"""Convert Markdown-it tokens to docutils nodes, including sphinx specific elements."""
from __future__ import annotations
import os
from pathlib import Path
from typing import cast
from urllib.parse import unquote
from uuid import uuid4
from docutils import nodes
from markdown_it.tree import SyntaxTreeNode
from sphinx import addnodes
from sphinx.domains.math import MathDomain
from sphinx.environment import BuildEnvironment
from sphinx.ext.intersphinx import InventoryAdapter
from sphinx.util import logging
from myst_parser import inventory
from myst_parser.mdit_to_docutils.base import DocutilsRenderer
LOGGER = logging.getLogger(__name__)
[docs]class SphinxRenderer(DocutilsRenderer):
"""A markdown-it-py renderer to populate (in-place) a `docutils.document` AST.
This is sub-class of `DocutilsRenderer` that handles sphinx specific aspects,
such as cross-referencing.
"""
@property
def sphinx_env(self) -> BuildEnvironment:
return self.document.settings.env
[docs] def render_internal_link(self, token: SyntaxTreeNode) -> None:
"""Render link token `[text](link "title")`,
where the link has not been identified as an external URL.
"""
destination = unquote(cast(str, token.attrGet("href") or ""))
# make the path relative to an "including" document
# this is set when using the `relative-docs` option of the MyST `include` directive
relative_include = self.md_env.get("relative-docs", None)
if relative_include is not None and destination.startswith(relative_include[0]):
source_dir, include_dir = relative_include[1:]
destination = os.path.relpath(
os.path.join(include_dir, os.path.normpath(destination)), source_dir
)
kwargs = {
"refdoc": self.sphinx_env.docname,
"reftype": "myst",
"refexplicit": len(token.children or []) > 0,
}
path_dest, *_path_ids = destination.split("#", maxsplit=1)
path_id = _path_ids[0] if _path_ids else None
potential_path = (
Path(self.sphinx_env.doc2path(self.sphinx_env.docname)).parent / path_dest
if self.sphinx_env.srcdir # not set in some test situations
else None
)
if path_dest == "./":
# this is a special case, where we want to reference the current document
potential_path = (
Path(self.sphinx_env.doc2path(self.sphinx_env.docname))
if self.sphinx_env.srcdir
else None
)
if potential_path and potential_path.is_file():
docname = self.sphinx_env.path2doc(str(potential_path))
if docname:
wrap_node = addnodes.pending_xref(
refdomain="doc", reftarget=docname, reftargetid=path_id, **kwargs
)
classes = ["xref", "myst"]
text = ""
else:
wrap_node = addnodes.download_reference(
refdomain=None, reftarget=path_dest, refwarn=False, **kwargs
)
classes = ["xref", "download", "myst"]
text = destination if not token.children else ""
else:
wrap_node = addnodes.pending_xref(
refdomain=None, reftarget=destination, refwarn=True, **kwargs
)
classes = ["xref", "myst"]
text = ""
self.add_line_and_source_path(wrap_node, token)
self.copy_attributes(token, wrap_node, ("class", "id", "title"))
self.current_node.append(wrap_node)
inner_node = nodes.inline("", text, classes=classes)
wrap_node.append(inner_node)
with self.current_node_context(inner_node):
self.render_children(token)
def get_inventory_matches(
self,
*,
invs: str | None,
domains: str | None,
otypes: str | None,
target: str | None,
) -> list[inventory.InvMatch]:
return list(
inventory.filter_sphinx_inventories(
InventoryAdapter(self.sphinx_env).named_inventory,
invs=invs,
domains=domains,
otypes=otypes,
targets=target,
)
)
[docs] def render_math_block_label(self, token: SyntaxTreeNode) -> None:
"""Render math with referencable labels, e.g. ``$a=1$ (label)``."""
label = token.info
content = token.content
node = nodes.math_block(
content, content, nowrap=False, number=None, label=label
)
target = self.add_math_target(node)
self.add_line_and_source_path(target, token)
self.current_node.append(target)
self.add_line_and_source_path(node, token)
self.current_node.append(node)
def _random_label(self) -> str:
return str(uuid4())
def render_amsmath(self, token: SyntaxTreeNode) -> None:
"""Renderer for the amsmath extension."""
# environment = token.meta["environment"]
content = token.content
if token.meta["numbered"] != "*":
# TODO how to parse and reference labels within environment?
# for now we give create a unique hash, so the equation will be numbered
# but there will be no reference clashes
label = self._random_label()
node = nodes.math_block(
content,
content,
nowrap=True,
number=None,
classes=["amsmath"],
label=label,
)
target = self.add_math_target(node)
self.add_line_and_source_path(target, token)
self.current_node.append(target)
else:
node = nodes.math_block(
content, content, nowrap=True, number=None, classes=["amsmath"]
)
self.add_line_and_source_path(node, token)
self.current_node.append(node)
def add_math_target(self, node: nodes.math_block) -> nodes.target:
# Code mainly copied from sphinx.directives.patches.MathDirective
# register label to domain
domain = cast(MathDomain, self.sphinx_env.get_domain("math"))
domain.note_equation(self.sphinx_env.docname, node["label"], location=node)
node["number"] = domain.get_equation_number_for(node["label"])
node["docname"] = self.sphinx_env.docname
# create target node
node_id = nodes.make_id("equation-%s" % node["label"])
target = nodes.target("", "", ids=[node_id])
self.document.note_explicit_target(target)
return target
