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#!/usr/bin/env python
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from optparse import OptionParser
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from xml.sax import parseString
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from xml.sax.handler import ContentHandler
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from sys import exit
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def die(msg):
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print msg
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exit(1)
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class ClassesDefContentHandler(ContentHandler):
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def __init__(self):
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self.classes = []
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self.headers = []
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def startElement(self, name, attrs):
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# <*> is used to indicate "whatever specified in classes.h" which obviously
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# in this case does not work anymore, because we want to generate such a
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# file. Therefore we exit with an error.
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#
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# If a class has argument "concrete", classes_def.xml declaration is enough
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# to generate the dictionary and we do not need to create an instance in
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# classes.h.
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if name == "class":
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if "pattern" in attrs:
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die("Cannot use pattern '%s': please declare actual class names to use automatic classes.h generation." % attrs["pattern"])
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if "type" in attrs and attrs["type"] == "concrete":
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return
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self.classes.append(attrs["name"])
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if name == "include":
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if "file" in attrs:
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self.headers.append("\"" + attrs["file"] + "\"")
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elif "system" in attrs:
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self.headers.append("<"+attrs["system"] + ">")
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else:
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die("Malformed classes_def.xml")
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def endDocument(self):
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print "\n".join("#include %s" % x for x in self.headers)
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if self.headers: print ""
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print "namespace {\n struct dictionary {"
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print "\n".join(" %s a%s;" % (n, i) for (i,n) in enumerate(self.classes))
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print "};\n}"
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if __name__ == "__main__":
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parser = OptionParser(usage="%{progname}s <classes_def.xml>")
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opts, args = parser.parse_args()
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if not args:
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parser.error("Please specify the input <classes_def.xml>")
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if len(args) > 1:
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parser.error("Too many input files specified")
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# Replace any occurence of <>& in the attribute values by the xml parameter
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rxml, nxml = file(args[0]).read(), ''
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q1,q2 = 0,0
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for c in rxml :
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if (q1 or q2) and c == '<' : nxml += '<'
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elif (q1 or q2) and c == '>' : nxml += '>'
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# elif (q1 or q2) and c == '&' : nxml += '&'
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else : nxml += c
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if c == '"' : q1 = not q1
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if c == "'" : q2 = not q2
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parseString(nxml, ClassesDefContentHandler())
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