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<pre><a name="line-1"></a><span class='hs-comment'>{-
<a name="line-2"></a>Copyright (C) 2007-2010 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.Readers.TeXMath
<a name="line-21"></a> Copyright : Copyright (C) 2007-2010 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>Conversion of TeX math to a list of 'Pandoc' inline elements.
<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'>Readers</span><span class='hs-varop'>.</span><span class='hs-conid'>TeXMath</span> <span class='hs-layout'>(</span>
<a name="line-31"></a> <span class='hs-varid'>readTeXMath</span>
<a name="line-32"></a> <span class='hs-layout'>)</span> <span class='hs-keyword'>where</span>
<a name="line-33"></a>
<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'>Pandoc</span><span class='hs-varop'>.</span><span class='hs-conid'>Definition</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'>TeXMath</span><span class='hs-varop'>.</span><span class='hs-conid'>Parser</span>
<a name="line-37"></a>
<a name="line-38"></a><a name="readTeXMath"></a><span class='hs-comment'>-- | Converts a raw TeX math formula to a list of 'Pandoc' inlines.</span>
<a name="line-39"></a><span class='hs-comment'>-- Defaults to raw formula between @$@ characters if entire formula</span>
<a name="line-40"></a><span class='hs-comment'>-- can't be converted.</span>
<a name="line-41"></a><span class='hs-definition'>readTeXMath</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ String to parse (assumes @'\n'@ line endings)</span>
<a name="line-42"></a> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Inline</span><span class='hs-keyglyph'>]</span>
<a name="line-43"></a><span class='hs-definition'>readTeXMath</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>readTeXMath'</span> <span class='hs-varid'>inp</span> <span class='hs-keyword'>of</span>
<a name="line-44"></a> <span class='hs-conid'>Nothing</span> <span class='hs-keyglyph'>-></span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-layout'>(</span><span class='hs-str'>"$"</span> <span class='hs-varop'>++</span> <span class='hs-varid'>inp</span> <span class='hs-varop'>++</span> <span class='hs-str'>"$"</span><span class='hs-layout'>)</span><span class='hs-keyglyph'>]</span>
<a name="line-45"></a> <span class='hs-conid'>Just</span> <span class='hs-varid'>res</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>res</span>
<a name="line-46"></a>
<a name="line-47"></a><a name="readTeXMath'"></a><span class='hs-comment'>-- | Like 'readTeXMath', but without the default.</span>
<a name="line-48"></a><span class='hs-definition'>readTeXMath'</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>String</span> <span class='hs-comment'>-- ^ String to parse (assumes @'\n'@ line endings)</span>
<a name="line-49"></a> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Inline</span><span class='hs-keyglyph'>]</span>
<a name="line-50"></a><span class='hs-definition'>readTeXMath'</span> <span class='hs-varid'>inp</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>case</span> <span class='hs-varid'>parse</span> <span class='hs-varid'>formula</span> <span class='hs-str'>"formula"</span> <span class='hs-varid'>inp</span> <span class='hs-keyword'>of</span>
<a name="line-51"></a> <span class='hs-conid'>Left</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-varid'>inp</span><span class='hs-keyglyph'>]</span>
<a name="line-52"></a> <span class='hs-conid'>Right</span> <span class='hs-varid'>exps</span> <span class='hs-keyglyph'>-></span> <span class='hs-varid'>expsToInlines</span> <span class='hs-varid'>exps</span>
<a name="line-53"></a>
<a name="line-54"></a><a name="expsToInlines"></a><span class='hs-definition'>expsToInlines</span> <span class='hs-keyglyph'>::</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Exp</span><span class='hs-keyglyph'>]</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Inline</span><span class='hs-keyglyph'>]</span>
<a name="line-55"></a><span class='hs-definition'>expsToInlines</span> <span class='hs-varid'>xs</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-56"></a> <span class='hs-varid'>res</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>mapM</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>xs</span>
<a name="line-57"></a> <span class='hs-varid'>return</span> <span class='hs-layout'>(</span><span class='hs-varid'>concat</span> <span class='hs-varid'>res</span><span class='hs-layout'>)</span>
<a name="line-58"></a>
<a name="line-59"></a><a name="expToInlines"></a><span class='hs-definition'>expToInlines</span> <span class='hs-keyglyph'>::</span> <span class='hs-conid'>Exp</span> <span class='hs-keyglyph'>-></span> <span class='hs-conid'>Maybe</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Inline</span><span class='hs-keyglyph'>]</span>
<a name="line-60"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ENumber</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-varid'>s</span><span class='hs-keyglyph'>]</span>
<a name="line-61"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EIdentifier</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Emph</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-varid'>s</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-62"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EMathOperator</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-varid'>s</span><span class='hs-keyglyph'>]</span>
<a name="line-63"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ESymbol</span> <span class='hs-varid'>t</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-varop'>$</span> <span class='hs-varid'>addSpace</span> <span class='hs-varid'>t</span> <span class='hs-layout'>(</span><span class='hs-conid'>Str</span> <span class='hs-varid'>s</span><span class='hs-layout'>)</span>
<a name="line-64"></a> <span class='hs-keyword'>where</span> <span class='hs-varid'>addSpace</span> <span class='hs-conid'>Op</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>thinspace</span><span class='hs-keyglyph'>]</span>
<a name="line-65"></a> <span class='hs-varid'>addSpace</span> <span class='hs-conid'>Bin</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>medspace</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>medspace</span><span class='hs-keyglyph'>]</span>
<a name="line-66"></a> <span class='hs-varid'>addSpace</span> <span class='hs-conid'>Rel</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>widespace</span><span class='hs-layout'>,</span> <span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>widespace</span><span class='hs-keyglyph'>]</span>
<a name="line-67"></a> <span class='hs-varid'>addSpace</span> <span class='hs-conid'>Pun</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-layout'>,</span> <span class='hs-varid'>thinspace</span><span class='hs-keyglyph'>]</span>
<a name="line-68"></a> <span class='hs-varid'>addSpace</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyglyph'>[</span><span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span>
<a name="line-69"></a> <span class='hs-varid'>thinspace</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Str</span> <span class='hs-str'>"\x2006"</span>
<a name="line-70"></a> <span class='hs-varid'>medspace</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Str</span> <span class='hs-str'>"\x2005"</span>
<a name="line-71"></a> <span class='hs-varid'>widespace</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Str</span> <span class='hs-str'>"\x2004"</span>
<a name="line-72"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EStretchy</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>x</span>
<a name="line-73"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EGrouped</span> <span class='hs-varid'>xs</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>expsToInlines</span> <span class='hs-varid'>xs</span>
<a name="line-74"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ESpace</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-str'>" "</span><span class='hs-keyglyph'>]</span> <span class='hs-comment'>-- variable widths not supported</span>
<a name="line-75"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EBinary</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span> <span class='hs-keyword'>_</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-76"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ESub</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-77"></a> <span class='hs-varid'>x'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>x</span>
<a name="line-78"></a> <span class='hs-varid'>y'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>y</span>
<a name="line-79"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x'</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Subscript</span> <span class='hs-varid'>y'</span><span class='hs-keyglyph'>]</span>
<a name="line-80"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ESuper</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-81"></a> <span class='hs-varid'>x'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>x</span>
<a name="line-82"></a> <span class='hs-varid'>y'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>y</span>
<a name="line-83"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x'</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Superscript</span> <span class='hs-varid'>y'</span><span class='hs-keyglyph'>]</span>
<a name="line-84"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ESubsup</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-keyword'>do</span>
<a name="line-85"></a> <span class='hs-varid'>x'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>x</span>
<a name="line-86"></a> <span class='hs-varid'>y'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>y</span>
<a name="line-87"></a> <span class='hs-varid'>z'</span> <span class='hs-keyglyph'><-</span> <span class='hs-varid'>expToInlines</span> <span class='hs-varid'>z</span>
<a name="line-88"></a> <span class='hs-varid'>return</span> <span class='hs-varop'>$</span> <span class='hs-varid'>x'</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Subscript</span> <span class='hs-varid'>y'</span><span class='hs-keyglyph'>]</span> <span class='hs-varop'>++</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Superscript</span> <span class='hs-varid'>z'</span><span class='hs-keyglyph'>]</span>
<a name="line-89"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EDown</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ESub</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-90"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EUp</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ESuper</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span><span class='hs-layout'>)</span>
<a name="line-91"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EDownup</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-varid'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>ESubsup</span> <span class='hs-varid'>x</span> <span class='hs-varid'>y</span> <span class='hs-varid'>z</span><span class='hs-layout'>)</span>
<a name="line-92"></a><span class='hs-definition'>expToInlines</span> <span class='hs-layout'>(</span><span class='hs-conid'>EText</span> <span class='hs-keyword'>_</span> <span class='hs-varid'>x</span><span class='hs-layout'>)</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Just</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Emph</span> <span class='hs-keyglyph'>[</span><span class='hs-conid'>Str</span> <span class='hs-varid'>x</span><span class='hs-keyglyph'>]</span><span class='hs-keyglyph'>]</span>
<a name="line-93"></a><span class='hs-definition'>expToInlines</span> <span class='hs-keyword'>_</span> <span class='hs-keyglyph'>=</span> <span class='hs-conid'>Nothing</span>
<a name="line-94"></a>
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