/usr/share/pyshared/mllib/dom.py is in python-qpid 0.22+dfsg-1.
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# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements. See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License. You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied. See the License for the
# specific language governing permissions and limitations
# under the License.
#
"""
Simple DOM for both SGML and XML documents.
"""
from __future__ import division
from __future__ import generators
from __future__ import nested_scopes
import transforms
class Container:
def __init__(self):
self.children = []
def add(self, child):
child.parent = self
self.children.append(child)
def extend(self, children):
for child in children:
child.parent = self
self.children.append(child)
class Component:
def __init__(self):
self.parent = None
def index(self):
if self.parent:
return self.parent.children.index(self)
else:
return 0
def _line(self, file, line, column):
self.file = file
self.line = line
self.column = column
class DispatchError(Exception):
def __init__(self, scope, f):
msg = "no such attribtue"
class Dispatcher:
def is_type(self, type):
cls = self
while cls != None:
if cls.type == type:
return True
cls = cls.base
return False
def dispatch(self, f, attrs = ""):
cls = self
while cls != None:
if hasattr(f, cls.type):
return getattr(f, cls.type)(self)
else:
cls = cls.base
cls = self
while cls != None:
if attrs:
sep = ", "
if cls.base == None:
sep += "or "
else:
sep = ""
attrs += "%s'%s'" % (sep, cls.type)
cls = cls.base
raise AttributeError("'%s' object has no attribute %s" %
(f.__class__.__name__, attrs))
class Node(Container, Component, Dispatcher):
type = "node"
base = None
def __init__(self):
Container.__init__(self)
Component.__init__(self)
self.query = Query([self])
def __getitem__(self, name):
for nd in self.query[name]:
return nd
def text(self):
return self.dispatch(transforms.Text())
def tag(self, name, *attrs, **kwargs):
t = Tag(name, *attrs, **kwargs)
self.add(t)
return t
def data(self, s):
d = Data(s)
self.add(d)
return d
def entity(self, s):
e = Entity(s)
self.add(e)
return e
class Tree(Node):
type = "tree"
base = Node
class Tag(Node):
type = "tag"
base = Node
def __init__(self, _name, *attrs, **kwargs):
Node.__init__(self)
self.name = _name
self.attrs = list(attrs)
self.attrs.extend(kwargs.items())
self.singleton = False
def get_attr(self, name):
for k, v in self.attrs:
if name == k:
return v
def _idx(self, attr):
idx = 0
for k, v in self.attrs:
if k == attr:
return idx
idx += 1
return None
def set_attr(self, name, value):
idx = self._idx(name)
if idx is None:
self.attrs.append((name, value))
else:
self.attrs[idx] = (name, value)
def dispatch(self, f):
try:
attr = "do_" + self.name
method = getattr(f, attr)
except AttributeError:
return Dispatcher.dispatch(self, f, "'%s'" % attr)
return method(self)
class Leaf(Component, Dispatcher):
type = "leaf"
base = None
def __init__(self, data):
assert isinstance(data, basestring)
self.data = data
class Data(Leaf):
type = "data"
base = Leaf
class Entity(Leaf):
type = "entity"
base = Leaf
class Character(Leaf):
type = "character"
base = Leaf
class Comment(Leaf):
type = "comment"
base = Leaf
###################
## Query Classes ##
###########################################################################
class Adder:
def __add__(self, other):
return Sum(self, other)
class Sum(Adder):
def __init__(self, left, right):
self.left = left
self.right = right
def __iter__(self):
for x in self.left:
yield x
for x in self.right:
yield x
class View(Adder):
def __init__(self, source):
self.source = source
class Filter(View):
def __init__(self, predicate, source):
View.__init__(self, source)
self.predicate = predicate
def __iter__(self):
for nd in self.source:
if self.predicate(nd): yield nd
class Flatten(View):
def __iter__(self):
sources = [iter(self.source)]
while sources:
try:
nd = sources[-1].next()
if isinstance(nd, Tree):
sources.append(iter(nd.children))
else:
yield nd
except StopIteration:
sources.pop()
class Children(View):
def __iter__(self):
for nd in self.source:
for child in nd.children:
yield child
class Attributes(View):
def __iter__(self):
for nd in self.source:
for a in nd.attrs:
yield a
class Values(View):
def __iter__(self):
for name, value in self.source:
yield value
def flatten_path(path):
if isinstance(path, basestring):
for part in path.split("/"):
yield part
elif callable(path):
yield path
else:
for p in path:
for fp in flatten_path(p):
yield fp
class Query(View):
def __iter__(self):
for nd in self.source:
yield nd
def __getitem__(self, path):
query = self.source
for p in flatten_path(path):
if callable(p):
select = Query
pred = p
source = query
elif isinstance(p, basestring):
if p[0] == "@":
select = Values
pred = lambda x, n=p[1:]: x[0] == n
source = Attributes(query)
elif p[0] == "#":
select = Query
pred = lambda x, t=p[1:]: x.is_type(t)
source = Children(query)
else:
select = Query
pred = lambda x, n=p: isinstance(x, Tag) and x.name == n
source = Flatten(Children(query))
else:
raise ValueError(p)
query = select(Filter(pred, source))
return query
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