Viewing file:  exceptions.py (4.95 KB) -rw-r--r--
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import typing as t
if t.TYPE_CHECKING:
from .runtime import Undefined
class TemplateError(Exception):
"""Baseclass for all template errors."""
def __init__(self, message: t.Optional[str] = None) -> None:
super().__init__(message)
@property
def message(self) -> t.Optional[str]:
return self.args[0] if self.args else None
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.
"""
# Silence the Python warning about message being deprecated since
# it's not valid here.
message: t.Optional[str] = None
def __init__(
self,
name: t.Optional[t.Union[str, "Undefined"]],
message: t.Optional[str] = None,
) -> 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) -> str:
return str(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: t.Sequence[t.Union[str, "Undefined"]] = (),
message: t.Optional[str] = None,
) -> 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)
parts_str = ", ".join(map(str, parts))
message = f"none of the templates given were found: {parts_str}"
super().__init__(names[-1] if names else None, message)
self.templates = list(names)
class TemplateSyntaxError(TemplateError):
"""Raised to tell the user that there is a problem with the template."""
def __init__(
self,
message: str,
lineno: int,
name: t.Optional[str] = None,
filename: t.Optional[str] = None,
) -> None:
super().__init__(message)
self.lineno = lineno
self.name = name
self.filename = filename
self.source: t.Optional[str] = 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) -> str:
# for translated errors we only return the message
if self.translated:
return t.cast(str, self.message)
# otherwise attach some stuff
location = f"line {self.lineno}"
name = self.filename or self.name
if name:
location = f'File "{name}", {location}'
lines = [t.cast(str, 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:
pass
else:
lines.append(" " + line.strip())
return "\n".join(lines)
def __reduce__(self): # type: ignore
# 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
"""
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