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"""Templates utility functions for Sphinx.
"""
import os
from functools import partial
from os import path
from typing import Callable, Dict, List, Tuple, Union
from jinja2 import TemplateNotFound
from jinja2.environment import Environment
from jinja2.loaders import BaseLoader
from jinja2.sandbox import SandboxedEnvironment
from sphinx import package_dir
from sphinx.jinja2glue import SphinxFileSystemLoader
from sphinx.locale import get_translator
from sphinx.util import rst, texescape
class BaseRenderer:
def __init__(self, loader: BaseLoader = None) -> None:
self.env = SandboxedEnvironment(loader=loader, extensions=['jinja2.ext.i18n'])
self.env.filters['repr'] = repr
self.env.install_gettext_translations(get_translator())
def render(self, template_name: str, context: Dict) -> str:
return self.env.get_template(template_name).render(context)
def render_string(self, source: str, context: Dict) -> str:
return self.env.from_string(source).render(context)
class FileRenderer(BaseRenderer):
def __init__(self, search_path: Union[str, List[str]]) -> None:
if isinstance(search_path, str):
search_path = [search_path]
else:
# filter "None" paths
search_path = list(filter(None, search_path))
loader = SphinxFileSystemLoader(search_path)
super().__init__(loader)
@classmethod
def render_from_file(cls, filename: str, context: Dict) -> str:
dirname = os.path.dirname(filename)
basename = os.path.basename(filename)
return cls(dirname).render(basename, context)
class SphinxRenderer(FileRenderer):
def __init__(self, template_path: Union[str, List[str]] = None) -> None:
if template_path is None:
template_path = os.path.join(package_dir, 'templates')
super().__init__(template_path)
@classmethod
def render_from_file(cls, filename: str, context: Dict) -> str:
return FileRenderer.render_from_file(filename, context)
class LaTeXRenderer(SphinxRenderer):
def __init__(self, template_path: str = None, latex_engine: str = None) -> None:
if template_path is None:
template_path = os.path.join(package_dir, 'templates', 'latex')
super().__init__(template_path)
# use texescape as escape filter
escape = partial(texescape.escape, latex_engine=latex_engine)
self.env.filters['e'] = escape
self.env.filters['escape'] = escape
self.env.filters['eabbr'] = texescape.escape_abbr
# use JSP/eRuby like tagging instead because curly bracket; the default
# tagging of jinja2 is not good for LaTeX sources.
self.env.variable_start_string = '<%='
self.env.variable_end_string = '%>'
self.env.block_start_string = '<%'
self.env.block_end_string = '%>'
self.env.comment_start_string = '<#'
self.env.comment_end_string = '#>'
class ReSTRenderer(SphinxRenderer):
def __init__(self, template_path: Union[str, List[str]] = None, language: str = None) -> None: # NOQA
super().__init__(template_path)
# add language to environment
self.env.extend(language=language)
# use texescape as escape filter
self.env.filters['e'] = rst.escape
self.env.filters['escape'] = rst.escape
self.env.filters['heading'] = rst.heading
class SphinxTemplateLoader(BaseLoader):
"""A loader supporting template inheritance"""
def __init__(self, confdir: str, templates_paths: List[str],
system_templates_paths: List[str]) -> None:
self.loaders = []
self.sysloaders = []
for templates_path in templates_paths:
loader = SphinxFileSystemLoader(path.join(confdir, templates_path))
self.loaders.append(loader)
for templates_path in system_templates_paths:
loader = SphinxFileSystemLoader(templates_path)
self.loaders.append(loader)
self.sysloaders.append(loader)
def get_source(self, environment: Environment, template: str) -> Tuple[str, str, Callable]:
if template.startswith('!'):
# search a template from ``system_templates_paths``
loaders = self.sysloaders
template = template[1:]
else:
loaders = self.loaders
for loader in loaders:
try:
return loader.get_source(environment, template)
except TemplateNotFound:
pass
raise TemplateNotFound(template)
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