/usr/lib/python3/dist-packages/pypeg2/xmlast.py is in python3-pypeg2 2.15.2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 | """
XML AST generator
pyPEG parsing framework
Copyleft 2012, Volker Birk.
This program is under GNU General Public License 2.0.
"""
from __future__ import unicode_literals
try:
str = unicode
except NameError:
pass
__version__ = 2.15
__author__ = "Volker Birk"
__license__ = "This program is under GNU General Public License 2.0."
__url__ = "http://fdik.org/pyPEG"
try:
import lxml
from lxml import etree
except ImportError:
import xml.etree.ElementTree as etree
if __debug__:
import warnings
import pypeg2
def create_tree(thing, parent=None, object_names=False):
"""Create an XML etree from a thing.
Arguments:
thing thing to interpret
parent etree.Element to put subtree into
default: create a new Element tree
object_names experimental feature: if True tag names are object
names instead of types
Returns:
etree.Element instance created
"""
try:
grammar = type(thing).grammar
except AttributeError:
if isinstance(thing, list):
grammar = pypeg2.csl(pypeg2.name())
else:
grammar = pypeg2.word
name = type(thing).__name__
if object_names:
try:
name = str(thing.name)
name = name.replace(" ", "_")
except AttributeError:
pass
if parent is None:
me = etree.Element(name)
else:
me = etree.SubElement(parent, name)
for e in pypeg2.attributes(grammar):
if object_names and e.name == "name":
if name != type(thing).__name__:
continue
key, value = e.name, getattr(thing, e.name, None)
if value is not None:
if pypeg2._issubclass(e.thing, (str, int, pypeg2.Literal)) \
or type(e.thing) == pypeg2._RegEx:
me.set(key, str(value))
else:
create_tree(value, me, object_names)
if isinstance(thing, list):
things = thing
elif isinstance(thing, pypeg2.Namespace):
things = thing.values()
else:
things = []
last = None
for t in things:
if type(t) == str:
if last is not None:
last.tail = str(t)
else:
me.text = str(t)
else:
last = create_tree(t, me, object_names)
if isinstance(thing, str):
me.text = str(thing)
return me
def thing2xml(thing, pretty=False, object_names=False):
"""Create XML text from a thing.
Arguments:
thing thing to interpret
pretty True if XML should be indented
False if XML should be plain
object_names experimental feature: if True tag names are object
names instead of types
Returns:
bytes with encoded XML
"""
tree = create_tree(thing, None, object_names)
try:
if lxml:
return etree.tostring(tree, pretty_print=pretty)
except NameError:
if __debug__:
if pretty:
warnings.warn("lxml is needed for pretty printing",
ImportWarning)
return etree.tostring(tree)
def create_thing(element, symbol_table):
"""Create thing from an XML element.
Arguments:
element etree.Element instance to read
symbol_table symbol table where the classes can be found
Returns:
thing created
"""
C = symbol_table[element.tag]
if element.text:
thing = C(element.text)
else:
thing = C()
subs = iter(element)
iterated_already = False
try:
grammar = C.grammar
except AttributeError:
pass
else:
for e in pypeg2.attributes(grammar):
key = e.name
if pypeg2._issubclass(e.thing, (str, int, pypeg2.Literal)) \
or type(e.thing) == pypeg2._RegEx:
try:
value = element.attrib[e.name]
except KeyError:
pass
else:
setattr(thing, key, e.thing(value))
else:
try:
if not iterated_already:
iterated_already = True
sub = next(subs)
except StopIteration:
pass
if sub.tag == e.thing.__name__:
iterated_already = False
t = create_thing(sub, symbol_table)
setattr(thing, key, t)
if issubclass(C, list) or issubclass(C, pypeg2.Namespace):
try:
while True:
if iterated_already:
iterated_alread = False
else:
sub = next(subs)
t = create_thing(sub, symbol_table)
if isinstance(thing, pypeg2.List):
thing.append(t)
else:
thing[t.name] = t
except StopIteration:
pass
return thing
def xml2thing(xml, symbol_table):
"""Create thing from XML text.
Arguments:
xml bytes with encoded XML
symbol_table symbol table where the classes can be found
Returns:
created thing
"""
element = etree.fromstring(xml)
return create_thing(element, symbol_table)
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