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"""This module defines Exporter, a highly configurable converter
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that uses Jinja2 to export notebook files into different formats.
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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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from __future__ import print_function, absolute_import
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# Stdlib imports
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import io
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import os
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import inspect
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# IPython imports
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from IPython.config.configurable import Configurable
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from IPython.nbformat import current as nbformat
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from IPython.utils.traitlets import MetaHasTraits, Unicode, List, Bool
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from IPython.utils.text import indent
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# other libs/dependencies
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from jinja2 import Environment, FileSystemLoader
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from markdown import markdown
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# local import
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import nbconvert.filters.strings
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import nbconvert.filters.markdown
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import nbconvert.filters.latex
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import nbconvert.filters.datatypefilter
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import nbconvert.filters.highlight
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import nbconvert.filters.ansi
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import nbconvert.transformers.extractfigure
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import nbconvert.transformers.coalescestreams
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#-----------------------------------------------------------------------------
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# Globals and constants
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#-----------------------------------------------------------------------------
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#Jinja2 extensions to load.
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JINJA_EXTENSIONS = ['jinja2.ext.loopcontrols']
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#-----------------------------------------------------------------------------
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# Class
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#-----------------------------------------------------------------------------
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class Exporter(Configurable):
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"""
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Exports notebooks into other file formats. Uses Jinja 2 templating engine
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to output new formats. Inherit from this class if you are creating a new
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template type along with new filters/transformers. If the filters/
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transformers provided by default suffice, there is no need to inherit from
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this class. Instead, override the template_file and file_extension
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traits via a config file.
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"""
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template_file = Unicode(
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'', config=True,
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help="Name of the template file to use")
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file_extension = Unicode(
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'txt', config=True,
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help="Extension of the file that should be written to disk"
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)
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template_path = Unicode(
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"/../templates/", config=True,
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help="Path where the template files are located.")
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template_skeleton_path = Unicode(
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"/../templates/skeleton/", config=True,
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help="Path where the template skeleton files are located.")
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#Jinja block definitions
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jinja_comment_block_start = Unicode(None, config=True)
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jinja_comment_block_end = Unicode(None, config=True)
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jinja_variable_block_start = Unicode(None, config=True)
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jinja_variable_block_end = Unicode(None, config=True)
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jinja_logic_block_start = Unicode(None, config=True)
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jinja_logic_block_end = Unicode(None, config=True)
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#Extension that the template files use.
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template_extension = Unicode(".tpl", config=True)
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#Processors that process the input data prior to the export, set in the
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#constructor for this class.
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preprocessors = []
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def __init__(self, transformers=None, filters=None, config=None, **kw):
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"""
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Public constructor
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Parameters
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----------
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transformers : list[of transformer]
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Custom transformers to apply to the notebook prior to engaging
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the Jinja template engine. Any transformers specified here
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will override existing transformers if a naming conflict
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occurs.
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filters : list[of filter]
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Custom filters to make accessible to the Jinja templates. Any
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filters specified here will override existing filters if a
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naming conflict occurs.
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config : config
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User configuration instance.
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"""
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#Call the base class constructor
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super(Exporter, self).__init__(config=config, **kw)
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#Standard environment
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self._init_environment()
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#Add transformers
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self._register_transformers()
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#Add filters to the Jinja2 environment
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self._register_filters()
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#Load user transformers. Overwrite existing transformers if need be.
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if not transformers is None:
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for transformer in transformers:
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self.register_transformer(transformer)
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#Load user filters. Overwrite existing filters if need be.
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if not filters is None:
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for key, user_filter in filters.iteritems():
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if issubclass(user_filter, MetaHasTraits):
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self.environment.filters[key] = user_filter(config=config)
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else:
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self.environment.filters[key] = user_filter
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def from_notebook_node(self, nb):
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"""
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Convert a notebook from a notebook node instance.
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Parameters
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----------
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nb : Notebook node
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"""
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nb, resources = self._preprocess(nb)
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#Load the template file.
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self.template = self.environment.get_template(self.template_file+self.template_extension)
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return self.template.render(nb=nb, resources=resources), resources
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def from_filename(self, filename):
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"""
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Convert a notebook from a notebook file.
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Parameters
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----------
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filename : str
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Full filename of the notebook file to open and convert.
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"""
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with io.open(filename) as f:
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return self.from_notebook_node(nbformat.read(f, 'json'))
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def from_file(self, file_stream):
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"""
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Convert a notebook from a notebook file.
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Parameters
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----------
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file_stream : file-like object
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Notebook file-like object to convert.
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"""
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return self.from_notebook_node(nbformat.read(file_stream, 'json'))
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def register_transformer(self, transformer):
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"""
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Register a transformer.
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Transformers are classes that act upon the notebook before it is
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passed into the Jinja templating engine. Transformers are also
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capable of passing additional information to the Jinja
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templating engine.
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Parameters
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----------
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transformer : transformer
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"""
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if inspect.isfunction(transformer):
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self.preprocessors.append(transformer)
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return transformer
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elif isinstance(transformer, MetaHasTraits):
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transformer_instance = transformer(config=self.config)
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self.preprocessors.append(transformer_instance)
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return transformer_instance
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else:
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transformer_instance = transformer()
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self.preprocessors.append(transformer_instance)
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return transformer_instance
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def register_filter(self, name, filter):
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"""
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Register a filter.
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A filter is a function that accepts and acts on one string.
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The filters are accesible within the Jinja templating engine.
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Parameters
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----------
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name : str
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name to give the filter in the Jinja engine
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filter : filter
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"""
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if inspect.isfunction(filter):
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self.environment.filters[name] = filter
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elif isinstance(filter, MetaHasTraits):
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self.environment.filters[name] = filter(config=self.config)
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else:
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self.environment.filters[name] = filter()
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return self.environment.filters[name]
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def _register_transformers(self):
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"""
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Register all of the transformers needed for this exporter.
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"""
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self.register_transformer(nbconvert.transformers.coalescestreams.coalesce_streams)
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#Remember the figure extraction transformer so it can be enabled and
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#disabled easily later.
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self.extract_figure_transformer = self.register_transformer(nbconvert.transformers.extractfigure.ExtractFigureTransformer)
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def _register_filters(self):
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"""
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Register all of the filters required for the exporter.
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"""
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self.register_filter('indent', indent)
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self.register_filter('markdown', markdown)
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self.register_filter('ansi2html', nbconvert.filters.ansi.ansi2html)
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self.register_filter('filter_data_type', nbconvert.filters.datatypefilter.DataTypeFilter)
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self.register_filter('get_lines', nbconvert.filters.strings.get_lines)
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self.register_filter('highlight', nbconvert.filters.highlight.highlight)
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self.register_filter('highlight2html', nbconvert.filters.highlight.highlight)
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self.register_filter('highlight2latex', nbconvert.filters.highlight.highlight2latex)
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self.register_filter('markdown2latex', nbconvert.filters.markdown.markdown2latex)
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self.register_filter('markdown2rst', nbconvert.filters.markdown.markdown2rst)
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self.register_filter('pycomment', nbconvert.filters.strings.python_comment)
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self.register_filter('rm_ansi', nbconvert.filters.ansi.remove_ansi)
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self.register_filter('rm_dollars', nbconvert.filters.strings.strip_dollars)
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self.register_filter('rm_fake', nbconvert.filters.strings.rm_fake)
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self.register_filter('rm_math_space', nbconvert.filters.latex.rm_math_space)
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self.register_filter('wrap', nbconvert.filters.strings.wrap)
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def _init_environment(self):
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"""
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Create the Jinja templating environment.
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"""
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self.environment = Environment(
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loader=FileSystemLoader([
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os.path.dirname(os.path.realpath(__file__)) + self.template_path,
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os.path.dirname(os.path.realpath(__file__)) + self.template_skeleton_path,
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]),
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extensions=JINJA_EXTENSIONS
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)
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#Set special Jinja2 syntax that will not conflict with latex.
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if not self.jinja_logic_block_start == None:
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self.environment.block_start_string = self.jinja_logic_block_start
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if not self.jinja_logic_block_end == None:
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self.environment.block_end_string = self.jinja_logic_block_end
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if not self.jinja_variable_block_start == None:
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self.environment.variable_start_string = self.jinja_variable_block_start
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if not self.jinja_variable_block_end == None:
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self.environment.variable_end_string = self.jinja_variable_block_end
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if not self.jinja_comment_block_start == None:
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self.environment.comment_start_string = self.jinja_comment_block_start
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if not self.jinja_comment_block_end == None:
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self.environment.comment_end_string = self.jinja_comment_block_end
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def _preprocess(self, nb):
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"""
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Preprocess the notebook before passing it into the Jinja engine.
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To preprocess the notebook is to apply all of the
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Parameters
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----------
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nb : notebook node
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notebook that is being exported.
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"""
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#Dict of 'resources' that can be filled by the preprocessors.
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resources = {}
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#Run each transformer on the notebook. Carry the output along
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#to each transformer
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for transformer in self.preprocessors:
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nb, resources = transformer(nb, resources)
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return nb, resources
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