|
|
"""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
|
|
|
from markdown import markdown
|
|
|
|
|
|
# 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': markdown,
|
|
|
'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
|
|
|
|
|
|
|
