0efa75d6f5
Also pep8, pylint, and style fixes
Covers:
{capa_problem, correctmap, customerender,
inputtypes, responsetypes, util, xqueue_interface}.py
LMS-1744
101 lines
3.0 KiB
Python
101 lines
3.0 KiB
Python
"""
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This has custom renderers: classes that know how to render certain problem tags (e.g. <math> and
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<solution>) to html.
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These tags do not have state, so they just get passed the system (for access to render_template),
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and the xml element.
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"""
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from .registry import TagRegistry
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import logging
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import re
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from lxml import etree
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import xml.sax.saxutils as saxutils
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from .registry import TagRegistry
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log = logging.getLogger(__name__)
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registry = TagRegistry()
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#-----------------------------------------------------------------------------
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class MathRenderer(object):
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tags = ['math']
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def __init__(self, system, xml):
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r"""
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Render math using latex-like formatting.
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Examples:
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<math>$\displaystyle U(r)=4 U_0 $</math>
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<math>$r_0$</math>
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We convert these to [mathjax]...[/mathjax] and [mathjaxinline]...[/mathjaxinline]
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TODO: use shorter tags (but this will require converting problem XML files!)
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"""
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self.system = system
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self.xml = xml
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mathstr = re.sub(r'\$(.*)\$', r'[mathjaxinline]\1[/mathjaxinline]', xml.text)
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mtag = 'mathjax'
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if not r'\displaystyle' in mathstr:
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mtag += 'inline'
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else:
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mathstr = mathstr.replace(r'\displaystyle', '')
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self.mathstr = mathstr.replace('mathjaxinline]', '%s]' % mtag)
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def get_html(self):
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"""
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Return the contents of this tag, rendered to html, as an etree element.
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"""
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# TODO: why are there nested html tags here?? Why are there html tags at all, in fact?
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html = '<html><html>%s</html><html>%s</html></html>' % (
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self.mathstr, saxutils.escape(self.xml.tail))
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try:
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xhtml = etree.XML(html)
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except Exception as err:
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if self.system.DEBUG:
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msg = '<html><div class="inline-error"><p>Error %s</p>' % (
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str(err).replace('<', '<'))
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msg += ('<p>Failed to construct math expression from <pre>%s</pre></p>' %
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html.replace('<', '<'))
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msg += "</div></html>"
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log.error(msg)
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return etree.XML(msg)
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else:
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raise
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return xhtml
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registry.register(MathRenderer)
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#-----------------------------------------------------------------------------
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class SolutionRenderer(object):
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"""
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A solution is just a <span>...</span> which is given an ID, that is used for displaying an
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extended answer (a problem "solution") after "show answers" is pressed.
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Note that the solution content is NOT rendered and returned in the HTML. It is obtained by an
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ajax call.
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"""
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tags = ['solution']
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def __init__(self, system, xml):
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self.system = system
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self.id = xml.get('id')
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def get_html(self):
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context = {'id': self.id}
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html = self.system.render_template("solutionspan.html", context)
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return etree.XML(html)
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registry.register(SolutionRenderer)
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