587 lines
19 KiB
Python
587 lines
19 KiB
Python
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#!/usr/bin/env python
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"Makes working with XML feel like you are working with JSON"
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try:
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from defusedexpat import pyexpat as expat
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except ImportError:
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from xml.parsers import expat
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from xml.sax.saxutils import XMLGenerator
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from xml.sax.xmlreader import AttributesImpl
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try: # pragma no cover
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from cStringIO import StringIO
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except ImportError: # pragma no cover
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try:
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from StringIO import StringIO
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except ImportError:
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from io import StringIO
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from inspect import isgenerator
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class ObjectDict(dict):
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def __getattr__(self, name):
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if name in self:
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return self[name]
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else:
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raise AttributeError("No such attribute: " + name)
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try: # pragma no cover
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_basestring = basestring
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except NameError: # pragma no cover
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_basestring = str
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try: # pragma no cover
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_unicode = unicode
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except NameError: # pragma no cover
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_unicode = str
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__author__ = "Martin Blech"
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__version__ = "0.12.0"
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__license__ = "MIT"
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class ParsingInterrupted(Exception):
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pass
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class _DictSAXHandler(object):
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def __init__(
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self,
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item_depth=0,
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item_callback=lambda *args: True,
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xml_attribs=True,
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attr_prefix="@",
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cdata_key="#text",
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force_cdata=False,
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cdata_separator="",
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postprocessor=None,
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dict_constructor=ObjectDict,
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strip_whitespace=True,
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namespace_separator=":",
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namespaces=None,
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force_list=None,
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comment_key="#comment",
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):
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self.path = []
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self.stack = []
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self.data = []
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self.item = None
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self.item_depth = item_depth
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self.xml_attribs = xml_attribs
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self.item_callback = item_callback
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self.attr_prefix = attr_prefix
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self.cdata_key = cdata_key
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self.force_cdata = force_cdata
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self.cdata_separator = cdata_separator
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self.postprocessor = postprocessor
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self.dict_constructor = dict_constructor
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self.strip_whitespace = strip_whitespace
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self.namespace_separator = namespace_separator
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self.namespaces = namespaces
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self.namespace_declarations = ObjectDict()
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self.force_list = force_list
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self.comment_key = comment_key
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def _build_name(self, full_name):
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if self.namespaces is None:
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return full_name
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i = full_name.rfind(self.namespace_separator)
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if i == -1:
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return full_name
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namespace, name = full_name[:i], full_name[i + 1 :]
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try:
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short_namespace = self.namespaces[namespace]
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except KeyError:
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short_namespace = namespace
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if not short_namespace:
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return name
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else:
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return self.namespace_separator.join((short_namespace, name))
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def _attrs_to_dict(self, attrs):
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if isinstance(attrs, dict):
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return attrs
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return self.dict_constructor(zip(attrs[0::2], attrs[1::2]))
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def startNamespaceDecl(self, prefix, uri):
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self.namespace_declarations[prefix or ""] = uri
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def startElement(self, full_name, attrs):
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name = self._build_name(full_name)
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attrs = self._attrs_to_dict(attrs)
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if attrs and self.namespace_declarations:
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attrs["xmlns"] = self.namespace_declarations
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self.namespace_declarations = ObjectDict()
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self.path.append((name, attrs or None))
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if len(self.path) > self.item_depth:
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self.stack.append((self.item, self.data))
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if self.xml_attribs:
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attr_entries = []
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for key, value in attrs.items():
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key = self.attr_prefix + self._build_name(key)
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if self.postprocessor:
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entry = self.postprocessor(self.path, key, value)
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else:
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entry = (key, value)
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if entry:
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attr_entries.append(entry)
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attrs = self.dict_constructor(attr_entries)
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else:
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attrs = None
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self.item = attrs or None
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self.data = []
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def endElement(self, full_name):
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name = self._build_name(full_name)
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if len(self.path) == self.item_depth:
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item = self.item
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if item is None:
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item = None if not self.data else self.cdata_separator.join(self.data)
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should_continue = self.item_callback(self.path, item)
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if not should_continue:
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raise ParsingInterrupted()
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if len(self.stack):
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data = None if not self.data else self.cdata_separator.join(self.data)
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item = self.item
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self.item, self.data = self.stack.pop()
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if self.strip_whitespace and data:
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data = data.strip() or None
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if data and self.force_cdata and item is None:
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item = self.dict_constructor()
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if item is not None:
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if data:
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self.push_data(item, self.cdata_key, data)
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self.item = self.push_data(self.item, name, item)
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else:
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self.item = self.push_data(self.item, name, data)
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else:
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self.item = None
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self.data = []
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self.path.pop()
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def characters(self, data):
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if not self.data:
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self.data = [data]
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else:
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self.data.append(data)
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def comments(self, data):
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if self.strip_whitespace:
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data = data.strip()
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self.item = self.push_data(self.item, self.comment_key, data)
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def push_data(self, item, key, data):
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if self.postprocessor is not None:
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result = self.postprocessor(self.path, key, data)
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if result is None:
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return item
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key, data = result
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if item is None:
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item = self.dict_constructor()
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try:
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value = item[key]
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if isinstance(value, list):
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value.append(data)
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else:
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item[key] = [value, data]
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except KeyError:
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if self._should_force_list(key, data):
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item[key] = [data]
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else:
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item[key] = data
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return item
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def _should_force_list(self, key, value):
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if not self.force_list:
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return False
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if isinstance(self.force_list, bool):
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return self.force_list
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try:
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return key in self.force_list
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except TypeError:
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return self.force_list(self.path[:-1], key, value)
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def parse(
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xml_input,
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encoding=None,
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expat=expat,
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process_namespaces=False,
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namespace_separator=":",
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disable_entities=True,
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process_comments=False,
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**kwargs
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):
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"""Parse the given XML input and convert it into a dictionary.
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`xml_input` can either be a `string`, a file-like object, or a generator of strings.
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If `xml_attribs` is `True`, element attributes are put in the dictionary
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among regular child elements, using `@` as a prefix to avoid collisions. If
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set to `False`, they are just ignored.
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Simple example::
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>>> import xmltodict
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>>> doc = xmltodict.parse(\"\"\"
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... <a prop="x">
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... <b>1</b>
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... <b>2</b>
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... </a>
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... \"\"\")
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>>> doc['a']['@prop']
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u'x'
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>>> doc['a']['b']
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[u'1', u'2']
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If `item_depth` is `0`, the function returns a dictionary for the root
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element (default behavior). Otherwise, it calls `item_callback` every time
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an item at the specified depth is found and returns `None` in the end
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(streaming mode).
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The callback function receives two parameters: the `path` from the document
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root to the item (name-attribs pairs), and the `item` (dict). If the
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callback's return value is false-ish, parsing will be stopped with the
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:class:`ParsingInterrupted` exception.
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Streaming example::
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>>> def handle(path, item):
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... print('path:%s item:%s' % (path, item))
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... return True
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...
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>>> xmltodict.parse(\"\"\"
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... <a prop="x">
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... <b>1</b>
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... <b>2</b>
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... </a>\"\"\", item_depth=2, item_callback=handle)
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path:[(u'a', {u'prop': u'x'}), (u'b', None)] item:1
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path:[(u'a', {u'prop': u'x'}), (u'b', None)] item:2
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The optional argument `postprocessor` is a function that takes `path`,
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`key` and `value` as positional arguments and returns a new `(key, value)`
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pair where both `key` and `value` may have changed. Usage example::
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>>> def postprocessor(path, key, value):
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... try:
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... return key + ':int', int(value)
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... except (ValueError, TypeError):
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... return key, value
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>>> xmltodict.parse('<a><b>1</b><b>2</b><b>x</b></a>',
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... postprocessor=postprocessor)
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ObjectDict([(u'a', ObjectDict([(u'b:int', [1, 2]), (u'b', u'x')]))])
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You can pass an alternate version of `expat` (such as `defusedexpat`) by
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using the `expat` parameter. E.g:
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>>> import defusedexpat
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>>> xmltodict.parse('<a>hello</a>', expat=defusedexpat.pyexpat)
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ObjectDict([(u'a', u'hello')])
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You can use the force_list argument to force lists to be created even
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when there is only a single child of a given level of hierarchy. The
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force_list argument is a tuple of keys. If the key for a given level
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of hierarchy is in the force_list argument, that level of hierarchy
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will have a list as a child (even if there is only one sub-element).
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The index_keys operation takes precedence over this. This is applied
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after any user-supplied postprocessor has already run.
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For example, given this input:
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<servers>
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<server>
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<name>host1</name>
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<os>Linux</os>
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<interfaces>
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<interface>
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<name>em0</name>
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<ip_address>10.0.0.1</ip_address>
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</interface>
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</interfaces>
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</server>
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</servers>
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If called with force_list=('interface',), it will produce
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this dictionary:
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{'servers':
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{'server':
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{'name': 'host1',
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'os': 'Linux'},
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'interfaces':
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{'interface':
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[ {'name': 'em0', 'ip_address': '10.0.0.1' } ] } } }
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`force_list` can also be a callable that receives `path`, `key` and
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`value`. This is helpful in cases where the logic that decides whether
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a list should be forced is more complex.
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If `process_comment` is `True` then comment will be added with comment_key
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(default=`'#comment'`) to then tag which contains comment
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For example, given this input:
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<a>
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<b>
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<!-- b comment -->
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<c>
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<!-- c comment -->
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1
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</c>
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<d>2</d>
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</b>
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</a>
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If called with process_comment=True, it will produce
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this dictionary:
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'a': {
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'b': {
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'#comment': 'b comment',
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'c': {
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'#comment': 'c comment',
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'#text': '1',
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},
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'd': '2',
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},
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}
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"""
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handler = _DictSAXHandler(namespace_separator=namespace_separator, **kwargs)
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if isinstance(xml_input, _unicode):
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if not encoding:
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encoding = "utf-8"
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xml_input = xml_input.encode(encoding)
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if not process_namespaces:
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namespace_separator = None
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parser = expat.ParserCreate(encoding, namespace_separator)
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try:
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parser.ordered_attributes = True
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except AttributeError:
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# Jython's expat does not support ordered_attributes
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pass
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parser.StartNamespaceDeclHandler = handler.startNamespaceDecl
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parser.StartElementHandler = handler.startElement
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parser.EndElementHandler = handler.endElement
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parser.CharacterDataHandler = handler.characters
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if process_comments:
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parser.CommentHandler = handler.comments
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parser.buffer_text = True
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if disable_entities:
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try:
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# Attempt to disable DTD in Jython's expat parser (Xerces-J).
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feature = "http://apache.org/xml/features/disallow-doctype-decl"
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parser._reader.setFeature(feature, True)
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except AttributeError:
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# For CPython / expat parser.
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# Anything not handled ends up here and entities aren't expanded.
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parser.DefaultHandler = lambda x: None
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# Expects an integer return; zero means failure -> expat.ExpatError.
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parser.ExternalEntityRefHandler = lambda *x: 1
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if hasattr(xml_input, "read"):
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|
|
parser.ParseFile(xml_input)
|
||
|
|
elif isgenerator(xml_input):
|
||
|
|
for chunk in xml_input:
|
||
|
|
parser.Parse(chunk, False)
|
||
|
|
parser.Parse(b"", True)
|
||
|
|
else:
|
||
|
|
parser.Parse(xml_input, True)
|
||
|
|
return handler.item
|
||
|
|
|
||
|
|
|
||
|
|
def _process_namespace(name, namespaces, ns_sep=":", attr_prefix="@"):
|
||
|
|
if not namespaces:
|
||
|
|
return name
|
||
|
|
try:
|
||
|
|
ns, name = name.rsplit(ns_sep, 1)
|
||
|
|
except ValueError:
|
||
|
|
pass
|
||
|
|
else:
|
||
|
|
ns_res = namespaces.get(ns.strip(attr_prefix))
|
||
|
|
name = (
|
||
|
|
"{}{}{}{}".format(
|
||
|
|
attr_prefix if ns.startswith(attr_prefix) else "", ns_res, ns_sep, name
|
||
|
|
)
|
||
|
|
if ns_res
|
||
|
|
else name
|
||
|
|
)
|
||
|
|
return name
|
||
|
|
|
||
|
|
|
||
|
|
def _emit(
|
||
|
|
key,
|
||
|
|
value,
|
||
|
|
content_handler,
|
||
|
|
attr_prefix="@",
|
||
|
|
cdata_key="#text",
|
||
|
|
depth=0,
|
||
|
|
preprocessor=None,
|
||
|
|
pretty=False,
|
||
|
|
newl="\n",
|
||
|
|
indent="\t",
|
||
|
|
namespace_separator=":",
|
||
|
|
namespaces=None,
|
||
|
|
full_document=True,
|
||
|
|
expand_iter=None,
|
||
|
|
):
|
||
|
|
key = _process_namespace(key, namespaces, namespace_separator, attr_prefix)
|
||
|
|
if preprocessor is not None:
|
||
|
|
result = preprocessor(key, value)
|
||
|
|
if result is None:
|
||
|
|
return
|
||
|
|
key, value = result
|
||
|
|
if (
|
||
|
|
not hasattr(value, "__iter__")
|
||
|
|
or isinstance(value, _basestring)
|
||
|
|
or isinstance(value, dict)
|
||
|
|
):
|
||
|
|
value = [value]
|
||
|
|
for index, v in enumerate(value):
|
||
|
|
if full_document and depth == 0 and index > 0:
|
||
|
|
raise ValueError("document with multiple roots")
|
||
|
|
if v is None:
|
||
|
|
v = ObjectDict()
|
||
|
|
elif isinstance(v, bool):
|
||
|
|
if v:
|
||
|
|
v = _unicode("true")
|
||
|
|
else:
|
||
|
|
v = _unicode("false")
|
||
|
|
elif not isinstance(v, dict):
|
||
|
|
if (
|
||
|
|
expand_iter
|
||
|
|
and hasattr(v, "__iter__")
|
||
|
|
and not isinstance(v, _basestring)
|
||
|
|
):
|
||
|
|
v = ObjectDict(((expand_iter, v),))
|
||
|
|
else:
|
||
|
|
v = _unicode(v)
|
||
|
|
if isinstance(v, _basestring):
|
||
|
|
v = ObjectDict(((cdata_key, v),))
|
||
|
|
cdata = None
|
||
|
|
attrs = ObjectDict()
|
||
|
|
children = []
|
||
|
|
for ik, iv in v.items():
|
||
|
|
if ik == cdata_key:
|
||
|
|
cdata = iv
|
||
|
|
continue
|
||
|
|
if ik.startswith(attr_prefix):
|
||
|
|
ik = _process_namespace(
|
||
|
|
ik, namespaces, namespace_separator, attr_prefix
|
||
|
|
)
|
||
|
|
if ik == "@xmlns" and isinstance(iv, dict):
|
||
|
|
for k, v in iv.items():
|
||
|
|
attr = "xmlns{}".format(":{}".format(k) if k else "")
|
||
|
|
attrs[attr] = _unicode(v)
|
||
|
|
continue
|
||
|
|
if not isinstance(iv, _unicode):
|
||
|
|
iv = _unicode(iv)
|
||
|
|
attrs[ik[len(attr_prefix) :]] = iv
|
||
|
|
continue
|
||
|
|
children.append((ik, iv))
|
||
|
|
if pretty:
|
||
|
|
content_handler.ignorableWhitespace(depth * indent)
|
||
|
|
content_handler.startElement(key, AttributesImpl(attrs))
|
||
|
|
if pretty and children:
|
||
|
|
content_handler.ignorableWhitespace(newl)
|
||
|
|
for child_key, child_value in children:
|
||
|
|
_emit(
|
||
|
|
child_key,
|
||
|
|
child_value,
|
||
|
|
content_handler,
|
||
|
|
attr_prefix,
|
||
|
|
cdata_key,
|
||
|
|
depth + 1,
|
||
|
|
preprocessor,
|
||
|
|
pretty,
|
||
|
|
newl,
|
||
|
|
indent,
|
||
|
|
namespaces=namespaces,
|
||
|
|
namespace_separator=namespace_separator,
|
||
|
|
expand_iter=expand_iter,
|
||
|
|
)
|
||
|
|
if cdata is not None:
|
||
|
|
content_handler.characters(cdata)
|
||
|
|
if pretty and children:
|
||
|
|
content_handler.ignorableWhitespace(depth * indent)
|
||
|
|
content_handler.endElement(key)
|
||
|
|
if pretty and depth:
|
||
|
|
content_handler.ignorableWhitespace(newl)
|
||
|
|
|
||
|
|
|
||
|
|
def unparse(
|
||
|
|
input_dict,
|
||
|
|
output=None,
|
||
|
|
encoding="utf-8",
|
||
|
|
full_document=True,
|
||
|
|
short_empty_elements=False,
|
||
|
|
**kwargs
|
||
|
|
):
|
||
|
|
"""Emit an XML document for the given `input_dict` (reverse of `parse`).
|
||
|
|
|
||
|
|
The resulting XML document is returned as a string, but if `output` (a
|
||
|
|
file-like object) is specified, it is written there instead.
|
||
|
|
|
||
|
|
Dictionary keys prefixed with `attr_prefix` (default=`'@'`) are interpreted
|
||
|
|
as XML node attributes, whereas keys equal to `cdata_key`
|
||
|
|
(default=`'#text'`) are treated as character data.
|
||
|
|
|
||
|
|
The `pretty` parameter (default=`False`) enables pretty-printing. In this
|
||
|
|
mode, lines are terminated with `'\n'` and indented with `'\t'`, but this
|
||
|
|
can be customized with the `newl` and `indent` parameters.
|
||
|
|
|
||
|
|
"""
|
||
|
|
if full_document and len(input_dict) != 1:
|
||
|
|
raise ValueError("Document must have exactly one root.")
|
||
|
|
must_return = False
|
||
|
|
if output is None:
|
||
|
|
output = StringIO()
|
||
|
|
must_return = True
|
||
|
|
if short_empty_elements:
|
||
|
|
content_handler = XMLGenerator(output, encoding, True)
|
||
|
|
else:
|
||
|
|
content_handler = XMLGenerator(output, encoding)
|
||
|
|
if full_document:
|
||
|
|
content_handler.startDocument()
|
||
|
|
for key, value in input_dict.items():
|
||
|
|
_emit(key, value, content_handler, full_document=full_document, **kwargs)
|
||
|
|
if full_document:
|
||
|
|
content_handler.endDocument()
|
||
|
|
if must_return:
|
||
|
|
value = output.getvalue()
|
||
|
|
try: # pragma no cover
|
||
|
|
value = value.decode(encoding)
|
||
|
|
except AttributeError: # pragma no cover
|
||
|
|
pass
|
||
|
|
return value
|
||
|
|
|
||
|
|
|
||
|
|
if __name__ == "__main__": # pragma: no cover
|
||
|
|
import sys
|
||
|
|
import marshal
|
||
|
|
|
||
|
|
try:
|
||
|
|
stdin = sys.stdin.buffer
|
||
|
|
stdout = sys.stdout.buffer
|
||
|
|
except AttributeError:
|
||
|
|
stdin = sys.stdin
|
||
|
|
stdout = sys.stdout
|
||
|
|
|
||
|
|
(item_depth,) = sys.argv[1:]
|
||
|
|
item_depth = int(item_depth)
|
||
|
|
|
||
|
|
def handle_item(path, item):
|
||
|
|
marshal.dump((path, item), stdout)
|
||
|
|
return True
|
||
|
|
|
||
|
|
try:
|
||
|
|
root = parse(
|
||
|
|
stdin,
|
||
|
|
item_depth=item_depth,
|
||
|
|
item_callback=handle_item,
|
||
|
|
dict_constructor=dict,
|
||
|
|
)
|
||
|
|
if item_depth == 0:
|
||
|
|
handle_item([], root)
|
||
|
|
except KeyboardInterrupt:
|
||
|
|
pass
|