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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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import copy
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import collections
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import datetime
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# other libs/dependencies
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from jinja2 import Environment, FileSystemLoader, ChoiceLoader, TemplateNotFound
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# IPython imports
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from IPython.config.configurable import LoggingConfigurable
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from IPython.config import Config
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from IPython.nbformat import current as nbformat
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from IPython.utils.traitlets import MetaHasTraits, DottedObjectName, Unicode, List, Dict, Any
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from IPython.utils.importstring import import_item
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from IPython.utils.text import indent
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from IPython.utils import py3compat
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from IPython.nbconvert import transformers as nbtransformers
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from IPython.nbconvert import filters
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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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default_filters = {
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'indent': indent,
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'markdown2html': filters.markdown2html,
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'ansi2html': filters.ansi2html,
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'filter_data_type': filters.DataTypeFilter,
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'get_lines': filters.get_lines,
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'highlight2html': filters.highlight2html,
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'highlight2latex': filters.highlight2latex,
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'ipython2python': filters.ipython2python,
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'posix_path': filters.posix_path,
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'markdown2latex': filters.markdown2latex,
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'markdown2rst': filters.markdown2rst,
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'comment_lines': filters.comment_lines,
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'strip_ansi': filters.strip_ansi,
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'strip_dollars': filters.strip_dollars,
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'strip_files_prefix': filters.strip_files_prefix,
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'html2text' : filters.html2text,
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'add_anchor': filters.add_anchor,
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'ansi2latex': filters.ansi2latex,
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'strip_math_space': filters.strip_math_space,
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'wrap_text': filters.wrap_text,
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'escape_latex': filters.escape_latex,
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}
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#-----------------------------------------------------------------------------
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# Class
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#-----------------------------------------------------------------------------
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class ResourcesDict(collections.defaultdict):
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def __missing__(self, key):
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return ''
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class Exporter(LoggingConfigurable):
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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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{filters}
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"""
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# finish the docstring
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__doc__ = __doc__.format(filters = '- '+'\n - '.join(default_filters.keys()))
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template_file = Unicode(u'default',
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config=True,
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help="Name of the template file to use")
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def _template_file_changed(self, name, old, new):
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if new=='default':
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self.template_file = self.default_template
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else:
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self.template_file = new
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self.template = None
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self._load_template()
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default_template = Unicode(u'')
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template = Any()
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environment = Any()
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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 = List(['.'], config=True)
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def _template_path_changed(self, name, old, new):
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self._load_template()
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default_template_path = Unicode(
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os.path.join("..", "templates"),
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help="Path where the template files are located.")
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template_skeleton_path = Unicode(
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os.path.join("..", "templates", "skeleton"),
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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("", config=True)
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jinja_comment_block_end = Unicode("", config=True)
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jinja_variable_block_start = Unicode("", config=True)
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jinja_variable_block_end = Unicode("", config=True)
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jinja_logic_block_start = Unicode("", config=True)
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jinja_logic_block_end = Unicode("", 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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#Configurability, allows the user to easily add filters and transformers.
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transformers = List(config=True,
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help="""List of transformers, by name or namespace, to enable.""")
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filters = Dict(config=True,
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help="""Dictionary of filters, by name and namespace, to add to the Jinja
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environment.""")
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default_transformers = List([nbtransformers.coalesce_streams,
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nbtransformers.SVG2PDFTransformer,
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nbtransformers.ExtractOutputTransformer,
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nbtransformers.CSSHTMLHeaderTransformer,
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nbtransformers.RevealHelpTransformer,
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nbtransformers.LatexTransformer,
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nbtransformers.SphinxTransformer],
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config=True,
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help="""List of transformers available by default, by name, namespace,
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instance, or type.""")
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def __init__(self, config=None, extra_loaders=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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config : config
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User configuration instance.
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extra_loaders : list[of Jinja Loaders]
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ordered list of Jinja loader to find templates. Will be tried in order
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before the default FileSystem ones.
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template : str (optional, kw arg)
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Template to use when exporting.
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"""
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if not config:
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config = self.default_config
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super(Exporter, self).__init__(config=config, **kw)
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#Init
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self._init_template()
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self._init_environment(extra_loaders=extra_loaders)
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self._init_transformers()
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self._init_filters()
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@property
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def default_config(self):
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return Config()
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def _config_changed(self, name, old, new):
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"""When setting config, make sure to start with our default_config"""
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c = self.default_config
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if new:
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c.merge(new)
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if c != old:
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self.config = c
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super(Exporter, self)._config_changed(name, old, c)
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def _load_template(self):
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"""Load the Jinja template object from the template file
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This is a no-op if the template attribute is already defined,
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or the Jinja environment is not setup yet.
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This is triggered by various trait changes that would change the template.
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"""
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if self.template is not None:
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return
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# called too early, do nothing
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if self.environment is None:
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return
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# Try different template names during conversion. First try to load the
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# template by name with extension added, then try loading the template
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# as if the name is explicitly specified, then try the name as a
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# 'flavor', and lastly just try to load the template by module name.
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module_name = self.__module__.rsplit('.', 1)[-1]
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try_names = []
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if self.template_file:
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try_names.extend([
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self.template_file + self.template_extension,
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self.template_file,
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module_name + '_' + self.template_file + self.template_extension,
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])
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try_names.append(module_name + self.template_extension)
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for try_name in try_names:
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self.log.debug("Attempting to load template %s", try_name)
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try:
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self.template = self.environment.get_template(try_name)
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except (TemplateNotFound, IOError):
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pass
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except Exception as e:
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self.log.warn("Unexpected exception loading template: %s", try_name, exc_info=True)
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else:
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self.log.info("Loaded template %s", try_name)
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break
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def from_notebook_node(self, nb, resources=None, **kw):
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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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resources : dict (**kw)
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of additional resources that can be accessed read/write by
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transformers and filters.
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"""
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nb_copy = copy.deepcopy(nb)
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resources = self._init_resources(resources)
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# Preprocess
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nb_copy, resources = self._transform(nb_copy, resources)
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self._load_template()
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if self.template is not None:
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output = self.template.render(nb=nb_copy, resources=resources)
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else:
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raise IOError('template file "%s" could not be found' % self.template_file)
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return output, resources
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def from_filename(self, filename, resources=None, **kw):
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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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#Pull the metadata from the filesystem.
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if resources is None:
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resources = ResourcesDict()
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if not 'metadata' in resources or resources['metadata'] == '':
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resources['metadata'] = ResourcesDict()
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basename = os.path.basename(filename)
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notebook_name = basename[:basename.rfind('.')]
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resources['metadata']['name'] = notebook_name
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modified_date = datetime.datetime.fromtimestamp(os.path.getmtime(filename))
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resources['metadata']['modified_date'] = modified_date.strftime("%B %d, %Y")
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with io.open(filename) as f:
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return self.from_notebook_node(nbformat.read(f, 'json'), resources=resources,**kw)
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def from_file(self, file_stream, resources=None, **kw):
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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'), resources=resources, **kw)
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def register_transformer(self, transformer, enabled=False):
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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 transformer is None:
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raise TypeError('transformer')
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isclass = isinstance(transformer, type)
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constructed = not isclass
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#Handle transformer's registration based on it's type
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if constructed and isinstance(transformer, py3compat.string_types):
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#Transformer is a string, import the namespace and recursively call
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#this register_transformer method
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transformer_cls = import_item(transformer)
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return self.register_transformer(transformer_cls, enabled)
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if constructed and hasattr(transformer, '__call__'):
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#Transformer is a function, no need to construct it.
|
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#Register and return the transformer.
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if enabled:
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transformer.enabled = True
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self._transformers.append(transformer)
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return transformer
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elif isclass and isinstance(transformer, MetaHasTraits):
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#Transformer is configurable. Make sure to pass in new default for
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#the enabled flag if one was specified.
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self.register_transformer(transformer(parent=self), enabled)
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elif isclass:
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#Transformer is not configurable, construct it
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self.register_transformer(transformer(), enabled)
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else:
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#Transformer is an instance of something without a __call__
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#attribute.
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raise TypeError('transformer')
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def register_filter(self, name, jinja_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 jinja_filter is None:
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raise TypeError('filter')
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isclass = isinstance(jinja_filter, type)
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constructed = not isclass
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#Handle filter's registration based on it's type
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if constructed and isinstance(jinja_filter, py3compat.string_types):
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#filter is a string, import the namespace and recursively call
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#this register_filter method
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filter_cls = import_item(jinja_filter)
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return self.register_filter(name, filter_cls)
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if constructed and hasattr(jinja_filter, '__call__'):
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#filter is a function, no need to construct it.
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self.environment.filters[name] = jinja_filter
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return jinja_filter
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|
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elif isclass and isinstance(jinja_filter, MetaHasTraits):
|
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|
#filter is configurable. Make sure to pass in new default for
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#the enabled flag if one was specified.
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filter_instance = jinja_filter(parent=self)
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self.register_filter(name, filter_instance )
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|
|
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elif isclass:
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|
#filter is not configurable, construct it
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filter_instance = jinja_filter()
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self.register_filter(name, filter_instance)
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else:
|
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|
#filter is an instance of something without a __call__
|
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|
#attribute.
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raise TypeError('filter')
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|
|
|
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|
|
def _init_template(self):
|
|
|
"""
|
|
|
Make sure a template name is specified. If one isn't specified, try to
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|
build one from the information we know.
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|
"""
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|
|
self._template_file_changed('template_file', self.template_file, self.template_file)
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|
|
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|
|
def _init_environment(self, extra_loaders=None):
|
|
|
"""
|
|
|
Create the Jinja templating environment.
|
|
|
"""
|
|
|
here = os.path.dirname(os.path.realpath(__file__))
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|
|
loaders = []
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|
|
if extra_loaders:
|
|
|
loaders.extend(extra_loaders)
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|
|
|
paths = self.template_path
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|
|
paths.extend([os.path.join(here, self.default_template_path),
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|
|
os.path.join(here, self.template_skeleton_path)])
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|
|
loaders.append(FileSystemLoader(paths))
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|
|
|
self.environment = Environment(
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|
|
loader= ChoiceLoader(loaders),
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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 self.jinja_logic_block_start:
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|
self.environment.block_start_string = self.jinja_logic_block_start
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|
|
if self.jinja_logic_block_end:
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|
self.environment.block_end_string = self.jinja_logic_block_end
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|
|
if self.jinja_variable_block_start:
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|
self.environment.variable_start_string = self.jinja_variable_block_start
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|
|
if self.jinja_variable_block_end:
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|
|
self.environment.variable_end_string = self.jinja_variable_block_end
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|
|
if self.jinja_comment_block_start:
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|
|
self.environment.comment_start_string = self.jinja_comment_block_start
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|
|
if self.jinja_comment_block_end:
|
|
|
self.environment.comment_end_string = self.jinja_comment_block_end
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|
|
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|
|
def _init_transformers(self):
|
|
|
"""
|
|
|
Register all of the transformers needed for this exporter, disabled
|
|
|
unless specified explicitly.
|
|
|
"""
|
|
|
self._transformers = []
|
|
|
|
|
|
#Load default transformers (not necessarly enabled by default).
|
|
|
if self.default_transformers:
|
|
|
for transformer in self.default_transformers:
|
|
|
self.register_transformer(transformer)
|
|
|
|
|
|
#Load user transformers. Enable by default.
|
|
|
if self.transformers:
|
|
|
for transformer in self.transformers:
|
|
|
self.register_transformer(transformer, enabled=True)
|
|
|
|
|
|
|
|
|
def _init_filters(self):
|
|
|
"""
|
|
|
Register all of the filters required for the exporter.
|
|
|
"""
|
|
|
|
|
|
#Add default filters to the Jinja2 environment
|
|
|
for key, value in default_filters.items():
|
|
|
self.register_filter(key, value)
|
|
|
|
|
|
#Load user filters. Overwrite existing filters if need be.
|
|
|
if self.filters:
|
|
|
for key, user_filter in self.filters.items():
|
|
|
self.register_filter(key, user_filter)
|
|
|
|
|
|
|
|
|
def _init_resources(self, resources):
|
|
|
|
|
|
#Make sure the resources dict is of ResourcesDict type.
|
|
|
if resources is None:
|
|
|
resources = ResourcesDict()
|
|
|
if not isinstance(resources, ResourcesDict):
|
|
|
new_resources = ResourcesDict()
|
|
|
new_resources.update(resources)
|
|
|
resources = new_resources
|
|
|
|
|
|
#Make sure the metadata extension exists in resources
|
|
|
if 'metadata' in resources:
|
|
|
if not isinstance(resources['metadata'], ResourcesDict):
|
|
|
resources['metadata'] = ResourcesDict(resources['metadata'])
|
|
|
else:
|
|
|
resources['metadata'] = ResourcesDict()
|
|
|
if not resources['metadata']['name']:
|
|
|
resources['metadata']['name'] = 'Notebook'
|
|
|
|
|
|
#Set the output extension
|
|
|
resources['output_extension'] = self.file_extension
|
|
|
return resources
|
|
|
|
|
|
|
|
|
def _transform(self, nb, resources):
|
|
|
"""
|
|
|
Preprocess the notebook before passing it into the Jinja engine.
|
|
|
To preprocess the notebook is to apply all of the
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
nb : notebook node
|
|
|
notebook that is being exported.
|
|
|
resources : a dict of additional resources that
|
|
|
can be accessed read/write by transformers
|
|
|
and filters.
|
|
|
"""
|
|
|
|
|
|
# Do a copy.deepcopy first,
|
|
|
# we are never safe enough with what the transformers could do.
|
|
|
nbc = copy.deepcopy(nb)
|
|
|
resc = copy.deepcopy(resources)
|
|
|
|
|
|
#Run each transformer on the notebook. Carry the output along
|
|
|
#to each transformer
|
|
|
for transformer in self._transformers:
|
|
|
nbc, resc = transformer(nbc, resc)
|
|
|
return nbc, resc
|
|
|
|
