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# Copyright 2014 Donald Stufft
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# Copied from https://github.com/pypa/readme_renderer
# Commit 5b455a9c5bafc1732dafad9619bcbfa8e15432c9
from __future__ import absolute_import, division, print_function
import io
import os.path
from docutils.core import publish_parts
from docutils.writers.html4css1 import HTMLTranslator, Writer
from docutils.utils import SystemMessage
from .clean import clean
class ReadMeHTMLTranslator(HTMLTranslator):
def depart_image(self, node):
uri = node["uri"]
ext = os.path.splitext(uri)[1].lower()
# we need to swap RST's use of `object` with `img` tags
# see http://git.io/5me3dA
if ext == ".svg":
# preserve essential attributes
atts = {}
for attribute, value in node.attributes.items():
# we have no time for empty values
if value:
if attribute == "uri":
atts["src"] = value
else:
atts[attribute] = value
# toss off `object` tag
self.body.pop()
# add on `img` with attributes
self.body.append(self.starttag(node, "img", **atts))
SETTINGS = {
# Cloaking email addresses provides a small amount of additional
# privacy protection for email addresses inside of a chunk of ReST.
"cloak_email_addresses": True,
# Prevent a lone top level heading from being promoted to document
# title, and thus second level headings from being promoted to top
# level.
"doctitle_xform": True,
# Prevent a lone subsection heading from being promoted to section
# title, and thus second level headings from being promoted to top
# level.
"sectsubtitle_xform": True,
# Set our initial header level
"initial_header_level": 2,
# Prevent local files from being included into the rendered output.
# This is a security concern because people can insert files
# that are part of the system, such as /etc/passwd.
"file_insertion_enabled": False,
# Halt rendering and throw an exception if there was any errors or
# warnings from docutils.
"halt_level": 2,
# Output math blocks as LaTeX that can be interpreted by MathJax for
# a prettier display of Math formulas.
"math_output": "MathJax",
# Disable raw html as enabling it is a security risk, we do not want
# people to be able to include any old HTML in the final output.
"raw_enabled": False,
# Disable all system messages from being reported.
"report_level": 5,
# Use typographic quotes, and transform --, ---, and ... into their
# typographic counterparts.
"smart_quotes": True,
# Strip all comments from the rendered output.
"strip_comments": True,
# PATCH FOR FLIT ----------------------------------
# Disable syntax highlighting so we don't need Pygments installed.
"syntax_highlight": "none",
# -------------------------------------------------
}
def render(raw, stream=None):
if stream is None:
# Use a io.StringIO as the warning stream to prevent warnings from
# being printed to sys.stderr.
stream = io.StringIO()
settings = SETTINGS.copy()
settings["warning_stream"] = stream
writer = Writer()
writer.translator_class = ReadMeHTMLTranslator
try:
parts = publish_parts(raw, writer=writer, settings_overrides=settings)
except SystemMessage:
rendered = None
else:
rendered = parts.get("fragment")
if rendered:
return clean(rendered)
else:
return None
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