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<pre><a name="line-1"></a><span class='hs-comment'>-- #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.Lexer</span>
<a name="line-5"></a><span class='hs-comment'>-- Copyright : (c) The GHC Team, 1997-2000</span>
<a name="line-6"></a><span class='hs-comment'>-- License : BSD-style (see the file libraries/base/LICENSE)</span>
<a name="line-7"></a><span class='hs-comment'>-- </span>
<a name="line-8"></a><span class='hs-comment'>-- Maintainer : libraries@haskell.org</span>
<a name="line-9"></a><span class='hs-comment'>-- Stability : experimental</span>
<a name="line-10"></a><span class='hs-comment'>-- Portability : portable</span>
<a name="line-11"></a><span class='hs-comment'>--</span>
<a name="line-12"></a><span class='hs-comment'>-- Lexer for Haskell.</span>
<a name="line-13"></a><span class='hs-comment'>--</span>
<a name="line-14"></a><span class='hs-comment'>-----------------------------------------------------------------------------</span>
<a name="line-15"></a>
<a name="line-16"></a><span class='hs-comment'>-- ToDo: Introduce different tokens for decimal, octal and hexadecimal (?)</span>
<a name="line-17"></a><span class='hs-comment'>-- ToDo: FloatTok should have three parts (integer part, fraction, exponent) (?)</span>
<a name="line-18"></a><span class='hs-comment'>-- ToDo: Use a lexical analyser generator (lx?)</span>
<a name="line-19"></a>
<a name="line-20"></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'>Lexer</span> <span class='hs-layout'>(</span><span class='hs-conid'>Token</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'>lexer</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-21"></a>
<a name="line-22"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Language</span><span class='hs-varop'>.</span><span class='hs-conid'>Haskell</span><span class='hs-varop'>.</span><span class='hs-conid'>ParseMonad</span>
<a name="line-23"></a>
<a name="line-24"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>isAlpha</span><span class='hs-layout'>,</span> <span class='hs-varid'>isLower</span><span class='hs-layout'>,</span> <span class='hs-varid'>isUpper</span><span class='hs-layout'>,</span> <span class='hs-varid'>toLower</span><span class='hs-layout'>,</span>
<a name="line-25"></a> <span class='hs-varid'>isDigit</span><span class='hs-layout'>,</span> <span class='hs-varid'>isHexDigit</span><span class='hs-layout'>,</span> <span class='hs-varid'>isOctDigit</span><span class='hs-layout'>,</span> <span class='hs-varid'>isSpace</span><span class='hs-layout'>,</span>
<a name="line-26"></a> <span class='hs-varid'>ord</span><span class='hs-layout'>,</span> <span class='hs-varid'>chr</span><span class='hs-layout'>,</span> <span class='hs-varid'>digitToInt</span><span class='hs-layout'>)</span>
<a name="line-27"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>isSymbol</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Ratio</span>
<a name="line-29"></a>
<a name="line-30"></a><a name="Token"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>Token</span>
<a name="line-31"></a> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>VarId</span> <span class='hs-conid'>String</span>
<a name="line-32"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>QVarId</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-33"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ConId</span> <span class='hs-conid'>String</span>
<a name="line-34"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>QConId</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-35"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>VarSym</span> <span class='hs-conid'>String</span>
<a name="line-36"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>ConSym</span> <span class='hs-conid'>String</span>
<a name="line-37"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>QVarSym</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-38"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>QConSym</span> <span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>String</span><span class='hs-layout'>)</span>
<a name="line-39"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>IntTok</span> <span class='hs-conid'>Integer</span>
<a name="line-40"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>FloatTok</span> <span class='hs-conid'>Rational</span>
<a name="line-41"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Character</span> <span class='hs-conid'>Char</span>
<a name="line-42"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>StringTok</span> <span class='hs-conid'>String</span>
<a name="line-43"></a>
<a name="line-44"></a><span class='hs-comment'>-- Symbols</span>
<a name="line-45"></a>
<a name="line-46"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>LeftParen</span>
<a name="line-47"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RightParen</span>
<a name="line-48"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>SemiColon</span>
<a name="line-49"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>LeftCurly</span>
<a name="line-50"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RightCurly</span>
<a name="line-51"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>VRightCurly</span> <span class='hs-comment'>-- a virtual close brace</span>
<a name="line-52"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>LeftSquare</span>
<a name="line-53"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RightSquare</span>
<a name="line-54"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Comma</span>
<a name="line-55"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Underscore</span>
<a name="line-56"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BackQuote</span>
<a name="line-57"></a>
<a name="line-58"></a><span class='hs-comment'>-- Reserved operators</span>
<a name="line-59"></a>
<a name="line-60"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DotDot</span>
<a name="line-61"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Colon</span>
<a name="line-62"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DoubleColon</span>
<a name="line-63"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Equals</span>
<a name="line-64"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Backslash</span>
<a name="line-65"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Bar</span>
<a name="line-66"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>LeftArrow</span>
<a name="line-67"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>RightArrow</span>
<a name="line-68"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>At</span>
<a name="line-69"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Tilde</span>
<a name="line-70"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>DoubleArrow</span>
<a name="line-71"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Minus</span>
<a name="line-72"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>Exclamation</span>
<a name="line-73"></a>
<a name="line-74"></a><span class='hs-comment'>-- Reserved Ids</span>
<a name="line-75"></a>
<a name="line-76"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Case</span>
<a name="line-77"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Class</span>
<a name="line-78"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Data</span>
<a name="line-79"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Default</span>
<a name="line-80"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Deriving</span>
<a name="line-81"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Do</span>
<a name="line-82"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Else</span>
<a name="line-83"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Foreign</span>
<a name="line-84"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_If</span>
<a name="line-85"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Import</span>
<a name="line-86"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_In</span>
<a name="line-87"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Infix</span>
<a name="line-88"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_InfixL</span>
<a name="line-89"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_InfixR</span>
<a name="line-90"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Instance</span>
<a name="line-91"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Let</span>
<a name="line-92"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Module</span>
<a name="line-93"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_NewType</span>
<a name="line-94"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Of</span>
<a name="line-95"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Then</span>
<a name="line-96"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Type</span>
<a name="line-97"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Where</span>
<a name="line-98"></a>
<a name="line-99"></a><span class='hs-comment'>-- Special Ids</span>
<a name="line-100"></a>
<a name="line-101"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_As</span>
<a name="line-102"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Export</span>
<a name="line-103"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Hiding</span>
<a name="line-104"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Qualified</span>
<a name="line-105"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Safe</span>
<a name="line-106"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>KW_Unsafe</span>
<a name="line-107"></a>
<a name="line-108"></a> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>EOF</span>
<a name="line-109"></a> <span class='hs-keyword'>deriving</span> <span class='hs-layout'>(</span><span class='hs-conid'>Eq</span><span class='hs-layout'>,</span><span class='hs-conid'>Show</span><span class='hs-layout'>)</span>
<a name="line-110"></a>
<a name="line-111"></a><a name="reserved_ops"></a><span class='hs-definition'>reserved_ops</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>Token</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-112"></a><span class='hs-definition'>reserved_ops</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span>
<a name="line-113"></a> <span class='hs-layout'>(</span> <span class='hs-str'>".."</span><span class='hs-layout'>,</span> <span class='hs-conid'>DotDot</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-114"></a> <span class='hs-layout'>(</span> <span class='hs-str'>":"</span><span class='hs-layout'>,</span> <span class='hs-conid'>Colon</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-115"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"::"</span><span class='hs-layout'>,</span> <span class='hs-conid'>DoubleColon</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-116"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"="</span><span class='hs-layout'>,</span> <span class='hs-conid'>Equals</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-117"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"\\"</span><span class='hs-layout'>,</span> <span class='hs-conid'>Backslash</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-118"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"|"</span><span class='hs-layout'>,</span> <span class='hs-conid'>Bar</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-119"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"<-"</span><span class='hs-layout'>,</span> <span class='hs-conid'>LeftArrow</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-120"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"->"</span><span class='hs-layout'>,</span> <span class='hs-conid'>RightArrow</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-121"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"@"</span><span class='hs-layout'>,</span> <span class='hs-conid'>At</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-122"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"~"</span><span class='hs-layout'>,</span> <span class='hs-conid'>Tilde</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-123"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"=>"</span><span class='hs-layout'>,</span> <span class='hs-conid'>DoubleArrow</span> <span class='hs-layout'>)</span>
<a name="line-124"></a> <span class='hs-keyglyph'>]</span>
<a name="line-125"></a>
<a name="line-126"></a><a name="special_varops"></a><span class='hs-definition'>special_varops</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>Token</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-127"></a><span class='hs-definition'>special_varops</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span>
<a name="line-128"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"-"</span><span class='hs-layout'>,</span> <span class='hs-conid'>Minus</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-comment'>--ToDo: shouldn't be here</span>
<a name="line-129"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"!"</span><span class='hs-layout'>,</span> <span class='hs-conid'>Exclamation</span> <span class='hs-layout'>)</span> <span class='hs-varop'>--ditto</span>
<a name="line-130"></a> <span class='hs-keyglyph'>]</span>
<a name="line-131"></a>
<a name="line-132"></a><a name="reserved_ids"></a><span class='hs-definition'>reserved_ids</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>Token</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-133"></a><span class='hs-definition'>reserved_ids</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span>
<a name="line-134"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"_"</span><span class='hs-layout'>,</span> <span class='hs-conid'>Underscore</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-135"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"case"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Case</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-136"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"class"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Class</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-137"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"data"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Data</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-138"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"default"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Default</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-139"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"deriving"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Deriving</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-140"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"do"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Do</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-141"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"else"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Else</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-142"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"foreign"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Foreign</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-143"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"if"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_If</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-144"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"import"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Import</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-145"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"in"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_In</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-146"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"infix"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Infix</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-147"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"infixl"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_InfixL</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-148"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"infixr"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_InfixR</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-149"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"instance"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Instance</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-150"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"let"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Let</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-151"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"module"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Module</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-152"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"newtype"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_NewType</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-153"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"of"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Of</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-154"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"then"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Then</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-155"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"type"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Type</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-156"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"where"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Where</span> <span class='hs-layout'>)</span>
<a name="line-157"></a> <span class='hs-keyglyph'>]</span>
<a name="line-158"></a>
<a name="line-159"></a><a name="special_varids"></a><span class='hs-definition'>special_varids</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-conid'>String</span><span class='hs-layout'>,</span><span class='hs-conid'>Token</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-160"></a><span class='hs-definition'>special_varids</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span>
<a name="line-161"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"as"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_As</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-162"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"export"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Export</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-163"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"hiding"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Hiding</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-164"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"qualified"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Qualified</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-165"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"safe"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Safe</span> <span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-166"></a> <span class='hs-layout'>(</span> <span class='hs-str'>"unsafe"</span><span class='hs-layout'>,</span> <span class='hs-conid'>KW_Unsafe</span> <span class='hs-layout'>)</span>
<a name="line-167"></a> <span class='hs-keyglyph'>]</span>
<a name="line-168"></a>
<a name="line-169"></a><a name="isIdent"></a><span class='hs-definition'>isIdent</span><span class='hs-layout'>,</span> <span class='hs-varid'>isSymbol</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span>
<a name="line-170"></a><span class='hs-definition'>isIdent</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isAlpha</span> <span class='hs-varid'>c</span> <span class='hs-varop'>||</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>c</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'\''</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'_'</span>
<a name="line-171"></a><a name="isSymbol"></a><span class='hs-definition'>isSymbol</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>c</span> <span class='hs-varop'>`elem`</span> <span class='hs-str'>":!#%&*./?@\\-"</span> <span class='hs-varop'>||</span> <span class='hs-layout'>(</span><span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Char</span><span class='hs-varop'>.</span><span class='hs-varid'>isSymbol</span> <span class='hs-varid'>c</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>not</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>`elem`</span> <span class='hs-str'>"(),;[]`{}_\"'"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-172"></a>
<a name="line-173"></a><a name="matchChar"></a><span class='hs-definition'>matchChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</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-174"></a><span class='hs-definition'>matchChar</span> <span class='hs-varid'>c</span> <span class='hs-varid'>msg</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-175"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-176"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>s</span> <span class='hs-varop'>||</span> <span class='hs-varid'>head</span> <span class='hs-varid'>s</span> <span class='hs-varop'>/=</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>fail</span> <span class='hs-varid'>msg</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-177"></a>
<a name="line-178"></a><span class='hs-comment'>-- The top-level lexer.</span>
<a name="line-179"></a><span class='hs-comment'>-- We need to know whether we are at the beginning of the line to decide</span>
<a name="line-180"></a><span class='hs-comment'>-- whether to insert layout tokens.</span>
<a name="line-181"></a>
<a name="line-182"></a><a name="lexer"></a><span class='hs-definition'>lexer</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Token</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>P</span> <span class='hs-varid'>a</span>
<a name="line-183"></a><span class='hs-definition'>lexer</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runL</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-184"></a> <span class='hs-varid'>bol</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>checkBOL</span>
<a name="line-185"></a> <span class='hs-varid'>bol</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhiteSpace</span> <span class='hs-varid'>bol</span>
<a name="line-186"></a> <span class='hs-varid'>startToken</span>
<a name="line-187"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>bol</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>lexBOL</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>lexToken</span>
<a name="line-188"></a>
<a name="line-189"></a><a name="lexWhiteSpace"></a><span class='hs-definition'>lexWhiteSpace</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</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-190"></a><span class='hs-definition'>lexWhiteSpace</span> <span class='hs-varid'>bol</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-191"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-192"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-193"></a> <span class='hs-chr'>'{'</span><span class='hs-conop'>:</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-194"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span>
<a name="line-195"></a> <span class='hs-varid'>bol</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexNestedComment</span> <span class='hs-varid'>bol</span>
<a name="line-196"></a> <span class='hs-varid'>lexWhiteSpace</span> <span class='hs-varid'>bol</span>
<a name="line-197"></a> <span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-varid'>rest</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>all</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-chr'>'-'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>takeWhile</span> <span class='hs-varid'>isSymbol</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-198"></a> <span class='hs-varid'>lexWhile</span> <span class='hs-layout'>(</span><span class='hs-varop'>==</span> <span class='hs-chr'>'-'</span><span class='hs-layout'>)</span>
<a name="line-199"></a> <span class='hs-varid'>lexWhile</span> <span class='hs-layout'>(</span><span class='hs-varop'>/=</span> <span class='hs-chr'>'\n'</span><span class='hs-layout'>)</span>
<a name="line-200"></a> <span class='hs-varid'>s'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-201"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>s'</span> <span class='hs-keyword'>of</span>
<a name="line-202"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Unterminated end-of-line comment"</span>
<a name="line-203"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-204"></a> <span class='hs-varid'>lexNewline</span>
<a name="line-205"></a> <span class='hs-varid'>lexWhiteSpace</span> <span class='hs-conid'>True</span>
<a name="line-206"></a> <span class='hs-chr'>'\n'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-207"></a> <span class='hs-varid'>lexNewline</span>
<a name="line-208"></a> <span class='hs-varid'>lexWhiteSpace</span> <span class='hs-conid'>True</span>
<a name="line-209"></a> <span class='hs-chr'>'\t'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-210"></a> <span class='hs-varid'>lexTab</span>
<a name="line-211"></a> <span class='hs-varid'>lexWhiteSpace</span> <span class='hs-varid'>bol</span>
<a name="line-212"></a> <span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-213"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-214"></a> <span class='hs-varid'>lexWhiteSpace</span> <span class='hs-varid'>bol</span>
<a name="line-215"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>bol</span>
<a name="line-216"></a>
<a name="line-217"></a><a name="lexNestedComment"></a><span class='hs-definition'>lexNestedComment</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</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-218"></a><span class='hs-definition'>lexNestedComment</span> <span class='hs-varid'>bol</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-219"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-220"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-221"></a> <span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-chr'>'}'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-varid'>bol</span>
<a name="line-222"></a> <span class='hs-chr'>'{'</span><span class='hs-conop'>:</span><span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-223"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span>
<a name="line-224"></a> <span class='hs-varid'>bol</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexNestedComment</span> <span class='hs-varid'>bol</span> <span class='hs-comment'>-- rest of the subcomment</span>
<a name="line-225"></a> <span class='hs-varid'>lexNestedComment</span> <span class='hs-varid'>bol</span> <span class='hs-comment'>-- rest of this comment</span>
<a name="line-226"></a> <span class='hs-chr'>'\t'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexTab</span> <span class='hs-varop'>>></span> <span class='hs-varid'>lexNestedComment</span> <span class='hs-varid'>bol</span>
<a name="line-227"></a> <span class='hs-chr'>'\n'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexNewline</span> <span class='hs-varop'>>></span> <span class='hs-varid'>lexNestedComment</span> <span class='hs-conid'>True</span>
<a name="line-228"></a> <span class='hs-keyword'>_</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>lexNestedComment</span> <span class='hs-varid'>bol</span>
<a name="line-229"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Unterminated nested comment"</span>
<a name="line-230"></a>
<a name="line-231"></a><span class='hs-comment'>-- When we are lexing the first token of a line, check whether we need to</span>
<a name="line-232"></a><span class='hs-comment'>-- insert virtual semicolons or close braces due to layout.</span>
<a name="line-233"></a>
<a name="line-234"></a><a name="lexBOL"></a><span class='hs-definition'>lexBOL</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Token</span>
<a name="line-235"></a><span class='hs-definition'>lexBOL</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-236"></a> <span class='hs-varid'>pos</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getOffside</span>
<a name="line-237"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>pos</span> <span class='hs-keyword'>of</span>
<a name="line-238"></a> <span class='hs-conid'>LT</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-239"></a> <span class='hs-comment'>-- trace "layout: inserting '}'\n" $</span>
<a name="line-240"></a> <span class='hs-comment'>-- Set col to 0, indicating that we're still at the</span>
<a name="line-241"></a> <span class='hs-comment'>-- beginning of the line, in case we need a semi-colon too.</span>
<a name="line-242"></a> <span class='hs-comment'>-- Also pop the context here, so that we don't insert</span>
<a name="line-243"></a> <span class='hs-comment'>-- another close brace before the parser can pop it.</span>
<a name="line-244"></a> <span class='hs-varid'>setBOL</span>
<a name="line-245"></a> <span class='hs-varid'>popContextL</span> <span class='hs-str'>"lexBOL"</span>
<a name="line-246"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>VRightCurly</span>
<a name="line-247"></a> <span class='hs-conid'>EQ</span> <span class='hs-keyglyph'>-></span>
<a name="line-248"></a> <span class='hs-comment'>-- trace "layout: inserting ';'\n" $</span>
<a name="line-249"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>SemiColon</span>
<a name="line-250"></a> <span class='hs-conid'>GT</span> <span class='hs-keyglyph'>-></span>
<a name="line-251"></a> <span class='hs-varid'>lexToken</span>
<a name="line-252"></a>
<a name="line-253"></a><a name="lexToken"></a><span class='hs-definition'>lexToken</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Token</span>
<a name="line-254"></a><span class='hs-definition'>lexToken</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-255"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-256"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-257"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>EOF</span>
<a name="line-258"></a>
<a name="line-259"></a> <span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>toLower</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'o'</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>isOctDigit</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-260"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span>
<a name="line-261"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexOctal</span>
<a name="line-262"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntTok</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-263"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>toLower</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'x'</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>isHexDigit</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-264"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span>
<a name="line-265"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexHexadecimal</span>
<a name="line-266"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntTok</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-267"></a>
<a name="line-268"></a> <span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexDecimalOrFloat</span>
<a name="line-269"></a>
<a name="line-270"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isUpper</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexConIdOrQual</span> <span class='hs-str'>""</span>
<a name="line-271"></a>
<a name="line-272"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isLower</span> <span class='hs-varid'>c</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'_'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-273"></a> <span class='hs-varid'>ident</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isIdent</span>
<a name="line-274"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>ident</span> <span class='hs-layout'>(</span><span class='hs-varid'>reserved_ids</span> <span class='hs-varop'>++</span> <span class='hs-varid'>special_varids</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-275"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>keyword</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>keyword</span>
<a name="line-276"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VarId</span> <span class='hs-varid'>ident</span>
<a name="line-277"></a>
<a name="line-278"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSymbol</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-279"></a> <span class='hs-varid'>sym</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isSymbol</span>
<a name="line-280"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>sym</span> <span class='hs-layout'>(</span><span class='hs-varid'>reserved_ops</span> <span class='hs-varop'>++</span> <span class='hs-varid'>special_varops</span><span class='hs-layout'>)</span> <span class='hs-keyword'>of</span>
<a name="line-281"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>t</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>t</span>
<a name="line-282"></a> <span class='hs-conid'>Nothing</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-283"></a> <span class='hs-chr'>':'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ConSym</span> <span class='hs-varid'>sym</span>
<a name="line-284"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>VarSym</span> <span class='hs-varid'>sym</span>
<a name="line-285"></a>
<a name="line-286"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-287"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-288"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>of</span>
<a name="line-289"></a>
<a name="line-290"></a> <span class='hs-comment'>-- First the special symbols</span>
<a name="line-291"></a> <span class='hs-chr'>'('</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>LeftParen</span>
<a name="line-292"></a> <span class='hs-chr'>')'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>RightParen</span>
<a name="line-293"></a> <span class='hs-chr'>','</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>Comma</span>
<a name="line-294"></a> <span class='hs-chr'>';'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>SemiColon</span>
<a name="line-295"></a> <span class='hs-chr'>'['</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>LeftSquare</span>
<a name="line-296"></a> <span class='hs-chr'>']'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>RightSquare</span>
<a name="line-297"></a> <span class='hs-chr'>'`'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>BackQuote</span>
<a name="line-298"></a> <span class='hs-chr'>'{'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-299"></a> <span class='hs-varid'>pushContextL</span> <span class='hs-conid'>NoLayout</span>
<a name="line-300"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>LeftCurly</span>
<a name="line-301"></a> <span class='hs-chr'>'}'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-302"></a> <span class='hs-varid'>popContextL</span> <span class='hs-str'>"lexToken"</span>
<a name="line-303"></a> <span class='hs-varid'>return</span> <span class='hs-conid'>RightCurly</span>
<a name="line-304"></a>
<a name="line-305"></a> <span class='hs-chr'>'\''</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-306"></a> <span class='hs-varid'>c2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexChar</span>
<a name="line-307"></a> <span class='hs-varid'>matchChar</span> <span class='hs-chr'>'\''</span> <span class='hs-str'>"Improperly terminated character constant"</span>
<a name="line-308"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Character</span> <span class='hs-varid'>c2</span><span class='hs-layout'>)</span>
<a name="line-309"></a>
<a name="line-310"></a> <span class='hs-chr'>'"'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexString</span>
<a name="line-311"></a>
<a name="line-312"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"Illegal character \'"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>c</span> <span class='hs-varop'>++</span> <span class='hs-str'>"\'\n"</span><span class='hs-layout'>)</span>
<a name="line-313"></a>
<a name="line-314"></a><a name="lexDecimalOrFloat"></a><span class='hs-definition'>lexDecimalOrFloat</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Token</span>
<a name="line-315"></a><span class='hs-definition'>lexDecimalOrFloat</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-316"></a> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isDigit</span>
<a name="line-317"></a> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-318"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>rest</span> <span class='hs-keyword'>of</span>
<a name="line-319"></a> <span class='hs-layout'>(</span><span class='hs-chr'>'.'</span><span class='hs-conop'>:</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-320"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-321"></a> <span class='hs-varid'>frac</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isDigit</span>
<a name="line-322"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>num</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseInteger</span> <span class='hs-num'>10</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span> <span class='hs-varop'>++</span> <span class='hs-varid'>frac</span><span class='hs-layout'>)</span>
<a name="line-323"></a> <span class='hs-varid'>decimals</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>toInteger</span> <span class='hs-layout'>(</span><span class='hs-varid'>length</span> <span class='hs-varid'>frac</span><span class='hs-layout'>)</span>
<a name="line-324"></a> <span class='hs-varid'>exponent</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>do</span>
<a name="line-325"></a> <span class='hs-varid'>rest2</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-326"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>rest2</span> <span class='hs-keyword'>of</span>
<a name="line-327"></a> <span class='hs-chr'>'e'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexExponent</span>
<a name="line-328"></a> <span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexExponent</span>
<a name="line-329"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-num'>0</span>
<a name="line-330"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>FloatTok</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>num</span><span class='hs-varop'>%</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>*</span> <span class='hs-num'>10</span><span class='hs-varop'>^^</span><span class='hs-layout'>(</span><span class='hs-varid'>exponent</span> <span class='hs-comment'>-</span> <span class='hs-varid'>decimals</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-331"></a> <span class='hs-varid'>e</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>toLower</span> <span class='hs-varid'>e</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'e'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-332"></a> <span class='hs-varid'>exponent</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexExponent</span>
<a name="line-333"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>FloatTok</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>parseInteger</span> <span class='hs-num'>10</span> <span class='hs-varid'>ds</span><span class='hs-varop'>%</span><span class='hs-num'>1</span><span class='hs-layout'>)</span> <span class='hs-varop'>*</span> <span class='hs-num'>10</span><span class='hs-varop'>^^</span><span class='hs-varid'>exponent</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-334"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>IntTok</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseInteger</span> <span class='hs-num'>10</span> <span class='hs-varid'>ds</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-335"></a>
<a name="line-336"></a> <span class='hs-keyword'>where</span>
<a name="line-337"></a> <span class='hs-varid'>lexExponent</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Integer</span>
<a name="line-338"></a> <span class='hs-varid'>lexExponent</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-339"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-comment'>-- 'e' or 'E'</span>
<a name="line-340"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-341"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-342"></a> <span class='hs-chr'>'+'</span><span class='hs-conop'>:</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-343"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-344"></a> <span class='hs-varid'>lexDecimal</span>
<a name="line-345"></a> <span class='hs-chr'>'-'</span><span class='hs-conop'>:</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-346"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-347"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexDecimal</span>
<a name="line-348"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>negate</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span>
<a name="line-349"></a> <span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexDecimal</span>
<a name="line-350"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Float with missing exponent"</span>
<a name="line-351"></a>
<a name="line-352"></a><a name="lexConIdOrQual"></a><span class='hs-definition'>lexConIdOrQual</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'>Token</span>
<a name="line-353"></a><span class='hs-definition'>lexConIdOrQual</span> <span class='hs-varid'>qual</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-354"></a> <span class='hs-varid'>con</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isIdent</span>
<a name="line-355"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>conid</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>qual</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>ConId</span> <span class='hs-varid'>con</span>
<a name="line-356"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>QConId</span> <span class='hs-layout'>(</span><span class='hs-varid'>qual</span><span class='hs-layout'>,</span><span class='hs-varid'>con</span><span class='hs-layout'>)</span>
<a name="line-357"></a> <span class='hs-varid'>qual'</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>null</span> <span class='hs-varid'>qual</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>con</span>
<a name="line-358"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>qual</span> <span class='hs-varop'>++</span> <span class='hs-chr'>'.'</span><span class='hs-conop'>:</span><span class='hs-varid'>con</span>
<a name="line-359"></a> <span class='hs-varid'>just_a_conid</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>alternative</span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-varid'>conid</span><span class='hs-layout'>)</span>
<a name="line-360"></a> <span class='hs-varid'>rest</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-361"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>rest</span> <span class='hs-keyword'>of</span>
<a name="line-362"></a> <span class='hs-chr'>'.'</span><span class='hs-conop'>:</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span>
<a name="line-363"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isLower</span> <span class='hs-varid'>c</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'_'</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-comment'>-- qualified varid?</span>
<a name="line-364"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-365"></a> <span class='hs-varid'>ident</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isIdent</span>
<a name="line-366"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>ident</span> <span class='hs-varid'>reserved_ids</span> <span class='hs-keyword'>of</span>
<a name="line-367"></a> <span class='hs-comment'>-- cannot qualify a reserved word</span>
<a name="line-368"></a> <span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>just_a_conid</span>
<a name="line-369"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>QVarId</span> <span class='hs-layout'>(</span><span class='hs-varid'>qual'</span><span class='hs-layout'>,</span> <span class='hs-varid'>ident</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-370"></a>
<a name="line-371"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isUpper</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-comment'>-- qualified conid?</span>
<a name="line-372"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-373"></a> <span class='hs-varid'>lexConIdOrQual</span> <span class='hs-varid'>qual'</span>
<a name="line-374"></a>
<a name="line-375"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSymbol</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-comment'>-- qualified symbol?</span>
<a name="line-376"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-377"></a> <span class='hs-varid'>sym</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isSymbol</span>
<a name="line-378"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>lookup</span> <span class='hs-varid'>sym</span> <span class='hs-varid'>reserved_ops</span> <span class='hs-keyword'>of</span>
<a name="line-379"></a> <span class='hs-comment'>-- cannot qualify a reserved operator</span>
<a name="line-380"></a> <span class='hs-conid'>Just</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>just_a_conid</span>
<a name="line-381"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>c</span> <span class='hs-keyword'>of</span>
<a name="line-382"></a> <span class='hs-chr'>':'</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QConSym</span> <span class='hs-layout'>(</span><span class='hs-varid'>qual'</span><span class='hs-layout'>,</span> <span class='hs-varid'>sym</span><span class='hs-layout'>)</span>
<a name="line-383"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>QVarSym</span> <span class='hs-layout'>(</span><span class='hs-varid'>qual'</span><span class='hs-layout'>,</span> <span class='hs-varid'>sym</span><span class='hs-layout'>)</span>
<a name="line-384"></a>
<a name="line-385"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>conid</span> <span class='hs-comment'>-- not a qualified thing</span>
<a name="line-386"></a>
<a name="line-387"></a><a name="lexChar"></a><span class='hs-definition'>lexChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Char</span>
<a name="line-388"></a><span class='hs-definition'>lexChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-389"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-390"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-391"></a> <span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>lexEscape</span>
<a name="line-392"></a> <span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-varid'>c</span>
<a name="line-393"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Incomplete character constant"</span>
<a name="line-394"></a>
<a name="line-395"></a><a name="lexString"></a><span class='hs-definition'>lexString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Token</span>
<a name="line-396"></a><span class='hs-definition'>lexString</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>loop</span> <span class='hs-str'>""</span>
<a name="line-397"></a> <span class='hs-keyword'>where</span>
<a name="line-398"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-399"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-400"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-401"></a> <span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'&'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-402"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span>
<a name="line-403"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span>
<a name="line-404"></a> <span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-405"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-406"></a> <span class='hs-varid'>lexWhiteChars</span>
<a name="line-407"></a> <span class='hs-varid'>matchChar</span> <span class='hs-chr'>'\\'</span> <span class='hs-str'>"Illegal character in string gap"</span>
<a name="line-408"></a> <span class='hs-varid'>loop</span> <span class='hs-varid'>s</span>
<a name="line-409"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-410"></a> <span class='hs-varid'>ce</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexEscape</span>
<a name="line-411"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>ce</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-412"></a> <span class='hs-chr'>'"'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-413"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-414"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>StringTok</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-415"></a> <span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-416"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-417"></a> <span class='hs-varid'>loop</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-418"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Improperly terminated string"</span>
<a name="line-419"></a>
<a name="line-420"></a> <span class='hs-varid'>lexWhiteChars</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-varid'>lexWhiteChars</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-422"></a> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-423"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-424"></a> <span class='hs-chr'>'\n'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-425"></a> <span class='hs-varid'>lexNewline</span>
<a name="line-426"></a> <span class='hs-varid'>lexWhiteChars</span>
<a name="line-427"></a> <span class='hs-chr'>'\t'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-428"></a> <span class='hs-varid'>lexTab</span>
<a name="line-429"></a> <span class='hs-varid'>lexWhiteChars</span>
<a name="line-430"></a> <span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-431"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-432"></a> <span class='hs-varid'>lexWhiteChars</span>
<a name="line-433"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-conid'>()</span>
<a name="line-434"></a>
<a name="line-435"></a><a name="lexEscape"></a><span class='hs-definition'>lexEscape</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Char</span>
<a name="line-436"></a><span class='hs-definition'>lexEscape</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-437"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-438"></a> <span class='hs-varid'>r</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getInput</span>
<a name="line-439"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>r</span> <span class='hs-keyword'>of</span>
<a name="line-440"></a>
<a name="line-441"></a><span class='hs-comment'>-- Production charesc from section B.2 (Note: \& is handled by caller)</span>
<a name="line-442"></a>
<a name="line-443"></a> <span class='hs-chr'>'a'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\a'</span>
<a name="line-444"></a> <span class='hs-chr'>'b'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\b'</span>
<a name="line-445"></a> <span class='hs-chr'>'f'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\f'</span>
<a name="line-446"></a> <span class='hs-chr'>'n'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\n'</span>
<a name="line-447"></a> <span class='hs-chr'>'r'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\r'</span>
<a name="line-448"></a> <span class='hs-chr'>'t'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\t'</span>
<a name="line-449"></a> <span class='hs-chr'>'v'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\v'</span>
<a name="line-450"></a> <span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\\'</span>
<a name="line-451"></a> <span class='hs-chr'>'"'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\"'</span>
<a name="line-452"></a> <span class='hs-chr'>'\''</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\''</span>
<a name="line-453"></a>
<a name="line-454"></a><span class='hs-comment'>-- Production ascii from section B.2</span>
<a name="line-455"></a>
<a name="line-456"></a> <span class='hs-chr'>'^'</span><span class='hs-conop'>:</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>cntrl</span> <span class='hs-varid'>c</span>
<a name="line-457"></a> <span class='hs-chr'>'N'</span><span class='hs-conop'>:</span><span class='hs-chr'>'U'</span><span class='hs-conop'>:</span><span class='hs-chr'>'L'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\NUL'</span>
<a name="line-458"></a> <span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-chr'>'O'</span><span class='hs-conop'>:</span><span class='hs-chr'>'H'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SOH'</span>
<a name="line-459"></a> <span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-chr'>'T'</span><span class='hs-conop'>:</span><span class='hs-chr'>'X'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\STX'</span>
<a name="line-460"></a> <span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-chr'>'T'</span><span class='hs-conop'>:</span><span class='hs-chr'>'X'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ETX'</span>
<a name="line-461"></a> <span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-chr'>'O'</span><span class='hs-conop'>:</span><span class='hs-chr'>'T'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\EOT'</span>
<a name="line-462"></a> <span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-chr'>'N'</span><span class='hs-conop'>:</span><span class='hs-chr'>'Q'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ENQ'</span>
<a name="line-463"></a> <span class='hs-chr'>'A'</span><span class='hs-conop'>:</span><span class='hs-chr'>'C'</span><span class='hs-conop'>:</span><span class='hs-chr'>'K'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ACK'</span>
<a name="line-464"></a> <span class='hs-chr'>'B'</span><span class='hs-conop'>:</span><span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-chr'>'L'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\BEL'</span>
<a name="line-465"></a> <span class='hs-chr'>'B'</span><span class='hs-conop'>:</span><span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\BS'</span>
<a name="line-466"></a> <span class='hs-chr'>'H'</span><span class='hs-conop'>:</span><span class='hs-chr'>'T'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\HT'</span>
<a name="line-467"></a> <span class='hs-chr'>'L'</span><span class='hs-conop'>:</span><span class='hs-chr'>'F'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\LF'</span>
<a name="line-468"></a> <span class='hs-chr'>'V'</span><span class='hs-conop'>:</span><span class='hs-chr'>'T'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\VT'</span>
<a name="line-469"></a> <span class='hs-chr'>'F'</span><span class='hs-conop'>:</span><span class='hs-chr'>'F'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\FF'</span>
<a name="line-470"></a> <span class='hs-chr'>'C'</span><span class='hs-conop'>:</span><span class='hs-chr'>'R'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\CR'</span>
<a name="line-471"></a> <span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-chr'>'O'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SO'</span>
<a name="line-472"></a> <span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-chr'>'I'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SI'</span>
<a name="line-473"></a> <span class='hs-chr'>'D'</span><span class='hs-conop'>:</span><span class='hs-chr'>'L'</span><span class='hs-conop'>:</span><span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DLE'</span>
<a name="line-474"></a> <span class='hs-chr'>'D'</span><span class='hs-conop'>:</span><span class='hs-chr'>'C'</span><span class='hs-conop'>:</span><span class='hs-chr'>'1'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DC1'</span>
<a name="line-475"></a> <span class='hs-chr'>'D'</span><span class='hs-conop'>:</span><span class='hs-chr'>'C'</span><span class='hs-conop'>:</span><span class='hs-chr'>'2'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DC2'</span>
<a name="line-476"></a> <span class='hs-chr'>'D'</span><span class='hs-conop'>:</span><span class='hs-chr'>'C'</span><span class='hs-conop'>:</span><span class='hs-chr'>'3'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DC3'</span>
<a name="line-477"></a> <span class='hs-chr'>'D'</span><span class='hs-conop'>:</span><span class='hs-chr'>'C'</span><span class='hs-conop'>:</span><span class='hs-chr'>'4'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DC4'</span>
<a name="line-478"></a> <span class='hs-chr'>'N'</span><span class='hs-conop'>:</span><span class='hs-chr'>'A'</span><span class='hs-conop'>:</span><span class='hs-chr'>'K'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\NAK'</span>
<a name="line-479"></a> <span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-chr'>'Y'</span><span class='hs-conop'>:</span><span class='hs-chr'>'N'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SYN'</span>
<a name="line-480"></a> <span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-chr'>'T'</span><span class='hs-conop'>:</span><span class='hs-chr'>'B'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ETB'</span>
<a name="line-481"></a> <span class='hs-chr'>'C'</span><span class='hs-conop'>:</span><span class='hs-chr'>'A'</span><span class='hs-conop'>:</span><span class='hs-chr'>'N'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\CAN'</span>
<a name="line-482"></a> <span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-chr'>'M'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\EM'</span>
<a name="line-483"></a> <span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-chr'>'U'</span><span class='hs-conop'>:</span><span class='hs-chr'>'B'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SUB'</span>
<a name="line-484"></a> <span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-chr'>'C'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ESC'</span>
<a name="line-485"></a> <span class='hs-chr'>'F'</span><span class='hs-conop'>:</span><span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\FS'</span>
<a name="line-486"></a> <span class='hs-chr'>'G'</span><span class='hs-conop'>:</span><span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\GS'</span>
<a name="line-487"></a> <span class='hs-chr'>'R'</span><span class='hs-conop'>:</span><span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\RS'</span>
<a name="line-488"></a> <span class='hs-chr'>'U'</span><span class='hs-conop'>:</span><span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\US'</span>
<a name="line-489"></a> <span class='hs-chr'>'S'</span><span class='hs-conop'>:</span><span class='hs-chr'>'P'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>2</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SP'</span>
<a name="line-490"></a> <span class='hs-chr'>'D'</span><span class='hs-conop'>:</span><span class='hs-chr'>'E'</span><span class='hs-conop'>:</span><span class='hs-chr'>'L'</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>discard</span> <span class='hs-num'>3</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DEL'</span>
<a name="line-491"></a>
<a name="line-492"></a><span class='hs-comment'>-- Escaped numbers</span>
<a name="line-493"></a>
<a name="line-494"></a> <span class='hs-chr'>'o'</span><span class='hs-conop'>:</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isOctDigit</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-495"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-496"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexOctal</span>
<a name="line-497"></a> <span class='hs-varid'>checkChar</span> <span class='hs-varid'>n</span>
<a name="line-498"></a> <span class='hs-chr'>'x'</span><span class='hs-conop'>:</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isHexDigit</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-499"></a> <span class='hs-varid'>discard</span> <span class='hs-num'>1</span>
<a name="line-500"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexHexadecimal</span>
<a name="line-501"></a> <span class='hs-varid'>checkChar</span> <span class='hs-varid'>n</span>
<a name="line-502"></a> <span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span>
<a name="line-503"></a> <span class='hs-varid'>n</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexDecimal</span>
<a name="line-504"></a> <span class='hs-varid'>checkChar</span> <span class='hs-varid'>n</span>
<a name="line-505"></a>
<a name="line-506"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Illegal escape sequence"</span>
<a name="line-507"></a>
<a name="line-508"></a> <span class='hs-keyword'>where</span>
<a name="line-509"></a> <span class='hs-varid'>checkChar</span> <span class='hs-varid'>n</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>n</span> <span class='hs-varop'><=</span> <span class='hs-num'>0x10FFFF</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>chr</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromInteger</span> <span class='hs-varid'>n</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-510"></a> <span class='hs-varid'>checkChar</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Character constant out of range"</span>
<a name="line-511"></a>
<a name="line-512"></a><span class='hs-comment'>-- Production cntrl from section B.2</span>
<a name="line-513"></a>
<a name="line-514"></a> <span class='hs-varid'>cntrl</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Char</span>
<a name="line-515"></a> <span class='hs-varid'>cntrl</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>c</span> <span class='hs-varop'>>=</span> <span class='hs-chr'>'@'</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>c</span> <span class='hs-varop'><=</span> <span class='hs-chr'>'_'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>chr</span> <span class='hs-layout'>(</span><span class='hs-varid'>ord</span> <span class='hs-varid'>c</span> <span class='hs-comment'>-</span> <span class='hs-varid'>ord</span> <span class='hs-chr'>'@'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-516"></a> <span class='hs-varid'>cntrl</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"Illegal control character"</span>
<a name="line-517"></a>
<a name="line-518"></a><a name="lexOctal"></a><span class='hs-comment'>-- assumes at least one octal digit</span>
<a name="line-519"></a><span class='hs-definition'>lexOctal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Integer</span>
<a name="line-520"></a><span class='hs-definition'>lexOctal</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-521"></a> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isOctDigit</span>
<a name="line-522"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseInteger</span> <span class='hs-num'>8</span> <span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
<a name="line-523"></a>
<a name="line-524"></a><a name="lexHexadecimal"></a><span class='hs-comment'>-- assumes at least one hexadecimal digit</span>
<a name="line-525"></a><span class='hs-definition'>lexHexadecimal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Integer</span>
<a name="line-526"></a><span class='hs-definition'>lexHexadecimal</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-527"></a> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isHexDigit</span>
<a name="line-528"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseInteger</span> <span class='hs-num'>16</span> <span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
<a name="line-529"></a>
<a name="line-530"></a><a name="lexDecimal"></a><span class='hs-comment'>-- assumes at least one decimal digit</span>
<a name="line-531"></a><span class='hs-definition'>lexDecimal</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Lex</span> <span class='hs-varid'>a</span> <span class='hs-conid'>Integer</span>
<a name="line-532"></a><span class='hs-definition'>lexDecimal</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-533"></a> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>lexWhile</span> <span class='hs-varid'>isDigit</span>
<a name="line-534"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseInteger</span> <span class='hs-num'>10</span> <span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
<a name="line-535"></a>
<a name="line-536"></a><a name="parseInteger"></a><span class='hs-comment'>-- Stolen from Hugs's Prelude</span>
<a name="line-537"></a><span class='hs-definition'>parseInteger</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Integer</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Integer</span>
<a name="line-538"></a><span class='hs-definition'>parseInteger</span> <span class='hs-varid'>radix</span> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'>=</span>
<a name="line-539"></a> <span class='hs-varid'>foldl1</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>n</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>n</span> <span class='hs-varop'>*</span> <span class='hs-varid'>radix</span> <span class='hs-varop'>+</span> <span class='hs-varid'>d</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>toInteger</span> <span class='hs-varop'>.</span> <span class='hs-varid'>digitToInt</span><span class='hs-layout'>)</span> <span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
</pre></body>
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