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import re
from docutils.core import publish_parts
from docutils.parsers.rst.roles import register_canonical_role
from pysite.rst.roles import icon_role, page_role, url_for_role
RST_TEMPLATE = """.. contents::
{0}"""
CONTENTS_REGEX = re.compile(r"""<div class=\"contents topic\" id=\"contents\">(.*?)</div>""", re.DOTALL)
HREF_REGEX = re.compile(r"""<a class=\"reference internal\" href=\"(.*?)\".*?>(.*?)</a>""")
def render(rst: str, link_headers=True):
if link_headers:
rst = RST_TEMPLATE.format(rst)
html = publish_parts(
source=rst, writer_name="html5", settings_overrides={
"halt_level": 2, "syntax_highlight": "short", "initial_header_level": 3
}
)["html_body"]
data = {
"html": html,
"headers": []
}
if link_headers:
match = CONTENTS_REGEX.search(html) # Find the contents HTML
if match:
data["html"] = html.replace(match.group(0), "") # Remove the contents from the document HTML
depth = 0
headers = []
current_header = {}
group = match.group(1)
# Sanitize the output so we can more easily parse it
group = group.replace("<li>", "<li>\n")
group = group.replace("</li>", "\n</li>")
group = group.replace("<p>", "<p>\n")
group = group.replace("</p>", "\n</p>")
for line in group.split("\n"):
line = line.strip() # Remove excess whitespace
if not line: # Nothing to process
continue
if line.startswith("<li>") and depth <= 2:
# We've found a header, or the start of a header group
depth += 1
elif line.startswith("</li>") and depth >= 0:
# That's the end of a header or header group
if depth == 1:
# We just dealt with an entire header group, so store it
headers.append(current_header.copy()) # Store a copy, since we're clearing the dict
current_header.clear()
depth -= 1
elif line.startswith("<a") and depth <= 2:
# We've found an actual URL
match = HREF_REGEX.match(line) # Parse the line for the ID and header title
if depth == 1: # Top-level header, so just store it in the current header
current_header["id"] = match.group(1)
title = match.group(2)
if title.startswith("<i"): # We've found an icon, which needs to have a space after it
title = title.replace("</i> ", "</i> ")
current_header["title"] = title
else: # Second-level (or deeper) header, should be stored in a list of sub-headers
sub_headers = current_header.get("sub_headers", [])
title = match.group(2)
if title.startswith("<i"): # We've found an icon, which needs to have a space after it
title = title.replace("</i> ", "</i> ")
sub_headers.append({
"id": match.group(1),
"title": title
})
current_header["sub_headers"] = sub_headers
data["headers"] = headers
return data
register_canonical_role("icon", icon_role)
register_canonical_role("page", page_role)
register_canonical_role("url_for", url_for_role)
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