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# :Id: $Id: tex2mathml_extern.py 9250 2022-11-16 14:01:31Z milde $
# :Copyright: © 2015 Günter Milde.
# :License: Released under the terms of the `2-Clause BSD license`_, in short:
#
# Copying and distribution of this file, with or without modification,
# are permitted in any medium without royalty provided the copyright
# notice and this notice are preserved.
# This file is offered as-is, without any warranty.
#
# .. _2-Clause BSD license: https://opensource.org/licenses/BSD-2-Clause
"""Wrappers for TeX->MathML conversion by external tools
This module is provisional:
the API is not settled and may change with any minor Docutils version.
"""
import subprocess
document_template = r"""\documentclass{article}
\usepackage{amsmath}
\begin{document}
%s
\end{document}
"""
def latexml(math_code, reporter=None):
"""Convert LaTeX math code to MathML with LaTeXML_
.. _LaTeXML: http://dlmf.nist.gov/LaTeXML/
"""
p = subprocess.Popen(['latexml',
'-', # read from stdin
'--preload=amsfonts',
'--preload=amsmath',
'--inputencoding=utf8',
],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
close_fds=True)
p.stdin.write((document_template % math_code).encode('utf-8'))
p.stdin.close()
latexml_code = p.stdout.read()
latexml_err = p.stderr.read().decode('utf-8')
if reporter and (latexml_err.find('Error') >= 0 or not latexml_code):
reporter.error(latexml_err)
post_p = subprocess.Popen(['latexmlpost',
'-',
'--nonumbersections',
'--format=xhtml',
# '--linelength=78', # experimental
'--'
],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
close_fds=True)
post_p.stdin.write(latexml_code)
post_p.stdin.close()
result = post_p.stdout.read().decode('utf-8')
post_p_err = post_p.stderr.read().decode('utf-8')
if reporter and (post_p_err.find('Error') >= 0 or not result):
reporter.error(post_p_err)
# extract MathML code:
start, end = result.find('<math'), result.find('</math>')+7
result = result[start:end]
if 'class="ltx_ERROR' in result:
raise SyntaxError(result)
return result
def ttm(math_code, reporter=None):
"""Convert LaTeX math code to MathML with TtM_
.. _TtM: http://hutchinson.belmont.ma.us/tth/mml/
"""
p = subprocess.Popen(['ttm',
# '-i', # italic font for equations. Default roman.
'-u', # unicode encoding. (Default iso-8859-1).
'-r', # output raw MathML (no wrapper)
],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
close_fds=True)
p.stdin.write((document_template % math_code).encode('utf-8'))
p.stdin.close()
result = p.stdout.read()
err = p.stderr.read().decode('utf-8')
if err.find('**** Unknown') >= 0:
msg = '\n'.join(line for line in err.splitlines()
if line.startswith('****'))
raise SyntaxError('\nMessage from external converter TtM:\n'+msg)
if reporter and err.find('**** Error') >= 0 or not result:
reporter.error(err)
start, end = result.find('<math'), result.find('</math>')+7
return result[start:end]
def blahtexml(math_code, inline=True, reporter=None):
"""Convert LaTeX math code to MathML with blahtexml_
.. _blahtexml: http://gva.noekeon.org/blahtexml/
"""
options = ['--mathml',
'--indented',
'--spacing', 'moderate',
'--mathml-encoding', 'raw',
'--other-encoding', 'raw',
'--doctype-xhtml+mathml',
'--annotate-TeX',
]
if inline:
mathmode_arg = ''
else:
mathmode_arg = ' display="block"'
options.append('--displaymath')
p = subprocess.Popen(['blahtexml']+options,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
close_fds=True)
p.stdin.write(math_code.encode('utf-8'))
p.stdin.close()
result = p.stdout.read().decode('utf-8')
err = p.stderr.read().decode('utf-8')
if result.find('<error>') >= 0:
msg = result[result.find('<message>')+9:result.find('</message>')]
raise SyntaxError('\nMessage from external converter blahtexml:\n%s'
% msg)
if reporter and (err.find('**** Error') >= 0 or not result):
reporter.error(err)
start, end = result.find('<markup>')+9, result.find('</markup>')
result = ('<math xmlns="http://www.w3.org/1998/Math/MathML"%s>\n'
'%s</math>\n') % (mathmode_arg, result[start:end])
return result
def pandoc(math_code, reporter=None):
"""Convert LaTeX math code to MathML with pandoc_
.. _pandoc: https://pandoc.org/
"""
p = subprocess.Popen(['pandoc',
'--mathml',
'--from=latex',
],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE,
close_fds=True)
p.stdin.write(math_code.encode('utf-8'))
p.stdin.close()
result = p.stdout.read().decode('utf-8')
err = p.stderr.read().decode('utf-8').strip()
x = p.wait()
if err:
if reporter:
reporter.error(err)
raise SyntaxError('\nError message from external converter pandoc:\n%s'
% err)
if x != 0:
raise SyntaxError('\nError code from external converter pandoc:\n%s'
% x)
start, end = result.find('<math'), result.find('</math>')+7
return result[start:end]
# self-test
if __name__ == "__main__":
example = ('\\frac{\\partial \\sin^2(\\alpha)}{\\partial \\vec r}'
'\\varpi \\mathbb{R} \\, \\text{Grüße}')
# print(latexml('$'+example+'$'))
# print(ttm('$'+example.replace('\\mathbb{R}', '')+'$'))
print(blahtexml(example))
# print(pandoc('$'+example+'$'))