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"""Citation handling for LaTeX output."""
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#-----------------------------------------------------------------------------
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# Copyright (c) 2013, the IPython Development Team.
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#
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# Distributed under the terms of the Modified BSD License.
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#
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# The full license is in the file COPYING.txt, distributed with this software.
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#-----------------------------------------------------------------------------
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#-----------------------------------------------------------------------------
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# Code
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#-----------------------------------------------------------------------------
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__all__ = ['citation2latex']
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def citation2latex(s):
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"""Parse citations in Markdown cells.
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This looks for HTML tags having a data attribute names `data-cite`
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and replaces it by the call to LaTeX cite command. The tranformation
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looks like this:
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`<cite data-cite="granger">(Granger, 2013)</cite>`
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Becomes
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`\\cite{granger}`
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Any HTML tag can be used, which allows the citations to be formatted
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in HTML in any manner.
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"""
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try:
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from lxml import html
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except ImportError:
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return s
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tree = html.fragment_fromstring(s, create_parent='div')
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_process_node_cite(tree)
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s = html.tostring(tree)
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if s.endswith('</div>'):
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s = s[:-6]
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if s.startswith('<div>'):
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s = s[5:]
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return s
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def _process_node_cite(node):
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"""Do the citation replacement as we walk the lxml tree."""
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def _get(o, name):
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value = getattr(o, name, None)
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return '' if value is None else value
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if 'data-cite' in node.attrib:
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cite = '\cite{%(ref)s}' % {'ref': node.attrib['data-cite']}
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prev = node.getprevious()
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if prev is not None:
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prev.tail = _get(prev, 'tail') + cite + _get(node, 'tail')
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else:
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parent = node.getparent()
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if parent is not None:
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parent.text = _get(parent, 'text') + cite + _get(node, 'tail')
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try:
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node.getparent().remove(node)
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except AttributeError:
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pass
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else:
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for child in node:
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_process_node_cite(child)
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