173 lines
5.9 KiB
Python
173 lines
5.9 KiB
Python
# -*- coding: utf-8 -*-
|
|
"""
|
|
babel.messages.checkers
|
|
~~~~~~~~~~~~~~~~~~~~~~~
|
|
|
|
Various routines that help with validation of translations.
|
|
|
|
:since: version 0.9
|
|
|
|
:copyright: (c) 2013-2019 by the Babel Team.
|
|
:license: BSD, see LICENSE for more details.
|
|
"""
|
|
|
|
from babel.messages.catalog import TranslationError, PYTHON_FORMAT
|
|
from babel._compat import string_types, izip
|
|
|
|
|
|
#: list of format chars that are compatible to each other
|
|
_string_format_compatibilities = [
|
|
{'i', 'd', 'u'},
|
|
{'x', 'X'},
|
|
{'f', 'F', 'g', 'G'}
|
|
]
|
|
|
|
|
|
def num_plurals(catalog, message):
|
|
"""Verify the number of plurals in the translation."""
|
|
if not message.pluralizable:
|
|
if not isinstance(message.string, string_types):
|
|
raise TranslationError("Found plural forms for non-pluralizable "
|
|
"message")
|
|
return
|
|
|
|
# skip further tests if no catalog is provided.
|
|
elif catalog is None:
|
|
return
|
|
|
|
msgstrs = message.string
|
|
if not isinstance(msgstrs, (list, tuple)):
|
|
msgstrs = (msgstrs,)
|
|
if len(msgstrs) != catalog.num_plurals:
|
|
raise TranslationError("Wrong number of plural forms (expected %d)" %
|
|
catalog.num_plurals)
|
|
|
|
|
|
def python_format(catalog, message):
|
|
"""Verify the format string placeholders in the translation."""
|
|
if 'python-format' not in message.flags:
|
|
return
|
|
msgids = message.id
|
|
if not isinstance(msgids, (list, tuple)):
|
|
msgids = (msgids,)
|
|
msgstrs = message.string
|
|
if not isinstance(msgstrs, (list, tuple)):
|
|
msgstrs = (msgstrs,)
|
|
|
|
for msgid, msgstr in izip(msgids, msgstrs):
|
|
if msgstr:
|
|
_validate_format(msgid, msgstr)
|
|
|
|
|
|
def _validate_format(format, alternative):
|
|
"""Test format string `alternative` against `format`. `format` can be the
|
|
msgid of a message and `alternative` one of the `msgstr`\\s. The two
|
|
arguments are not interchangeable as `alternative` may contain less
|
|
placeholders if `format` uses named placeholders.
|
|
|
|
The behavior of this function is undefined if the string does not use
|
|
string formattings.
|
|
|
|
If the string formatting of `alternative` is compatible to `format` the
|
|
function returns `None`, otherwise a `TranslationError` is raised.
|
|
|
|
Examples for compatible format strings:
|
|
|
|
>>> _validate_format('Hello %s!', 'Hallo %s!')
|
|
>>> _validate_format('Hello %i!', 'Hallo %d!')
|
|
|
|
Example for an incompatible format strings:
|
|
|
|
>>> _validate_format('Hello %(name)s!', 'Hallo %s!')
|
|
Traceback (most recent call last):
|
|
...
|
|
TranslationError: the format strings are of different kinds
|
|
|
|
This function is used by the `python_format` checker.
|
|
|
|
:param format: The original format string
|
|
:param alternative: The alternative format string that should be checked
|
|
against format
|
|
:raises TranslationError: on formatting errors
|
|
"""
|
|
|
|
def _parse(string):
|
|
result = []
|
|
for match in PYTHON_FORMAT.finditer(string):
|
|
name, format, typechar = match.groups()
|
|
if typechar == '%' and name is None:
|
|
continue
|
|
result.append((name, str(typechar)))
|
|
return result
|
|
|
|
def _compatible(a, b):
|
|
if a == b:
|
|
return True
|
|
for set in _string_format_compatibilities:
|
|
if a in set and b in set:
|
|
return True
|
|
return False
|
|
|
|
def _check_positional(results):
|
|
positional = None
|
|
for name, char in results:
|
|
if positional is None:
|
|
positional = name is None
|
|
else:
|
|
if (name is None) != positional:
|
|
raise TranslationError('format string mixes positional '
|
|
'and named placeholders')
|
|
return bool(positional)
|
|
|
|
a, b = map(_parse, (format, alternative))
|
|
|
|
# now check if both strings are positional or named
|
|
a_positional, b_positional = map(_check_positional, (a, b))
|
|
if a_positional and not b_positional and not b:
|
|
raise TranslationError('placeholders are incompatible')
|
|
elif a_positional != b_positional:
|
|
raise TranslationError('the format strings are of different kinds')
|
|
|
|
# if we are operating on positional strings both must have the
|
|
# same number of format chars and those must be compatible
|
|
if a_positional:
|
|
if len(a) != len(b):
|
|
raise TranslationError('positional format placeholders are '
|
|
'unbalanced')
|
|
for idx, ((_, first), (_, second)) in enumerate(izip(a, b)):
|
|
if not _compatible(first, second):
|
|
raise TranslationError('incompatible format for placeholder '
|
|
'%d: %r and %r are not compatible' %
|
|
(idx + 1, first, second))
|
|
|
|
# otherwise the second string must not have names the first one
|
|
# doesn't have and the types of those included must be compatible
|
|
else:
|
|
type_map = dict(a)
|
|
for name, typechar in b:
|
|
if name not in type_map:
|
|
raise TranslationError('unknown named placeholder %r' % name)
|
|
elif not _compatible(typechar, type_map[name]):
|
|
raise TranslationError('incompatible format for '
|
|
'placeholder %r: '
|
|
'%r and %r are not compatible' %
|
|
(name, typechar, type_map[name]))
|
|
|
|
|
|
def _find_checkers():
|
|
checkers = []
|
|
try:
|
|
from pkg_resources import working_set
|
|
except ImportError:
|
|
pass
|
|
else:
|
|
for entry_point in working_set.iter_entry_points('babel.checkers'):
|
|
checkers.append(entry_point.load())
|
|
if len(checkers) == 0:
|
|
# if pkg_resources is not available or no usable egg-info was found
|
|
# (see #230), just resort to hard-coded checkers
|
|
return [num_plurals, python_format]
|
|
return checkers
|
|
|
|
|
|
checkers = _find_checkers()
|