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Romain Courteaud
erp5_rtl_support
Commits
12354a76
Commit
12354a76
authored
Jul 01, 2014
by
Vincent Pelletier
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ERP5Type: Add XMLUtils.
parent
27f4b03d
Changes
2
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2 changed files
with
83 additions
and
0 deletions
+83
-0
product/ERP5Type/XMLUtils.py
product/ERP5Type/XMLUtils.py
+82
-0
product/ERP5Type/__init__.py
product/ERP5Type/__init__.py
+1
-0
No files found.
product/ERP5Type/XMLUtils.py
0 → 100644
View file @
12354a76
from
xml.etree.ElementTree
import
iterparse
,
Element
,
TreeBuilder
,
XMLParser
from
.XMLMatrix
import
INFINITE_SET
class
RestrictedElement
(
Element
):
__allow_access_to_unprotected_subobjects__
=
1
class
ChildDiscardingElement
(
RestrictedElement
):
"""
Ignores any children added to it.
Useful to parse large files, so as many-children nodes actually discards
them to free memory.
"""
def
__init__
(
self
,
tag
,
expected_tag_set
):
super
(
ChildDiscardingElement
,
self
).
__init__
(
tag
)
self
.
__expected_tag_set
=
expected_tag_set
def
__single
(
self
,
child
):
if
not
(
isinstance
(
child
,
ChildDiscardingElement
)
or
child
.
tag
in
self
.
__expected_tag_set
):
raise
ValueError
(
'Unexpected discarded tag: %r (inside %r)'
%
(
child
.
tag
,
self
.
tag
,
))
append
=
__single
def
extend
(
self
,
elements
):
for
child
in
elements
:
self
.
__single
(
child
)
def
insert
(
self
,
index
,
element
):
self
.
__single
(
element
)
def
parseStream
(
stream
,
child_discard_set
,
callback_dict
,
catchall
=
None
):
"""
stream (opened read stream)
Where XML data is read from. Expects a "read" method following the
"file" API.
child_discard_set (anything implementing '__in__')
Set of tags whose children should be discarded while parsing.
callback_dict (dict)
Dict of callables per event and tag type, to be called for these
combinations when encountered. Expected structure is:
{
(event, tag): callable(element) -> None,
}
See xml.etree.ElementTree.iterparse for a list of possible events.
catchall (None, callable(element) -> None)
Callback triggered for all actually triggered events but not declared in
callback_dict.
If None, a ValueError exception will be raised when an element whose tag is
present in child_discard_set receives a non-child-discarding child for
which neither "start" nor "end" callback exist.
"""
if
catchall
is
None
:
catchall
=
lambda
x
:
None
callback_set
=
set
(
y
for
x
,
y
in
callback_dict
if
x
in
(
'start'
,
'end'
,
None
)
# None is equivalent to 'end'
)
else
:
callback_set
=
INFINITE_SET
def
elementFactory
(
tag
,
attrs
):
if
tag
in
child_discard_set
:
return
ChildDiscardingElement
(
tag
,
callback_set
)
return
RestrictedElement
(
tag
,
attrs
)
for
event
,
elem
in
iterparse
(
stream
,
events
=
set
([
x
for
x
,
_
in
callback_dict
.
iterkeys
()]),
parser
=
XMLParser
(
target
=
TreeBuilder
(
element_factory
=
elementFactory
,
),
),
):
callback_dict
.
get
((
event
,
elem
.
tag
),
catchall
)(
elem
)
\ No newline at end of file
product/ERP5Type/__init__.py
View file @
12354a76
...
...
@@ -180,6 +180,7 @@ ModuleSecurityInfo('Products.ERP5Type.Constraint').declarePublic('PropertyTypeVa
ModuleSecurityInfo
(
'Products.ERP5Type.collections'
).
declarePublic
(
'OrderedDict'
)
ModuleSecurityInfo
(
'Products.ERP5Type.DiffUtils'
).
declarePublic
(
'DiffFile'
)
ModuleSecurityInfo
(
'pprint'
).
declarePublic
(
'pformat'
,
'pprint'
)
ModuleSecurityInfo
(
'Products.ERP5Type.XMLUtils'
).
declarePublic
(
'parseStream'
)
import
zExceptions
ModuleSecurityInfo
(
'zExceptions'
).
declarePublic
(
*
filter
(
...
...
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