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# -*- coding: utf-8 -*-
"""
sphinx.ext.mathbase
~~~~~~~~~~~~~~~~~~~
Set up math support in source files and LaTeX/text output.
:copyright: Copyright 2007-2010 by the Sphinx team, see AUTHORS.
:license: BSD, see LICENSE for details.
"""
from docutils import nodes, utils
from docutils.parsers.rst import directives
from sphinx.util.compat import Directive
class math(nodes.Inline, nodes.TextElement):
pass
class displaymath(nodes.Part, nodes.Element):
pass
class eqref(nodes.Inline, nodes.TextElement):
pass
def wrap_displaymath(math, label):
parts = math.split('\n\n')
ret = []
for i, part in enumerate(parts):
if label is not None and i == 0:
ret.append('\\begin{split}%s\\end{split}' % part +
(label and '\\label{'+label+'}' or ''))
else:
ret.append('\\begin{split}%s\\end{split}\\notag' % part)
return '\\begin{gather}\n' + '\\\\'.join(ret) + '\n\\end{gather}'
def math_role(role, rawtext, text, lineno, inliner, options={}, content=[]):
latex = utils.unescape(text, restore_backslashes=True)
return [math(latex=latex)], []
def eq_role(role, rawtext, text, lineno, inliner, options={}, content=[]):
text = utils.unescape(text)
node = eqref('(?)', '(?)', target=text)
node['docname'] = inliner.document.settings.env.docname
return [node], []
class MathDirective(Directive):
has_content = True
required_arguments = 0
optional_arguments = 1
final_argument_whitespace = True
option_spec = {
'label': directives.unchanged,
'nowrap': directives.flag,
}
def run(self):
latex = '\n'.join(self.content)
if self.arguments and self.arguments[0]:
latex = self.arguments[0] + '\n\n' + latex
node = displaymath()
node['latex'] = latex
node['label'] = self.options.get('label', None)
node['nowrap'] = 'nowrap' in self.options
node['docname'] = self.state.document.settings.env.docname
ret = [node]
if node['label']:
tnode = nodes.target('', '', ids=['equation-' + node['label']])
self.state.document.note_explicit_target(tnode)
ret.insert(0, tnode)
return ret
def latex_visit_math(self, node):
self.body.append('$' + node['latex'] + '$')
raise nodes.SkipNode
def latex_visit_displaymath(self, node):
if node['nowrap']:
self.body.append(node['latex'])
else:
label = node['label'] and node['docname'] + '-' + node['label'] or None
self.body.append(wrap_displaymath(node['latex'], label))
raise nodes.SkipNode
def latex_visit_eqref(self, node):
self.body.append('\\eqref{%s-%s}' % (node['docname'], node['target']))
raise nodes.SkipNode
def text_visit_math(self, node):
self.add_text(node['latex'])
raise nodes.SkipNode
def text_visit_displaymath(self, node):
self.new_state()
self.add_text(node['latex'])
self.end_state()
raise nodes.SkipNode
def text_visit_eqref(self, node):
self.add_text(node['target'])
raise nodes.SkipNode
def html_visit_eqref(self, node):
self.body.append('<a href="#equation-%s">' % node['target'])
def html_depart_eqref(self, node):
self.body.append('</a>')
def number_equations(app, doctree, docname):
num = 0
numbers = {}
for node in doctree.traverse(displaymath):
if node['label'] is not None:
num += 1
node['number'] = num
numbers[node['label']] = num
else:
node['number'] = None
for node in doctree.traverse(eqref):
if node['target'] not in numbers:
continue
num = '(%d)' % numbers[node['target']]
node[0] = nodes.Text(num, num)
def setup_math(app, htmlinlinevisitors, htmldisplayvisitors):
app.add_node(math,
latex=(latex_visit_math, None),
text=(text_visit_math, None),
html=htmlinlinevisitors)
app.add_node(displaymath,
latex=(latex_visit_displaymath, None),
text=(text_visit_displaymath, None),
html=htmldisplayvisitors)
app.add_node(eqref,
latex=(latex_visit_eqref, None),
text=(text_visit_eqref, None),
html=(html_visit_eqref, html_depart_eqref))
app.add_role('math', math_role)
app.add_role('eq', eq_role)
app.add_directive('math', MathDirective)
app.connect('doctree-resolved', number_equations)
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