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########################################################################
#
# File Name: HtmlSax.py
#
#
#
"""
Components for reading HTML files from a SAX-like producer.
WWW: http://4suite.com/4DOM e-mail: support@4suite.com
Copyright (c) 2000 Fourthought Inc, USA. All Rights Reserved.
See http://4suite.com/COPYRIGHT for license and copyright information
"""
import sys, string, cStringIO
import xml.dom.ext
from xml.dom import Node
from xml.dom import implementation
class HtmlDomGenerator:
def __init__(self, keepAllWs=0):
self._keepAllWs = keepAllWs
def initState(self, ownerDoc=None):
"""
If None is passed in as the doc, set up an empty document to act
as owner and also add all elements to this document
"""
if ownerDoc == None:
self._ownerDoc = implementation.createHTMLDocument('')
de = self._ownerDoc.documentElement
self._ownerDoc.removeChild(de)
xml.dom.ext.ReleaseNode(de)
self._rootNode = self._ownerDoc
else:
self._ownerDoc = ownerDoc
#Create a docfrag to hold all the generated nodes.
self._rootNode = self._ownerDoc.createDocumentFragment()
#Set up the stack which keeps track of the nesting of DOM nodes.
self._nodeStack = []
self._nodeStack.append(self._rootNode)
self._currText = ''
return
def getRootNode(self):
self._completeTextNode()
return self._rootNode
def _completeTextNode(self):
if self._currText:
new_text = self._ownerDoc.createTextNode(self._currText)
self._nodeStack[-1].appendChild(new_text)
self._currText = ''
#Overridden DocumentHandler methods
def startElement(self, name, attribs):
self._completeTextNode()
new_element = self._ownerDoc.createElement(name)
for curr_attrib_key in attribs.keys():
new_element.setAttribute(curr_attrib_key, attribs[curr_attrib_key])
self._nodeStack.append(new_element)
def endElement(self, name):
self._completeTextNode()
new_element = self._nodeStack[-1]
del self._nodeStack[-1]
self._nodeStack[-1].appendChild(new_element)
def ignorableWhitespace(self, ch, start, length):
"""
If 'keepAllWs' permits, add ignorable white-space as a text node.
Remember that a Document node cannot contain text nodes directly.
If the white-space occurs outside the root element, there is no place
for it in the DOM and it must be discarded.
"""
if self._keepAllWs and self._nodeStack[-1].nodeType != Node.DOCUMENT_NODE:
self._currText = self._currText + ch[start:start+length]
def characters(self, ch, start, length):
self._currText = self._currText + ch[start:start+length]
#Overridden ErrorHandler methods
#def warning(self, exception):
# raise exception
def error(self, exception):
raise exception
def fatalError(self, exception):
raise exception
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