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"""A Base class for additional parsers."""
from __future__ import annotations
from typing import TYPE_CHECKING, Any
import docutils.parsers
import docutils.parsers.rst
from docutils import nodes
from docutils.parsers.rst import states
from docutils.statemachine import StringList
from docutils.transforms import Transform
from docutils.transforms.universal import SmartQuotes
from sphinx.config import Config
from sphinx.environment import BuildEnvironment
from sphinx.util.rst import append_epilog, prepend_prolog
if TYPE_CHECKING:
from sphinx.application import Sphinx
class Parser(docutils.parsers.Parser):
"""
A base class of source parsers. The additional parsers should inherit this class instead
of ``docutils.parsers.Parser``. Compared with ``docutils.parsers.Parser``, this class
improves accessibility to Sphinx APIs.
The subclasses can access sphinx core runtime objects (app, config and env).
"""
#: The config object
config: Config
#: The environment object
env: BuildEnvironment
def set_application(self, app: Sphinx) -> None:
"""set_application will be called from Sphinx to set app and other instance variables
:param sphinx.application.Sphinx app: Sphinx application object
"""
self._app = app
self.config = app.config
self.env = app.env
class RSTParser(docutils.parsers.rst.Parser, Parser):
"""A reST parser for Sphinx."""
def get_transforms(self) -> list[type[Transform]]:
"""
Sphinx's reST parser replaces a transform class for smart-quotes by its own
refs: sphinx.io.SphinxStandaloneReader
"""
transforms = super().get_transforms()
transforms.remove(SmartQuotes)
return transforms
def parse(self, inputstring: str | StringList, document: nodes.document) -> None:
"""Parse text and generate a document tree."""
self.setup_parse(inputstring, document) # type: ignore
self.statemachine = states.RSTStateMachine(
state_classes=self.state_classes,
initial_state=self.initial_state,
debug=document.reporter.debug_flag)
# preprocess inputstring
if isinstance(inputstring, str):
lines = docutils.statemachine.string2lines(
inputstring, tab_width=document.settings.tab_width,
convert_whitespace=True)
inputlines = StringList(lines, document.current_source)
else:
inputlines = inputstring
self.decorate(inputlines)
self.statemachine.run(inputlines, document, inliner=self.inliner)
self.finish_parse()
def decorate(self, content: StringList) -> None:
"""Preprocess reST content before parsing."""
prepend_prolog(content, self.config.rst_prolog)
append_epilog(content, self.config.rst_epilog)
def setup(app: Sphinx) -> dict[str, Any]:
app.add_source_parser(RSTParser)
return {
'version': 'builtin',
'parallel_read_safe': True,
'parallel_write_safe': True,
}
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