Speeds up font compilation by around 200%

Cython is used to compile some hot paths into native Python extensions.
These hot paths were identified through running ufocompile with the hotshot
profiler and then converting file by file to Cython, starting with the "hottest"
paths and continuing until returns were deminishing. This means that only a few
Python files were converted to Cython.

Closes #23
Closes #20 (really this time)

misc/pylib/robofab/xmlTreeBuilder.pyx

@@ -0,0 +1,116 @@
+import os
+try:
+	from xml.parsers.expat import ParserCreate
+except ImportError:
+	_haveExpat = 0
+	from xml.parsers.xmlproc.xmlproc import XMLProcessor
+else:
+	_haveExpat = 1
+
+
+class XMLParser:
+
+	def __init__(self):
+		self.root = []
+		self.current = (self.root, None)
+
+	def getRoot(self):
+		assert len(self.root) == 1
+		return self.root[0]
+
+	def startElementHandler(self, name, attrs):
+		children = []
+		self.current = (children, name, attrs, self.current)
+
+	def endElementHandler(self, name):
+		children, name, attrs, previous = self.current
+		previous[0].append((name, attrs, children))
+		self.current = previous
+
+	def characterDataHandler(self, data):
+		nodes = self.current[0]
+		if nodes and type(nodes[-1]) == type(data):
+			nodes[-1] = nodes[-1] + data
+		else:
+			nodes.append(data)
+
+	def _expatParseFile(self, pathOrFile):
+		parser = ParserCreate()
+		parser.returns_unicode = 0  # XXX, Don't remember why. It sucks, though.
+		parser.StartElementHandler = self.startElementHandler
+		parser.EndElementHandler = self.endElementHandler
+		parser.CharacterDataHandler = self.characterDataHandler
+		if isinstance(pathOrFile, (str, unicode)):
+			f = open(pathOrFile)
+			didOpen = 1
+		else:
+			didOpen = 0
+			f = pathOrFile
+		parser.ParseFile(f)
+		if didOpen:
+			f.close()
+		return self.getRoot()
+
+	def _xmlprocDataHandler(self, data, begin, end):
+		self.characterDataHandler(data[begin:end])
+
+	def _xmlprocParseFile(self, pathOrFile):
+		proc = XMLProcessor()
+		proc.app.handle_start_tag = self.startElementHandler
+		proc.app.handle_end_tag = self.endElementHandler
+		proc.app.handle_data = self._xmlprocDataHandler
+		if isinstance(pathOrFile, (str, unicode)):
+			f = open(pathOrFile)
+			didOpen = 1
+		else:
+			didOpen = 0
+			f = pathOrFile
+		proc.parseStart()
+		proc.read_from(f)
+		proc.flush()
+		proc.parseEnd()
+		proc.deref()
+		if didOpen:
+			f.close()
+		return self.getRoot()
+
+	if _haveExpat:
+		parseFile = _expatParseFile
+	else:
+		parseFile = _xmlprocParseFile
+
+
+def stripCharacterData(nodes, recursive=True):
+	i = 0
+	while 1:
+		try:
+			node = nodes[i]
+		except IndexError:
+			break
+		if isinstance(node, tuple):
+			if recursive:
+				stripCharacterData(node[2])
+			i = i + 1
+		else:
+			node = node.strip()
+			if node:
+				nodes[i] = node
+				i = i + 1
+			else:
+				del nodes[i]
+
+
+def buildTree(pathOrFile, stripData=1):
+	parser = XMLParser()
+	tree = parser.parseFile(pathOrFile)
+	if stripData:
+		stripCharacterData(tree[2])
+	return tree
+
+
+if __name__ == "__main__":
+	from pprint import pprint
+	import sys
+	strip = bool(sys.argv[2:])
+	tree = buildTree(sys.argv[1], strip)
+	pprint(tree)