bbf6d9b026
Bugfix for feeds
- removed categories related and up
- load new books now working
- category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
489 lines
16 KiB
Python
489 lines
16 KiB
Python
# -*- coding: utf-8 -*-
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"""
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babel.numbers
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~~~~~~~~~~~~~
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CLDR Plural support. See UTS #35.
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:copyright: (c) 2013 by the Babel Team.
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:license: BSD, see LICENSE for more details.
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"""
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import re
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_plural_tags = ('zero', 'one', 'two', 'few', 'many', 'other')
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_fallback_tag = 'other'
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class PluralRule(object):
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"""Represents a set of language pluralization rules. The constructor
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accepts a list of (tag, expr) tuples or a dict of CLDR rules. The
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resulting object is callable and accepts one parameter with a positive or
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negative number (both integer and float) for the number that indicates the
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plural form for a string and returns the tag for the format:
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>>> rule = PluralRule({'one': 'n is 1'})
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>>> rule(1)
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'one'
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>>> rule(2)
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'other'
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Currently the CLDR defines these tags: zero, one, two, few, many and
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other where other is an implicit default. Rules should be mutually
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exclusive; for a given numeric value, only one rule should apply (i.e.
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the condition should only be true for one of the plural rule elements.
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"""
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__slots__ = ('abstract', '_func')
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def __init__(self, rules):
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"""Initialize the rule instance.
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:param rules: a list of ``(tag, expr)``) tuples with the rules
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conforming to UTS #35 or a dict with the tags as keys
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and expressions as values.
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:raise RuleError: if the expression is malformed
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"""
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if isinstance(rules, dict):
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rules = rules.items()
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found = set()
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self.abstract = []
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for key, expr in sorted(list(rules)):
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if key not in _plural_tags:
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raise ValueError('unknown tag %r' % key)
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elif key in found:
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raise ValueError('tag %r defined twice' % key)
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found.add(key)
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self.abstract.append((key, _Parser(expr).ast))
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def __repr__(self):
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rules = self.rules
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return '<%s %r>' % (
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type(self).__name__,
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', '.join(['%s: %s' % (tag, rules[tag]) for tag in _plural_tags
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if tag in rules])
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)
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@classmethod
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def parse(cls, rules):
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"""Create a `PluralRule` instance for the given rules. If the rules
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are a `PluralRule` object, that object is returned.
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:param rules: the rules as list or dict, or a `PluralRule` object
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:raise RuleError: if the expression is malformed
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"""
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if isinstance(rules, cls):
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return rules
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return cls(rules)
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@property
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def rules(self):
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"""The `PluralRule` as a dict of unicode plural rules.
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>>> rule = PluralRule({'one': 'n is 1'})
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>>> rule.rules
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{'one': 'n is 1'}
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"""
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_compile = _UnicodeCompiler().compile
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return dict([(tag, _compile(ast)) for tag, ast in self.abstract])
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tags = property(lambda x: frozenset([i[0] for i in x.abstract]), doc="""
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A set of explicitly defined tags in this rule. The implicit default
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``'other'`` rules is not part of this set unless there is an explicit
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rule for it.""")
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def __getstate__(self):
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return self.abstract
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def __setstate__(self, abstract):
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self.abstract = abstract
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def __call__(self, n):
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if not hasattr(self, '_func'):
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self._func = to_python(self)
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return self._func(n)
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def to_javascript(rule):
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"""Convert a list/dict of rules or a `PluralRule` object into a JavaScript
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function. This function depends on no external library:
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>>> to_javascript({'one': 'n is 1'})
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"(function(n) { return (n == 1) ? 'one' : 'other'; })"
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Implementation detail: The function generated will probably evaluate
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expressions involved into range operations multiple times. This has the
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advantage that external helper functions are not required and is not a
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big performance hit for these simple calculations.
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:param rule: the rules as list or dict, or a `PluralRule` object
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:raise RuleError: if the expression is malformed
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"""
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to_js = _JavaScriptCompiler().compile
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result = ['(function(n) { return ']
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for tag, ast in PluralRule.parse(rule).abstract:
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result.append('%s ? %r : ' % (to_js(ast), tag))
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result.append('%r; })' % _fallback_tag)
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return ''.join(result)
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def to_python(rule):
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"""Convert a list/dict of rules or a `PluralRule` object into a regular
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Python function. This is useful in situations where you need a real
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function and don't are about the actual rule object:
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>>> func = to_python({'one': 'n is 1', 'few': 'n in 2..4'})
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>>> func(1)
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'one'
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>>> func(3)
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'few'
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>>> func = to_python({'one': 'n in 1,11', 'few': 'n in 3..10,13..19'})
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>>> func(11)
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'one'
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>>> func(15)
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'few'
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:param rule: the rules as list or dict, or a `PluralRule` object
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:raise RuleError: if the expression is malformed
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"""
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namespace = {
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'IN': in_range_list,
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'WITHIN': within_range_list,
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'MOD': cldr_modulo
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}
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to_python = _PythonCompiler().compile
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result = ['def evaluate(n):']
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for tag, ast in PluralRule.parse(rule).abstract:
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# the str() call is to coerce the tag to the native string. It's
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# a limited ascii restricted set of tags anyways so that is fine.
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result.append(' if (%s): return %r' % (to_python(ast), str(tag)))
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result.append(' return %r' % _fallback_tag)
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code = compile('\n'.join(result), '<rule>', 'exec')
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eval(code, namespace)
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return namespace['evaluate']
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def to_gettext(rule):
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"""The plural rule as gettext expression. The gettext expression is
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technically limited to integers and returns indices rather than tags.
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>>> to_gettext({'one': 'n is 1', 'two': 'n is 2'})
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'nplurals=3; plural=((n == 1) ? 0 : (n == 2) ? 1 : 2)'
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:param rule: the rules as list or dict, or a `PluralRule` object
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:raise RuleError: if the expression is malformed
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"""
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rule = PluralRule.parse(rule)
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used_tags = rule.tags | set([_fallback_tag])
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_compile = _GettextCompiler().compile
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_get_index = [tag for tag in _plural_tags if tag in used_tags].index
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result = ['nplurals=%d; plural=(' % len(used_tags)]
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for tag, ast in rule.abstract:
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result.append('%s ? %d : ' % (_compile(ast), _get_index(tag)))
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result.append('%d)' % _get_index(_fallback_tag))
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return ''.join(result)
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def in_range_list(num, range_list):
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"""Integer range list test. This is the callback for the "in" operator
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of the UTS #35 pluralization rule language:
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>>> in_range_list(1, [(1, 3)])
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True
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>>> in_range_list(3, [(1, 3)])
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True
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>>> in_range_list(3, [(1, 3), (5, 8)])
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True
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>>> in_range_list(1.2, [(1, 4)])
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False
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>>> in_range_list(10, [(1, 4)])
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False
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>>> in_range_list(10, [(1, 4), (6, 8)])
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False
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"""
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return num == int(num) and within_range_list(num, range_list)
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def within_range_list(num, range_list):
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"""Float range test. This is the callback for the "within" operator
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of the UTS #35 pluralization rule language:
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>>> within_range_list(1, [(1, 3)])
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True
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>>> within_range_list(1.0, [(1, 3)])
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True
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>>> within_range_list(1.2, [(1, 4)])
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True
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>>> within_range_list(8.8, [(1, 4), (7, 15)])
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True
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>>> within_range_list(10, [(1, 4)])
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False
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>>> within_range_list(10.5, [(1, 4), (20, 30)])
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False
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"""
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return any(num >= min_ and num <= max_ for min_, max_ in range_list)
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def cldr_modulo(a, b):
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"""Javaish modulo. This modulo operator returns the value with the sign
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of the dividend rather than the divisor like Python does:
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>>> cldr_modulo(-3, 5)
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-3
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>>> cldr_modulo(-3, -5)
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-3
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>>> cldr_modulo(3, 5)
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3
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"""
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reverse = 0
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if a < 0:
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a *= -1
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reverse = 1
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if b < 0:
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b *= -1
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rv = a % b
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if reverse:
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rv *= -1
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return rv
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class RuleError(Exception):
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"""Raised if a rule is malformed."""
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class _Parser(object):
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"""Internal parser. This class can translate a single rule into an abstract
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tree of tuples. It implements the following grammar::
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condition = and_condition ('or' and_condition)*
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and_condition = relation ('and' relation)*
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relation = is_relation | in_relation | within_relation | 'n' <EOL>
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is_relation = expr 'is' ('not')? value
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in_relation = expr ('not')? 'in' range_list
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within_relation = expr ('not')? 'within' range_list
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expr = 'n' ('mod' value)?
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range_list = (range | value) (',' range_list)*
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value = digit+
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digit = 0|1|2|3|4|5|6|7|8|9
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range = value'..'value
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- Whitespace can occur between or around any of the above tokens.
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- Rules should be mutually exclusive; for a given numeric value, only one
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rule should apply (i.e. the condition should only be true for one of
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the plural rule elements).
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- The in and within relations can take comma-separated lists, such as:
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'n in 3,5,7..15'.
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The translator parses the expression on instanciation into an attribute
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called `ast`.
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"""
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_rules = [
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(None, re.compile(r'\s+(?u)')),
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('word', re.compile(r'\b(and|or|is|(?:with)?in|not|mod|n)\b')),
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('value', re.compile(r'\d+')),
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('comma', re.compile(r',')),
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('ellipsis', re.compile(r'\.\.'))
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]
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def __init__(self, string):
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string = string.lower()
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result = []
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pos = 0
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end = len(string)
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while pos < end:
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for tok, rule in self._rules:
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match = rule.match(string, pos)
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if match is not None:
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pos = match.end()
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if tok:
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result.append((tok, match.group()))
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break
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else:
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raise RuleError('malformed CLDR pluralization rule. '
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'Got unexpected %r' % string[pos])
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self.tokens = result[::-1]
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self.ast = self.condition()
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if self.tokens:
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raise RuleError('Expected end of rule, got %r' %
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self.tokens[-1][1])
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def test(self, type, value=None):
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return self.tokens and self.tokens[-1][0] == type and \
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(value is None or self.tokens[-1][1] == value)
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def skip(self, type, value=None):
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if self.test(type, value):
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return self.tokens.pop()
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def expect(self, type, value=None, term=None):
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token = self.skip(type, value)
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if token is not None:
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return token
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if term is None:
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term = repr(value is None and type or value)
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if not self.tokens:
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raise RuleError('expected %s but end of rule reached' % term)
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raise RuleError('expected %s but got %r' % (term, self.tokens[-1][1]))
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def condition(self):
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op = self.and_condition()
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while self.skip('word', 'or'):
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op = 'or', (op, self.and_condition())
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return op
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def and_condition(self):
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op = self.relation()
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while self.skip('word', 'and'):
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op = 'and', (op, self.relation())
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return op
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def relation(self):
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left = self.expr()
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if self.skip('word', 'is'):
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return self.skip('word', 'not') and 'isnot' or 'is', \
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(left, self.value())
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negated = self.skip('word', 'not')
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method = 'in'
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if self.skip('word', 'within'):
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method = 'within'
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else:
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self.expect('word', 'in', term="'within' or 'in'")
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rv = 'relation', (method, left, self.range_list())
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if negated:
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rv = 'not', (rv,)
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return rv
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def range_or_value(self):
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left = self.value()
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if self.skip('ellipsis'):
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return((left, self.value()))
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else:
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return((left, left))
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def range_list(self):
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range_list = [self.range_or_value()]
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while self.skip('comma'):
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range_list.append(self.range_or_value())
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return 'range_list', range_list
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def expr(self):
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self.expect('word', 'n')
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if self.skip('word', 'mod'):
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return 'mod', (('n', ()), self.value())
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return 'n', ()
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def value(self):
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return 'value', (int(self.expect('value')[1]),)
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def _binary_compiler(tmpl):
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"""Compiler factory for the `_Compiler`."""
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return lambda self, l, r: tmpl % (self.compile(l), self.compile(r))
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def _unary_compiler(tmpl):
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"""Compiler factory for the `_Compiler`."""
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return lambda self, x: tmpl % self.compile(x)
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class _Compiler(object):
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"""The compilers are able to transform the expressions into multiple
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output formats.
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"""
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def compile(self, arg):
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op, args = arg
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return getattr(self, 'compile_' + op)(*args)
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compile_n = lambda x: 'n'
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compile_value = lambda x, v: str(v)
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compile_and = _binary_compiler('(%s && %s)')
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compile_or = _binary_compiler('(%s || %s)')
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compile_not = _unary_compiler('(!%s)')
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compile_mod = _binary_compiler('(%s %% %s)')
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compile_is = _binary_compiler('(%s == %s)')
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compile_isnot = _binary_compiler('(%s != %s)')
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def compile_relation(self, method, expr, range_list):
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raise NotImplementedError()
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class _PythonCompiler(_Compiler):
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"""Compiles an expression to Python."""
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compile_and = _binary_compiler('(%s and %s)')
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compile_or = _binary_compiler('(%s or %s)')
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compile_not = _unary_compiler('(not %s)')
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compile_mod = _binary_compiler('MOD(%s, %s)')
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def compile_relation(self, method, expr, range_list):
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compile_range_list = '[%s]' % ','.join(
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['(%s, %s)' % tuple(map(self.compile, range_))
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for range_ in range_list[1]])
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return '%s(%s, %s)' % (method.upper(), self.compile(expr),
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compile_range_list)
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class _GettextCompiler(_Compiler):
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"""Compile into a gettext plural expression."""
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def compile_relation(self, method, expr, range_list):
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rv = []
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expr = self.compile(expr)
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for item in range_list[1]:
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if item[0] == item[1]:
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rv.append('(%s == %s)' % (
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expr,
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self.compile(item[0])
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))
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else:
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min, max = map(self.compile, item)
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rv.append('(%s >= %s && %s <= %s)' % (
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expr,
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min,
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expr,
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max
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))
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return '(%s)' % ' || '.join(rv)
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class _JavaScriptCompiler(_GettextCompiler):
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"""Compiles the expression to plain of JavaScript."""
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def compile_relation(self, method, expr, range_list):
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code = _GettextCompiler.compile_relation(
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self, method, expr, range_list)
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if method == 'in':
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expr = self.compile(expr)
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code = '(parseInt(%s) == %s && %s)' % (expr, expr, code)
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return code
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class _UnicodeCompiler(_Compiler):
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"""Returns a unicode pluralization rule again."""
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compile_is = _binary_compiler('%s is %s')
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compile_isnot = _binary_compiler('%s is not %s')
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compile_and = _binary_compiler('%s and %s')
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compile_or = _binary_compiler('%s or %s')
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compile_mod = _binary_compiler('%s mod %s')
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def compile_not(self, relation):
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return self.compile_relation(negated=True, *relation[1])
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def compile_relation(self, method, expr, range_list, negated=False):
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ranges = []
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for item in range_list[1]:
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if item[0] == item[1]:
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ranges.append(self.compile(item[0]))
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else:
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ranges.append('%s..%s' % tuple(map(self.compile, item)))
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return '%s%s %s %s' % (
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self.compile(expr), negated and ' not' or '',
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method, ','.join(ranges)
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)
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