def __init__(self,
node,
graph,
inherited_state=None,
base="",
options=None,
rdfa_version=None):
"""
@param node: the current DOM Node
@param graph: the RDFLib Graph
@keyword inherited_state: the state as inherited
from upper layers. This inherited_state is mixed with the state information
retrieved from the current node.
@type inherited_state: L{state.ExecutionContext}
@keyword base: string denoting the base URI for the specific node. This overrides the possible
base inherited from the upper layers. The
current XHTML+RDFa syntax does not allow the usage of C{@xml:base}, but SVG1.2 does, so this is
necessary for SVG (and other possible XML dialects that accept C{@xml:base})
@keyword options: invocation options, and references to warning graphs
@type options: L{Options<pyRdfa.options>}
"""
def remove_frag_id(uri):
"""
The fragment ID for self.base must be removed
"""
try:
# To be on the safe side:-)
t = urlparse(uri)
return urlunparse((t[0], t[1], t[2], t[3], t[4], ""))
except:
return uri
# This is, conceptually, an additional class initialization, but it must be done run time, otherwise import errors show up
if len(ExecutionContext._resource_type) == 0:
ExecutionContext._resource_type = {
"href": ExecutionContext._URI,
"src": ExecutionContext._URI,
"vocab": ExecutionContext._URI,
"about": ExecutionContext._CURIEorURI,
"resource": ExecutionContext._CURIEorURI,
"rel": ExecutionContext._TERMorCURIEorAbsURI,
"rev": ExecutionContext._TERMorCURIEorAbsURI,
"datatype": ExecutionContext._TERMorCURIEorAbsURI,
"typeof": ExecutionContext._TERMorCURIEorAbsURI,
"property": ExecutionContext._TERMorCURIEorAbsURI,
"role": ExecutionContext._TERMorCURIEorAbsURI,
}
#-----------------------------------------------------------------
self.node = node
#-----------------------------------------------------------------
# Settling the base. In a generic XML, xml:base should be accepted at all levels (though this is not the
# case in, say, XHTML...)
# At the moment, it is invoked with a 'None' at the top level of parsing, that is
# when the <base> element is looked for (for the HTML cases, that is)
if inherited_state:
self.rdfa_version = inherited_state.rdfa_version
self.base = inherited_state.base
self.options = inherited_state.options
self.list_mapping = inherited_state.list_mapping
self.new_list = False
# for generic XML versions the xml:base attribute should be handled
if self.options.host_language in accept_xml_base and node.hasAttribute(
"xml:base"):
self.base = remove_frag_id(node.getAttribute("xml:base"))
else:
# this is the branch called from the very top
self.list_mapping = ListStructure()
self.new_list = True
if rdfa_version is not None:
self.rdfa_version = rdfa_version
else:
from pyRdfa import rdfa_current_version
self.rdfa_version = rdfa_current_version
# This value can be overwritten by a @version attribute
if node.hasAttribute("version"):
top_version = node.getAttribute("version")
if top_version.find("RDFa 1.0") != -1 or top_version.find(
"RDFa1.0") != -1:
self.rdfa_version = "1.0"
elif top_version.find("RDFa 1.1") != -1 or top_version.find(
"RDFa1.1") != -1:
self.rdfa_version = "1.1"
# this is just to play safe. I believe this should actually not happen...
if options == None:
from pyRdfa import Options
self.options = Options()
else:
self.options = options
self.base = ""
# handle the base element case for HTML
if self.options.host_language in [
HostLanguage.xhtml, HostLanguage.html5, HostLanguage.xhtml5
]:
for bases in node.getElementsByTagName("base"):
if bases.hasAttribute("href"):
self.base = remove_frag_id(bases.getAttribute("href"))
continue
elif self.options.host_language in accept_xml_base and node.hasAttribute(
"xml:base"):
self.base = remove_frag_id(node.getAttribute("xml:base"))
# If no local setting for base occurs, the input argument has it
if self.base == "":
self.base = base
# Perform an extra beautification in RDFLib
if self.options.host_language in beautifying_prefixes:
dict = beautifying_prefixes[self.options.host_language]
for key in dict:
graph.bind(key, dict[key])
input_info = "Input Host Language:%s, RDFa version:%s, base:%s" % (
self.options.host_language, self.rdfa_version, self.base)
self.options.add_info(input_info)
#-----------------------------------------------------------------
# this will be used repeatedly, better store it once and for all...
self.parsedBase = urlsplit(self.base)
#-----------------------------------------------------------------
# generate and store the local CURIE handling class instance
self.term_or_curie = TermOrCurie(self, graph, inherited_state)
#-----------------------------------------------------------------
# Settling the language tags
# @lang has priority over @xml:lang
# it is a bit messy: the three fundamental modes (xhtml, html, or xml) are all slightly different:-(
# first get the inherited state's language, if any
if inherited_state:
self.lang = inherited_state.lang
else:
self.lang = None
self.supress_lang = False
if self.options.host_language in [
HostLanguage.xhtml, HostLanguage.xhtml5, HostLanguage.html5
]:
# we may have lang and xml:lang
if node.hasAttribute("lang"):
lang = node.getAttribute("lang").lower()
else:
lang = None
if node.hasAttribute("xml:lang"):
xmllang = node.getAttribute("xml:lang").lower()
else:
xmllang = None
# First of all, set the value, if any
if xmllang != None:
# this has priority
if len(xmllang) != 0:
self.lang = xmllang
else:
self.lang = None
elif lang != None:
if len(lang) != 0:
self.lang = lang
else:
self.lang = None
# Ideally, a warning should be generated if lang and xmllang are both present with different values. But
# the HTML5 Parser does its magic by overriding a lang value if xmllang is present, so the potential
# error situations are simply swallowed...
elif self.options.host_language in accept_xml_lang and node.hasAttribute(
"xml:lang"):
self.lang = node.getAttribute("xml:lang").lower()
if len(self.lang) == 0: self.lang = None
#-----------------------------------------------------------------
# Set the default namespace. Used when generating XML Literals
if node.hasAttribute("xmlns"):
self.defaultNS = node.getAttribute("xmlns")
elif inherited_state and inherited_state.defaultNS != None:
self.defaultNS = inherited_state.defaultNS
else:
self.defaultNS = None
