'>,</span> <span class='hs-varid'>setSrcLineL</span><span class='hs-layout'>,</span> <span class='hs-varid'>ignoreLinePragmasL</span><span class='hs-layout'>,</span> <span class='hs-varid'>setLineFilenameL</span><span class='hs-layout'>,</span>
<a name="line-29"></a> <span class='hs-comment'>-- * Harp/Hsx</span>
<a name="line-30"></a> <span class='hs-conid'>ExtContext</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-31"></a> <span class='hs-varid'>pushExtContextL</span><span class='hs-layout'>,</span> <span class='hs-varid'>popExtContextL</span><span class='hs-layout'>,</span> <span class='hs-varid'>getExtContext</span><span class='hs-layout'>,</span>
<a name="line-32"></a> <span class='hs-varid'>pullCtxtFlag</span><span class='hs-layout'>,</span> <span class='hs-varid'>flagDo</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-varid'>getModuleName</span>
<a name="line-34"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-35"></a>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span><span class='hs-varop'>.</span><span class='hs-conid'>SrcLoc</span><span class='hs-layout'>(</span><span class='hs-conid'>SrcLoc</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-37"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span><span class='hs-varop'>.</span><span class='hs-conid'>Fixity</span> <span class='hs-layout'>(</span><span class='hs-conid'>Fixity</span><span class='hs-layout'>,</span> <span class='hs-varid'>preludeFixities</span><span class='hs-layout'>)</span>
<a name="line-38"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span><span class='hs-varop'>.</span><span class='hs-conid'>Comments</span>
<a name="line-39"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>Exts</span><span class='hs-varop'>.</span><span class='hs-conid'>Extension</span> <span class='hs-layout'>(</span><span class='hs-conid'>Extension</span><span class='hs-layout'>,</span> <span class='hs-varid'>impliesExts</span><span class='hs-layout'>)</span>
<a name="line-40"></a>
<a name="line-41"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span> <span class='hs-varid'>intersperse</span> <span class='hs-layout'>)</span>
<a name="line-42"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Applicative</span>
<a name="line-43"></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'>when</span><span class='hs-layout'>)</span>
<a name="line-44"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Monoid</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="ParseResult"></a><span class='hs-comment'>-- | The result of a parse.</span>
<a name="line-47"></a><a name="ParseResult"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ParseResult</span> <span class='hs-varid'>a</span>
<a name="line-48"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseOk</span> <span class='hs-varid'>a</span> <span class='hs-comment'>-- ^ The parse succeeded, yielding a value.</span>
<a name="line-49"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ParseFailed</span> <span class='hs-conid'>SrcLoc</span> <span class='hs-conid'>String</span>
<a name="line-50"></a> <span class='hs-comment'>-- ^ The parse failed at the specified</span>
<a name="line-51"></a> <span class='hs-comment'>-- source location, with an error message.</span>
<a name="line-52"></a> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Show</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="fromParseResult"></a><span class='hs-comment'>-- | Retrieve the result of a successful parse, throwing an</span>
<a name="line-55"></a><span class='hs-comment'>-- error if the parse is actually not successful.</span>
<a name="line-56"></a><span class='hs-definition'>fromParseResult</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseResult</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>a</span>
<a name="line-57"></a><span class='hs-definition'>fromParseResult</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParseOk</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>a</span>
<a name="line-58"></a><span class='hs-definition'>fromParseResult</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>str</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"fromParseResult: Parse failed at ["</span>
<a name="line-59"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>srcFilename</span> <span class='hs-varid'>loc</span> <span class='hs-varop'>++</span> <span class='hs-str'>"] ("</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>srcLine</span> <span class='hs-varid'>loc</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>":"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>srcColumn</span> <span class='hs-varid'>loc</span><span class='hs-layout'>)</span> <span class='hs-varop'>++</span> <span class='hs-str'>"): "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>str</span>
<a name="line-60"></a>
<a name="line-61"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Functor</span> <span class='hs-conid'>ParseResult</span> <span class='hs-keyword'>where</span>
<a name="line-62"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParseOk</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseOk</span> <span class='hs-varop'>$</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span>
<a name="line-63"></a> <span class='hs-varid'>fmap</span> <span class='hs-varid'>f</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span>
<a name="line-64"></a>
<a name="line-65"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Applicative</span> <span class='hs-conid'>ParseResult</span> <span class='hs-keyword'>where</span>
<a name="line-66"></a> <span class='hs-varid'>pure</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseOk</span>
<a name="line-67"></a> <span class='hs-conid'>ParseOk</span> <span class='hs-varid'>f</span> <span class='hs-varop'><*></span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varop'><$></span> <span class='hs-varid'>x</span>
<a name="line-68"></a> <span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span> <span class='hs-varop'><*></span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span>
<a name="line-69"></a>
<a name="line-70"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-conid'>ParseResult</span> <span class='hs-keyword'>where</span>
<a name="line-71"></a> <span class='hs-varid'>return</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseOk</span>
<a name="line-72"></a> <span class='hs-conid'>ParseOk</span> <span class='hs-varid'>x</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>f</span> <span class='hs-varid'>x</span>
<a name="line-73"></a> <span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span> <span class='hs-varop'>>>=</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span>
<a name="line-74"></a>
<a name="line-75"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monoid</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Monoid</span> <span class='hs-layout'>(</span><span class='hs-conid'>ParseResult</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-76"></a> <span class='hs-varid'>mempty</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseOk</span> <span class='hs-varid'>mempty</span>
<a name="line-77"></a> <span class='hs-conid'>ParseOk</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`mappend`</span> <span class='hs-conid'>ParseOk</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseOk</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`mappend`</span> <span class='hs-varid'>y</span>
<a name="line-78"></a> <span class='hs-conid'>ParseOk</span> <span class='hs-varid'>x</span> <span class='hs-varop'>`mappend`</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>err</span>
<a name="line-79"></a> <span class='hs-varid'>err</span> <span class='hs-varop'>`mappend`</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>err</span> <span class='hs-comment'>-- left-biased</span>
<a name="line-80"></a>
<a name="line-81"></a>
<a name="line-82"></a><a name="ParseStatus"></a><span class='hs-comment'>-- internal version</span>
<a name="line-83"></a><a name="ParseStatus"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ParseStatus</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Ok</span> <span class='hs-conid'>ParseState</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Failed</span> <span class='hs-conid'>SrcLoc</span> <span class='hs-conid'>String</span>
<a name="line-84"></a> <span class='hs-keyword'>deriving</span> <span class='hs-conid'>Show</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="LexContext"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>LexContext</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>NoLayout</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Layout</span> <span class='hs-conid'>Int</span>
<a name="line-87"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span><span class='hs-conid'>Ord</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-88"></a>
<a name="line-89"></a><a name="ExtContext"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ExtContext</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>CodeCtxt</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>HarpCtxt</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>TagCtxt</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ChildCtxt</span>
<a name="line-90"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CloseTagCtxt</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>CodeTagCtxt</span>
<a name="line-91"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span><span class='hs-conid'>Ord</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-92"></a>
<a name="line-93"></a><a name="CtxtFlag"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>CtxtFlag</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-conid'>Bool</span><span class='hs-layout'>,</span><span class='hs-conid'>Bool</span><span class='hs-layout'>)</span>
<a name="line-94"></a><span class='hs-comment'>-- (True,_) = We're in a do context.</span>
<a name="line-95"></a><span class='hs-comment'>-- (_, True)= Next token must be a virtual closing brace.</span>
<a name="line-96"></a>
<a name="line-97"></a><a name="ParseState"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>ParseState</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>LexContext</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>ExtContext</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span><span class='hs-conid'>CtxtFlag</span><span class='hs-layout'>,</span><span class='hs-keyglyph'>[</span><span class='hs-conid'>Comment</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-98"></a>
<a name="line-99"></a><a name="indentOfParseState"></a><span class='hs-definition'>indentOfParseState</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseState</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-100"></a><span class='hs-definition'>indentOfParseState</span> <span class='hs-layout'>(</span><span class='hs-conid'>Layout</span> <span class='hs-varid'>n</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>n</span>
<a name="line-101"></a><span class='hs-definition'>indentOfParseState</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>0</span>
<a name="line-102"></a>
<a name="line-103"></a><span class='hs-comment'>-- | Static parameters governing a parse.</span>
<a name="line-104"></a><span class='hs-comment'>-- Note that the various parse functions in "Language.Haskell.Exts.Parser"</span>
<a name="line-105"></a><span class='hs-comment'>-- never look at LANGUAGE pragmas, regardless of</span>
<a name="line-106"></a><span class='hs-comment'>-- what the @ignoreLanguagePragmas@ flag is set to.</span>
<a name="line-107"></a><span class='hs-comment'>-- Only the various @parseFile@ functions in "Language.Haskell.Exts" will</span>
<a name="line-108"></a><span class='hs-comment'>-- act on it, when set to 'False'.</span>
<a name="line-109"></a>
<a name="line-110"></a><a name="ParseMode"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>ParseMode</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseMode</span> <span class='hs-layout'>{</span>
<a name="line-111"></a> <span class='hs-comment'>-- | original name of the file being parsed</span>
<a name="line-112"></a> <span class='hs-varid'>parseFilename</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span><span class='hs-layout'>,</span>
<a name="line-113"></a> <span class='hs-comment'>-- | list of extensions enabled for parsing</span>
<a name="line-114"></a> <span class='hs-varid'>extensions</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Extension</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>,</span>
<a name="line-115"></a> <span class='hs-comment'>-- | if 'True', the parser won't care about further extensions</span>
<a name="line-116"></a> <span class='hs-comment'>-- in LANGUAGE pragmas in source files</span>
<a name="line-117"></a> <span class='hs-varid'>ignoreLanguagePragmas</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>,</span>
<a name="line-118"></a> <span class='hs-comment'>-- | if 'True', the parser won't read line position information</span>
<a name="line-119"></a> <span class='hs-comment'>-- from LINE pragmas in source files</span>
<a name="line-120"></a> <span class='hs-varid'>ignoreLinePragmas</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span><span class='hs-layout'>,</span>
<a name="line-121"></a> <span class='hs-comment'>-- | list of fixities to be aware of</span>
<a name="line-122"></a> <span class='hs-varid'>fixities</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Fixity</span><span class='hs-keyglyph'>]</span>
<a name="line-123"></a> <span class='hs-layout'>}</span>
<a name="line-124"></a>
<a name="line-125"></a><a name="defaultParseMode"></a><span class='hs-comment'>-- | Default parameters for a parse.</span>
<a name="line-126"></a><span class='hs-comment'>-- The default is an unknown filename,</span>
<a name="line-127"></a><span class='hs-comment'>-- no extensions (i.e. Haskell 98),</span>
<a name="line-128"></a><span class='hs-comment'>-- don't ignore LANGUAGE pragmas, do ignore LINE pragmas,</span>
<a name="line-129"></a><span class='hs-comment'>-- and be aware of fixities from the 'Prelude'.</span>
<a name="line-130"></a><span class='hs-definition'>defaultParseMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseMode</span>
<a name="line-131"></a><span class='hs-definition'>defaultParseMode</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ParseMode</span> <span class='hs-layout'>{</span>
<a name="line-132"></a> <span class='hs-varid'>parseFilename</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"<unknown>.hs"</span><span class='hs-layout'>,</span>
<a name="line-133"></a> <span class='hs-varid'>extensions</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span><span class='hs-layout'>,</span>
<a name="line-134"></a> <span class='hs-varid'>ignoreLanguagePragmas</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>False</span><span class='hs-layout'>,</span>
<a name="line-135"></a> <span class='hs-varid'>ignoreLinePragmas</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>True</span><span class='hs-layout'>,</span>
<a name="line-136"></a> <span class='hs-varid'>fixities</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>preludeFixities</span>
<a name="line-137"></a> <span class='hs-layout'>}</span>
<a name="line-138"></a>
<a name="line-139"></a><span class='hs-comment'>-- | Monad for parsing</span>
<a name="line-140"></a>
<a name="line-141"></a><a name="P"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runP</span> <span class='hs-keyglyph'>::</span>
<a name="line-142"></a> <span class='hs-conid'>String</span> <span class='hs-comment'>-- input string</span>
<a name="line-143"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- current column</span>
<a name="line-144"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-comment'>-- current line</span>
<a name="line-145"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SrcLoc</span> <span class='hs-comment'>-- location of last token read</span>
<a name="line-146"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ParseState</span> <span class='hs-comment'>-- layout info.</span>
<a name="line-147"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ParseMode</span> <span class='hs-comment'>-- parse parameters</span>
<a name="line-148"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ParseStatus</span> <span class='hs-varid'>a</span>
<a name="line-149"></a> <span class='hs-layout'>}</span>
<a name="line-150"></a>
<a name="line-151"></a><a name="runParserWithMode"></a><span class='hs-definition'>runParserWithMode</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseMode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ParseResult</span> <span class='hs-varid'>a</span>
<a name="line-152"></a><span class='hs-comment'>{-runParserWithMode mode (P m) s = case m s 0 1 start ([],[],(False,False),[]) mode of
<a name="line-153"></a> Ok _ a -> ParseOk a
<a name="line-154"></a> Failed loc msg -> ParseFailed loc msg
<a name="line-155"></a> where start = SrcLoc {
<a name="line-156"></a> srcFilename = parseFilename mode,
<a name="line-157"></a> srcLine = 1,
<a name="line-158"></a> srcColumn = 1
<a name="line-159"></a> }
<a name="line-160"></a>-}</span>
<a name="line-161"></a><span class='hs-definition'>runParserWithMode</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>pm</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>fst</span> <span class='hs-varop'>$</span> <span class='hs-varid'>runParserWithModeComments</span> <span class='hs-varid'>mode</span> <span class='hs-varid'>pm</span> <span class='hs-varid'>s</span>
<a name="line-162"></a>
<a name="line-163"></a><a name="runParser"></a><span class='hs-definition'>runParser</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ParseResult</span> <span class='hs-varid'>a</span>
<a name="line-164"></a><span class='hs-definition'>runParser</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runParserWithMode</span> <span class='hs-varid'>defaultParseMode</span>
<a name="line-165"></a>
<a name="line-166"></a><a name="runParserWithModeComments"></a><span class='hs-definition'>runParserWithModeComments</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ParseMode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ParseResult</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Comment</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-167"></a><span class='hs-definition'>runParserWithModeComments</span> <span class='hs-varid'>mode</span> <span class='hs-layout'>(</span><span class='hs-conid'>P</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>m</span> <span class='hs-varid'>s</span> <span class='hs-num'>0</span> <span class='hs-num'>1</span> <span class='hs-varid'>start</span> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span><span class='hs-conid'>False</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-conid'>[]</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>allExts</span> <span class='hs-varid'>mode</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-168"></a> <span class='hs-conid'>Ok</span> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ParseOk</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <span class='hs-conid'>Failed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ParseFailed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span>
<a name="line-170"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>start</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SrcLoc</span> <span class='hs-layout'>{</span>
<a name="line-171"></a> <span class='hs-varid'>srcFilename</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseFilename</span> <span class='hs-varid'>mode</span><span class='hs-layout'>,</span>
<a name="line-172"></a> <span class='hs-varid'>srcLine</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1</span><span class='hs-layout'>,</span>
<a name="line-173"></a> <span class='hs-varid'>srcColumn</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>1</span>
<a name="line-174"></a> <span class='hs-layout'>}</span>
<a name="line-175"></a> <span class='hs-varid'>allExts</span> <span class='hs-varid'>mode</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-conid'>ParseMode</span> <span class='hs-layout'>{</span><span class='hs-varid'>extensions</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>es</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mode</span> <span class='hs-layout'>{</span> <span class='hs-varid'>extensions</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>impliesExts</span> <span class='hs-varid'>es</span> <span class='hs-layout'>}</span>
<a name="line-176"></a>
<a name="line-177"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-conid'>P</span> <span class='hs-keyword'>where</span>
<a name="line-178"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-varid'>s</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ok</span> <span class='hs-varid'>s</span> <span class='hs-varid'>a</span>
<a name="line-179"></a> <span class='hs-conid'>P</span> <span class='hs-varid'>m</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>k</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>s</span> <span class='hs-varid'>mode</span> <span class='hs-keyglyph'>-></span>
<a name="line-180"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>m</span> <span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>s</span> <span class='hs-varid'>mode</span> <span class='hs-keyword'>of</span>
<a name="line-181"></a> <span class='hs-conid'>Failed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>msg</span>
<a name="line-182"></a> <span class='hs-conid'>Ok</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>k</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>mode</span>
<a name="line-183"></a> <span class='hs-varid'>fail</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_r</span> <span class='hs-sel'>_col</span> <span class='hs-sel'>_line</span> <span class='hs-varid'>loc</span> <span class='hs-sel'>_stk</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failed</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>s</span>
<a name="line-184"></a>
<a name="line-185"></a><a name="atSrcLoc"></a><span class='hs-definition'>atSrcLoc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>SrcLoc</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span>
<a name="line-186"></a><span class='hs-conid'>P</span> <span class='hs-varid'>m</span> <span class='hs-varop'>`atSrcLoc`</span> <span class='hs-varid'>loc</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-sel'>_l</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>m</span> <span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span>
<a name="line-187"></a>
<a name="line-188"></a><a name="getSrcLoc"></a><span class='hs-definition'>getSrcLoc</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-conid'>SrcLoc</span>
<a name="line-189"></a><span class='hs-definition'>getSrcLoc</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-varid'>l</span> <span class='hs-varid'>s</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ok</span> <span class='hs-varid'>s</span> <span class='hs-varid'>l</span>
<a name="line-190"></a>
<a name="line-191"></a><a name="getModuleName"></a><span class='hs-definition'>getModuleName</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-conid'>String</span>
<a name="line-192"></a><span class='hs-definition'>getModuleName</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span>
<a name="line-193"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>fn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseFilename</span> <span class='hs-varid'>m</span>
<a name="line-194"></a> <span class='hs-varid'>mn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>intersperse</span> <span class='hs-str'>"."</span> <span class='hs-varop'>$</span> <span class='hs-varid'>splitPath</span> <span class='hs-varid'>fn</span>
<a name="line-195"></a>
<a name="line-196"></a> <span class='hs-varid'>splitPath</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>String</span><span class='hs-keyglyph'>]</span>
<a name="line-197"></a> <span class='hs-varid'>splitPath</span> <span class='hs-str'>""</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>[]</span>
<a name="line-198"></a> <span class='hs-varid'>splitPath</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span><span class='hs-layout'>,</span><span class='hs-varid'>str'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>break</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-varop'>==</span><span class='hs-layout'>)</span> <span class='hs-varid'>str</span>
<a name="line-199"></a> <span class='hs-keyword'>in</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>str'</span> <span class='hs-keyword'>of</span>
<a name="line-200"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>removeSuffix</span> <span class='hs-varid'>l</span><span class='hs-keyglyph'>]</span>
<a name="line-201"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>str''</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>l</span> <span class='hs-conop'>:</span> <span class='hs-varid'>splitPath</span> <span class='hs-varid'>str''</span>
<a name="line-202"></a>
<a name="line-203"></a> <span class='hs-varid'>removeSuffix</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>reverse</span> <span class='hs-varop'>$</span> <span class='hs-varid'>tail</span> <span class='hs-varop'>$</span> <span class='hs-varid'>dropWhile</span> <span class='hs-layout'>(</span><span class='hs-chr'>'.'</span><span class='hs-varop'>/=</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>reverse</span> <span class='hs-varid'>l</span>
<a name="line-204"></a>
<a name="line-205"></a> <span class='hs-keyword'>in</span> <span class='hs-conid'>Ok</span> <span class='hs-varid'>s</span> <span class='hs-varid'>mn</span>
<a name="line-206"></a>
<a name="line-207"></a><span class='hs-comment'>-- Enter a new layout context. If we are already in a layout context,</span>
<a name="line-208"></a><span class='hs-comment'>-- ensure that the new indent is greater than the indent of that context.</span>
<a name="line-209"></a><span class='hs-comment'>-- (So if the source loc is not to the right of the current indent, an</span>
<a name="line-210"></a><span class='hs-comment'>-- empty list {} will be inserted.)</span>
<a name="line-211"></a>
<a name="line-212"></a><a name="pushCurrentContext"></a><span class='hs-definition'>pushCurrentContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-conid'>()</span>
<a name="line-213"></a><span class='hs-definition'>pushCurrentContext</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-214"></a> <span class='hs-varid'>lc</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getSrcLoc</span>
<a name="line-215"></a> <span class='hs-varid'>indent</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>currentIndent</span>
<a name="line-216"></a> <span class='hs-varid'>dob</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>pullDoStatus</span>
<a name="line-217"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loc</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>srcColumn</span> <span class='hs-varid'>lc</span>
<a name="line-218"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>dob</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>loc</span> <span class='hs-varop'><</span> <span class='hs-varid'>indent</span>
<a name="line-219"></a> <span class='hs-varop'>||</span> <span class='hs-varid'>not</span> <span class='hs-varid'>dob</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>loc</span> <span class='hs-varop'><=</span> <span class='hs-varid'>indent</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>pushCtxtFlag</span>
<a name="line-220"></a> <span class='hs-varid'>pushContext</span> <span class='hs-layout'>(</span><span class='hs-conid'>Layout</span> <span class='hs-varid'>loc</span><span class='hs-layout'>)</span>
<a name="line-221"></a>
<a name="line-222"></a><a name="currentIndent"></a><span class='hs-definition'>currentIndent</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-conid'>Int</span>
<a name="line-223"></a><span class='hs-definition'>currentIndent</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_r</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>stk</span> <span class='hs-sel'>_mode</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ok</span> <span class='hs-varid'>stk</span> <span class='hs-layout'>(</span><span class='hs-varid'>indentOfParseState</span> <span class='hs-varid'>stk</span><span class='hs-layout'>)</span>
<a name="line-224"></a>
<a name="line-225"></a><a name="pushContext"></a><span class='hs-definition'>pushContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LexContext</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>()</span>
<a name="line-226"></a><span class='hs-definition'>pushContext</span> <span class='hs-varid'>ctxt</span> <span class='hs-keyglyph'>=</span>
<a name="line-227"></a><span class='hs-comment'>--trace ("pushing lexical scope: " ++ show ctxt ++"\n") $</span>
<a name="line-228"></a> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ok</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctxt</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span>
<a name="line-229"></a>
<a name="line-230"></a><a name="popContext"></a><span class='hs-definition'>popContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-conid'>()</span>
<a name="line-231"></a><span class='hs-definition'>popContext</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-varid'>stk</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span>
<a name="line-232"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>stk</span> <span class='hs-keyword'>of</span>
<a name="line-233"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-comment'>--trace ("popping lexical scope, context now "++show s ++ "\n") $</span>
<a name="line-234"></a> <span class='hs-conid'>Ok</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span>
<a name="line-235"></a> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-str'>"Internal error: empty context in popContext"</span>
<a name="line-236"></a>
<a name="line-237"></a>
<a name="line-238"></a><a name="pushExtContext"></a><span class='hs-comment'>-- HaRP/Hsx</span>
<a name="line-239"></a><span class='hs-definition'>pushExtContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ExtContext</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-conid'>()</span>
<a name="line-240"></a><span class='hs-definition'>pushExtContext</span> <span class='hs-varid'>ctxt</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ok</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>ctxt</span><span class='hs-conop'>:</span><span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span>
<a name="line-241"></a>
<a name="line-242"></a><a name="popExtContext"></a><span class='hs-definition'>popExtContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-conid'>()</span>
<a name="line-243"></a><span class='hs-definition'>popExtContext</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span>
<a name="line-244"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>of</span>
<a name="line-245"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>e'</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-246"></a> <span class='hs-conid'>Ok</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e'</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span>
<a name="line-247"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-str'>"Internal error: empty context in popExtContext"</span>
<a name="line-248"></a>
<a name="line-249"></a>
<a name="line-250"></a><a name="getExtensions"></a><span class='hs-comment'>-- Extension-aware lexing/parsing</span>
<a name="line-251"></a><span class='hs-definition'>getExtensions</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Extension</span><span class='hs-keyglyph'>]</span>
<a name="line-252"></a><span class='hs-definition'>getExtensions</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span>
<a name="line-253"></a> <span class='hs-conid'>Ok</span> <span class='hs-varid'>s</span> <span class='hs-varop'>$</span> <span class='hs-varid'>extensions</span> <span class='hs-varid'>m</span>
<a name="line-254"></a>
<a name="line-255"></a><a name="pushCtxtFlag"></a><span class='hs-definition'>pushCtxtFlag</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-conid'>()</span>
<a name="line-256"></a><span class='hs-definition'>pushCtxtFlag</span> <span class='hs-keyglyph'>=</span>
<a name="line-257"></a> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>of</span>
<a name="line-258"></a> <span class='hs-conid'>False</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ok</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span><span class='hs-conid'>True</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-conid'>()</span>
<a name="line-259"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-str'>"Internal error: context flag already pushed"</span>
<a name="line-260"></a>
<a name="line-261"></a><a name="pullDoStatus"></a><span class='hs-definition'>pullDoStatus</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>P</span> <span class='hs-conid'>Bool</span>
<a name="line-262"></a><span class='hs-definition'>pullDoStatus</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_i</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-sel'>_l</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-sel'>_m</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Ok</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>e</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-varid'>d</span>
<a name="line-263"></a>
<a name="line-264"></a>
<a name="line-265"></a><span class='hs-comment'>----------------------------------------------------------------------------</span>
<a name="line-266"></a><span class='hs-comment'>-- Monad for lexical analysis:</span>
<a name="line-267"></a><span class='hs-comment'>-- a continuation-passing version of the parsing monad</span>
<a name="line-268"></a>
<a name="line-269"></a><a name="Lex"></a><span class='hs-keyword'>newtype</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>r</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-layout'>{</span> <span class='hs-varid'>runL</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>r</span> <span class='hs-layout'>}</span>
<a name="line-270"></a>
<a name="line-271"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Monad</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lex</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-272"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>k</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>k</span> <span class='hs-varid'>a</span>
<a name="line-273"></a> <span class='hs-conid'>Lex</span> <span class='hs-varid'>v</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>f</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>k</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>v</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runL</span> <span class='hs-layout'>(</span><span class='hs-varid'>f</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-274"></a> <span class='hs-conid'>Lex</span> <span class='hs-varid'>v</span> <span class='hs-varop'>>></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>k</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>v</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>w</span> <span class='hs-varid'>k</span><span class='hs-layout'>)</span>
<a name="line-275"></a> <span class='hs-varid'>fail</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-varid'>s</span>
<a name="line-276"></a>
<a name="line-277"></a><span class='hs-comment'>-- Operations on this monad</span>
<a name="line-278"></a>
<a name="line-279"></a><a name="getInput"></a><span class='hs-definition'>getInput</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>r</span> <span class='hs-conid'>String</span>
<a name="line-280"></a><span class='hs-definition'>getInput</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span>
<a name="line-281"></a>
<a name="line-282"></a><span class='hs-comment'>-- | Discard some input characters (these must not include tabs or newlines).</span>
<a name="line-283"></a>
<a name="line-284"></a><a name="discard"></a><span class='hs-definition'>discard</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>r</span> <span class='hs-conid'>()</span>
<a name="line-285"></a><span class='hs-definition'>discard</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>drop</span> <span class='hs-varid'>n</span> <span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-varop'>+</span><span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-286"></a>
<a name="line-287"></a><span class='hs-comment'>-- | Discard the next character, which must be a newline.</span>
<a name="line-288"></a>
<a name="line-289"></a><a name="lexNewline"></a><span class='hs-definition'>lexNewline</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-290"></a><span class='hs-definition'>lexNewline</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-sel'>_x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-num'>1</span> <span class='hs-layout'>(</span><span class='hs-varid'>y</span><span class='hs-varop'>+</span><span class='hs-num'>1</span><span class='hs-layout'>)</span>
<a name="line-291"></a>
<a name="line-292"></a><span class='hs-comment'>-- | Discard the next character, which must be a tab.</span>
<a name="line-293"></a>
<a name="line-294"></a><a name="lexTab"></a><span class='hs-definition'>lexTab</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-295"></a><span class='hs-definition'>lexTab</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>r</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>nextTab</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-296"></a>
<a name="line-297"></a><a name="nextTab"></a><span class='hs-definition'>nextTab</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span>
<a name="line-298"></a><span class='hs-definition'>nextTab</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-varop'>+</span> <span class='hs-layout'>(</span><span class='hs-varid'>tAB_LENGTH</span> <span class='hs-comment'>-</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-comment'>-</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>`mod`</span> <span class='hs-varid'>tAB_LENGTH</span><span class='hs-layout'>)</span>
<a name="line-299"></a>
<a name="line-300"></a><a name="tAB_LENGTH"></a><span class='hs-definition'>tAB_LENGTH</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-301"></a><span class='hs-definition'>tAB_LENGTH</span> <span class='hs-keyglyph'>=</span> <span class='hs-num'>8</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span>
<a name="line-302"></a>
<a name="line-303"></a><span class='hs-comment'>-- Consume and return the largest string of characters satisfying p</span>
<a name="line-304"></a>
<a name="line-305"></a><a name="lexWhile"></a><span class='hs-definition'>lexWhile</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>String</span>
<a name="line-306"></a><span class='hs-definition'>lexWhile</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>-></span>
<a name="line-307"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>cs</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>p</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>in</span>
<a name="line-308"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-varid'>rest</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span> <span class='hs-varop'>+</span> <span class='hs-varid'>length</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-309"></a>
<a name="line-310"></a><span class='hs-comment'>-- An alternative scan, to which we can return if subsequent scanning</span>
<a name="line-311"></a><span class='hs-comment'>-- is unsuccessful.</span>
<a name="line-312"></a>
<a name="line-313"></a><a name="alternative"></a><span class='hs-definition'>alternative</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-varid'>v</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span>
<a name="line-314"></a><span class='hs-definition'>alternative</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lex</span> <span class='hs-varid'>v</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>-></span>
<a name="line-315"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-layout'>(</span><span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-sel'>_r</span> <span class='hs-sel'>_x</span> <span class='hs-sel'>_y</span> <span class='hs-keyglyph'>-></span>
<a name="line-316"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>v</span> <span class='hs-varid'>cont'</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-317"></a>
<a name="line-318"></a><span class='hs-comment'>-- The source location is the coordinates of the previous token,</span>
<a name="line-319"></a><span class='hs-comment'>-- or, while scanning a token, the start of the current token.</span>
<a name="line-320"></a>
<a name="line-321"></a><span class='hs-comment'>-- col is the current column in the source file.</span>
<a name="line-322"></a><span class='hs-comment'>-- We also need to remember between scanning tokens whether we are</span>
<a name="line-323"></a><span class='hs-comment'>-- somewhere at the beginning of the line before the first token.</span>
<a name="line-324"></a><span class='hs-comment'>-- This could be done with an extra Bool argument to the P monad,</span>
<a name="line-325"></a><span class='hs-comment'>-- but as a hack we use a col value of 0 to indicate this situation.</span>
<a name="line-326"></a>
<a name="line-327"></a><span class='hs-comment'>-- Setting col to 0 is used in two places: just after emitting a virtual</span>
<a name="line-328"></a><span class='hs-comment'>-- close brace due to layout, so that next time through we check whether</span>
<a name="line-329"></a><span class='hs-comment'>-- we also need to emit a semi-colon, and at the beginning of the file,</span>
<a name="line-330"></a><span class='hs-comment'>-- by runParser, to kick off the lexer.</span>
<a name="line-331"></a><span class='hs-comment'>-- Thus when col is zero, the true column can be taken from the loc.</span>
<a name="line-332"></a>
<a name="line-333"></a><a name="checkBOL"></a><span class='hs-definition'>checkBOL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Bool</span>
<a name="line-334"></a><span class='hs-definition'>checkBOL</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-keyglyph'>-></span>
<a name="line-335"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>x</span> <span class='hs-varop'>==</span> <span class='hs-num'>0</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-layout'>(</span><span class='hs-varid'>srcColumn</span> <span class='hs-varid'>loc</span><span class='hs-layout'>)</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span>
<a name="line-336"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span>
<a name="line-337"></a>
<a name="line-338"></a><a name="setBOL"></a><span class='hs-definition'>setBOL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-339"></a><span class='hs-definition'>setBOL</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-num'>0</span>
<a name="line-340"></a>
<a name="line-341"></a><span class='hs-comment'>-- Set the loc to the current position</span>
<a name="line-342"></a>
<a name="line-343"></a><a name="startToken"></a><span class='hs-definition'>startToken</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-344"></a><span class='hs-definition'>startToken</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>stk</span> <span class='hs-varid'>mode</span> <span class='hs-keyglyph'>-></span>
<a name="line-345"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>loc</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>SrcLoc</span> <span class='hs-layout'>{</span>
<a name="line-346"></a> <span class='hs-varid'>srcFilename</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseFilename</span> <span class='hs-varid'>mode</span><span class='hs-layout'>,</span>
<a name="line-347"></a> <span class='hs-varid'>srcLine</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span>
<a name="line-348"></a> <span class='hs-varid'>srcColumn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span>
<a name="line-349"></a> <span class='hs-layout'>}</span> <span class='hs-keyword'>in</span>
<a name="line-350"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>stk</span> <span class='hs-varid'>mode</span>
<a name="line-351"></a>
<a name="line-352"></a><span class='hs-comment'>-- Current status with respect to the offside (layout) rule:</span>
<a name="line-353"></a><span class='hs-comment'>-- LT: we are to the left of the current indent (if any)</span>
<a name="line-354"></a><span class='hs-comment'>-- EQ: we are at the current indent (if any)</span>
<a name="line-355"></a><span class='hs-comment'>-- GT: we are to the right of the current indent, or not subject to layout</span>
<a name="line-356"></a>
<a name="line-357"></a><a name="getOffside"></a><span class='hs-definition'>getOffside</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Ordering</span>
<a name="line-358"></a><span class='hs-definition'>getOffside</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>stk</span> <span class='hs-keyglyph'>-></span>
<a name="line-359"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-layout'>(</span><span class='hs-varid'>compare</span> <span class='hs-varid'>x</span> <span class='hs-layout'>(</span><span class='hs-varid'>indentOfParseState</span> <span class='hs-varid'>stk</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>stk</span>
<a name="line-360"></a>
<a name="line-361"></a><a name="getSrcLocL"></a><span class='hs-definition'>getSrcLocL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>SrcLoc</span>
<a name="line-362"></a><span class='hs-definition'>getSrcLocL</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span> <span class='hs-keyglyph'>-></span>
<a name="line-363"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-layout'>(</span><span class='hs-varid'>l</span> <span class='hs-layout'>{</span> <span class='hs-varid'>srcLine</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>y</span><span class='hs-layout'>,</span> <span class='hs-varid'>srcColumn</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>x</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>l</span>
<a name="line-364"></a>
<a name="line-365"></a><a name="setSrcLineL"></a><span class='hs-definition'>setSrcLineL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-366"></a><span class='hs-definition'>setSrcLineL</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span>
<a name="line-367"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>i</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span>
<a name="line-368"></a>
<a name="line-369"></a><a name="pushContextL"></a><span class='hs-definition'>pushContextL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>LexContext</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-370"></a><span class='hs-definition'>pushContextL</span> <span class='hs-varid'>ctxt</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>stk</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>pst</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-371"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctxt</span><span class='hs-conop'>:</span><span class='hs-varid'>stk</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>pst</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-372"></a>
<a name="line-373"></a><a name="popContextL"></a><span class='hs-definition'>popContextL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-374"></a><span class='hs-definition'>popContextL</span> <span class='hs-varid'>fn</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>stk</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>stk</span> <span class='hs-keyword'>of</span>
<a name="line-375"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>ctxt</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>pst</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>ctxt</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>pst</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-376"></a> <span class='hs-layout'>(</span><span class='hs-conid'>[]</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-layout'>(</span><span class='hs-str'>"Internal error: empty context in "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>fn</span><span class='hs-layout'>)</span>
<a name="line-377"></a>
<a name="line-378"></a><a name="pullCtxtFlag"></a><span class='hs-definition'>pullCtxtFlag</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Bool</span>
<a name="line-379"></a><span class='hs-definition'>pullCtxtFlag</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>ct</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-380"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>ct</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span><span class='hs-conid'>False</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-381"></a>
<a name="line-382"></a>
<a name="line-383"></a><a name="flagDo"></a><span class='hs-definition'>flagDo</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-384"></a><span class='hs-definition'>flagDo</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>ct</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-385"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>ct</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-conid'>True</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-386"></a>
<a name="line-387"></a>
<a name="line-388"></a><span class='hs-comment'>-- Harp/Hsx</span>
<a name="line-389"></a>
<a name="line-390"></a><a name="getExtContext"></a><span class='hs-definition'>getExtContext</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>ExtContext</span><span class='hs-layout'>)</span>
<a name="line-391"></a><span class='hs-definition'>getExtContext</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>stk</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>,</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-392"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>me</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>of</span>
<a name="line-393"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Nothing</span>
<a name="line-394"></a> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-varid'>c</span>
<a name="line-395"></a> <span class='hs-keyword'>in</span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-varid'>me</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>stk</span>
<a name="line-396"></a>
<a name="line-397"></a><a name="pushExtContextL"></a><span class='hs-definition'>pushExtContextL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>ExtContext</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-398"></a><span class='hs-definition'>pushExtContextL</span> <span class='hs-varid'>ec</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-399"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>ec</span><span class='hs-conop'>:</span><span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-400"></a>
<a name="line-401"></a><a name="popExtContextL"></a><span class='hs-definition'>popExtContextL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-402"></a><span class='hs-definition'>popExtContextL</span> <span class='hs-varid'>fn</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>stk</span><span class='hs-keyglyph'>@</span><span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>e</span><span class='hs-layout'>,</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>e</span> <span class='hs-keyword'>of</span>
<a name="line-403"></a> <span class='hs-layout'>(</span><span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-varid'>ec</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span><span class='hs-varid'>ec</span><span class='hs-layout'>,</span><span class='hs-varid'>p</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-404"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-layout'>(</span><span class='hs-str'>"Internal error: empty tag context in "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>fn</span><span class='hs-layout'>)</span>
<a name="line-405"></a>
<a name="line-406"></a>
<a name="line-407"></a><span class='hs-comment'>-- Extension-aware lexing</span>
<a name="line-408"></a>
<a name="line-409"></a><a name="getExtensionsL"></a><span class='hs-definition'>getExtensionsL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Extension</span><span class='hs-keyglyph'>]</span>
<a name="line-410"></a><span class='hs-definition'>getExtensionsL</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span>
<a name="line-411"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-varop'>$</span> <span class='hs-varid'>extensions</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span>
<a name="line-412"></a>
<a name="line-413"></a><span class='hs-comment'>-- LINE-aware lexing</span>
<a name="line-414"></a>
<a name="line-415"></a><a name="ignoreLinePragmasL"></a><span class='hs-definition'>ignoreLinePragmasL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Bool</span>
<a name="line-416"></a><span class='hs-definition'>ignoreLinePragmasL</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span>
<a name="line-417"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-varop'>$</span> <span class='hs-varid'>ignoreLinePragmas</span> <span class='hs-varid'>m</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span>
<a name="line-418"></a>
<a name="line-419"></a><a name="setLineFilenameL"></a><span class='hs-comment'>-- If we read a file name in a LINE pragma, we should update the state.</span>
<a name="line-420"></a><span class='hs-definition'>setLineFilenameL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-421"></a><span class='hs-definition'>setLineFilenameL</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>s</span> <span class='hs-varid'>m</span> <span class='hs-keyglyph'>-></span>
<a name="line-422"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-varid'>m</span> <span class='hs-layout'>{</span><span class='hs-varid'>parseFilename</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>name</span><span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-423"></a>
<a name="line-424"></a><span class='hs-comment'>-- Comments</span>
<a name="line-425"></a>
<a name="line-426"></a><a name="pushComment"></a><span class='hs-definition'>pushComment</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Comment</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>()</span>
<a name="line-427"></a><span class='hs-definition'>pushComment</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Lex</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>cont</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varop'>$</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</span><span class='hs-layout'>,</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-428"></a> <span class='hs-varid'>runP</span> <span class='hs-layout'>(</span><span class='hs-varid'>cont</span> <span class='hs-conid'>()</span><span class='hs-layout'>)</span> <span class='hs-varid'>r</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>loc</span> <span class='hs-layout'>(</span><span class='hs-varid'>s</span><span class='hs-layout'>,</span> <span class='hs-varid'>e</span><span class='hs-layout'>,</span> <span class='hs-varid'>p</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>
</pre></body>
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