567 lines
17 KiB
Python
567 lines
17 KiB
Python
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# -*- test-case-name: twisted.web.test.test_template -*-
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# Copyright (c) Twisted Matrix Laboratories.
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# See LICENSE for details.
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"""
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HTML rendering for twisted.web.
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@var VALID_HTML_TAG_NAMES: A list of recognized HTML tag names, used by the
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L{tag} object.
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@var TEMPLATE_NAMESPACE: The XML namespace used to identify attributes and
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elements used by the templating system, which should be removed from the
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final output document.
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@var tags: A convenience object which can produce L{Tag} objects on demand via
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attribute access. For example: C{tags.div} is equivalent to C{Tag("div")}.
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Tags not specified in L{VALID_HTML_TAG_NAMES} will result in an
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L{AttributeError}.
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"""
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__all__ = [
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'TEMPLATE_NAMESPACE', 'VALID_HTML_TAG_NAMES', 'Element', 'TagLoader',
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'XMLString', 'XMLFile', 'renderer', 'flatten', 'flattenString', 'tags',
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'Comment', 'CDATA', 'Tag', 'slot', 'CharRef', 'renderElement'
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]
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import warnings
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from zope.interface import implements
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from cStringIO import StringIO
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from xml.sax import make_parser, handler
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from twisted.web._stan import Tag, slot, Comment, CDATA, CharRef
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from twisted.python.filepath import FilePath
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TEMPLATE_NAMESPACE = 'http://twistedmatrix.com/ns/twisted.web.template/0.1'
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from twisted.web.iweb import ITemplateLoader
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from twisted.python import log
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# Go read the definition of NOT_DONE_YET. For lulz. This is totally
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# equivalent. And this turns out to be necessary, because trying to import
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# NOT_DONE_YET in this module causes a circular import which we cannot escape
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# from. From which we cannot escape. Etc. glyph is okay with this solution for
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# now, and so am I, as long as this comment stays to explain to future
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# maintainers what it means. ~ C.
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#
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# See http://twistedmatrix.com/trac/ticket/5557 for progress on fixing this.
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NOT_DONE_YET = 1
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class _NSContext(object):
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"""
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A mapping from XML namespaces onto their prefixes in the document.
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"""
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def __init__(self, parent=None):
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"""
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Pull out the parent's namespaces, if there's no parent then default to
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XML.
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"""
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self.parent = parent
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if parent is not None:
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self.nss = dict(parent.nss)
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else:
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self.nss = {'http://www.w3.org/XML/1998/namespace':'xml'}
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def get(self, k, d=None):
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"""
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Get a prefix for a namespace.
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@param d: The default prefix value.
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"""
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return self.nss.get(k, d)
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def __setitem__(self, k, v):
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"""
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Proxy through to setting the prefix for the namespace.
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"""
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self.nss.__setitem__(k, v)
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def __getitem__(self, k):
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"""
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Proxy through to getting the prefix for the namespace.
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"""
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return self.nss.__getitem__(k)
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class _ToStan(handler.ContentHandler, handler.EntityResolver):
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"""
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A SAX parser which converts an XML document to the Twisted STAN
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Document Object Model.
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"""
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def __init__(self, sourceFilename):
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"""
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@param sourceFilename: the filename to load the XML out of.
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"""
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self.sourceFilename = sourceFilename
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self.prefixMap = _NSContext()
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self.inCDATA = False
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def setDocumentLocator(self, locator):
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"""
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Set the document locator, which knows about line and character numbers.
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"""
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self.locator = locator
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def startDocument(self):
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"""
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Initialise the document.
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"""
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self.document = []
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self.current = self.document
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self.stack = []
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self.xmlnsAttrs = []
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def endDocument(self):
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"""
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Document ended.
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"""
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def processingInstruction(self, target, data):
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"""
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Processing instructions are ignored.
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"""
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def startPrefixMapping(self, prefix, uri):
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"""
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Set up the prefix mapping, which maps fully qualified namespace URIs
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onto namespace prefixes.
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This gets called before startElementNS whenever an C{xmlns} attribute
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is seen.
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"""
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self.prefixMap = _NSContext(self.prefixMap)
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self.prefixMap[uri] = prefix
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# Ignore the template namespace; we'll replace those during parsing.
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if uri == TEMPLATE_NAMESPACE:
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return
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# Add to a list that will be applied once we have the element.
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if prefix is None:
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self.xmlnsAttrs.append(('xmlns',uri))
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else:
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self.xmlnsAttrs.append(('xmlns:%s'%prefix,uri))
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def endPrefixMapping(self, prefix):
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"""
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"Pops the stack" on the prefix mapping.
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Gets called after endElementNS.
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"""
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self.prefixMap = self.prefixMap.parent
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def startElementNS(self, namespaceAndName, qname, attrs):
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"""
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Gets called when we encounter a new xmlns attribute.
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@param namespaceAndName: a (namespace, name) tuple, where name
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determines which type of action to take, if the namespace matches
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L{TEMPLATE_NAMESPACE}.
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@param qname: ignored.
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@param attrs: attributes on the element being started.
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"""
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filename = self.sourceFilename
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lineNumber = self.locator.getLineNumber()
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columnNumber = self.locator.getColumnNumber()
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ns, name = namespaceAndName
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if ns == TEMPLATE_NAMESPACE:
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if name == 'transparent':
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name = ''
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elif name == 'slot':
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try:
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# Try to get the default value for the slot
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default = attrs[(None, 'default')]
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except KeyError:
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# If there wasn't one, then use None to indicate no
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# default.
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default = None
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el = slot(
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attrs[(None, 'name')], default=default,
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filename=filename, lineNumber=lineNumber,
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columnNumber=columnNumber)
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self.stack.append(el)
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self.current.append(el)
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self.current = el.children
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return
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render = None
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attrs = dict(attrs)
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for k, v in attrs.items():
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attrNS, justTheName = k
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if attrNS != TEMPLATE_NAMESPACE:
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continue
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if justTheName == 'render':
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render = v
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del attrs[k]
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# nonTemplateAttrs is a dictionary mapping attributes that are *not* in
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# TEMPLATE_NAMESPACE to their values. Those in TEMPLATE_NAMESPACE were
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# just removed from 'attrs' in the loop immediately above. The key in
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# nonTemplateAttrs is either simply the attribute name (if it was not
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# specified as having a namespace in the template) or prefix:name,
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# preserving the xml namespace prefix given in the document.
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nonTemplateAttrs = {}
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for (attrNs, attrName), v in attrs.items():
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nsPrefix = self.prefixMap.get(attrNs)
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if nsPrefix is None:
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attrKey = attrName
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else:
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attrKey = '%s:%s' % (nsPrefix, attrName)
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nonTemplateAttrs[attrKey] = v
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if ns == TEMPLATE_NAMESPACE and name == 'attr':
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if not self.stack:
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# TODO: define a better exception for this?
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raise AssertionError(
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'<{%s}attr> as top-level element' % (TEMPLATE_NAMESPACE,))
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if 'name' not in nonTemplateAttrs:
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# TODO: same here
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raise AssertionError(
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'<{%s}attr> requires a name attribute' % (TEMPLATE_NAMESPACE,))
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el = Tag('', render=render, filename=filename,
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lineNumber=lineNumber, columnNumber=columnNumber)
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self.stack[-1].attributes[nonTemplateAttrs['name']] = el
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self.stack.append(el)
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self.current = el.children
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return
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# Apply any xmlns attributes
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if self.xmlnsAttrs:
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nonTemplateAttrs.update(dict(self.xmlnsAttrs))
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self.xmlnsAttrs = []
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# Add the prefix that was used in the parsed template for non-template
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# namespaces (which will not be consumed anyway).
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if ns != TEMPLATE_NAMESPACE and ns is not None:
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prefix = self.prefixMap[ns]
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if prefix is not None:
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name = '%s:%s' % (self.prefixMap[ns],name)
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el = Tag(
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name, attributes=dict(nonTemplateAttrs), render=render,
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filename=filename, lineNumber=lineNumber,
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columnNumber=columnNumber)
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self.stack.append(el)
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self.current.append(el)
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self.current = el.children
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def characters(self, ch):
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"""
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Called when we receive some characters. CDATA characters get passed
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through as is.
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@type ch: C{string}
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"""
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if self.inCDATA:
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self.stack[-1].append(ch)
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return
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self.current.append(ch)
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def endElementNS(self, name, qname):
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"""
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A namespace tag is closed. Pop the stack, if there's anything left in
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it, otherwise return to the document's namespace.
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"""
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self.stack.pop()
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if self.stack:
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self.current = self.stack[-1].children
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else:
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self.current = self.document
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def startDTD(self, name, publicId, systemId):
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"""
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DTDs are ignored.
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"""
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def endDTD(self, *args):
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"""
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DTDs are ignored.
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"""
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def startCDATA(self):
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"""
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We're starting to be in a CDATA element, make a note of this.
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"""
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self.inCDATA = True
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self.stack.append([])
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def endCDATA(self):
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"""
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We're no longer in a CDATA element. Collect up the characters we've
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parsed and put them in a new CDATA object.
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"""
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self.inCDATA = False
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comment = ''.join(self.stack.pop())
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self.current.append(CDATA(comment))
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def comment(self, content):
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"""
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Add an XML comment which we've encountered.
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"""
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self.current.append(Comment(content))
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def _flatsaxParse(fl):
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"""
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Perform a SAX parse of an XML document with the _ToStan class.
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@param fl: The XML document to be parsed.
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@type fl: A file object or filename.
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@return: a C{list} of Stan objects.
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"""
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parser = make_parser()
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parser.setFeature(handler.feature_validation, 0)
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parser.setFeature(handler.feature_namespaces, 1)
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parser.setFeature(handler.feature_external_ges, 0)
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parser.setFeature(handler.feature_external_pes, 0)
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s = _ToStan(getattr(fl, "name", None))
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parser.setContentHandler(s)
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parser.setEntityResolver(s)
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parser.setProperty(handler.property_lexical_handler, s)
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parser.parse(fl)
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return s.document
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class TagLoader(object):
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"""
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An L{ITemplateLoader} that loads existing L{IRenderable} providers.
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@ivar tag: The object which will be loaded.
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@type tag: An L{IRenderable} provider.
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"""
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implements(ITemplateLoader)
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def __init__(self, tag):
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"""
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@param tag: The object which will be loaded.
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@type tag: An L{IRenderable} provider.
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"""
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self.tag = tag
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def load(self):
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return [self.tag]
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class XMLString(object):
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"""
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An L{ITemplateLoader} that loads and parses XML from a string.
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@ivar _loadedTemplate: The loaded document.
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@type _loadedTemplate: a C{list} of Stan objects.
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"""
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implements(ITemplateLoader)
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def __init__(self, s):
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"""
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Run the parser on a StringIO copy of the string.
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@param s: The string from which to load the XML.
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@type s: C{str}
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"""
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self._loadedTemplate = _flatsaxParse(StringIO(s))
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def load(self):
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"""
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Return the document.
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@return: the loaded document.
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@rtype: a C{list} of Stan objects.
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"""
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return self._loadedTemplate
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class XMLFile(object):
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"""
|
||
|
|
An L{ITemplateLoader} that loads and parses XML from a file.
|
||
|
|
|
||
|
|
@ivar _loadedTemplate: The loaded document, or C{None}, if not loaded.
|
||
|
|
@type _loadedTemplate: a C{list} of Stan objects, or C{None}.
|
||
|
|
|
||
|
|
@ivar _path: The L{FilePath}, file object, or filename that is being
|
||
|
|
loaded from.
|
||
|
|
"""
|
||
|
|
implements(ITemplateLoader)
|
||
|
|
|
||
|
|
def __init__(self, path):
|
||
|
|
"""
|
||
|
|
Run the parser on a file.
|
||
|
|
|
||
|
|
@param path: The file from which to load the XML.
|
||
|
|
@type path: L{FilePath}
|
||
|
|
"""
|
||
|
|
if not isinstance(path, FilePath):
|
||
|
|
warnings.warn(
|
||
|
|
"Passing filenames or file objects to XMLFile is deprecated "
|
||
|
|
"since Twisted 12.1. Pass a FilePath instead.",
|
||
|
|
category=DeprecationWarning, stacklevel=2)
|
||
|
|
self._loadedTemplate = None
|
||
|
|
self._path = path
|
||
|
|
|
||
|
|
|
||
|
|
def _loadDoc(self):
|
||
|
|
"""
|
||
|
|
Read and parse the XML.
|
||
|
|
|
||
|
|
@return: the loaded document.
|
||
|
|
@rtype: a C{list} of Stan objects.
|
||
|
|
"""
|
||
|
|
if not isinstance(self._path, FilePath):
|
||
|
|
return _flatsaxParse(self._path)
|
||
|
|
else:
|
||
|
|
f = self._path.open('r')
|
||
|
|
try:
|
||
|
|
return _flatsaxParse(f)
|
||
|
|
finally:
|
||
|
|
f.close()
|
||
|
|
|
||
|
|
|
||
|
|
def __repr__(self):
|
||
|
|
return '<XMLFile of %r>' % (self._path,)
|
||
|
|
|
||
|
|
|
||
|
|
def load(self):
|
||
|
|
"""
|
||
|
|
Return the document, first loading it if necessary.
|
||
|
|
|
||
|
|
@return: the loaded document.
|
||
|
|
@rtype: a C{list} of Stan objects.
|
||
|
|
"""
|
||
|
|
if self._loadedTemplate is None:
|
||
|
|
self._loadedTemplate = self._loadDoc()
|
||
|
|
return self._loadedTemplate
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
# Last updated October 2011, using W3Schools as a reference. Link:
|
||
|
|
# http://www.w3schools.com/html5/html5_reference.asp
|
||
|
|
# Note that <xmp> is explicitly omitted; its semantics do not work with
|
||
|
|
# t.w.template and it is officially deprecated.
|
||
|
|
VALID_HTML_TAG_NAMES = set([
|
||
|
|
'a', 'abbr', 'acronym', 'address', 'applet', 'area', 'article', 'aside',
|
||
|
|
'audio', 'b', 'base', 'basefont', 'bdi', 'bdo', 'big', 'blockquote',
|
||
|
|
'body', 'br', 'button', 'canvas', 'caption', 'center', 'cite', 'code',
|
||
|
|
'col', 'colgroup', 'command', 'datalist', 'dd', 'del', 'details', 'dfn',
|
||
|
|
'dir', 'div', 'dl', 'dt', 'em', 'embed', 'fieldset', 'figcaption',
|
||
|
|
'figure', 'font', 'footer', 'form', 'frame', 'frameset', 'h1', 'h2', 'h3',
|
||
|
|
'h4', 'h5', 'h6', 'head', 'header', 'hgroup', 'hr', 'html', 'i', 'iframe',
|
||
|
|
'img', 'input', 'ins', 'isindex', 'keygen', 'kbd', 'label', 'legend',
|
||
|
|
'li', 'link', 'map', 'mark', 'menu', 'meta', 'meter', 'nav', 'noframes',
|
||
|
|
'noscript', 'object', 'ol', 'optgroup', 'option', 'output', 'p', 'param',
|
||
|
|
'pre', 'progress', 'q', 'rp', 'rt', 'ruby', 's', 'samp', 'script',
|
||
|
|
'section', 'select', 'small', 'source', 'span', 'strike', 'strong',
|
||
|
|
'style', 'sub', 'summary', 'sup', 'table', 'tbody', 'td', 'textarea',
|
||
|
|
'tfoot', 'th', 'thead', 'time', 'title', 'tr', 'tt', 'u', 'ul', 'var',
|
||
|
|
'video', 'wbr',
|
||
|
|
])
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
class _TagFactory(object):
|
||
|
|
"""
|
||
|
|
A factory for L{Tag} objects; the implementation of the L{tags} object.
|
||
|
|
|
||
|
|
This allows for the syntactic convenience of C{from twisted.web.html import
|
||
|
|
tags; tags.a(href="linked-page.html")}, where 'a' can be basically any HTML
|
||
|
|
tag.
|
||
|
|
|
||
|
|
The class is not exposed publicly because you only ever need one of these,
|
||
|
|
and we already made it for you.
|
||
|
|
|
||
|
|
@see: L{tags}
|
||
|
|
"""
|
||
|
|
def __getattr__(self, tagName):
|
||
|
|
if tagName == 'transparent':
|
||
|
|
return Tag('')
|
||
|
|
# allow for E.del as E.del_
|
||
|
|
tagName = tagName.rstrip('_')
|
||
|
|
if tagName not in VALID_HTML_TAG_NAMES:
|
||
|
|
raise AttributeError('unknown tag %r' % (tagName,))
|
||
|
|
return Tag(tagName)
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
tags = _TagFactory()
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
def renderElement(request, element,
|
||
|
|
doctype='<!DOCTYPE html>', _failElement=None):
|
||
|
|
"""
|
||
|
|
Render an element or other C{IRenderable}.
|
||
|
|
|
||
|
|
@param request: The C{Request} being rendered to.
|
||
|
|
@param element: An C{IRenderable} which will be rendered.
|
||
|
|
@param doctype: A C{str} which will be written as the first line of
|
||
|
|
the request, or C{None} to disable writing of a doctype. The C{string}
|
||
|
|
should not include a trailing newline and will default to the HTML5
|
||
|
|
doctype C{'<!DOCTYPE html>'}.
|
||
|
|
|
||
|
|
@returns: NOT_DONE_YET
|
||
|
|
|
||
|
|
@since: 12.1
|
||
|
|
"""
|
||
|
|
if doctype is not None:
|
||
|
|
request.write(doctype)
|
||
|
|
request.write('\n')
|
||
|
|
|
||
|
|
if _failElement is None:
|
||
|
|
_failElement = twisted.web.util.FailureElement
|
||
|
|
|
||
|
|
d = flatten(request, element, request.write)
|
||
|
|
|
||
|
|
def eb(failure):
|
||
|
|
log.err(failure, "An error occurred while rendering the response.")
|
||
|
|
if request.site.displayTracebacks:
|
||
|
|
return flatten(request, _failElement(failure), request.write)
|
||
|
|
else:
|
||
|
|
request.write(
|
||
|
|
('<div style="font-size:800%;'
|
||
|
|
'background-color:#FFF;'
|
||
|
|
'color:#F00'
|
||
|
|
'">An error occurred while rendering the response.</div>'))
|
||
|
|
|
||
|
|
d.addErrback(eb)
|
||
|
|
d.addBoth(lambda _: request.finish())
|
||
|
|
return NOT_DONE_YET
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
from twisted.web._element import Element, renderer
|
||
|
|
from twisted.web._flatten import flatten, flattenString
|
||
|
|
import twisted.web.util
|