/usr/share/pyshared/wsgi_intercept/webunit_intercept/SimpleDOM.py is in python-wsgi-intercept 0.4-0ubuntu3.
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# Copyright (c) 2003 Richard Jones (http://mechanicalcat.net/richard)
# Copyright (c) 2002 ekit.com Inc (http://www.ekit-inc.com/)
# Copyright (c) 2001 Bizar Software Pty Ltd (http://www.bizarsoftware.com.au/)
#
# See the README for full license details.
#
# HISTORY:
# This code is heavily based on the TAL parsing code from the Zope Page
# Templates effort at www.zope.org. No copyright or license accompanied
# that code.
#
# $Id: SimpleDOM.py,v 1.6 2004/01/21 22:50:09 richard Exp $
'''A Simple DOM parser
Simple usage:
>>> import SimpleDOM
>>> parser = SimpleDOM.SimpleDOMParser()
>>> parser.parseString("""<html><head><title>My Document</title></head>
... <body>
... <p>This is a paragraph!!!</p>
... <p>This is another para!!</p>
... </body>
... </html>""")
>>> dom = parser.getDOM()
>>> dom.getByName('p')
[<SimpleDOMNode "p" {} (1 elements)>, <SimpleDOMNode "p" {} (1 elements)>]
>>> dom.getByName('p')[0][0]
'This is a paragraph!!!'
>>> dom.getByName('title')[0][0]
'My Document'
'''
import sys, string
# NOTE this is using a modified HTMLParser
from HTMLParser import HTMLParser, HTMLParseError
from utility import Upload
BOOLEAN_HTML_ATTRS = [
# List of Boolean attributes in HTML that may be given in
# minimized form (e.g. <img ismap> rather than <img ismap="">)
# From http://www.w3.org/TR/xhtml1/#guidelines (C.10)
"compact", "nowrap", "ismap", "declare", "noshade", "checked",
"disabled", "readonly", "multiple", "selected", "noresize",
"defer"
]
EMPTY_HTML_TAGS = [
# List of HTML tags with an empty content model; these are
# rendered in minimized form, e.g. <img />.
# From http://www.w3.org/TR/xhtml1/#dtds
"base", "meta", "link", "hr", "br", "param", "img", "area",
"input", "col", "basefont", "isindex", "frame",
]
PARA_LEVEL_HTML_TAGS = [
# List of HTML elements that close open paragraph-level elements
# and are themselves paragraph-level.
"h1", "h2", "h3", "h4", "h5", "h6", "p",
]
BLOCK_CLOSING_TAG_MAP = {
"tr": ("tr", "td", "th"),
"td": ("td", "th"),
"th": ("td", "th"),
"li": ("li",),
"dd": ("dd", "dt"),
"dt": ("dd", "dt"),
"option": ("option",),
}
BLOCK_LEVEL_HTML_TAGS = [
# List of HTML tags that denote larger sections than paragraphs.
"blockquote", "table", "tr", "th", "td", "thead", "tfoot", "tbody",
"noframe", "div", "form", "font", "p",
"ul", "ol", "li", "dl", "dt", "dd",
]
class NestingError(HTMLParseError):
"""Exception raised when elements aren't properly nested."""
def __init__(self, tagstack, endtag, position=(None, None)):
self.endtag = endtag
if tagstack:
if len(tagstack) == 1:
msg = ('Open tag <%s> does not match close tag </%s>'
% (tagstack[0], endtag))
else:
msg = ('Open tags <%s> do not match close tag </%s>'
% (string.join(tagstack, '>, <'), endtag))
else:
msg = 'No tags are open to match </%s>' % endtag
HTMLParseError.__init__(self, msg, position)
class EmptyTagError(NestingError):
"""Exception raised when empty elements have an end tag."""
def __init__(self, tag, position=(None, None)):
self.tag = tag
msg = 'Close tag </%s> should be removed' % tag
HTMLParseError.__init__(self, msg, position)
_marker=[]
class SimpleDOMNode:
'''Simple class that represents a tag in a HTML document. The node may
have contents which are represented as a sequence of tags or strings
of text.
node.name -- get the "name" attribute
node[N] -- get the Nth entry in the contents list
len(node) -- number of sub-content objects
'''
def __init__(self, name, attributes, contents):
self.__dict__['__name'] = name
self.__dict__['__attributes'] = attributes
self.__dict__['__contents'] = contents
def getByName(self, name, r=None):
'''Return all nodes of type "name" from the contents of this DOM
using a depth-first search.
'''
if r is None:
r = []
for entry in self.getContents():
if isinstance(entry, SimpleDOMNode):
if entry.__dict__['__name'] == name:
r.append(entry)
entry.getByName(name, r)
return r
def getById(self, name, id):
'''Return all nodes of type "name" from the contents of this DOM
using a depth-first search.
'''
l = self.getByName(name)
for entry in l:
if hasattr(entry, 'id') and entry.id == id:
return entry
raise ValueError, 'No %r with id %r'%(name, id)
def getByNameFlat(self, name):
'''Return all nodes of type "name" from the contents of this node.
NON-RECURSIVE.
'''
r = []
for entry in self.getContents():
if isinstance(entry, SimpleDOMNode):
if entry.__dict__['__name'] == name:
r.append(entry)
return r
def getPath(self, path):
'''Return all nodes of type "name" from the contents of this node.
NON-RECURSIVE.
'''
current = self
for name, count in path:
for entry in current.getContents():
if isinstance(entry, SimpleDOMNode) and \
entry.__dict__['__name'] == name:
if not count:
current = entry
break
count -= 1
return current
def hasChildNodes(self):
'''Determine if the Node has any content nodes (rather than just text).
'''
for entry in self.getContents():
if isinstance(entry, SimpleDOMNode):
return 1
return 0
def getContents(self):
return self.__dict__['__contents']
def __getitem__(self, item):
return self.getContents()[item]
def hasattr(self, attr):
return self.__dict__['__attributes'].has_key(attr)
def getattr(self, attr, default=_marker):
if self.__dict__['__attributes'].has_key(attr):
return self.__dict__['__attributes'][attr]
if default is _marker:
raise AttributeError, attr
return default
def __getattr__(self, attr):
if self.__dict__['__attributes'].has_key(attr):
return self.__dict__['__attributes'][attr]
if self.__dict__.has_key(attr):
return self.__dict__[attr]
raise AttributeError, attr
def __len__(self):
return len(self.getContents())
def getContentString(self):
s = ''
for content in self.getContents():
s = s + str(content)
return s
def __str__(self):
attrs = []
for attr in self.__dict__['__attributes'].items():
if attr[0] in BOOLEAN_HTML_ATTRS:
attrs.append(attr[0])
else:
attrs.append('%s="%s"'%attr)
if attrs:
s = '<%s %s>'%(self.__dict__['__name'], ' '.join(attrs))
else:
s = '<%s>'%self.__dict__['__name']
s = s + self.getContentString()
if self.__dict__['__name'] in EMPTY_HTML_TAGS:
return s
else:
return s + '</%s>'%self.__dict__['__name']
def __repr__(self):
return '<SimpleDOMNode "%s" %s (%s elements)>'%(self.__dict__['__name'],
self.__dict__['__attributes'], len(self.getContents()))
def extractElements(self, path=[], include_submit=0, include_button=0):
''' Pull a form's elements out of the document given the path to the
form.
For most elements, the returned dictionary has a key:value pair
holding the input elements name and value.
For radio, checkboxes and selects, the value is a dictionary
holding:
value or name: 'selected' (note: not 'checked')
where the value of the input/option is used but if not
present then the name is used.
'''
form = self
for name, element in path:
form = form.getByName(name)[element]
elements = {}
submits = 0
buttons = 0
for input in form.getByName('input'):
if not hasattr(input, 'type'):
elements[input.name] = input.getattr('value', '')
elif input.type == 'image':
continue
elif input.type == 'button' and not include_button:
continue
elif input.type == 'submit' and not include_submit:
continue
elif input.type == 'file':
elements[input.name] = Upload('')
elif input.type in ['checkbox', 'radio']:
l = elements.setdefault(input.name, {})
key = input.hasattr('value') and input.value or input.name
if input.hasattr('checked'):
l[key] = 'selected'
else:
l[key] = ''
elif input.type == 'submit':
name = input.getattr('name', 'submit')
if name == 'submit':
name = 'submit%s'%str(submits)
submits = submits + 1
elements[name] = input.getattr('value', '')
elif input.type == 'button':
name = input.getattr('name', 'button')
if name == 'button':
name = 'button%s'%str(buttons)
buttons = buttons + 1
elements[name] = input.getattr('value', '')
else:
elements[input.name] = input.getattr('value', '')
for textarea in form.getByName('textarea'):
if len(textarea):
elements[textarea.name] = textarea.getContentString()
else:
elements[textarea.name] = ''
for input in form.getByName('select'):
options = input.getByName('option')
d = elements[input.name] = {}
selected = first = None
for option in options:
if option.hasattr('value'):
key = option.value
elif len(option) > 0:
key = option[0]
else:
continue
if first is None:
first = key
if option.hasattr('selected'):
d[key] = 'selected'
selected = 1
else: d[key] = ''
if ((not input.hasattr('size') or input.size == 1)
and selected is None and first is not None):
d[first] = 'selected'
return elements
class SimpleDOMParser(HTMLParser):
def __init__(self, debug=0):
HTMLParser.__init__(self)
self.tagstack = []
self.__debug = debug
# DOM stuff
self.content = self.dom = []
self.stack = []
def parseFile(self, file):
f = open(file)
data = f.read()
f.close()
self.parseString(data)
def parseString(self, data):
self.feed(data)
self.close()
while self.tagstack:
self.implied_endtag(self.tagstack[-1], 2)
def getDOM(self):
return SimpleDOMNode('The Document', {}, self.dom)
# Overriding HTMLParser methods
def handle_starttag(self, tag, attrs):
if self.__debug:
print '\n>handle_starttag', tag
print self.tagstack
self.close_para_tags(tag)
self.tagstack.append(tag)
d = {}
for k, v in attrs:
d[string.lower(k)] = v
self.emitStartElement(tag, d)
if tag in EMPTY_HTML_TAGS:
self.implied_endtag(tag, -1)
def handle_startendtag(self, tag, attrs):
if self.__debug:
print '><handle_startendtag', tag
print self.tagstack
self.close_para_tags(tag)
d = {}
for k, v in attrs:
d[string.lower(k)] = v
self.emitStartElement(tag, d, isend=1)
def handle_endtag(self, tag):
if self.__debug:
print '<handle_endtag', tag
print self.tagstack
if tag in EMPTY_HTML_TAGS:
# </img> etc. in the source is an error
raise EmptyTagError(tag, self.getpos())
self.close_enclosed_tags(tag)
self.emitEndElement(tag)
self.tagstack.pop()
def close_para_tags(self, tag):
if tag in EMPTY_HTML_TAGS:
return
close_to = -1
if BLOCK_CLOSING_TAG_MAP.has_key(tag):
blocks_to_close = BLOCK_CLOSING_TAG_MAP[tag]
for i in range(len(self.tagstack)):
t = self.tagstack[i]
if t in blocks_to_close:
if close_to == -1:
close_to = i
elif t in BLOCK_LEVEL_HTML_TAGS:
close_to = -1
elif tag in PARA_LEVEL_HTML_TAGS + BLOCK_LEVEL_HTML_TAGS:
for i in range(len(self.tagstack)):
if self.tagstack[i] in BLOCK_LEVEL_HTML_TAGS:
close_to = -1
elif self.tagstack[i] in PARA_LEVEL_HTML_TAGS:
if close_to == -1:
close_to = i
if close_to >= 0:
while len(self.tagstack) > close_to:
self.implied_endtag(self.tagstack[-1], 1)
def close_enclosed_tags(self, tag):
if tag not in self.tagstack:
raise NestingError(self.tagstack, tag, self.getpos())
while tag != self.tagstack[-1]:
self.implied_endtag(self.tagstack[-1], 1)
assert self.tagstack[-1] == tag
def implied_endtag(self, tag, implied):
if self.__debug:
print '<implied_endtag', tag, implied
print self.tagstack
assert tag == self.tagstack[-1]
assert implied in (-1, 1, 2)
isend = (implied < 0)
self.emitEndElement(tag, isend=isend, implied=implied)
self.tagstack.pop()
def handle_charref(self, name):
self.emitText("&#%s;" % name)
def handle_entityref(self, name):
self.emitText("&%s;" % name)
def handle_data(self, data):
self.emitText(data)
def handle_comment(self, data):
self.emitText("<!--%s-->" % data)
def handle_decl(self, data):
self.emitText("<!%s>" % data)
def handle_pi(self, data):
self.emitText("<?%s>" % data)
def emitStartTag(self, name, attrlist, isend=0):
if isend:
if self.__debug: print '*** content'
self.content.append(SimpleDOMNode(name, attrlist, []))
else:
# generate a new scope and push the current one on the stack
if self.__debug: print '*** push'
newcontent = []
self.stack.append(self.content)
self.content.append(SimpleDOMNode(name, attrlist, newcontent))
self.content = newcontent
def emitEndTag(self, name):
if self.__debug: print '*** pop'
self.content = self.stack.pop()
def emitText(self, text):
self.content.append(text)
def emitStartElement(self, name, attrlist, isend=0):
# Handle the simple, common case
self.emitStartTag(name, attrlist, isend)
if isend:
self.emitEndElement(name, isend)
def emitEndElement(self, name, isend=0, implied=0):
if not isend or implied:
self.emitEndTag(name)
if __name__ == '__main__':
tester = SimpleDOMParser(debug=0)
tester.parseFile('/tmp/test.html')
dom = tester.getDOM()
# html = dom.getByNameFlat('html')[0]
# body = html.getByNameFlat('body')[0]
# table = body.getByNameFlat('table')[0]
# tr = table.getByNameFlat('tr')[1]
# td = tr.getByNameFlat('td')[2]
# print td
import pprint;pprint.pprint(dom)
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