Source code for sasmodels.rst2html

r"""
Convert a restructured text document to html.

Inline math markup can uses the *math* directive, or it can use latex
style *\$expression\$*.  Math can be rendered using simple html and
unicode, or with mathjax.
"""

import re
from contextlib import contextmanager

# CRUFT: locale.getlocale() fails on some versions of OS X
# See https://bugs.python.org/issue18378
import locale
if hasattr(locale, '_parse_localename'):
    try:
        locale._parse_localename('UTF-8')
    except ValueError:
        _old_parse_localename = locale._parse_localename
        def _parse_localename(localename):
            code = locale.normalize(localename)
            if code == 'UTF-8':
                return None, code
            else:
                return _old_parse_localename(localename)
        locale._parse_localename = _parse_localename

from docutils.core import publish_parts
from docutils.writers.html4css1 import HTMLTranslator
from docutils.nodes import SkipNode

[docs]def rst2html(rst, part="whole", math_output="mathjax"): r""" Convert restructured text into simple html. Valid *math_output* formats for formulas include: - html - mathml - mathjax See `<http://docutils.sourceforge.net/docs/user/config.html#math-output>`_ for details. The following *part* choices are available: - whole: the entire html document - html_body: document division with title and contents and footer - body: contents only There are other parts, but they don't make sense alone: subtitle, version, encoding, html_prolog, header, meta, html_title, title, stylesheet, html_subtitle, html_body, body, head, body_suffix, fragment, docinfo, html_head, head_prefix, body_prefix, footer, body_pre_docinfo, whole """ # Ick! mathjax doesn't work properly with math-output, and the # others don't work properly with math_output! if math_output == "mathjax": # TODO: this is copied from docs/conf.py; there should be only one mathjax_path = "https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-MML-AM_CHTML" settings = {"math_output": math_output + " " + mathjax_path} else: settings = {"math-output": math_output} # TODO: support stylesheets #html_root = "/full/path/to/_static/" #sheets = [html_root+s for s in ["basic.css","classic.css"]] #settings["embed_styesheet"] = True #settings["stylesheet_path"] = sheets # math2html and mathml do not support \frac12 rst = replace_compact_fraction(rst) # mathml, html do not support \tfrac if math_output in ("mathml", "html"): rst = rst.replace(r'\tfrac', r'\frac') rst = replace_dollar(rst) with suppress_html_errors(): parts = publish_parts(source=rst, writer_name='html', settings_overrides=settings) return parts[part]
@contextmanager
[docs]def suppress_html_errors(): r""" Context manager for keeping error reports out of the generated HTML. Within the context, system message nodes in the docutils parse tree will be ignored. After the context, the usual behaviour will be restored. """ visit_system_message = HTMLTranslator.visit_system_message HTMLTranslator.visit_system_message = _skip_node yield None HTMLTranslator.visit_system_message = visit_system_message
def _skip_node(self, node): raise SkipNode _compact_fraction = re.compile(r"(\\[cdt]?frac)([0-9])([0-9])")
[docs]def replace_compact_fraction(content): r""" Convert \frac12 to \frac{1}{2} for broken latex parsers """ return _compact_fraction.sub(r"\1{\2}{\3}", content)
_dollar = re.compile(r"(?:^|(?<=\s|[-(]))[$]([^\n]*?)(?<![\\])[$](?:$|(?=\s|[-.,;:?\\)]))") _notdollar = re.compile(r"\\[$]")
[docs]def replace_dollar(content): r""" Convert dollar signs to inline math markup in rst. """ content = _dollar.sub(r":math:`\1`", content) content = _notdollar.sub("$", content) return content
[docs]def test_dollar(): """ Test substitution of dollar signs with equivalent RST math markup """ assert replace_dollar(u"no dollar") == u"no dollar" assert replace_dollar(u"$only$") == u":math:`only`" assert replace_dollar(u"$first$ is good") == u":math:`first` is good" assert replace_dollar(u"so is $last$") == u"so is :math:`last`" assert replace_dollar(u"and $mid$ too") == u"and :math:`mid` too" assert replace_dollar(u"$first$, $mid$, $last$") == u":math:`first`, :math:`mid`, :math:`last`" assert replace_dollar(u"dollar\\$ escape") == u"dollar$ escape" assert replace_dollar(u"dollar \\$escape\\$ too") == u"dollar $escape$ too" assert replace_dollar(u"spaces $in the$ math") == u"spaces :math:`in the` math" assert replace_dollar(u"emb\\ $ed$\\ ed") == u"emb\\ :math:`ed`\\ ed" assert replace_dollar(u"$first$a") == u"$first$a" assert replace_dollar(u"a$last$") == u"a$last$" assert replace_dollar(u"$37") == u"$37" assert replace_dollar(u"($37)") == u"($37)" assert replace_dollar(u"$37 - $43") == u"$37 - $43" assert replace_dollar(u"($37, $38)") == u"($37, $38)" assert replace_dollar(u"a $mid$dle a") == u"a $mid$dle a" assert replace_dollar(u"a ($in parens$) a") == u"a (:math:`in parens`) a" assert replace_dollar(u"a (again $in parens$) a") == u"a (again :math:`in parens`) a"
[docs]def load_rst_as_html(filename): from os.path import expanduser with open(expanduser(filename)) as fid: rst = fid.read() html = rst2html(rst) return html
[docs]def wxview(html, url="", size=(850, 540)): import wx from wx.html2 import WebView frame = wx.Frame(None, -1, size=size) view = WebView.New(frame) view.SetPage(html, url) frame.Show() return frame
[docs]def view_html_wxapp(html, url=""): import wx # type: ignore app = wx.App() frame = wxview(html, url) app.MainLoop()
[docs]def view_url_wxapp(url): import wx # type: ignore from wx.html2 import WebView app = wx.App() frame = wx.Frame(None, -1, size=(850, 540)) view = WebView.New(frame) view.LoadURL(url) frame.Show() app.MainLoop()
[docs]def qtview(html, url=""): try: from PyQt5.QtWebKitWidgets import QWebView from PyQt5.QtCore import QUrl except ImportError: from PyQt4.QtWebKit import QWebView from PyQt4.QtCore import QUrl helpView = QWebView() helpView.setHtml(html, QUrl(url)) helpView.show() return helpView
[docs]def view_html_qtapp(html, url=""): import sys try: from PyQt5.QtWidgets import QApplication except ImportError: from PyQt4.QtGui import QApplication app = QApplication([]) frame = qtview(html, url) sys.exit(app.exec_())
[docs]def view_url_qtapp(url): import sys try: from PyQt5.QtWidgets import QApplication except ImportError: from PyQt4.QtGui import QApplication app = QApplication([]) try: from PyQt5.QtWebKitWidgets import QWebView from PyQt5.QtCore import QUrl except ImportError: from PyQt4.QtWebKit import QWebView from PyQt4.QtCore import QUrl frame = QWebView() frame.load(QUrl(url)) frame.show() sys.exit(app.exec_())
# Set default html viewer view_html = view_html_qtapp
[docs]def can_use_qt(): """ Return True if QWebView exists. Checks first in PyQt5 then in PyQt4 """ try: from PyQt5.QtWebKitWidgets import QWebView return True except ImportError: try: from PyQt4.QtWebKit import QWebView return True except ImportError: return False
[docs]def view_help(filename, qt=False): import os if qt: qt = can_use_qt() url = "file:///"+os.path.abspath(filename).replace("\\", "/") if filename.endswith('.rst'): html = load_rst_as_html(filename) if qt: view_html_qtapp(html, url) else: view_html_wxapp(html, url) else: if qt: view_url_qtapp(url) else: view_url_wxapp(url)
[docs]def main(): import sys view_help(sys.argv[1], qt=False)
if __name__ == "__main__": main()