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"""
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Module containing filter functions that allow code to be highlighted
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from within Jinja templates.
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"""
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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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# Imports
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#-----------------------------------------------------------------------------
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import re
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from pygments import highlight as pygements_highlight
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from pygments.lexers import get_lexer_by_name
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from pygments.formatters import HtmlFormatter
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from pygments.formatters import LatexFormatter
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# Our own imports
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from IPython.nbconvert.utils.lexers import IPythonLexer
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#-----------------------------------------------------------------------------
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# Globals and constants
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#-----------------------------------------------------------------------------
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MULTILINE_OUTPUTS = ['text', 'html', 'svg', 'latex', 'javascript', 'json']
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#-----------------------------------------------------------------------------
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# Utility functions
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#-----------------------------------------------------------------------------
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__all__ = [
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'highlight2html',
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'highlight2latex'
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]
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def highlight2html(cell, language='ipython'):
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"""
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Return a syntax-highlighted version of the input source as html output.
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Parameters
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----------
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cell : NotebookNode cell
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cell to highlight
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language : str
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Language to highlight the syntax of.
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"""
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return _pygment_highlight(cell, HtmlFormatter(), language)
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def highlight2latex(cell, language='ipython'):
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"""
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Return a syntax-highlighted version of the input source as latex output.
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Parameters
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----------
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cell : NotebookNode cell
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cell to highlight
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language : str
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Language to highlight the syntax of.
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"""
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return _pygment_highlight(cell, LatexFormatter(), language)
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def _pygment_highlight(cell, output_formatter, language='ipython'):
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"""
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Return a syntax-highlighted version of the input source
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Parameters
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----------
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cell : NotebookNode cell
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cell to highlight
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output_formatter : Pygments formatter
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language : str
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Language to highlight the syntax of.
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"""
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# If the cell uses a magic extension language,
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# use the magic language instead.
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if language == 'ipython' \
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and 'metadata' in cell \
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and 'magics_language' in cell['metadata']:
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language = cell['metadata']['magics_language']
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if language == 'ipython':
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lexer = IPythonLexer()
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else:
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lexer = get_lexer_by_name(language, stripall=True)
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return pygements_highlight(cell, lexer, output_formatter)
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