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import warnings
from django import template
from django.conf import settings
from classytags.exceptions import TemplateSyntaxWarning
class StringValue:
errors = {}
value_on_error = ""
def __init__(self, var):
self.var = var
try:
# django.template.base.Variable
self.literal = self.var.literal
except AttributeError:
# django.template.base.FilterExpression
self.literal = self.var.token
def resolve(self, context):
resolved = self.var.resolve(context)
return self.clean(resolved)
def clean(self, value):
return value
def error(self, value, category):
data = self.get_extra_error_data()
data['value'] = repr(value)
message = self.errors.get(category, "") % data
if settings.DEBUG:
raise template.TemplateSyntaxError(message)
else:
warnings.warn(message, TemplateSyntaxWarning)
return self.value_on_error
def get_extra_error_data(self):
return {}
class StrictStringValue(StringValue):
errors = {
"clean": "%(value)s is not a string",
}
value_on_error = ""
def clean(self, value):
if not isinstance(value, str):
return self.error(value, "clean")
return value
class IntegerValue(StringValue):
errors = {
"clean": "%(value)s could not be converted to Integer",
}
value_on_error = 0
def clean(self, value):
try:
return int(value)
except ValueError:
return self.error(value, "clean")
class ListValue(list, StringValue):
"""
A list of template variables for easy resolving
"""
def __init__(self, value):
list.__init__(self)
self.append(value)
def resolve(self, context):
resolved = [item.resolve(context) for item in self]
return self.clean(resolved)
class DictValue(dict, StringValue):
def __init__(self, value):
dict.__init__(self, value)
def resolve(self, context):
resolved = {
key: value.resolve(context) for key, value in self.items()
}
return self.clean(resolved)
class ChoiceValue(StringValue):
errors = {
"choice": "%(value)s is not a valid choice. Valid choices: "
"%(choices)s.",
}
choices = []
def clean(self, value):
cleaned = super().clean(value)
if cleaned in self.choices:
return cleaned
else:
return self.error(cleaned, "choice")
def get_extra_error_data(self):
data = super().get_extra_error_data()
data['choices'] = self.choices
return data
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