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Edit File: exceptions.py

# -*- coding: utf-8 -*-
"""
    jinja2.exceptions
    ~~~~~~~~~~~~~~~~~

Jinja exceptions.

:copyright: (c) 2017 by the Jinja Team.
    :license: BSD, see LICENSE for more details.
"""
from jinja2._compat import imap, text_type, PY2, implements_to_string

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."""

# 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)
        if message is None:
            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.

.. versionadded:: 2.2
    """

def __init__(self, names=(), message=None):
        if message is None:
            message = u'none of the templates given were found: ' + \
                      u', '.join(imap(text_type, names))
        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)

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
    """