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exceptions.py
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# -*- coding: utf-8 -*- from ._compat import imap from ._compat import implements_to_string from ._compat import PY2 from ._compat import text_type class TemplateError(Exception): """Baseclass for all template errors.""" if PY2: def __init__(self, message=None): if message is not None: message = text_type(message).encode("utf-8") Exception.__init__(self, message) @property def message(self): if self.args: message = self.args[0] if message is not None: return message.decode("utf-8", "replace") def __unicode__(self): return self.message or u"" else: def __init__(self, message=None): Exception.__init__(self, message) @property def message(self): if self.args: message = self.args[0] if message is not None: return message @implements_to_string class TemplateNotFound(IOError, LookupError, TemplateError): """Raised if a template does not exist. .. versionchanged:: 2.11 If the given name is :class:`Undefined` and no message was provided, an :exc:`UndefinedError` is raised. """ # looks weird, but removes the warning descriptor that just # bogusly warns us about message being deprecated message = None def __init__(self, name, message=None): IOError.__init__(self, name) if message is None: from .runtime import Undefined if isinstance(name, Undefined): name._fail_with_undefined_error() message = name self.message = message self.name = name self.templates = [name] def __str__(self): return self.message class TemplatesNotFound(TemplateNotFound): """Like :class:`TemplateNotFound` but raised if multiple templates are selected. This is a subclass of :class:`TemplateNotFound` exception, so just catching the base exception will catch both. .. versionchanged:: 2.11 If a name in the list of names is :class:`Undefined`, a message about it being undefined is shown rather than the empty string. .. versionadded:: 2.2 """ def __init__(self, names=(), message=None): if message is None: from .runtime import Undefined parts = [] for name in names: if isinstance(name, Undefined): parts.append(name._undefined_message) else: parts.append(name) message = u"none of the templates given were found: " + u", ".join( imap(text_type, parts) ) TemplateNotFound.__init__(self, names and names[-1] or None, message) self.templates = list(names) @implements_to_string class TemplateSyntaxError(TemplateError): """Raised to tell the user that there is a problem with the template.""" def __init__(self, message, lineno, name=None, filename=None): TemplateError.__init__(self, message) self.lineno = lineno self.name = name self.filename = filename self.source = None # this is set to True if the debug.translate_syntax_error # function translated the syntax error into a new traceback self.translated = False def __str__(self): # for translated errors we only return the message if self.translated: return self.message # otherwise attach some stuff location = "line %d" % self.lineno name = self.filename or self.name if name: location = 'File "%s", %s' % (name, location) lines = [self.message, " " + location] # if the source is set, add the line to the output if self.source is not None: try: line = self.source.splitlines()[self.lineno - 1] except IndexError: line = None if line: lines.append(" " + line.strip()) return u"\n".join(lines) def __reduce__(self): # https://bugs.python.org/issue1692335 Exceptions that take # multiple required arguments have problems with pickling. # Without this, raises TypeError: __init__() missing 1 required # positional argument: 'lineno' return self.__class__, (self.message, self.lineno, self.name, self.filename) class TemplateAssertionError(TemplateSyntaxError): """Like a template syntax error, but covers cases where something in the template caused an error at compile time that wasn't necessarily caused by a syntax error. However it's a direct subclass of :exc:`TemplateSyntaxError` and has the same attributes. """ class TemplateRuntimeError(TemplateError): """A generic runtime error in the template engine. Under some situations Jinja may raise this exception. """ class UndefinedError(TemplateRuntimeError): """Raised if a template tries to operate on :class:`Undefined`.""" class SecurityError(TemplateRuntimeError): """Raised if a template tries to do something insecure if the sandbox is enabled. """ class FilterArgumentError(TemplateRuntimeError): """This error is raised if a filter was called with inappropriate arguments """