624 lines
25 KiB
Python
624 lines
25 KiB
Python
"""This module defines TemplateExporter, 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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# Copyright (c) IPython Development Team.
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# Distributed under the terms of the Modified BSD License.
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from __future__ import print_function, absolute_import
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import os
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import uuid
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import json
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import warnings
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from pathlib import Path
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from jupyter_core.paths import jupyter_path
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from traitlets import HasTraits, Unicode, List, Dict, Bool, default, observe, validate
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from traitlets.config import Config
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from traitlets.utils.importstring import import_item
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from jupyter_core.paths import jupyter_path
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from jupyter_core.utils import ensure_dir_exists
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from jinja2 import (
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TemplateNotFound, Environment, ChoiceLoader, FileSystemLoader, BaseLoader,
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DictLoader
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)
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from nbconvert import filters
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from .exporter import Exporter
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# Jinja2 extensions to load.
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JINJA_EXTENSIONS = ['jinja2.ext.loopcontrols']
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ROOT = os.path.dirname(__file__)
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DEV_MODE = os.path.exists(os.path.join(ROOT, '../../setup.py')) and os.path.exists(os.path.join(ROOT, '../../share'))
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default_filters = {
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'indent': filters.indent,
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'markdown2html': filters.markdown2html,
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'markdown2asciidoc': filters.markdown2asciidoc,
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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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'wrap_text': filters.wrap_text,
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'escape_latex': filters.escape_latex,
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'citation2latex': filters.citation2latex,
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'path2url': filters.path2url,
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'add_prompts': filters.add_prompts,
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'ascii_only': filters.ascii_only,
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'prevent_list_blocks': filters.prevent_list_blocks,
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'get_metadata': filters.get_metadata,
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'convert_pandoc': filters.convert_pandoc,
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'json_dumps': json.dumps,
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'strip_trailing_newline': filters.strip_trailing_newline,
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}
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# copy of https://github.com/jupyter/jupyter_server/blob/b62458a7f5ad6b5246d2f142258dedaa409de5d9/jupyter_server/config_manager.py#L19
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def recursive_update(target, new):
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"""Recursively update one dictionary using another.
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None values will delete their keys.
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"""
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for k, v in new.items():
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if isinstance(v, dict):
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if k not in target:
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target[k] = {}
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recursive_update(target[k], v)
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if not target[k]:
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# Prune empty subdicts
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del target[k]
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elif v is None:
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target.pop(k, None)
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else:
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target[k] = v
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return target # return for convenience
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# define function at the top level to avoid pickle errors
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def deprecated(msg):
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warnings.warn(msg, DeprecationWarning)
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class ExtensionTolerantLoader(BaseLoader):
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"""A template loader which optionally adds a given extension when searching.
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Constructor takes two arguments: *loader* is another Jinja loader instance
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to wrap. *extension* is the extension, which will be added to the template
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name if finding the template without it fails. This should include the dot,
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e.g. '.tpl'.
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"""
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def __init__(self, loader, extension):
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self.loader = loader
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self.extension = extension
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def get_source(self, environment, template):
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try:
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return self.loader.get_source(environment, template)
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except TemplateNotFound:
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if template.endswith(self.extension):
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raise TemplateNotFound(template)
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return self.loader.get_source(environment, template+self.extension)
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def list_templates(self):
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return self.loader.list_templates()
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class TemplateExporter(Exporter):
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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/preprocessors. If the filters/
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preprocessors 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 available by default for templates:
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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(
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sorted(default_filters.keys())))
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_template_cached = None
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def _invalidate_template_cache(self, change=None):
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self._template_cached = None
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@property
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def template(self):
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if self._template_cached is None:
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self._template_cached = self._load_template()
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return self._template_cached
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_environment_cached = None
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def _invalidate_environment_cache(self, change=None):
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self._environment_cached = None
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self._invalidate_template_cache()
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@property
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def environment(self):
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if self._environment_cached is None:
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self._environment_cached = self._create_environment()
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return self._environment_cached
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@property
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def default_config(self):
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c = Config({
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'RegexRemovePreprocessor': {
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'enabled': True
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},
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'TagRemovePreprocessor': {
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'enabled': True
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}
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})
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c.merge(super().default_config)
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return c
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template_name = Unicode(help="Name of the template to use"
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).tag(config=True, affects_template=True)
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template_file = Unicode(None, allow_none=True,
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help="Name of the template file to use"
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).tag(config=True, affects_template=True)
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raw_template = Unicode('', help="raw template string").tag(affects_environment=True)
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enable_async = Bool(False, help="Enable Jinja async template execution").tag(affects_environment=True)
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_last_template_file = ""
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_raw_template_key = "<memory>"
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@validate('template_name')
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def _template_name_validate(self, change):
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template_name = change['value']
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if template_name and template_name.endswith('.tpl'):
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warnings.warn(
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f"5.x style template name passed '{self.template_name}'. Use --template-name for the template directory with a index.<ext>.j2 file and/or --template-file to denote a different template.",
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DeprecationWarning)
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directory, self.template_file = os.path.split(self.template_name)
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if directory:
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directory, template_name = os.path.split(directory)
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if directory:
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if os.path.isabs(directory):
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self.extra_template_basedirs = [directory]
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return template_name
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@observe('template_file')
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def _template_file_changed(self, change):
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new = change['new']
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if new == 'default':
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self.template_file = self.default_template
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return
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# check if template_file is a file path
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# rather than a name already on template_path
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full_path = os.path.abspath(new)
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if os.path.isfile(full_path):
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directory, self.template_file = os.path.split(full_path)
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self.extra_template_paths = [directory] + self.extra_template_paths
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# While not strictly an invalid template file name, the extension hints that there isn't a template directory involved
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if self.template_file.endswith('.tpl'):
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warnings.warn(
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f"5.x style template file passed '{new}'. Use --template-name for the template directory with a index.<ext>.j2 file and/or --template-file to denote a different template.",
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DeprecationWarning)
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@default('template_file')
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def _template_file_default(self):
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if self.template_extension:
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return 'index' + self.template_extension
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@observe('raw_template')
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def _raw_template_changed(self, change):
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if not change['new']:
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self.template_file = self._last_template_file
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self._invalidate_template_cache()
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template_paths = List(['.']).tag(config=True, affects_environment=True)
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extra_template_basedirs = List().tag(config=True, affects_environment=True)
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extra_template_paths = List([]).tag(config=True, affects_environment=True)
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@default('extra_template_basedirs')
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def _default_extra_template_basedirs(self):
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return [os.getcwd()]
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#Extension that the template files use.
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template_extension = Unicode().tag(config=True, affects_environment=True)
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template_data_paths = List(
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jupyter_path('nbconvert','templates'),
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help="Path where templates can be installed too."
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).tag(affects_environment=True)
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#Extension that the template files use.
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template_extension = Unicode().tag(config=True, affects_environment=True)
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@default('template_extension')
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def _template_extension_default(self):
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if self.file_extension:
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return self.file_extension + '.j2'
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else:
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return self.file_extension
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exclude_input = Bool(False,
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help = "This allows you to exclude code cell inputs from all templates if set to True."
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).tag(config=True)
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exclude_input_prompt = Bool(False,
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help = "This allows you to exclude input prompts from all templates if set to True."
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).tag(config=True)
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exclude_output = Bool(False,
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help = "This allows you to exclude code cell outputs from all templates if set to True."
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).tag(config=True)
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exclude_output_prompt = Bool(False,
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help = "This allows you to exclude output prompts from all templates if set to True."
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).tag(config=True)
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exclude_code_cell = Bool(False,
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help = "This allows you to exclude code cells from all templates if set to True."
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).tag(config=True)
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exclude_markdown = Bool(False,
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help = "This allows you to exclude markdown cells from all templates if set to True."
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).tag(config=True)
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exclude_raw = Bool(False,
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help = "This allows you to exclude raw cells from all templates if set to True."
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).tag(config=True)
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exclude_unknown = Bool(False,
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help = "This allows you to exclude unknown cells from all templates if set to True."
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).tag(config=True)
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extra_loaders = List(
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help="Jinja loaders to find templates. Will be tried in order "
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"before the default FileSystem ones.",
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).tag(affects_environment=True)
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filters = Dict(
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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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).tag(config=True, affects_environment=True)
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raw_mimetypes = List(
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help="""formats of raw cells to be included in this Exporter's output."""
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).tag(config=True)
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@default('raw_mimetypes')
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def _raw_mimetypes_default(self):
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return [self.output_mimetype, '']
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# TODO: passing config is wrong, but changing this revealed more complicated issues
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def __init__(self, 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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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_file : str (optional, kw arg)
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Template to use when exporting.
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"""
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super().__init__(config=config, **kw)
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self.observe(self._invalidate_environment_cache,
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list(self.traits(affects_environment=True)))
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self.observe(self._invalidate_template_cache,
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list(self.traits(affects_template=True)))
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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 triggered by various trait changes that would change the template.
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"""
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# this gives precedence to a raw_template if present
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with self.hold_trait_notifications():
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if self.template_file != self._raw_template_key:
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self._last_template_file = self.template_file
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if self.raw_template:
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self.template_file = self._raw_template_key
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if not self.template_file:
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raise ValueError("No template_file specified!")
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# 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.
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template_file = self.template_file
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self.log.debug("Attempting to load template %s", template_file)
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self.log.debug(" template_paths: %s", os.pathsep.join(self.template_paths))
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return self.environment.get_template(template_file)
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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 : `nbformat.NotebookNode`
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Notebook node
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resources : dict
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Additional resources that can be accessed read/write by
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preprocessors and filters.
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"""
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nb_copy, resources = super().from_notebook_node(nb, resources, **kw)
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resources.setdefault('raw_mimetypes', self.raw_mimetypes)
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resources['global_content_filter'] = {
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'include_code': not self.exclude_code_cell,
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'include_markdown': not self.exclude_markdown,
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'include_raw': not self.exclude_raw,
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'include_unknown': not self.exclude_unknown,
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'include_input': not self.exclude_input,
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'include_output': not self.exclude_output,
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'include_input_prompt': not self.exclude_input_prompt,
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'include_output_prompt': not self.exclude_output_prompt,
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'no_prompt': self.exclude_input_prompt and self.exclude_output_prompt,
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}
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# Top level variables are passed to the template_exporter here.
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output = self.template.render(nb=nb_copy, resources=resources)
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output = output.lstrip('\r\n')
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return output, resources
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def _register_filter(self, environ, 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 accessible 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, (str,)):
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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(environ, 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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environ.filters[name] = jinja_filter
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return jinja_filter
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elif isclass and issubclass(jinja_filter, HasTraits):
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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(environ, name, filter_instance)
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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(environ, 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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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 accessible 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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return self._register_filter(self.environment, name, jinja_filter)
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def default_filters(self):
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"""Override in subclasses to provide extra filters.
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This should return an iterable of 2-tuples: (name, class-or-function).
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You should call the method on the parent class and include the filters
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it provides.
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If a name is repeated, the last filter provided wins. Filters from
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user-supplied config win over filters provided by classes.
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"""
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return default_filters.items()
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def _create_environment(self):
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"""
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Create the Jinja templating environment.
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"""
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paths = self.template_paths
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self.log.debug('Template paths:\n\t%s', '\n\t'.join(paths))
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loaders = self.extra_loaders + [
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ExtensionTolerantLoader(FileSystemLoader(paths), self.template_extension),
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DictLoader({self._raw_template_key: self.raw_template})
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]
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environment = Environment(
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loader=ChoiceLoader(loaders),
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extensions=JINJA_EXTENSIONS,
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enable_async=self.enable_async
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)
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environment.globals['uuid4'] = uuid.uuid4
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# Add default filters to the Jinja2 environment
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for key, value in self.default_filters():
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self._register_filter(environment, key, value)
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# Load user filters. Overwrite existing filters if need be.
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if self.filters:
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for key, user_filter in self.filters.items():
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self._register_filter(environment, key, user_filter)
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return environment
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def _init_preprocessors(self):
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super()._init_preprocessors()
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conf = self._get_conf()
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preprocessors = conf.get('preprocessors', {})
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# preprocessors is a dict for three reasons
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# * We rely on recursive_update, which can only merge dicts, lists will be overwritten
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# * We can use the key with numerical prefixing to guarantee ordering (/etc/*.d/XY-file style)
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# * We can disable preprocessors by overwriting the value with None
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for key, preprocessor in sorted(preprocessors.items(), key=lambda x: x[0]):
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if preprocessor is not None:
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kwargs = preprocessor.copy()
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preprocessor_cls = kwargs.pop('type')
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preprocessor_cls = import_item(preprocessor_cls)
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preprocessor = preprocessor_cls(**kwargs)
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self.register_preprocessor(preprocessor)
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def _get_conf(self):
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conf = {} # the configuration once all conf files are merged
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for path in map(Path, self.template_paths):
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conf_path = path / 'conf.json'
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if conf_path.exists():
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|
with conf_path.open() as f:
|
|
conf = recursive_update(conf, json.load(f))
|
|
return conf
|
|
|
|
@default('template_paths')
|
|
def _template_paths(self, prune=True, root_dirs=None):
|
|
paths = []
|
|
root_dirs = self.get_prefix_root_dirs()
|
|
template_names = self.get_template_names()
|
|
for template_name in template_names:
|
|
for base_dir in self.extra_template_basedirs:
|
|
path = os.path.join(base_dir, template_name)
|
|
if not prune or os.path.exists(path):
|
|
paths.append(path)
|
|
for root_dir in root_dirs:
|
|
base_dir = os.path.join(root_dir, 'nbconvert', 'templates')
|
|
path = os.path.join(base_dir, template_name)
|
|
if not prune or os.path.exists(path):
|
|
paths.append(path)
|
|
|
|
for root_dir in root_dirs:
|
|
# we include root_dir for when we want to be very explicit, e.g.
|
|
# {% extends 'nbconvert/templates/classic/base.html' %}
|
|
paths.append(root_dir)
|
|
# we include base_dir for when we want to be explicit, but less than root_dir, e.g.
|
|
# {% extends 'classic/base.html' %}
|
|
base_dir = os.path.join(root_dir, 'nbconvert', 'templates')
|
|
paths.append(base_dir)
|
|
|
|
compatibility_dir = os.path.join(root_dir, 'nbconvert', 'templates', 'compatibility')
|
|
paths.append(compatibility_dir)
|
|
|
|
additional_paths = self.template_data_paths
|
|
for path in additional_paths:
|
|
try:
|
|
ensure_dir_exists(path, mode=0o700)
|
|
except OSError:
|
|
pass
|
|
|
|
return self.extra_template_paths + additional_paths + paths
|
|
|
|
@classmethod
|
|
def get_compatibility_base_template_conf(cls, name):
|
|
# Hard-coded base template confs to use for backwards compatibility for 5.x-only templates
|
|
if name == 'display_priority':
|
|
return dict(base_template='base')
|
|
if name == 'full':
|
|
return dict(base_template='classic', mimetypes={"text/html": True})
|
|
|
|
def get_template_names(self):
|
|
# finds a list of template names where each successive template name is the base template
|
|
template_names = []
|
|
root_dirs = self.get_prefix_root_dirs()
|
|
base_template = self.template_name
|
|
merged_conf = {} # the configuration once all conf files are merged
|
|
while base_template is not None:
|
|
template_names.append(base_template)
|
|
conf = {}
|
|
found_at_least_one = False
|
|
for base_dir in self.extra_template_basedirs:
|
|
template_dir = os.path.join(base_dir, base_template)
|
|
if os.path.exists(template_dir):
|
|
found_at_least_one = True
|
|
conf_file = os.path.join(template_dir, 'conf.json')
|
|
if os.path.exists(conf_file):
|
|
with open(conf_file) as f:
|
|
conf = recursive_update(json.load(f), conf)
|
|
for root_dir in root_dirs:
|
|
template_dir = os.path.join(root_dir, 'nbconvert', 'templates', base_template)
|
|
if os.path.exists(template_dir):
|
|
found_at_least_one = True
|
|
conf_file = os.path.join(template_dir, 'conf.json')
|
|
if os.path.exists(conf_file):
|
|
with open(conf_file) as f:
|
|
conf = recursive_update(json.load(f), conf)
|
|
if not found_at_least_one:
|
|
# Check for backwards compatibility template names
|
|
for root_dir in root_dirs:
|
|
compatibility_file = base_template + '.tpl'
|
|
compatibility_path = os.path.join(root_dir, 'nbconvert', 'templates', 'compatibility', compatibility_file)
|
|
if os.path.exists(compatibility_path):
|
|
found_at_least_one = True
|
|
warnings.warn(
|
|
f"5.x template name passed '{self.template_name}'. Use 'lab' or 'classic' for new template usage.",
|
|
DeprecationWarning)
|
|
self.template_file = compatibility_file
|
|
conf = self.get_compatibility_base_template_conf(base_template)
|
|
self.template_name = conf.get('base_template')
|
|
break
|
|
if not found_at_least_one:
|
|
paths = "\n\t".join(root_dirs)
|
|
raise ValueError('No template sub-directory with name %r found in the following paths:\n\t%s' % (base_template, paths))
|
|
merged_conf = recursive_update(dict(conf), merged_conf)
|
|
base_template = conf.get('base_template')
|
|
conf = merged_conf
|
|
mimetypes = [mimetype for mimetype, enabled in conf.get('mimetypes', {}).items() if enabled]
|
|
if self.output_mimetype and self.output_mimetype not in mimetypes and mimetypes:
|
|
supported_mimetypes = '\n\t'.join(mimetypes)
|
|
raise ValueError('Unsupported mimetype %r for template %r, mimetypes supported are: \n\t%s' %\
|
|
(self.output_mimetype, self.template_name, supported_mimetypes))
|
|
return template_names
|
|
|
|
def get_prefix_root_dirs(self):
|
|
# We look at the usual jupyter locations, and for development purposes also
|
|
# relative to the package directory (first entry, meaning with highest precedence)
|
|
root_dirs = []
|
|
if DEV_MODE:
|
|
root_dirs.append(os.path.abspath(os.path.join(ROOT, '..', '..', 'share', 'jupyter')))
|
|
root_dirs.extend(jupyter_path())
|
|
return root_dirs
|
|
|
|
def _init_resources(self, resources):
|
|
resources = super()._init_resources(resources)
|
|
resources['deprecated'] = deprecated
|
|
return resources
|