490 lines
17 KiB
Python
490 lines
17 KiB
Python
#!/usr/bin/env python
|
|
"""Makes working with XML feel like you are working with JSON"""
|
|
|
|
try:
|
|
from defusedexpat import pyexpat as expat
|
|
except ImportError:
|
|
from xml.parsers import expat
|
|
|
|
from xml.sax.saxutils import XMLGenerator
|
|
from xml.sax.xmlreader import AttributesImpl
|
|
try: # pragma no cover
|
|
from cStringIO import StringIO
|
|
except ImportError: # pragma no cover
|
|
try:
|
|
from StringIO import StringIO
|
|
except ImportError:
|
|
from io import StringIO
|
|
|
|
from collections import OrderedDict
|
|
|
|
try: # pragma no cover
|
|
_basestring = basestring
|
|
except NameError: # pragma no cover
|
|
_basestring = str
|
|
try: # pragma no cover
|
|
_unicode = unicode
|
|
except NameError: # pragma no cover
|
|
_unicode = str
|
|
|
|
__author__ = 'Martin Blech'
|
|
__version__ = '0.12.0'
|
|
__license__ = 'MIT'
|
|
|
|
|
|
class ParsingInterrupted(Exception):
|
|
pass
|
|
|
|
|
|
class _DictSAXHandler(object):
|
|
def __init__(self,
|
|
item_depth=0,
|
|
item_callback=lambda *args: True,
|
|
xml_attribs=True,
|
|
attr_prefix='@',
|
|
cdata_key='#text',
|
|
force_cdata=False,
|
|
cdata_separator='',
|
|
postprocessor=None,
|
|
dict_constructor=OrderedDict,
|
|
strip_whitespace=True,
|
|
namespace_separator=':',
|
|
namespaces=None,
|
|
force_list=None):
|
|
self.path = []
|
|
self.stack = []
|
|
self.data = []
|
|
self.item = None
|
|
self.item_depth = item_depth
|
|
self.xml_attribs = xml_attribs
|
|
self.item_callback = item_callback
|
|
self.attr_prefix = attr_prefix
|
|
self.cdata_key = cdata_key
|
|
self.force_cdata = force_cdata
|
|
self.cdata_separator = cdata_separator
|
|
self.postprocessor = postprocessor
|
|
self.dict_constructor = dict_constructor
|
|
self.strip_whitespace = strip_whitespace
|
|
self.namespace_separator = namespace_separator
|
|
self.namespaces = namespaces
|
|
self.namespace_declarations = OrderedDict()
|
|
self.force_list = force_list
|
|
|
|
def _build_name(self, full_name):
|
|
if not self.namespaces:
|
|
return full_name
|
|
i = full_name.rfind(self.namespace_separator)
|
|
if i == -1:
|
|
return full_name
|
|
namespace, name = full_name[:i], full_name[i+1:]
|
|
short_namespace = self.namespaces.get(namespace, namespace)
|
|
if not short_namespace:
|
|
return name
|
|
else:
|
|
return self.namespace_separator.join((short_namespace, name))
|
|
|
|
def _attrs_to_dict(self, attrs):
|
|
if isinstance(attrs, dict):
|
|
return attrs
|
|
return self.dict_constructor(zip(attrs[0::2], attrs[1::2]))
|
|
|
|
def startNamespaceDecl(self, prefix, uri):
|
|
self.namespace_declarations[prefix or ''] = uri
|
|
|
|
def startElement(self, full_name, attrs):
|
|
name = self._build_name(full_name)
|
|
attrs = self._attrs_to_dict(attrs)
|
|
if attrs and self.namespace_declarations:
|
|
attrs['xmlns'] = self.namespace_declarations
|
|
self.namespace_declarations = OrderedDict()
|
|
self.path.append((name, attrs or None))
|
|
if len(self.path) > self.item_depth:
|
|
self.stack.append((self.item, self.data))
|
|
if self.xml_attribs:
|
|
attr_entries = []
|
|
for key, value in attrs.items():
|
|
key = self.attr_prefix+self._build_name(key)
|
|
if self.postprocessor:
|
|
entry = self.postprocessor(self.path, key, value)
|
|
else:
|
|
entry = (key, value)
|
|
if entry:
|
|
attr_entries.append(entry)
|
|
attrs = self.dict_constructor(attr_entries)
|
|
else:
|
|
attrs = None
|
|
self.item = attrs or None
|
|
self.data = []
|
|
|
|
def endElement(self, full_name):
|
|
name = self._build_name(full_name)
|
|
if len(self.path) == self.item_depth:
|
|
item = self.item
|
|
if item is None:
|
|
item = (None if not self.data
|
|
else self.cdata_separator.join(self.data))
|
|
|
|
should_continue = self.item_callback(self.path, item)
|
|
if not should_continue:
|
|
raise ParsingInterrupted()
|
|
if len(self.stack):
|
|
data = (None if not self.data
|
|
else self.cdata_separator.join(self.data))
|
|
item = self.item
|
|
self.item, self.data = self.stack.pop()
|
|
if self.strip_whitespace and data:
|
|
data = data.strip() or None
|
|
if data and self.force_cdata and item is None:
|
|
item = self.dict_constructor()
|
|
if item is not None:
|
|
if data:
|
|
self.push_data(item, self.cdata_key, data)
|
|
self.item = self.push_data(self.item, name, item)
|
|
else:
|
|
self.item = self.push_data(self.item, name, data)
|
|
else:
|
|
self.item = None
|
|
self.data = []
|
|
self.path.pop()
|
|
|
|
def characters(self, data):
|
|
if not self.data:
|
|
self.data = [data]
|
|
else:
|
|
self.data.append(data)
|
|
|
|
def push_data(self, item, key, data):
|
|
if self.postprocessor is not None:
|
|
result = self.postprocessor(self.path, key, data)
|
|
if result is None:
|
|
return item
|
|
key, data = result
|
|
if item is None:
|
|
item = self.dict_constructor()
|
|
try:
|
|
value = item[key]
|
|
if isinstance(value, list):
|
|
value.append(data)
|
|
else:
|
|
item[key] = [value, data]
|
|
except KeyError:
|
|
if self._should_force_list(key, data):
|
|
item[key] = [data]
|
|
else:
|
|
item[key] = data
|
|
return item
|
|
|
|
def _should_force_list(self, key, value):
|
|
if not self.force_list:
|
|
return False
|
|
if isinstance(self.force_list, bool):
|
|
return self.force_list
|
|
try:
|
|
return key in self.force_list
|
|
except TypeError:
|
|
return self.force_list(self.path[:-1], key, value)
|
|
|
|
|
|
def parse(xml_input, encoding=None, expat=expat, process_namespaces=False,
|
|
namespace_separator=':', disable_entities=True, **kwargs):
|
|
"""Parse the given XML input and convert it into a dictionary.
|
|
|
|
`xml_input` can either be a `string` or a file-like object.
|
|
|
|
If `xml_attribs` is `True`, element attributes are put in the dictionary
|
|
among regular child elements, using `@` as a prefix to avoid collisions. If
|
|
set to `False`, they are just ignored.
|
|
|
|
Simple example::
|
|
|
|
>>> from xmltodict import xmltodict
|
|
>>> doc = xmltodict.parse(\"\"\"
|
|
... <a prop="x">
|
|
... <b>1</b>
|
|
... <b>2</b>
|
|
... </a>
|
|
... \"\"\")
|
|
>>> doc['a']['@prop']
|
|
u'x'
|
|
>>> doc['a']['b']
|
|
[u'1', u'2']
|
|
|
|
If `item_depth` is `0`, the function returns a dictionary for the root
|
|
element (default behavior). Otherwise, it calls `item_callback` every time
|
|
an item at the specified depth is found and returns `None` in the end
|
|
(streaming mode).
|
|
|
|
The callback function receives two parameters: the `path` from the document
|
|
root to the item (name-attribs pairs), and the `item` (dict). If the
|
|
callback's return value is false-ish, parsing will be stopped with the
|
|
:class:`ParsingInterrupted` exception.
|
|
|
|
Streaming example::
|
|
|
|
>>> def handle(path, item):
|
|
... print('path:%s item:%s' % (path, item))
|
|
... return True
|
|
...
|
|
>>> xmltodict.parse(\"\"\"
|
|
... <a prop="x">
|
|
... <b>1</b>
|
|
... <b>2</b>
|
|
... </a>\"\"\", item_depth=2, item_callback=handle)
|
|
path:[(u'a', {u'prop': u'x'}), (u'b', None)] item:1
|
|
path:[(u'a', {u'prop': u'x'}), (u'b', None)] item:2
|
|
|
|
The optional argument `postprocessor` is a function that takes `path`,
|
|
`key` and `value` as positional arguments and returns a new `(key, value)`
|
|
pair where both `key` and `value` may have changed. Usage example::
|
|
|
|
>>> def postprocessor(path, key, value):
|
|
... try:
|
|
... return key + ':int', int(value)
|
|
... except (ValueError, TypeError):
|
|
... return key, value
|
|
>>> xmltodict.parse('<a><b>1</b><b>2</b><b>x</b></a>',
|
|
... postprocessor=postprocessor)
|
|
OrderedDict([(u'a', OrderedDict([(u'b:int', [1, 2]), (u'b', u'x')]))])
|
|
|
|
You can pass an alternate version of `expat` (such as `defusedexpat`) by
|
|
using the `expat` parameter. E.g:
|
|
|
|
>>> import defusedexpat
|
|
>>> xmltodict.parse('<a>hello</a>', expat=defusedexpat.pyexpat)
|
|
OrderedDict([(u'a', u'hello')])
|
|
|
|
You can use the force_list argument to force lists to be created even
|
|
when there is only a single child of a given level of hierarchy. The
|
|
force_list argument is a tuple of keys. If the key for a given level
|
|
of hierarchy is in the force_list argument, that level of hierarchy
|
|
will have a list as a child (even if there is only one sub-element).
|
|
The index_keys operation takes precendence over this. This is applied
|
|
after any user-supplied postprocessor has already run.
|
|
|
|
For example, given this input:
|
|
<servers>
|
|
<server>
|
|
<name>host1</name>
|
|
<os>Linux</os>
|
|
<interfaces>
|
|
<interface>
|
|
<name>em0</name>
|
|
<ip_address>10.0.0.1</ip_address>
|
|
</interface>
|
|
</interfaces>
|
|
</server>
|
|
</servers>
|
|
|
|
If called with force_list=('interface',), it will produce
|
|
this dictionary:
|
|
{'servers':
|
|
{'server':
|
|
{'name': 'host1',
|
|
'os': 'Linux'},
|
|
'interfaces':
|
|
{'interface':
|
|
[ {'name': 'em0', 'ip_address': '10.0.0.1' } ] } } }
|
|
|
|
`force_list` can also be a callable that receives `path`, `key` and
|
|
`value`. This is helpful in cases where the logic that decides whether
|
|
a list should be forced is more complex.
|
|
"""
|
|
handler = _DictSAXHandler(namespace_separator=namespace_separator,
|
|
**kwargs)
|
|
if isinstance(xml_input, _unicode):
|
|
if not encoding:
|
|
encoding = 'utf-8'
|
|
xml_input = xml_input.encode(encoding)
|
|
if not process_namespaces:
|
|
namespace_separator = None
|
|
parser = expat.ParserCreate(
|
|
encoding,
|
|
namespace_separator
|
|
)
|
|
try:
|
|
parser.ordered_attributes = True
|
|
except AttributeError:
|
|
# Jython's expat does not support ordered_attributes
|
|
pass
|
|
parser.StartNamespaceDeclHandler = handler.startNamespaceDecl
|
|
parser.StartElementHandler = handler.startElement
|
|
parser.EndElementHandler = handler.endElement
|
|
parser.CharacterDataHandler = handler.characters
|
|
parser.buffer_text = True
|
|
if disable_entities:
|
|
try:
|
|
# Attempt to disable DTD in Jython's expat parser (Xerces-J).
|
|
feature = "http://apache.org/xml/features/disallow-doctype-decl"
|
|
parser._reader.setFeature(feature, True)
|
|
except AttributeError:
|
|
# For CPython / expat parser.
|
|
# Anything not handled ends up here and entities aren't expanded.
|
|
parser.DefaultHandler = lambda x: None
|
|
# Expects an integer return; zero means failure -> expat.ExpatError.
|
|
parser.ExternalEntityRefHandler = lambda *x: 1
|
|
if hasattr(xml_input, 'read'):
|
|
parser.ParseFile(xml_input)
|
|
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):
|
|
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 = OrderedDict()
|
|
elif isinstance(v, bool):
|
|
if v:
|
|
v = _unicode('true')
|
|
else:
|
|
v = _unicode('false')
|
|
elif not isinstance(v, dict):
|
|
v = _unicode(v)
|
|
if isinstance(v, _basestring):
|
|
v = OrderedDict(((cdata_key, v),))
|
|
cdata = None
|
|
attrs = OrderedDict()
|
|
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)
|
|
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
|