|
|
"""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
|
|
|
import copy
|
|
|
import collections
|
|
|
import datetime
|
|
|
|
|
|
# other libs/dependencies
|
|
|
from jinja2 import Environment, FileSystemLoader, ChoiceLoader, TemplateNotFound
|
|
|
|
|
|
# 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, DottedObjectName, Unicode, List, Dict
|
|
|
from IPython.utils.importstring import import_item
|
|
|
from IPython.utils.text import indent
|
|
|
from IPython.utils import py3compat
|
|
|
|
|
|
from IPython.nbconvert import transformers as nbtransformers
|
|
|
from IPython.nbconvert import filters
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Globals and constants
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
#Jinja2 extensions to load.
|
|
|
JINJA_EXTENSIONS = ['jinja2.ext.loopcontrols']
|
|
|
|
|
|
default_filters = {
|
|
|
'indent': indent,
|
|
|
'markdown2html': filters.markdown2html,
|
|
|
'ansi2html': filters.ansi2html,
|
|
|
'filter_data_type': filters.DataTypeFilter,
|
|
|
'get_lines': filters.get_lines,
|
|
|
'highlight2html': filters.highlight2html,
|
|
|
'highlight2latex': filters.highlight2latex,
|
|
|
'ipython2python': filters.ipython2python,
|
|
|
'markdown2latex': filters.markdown2latex,
|
|
|
'markdown2rst': filters.markdown2rst,
|
|
|
'comment_lines': filters.comment_lines,
|
|
|
'strip_ansi': filters.strip_ansi,
|
|
|
'strip_dollars': filters.strip_dollars,
|
|
|
'strip_files_prefix': filters.strip_files_prefix,
|
|
|
'html2text' : filters.html2text,
|
|
|
'add_anchor': filters.add_anchor,
|
|
|
'ansi2latex': filters.ansi2latex,
|
|
|
'strip_math_space': filters.strip_math_space,
|
|
|
'wrap_text': filters.wrap_text,
|
|
|
'escape_latex': filters.escape_latex
|
|
|
}
|
|
|
|
|
|
#-----------------------------------------------------------------------------
|
|
|
# Class
|
|
|
#-----------------------------------------------------------------------------
|
|
|
|
|
|
class ResourcesDict(collections.defaultdict):
|
|
|
def __missing__(self, key):
|
|
|
return ''
|
|
|
|
|
|
|
|
|
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(u'default',
|
|
|
config=True,
|
|
|
help="Name of the template file to use")
|
|
|
def _template_file_changed(self, name, old, new):
|
|
|
if new=='default':
|
|
|
self.template_file = self.default_template
|
|
|
else:
|
|
|
self.template_file = new
|
|
|
default_template = Unicode(u'')
|
|
|
|
|
|
file_extension = Unicode(
|
|
|
'txt', config=True,
|
|
|
help="Extension of the file that should be written to disk"
|
|
|
)
|
|
|
|
|
|
template_path = List(['.'], config=True)
|
|
|
|
|
|
default_template_path = Unicode(
|
|
|
os.path.join("..", "templates"),
|
|
|
help="Path where the template files are located.")
|
|
|
|
|
|
template_skeleton_path = Unicode(
|
|
|
os.path.join("..", "templates", "skeleton"),
|
|
|
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)
|
|
|
|
|
|
#Configurability, allows the user to easily add filters and transformers.
|
|
|
transformers = List(config=True,
|
|
|
help="""List of transformers, by name or namespace, to enable.""")
|
|
|
|
|
|
filters = Dict(config=True,
|
|
|
help="""Dictionary of filters, by name and namespace, to add to the Jinja
|
|
|
environment.""")
|
|
|
|
|
|
default_transformers = List([nbtransformers.coalesce_streams,
|
|
|
nbtransformers.SVG2PDFTransformer,
|
|
|
nbtransformers.ExtractOutputTransformer,
|
|
|
nbtransformers.CSSHTMLHeaderTransformer,
|
|
|
nbtransformers.RevealHelpTransformer,
|
|
|
nbtransformers.LatexTransformer,
|
|
|
nbtransformers.SphinxTransformer],
|
|
|
config=True,
|
|
|
help="""List of transformers available by default, by name, namespace,
|
|
|
instance, or type.""")
|
|
|
|
|
|
|
|
|
def __init__(self, config=None, extra_loaders=None, **kw):
|
|
|
"""
|
|
|
Public constructor
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
config : config
|
|
|
User configuration instance.
|
|
|
extra_loaders : list[of Jinja Loaders]
|
|
|
ordered list of Jinja loder to find templates. Will be tried in order
|
|
|
before the default FileSysteme ones.
|
|
|
template : str (optional, kw arg)
|
|
|
Template to use when exporting.
|
|
|
"""
|
|
|
|
|
|
#Call the base class constructor
|
|
|
c = self.default_config
|
|
|
if config:
|
|
|
c.merge(config)
|
|
|
|
|
|
super(Exporter, self).__init__(config=c, **kw)
|
|
|
|
|
|
#Init
|
|
|
self._init_template(**kw)
|
|
|
self._init_environment(extra_loaders=extra_loaders)
|
|
|
self._init_transformers()
|
|
|
self._init_filters()
|
|
|
|
|
|
|
|
|
@property
|
|
|
def default_config(self):
|
|
|
return Config()
|
|
|
|
|
|
|
|
|
def from_notebook_node(self, nb, resources=None, **kw):
|
|
|
"""
|
|
|
Convert a notebook from a notebook node instance.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
nb : Notebook node
|
|
|
resources : dict (**kw)
|
|
|
of additional resources that can be accessed read/write by
|
|
|
transformers and filters.
|
|
|
"""
|
|
|
nb_copy = copy.deepcopy(nb)
|
|
|
resources = self._init_resources(resources)
|
|
|
|
|
|
# Preprocess
|
|
|
nb_copy, resources = self._transform(nb_copy, resources)
|
|
|
|
|
|
# Try different template names during conversion. First try to load the
|
|
|
# template by name with extension added, then try loading the template
|
|
|
# as if the name is explicitly specified, then try the name as a
|
|
|
# 'flavor', and lastly just try to load the template by module name.
|
|
|
module_name = self.__module__.split('.')[-1]
|
|
|
try_names = [self.template_file + self.template_extension,
|
|
|
self.template_file,
|
|
|
module_name + '_' + self.template_file + self.template_extension,
|
|
|
module_name + self.template_extension]
|
|
|
for try_name in try_names:
|
|
|
try:
|
|
|
self.template = self.environment.get_template(try_name)
|
|
|
break
|
|
|
except TemplateNotFound:
|
|
|
pass
|
|
|
|
|
|
if hasattr(self, 'template'):
|
|
|
output = self.template.render(nb=nb_copy, resources=resources)
|
|
|
else:
|
|
|
raise IOError('template file "%s" could not be found' % self.template_file)
|
|
|
return output, resources
|
|
|
|
|
|
|
|
|
def from_filename(self, filename, resources=None, **kw):
|
|
|
"""
|
|
|
Convert a notebook from a notebook file.
|
|
|
|
|
|
Parameters
|
|
|
----------
|
|
|
filename : str
|
|
|
Full filename of the notebook file to open and convert.
|
|
|
"""
|
|
|
|
|
|
#Pull the metadata from the filesystem.
|
|
|
if resources is None:
|
|
|
resources = ResourcesDict()
|
|
|
if not 'metadata' in resources or resources['metadata'] == '':
|
|
|
resources['metadata'] = ResourcesDict()
|
|
|
basename = os.path.basename(filename)
|
|
|
notebook_name = basename[:basename.rfind('.')]
|
|
|
resources['metadata']['name'] = notebook_name
|
|
|
|
|
|
modified_date = datetime.datetime.fromtimestamp(os.path.getmtime(filename))
|
|
|
resources['metadata']['modified_date'] = modified_date.strftime("%B %-d, %Y")
|
|
|
|
|
|
with io.open(filename) as f:
|
|
|
return self.from_notebook_node(nbformat.read(f, 'json'), resources=resources,**kw)
|
|
|
|
|
|
|
|
|
def from_file(self, file_stream, resources=None, **kw):
|
|
|
"""
|
|
|
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'), resources=resources, **kw)
|
|
|
|
|
|
|
|
|
def register_transformer(self, transformer, enabled=False):
|
|
|
"""
|
|
|
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 transformer is None:
|
|
|
raise TypeError('transformer')
|
|
|
isclass = isinstance(transformer, type)
|
|
|
constructed = not isclass
|
|
|
|
|
|
#Handle transformer's registration based on it's type
|
|
|
if constructed and isinstance(transformer, py3compat.string_types):
|
|
|
#Transformer is a string, import the namespace and recursively call
|
|
|
#this register_transformer method
|
|
|
transformer_cls = import_item(transformer)
|
|
|
return self.register_transformer(transformer_cls, enabled)
|
|
|
|
|
|
if constructed and hasattr(transformer, '__call__'):
|
|
|
#Transformer is a function, no need to construct it.
|
|
|
#Register and return the transformer.
|
|
|
if enabled:
|
|
|
transformer.enabled = True
|
|
|
self._transformers.append(transformer)
|
|
|
return transformer
|
|
|
|
|
|
elif isclass and isinstance(transformer, MetaHasTraits):
|
|
|
#Transformer is configurable. Make sure to pass in new default for
|
|
|
#the enabled flag if one was specified.
|
|
|
self.register_transformer(transformer(parent=self), enabled)
|
|
|
|
|
|
elif isclass:
|
|
|
#Transformer is not configurable, construct it
|
|
|
self.register_transformer(transformer(), enabled)
|
|
|
|
|
|
else:
|
|
|
#Transformer is an instance of something without a __call__
|
|
|
#attribute.
|
|
|
raise TypeError('transformer')
|
|
|
|
|
|
|
|
|
def register_filter(self, name, jinja_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 jinja_filter is None:
|
|
|
raise TypeError('filter')
|
|
|
isclass = isinstance(jinja_filter, type)
|
|
|
constructed = not isclass
|
|
|
|
|
|
#Handle filter's registration based on it's type
|
|
|
if constructed and isinstance(jinja_filter, py3compat.string_types):
|
|
|
#filter is a string, import the namespace and recursively call
|
|
|
#this register_filter method
|
|
|
filter_cls = import_item(jinja_filter)
|
|
|
return self.register_filter(name, filter_cls)
|
|
|
|
|
|
if constructed and hasattr(jinja_filter, '__call__'):
|
|
|
#filter is a function, no need to construct it.
|
|
|
self.environment.filters[name] = jinja_filter
|
|
|
return jinja_filter
|
|
|
|
|
|
elif isclass and isinstance(jinja_filter, MetaHasTraits):
|
|
|
#filter is configurable. Make sure to pass in new default for
|
|
|
#the enabled flag if one was specified.
|
|
|
filter_instance = jinja_filter(parent=self)
|
|
|
self.register_filter(name, filter_instance )
|
|
|
|
|
|
elif isclass:
|
|
|
#filter is not configurable, construct it
|
|
|
filter_instance = jinja_filter()
|
|
|
self.register_filter(name, filter_instance)
|
|
|
|
|
|
else:
|
|
|
#filter is an instance of something without a __call__
|
|
|
#attribute.
|
|
|
raise TypeError('filter')
|
|
|
|
|
|
|
|
|
def _init_template(self, **kw):
|
|
|
"""
|
|
|
Make sure a template name is specified. If one isn't specified, try to
|
|
|
build one from the information we know.
|
|
|
"""
|
|
|
self._template_file_changed('template_file', self.template_file, self.template_file)
|
|
|
if 'template' in kw:
|
|
|
self.template_file = kw['template']
|
|
|
|
|
|
|
|
|
def _init_environment(self, extra_loaders=None):
|
|
|
"""
|
|
|
Create the Jinja templating environment.
|
|
|
"""
|
|
|
here = os.path.dirname(os.path.realpath(__file__))
|
|
|
loaders = []
|
|
|
if extra_loaders:
|
|
|
loaders.extend(extra_loaders)
|
|
|
|
|
|
paths = self.template_path
|
|
|
paths.extend([os.path.join(here, self.default_template_path),
|
|
|
os.path.join(here, self.template_skeleton_path)])
|
|
|
loaders.append(FileSystemLoader(paths))
|
|
|
|
|
|
self.environment = Environment(
|
|
|
loader= ChoiceLoader(loaders),
|
|
|
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 _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
|
|
|
|
