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Diffstat (limited to 'trunk/qpid/python/mllib/dom.py')
| -rw-r--r-- | trunk/qpid/python/mllib/dom.py | 295 |
1 files changed, 0 insertions, 295 deletions
diff --git a/trunk/qpid/python/mllib/dom.py b/trunk/qpid/python/mllib/dom.py deleted file mode 100644 index df2b88322a..0000000000 --- a/trunk/qpid/python/mllib/dom.py +++ /dev/null @@ -1,295 +0,0 @@ -# -# 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 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 |