/usr/share/pyshared/classytags/arguments.py is in python-django-classy-tags 0.3.4.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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from classytags.utils import TemplateConstant, NULL, mixin
from classytags.values import (StringValue, IntegerValue, ListValue, ChoiceValue,
DictValue, StrictStringValue)
from django import template
from django.core.exceptions import ImproperlyConfigured
class Argument(object):
"""
A basic single value argument.
"""
value_class = StringValue
def __init__(self, name, default=None, required=True, resolve=True):
self.name = name
self.default = default
self.required = required
self.resolve = resolve
def __repr__(self): # pragma: no cover
return '<%s: %s>' % (self.__class__.__name__, self.name)
def get_default(self):
"""
Get the default value
"""
return TemplateConstant(self.default)
def parse_token(self, parser, token):
if self.resolve:
return parser.compile_filter(token)
else:
return TemplateConstant(token)
def parse(self, parser, token, tagname, kwargs):
"""
Parse a token.
"""
if self.name in kwargs:
return False
else:
value = self.parse_token(parser, token)
kwargs[self.name] = self.value_class(value)
return True
class StringArgument(Argument):
value_class = StrictStringValue
class KeywordArgument(Argument):
"""
A single 'key=value' argument
"""
wrapper_class = DictValue
def __init__(self, name, default=None, required=True, resolve=True,
defaultkey=None, splitter='='):
super(KeywordArgument, self).__init__(name, default, required, resolve)
self.defaultkey = defaultkey
self.splitter = splitter
def get_default(self):
if self.defaultkey:
return self.wrapper_class({
self.defaultkey: TemplateConstant(self.default)
})
else:
return self.wrapper_class({})
def parse_token(self, parser, token):
if self.splitter in token:
key, raw_value = token.split(self.splitter, 1)
value = super(KeywordArgument, self).parse_token(parser, raw_value)
else:
key = self.defaultkey
value = super(KeywordArgument, self).parse_token(parser, token)
return key, self.value_class(value)
def parse(self, parser, token, tagname, kwargs):
if self.name in kwargs: # pragma: no cover
return False
else:
key, value = self.parse_token(parser, token)
kwargs[self.name] = self.wrapper_class({
key: value
})
return True
class IntegerArgument(Argument):
"""
Same as Argument but converts the value to integers.
"""
value_class = IntegerValue
class ChoiceArgument(Argument):
"""
An Argument which checks if it's value is in a predefined list of choices.
"""
def __init__(self, name, choices, default=None, required=True,
resolve=True):
super(ChoiceArgument, self).__init__(name, default, required, resolve)
if default or not required:
value_on_error = default
else:
value_on_error = choices[0]
self.value_class = mixin(
self.value_class,
ChoiceValue,
attrs={
'choices': choices,
'value_on_error': value_on_error,
}
)
class MultiValueArgument(Argument):
"""
An argument which allows multiple values.
"""
sequence_class = ListValue
value_class = StringValue
def __init__(self, name, default=NULL, required=True, max_values=None,
resolve=True):
self.max_values = max_values
if default is NULL:
default = []
else:
required = False
super(MultiValueArgument, self).__init__(name, default, required,
resolve)
def parse(self, parser, token, tagname, kwargs):
"""
Parse a token.
"""
value = self.value_class(self.parse_token(parser, token))
if self.name in kwargs:
if self.max_values and len(kwargs[self.name]) == self.max_values:
return False
kwargs[self.name].append(value)
else:
kwargs[self.name] = self.sequence_class(value)
return True
class MultiKeywordArgument(KeywordArgument):
def __init__(self, name, default=None, required=True, resolve=True,
max_values=None, splitter='='):
if not default:
default = {}
else:
default = dict(default)
super(MultiKeywordArgument, self).__init__(name, default, required,
resolve, NULL, splitter)
self.max_values = max_values
def get_default(self):
items = self.default.items()
return self.wrapper_class(
dict([(key, TemplateConstant(value)) for key, value in items])
)
def parse(self, parser, token, tagname, kwargs):
key, value = self.parse_token(parser, token)
if key is NULL:
raise template.TemplateSyntaxError(
"MultiKeywordArgument arguments require key=value pairs"
)
if self.name in kwargs:
if self.max_values and len(kwargs[self.name]) == self.max_values:
return False
kwargs[self.name][key] = value
else:
kwargs[self.name] = self.wrapper_class({
key: value
})
return True
class Flag(Argument):
"""
A boolean flag
"""
def __init__(self, name, default=NULL, true_values=None, false_values=None,
case_sensitive=False):
if default is not NULL:
required = False
else:
required = True
super(Flag, self).__init__(name, default, required)
if true_values is None:
true_values = []
if false_values is None:
false_values = []
if case_sensitive:
self.mod = lambda x: x
else:
self.mod = lambda x: str(x).lower()
self.true_values = [self.mod(tv) for tv in true_values]
self.false_values = [self.mod(fv) for fv in false_values]
if not any([self.true_values, self.false_values]):
raise ImproperlyConfigured(
"Flag must specify either true_values and/or false_values"
)
def parse(self, parser, token, tagname, kwargs):
"""
Parse a token.
"""
ltoken = self.mod(token)
if self.name in kwargs:
return False
if self.true_values and ltoken in self.true_values:
kwargs[self.name] = TemplateConstant(True)
elif self.false_values and ltoken in self.false_values:
kwargs[self.name] = TemplateConstant(False)
elif self.default is NULL:
allowed_values = []
if self.true_values:
allowed_values += self.true_values
if self.false_values:
allowed_values += self.false_values
raise InvalidFlag(self.name, token, allowed_values, tagname)
else:
kwargs[self.name] = self.get_default()
return True
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