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<pre><a name="line-1"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Parse</span>
<a name="line-2"></a> <span class='hs-layout'>(</span> <span class='hs-comment'>-- * The Parse class is a replacement for the standard Read class. </span>
<a name="line-3"></a> <span class='hs-comment'>-- $parser</span>
<a name="line-4"></a> <span class='hs-conid'>TextParser</span> <span class='hs-comment'>-- synonym for Parser Char, i.e. string input, no state</span>
<a name="line-5"></a> <span class='hs-layout'>,</span> <span class='hs-conid'>Parse</span><span class='hs-layout'>(</span><span class='hs-keyglyph'>..</span><span class='hs-layout'>)</span> <span class='hs-comment'>-- instances: (), (a,b), (a,b,c), Maybe a, Either a, [a],</span>
<a name="line-6"></a> <span class='hs-comment'>-- Int, Integer, Float, Double, Char, Bool</span>
<a name="line-7"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseByRead</span> <span class='hs-comment'>-- :: Read a => String -> TextParser a</span>
<a name="line-8"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>readByParse</span> <span class='hs-comment'>-- :: TextParser a -> ReadS a</span>
<a name="line-9"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>readsPrecByParsePrec</span> <span class='hs-comment'>-- :: (Int->TextParser a) -> Int -> ReadS a</span>
<a name="line-10"></a> <span class='hs-comment'>-- ** Combinators specific to string input, lexed haskell-style</span>
<a name="line-11"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>word</span> <span class='hs-comment'>-- :: TextParser String</span>
<a name="line-12"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>isWord</span> <span class='hs-comment'>-- :: String -> TextParser ()</span>
<a name="line-13"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>optionalParens</span> <span class='hs-comment'>-- :: TextParser a -> TextParser a</span>
<a name="line-14"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parens</span> <span class='hs-comment'>-- :: Bool -> TextParser a -> TextParser a</span>
<a name="line-15"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>field</span> <span class='hs-comment'>-- :: Parse a => String -> TextParser a</span>
<a name="line-16"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>constructors</span><span class='hs-comment'>-- :: [(String,TextParser a)] -> TextParser a</span>
<a name="line-17"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>enumeration</span> <span class='hs-comment'>-- :: Show a => String -> [a] -> TextParser a</span>
<a name="line-18"></a> <span class='hs-comment'>-- ** Parsers for literal numerics and characters</span>
<a name="line-19"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseSigned</span>
<a name="line-20"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseInt</span>
<a name="line-21"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseDec</span>
<a name="line-22"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseOct</span>
<a name="line-23"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseHex</span>
<a name="line-24"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseFloat</span>
<a name="line-25"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>parseLitChar</span>
<a name="line-26"></a> <span class='hs-comment'>-- ** Re-export all the more general combinators from Poly too</span>
<a name="line-27"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>ParserCombinators</span><span class='hs-varop'>.</span><span class='hs-conid'>Poly</span>
<a name="line-28"></a> <span class='hs-comment'>-- ** Strings as whole entities</span>
<a name="line-29"></a> <span class='hs-layout'>,</span> <span class='hs-varid'>allAsString</span>
<a name="line-30"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-31"></a>
<a name="line-32"></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-keyword'>as</span> <span class='hs-conid'>Char</span> <span class='hs-layout'>(</span><span class='hs-varid'>isSpace</span><span class='hs-layout'>,</span><span class='hs-varid'>toLower</span><span class='hs-layout'>,</span><span class='hs-varid'>isUpper</span><span class='hs-layout'>,</span><span class='hs-varid'>isDigit</span><span class='hs-layout'>,</span><span class='hs-varid'>isOctDigit</span>
<a name="line-33"></a> <span class='hs-layout'>,</span><span class='hs-varid'>isHexDigit</span><span class='hs-layout'>,</span><span class='hs-varid'>digitToInt</span><span class='hs-layout'>,</span><span class='hs-varid'>isAlpha</span><span class='hs-layout'>,</span><span class='hs-varid'>isAlphaNum</span><span class='hs-layout'>,</span><span class='hs-varid'>ord</span><span class='hs-layout'>,</span><span class='hs-varid'>chr</span><span class='hs-layout'>)</span>
<a name="line-34"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>List</span> <span class='hs-layout'>(</span><span class='hs-varid'>intersperse</span><span class='hs-layout'>)</span>
<a name="line-35"></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-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>ParserCombinators</span><span class='hs-varop'>.</span><span class='hs-conid'>Poly</span>
<a name="line-37"></a>
<a name="line-38"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-39"></a><span class='hs-comment'>-- $parser</span>
<a name="line-40"></a><span class='hs-comment'>-- The Parse class is a replacement for the standard Read class. It is a</span>
<a name="line-41"></a><span class='hs-comment'>-- specialisation of the (poly) Parser monad for String input.</span>
<a name="line-42"></a><span class='hs-comment'>-- There are instances defined for all Prelude types.</span>
<a name="line-43"></a><span class='hs-comment'>-- For user-defined types, you can write your own instance, or use</span>
<a name="line-44"></a><span class='hs-comment'>-- DrIFT to generate them automatically, e.g. {-! derive : Parse !-}</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="TextParser"></a><span class='hs-comment'>-- | A synonym for Parser Char, i.e. string input (no state)</span>
<a name="line-47"></a><a name="TextParser"></a><span class='hs-keyword'>type</span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Parser</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>a</span>
<a name="line-48"></a>
<a name="line-49"></a><a name="Parse"></a><span class='hs-comment'>-- | The class @Parse@ is a replacement for @Read@, operating over String input.</span>
<a name="line-50"></a><a name="Parse"></a><span class='hs-comment'>-- Essentially, it permits better error messages for why something failed to</span>
<a name="line-51"></a><a name="Parse"></a><span class='hs-comment'>-- parse. It is rather important that @parse@ can read back exactly what</span>
<a name="line-52"></a><a name="Parse"></a><span class='hs-comment'>-- is generated by the corresponding instance of @show@. To apply a parser</span>
<a name="line-53"></a><a name="Parse"></a><span class='hs-comment'>-- to some text, use @runParser@.</span>
<a name="line-54"></a><a name="Parse"></a><span class='hs-keyword'>class</span> <span class='hs-conid'>Parse</span> <span class='hs-varid'>a</span> <span class='hs-keyword'>where</span>
<a name="line-55"></a> <span class='hs-comment'>-- | A straightforward parser for an item. (A minimal definition of</span>
<a name="line-56"></a> <span class='hs-comment'>-- a class instance requires either |parse| or |parsePrec|.)</span>
<a name="line-57"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-58"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parsePrec</span> <span class='hs-num'>0</span>
<a name="line-59"></a> <span class='hs-comment'>-- | A straightforward parser for an item, given the precedence of</span>
<a name="line-60"></a> <span class='hs-comment'>-- any surrounding expression. (Precedence determines whether</span>
<a name="line-61"></a> <span class='hs-comment'>-- parentheses are mandatory or optional.)</span>
<a name="line-62"></a> <span class='hs-varid'>parsePrec</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-63"></a> <span class='hs-varid'>parsePrec</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>optionalParens</span> <span class='hs-varid'>parse</span>
<a name="line-64"></a> <span class='hs-comment'>-- | Parsing a list of items by default accepts the [] and comma syntax,</span>
<a name="line-65"></a> <span class='hs-comment'>-- except when the list is really a character string using \"\".</span>
<a name="line-66"></a> <span class='hs-varid'>parseList</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextParser</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- only to distinguish [] and ""</span>
<a name="line-67"></a> <span class='hs-varid'>parseList</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>"[]"</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>}</span>
<a name="line-68"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-69"></a> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>"["</span><span class='hs-layout'>;</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>"]"</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>}</span>
<a name="line-70"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-71"></a> <span class='hs-varid'>bracketSep</span> <span class='hs-layout'>(</span><span class='hs-varid'>isWord</span> <span class='hs-str'>"["</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>isWord</span> <span class='hs-str'>","</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>isWord</span> <span class='hs-str'>"]"</span><span class='hs-layout'>)</span>
<a name="line-72"></a> <span class='hs-layout'>(</span><span class='hs-varid'>optionalParens</span> <span class='hs-varid'>parse</span><span class='hs-layout'>)</span>
<a name="line-73"></a> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"Expected a list, but\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-74"></a>
<a name="line-75"></a><a name="parseByRead"></a><span class='hs-comment'>-- | If there already exists a Read instance for a type, then we can make</span>
<a name="line-76"></a><span class='hs-comment'>-- a Parser for it, but with only poor error-reporting. The string argument</span>
<a name="line-77"></a><span class='hs-comment'>-- is the expected type or value (for error-reporting only).</span>
<a name="line-78"></a><span class='hs-definition'>parseByRead</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Read</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-79"></a><span class='hs-definition'>parseByRead</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span>
<a name="line-80"></a> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span><span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>reads</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-81"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failure</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-str'>"no parse, expected a "</span><span class='hs-varop'>++</span><span class='hs-varid'>name</span><span class='hs-layout'>)</span>
<a name="line-82"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>s'</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Success</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>a</span>
<a name="line-83"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failure</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-str'>"ambiguous parse, expected a "</span><span class='hs-varop'>++</span><span class='hs-varid'>name</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-layout'>)</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="readByParse"></a><span class='hs-comment'>-- | If you have a TextParser for a type, you can easily make it into</span>
<a name="line-87"></a><span class='hs-comment'>-- a Read instance, by throwing away any error messages.</span>
<a name="line-88"></a><span class='hs-definition'>readByParse</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadS</span> <span class='hs-varid'>a</span>
<a name="line-89"></a><span class='hs-definition'>readByParse</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>inp</span><span class='hs-keyglyph'>-></span>
<a name="line-90"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>runParser</span> <span class='hs-varid'>p</span> <span class='hs-varid'>inp</span> <span class='hs-keyword'>of</span>
<a name="line-91"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>err</span><span class='hs-layout'>,</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-92"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varid'>val</span><span class='hs-layout'>,</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>val</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-93"></a>
<a name="line-94"></a><a name="readsPrecByParsePrec"></a><span class='hs-comment'>-- | If you have a TextParser for a type, you can easily make it into</span>
<a name="line-95"></a><span class='hs-comment'>-- a Read instance, by throwing away any error messages.</span>
<a name="line-96"></a><span class='hs-definition'>readsPrecByParsePrec</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>ReadS</span> <span class='hs-varid'>a</span>
<a name="line-97"></a><span class='hs-definition'>readsPrecByParsePrec</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>\</span><span class='hs-varid'>prec</span> <span class='hs-varid'>inp</span><span class='hs-keyglyph'>-></span>
<a name="line-98"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>runParser</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span> <span class='hs-varid'>prec</span><span class='hs-layout'>)</span> <span class='hs-varid'>inp</span> <span class='hs-keyword'>of</span>
<a name="line-99"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Left</span> <span class='hs-varid'>err</span><span class='hs-layout'>,</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>[]</span>
<a name="line-100"></a> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varid'>val</span><span class='hs-layout'>,</span> <span class='hs-varid'>rest</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-varid'>val</span><span class='hs-layout'>,</span><span class='hs-varid'>rest</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-101"></a>
<a name="line-102"></a><a name="word"></a><span class='hs-comment'>-- | One lexical chunk. This is Haskell'98-style lexing - the result</span>
<a name="line-103"></a><span class='hs-comment'>-- should match Prelude.lex apart from better error-reporting.</span>
<a name="line-104"></a><span class='hs-definition'>word</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextParser</span> <span class='hs-conid'>String</span>
<a name="line-105"></a><span class='hs-definition'>word</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varid'>p</span>
<a name="line-106"></a> <span class='hs-keyword'>where</span>
<a name="line-107"></a> <span class='hs-varid'>p</span> <span class='hs-str'>""</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Failure</span> <span class='hs-str'>""</span> <span class='hs-str'>"end of input"</span>
<a name="line-108"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</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-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>dropWhile</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-109"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\''</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-conid'>P</span> <span class='hs-varid'>lit</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseLitChar</span> <span class='hs-keyword'>in</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>lit</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\''</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-110"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-chr'>'"'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lexString</span> <span class='hs-str'>"\""</span> <span class='hs-varid'>s</span>
<a name="line-111"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>lexString</span> <span class='hs-varid'>acc</span> <span class='hs-layout'>(</span><span class='hs-chr'>'"'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-varid'>reverse</span> <span class='hs-layout'>(</span><span class='hs-chr'>'"'</span><span class='hs-conop'>:</span><span class='hs-varid'>acc</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-112"></a> <span class='hs-varid'>lexString</span> <span class='hs-varid'>acc</span> <span class='hs-layout'>(</span><span class='hs-chr'>'\\'</span><span class='hs-conop'>:</span><span class='hs-chr'>'"'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lexString</span> <span class='hs-layout'>(</span><span class='hs-str'>"\"\\"</span><span class='hs-varop'>++</span><span class='hs-varid'>acc</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-113"></a> <span class='hs-varid'>lexString</span> <span class='hs-varid'>acc</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> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lexString</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>acc</span><span class='hs-layout'>)</span> <span class='hs-varid'>s</span>
<a name="line-114"></a> <span class='hs-varid'>lexString</span> <span class='hs-varid'>acc</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Failure</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>(</span><span class='hs-str'>"end of input in "</span>
<a name="line-115"></a> <span class='hs-varop'>++</span><span class='hs-str'>"string literal "</span>
<a name="line-116"></a> <span class='hs-varop'>++</span><span class='hs-varid'>acc</span><span class='hs-layout'>)</span>
<a name="line-117"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'x'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'x'</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isHexDigit</span> <span class='hs-varid'>s</span>
<a name="line-118"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'X'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'X'</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isHexDigit</span> <span class='hs-varid'>s</span>
<a name="line-119"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'o'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'o'</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isOctDigit</span> <span class='hs-varid'>s</span>
<a name="line-120"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'O'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-chr'>'0'</span><span class='hs-conop'>:</span><span class='hs-chr'>'O'</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isOctDigit</span> <span class='hs-varid'>s</span>
<a name="line-121"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSingle</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span>
<a name="line-122"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isSym</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>sym</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isSym</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>in</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>sym</span><span class='hs-layout'>)</span>
<a name="line-123"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isIdInit</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>nam</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isIdChar</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>in</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>nam</span><span class='hs-layout'>)</span>
<a name="line-124"></a> <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'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>in</span>
<a name="line-125"></a> <span class='hs-varid'>lexFracExp</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span>
<a name="line-126"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Failure</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> <span class='hs-layout'>(</span><span class='hs-str'>"Bad character: "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-127"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>isSingle</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>
<a name="line-128"></a> <span class='hs-varid'>isSym</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>
<a name="line-129"></a> <span class='hs-varid'>isIdInit</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'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'_'</span>
<a name="line-130"></a> <span class='hs-varid'>isIdChar</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>isAlphaNum</span> <span class='hs-varid'>c</span> <span class='hs-varop'>||</span> <span class='hs-varid'>c</span> <span class='hs-varop'>`elem`</span> <span class='hs-str'>"_'"</span>
<a name="line-131"></a> <span class='hs-varid'>lexFracExp</span> <span class='hs-varid'>acc</span> <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-varid'>s</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>
<a name="line-132"></a> <span class='hs-varid'>lexExp</span> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span><span class='hs-varop'>++</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-varid'>ds</span><span class='hs-layout'>)</span> <span class='hs-varid'>t</span>
<a name="line-133"></a> <span class='hs-keyword'>where</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>t</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>span</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>s</span>
<a name="line-134"></a> <span class='hs-varid'>lexFracExp</span> <span class='hs-varid'>acc</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lexExp</span> <span class='hs-varid'>acc</span> <span class='hs-varid'>s</span>
<a name="line-135"></a> <span class='hs-varid'>lexExp</span> <span class='hs-varid'>acc</span> <span class='hs-layout'>(</span><span class='hs-varid'>e</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>e</span><span class='hs-varop'>`elem`</span><span class='hs-str'>"eE"</span> <span class='hs-keyglyph'>=</span>
<a name="line-136"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-137"></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-varid'>t</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>
<a name="line-138"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>span</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>in</span>
<a name="line-139"></a> <span class='hs-conid'>Success</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span><span class='hs-varop'>++</span><span class='hs-str'>"e+"</span><span class='hs-varop'>++</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
<a name="line-140"></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-varid'>t</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>
<a name="line-141"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>span</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>in</span>
<a name="line-142"></a> <span class='hs-conid'>Success</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span><span class='hs-varop'>++</span><span class='hs-str'>"e-"</span><span class='hs-varop'>++</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-layout'>(</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-varid'>t</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>
<a name="line-144"></a> <span class='hs-keyword'>let</span> <span class='hs-layout'>(</span><span class='hs-varid'>ds</span><span class='hs-layout'>,</span><span class='hs-varid'>u</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>=</span><span class='hs-varid'>span</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>t</span> <span class='hs-keyword'>in</span>
<a name="line-145"></a> <span class='hs-conid'>Success</span> <span class='hs-varid'>u</span> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span><span class='hs-varop'>++</span><span class='hs-str'>"e"</span><span class='hs-varop'>++</span><span class='hs-varid'>d</span><span class='hs-conop'>:</span><span class='hs-varid'>ds</span><span class='hs-layout'>)</span>
<a name="line-146"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failure</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-str'>"missing +/-/digit "</span>
<a name="line-147"></a> <span class='hs-varop'>++</span><span class='hs-str'>"after e in float "</span>
<a name="line-148"></a> <span class='hs-varop'>++</span><span class='hs-str'>"literal: "</span>
<a name="line-149"></a> <span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>acc</span><span class='hs-varop'>++</span><span class='hs-str'>"e"</span><span class='hs-varop'>++</span><span class='hs-str'>"..."</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-150"></a> <span class='hs-varid'>lexExp</span> <span class='hs-varid'>acc</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Success</span> <span class='hs-varid'>s</span> <span class='hs-varid'>acc</span>
<a name="line-151"></a>
<a name="line-152"></a>
<a name="line-153"></a>
<a name="line-154"></a><a name="oldword"></a><span class='hs-comment'>-- | One lexical chunk (Haskell'98-style lexing - the result should match</span>
<a name="line-155"></a><span class='hs-comment'>-- Prelude.lex apart from error-reporting).</span>
<a name="line-156"></a><span class='hs-definition'>oldword</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextParser</span> <span class='hs-conid'>String</span>
<a name="line-157"></a><span class='hs-definition'>oldword</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span><span class='hs-keyglyph'>-></span> <span class='hs-keyword'>case</span> <span class='hs-varid'>lex</span> <span class='hs-varid'>s</span> <span class='hs-keyword'>of</span>
<a name="line-158"></a> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failure</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-str'>"no input? (impossible)"</span><span class='hs-layout'>)</span>
<a name="line-159"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-str'>""</span><span class='hs-layout'>,</span><span class='hs-str'>""</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failure</span> <span class='hs-str'>""</span> <span class='hs-layout'>(</span><span class='hs-str'>"no input?"</span><span class='hs-layout'>)</span>
<a name="line-160"></a> <span class='hs-keyglyph'>[</span><span class='hs-layout'>(</span><span class='hs-str'>""</span><span class='hs-layout'>,</span><span class='hs-varid'>s'</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failure</span> <span class='hs-varid'>s</span> <span class='hs-layout'>(</span><span class='hs-str'>"lexing failed?"</span><span class='hs-layout'>)</span>
<a name="line-161"></a> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>s'</span><span class='hs-layout'>)</span><span class='hs-conop'>:</span><span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Success</span> <span class='hs-varid'>s'</span> <span class='hs-varid'>x</span>
<a name="line-162"></a> <span class='hs-layout'>)</span>
<a name="line-163"></a>
<a name="line-164"></a><a name="isWord"></a><span class='hs-comment'>-- | Ensure that the next input word is the given string. (Note the input</span>
<a name="line-165"></a><span class='hs-comment'>-- is lexed as haskell, so wordbreaks at spaces, symbols, etc.)</span>
<a name="line-166"></a><span class='hs-definition'>isWord</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-conid'>String</span>
<a name="line-167"></a><span class='hs-definition'>isWord</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>w'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>word</span>
<a name="line-168"></a> <span class='hs-layout'>;</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>w'</span><span class='hs-varop'>==</span><span class='hs-varid'>w</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-varid'>w</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"expected "</span><span class='hs-varop'>++</span><span class='hs-varid'>w</span><span class='hs-varop'>++</span><span class='hs-str'>" got "</span><span class='hs-varop'>++</span><span class='hs-varid'>w'</span><span class='hs-layout'>)</span>
<a name="line-169"></a> <span class='hs-layout'>}</span>
<a name="line-170"></a>
<a name="line-171"></a><a name="optionalParens"></a><span class='hs-comment'>-- | Allow nested parens around an item.</span>
<a name="line-172"></a><span class='hs-definition'>optionalParens</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-173"></a><span class='hs-definition'>optionalParens</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parens</span> <span class='hs-conid'>False</span> <span class='hs-varid'>p</span>
<a name="line-174"></a>
<a name="line-175"></a><a name="parens"></a><span class='hs-comment'>-- | Allow nested parens around an item (one set required when Bool is True).</span>
<a name="line-176"></a><span class='hs-definition'>parens</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Bool</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-177"></a><span class='hs-definition'>parens</span> <span class='hs-conid'>True</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>bracket</span> <span class='hs-layout'>(</span><span class='hs-varid'>isWord</span> <span class='hs-str'>"("</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>isWord</span> <span class='hs-str'>")"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>parens</span> <span class='hs-conid'>False</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-178"></a><span class='hs-definition'>parens</span> <span class='hs-conid'>False</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parens</span> <span class='hs-conid'>True</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`onFail`</span> <span class='hs-varid'>p</span>
<a name="line-179"></a>
<a name="line-180"></a><a name="field"></a><span class='hs-comment'>-- | Deal with named field syntax. The string argument is the field name,</span>
<a name="line-181"></a><span class='hs-comment'>-- and the parser returns the value of the field.</span>
<a name="line-182"></a><span class='hs-definition'>field</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Parse</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-183"></a><span class='hs-definition'>field</span> <span class='hs-varid'>name</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-varid'>name</span><span class='hs-layout'>;</span> <span class='hs-varid'>commit</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>"="</span><span class='hs-layout'>;</span> <span class='hs-varid'>parse</span> <span class='hs-layout'>}</span> <span class='hs-layout'>}</span>
<a name="line-184"></a>
<a name="line-185"></a><a name="constructors"></a><span class='hs-comment'>-- | Parse one of a bunch of alternative constructors. In the list argument,</span>
<a name="line-186"></a><span class='hs-comment'>-- the first element of the pair is the constructor name, and</span>
<a name="line-187"></a><span class='hs-comment'>-- the second is the parser for the rest of the value. The first matching</span>
<a name="line-188"></a><span class='hs-comment'>-- parse is returned.</span>
<a name="line-189"></a><span class='hs-definition'>constructors</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'>TextParser</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-190"></a><span class='hs-definition'>constructors</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>oneOf'</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>cons</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-191"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>cons</span> <span class='hs-layout'>(</span><span class='hs-varid'>name</span><span class='hs-layout'>,</span><span class='hs-varid'>p</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span>
<a name="line-192"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>name</span>
<a name="line-193"></a> <span class='hs-layout'>,</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-varid'>name</span>
<a name="line-194"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`adjustErrBad`</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-str'>"got constructor, but within "</span>
<a name="line-195"></a> <span class='hs-varop'>++</span><span class='hs-varid'>name</span><span class='hs-varop'>++</span><span class='hs-str'>",\n"</span><span class='hs-layout'>)</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-196"></a> <span class='hs-layout'>}</span>
<a name="line-197"></a> <span class='hs-layout'>)</span>
<a name="line-198"></a>
<a name="line-199"></a><a name="enumeration"></a><span class='hs-comment'>-- | Parse one of the given nullary constructors (an enumeration).</span>
<a name="line-200"></a><span class='hs-comment'>-- The string argument is the name of the type, and the list argument</span>
<a name="line-201"></a><span class='hs-comment'>-- should contain all of the possible enumeration values.</span>
<a name="line-202"></a><span class='hs-definition'>enumeration</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Show</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-203"></a><span class='hs-definition'>enumeration</span> <span class='hs-varid'>typ</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>oneOf</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>-></span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-layout'>(</span><span class='hs-varid'>show</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-varid'>c</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-204"></a> <span class='hs-varop'>`adjustErr`</span>
<a name="line-205"></a> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>(</span><span class='hs-str'>"\n expected "</span><span class='hs-varop'>++</span><span class='hs-varid'>typ</span><span class='hs-varop'>++</span><span class='hs-str'>" value ("</span><span class='hs-varop'>++</span><span class='hs-varid'>e</span><span class='hs-varop'>++</span><span class='hs-str'>")"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-206"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>e</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>concat</span> <span class='hs-layout'>(</span><span class='hs-varid'>intersperse</span> <span class='hs-str'>", "</span> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>init</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-207"></a> <span class='hs-varop'>++</span> <span class='hs-str'>", or "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-layout'>(</span><span class='hs-varid'>last</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span>
<a name="line-208"></a>
<a name="line-209"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
<a name="line-210"></a><span class='hs-comment'>-- Instances for all the Standard Prelude types.</span>
<a name="line-211"></a>
<a name="line-212"></a><a name="parseSigned"></a><span class='hs-comment'>-- Numeric types</span>
<a name="line-213"></a><span class='hs-definition'>parseSigned</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Real</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-214"></a><span class='hs-definition'>parseSigned</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'-'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>commit</span> <span class='hs-layout'>(</span><span class='hs-varid'>fmap</span> <span class='hs-varid'>negate</span> <span class='hs-varid'>p</span><span class='hs-layout'>)</span>
<a name="line-215"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-216"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>p</span>
<a name="line-217"></a>
<a name="line-218"></a><a name="parseInt"></a><span class='hs-definition'>parseInt</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span>
<a name="line-219"></a> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Bool</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-layout'>(</span><span class='hs-conid'>Char</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span>
<a name="line-220"></a> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-221"></a><span class='hs-definition'>parseInt</span> <span class='hs-varid'>base</span> <span class='hs-varid'>radix</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>digitToInt</span> <span class='hs-keyglyph'>=</span>
<a name="line-222"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>cs</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many1</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isDigit</span><span class='hs-layout'>)</span>
<a name="line-223"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><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>
<a name="line-224"></a> <span class='hs-layout'>(</span><span class='hs-varid'>map</span> <span class='hs-layout'>(</span><span class='hs-varid'>fromIntegral</span><span class='hs-varop'>.</span><span class='hs-varid'>digitToInt</span><span class='hs-layout'>)</span> <span class='hs-varid'>cs</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-225"></a> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-layout'>(</span><span class='hs-str'>"\nexpected one or more "</span><span class='hs-varop'>++</span><span class='hs-varid'>base</span><span class='hs-varop'>++</span><span class='hs-str'>" digits"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-226"></a><a name="parseDec"></a><span class='hs-definition'>parseDec</span><span class='hs-layout'>,</span> <span class='hs-varid'>parseOct</span><span class='hs-layout'>,</span> <span class='hs-varid'>parseHex</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>Integral</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-227"></a><span class='hs-definition'>parseDec</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseInt</span> <span class='hs-str'>"decimal"</span> <span class='hs-num'>10</span> <span class='hs-conid'>Char</span><span class='hs-varop'>.</span><span class='hs-varid'>isDigit</span> <span class='hs-conid'>Char</span><span class='hs-varop'>.</span><span class='hs-varid'>digitToInt</span>
<a name="line-228"></a><a name="parseOct"></a><span class='hs-definition'>parseOct</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseInt</span> <span class='hs-str'>"octal"</span> <span class='hs-num'>8</span> <span class='hs-conid'>Char</span><span class='hs-varop'>.</span><span class='hs-varid'>isOctDigit</span> <span class='hs-conid'>Char</span><span class='hs-varop'>.</span><span class='hs-varid'>digitToInt</span>
<a name="line-229"></a><a name="parseHex"></a><span class='hs-definition'>parseHex</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseInt</span> <span class='hs-str'>"hex"</span> <span class='hs-num'>16</span> <span class='hs-conid'>Char</span><span class='hs-varop'>.</span><span class='hs-varid'>isHexDigit</span> <span class='hs-conid'>Char</span><span class='hs-varop'>.</span><span class='hs-varid'>digitToInt</span>
<a name="line-230"></a>
<a name="line-231"></a><a name="parseFloat"></a><span class='hs-definition'>parseFloat</span> <span class='hs-keyglyph'>::</span> <span class='hs-layout'>(</span><span class='hs-conid'>RealFrac</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>TextParser</span> <span class='hs-varid'>a</span>
<a name="line-232"></a><span class='hs-definition'>parseFloat</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>ds</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many1</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isDigit</span><span class='hs-layout'>)</span>
<a name="line-233"></a> <span class='hs-varid'>frac</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-chr'>'.'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span>
<a name="line-234"></a> <span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isDigit</span><span class='hs-layout'>)</span>
<a name="line-235"></a> <span class='hs-varop'>`adjustErrBad`</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-str'>"expected digit after ."</span><span class='hs-layout'>)</span>
<a name="line-236"></a> <span class='hs-varop'>`onFail`</span> <span class='hs-varid'>return</span> <span class='hs-conid'>[]</span> <span class='hs-layout'>)</span>
<a name="line-237"></a> <span class='hs-varid'>exp</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>exponent</span> <span class='hs-varop'>`onFail`</span> <span class='hs-varid'>return</span> <span class='hs-num'>0</span>
<a name="line-238"></a> <span class='hs-layout'>(</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fromRational</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>*</span> <span class='hs-layout'>(</span><span class='hs-num'>10</span><span class='hs-varop'>^^</span><span class='hs-layout'>(</span><span class='hs-varid'>exp</span> <span class='hs-comment'>-</span> <span class='hs-varid'>length</span> <span class='hs-varid'>frac</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-239"></a> <span class='hs-varop'>.</span> <span class='hs-layout'>(</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-layout'>(</span><span class='hs-keyglyph'>\</span> <span class='hs-layout'>(</span><span class='hs-conid'>Right</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>-></span><span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-varop'>.</span> <span class='hs-varid'>fst</span>
<a name="line-240"></a> <span class='hs-varop'>.</span> <span class='hs-varid'>runParser</span> <span class='hs-varid'>parseDec</span> <span class='hs-layout'>)</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-241"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-242"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span><span class='hs-varop'>.</span><span class='hs-varid'>isSpace</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-243"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>map</span> <span class='hs-varid'>toLower</span> <span class='hs-varid'>w</span> <span class='hs-keyword'>of</span>
<a name="line-244"></a> <span class='hs-str'>"nan"</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-varop'>/</span><span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-245"></a> <span class='hs-str'>"infinity"</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-num'>1</span><span class='hs-varop'>/</span><span class='hs-num'>0</span><span class='hs-layout'>)</span>
<a name="line-246"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"expected a floating point number"</span>
<a name="line-247"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>exponent</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'e'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>toLower</span> <span class='hs-varid'>next</span>
<a name="line-248"></a> <span class='hs-varid'>commit</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-chr'>'+'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>parseDec</span>
<a name="line-249"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-250"></a> <span class='hs-varid'>parseSigned</span> <span class='hs-varid'>parseDec</span> <span class='hs-layout'>)</span>
<a name="line-251"></a>
<a name="line-252"></a><a name="parseLitChar"></a><span class='hs-definition'>parseLitChar</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextParser</span> <span class='hs-conid'>Char</span>
<a name="line-253"></a><span class='hs-definition'>parseLitChar</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'\''</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-str'>"expected a literal char"</span><span class='hs-layout'>)</span>
<a name="line-254"></a> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span>
<a name="line-255"></a> <span class='hs-varid'>char</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-256"></a> <span class='hs-chr'>'\\'</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>next</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>escape</span>
<a name="line-257"></a> <span class='hs-chr'>'\''</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>fail</span> <span class='hs-str'>"expected a literal char, got ''"</span>
<a name="line-258"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>return</span> <span class='hs-varid'>c</span>
<a name="line-259"></a> <span class='hs-chr'>'\''</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span> <span class='hs-varop'>`adjustErrBad`</span> <span class='hs-layout'>(</span><span class='hs-varop'>++</span><span class='hs-str'>"literal char has no final '"</span><span class='hs-layout'>)</span>
<a name="line-260"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>char</span>
<a name="line-261"></a> <span class='hs-keyword'>where</span>
<a name="line-262"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'a'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\a'</span>
<a name="line-263"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'b'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\b'</span>
<a name="line-264"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'f'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\f'</span>
<a name="line-265"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'n'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\n'</span>
<a name="line-266"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'r'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\r'</span>
<a name="line-267"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'t'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\t'</span>
<a name="line-268"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'v'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\v'</span>
<a name="line-269"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'\\'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\\'</span>
<a name="line-270"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'"'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'"'</span>
<a name="line-271"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'\''</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\''</span>
<a name="line-272"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'^'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>ctrl</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span>
<a name="line-273"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>ctrl</span> <span class='hs-varop'>>=</span> <span class='hs-chr'>'@'</span> <span class='hs-varop'>&&</span> <span class='hs-varid'>ctrl</span> <span class='hs-varop'><=</span> <span class='hs-chr'>'_'</span>
<a name="line-274"></a> <span class='hs-keyword'>then</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'>ctrl</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-275"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"literal char ctrl-escape malformed: \\^"</span>
<a name="line-276"></a> <span class='hs-varop'>++</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>ctrl</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-277"></a> <span class='hs-varid'>escape</span> <span class='hs-varid'>d</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isDigit</span> <span class='hs-varid'>d</span>
<a name="line-278"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>chr</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varid'>reparse</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>d</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>>></span> <span class='hs-varid'>parseDec</span><span class='hs-layout'>)</span>
<a name="line-279"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'o'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>chr</span> <span class='hs-varop'>$</span> <span class='hs-varid'>parseOct</span>
<a name="line-280"></a> <span class='hs-varid'>escape</span> <span class='hs-chr'>'x'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>chr</span> <span class='hs-varop'>$</span> <span class='hs-varid'>parseHex</span>
<a name="line-281"></a> <span class='hs-varid'>escape</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>isUpper</span> <span class='hs-varid'>c</span>
<a name="line-282"></a> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>mnemonic</span> <span class='hs-varid'>c</span>
<a name="line-283"></a> <span class='hs-varid'>escape</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"unrecognised escape sequence in literal char: \\"</span><span class='hs-varop'>++</span><span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-284"></a>
<a name="line-285"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'A'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'C'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'K'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ACK'</span>
<a name="line-286"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\ACK'"</span>
<a name="line-287"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'B'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'E'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'L'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\BEL'</span>
<a name="line-288"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-289"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'S'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\BS'</span>
<a name="line-290"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\BEL' or '\\BS'"</span>
<a name="line-291"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'C'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'R'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\CR'</span>
<a name="line-292"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-293"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'A'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'N'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\CAN'</span>
<a name="line-294"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\CR' or '\\CAN'"</span>
<a name="line-295"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'D'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'E'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'L'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DEL'</span>
<a name="line-296"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-297"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'L'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'E'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DLE'</span>
<a name="line-298"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-299"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'C'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-layout'>(</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'1'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DC1'</span>
<a name="line-300"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-301"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'2'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DC2'</span>
<a name="line-302"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-303"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'3'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DC3'</span>
<a name="line-304"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-305"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'4'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\DC4'</span> <span class='hs-layout'>)</span>
<a name="line-306"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\DEL' or '\\DLE' or '\\DC[1..4]'"</span>
<a name="line-307"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'E'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'T'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'X'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ETX'</span>
<a name="line-308"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-309"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'O'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'T'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\EOT'</span>
<a name="line-310"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-311"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'N'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'Q'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ENQ'</span>
<a name="line-312"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-313"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'T'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'B'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ETB'</span>
<a name="line-314"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-315"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'M'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\EM'</span>
<a name="line-316"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-317"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'S'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'C'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\ESC'</span>
<a name="line-318"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"one of '\\ETX' '\\EOT' '\\ENQ' '\\ETB' '\\EM' or '\\ESC'"</span>
<a name="line-319"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'F'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'F'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\FF'</span>
<a name="line-320"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-321"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'S'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\FS'</span>
<a name="line-322"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\FF' or '\\FS'"</span>
<a name="line-323"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'G'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'S'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\GS'</span>
<a name="line-324"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\GS'"</span>
<a name="line-325"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'H'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'T'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\HT'</span>
<a name="line-326"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\HT'"</span>
<a name="line-327"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'L'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'F'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\LF'</span>
<a name="line-328"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\LF'"</span>
<a name="line-329"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'N'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'U'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'L'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\NUL'</span>
<a name="line-330"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-331"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'A'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'K'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\NAK'</span>
<a name="line-332"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\NUL' or '\\NAK'"</span>
<a name="line-333"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'R'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'S'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\RS'</span>
<a name="line-334"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\RS'"</span>
<a name="line-335"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'S'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'O'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'H'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SOH'</span>
<a name="line-336"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-337"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'O'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SO'</span>
<a name="line-338"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-339"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'T'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'X'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\STX'</span>
<a name="line-340"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-341"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'I'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SI'</span>
<a name="line-342"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-343"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'Y'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'N'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SYN'</span>
<a name="line-344"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-345"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'U'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-chr'>'B'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SUB'</span>
<a name="line-346"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-347"></a> <span class='hs-keyword'>do</span> <span class='hs-chr'>'P'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\SP'</span>
<a name="line-348"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\SOH' '\\SO' '\\STX' '\\SI' '\\SYN' '\\SUB' or '\\SP'"</span>
<a name="line-349"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'U'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'S'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\US'</span>
<a name="line-350"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\US'"</span>
<a name="line-351"></a> <span class='hs-varid'>mnemonic</span> <span class='hs-chr'>'V'</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-chr'>'T'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>next</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-chr'>'\VT'</span>
<a name="line-352"></a> <span class='hs-varop'>`wrap`</span> <span class='hs-str'>"'\\VT'"</span>
<a name="line-353"></a> <span class='hs-varid'>wrap</span> <span class='hs-varid'>p</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p</span> <span class='hs-varop'>`onFail`</span> <span class='hs-varid'>fail</span> <span class='hs-layout'>(</span><span class='hs-str'>"expected literal char "</span><span class='hs-varop'>++</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-354"></a>
<a name="line-355"></a><span class='hs-comment'>-- Basic types</span>
<a name="line-356"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-conid'>Int</span> <span class='hs-keyword'>where</span>
<a name="line-357"></a> <span class='hs-comment'>-- parse = parseByRead "Int" -- convert from Integer, deals with minInt</span>
<a name="line-358"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>fmap</span> <span class='hs-varid'>fromInteger</span> <span class='hs-varop'>$</span>
<a name="line-359"></a> <span class='hs-keyword'>do</span> <span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isSpace</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-varid'>parseSigned</span> <span class='hs-varid'>parseDec</span>
<a name="line-360"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-conid'>Integer</span> <span class='hs-keyword'>where</span>
<a name="line-361"></a> <span class='hs-comment'>-- parse = parseByRead "Integer"</span>
<a name="line-362"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isSpace</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-varid'>parseSigned</span> <span class='hs-varid'>parseDec</span>
<a name="line-363"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-conid'>Float</span> <span class='hs-keyword'>where</span>
<a name="line-364"></a> <span class='hs-comment'>-- parse = parseByRead "Float"</span>
<a name="line-365"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isSpace</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-varid'>parseSigned</span> <span class='hs-varid'>parseFloat</span>
<a name="line-366"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-conid'>Double</span> <span class='hs-keyword'>where</span>
<a name="line-367"></a> <span class='hs-comment'>-- parse = parseByRead "Double"</span>
<a name="line-368"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isSpace</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-varid'>parseSigned</span> <span class='hs-varid'>parseFloat</span>
<a name="line-369"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-conid'>Char</span> <span class='hs-keyword'>where</span>
<a name="line-370"></a><span class='hs-comment'>-- parse = parseByRead "Char"</span>
<a name="line-371"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-varid'>satisfy</span> <span class='hs-varid'>isSpace</span><span class='hs-layout'>)</span><span class='hs-layout'>;</span> <span class='hs-varid'>parseLitChar</span>
<a name="line-372"></a> <span class='hs-comment'>-- parse = do { w <- word; if head w == '\'' then readLitChar (tail w)</span>
<a name="line-373"></a> <span class='hs-comment'>-- else fail "expected a char" }</span>
<a name="line-374"></a> <span class='hs-comment'>-- parseList = bracket (isWord "\"") (satisfy (=='"'))</span>
<a name="line-375"></a> <span class='hs-comment'>-- (many (satisfy (/='"')))</span>
<a name="line-376"></a> <span class='hs-comment'>-- not totally correct for strings...</span>
<a name="line-377"></a> <span class='hs-varid'>parseList</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>w</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>word</span><span class='hs-layout'>;</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>head</span> <span class='hs-varid'>w</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'"'</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>init</span> <span class='hs-layout'>(</span><span class='hs-varid'>tail</span> <span class='hs-varid'>w</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-378"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>fail</span> <span class='hs-str'>"not a string"</span> <span class='hs-layout'>}</span>
<a name="line-379"></a>
<a name="line-380"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-conid'>Bool</span> <span class='hs-keyword'>where</span>
<a name="line-381"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>enumeration</span> <span class='hs-str'>"Bool"</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>False</span><span class='hs-layout'>,</span><span class='hs-conid'>True</span><span class='hs-keyglyph'>]</span>
<a name="line-382"></a>
<a name="line-383"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-conid'>Ordering</span> <span class='hs-keyword'>where</span>
<a name="line-384"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>enumeration</span> <span class='hs-str'>"Ordering"</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>LT</span><span class='hs-layout'>,</span><span class='hs-conid'>EQ</span><span class='hs-layout'>,</span><span class='hs-conid'>GT</span><span class='hs-keyglyph'>]</span>
<a name="line-385"></a>
<a name="line-386"></a><span class='hs-comment'>-- Structural types</span>
<a name="line-387"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-conid'>()</span> <span class='hs-keyword'>where</span>
<a name="line-388"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-varid'>p</span>
<a name="line-389"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>p</span> <span class='hs-conid'>[]</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Failure</span> <span class='hs-conid'>[]</span> <span class='hs-str'>"no input: expected a ()"</span>
<a name="line-390"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-chr'>'('</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>dropWhile</span> <span class='hs-varid'>isSpace</span> <span class='hs-varid'>cs</span> <span class='hs-keyword'>of</span>
<a name="line-391"></a> <span class='hs-layout'>(</span><span class='hs-chr'>')'</span><span class='hs-conop'>:</span><span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Success</span> <span class='hs-varid'>s</span> <span class='hs-conid'>()</span>
<a name="line-392"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Failure</span> <span class='hs-varid'>cs</span> <span class='hs-str'>"Expected ) after ("</span>
<a name="line-393"></a> <span class='hs-varid'>p</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <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-varid'>p</span> <span class='hs-varid'>cs</span>
<a name="line-394"></a> <span class='hs-keyglyph'>|</span> <span class='hs-varid'>otherwise</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Failure</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span><span class='hs-conop'>:</span><span class='hs-varid'>cs</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-str'>"Expected a (), got "</span><span class='hs-varop'>++</span><span class='hs-varid'>show</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-395"></a>
<a name="line-396"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Parse</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Parse</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parse</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-397"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span><span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>"("</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"Opening a 2-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-398"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>parse</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"In 1st item of a 2-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-399"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>","</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"Separating a 2-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-400"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>parse</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"In 2nd item of a 2-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-401"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>")"</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"Closing a 2-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-402"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-403"></a>
<a name="line-404"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Parse</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Parse</span> <span class='hs-varid'>b</span><span class='hs-layout'>,</span> <span class='hs-conid'>Parse</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parse</span> <span class='hs-layout'>(</span><span class='hs-varid'>a</span><span class='hs-layout'>,</span><span class='hs-varid'>b</span><span class='hs-layout'>,</span><span class='hs-varid'>c</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-405"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span><span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>"("</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"Opening a 3-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-406"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>parse</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"In 1st item of a 3-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-407"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>","</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"Separating(1) a 3-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-408"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>y</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>parse</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"In 2nd item of a 3-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-409"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>","</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"Separating(2) a 3-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-410"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>z</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>parse</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"In 3rd item of a 3-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-411"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>")"</span> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-str'>"Closing a 3-tuple\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span>
<a name="line-412"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span><span class='hs-varid'>y</span><span class='hs-layout'>,</span><span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span>
<a name="line-413"></a>
<a name="line-414"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parse</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-varid'>a</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-415"></a> <span class='hs-varid'>parsePrec</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span>
<a name="line-416"></a> <span class='hs-varid'>optionalParens</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>"Nothing"</span><span class='hs-layout'>;</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-417"></a> <span class='hs-varop'>`onFail`</span>
<a name="line-418"></a> <span class='hs-varid'>parens</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-varop'>></span><span class='hs-num'>9</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>isWord</span> <span class='hs-str'>"Just"</span>
<a name="line-419"></a> <span class='hs-layout'>;</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>parsePrec</span> <span class='hs-num'>10</span>
<a name="line-420"></a> <span class='hs-varop'>`adjustErrBad`</span> <span class='hs-layout'>(</span><span class='hs-str'>"but within Just, "</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span> <span class='hs-layout'>}</span><span class='hs-layout'>)</span>
<a name="line-421"></a> <span class='hs-varop'>`adjustErr`</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-str'>"expected a Maybe (Just or Nothing)\n"</span><span class='hs-varop'>++</span><span class='hs-layout'>)</span><span class='hs-varop'>.</span><span class='hs-varid'>indent</span> <span class='hs-num'>2</span><span class='hs-layout'>)</span>
<a name="line-422"></a>
<a name="line-423"></a><span class='hs-keyword'>instance</span> <span class='hs-layout'>(</span><span class='hs-conid'>Parse</span> <span class='hs-varid'>a</span><span class='hs-layout'>,</span> <span class='hs-conid'>Parse</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parse</span> <span class='hs-layout'>(</span><span class='hs-conid'>Either</span> <span class='hs-varid'>a</span> <span class='hs-varid'>b</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-424"></a> <span class='hs-varid'>parsePrec</span> <span class='hs-varid'>p</span> <span class='hs-keyglyph'>=</span>
<a name="line-425"></a> <span class='hs-varid'>parens</span> <span class='hs-layout'>(</span><span class='hs-varid'>p</span><span class='hs-varop'>></span><span class='hs-num'>9</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span>
<a name="line-426"></a> <span class='hs-varid'>constructors</span> <span class='hs-keyglyph'>[</span> <span class='hs-layout'>(</span><span class='hs-str'>"Left"</span><span class='hs-layout'>,</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Left</span> <span class='hs-varop'>$</span> <span class='hs-varid'>parsePrec</span> <span class='hs-num'>10</span> <span class='hs-layout'>}</span> <span class='hs-layout'>)</span>
<a name="line-427"></a> <span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-str'>"Right"</span><span class='hs-layout'>,</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>{</span> <span class='hs-varid'>fmap</span> <span class='hs-conid'>Right</span> <span class='hs-varop'>$</span> <span class='hs-varid'>parsePrec</span> <span class='hs-num'>10</span> <span class='hs-layout'>}</span> <span class='hs-layout'>)</span>
<a name="line-428"></a> <span class='hs-keyglyph'>]</span>
<a name="line-429"></a>
<a name="line-430"></a><span class='hs-keyword'>instance</span> <span class='hs-conid'>Parse</span> <span class='hs-varid'>a</span> <span class='hs-keyglyph'>=></span> <span class='hs-conid'>Parse</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>a</span><span class='hs-keyglyph'>]</span> <span class='hs-keyword'>where</span>
<a name="line-431"></a> <span class='hs-varid'>parse</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>parseList</span>
<a name="line-432"></a>
<a name="line-433"></a><a name="allAsString"></a><span class='hs-comment'>-- | Simply return the entire remaining input String.</span>
<a name="line-434"></a><span class='hs-definition'>allAsString</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>TextParser</span> <span class='hs-conid'>String</span>
<a name="line-435"></a><span class='hs-definition'>allAsString</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>P</span> <span class='hs-layout'>(</span><span class='hs-keyglyph'>\</span><span class='hs-varid'>s</span><span class='hs-keyglyph'>-></span> <span class='hs-conid'>Success</span> <span class='hs-conid'>[]</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-436"></a>
<a name="line-437"></a><span class='hs-comment'>------------------------------------------------------------------------</span>
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