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"""Input/Output files
"""
import codecs
from typing import TYPE_CHECKING, Any, List, Type
from docutils import nodes
from docutils.core import Publisher
from docutils.frontend import Values
from docutils.io import FileInput, Input, NullOutput
from docutils.parsers import Parser
from docutils.parsers.rst import Parser as RSTParser
from docutils.readers import standalone
from docutils.transforms import Transform
from docutils.transforms.references import DanglingReferences
from docutils.writers import UnfilteredWriter
from sphinx import addnodes
from sphinx.environment import BuildEnvironment
from sphinx.transforms import (AutoIndexUpgrader, DoctreeReadEvent, FigureAligner,
SphinxTransformer)
from sphinx.transforms.i18n import (Locale, PreserveTranslatableMessages,
RemoveTranslatableInline)
from sphinx.transforms.references import SphinxDomains
from sphinx.util import UnicodeDecodeErrorHandler, get_filetype, logging
from sphinx.util.docutils import LoggingReporter
from sphinx.versioning import UIDTransform
if TYPE_CHECKING:
from sphinx.application import Sphinx
logger = logging.getLogger(__name__)
class SphinxBaseReader(standalone.Reader):
"""
A base class of readers for Sphinx.
This replaces reporter by Sphinx's on generating document.
"""
transforms: List[Type[Transform]] = []
def __init__(self, *args: Any, **kwargs: Any) -> None:
from sphinx.application import Sphinx
if len(args) > 0 and isinstance(args[0], Sphinx):
self._app = args[0]
self._env = self._app.env
args = args[1:]
super().__init__(*args, **kwargs)
def setup(self, app: "Sphinx") -> None:
self._app = app # hold application object only for compatibility
self._env = app.env
def get_transforms(self) -> List[Type[Transform]]:
transforms = super().get_transforms() + self.transforms
# remove transforms which is not needed for Sphinx
unused = [DanglingReferences]
for transform in unused:
if transform in transforms:
transforms.remove(transform)
return transforms
def new_document(self) -> nodes.document:
"""
Creates a new document object which has a special reporter object good
for logging.
"""
document = super().new_document()
document.__class__ = addnodes.document # replace the class with patched version
# substitute transformer
document.transformer = SphinxTransformer(document)
document.transformer.set_environment(self.settings.env)
# substitute reporter
reporter = document.reporter
document.reporter = LoggingReporter.from_reporter(reporter)
return document
class SphinxStandaloneReader(SphinxBaseReader):
"""
A basic document reader for Sphinx.
"""
def setup(self, app: "Sphinx") -> None:
self.transforms = self.transforms + app.registry.get_transforms()
super().setup(app)
def read(self, source: Input, parser: Parser, settings: Values) -> nodes.document:
self.source = source
if not self.parser:
self.parser = parser
self.settings = settings
self.input = self.read_source(settings.env)
self.parse()
return self.document
def read_source(self, env: BuildEnvironment) -> str:
"""Read content from source and do post-process."""
content = self.source.read()
# emit "source-read" event
arg = [content]
env.events.emit('source-read', env.docname, arg)
return arg[0]
class SphinxI18nReader(SphinxBaseReader):
"""
A document reader for i18n.
This returns the source line number of original text as current source line number
to let users know where the error happened.
Because the translated texts are partial and they don't have correct line numbers.
"""
def setup(self, app: "Sphinx") -> None:
super().setup(app)
self.transforms = self.transforms + app.registry.get_transforms()
unused = [PreserveTranslatableMessages, Locale, RemoveTranslatableInline,
AutoIndexUpgrader, FigureAligner, SphinxDomains, DoctreeReadEvent,
UIDTransform]
for transform in unused:
if transform in self.transforms:
self.transforms.remove(transform)
class SphinxDummyWriter(UnfilteredWriter):
"""Dummy writer module used for generating doctree."""
supported = ('html',) # needed to keep "meta" nodes
def translate(self) -> None:
pass
def SphinxDummySourceClass(source: Any, *args: Any, **kwargs: Any) -> Any:
"""Bypass source object as is to cheat Publisher."""
return source
class SphinxFileInput(FileInput):
"""A basic FileInput for Sphinx."""
def __init__(self, *args: Any, **kwargs: Any) -> None:
kwargs['error_handler'] = 'sphinx'
super().__init__(*args, **kwargs)
def read_doc(app: "Sphinx", env: BuildEnvironment, filename: str) -> nodes.document:
"""Parse a document and convert to doctree."""
# set up error_handler for the target document
error_handler = UnicodeDecodeErrorHandler(env.docname)
codecs.register_error('sphinx', error_handler) # type: ignore
reader = SphinxStandaloneReader()
reader.setup(app)
filetype = get_filetype(app.config.source_suffix, filename)
parser = app.registry.create_source_parser(app, filetype)
if parser.__class__.__name__ == 'CommonMarkParser' and parser.settings_spec == ():
# a workaround for recommonmark
# If recommonmark.AutoStrictify is enabled, the parser invokes reST parser
# internally. But recommonmark-0.4.0 does not provide settings_spec for reST
# parser. As a workaround, this copies settings_spec for RSTParser to the
# CommonMarkParser.
parser.settings_spec = RSTParser.settings_spec
pub = Publisher(reader=reader,
parser=parser,
writer=SphinxDummyWriter(),
source_class=SphinxFileInput,
destination=NullOutput())
pub.process_programmatic_settings(None, env.settings, None)
pub.set_source(source_path=filename)
pub.publish()
return pub.document
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