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<pre><a name="line-1"></a><span class='hs-comment'>{-# OPTIONS_GHC -fno-warn-missing-signatures #-}</span>
<a name="line-2"></a><span class='hs-comment'>-- | This is a POSIX version of parseRegex that allows NUL characters.</span>
<a name="line-3"></a><span class='hs-comment'>-- Lazy/Possessive/Backrefs are not recognized. Anchors ^ and $ are</span>
<a name="line-4"></a><span class='hs-comment'>-- recognized.</span>
<a name="line-5"></a><span class='hs-comment'>--</span>
<a name="line-6"></a><span class='hs-comment'>-- The PGroup returned always have (Maybe GroupIndex) set to (Just _)</span>
<a name="line-7"></a><span class='hs-comment'>-- and never to Nothing.</span>
<a name="line-8"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span><span class='hs-varop'>.</span><span class='hs-conid'>TDFA</span><span class='hs-varop'>.</span><span class='hs-conid'>ReadRegex</span> <span class='hs-layout'>(</span><span class='hs-varid'>parseRegex</span><span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-9"></a>
<a name="line-10"></a><span class='hs-comment'>{- By Chris Kuklewicz, 2007. BSD License, see the LICENSE file. -}</span>
<a name="line-11"></a>
<a name="line-12"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Regex</span><span class='hs-varop'>.</span><span class='hs-conid'>TDFA</span><span class='hs-varop'>.</span><span class='hs-conid'>Pattern</span> <span class='hs-comment'>{- all -}</span>
<a name="line-13"></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'>Parsec</span><span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varop'><|></span><span class='hs-layout'>)</span><span class='hs-layout'>,</span> <span class='hs-layout'>(</span><span class='hs-varop'><?></span><span class='hs-layout'>)</span><span class='hs-layout'>,</span>
<a name="line-14"></a> <span class='hs-varid'>unexpected</span><span class='hs-layout'>,</span> <span class='hs-varid'>try</span><span class='hs-layout'>,</span> <span class='hs-varid'>runParser</span><span class='hs-layout'>,</span> <span class='hs-varid'>many</span><span class='hs-layout'>,</span> <span class='hs-varid'>getState</span><span class='hs-layout'>,</span> <span class='hs-varid'>setState</span><span class='hs-layout'>,</span> <span class='hs-conid'>CharParser</span><span class='hs-layout'>,</span> <span class='hs-conid'>ParseError</span><span class='hs-layout'>,</span>
<a name="line-15"></a> <span class='hs-varid'>sepBy1</span><span class='hs-layout'>,</span> <span class='hs-varid'>option</span><span class='hs-layout'>,</span> <span class='hs-varid'>notFollowedBy</span><span class='hs-layout'>,</span> <span class='hs-varid'>many1</span><span class='hs-layout'>,</span> <span class='hs-varid'>lookAhead</span><span class='hs-layout'>,</span> <span class='hs-varid'>eof</span><span class='hs-layout'>,</span> <span class='hs-varid'>between</span><span class='hs-layout'>,</span>
<a name="line-16"></a> <span class='hs-varid'>string</span><span class='hs-layout'>,</span> <span class='hs-varid'>noneOf</span><span class='hs-layout'>,</span> <span class='hs-varid'>digit</span><span class='hs-layout'>,</span> <span class='hs-varid'>char</span><span class='hs-layout'>,</span> <span class='hs-varid'>anyChar</span><span class='hs-layout'>)</span>
<a name="line-17"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Control</span><span class='hs-varop'>.</span><span class='hs-conid'>Monad</span><span class='hs-layout'>(</span><span class='hs-varid'>liftM</span><span class='hs-layout'>,</span> <span class='hs-varid'>when</span><span class='hs-layout'>,</span> <span class='hs-varid'>guard</span><span class='hs-layout'>)</span>
<a name="line-18"></a><span class='hs-keyword'>import</span> <span class='hs-keyword'>qualified</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Set</span> <span class='hs-keyword'>as</span> <span class='hs-conid'>Set</span><span class='hs-layout'>(</span><span class='hs-varid'>fromList</span><span class='hs-layout'>)</span>
<a name="line-19"></a>
<a name="line-20"></a><a name="BracketElement"></a><span class='hs-comment'>-- | BracketElement is internal to this module</span>
<a name="line-21"></a><a name="BracketElement"></a><span class='hs-keyword'>data</span> <span class='hs-conid'>BracketElement</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>BEChar</span> <span class='hs-conid'>Char</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEChars</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEColl</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEEquiv</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEClass</span> <span class='hs-conid'>String</span>
<a name="line-22"></a>
<a name="line-23"></a><a name="parseRegex"></a><span class='hs-comment'>-- | Return either an error message or a tuple of the Pattern and the</span>
<a name="line-24"></a><span class='hs-comment'>-- largest group index and the largest DoPa index (both have smallest</span>
<a name="line-25"></a><span class='hs-comment'>-- index of 1). Since the regular expression is supplied as [Char] it</span>
<a name="line-26"></a><span class='hs-comment'>-- automatically supports unicode and '\NUL' characters.</span>
<a name="line-27"></a><span class='hs-definition'>parseRegex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Either</span> <span class='hs-conid'>ParseError</span> <span class='hs-layout'>(</span><span class='hs-conid'>Pattern</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-conid'>GroupIndex</span><span class='hs-layout'>,</span><span class='hs-conid'>DoPa</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-28"></a><span class='hs-definition'>parseRegex</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>runParser</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-varid'>pat</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>p_regex</span>
<a name="line-29"></a> <span class='hs-varid'>eof</span>
<a name="line-30"></a> <span class='hs-layout'>(</span><span class='hs-varid'>lastGroupIndex</span><span class='hs-layout'>,</span><span class='hs-varid'>lastDopa</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getState</span>
<a name="line-31"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>pat</span><span class='hs-layout'>,</span><span class='hs-layout'>(</span><span class='hs-varid'>lastGroupIndex</span><span class='hs-layout'>,</span><span class='hs-conid'>DoPa</span> <span class='hs-varid'>lastDopa</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-num'>0</span><span class='hs-layout'>,</span><span class='hs-num'>0</span><span class='hs-layout'>)</span> <span class='hs-varid'>x</span> <span class='hs-varid'>x</span>
<a name="line-32"></a>
<a name="line-33"></a><a name="p_regex"></a><span class='hs-definition'>p_regex</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-layout'>(</span><span class='hs-conid'>GroupIndex</span><span class='hs-layout'>,</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-conid'>Pattern</span>
<a name="line-34"></a><span class='hs-definition'>p_regex</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>POr</span> <span class='hs-varop'>$</span> <span class='hs-varid'>sepBy1</span> <span class='hs-varid'>p_branch</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'|'</span><span class='hs-layout'>)</span>
<a name="line-35"></a>
<a name="line-36"></a><a name="p_branch"></a><span class='hs-comment'>-- man re_format helps alot, it says one-or-more pieces so this is</span>
<a name="line-37"></a><span class='hs-comment'>-- many1 not many. Use "()" to indicate an empty piece.</span>
<a name="line-38"></a><span class='hs-definition'>p_branch</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>PConcat</span> <span class='hs-varop'>$</span> <span class='hs-varid'>many1</span> <span class='hs-varid'>p_piece</span>
<a name="line-39"></a>
<a name="line-40"></a><a name="p_piece"></a><span class='hs-definition'>p_piece</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_anchor</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_atom</span><span class='hs-layout'>)</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>p_post_atom</span> <span class='hs-comment'>-- correct specification</span>
<a name="line-41"></a>
<a name="line-42"></a><a name="p_atom"></a><span class='hs-definition'>p_atom</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p_group</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_bracket</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_char</span> <span class='hs-varop'><?></span> <span class='hs-str'>"an atom"</span>
<a name="line-43"></a>
<a name="line-44"></a><a name="group_index"></a><span class='hs-definition'>group_index</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>CharParser</span> <span class='hs-layout'>(</span><span class='hs-conid'>GroupIndex</span><span class='hs-layout'>,</span><span class='hs-conid'>Int</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-conid'>Maybe</span> <span class='hs-conid'>GroupIndex</span><span class='hs-layout'>)</span>
<a name="line-45"></a><span class='hs-definition'>group_index</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-46"></a> <span class='hs-layout'>(</span><span class='hs-varid'>gi</span><span class='hs-layout'>,</span><span class='hs-varid'>ci</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getState</span>
<a name="line-47"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>index</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>succ</span> <span class='hs-varid'>gi</span>
<a name="line-48"></a> <span class='hs-varid'>setState</span> <span class='hs-layout'>(</span><span class='hs-varid'>index</span><span class='hs-layout'>,</span><span class='hs-varid'>ci</span><span class='hs-layout'>)</span>
<a name="line-49"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>index</span><span class='hs-layout'>)</span>
<a name="line-50"></a>
<a name="line-51"></a><a name="p_group"></a><span class='hs-definition'>p_group</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>lookAhead</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'('</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-keyword'>do</span>
<a name="line-52"></a> <span class='hs-varid'>index</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>group_index</span>
<a name="line-53"></a> <span class='hs-varid'>liftM</span> <span class='hs-layout'>(</span><span class='hs-conid'>PGroup</span> <span class='hs-varid'>index</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>between</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'('</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>')'</span><span class='hs-layout'>)</span> <span class='hs-varid'>p_regex</span>
<a name="line-54"></a>
<a name="line-55"></a><a name="p_post_atom"></a><span class='hs-comment'>-- p_post_atom takes the previous atom as a parameter</span>
<a name="line-56"></a><span class='hs-definition'>p_post_atom</span> <span class='hs-varid'>atom</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'?'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>PQuest</span> <span class='hs-varid'>atom</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-57"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'+'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>PPlus</span> <span class='hs-varid'>atom</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-58"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'*'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>PStar</span> <span class='hs-conid'>True</span> <span class='hs-varid'>atom</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-59"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>p_bound</span> <span class='hs-varid'>atom</span>
<a name="line-60"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>return</span> <span class='hs-varid'>atom</span>
<a name="line-61"></a>
<a name="line-62"></a><a name="p_bound"></a><span class='hs-definition'>p_bound</span> <span class='hs-varid'>atom</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-varid'>between</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'{'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'}'</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>p_bound_spec</span> <span class='hs-varid'>atom</span><span class='hs-layout'>)</span>
<a name="line-63"></a>
<a name="line-64"></a><a name="p_bound_spec"></a><span class='hs-definition'>p_bound_spec</span> <span class='hs-varid'>atom</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>lowS</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many1</span> <span class='hs-varid'>digit</span>
<a name="line-65"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>lowI</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>read</span> <span class='hs-varid'>lowS</span>
<a name="line-66"></a> <span class='hs-varid'>highMI</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>option</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-varid'>lowI</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-67"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>char</span> <span class='hs-chr'>','</span>
<a name="line-68"></a> <span class='hs-comment'>-- parsec note: if 'many digits' fails below then the 'try' ensures</span>
<a name="line-69"></a> <span class='hs-comment'>-- that the ',' will not match the closing '}' in p_bound, same goes</span>
<a name="line-70"></a> <span class='hs-comment'>-- for any non '}' garbage after the 'many digits'.</span>
<a name="line-71"></a> <span class='hs-varid'>highS</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many</span> <span class='hs-varid'>digit</span>
<a name="line-72"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>highS</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-conid'>Nothing</span> <span class='hs-comment'>-- no upper bound</span>
<a name="line-73"></a> <span class='hs-keyword'>else</span> <span class='hs-keyword'>do</span> <span class='hs-keyword'>let</span> <span class='hs-varid'>highI</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>read</span> <span class='hs-varid'>highS</span>
<a name="line-74"></a> <span class='hs-varid'>guard</span> <span class='hs-layout'>(</span><span class='hs-varid'>lowI</span> <span class='hs-varop'><=</span> <span class='hs-varid'>highI</span><span class='hs-layout'>)</span>
<a name="line-75"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-varid'>read</span> <span class='hs-varid'>highS</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-76"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>PBound</span> <span class='hs-varid'>lowI</span> <span class='hs-varid'>highMI</span> <span class='hs-varid'>atom</span><span class='hs-layout'>)</span>
<a name="line-77"></a>
<a name="line-78"></a><a name="p_anchor"></a><span class='hs-comment'>-- An anchor cannot be modified by a repetition specifier</span>
<a name="line-79"></a><span class='hs-definition'>p_anchor</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'^'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>PCarat</span> <span class='hs-varid'>char_index</span><span class='hs-layout'>)</span>
<a name="line-80"></a> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'$'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>PDollar</span> <span class='hs-varid'>char_index</span><span class='hs-layout'>)</span>
<a name="line-81"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-keyword'>do</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>string</span> <span class='hs-str'>"()"</span>
<a name="line-82"></a> <span class='hs-varid'>index</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>group_index</span>
<a name="line-83"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-conid'>PGroup</span> <span class='hs-varid'>index</span> <span class='hs-conid'>PEmpty</span><span class='hs-layout'>)</span>
<a name="line-84"></a> <span class='hs-varop'><?></span> <span class='hs-str'>"empty () or anchor ^ or $"</span>
<a name="line-85"></a>
<a name="line-86"></a><a name="char_index"></a><span class='hs-definition'>char_index</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-layout'>(</span><span class='hs-varid'>gi</span><span class='hs-layout'>,</span><span class='hs-varid'>ci</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>getState</span>
<a name="line-87"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>ci'</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>succ</span> <span class='hs-varid'>ci</span>
<a name="line-88"></a> <span class='hs-varid'>setState</span> <span class='hs-layout'>(</span><span class='hs-varid'>gi</span><span class='hs-layout'>,</span><span class='hs-varid'>ci'</span><span class='hs-layout'>)</span>
<a name="line-89"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>DoPa</span> <span class='hs-varid'>ci'</span><span class='hs-layout'>)</span>
<a name="line-90"></a>
<a name="line-91"></a><a name="p_char"></a><span class='hs-definition'>p_char</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p_dot</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_left_brace</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_escaped</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_other_char</span> <span class='hs-keyword'>where</span>
<a name="line-92"></a> <span class='hs-varid'>p_dot</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'.'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>char_index</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-conid'>PDot</span>
<a name="line-93"></a> <span class='hs-varid'>p_left_brace</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'{'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>notFollowedBy</span> <span class='hs-varid'>digit</span> <span class='hs-varop'>>></span> <span class='hs-varid'>char_index</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>`PChar`</span> <span class='hs-chr'>'{'</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-94"></a> <span class='hs-varid'>p_escaped</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'\\'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>anyChar</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-varid'>char_index</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>`PEscape`</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-95"></a> <span class='hs-varid'>p_other_char</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>noneOf</span> <span class='hs-varid'>specials</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-varid'>char_index</span> <span class='hs-varop'>>>=</span> <span class='hs-varid'>return</span> <span class='hs-varop'>.</span> <span class='hs-layout'>(</span><span class='hs-varop'>`PChar`</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-96"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>specials</span> <span class='hs-keyglyph'>=</span> <span class='hs-str'>"^.[$()|*+?{\\"</span>
<a name="line-97"></a>
<a name="line-98"></a><a name="p_bracket"></a><span class='hs-comment'>-- parse [bar] and [^bar] sets of characters</span>
<a name="line-99"></a><span class='hs-definition'>p_bracket</span> <span class='hs-keyglyph'>=</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'['</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-layout'>(</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'^'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>p_set</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>p_set</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span> <span class='hs-layout'>)</span>
<a name="line-100"></a>
<a name="line-101"></a><a name="p_set"></a><span class='hs-comment'>-- p_set :: Bool -> GenParser Char st Pattern</span>
<a name="line-102"></a><span class='hs-definition'>p_set</span> <span class='hs-varid'>invert</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span> <span class='hs-varid'>initial</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>option</span> <span class='hs-str'>""</span> <span class='hs-layout'>(</span><span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>']'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-str'>"]"</span><span class='hs-layout'>)</span> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>'-'</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-str'>"-"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-103"></a> <span class='hs-varid'>values</span> <span class='hs-keyglyph'><-</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>initial</span> <span class='hs-keyword'>then</span> <span class='hs-varid'>many1</span> <span class='hs-varid'>p_set_elem</span> <span class='hs-keyword'>else</span> <span class='hs-varid'>many</span> <span class='hs-varid'>p_set_elem</span>
<a name="line-104"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>char</span> <span class='hs-chr'>']'</span>
<a name="line-105"></a> <span class='hs-varid'>ci</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>char_index</span>
<a name="line-106"></a> <span class='hs-keyword'>let</span> <span class='hs-varid'>chars</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe'set</span> <span class='hs-varop'>$</span> <span class='hs-varid'>initial</span>
<a name="line-107"></a> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>c</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEChar</span> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>values</span> <span class='hs-keyglyph'>]</span>
<a name="line-108"></a> <span class='hs-varop'>++</span> <span class='hs-varid'>concat</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>s</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEChars</span> <span class='hs-varid'>s</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>values</span> <span class='hs-keyglyph'>]</span>
<a name="line-109"></a> <span class='hs-varid'>colls</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe'set</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PatternSetCollatingElement</span> <span class='hs-varid'>coll</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEColl</span> <span class='hs-varid'>coll</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>values</span> <span class='hs-keyglyph'>]</span>
<a name="line-110"></a> <span class='hs-varid'>equivs</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe'set</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PatternSetEquivalenceClass</span> <span class='hs-varid'>equiv</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEEquiv</span> <span class='hs-varid'>equiv</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>values</span><span class='hs-keyglyph'>]</span>
<a name="line-111"></a> <span class='hs-varid'>class's</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>maybe'set</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>PatternSetCharacterClass</span> <span class='hs-varid'>a'class</span> <span class='hs-keyglyph'>|</span> <span class='hs-conid'>BEClass</span> <span class='hs-varid'>a'class</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>values</span><span class='hs-keyglyph'>]</span>
<a name="line-112"></a> <span class='hs-varid'>maybe'set</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>null</span> <span class='hs-varid'>x</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>Nothing</span> <span class='hs-keyword'>else</span> <span class='hs-conid'>Just</span> <span class='hs-layout'>(</span><span class='hs-conid'>Set</span><span class='hs-varop'>.</span><span class='hs-varid'>fromList</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span>
<a name="line-113"></a> <span class='hs-varid'>sets</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>PatternSet</span> <span class='hs-varid'>chars</span> <span class='hs-varid'>class's</span> <span class='hs-varid'>colls</span> <span class='hs-varid'>equivs</span>
<a name="line-114"></a> <span class='hs-varid'>sets</span> <span class='hs-varop'>`seq`</span> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>if</span> <span class='hs-varid'>invert</span> <span class='hs-keyword'>then</span> <span class='hs-conid'>PAnyNot</span> <span class='hs-varid'>ci</span> <span class='hs-varid'>sets</span> <span class='hs-keyword'>else</span> <span class='hs-conid'>PAny</span> <span class='hs-varid'>ci</span> <span class='hs-varid'>sets</span>
<a name="line-115"></a>
<a name="line-116"></a><span class='hs-comment'>-- From here down the code is the parser and functions for pattern [ ] set things</span>
<a name="line-117"></a>
<a name="line-118"></a><a name="p_set_elem"></a><span class='hs-definition'>p_set_elem</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>p_set_elem_class</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_set_elem_equiv</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_set_elem_coll</span>
<a name="line-119"></a> <span class='hs-varop'><|></span> <span class='hs-varid'>p_set_elem_range</span> <span class='hs-varop'><|></span> <span class='hs-varid'>p_set_elem_char</span> <span class='hs-varop'><?></span> <span class='hs-str'>"Failed to parse bracketed string"</span>
<a name="line-120"></a>
<a name="line-121"></a><a name="p_set_elem_class"></a><span class='hs-definition'>p_set_elem_class</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>BEClass</span> <span class='hs-varop'>$</span>
<a name="line-122"></a> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>between</span> <span class='hs-layout'>(</span><span class='hs-varid'>string</span> <span class='hs-str'>"[:"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>string</span> <span class='hs-str'>":]"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>many1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>noneOf</span> <span class='hs-str'>":]"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-123"></a>
<a name="line-124"></a><a name="p_set_elem_equiv"></a><span class='hs-definition'>p_set_elem_equiv</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>BEEquiv</span> <span class='hs-varop'>$</span>
<a name="line-125"></a> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>between</span> <span class='hs-layout'>(</span><span class='hs-varid'>string</span> <span class='hs-str'>"[="</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>string</span> <span class='hs-str'>"=]"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>many1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>noneOf</span> <span class='hs-str'>"=]"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-126"></a>
<a name="line-127"></a><a name="p_set_elem_coll"></a><span class='hs-definition'>p_set_elem_coll</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>liftM</span> <span class='hs-conid'>BEColl</span> <span class='hs-varop'>$</span>
<a name="line-128"></a> <span class='hs-varid'>try</span> <span class='hs-layout'>(</span><span class='hs-varid'>between</span> <span class='hs-layout'>(</span><span class='hs-varid'>string</span> <span class='hs-str'>"[."</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>string</span> <span class='hs-str'>".]"</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>many1</span> <span class='hs-varop'>$</span> <span class='hs-varid'>noneOf</span> <span class='hs-str'>".]"</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span>
<a name="line-129"></a>
<a name="line-130"></a><a name="p_set_elem_range"></a><span class='hs-definition'>p_set_elem_range</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-131"></a> <span class='hs-varid'>start</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>noneOf</span> <span class='hs-str'>"]-"</span>
<a name="line-132"></a> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>char</span> <span class='hs-chr'>'-'</span>
<a name="line-133"></a> <span class='hs-varid'>end</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>noneOf</span> <span class='hs-str'>"]"</span>
<a name="line-134"></a> <span class='hs-comment'>-- bug fix: check start <= end before "return (BEChars [start..end])"</span>
<a name="line-135"></a> <span class='hs-keyword'>if</span> <span class='hs-varid'>start</span> <span class='hs-varop'><=</span> <span class='hs-varid'>end</span>
<a name="line-136"></a> <span class='hs-keyword'>then</span> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>BEChars</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>start</span><span class='hs-keyglyph'>..</span><span class='hs-varid'>end</span><span class='hs-keyglyph'>]</span><span class='hs-layout'>)</span>
<a name="line-137"></a> <span class='hs-keyword'>else</span> <span class='hs-varid'>unexpected</span> <span class='hs-str'>"End point of dashed character range is less than starting point"</span>
<a name="line-138"></a>
<a name="line-139"></a><a name="p_set_elem_char"></a><span class='hs-definition'>p_set_elem_char</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-140"></a> <span class='hs-varid'>c</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>noneOf</span> <span class='hs-str'>"]"</span>
<a name="line-141"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>c</span> <span class='hs-varop'>==</span> <span class='hs-chr'>'-'</span><span class='hs-layout'>)</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-142"></a> <span class='hs-varid'>atEnd</span> <span class='hs-keyglyph'><-</span> <span class='hs-layout'>(</span><span class='hs-varid'>lookAhead</span> <span class='hs-layout'>(</span><span class='hs-varid'>char</span> <span class='hs-chr'>']'</span><span class='hs-layout'>)</span> <span class='hs-varop'>>></span> <span class='hs-varid'>return</span> <span class='hs-conid'>True</span><span class='hs-layout'>)</span> <span class='hs-varop'><|></span> <span class='hs-layout'>(</span><span class='hs-varid'>return</span> <span class='hs-conid'>False</span><span class='hs-layout'>)</span>
<a name="line-143"></a> <span class='hs-varid'>when</span> <span class='hs-layout'>(</span><span class='hs-varid'>not</span> <span class='hs-varid'>atEnd</span><span class='hs-layout'>)</span> <span class='hs-layout'>(</span><span class='hs-varid'>unexpected</span> <span class='hs-str'>"A dash is in the wrong place in a bracket"</span><span class='hs-layout'>)</span>
<a name="line-144"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-conid'>BEChar</span> <span class='hs-varid'>c</span><span class='hs-layout'>)</span>
<a name="line-145"></a>
</pre></body>
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