##// END OF EJS Templates
add markdown2html filter...
add markdown2html filter uses pandoc instead of Python markdown for better consistency. Also eliminates one dependency.

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exporter.py
337 lines | 11.5 KiB | text/x-python | PythonLexer
"""This module defines Exporter, a highly configurable converter
that uses Jinja2 to export notebook files into different formats.
"""
#-----------------------------------------------------------------------------
# Copyright (c) 2013, the IPython Development Team.
#
# Distributed under the terms of the Modified BSD License.
#
# The full license is in the file COPYING.txt, distributed with this software.
#-----------------------------------------------------------------------------
#-----------------------------------------------------------------------------
# Imports
#-----------------------------------------------------------------------------
from __future__ import print_function, absolute_import
# Stdlib imports
import io
import os
import inspect
from copy import deepcopy
# other libs/dependencies
from jinja2 import Environment, FileSystemLoader
# IPython imports
from IPython.config.configurable import Configurable
from IPython.config import Config
from IPython.nbformat import current as nbformat
from IPython.utils.traitlets import MetaHasTraits, Unicode
from IPython.utils.text import indent
from IPython.nbconvert import filters
from IPython.nbconvert import transformers
#-----------------------------------------------------------------------------
# Globals and constants
#-----------------------------------------------------------------------------
#Jinja2 extensions to load.
JINJA_EXTENSIONS = ['jinja2.ext.loopcontrols']
default_filters = {
'indent': indent,
'markdown': filters.markdown2html,
'ansi2html': filters.ansi2html,
'filter_data_type': filters.DataTypeFilter,
'get_lines': filters.get_lines,
'highlight': filters.highlight,
'highlight2html': filters.highlight,
'highlight2latex': filters.highlight2latex,
'markdown2latex': filters.markdown2latex,
'markdown2rst': filters.markdown2rst,
'pycomment': filters.python_comment,
'rm_ansi': filters.remove_ansi,
'rm_dollars': filters.strip_dollars,
'rm_fake': filters.rm_fake,
'ansi2latex': filters.ansi2latex,
'rm_math_space': filters.rm_math_space,
'wrap': filters.wrap
}
#-----------------------------------------------------------------------------
# Class
#-----------------------------------------------------------------------------
class Exporter(Configurable):
"""
Exports notebooks into other file formats. Uses Jinja 2 templating engine
to output new formats. Inherit from this class if you are creating a new
template type along with new filters/transformers. If the filters/
transformers provided by default suffice, there is no need to inherit from
this class. Instead, override the template_file and file_extension
traits via a config file.
{filters}
"""
# finish the docstring
__doc__ = __doc__.format(filters = '- '+'\n - '.join(default_filters.keys()))
template_file = Unicode(
'', config=True,
help="Name of the template file to use")
file_extension = Unicode(
'txt', config=True,
help="Extension of the file that should be written to disk"
)
template_path = Unicode(
os.path.join("..", "templates"), config=True,
help="Path where the template files are located.")
template_skeleton_path = Unicode(
os.path.join("..", "templates", "skeleton"), config=True,
help="Path where the template skeleton files are located.")
#Jinja block definitions
jinja_comment_block_start = Unicode("", config=True)
jinja_comment_block_end = Unicode("", config=True)
jinja_variable_block_start = Unicode("", config=True)
jinja_variable_block_end = Unicode("", config=True)
jinja_logic_block_start = Unicode("", config=True)
jinja_logic_block_end = Unicode("", config=True)
#Extension that the template files use.
template_extension = Unicode(".tpl", config=True)
#Processors that process the input data prior to the export, set in the
#constructor for this class.
transformers = None
def __init__(self, transformers=None, filters=None, config=None, **kw):
"""
Public constructor
Parameters
----------
transformers : list[of transformer]
Custom transformers to apply to the notebook prior to engaging
the Jinja template engine. Any transformers specified here
will override existing transformers if a naming conflict
occurs.
filters : dict[of filter]
filters specified here will override existing filters if a naming
conflict occurs. Filters are availlable in jinja template through
the name of the corresponding key. Cf class docstring for
availlable default filters.
config : config
User configuration instance.
"""
#Call the base class constructor
c = self.default_config
if config:
c.merge(config)
super(Exporter, self).__init__(config=c, **kw)
#Standard environment
self._init_environment()
#Add transformers
self._register_transformers()
#Add filters to the Jinja2 environment
self._register_filters()
#Load user transformers. Overwrite existing transformers if need be.
if transformers :
for transformer in transformers:
self.register_transformer(transformer)
#Load user filters. Overwrite existing filters if need be.
if not filters is None:
for key, user_filter in filters.iteritems():
self.register_filter(key, user_filter)
@property
def default_config(self):
return Config()
def from_notebook_node(self, nb, resources=None):
"""
Convert a notebook from a notebook node instance.
Parameters
----------
nb : Notebook node
resources : a dict of additional resources that
can be accessed read/write by transformers
and filters.
"""
if resources is None:
resources = {}
nb, resources = self._preprocess(nb, resources)
#Load the template file.
self.template = self.environment.get_template(self.template_file+self.template_extension)
return self.template.render(nb=nb, resources=resources), resources
def from_filename(self, filename):
"""
Convert a notebook from a notebook file.
Parameters
----------
filename : str
Full filename of the notebook file to open and convert.
"""
with io.open(filename) as f:
return self.from_notebook_node(nbformat.read(f, 'json'))
def from_file(self, file_stream):
"""
Convert a notebook from a notebook file.
Parameters
----------
file_stream : file-like object
Notebook file-like object to convert.
"""
return self.from_notebook_node(nbformat.read(file_stream, 'json'))
def register_transformer(self, transformer):
"""
Register a transformer.
Transformers are classes that act upon the notebook before it is
passed into the Jinja templating engine. Transformers are also
capable of passing additional information to the Jinja
templating engine.
Parameters
----------
transformer : transformer
"""
if self.transformers is None:
self.transformers = []
if inspect.isfunction(transformer):
self.transformers.append(transformer)
return transformer
elif isinstance(transformer, MetaHasTraits):
transformer_instance = transformer(config=self.config)
self.transformers.append(transformer_instance)
return transformer_instance
else:
transformer_instance = transformer()
self.transformers.append(transformer_instance)
return transformer_instance
def register_filter(self, name, filter):
"""
Register a filter.
A filter is a function that accepts and acts on one string.
The filters are accesible within the Jinja templating engine.
Parameters
----------
name : str
name to give the filter in the Jinja engine
filter : filter
"""
if inspect.isfunction(filter):
self.environment.filters[name] = filter
elif isinstance(filter, MetaHasTraits):
self.environment.filters[name] = filter(config=self.config)
else:
self.environment.filters[name] = filter()
return self.environment.filters[name]
def _register_transformers(self):
"""
Register all of the transformers needed for this exporter.
"""
self.register_transformer(transformers.coalesce_streams)
#Remember the figure extraction transformer so it can be enabled and
#disabled easily later.
self.extract_figure_transformer = self.register_transformer(transformers.ExtractFigureTransformer)
def _register_filters(self):
"""
Register all of the filters required for the exporter.
"""
for k, v in default_filters.iteritems():
self.register_filter(k, v)
def _init_environment(self):
"""
Create the Jinja templating environment.
"""
here = os.path.dirname(os.path.realpath(__file__))
self.environment = Environment(
loader=FileSystemLoader([
os.path.join(here, self.template_path),
os.path.join(here, self.template_skeleton_path),
]),
extensions=JINJA_EXTENSIONS
)
#Set special Jinja2 syntax that will not conflict with latex.
if self.jinja_logic_block_start:
self.environment.block_start_string = self.jinja_logic_block_start
if self.jinja_logic_block_end:
self.environment.block_end_string = self.jinja_logic_block_end
if self.jinja_variable_block_start:
self.environment.variable_start_string = self.jinja_variable_block_start
if self.jinja_variable_block_end:
self.environment.variable_end_string = self.jinja_variable_block_end
if self.jinja_comment_block_start:
self.environment.comment_start_string = self.jinja_comment_block_start
if self.jinja_comment_block_end:
self.environment.comment_end_string = self.jinja_comment_block_end
def _preprocess(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 deepcopy first,
# we are never safe enough with what the transformers could do.
nbc = deepcopy(nb)
resc = deepcopy(resources)
#Run each transformer on the notebook. Carry the output along
#to each transformer
for transformer in self.transformers:
nb, resources = transformer(nbc, resc)
return nb, resources