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xmlapi.py
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xmlapi.py
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#!/usr/bin/python
# Copyright (C) 2014 Reece H. Dunn
#
# This file is part of documentation-generator.
#
# documentation-generator is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# documentation-generator is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with documentation-generator. If not, see <http://www.gnu.org/licenses/>.
import os
import sys
import re
from xml.dom import minidom
class NodeSelector:
def __init__(self, name):
self.typename = 'node'
self.name = name
def __repr__(self):
return 'Node(%s)' % self.name
def select(self, item):
for node in item.children():
if node.name == self.name:
yield node
class AttributeSelector:
def __init__(self, name):
self.typename = 'attribute'
self.name = name
def __repr__(self):
return 'Attr(%s)' % self.name
def select(self, item):
if item.node.attributes:
ret = item.node.attributes.get(self.name, None)
if ret:
yield ret.value
class TextSelector:
def __init__(self):
self.typename = 'text()'
def __repr__(self):
return 'text()'
def select(self, item):
yield ''.join(self._text(item.node))
def _text(self, node):
ret = []
for child in node.childNodes:
if child.nodeType == child.TEXT_NODE:
ret.append(child.nodeValue)
elif child.nodeType == child.ELEMENT_NODE:
ret.extend(self._text(child))
return ret
class EqualsSelector:
def __init__(self, selector, value):
self.typename = 'equals'
self.selector = selector
self.value = value
def __repr__(self):
return 'Equals(%s,%s)' % (self.selector, self.value)
def select(self, item):
for value in self.selector.select(item):
if value == self.value:
yield value
class IfSelector:
def __init__(self, node, selector):
self.typename = 'when'
self.node = node
self.selector = selector
def __repr__(self):
return '%s.If(%s)' % (self.node, self.selector)
def select(self, item):
for node in self.node.select(item):
for value in self.selector.select(node):
yield node
class ChildSelector:
def __init__(self, node, selector):
self.typename = 'child'
self.node = node
self.selector = selector
def __repr__(self):
return '%s.Select(%s)' % (self.node, self.selector)
def select(self, item):
for node in self.node.select(item):
for match in self.selector.select(node):
yield match
_tokens = [
(re.compile(r'text\(\)'), 'text()'),
(re.compile(r'[a-zA-Z0-9\_]+'), 'name'),
(re.compile(r'"[^"]*"'), 'string'),
(re.compile(r'\['), '['),
(re.compile(r'\]'), ']'),
(re.compile(r'@'), '@'),
(re.compile(r'='), '='),
(re.compile(r'/'), '/'),
]
def match_token(text, pos):
for matcher, token in _tokens:
m = matcher.match(text, pos)
if m:
return token, m.group(0), m.end()
return None, None, None
def tokenizer(selector):
pos = 0
while pos < len(selector):
token, value, end = match_token(selector, pos)
if not token:
raise Exception('Invalid selector token : %s' % selector[pos:])
pos = end
yield token, value
_selector_cache = {}
def parse_selector(selector):
if selector in _selector_cache.keys():
return _selector_cache[selector]
stack = []
for token, value in tokenizer(selector):
if token == 'name':
try:
top, _ = stack[-1]
except IndexError:
top = None
if top == '@':
stack = stack[:-1]
stack.append(('selector', AttributeSelector(value)))
else:
stack.append(('selector', NodeSelector(value)))
elif token == 'string':
a, _ = stack[-1]
_, b = stack[-2]
if a == '=' and b.typename == 'attribute':
stack = stack[:-2]
stack.append(('selector', EqualsSelector(b, value[1:-1])))
else:
raise Exception('XPath: invalid syntax for - %s' % selector)
elif token == ']':
_, a = stack[-1]
b, _ = stack[-2]
_, c = stack[-3]
if b != '[':
raise Exception('XPath: invalid syntax for - %s' % selector)
stack = stack[:-3]
stack.append(('selector', IfSelector(c, a)))
elif token == 'text()':
stack.append(('selector', TextSelector()))
else:
stack.append((token, value))
while len(stack) > 1:
_, a = stack[-1]
b, _ = stack[-2]
_, c = stack[-3]
if b != '/':
raise Exception('XPath: invalid syntax for - %s' % selector)
stack = stack[:-3]
stack.append(('selector', ChildSelector(c, a)))
_selector_cache[selector] = stack[0][1]
return stack[0][1]
class XmlNode:
def __init__(self, node):
self.node = node
self.name = node.nodeName
def __iter__(self):
for child in self.node.childNodes:
if child.nodeType == child.ELEMENT_NODE:
yield XmlNode(child)
def __getitem__(self, xpath):
for item in self.select(xpath):
return item
return None
def children(self):
for child in self.node.childNodes:
yield XmlNode(child)
def select(self, xpath):
return parse_selector(xpath).select(self)
class XmlDocument(XmlNode):
def __init__(self, filename):
XmlNode.__init__(self, minidom.parse(filename).documentElement)