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<title>src/Text/Pandoc/CharacterReferences.hs</title>
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<pre><a name="line-1"></a><span class='hs-comment'>{-
<a name="line-2"></a>Copyright (C) 2006-2010 John MacFarlane <jgm@berkeley.edu>
<a name="line-3"></a>
<a name="line-4"></a>This program is free software; you can redistribute it and/or modify
<a name="line-5"></a>it under the terms of the GNU General Public License as published by
<a name="line-6"></a>the Free Software Foundation; either version 2 of the License, or
<a name="line-7"></a>(at your option) any later version.
<a name="line-8"></a>
<a name="line-9"></a>This program is distributed in the hope that it will be useful,
<a name="line-10"></a>but WITHOUT ANY WARRANTY; without even the implied warranty of
<a name="line-11"></a>MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
<a name="line-12"></a>GNU General Public License for more details.
<a name="line-13"></a>
<a name="line-14"></a>You should have received a copy of the GNU General Public License
<a name="line-15"></a>along with this program; if not, write to the Free Software
<a name="line-16"></a>Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
<a name="line-17"></a>-}</span>
<a name="line-18"></a>
<a name="line-19"></a><span class='hs-comment'>{- |
<a name="line-20"></a> Module : Text.Pandoc.CharacterReferences
<a name="line-21"></a> Copyright : Copyright (C) 2006-2010 John MacFarlane
<a name="line-22"></a> License : GNU GPL, version 2 or above
<a name="line-23"></a>
<a name="line-24"></a> Maintainer : John MacFarlane <jgm@berkeley.edu>
<a name="line-25"></a> Stability : alpha
<a name="line-26"></a> Portability : portable
<a name="line-27"></a>
<a name="line-28"></a>Functions for parsing character references.
<a name="line-29"></a>-}</span>
<a name="line-30"></a><span class='hs-keyword'>module</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>Pandoc</span><span class='hs-varop'>.</span><span class='hs-conid'>CharacterReferences</span> <span class='hs-layout'>(</span>
<a name="line-31"></a> <span class='hs-varid'>characterReference</span><span class='hs-layout'>,</span>
<a name="line-32"></a> <span class='hs-varid'>decodeCharacterReferences</span><span class='hs-layout'>,</span>
<a name="line-33"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-34"></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>
<a name="line-35"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Text</span><span class='hs-varop'>.</span><span class='hs-conid'>HTML</span><span class='hs-varop'>.</span><span class='hs-conid'>TagSoup</span><span class='hs-varop'>.</span><span class='hs-conid'>Entity</span> <span class='hs-layout'>(</span> <span class='hs-varid'>lookupNamedEntity</span><span class='hs-layout'>,</span> <span class='hs-varid'>lookupNumericEntity</span> <span class='hs-layout'>)</span>
<a name="line-36"></a><span class='hs-keyword'>import</span> <span class='hs-conid'>Data</span><span class='hs-varop'>.</span><span class='hs-conid'>Maybe</span> <span class='hs-layout'>(</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-layout'>)</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="characterReference"></a><span class='hs-comment'>-- | Parse character entity.</span>
<a name="line-39"></a><span class='hs-definition'>characterReference</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GenParser</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>st</span> <span class='hs-conid'>Char</span>
<a name="line-40"></a><span class='hs-definition'>characterReference</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>try</span> <span class='hs-varop'>$</span> <span class='hs-keyword'>do</span>
<a name="line-41"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>'&'</span>
<a name="line-42"></a> <span class='hs-varid'>character</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>numRef</span> <span class='hs-varop'><|></span> <span class='hs-varid'>entity</span>
<a name="line-43"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>';'</span>
<a name="line-44"></a> <span class='hs-varid'>return</span> <span class='hs-varid'>character</span>
<a name="line-45"></a>
<a name="line-46"></a><a name="numRef"></a><span class='hs-definition'>numRef</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GenParser</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>st</span> <span class='hs-conid'>Char</span>
<a name="line-47"></a><span class='hs-definition'>numRef</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-48"></a> <span class='hs-varid'>char</span> <span class='hs-chr'>'#'</span>
<a name="line-49"></a> <span class='hs-varid'>num</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>hexNum</span> <span class='hs-varop'><|></span> <span class='hs-varid'>decNum</span>
<a name="line-50"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-chr'>'?'</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lookupNumericEntity</span> <span class='hs-varid'>num</span>
<a name="line-51"></a>
<a name="line-52"></a><a name="hexNum"></a><span class='hs-definition'>hexNum</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GenParser</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>st</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span>
<a name="line-53"></a><span class='hs-definition'>hexNum</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-54"></a> <span class='hs-varid'>x</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>oneOf</span> <span class='hs-str'>"Xx"</span>
<a name="line-55"></a> <span class='hs-varid'>num</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many1</span> <span class='hs-varid'>hexDigit</span>
<a name="line-56"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>x</span><span class='hs-conop'>:</span><span class='hs-varid'>num</span><span class='hs-layout'>)</span>
<a name="line-57"></a>
<a name="line-58"></a><a name="decNum"></a><span class='hs-definition'>decNum</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GenParser</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>st</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Char</span><span class='hs-keyglyph'>]</span>
<a name="line-59"></a><span class='hs-definition'>decNum</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>many1</span> <span class='hs-varid'>digit</span>
<a name="line-60"></a>
<a name="line-61"></a><a name="entity"></a><span class='hs-definition'>entity</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>GenParser</span> <span class='hs-conid'>Char</span> <span class='hs-varid'>st</span> <span class='hs-conid'>Char</span>
<a name="line-62"></a><span class='hs-definition'>entity</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-63"></a> <span class='hs-varid'>body</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>many1</span> <span class='hs-varid'>alphaNum</span>
<a name="line-64"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>fromMaybe</span> <span class='hs-chr'>'?'</span> <span class='hs-varop'>$</span> <span class='hs-varid'>lookupNamedEntity</span> <span class='hs-varid'>body</span>
<a name="line-65"></a>
<a name="line-66"></a><a name="decodeCharacterReferences"></a><span class='hs-comment'>-- | Convert entities in a string to characters.</span>
<a name="line-67"></a><span class='hs-definition'>decodeCharacterReferences</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>String</span>
<a name="line-68"></a><span class='hs-definition'>decodeCharacterReferences</span> <span class='hs-varid'>str</span> <span class='hs-keyglyph'>=</span>
<a name="line-69"></a> <span class='hs-keyword'>case</span> <span class='hs-varid'>parse</span> <span class='hs-layout'>(</span><span class='hs-varid'>many</span> <span class='hs-layout'>(</span><span class='hs-varid'>characterReference</span> <span class='hs-varop'><|></span> <span class='hs-varid'>anyChar</span><span class='hs-layout'>)</span><span class='hs-layout'>)</span> <span class='hs-varid'>str</span> <span class='hs-varid'>str</span> <span class='hs-keyword'>of</span>
<a name="line-70"></a> <span class='hs-conid'>Left</span> <span class='hs-varid'>err</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>error</span> <span class='hs-varop'>$</span> <span class='hs-str'>"\nError: "</span> <span class='hs-varop'>++</span> <span class='hs-varid'>show</span> <span class='hs-varid'>err</span>
<a name="line-71"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>result</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>result</span>
<a name="line-72"></a>
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