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python/packages/html5lib/treewalkers/_base.py

@@ -0,0 +1,176 @@
+import gettext
+_ = gettext.gettext
+
+from html5lib.constants import voidElements, spaceCharacters
+spaceCharacters = u"".join(spaceCharacters)
+
+class TreeWalker(object):
+    def __init__(self, tree):
+        self.tree = tree
+
+    def __iter__(self):
+        raise NotImplementedError
+
+    def error(self, msg):
+        return {"type": "SerializeError", "data": msg}
+
+    def normalizeAttrs(self, attrs):
+        newattrs = {}
+        if attrs:
+            #TODO: treewalkers should always have attrs
+            for (namespace,name),value in attrs.iteritems():
+                namespace = unicode(namespace) if namespace else None
+                name = unicode(name)
+                value = unicode(value)
+                newattrs[(namespace,name)] = value
+        return newattrs
+
+    def emptyTag(self, namespace, name, attrs, hasChildren=False):
+        yield {"type": "EmptyTag", "name": unicode(name), 
+               "namespace":unicode(namespace),
+               "data": self.normalizeAttrs(attrs)}
+        if hasChildren:
+            yield self.error(_("Void element has children"))
+
+    def startTag(self, namespace, name, attrs):
+        return {"type": "StartTag", 
+                "name": unicode(name),
+                "namespace":unicode(namespace),
+                "data": self.normalizeAttrs(attrs)}
+
+    def endTag(self, namespace, name):
+        return {"type": "EndTag", 
+                "name": unicode(name),
+                "namespace":unicode(namespace),
+                "data": {}}
+
+    def text(self, data):
+        data = unicode(data)
+        middle = data.lstrip(spaceCharacters)
+        left = data[:len(data)-len(middle)]
+        if left:
+            yield {"type": "SpaceCharacters", "data": left}
+        data = middle
+        middle = data.rstrip(spaceCharacters)
+        right = data[len(middle):]
+        if middle:
+            yield {"type": "Characters", "data": middle}
+        if right:
+            yield {"type": "SpaceCharacters", "data": right}
+
+    def comment(self, data):
+        return {"type": "Comment", "data": unicode(data)}
+
+    def doctype(self, name, publicId=None, systemId=None, correct=True):
+        return {"type": "Doctype",
+                "name": name is not None and unicode(name) or u"",
+                "publicId": publicId,
+                "systemId": systemId,
+                "correct": correct}
+
+    def entity(self, name):
+        return {"type": "Entity", "name": unicode(name)}
+
+    def unknown(self, nodeType):
+        return self.error(_("Unknown node type: ") + nodeType)
+
+class RecursiveTreeWalker(TreeWalker):
+    def walkChildren(self, node):
+        raise NodeImplementedError
+
+    def element(self, node, namespace, name, attrs, hasChildren):
+        if name in voidElements:
+            for token in self.emptyTag(namespace, name, attrs, hasChildren):
+                yield token
+        else:
+            yield self.startTag(name, attrs)
+            if hasChildren:
+                for token in self.walkChildren(node):
+                    yield token
+            yield self.endTag(name)
+
+from xml.dom import Node
+
+DOCUMENT = Node.DOCUMENT_NODE
+DOCTYPE = Node.DOCUMENT_TYPE_NODE
+TEXT = Node.TEXT_NODE
+ELEMENT = Node.ELEMENT_NODE
+COMMENT = Node.COMMENT_NODE
+ENTITY = Node.ENTITY_NODE
+UNKNOWN = "<#UNKNOWN#>"
+
+class NonRecursiveTreeWalker(TreeWalker):
+    def getNodeDetails(self, node):
+        raise NotImplementedError
+    
+    def getFirstChild(self, node):
+        raise NotImplementedError
+    
+    def getNextSibling(self, node):
+        raise NotImplementedError
+    
+    def getParentNode(self, node):
+        raise NotImplementedError
+
+    def __iter__(self):
+        currentNode = self.tree
+        while currentNode is not None:
+            details = self.getNodeDetails(currentNode)
+            type, details = details[0], details[1:]
+            hasChildren = False
+            endTag = None
+
+            if type == DOCTYPE:
+                yield self.doctype(*details)
+
+            elif type == TEXT:
+                for token in self.text(*details):
+                    yield token
+
+            elif type == ELEMENT:
+                namespace, name, attributes, hasChildren = details
+                if name in voidElements:
+                    for token in self.emptyTag(namespace, name, attributes, 
+                                               hasChildren):
+                        yield token
+                    hasChildren = False
+                else:
+                    endTag = name
+                    yield self.startTag(namespace, name, attributes)
+
+            elif type == COMMENT:
+                yield self.comment(details[0])
+
+            elif type == ENTITY:
+                yield self.entity(details[0])
+
+            elif type == DOCUMENT:
+                hasChildren = True
+
+            else:
+                yield self.unknown(details[0])
+            
+            if hasChildren:
+                firstChild = self.getFirstChild(currentNode)
+            else:
+                firstChild = None
+            
+            if firstChild is not None:
+                currentNode = firstChild
+            else:
+                while currentNode is not None:
+                    details = self.getNodeDetails(currentNode)
+                    type, details = details[0], details[1:]
+                    if type == ELEMENT:
+                        namespace, name, attributes, hasChildren = details
+                        if name not in voidElements:
+                            yield self.endTag(namespace, name)
+                    if self.tree is currentNode:
+                        currentNode = None
+                        break
+                    nextSibling = self.getNextSibling(currentNode)
+                    if nextSibling is not None:
+                        currentNode = nextSibling
+                        break
+                    else:
+                        currentNode = self.getParentNode(currentNode)