Runtime helpers.
- :copyright: Copyright 2008 by Armin Ronacher.
+ :copyright: (c) 2010 by the Jinja Team.
:license: BSD.
"""
-import sys
from itertools import chain, imap
+from jinja2.nodes import EvalContext, _context_function_types
from jinja2.utils import Markup, partial, soft_unicode, escape, missing, \
- concat, MethodType, FunctionType
-from jinja2.exceptions import UndefinedError, TemplateRuntimeError
+ concat, internalcode, next, object_type_repr
+from jinja2.exceptions import UndefinedError, TemplateRuntimeError, \
+ TemplateNotFound
# these variables are exported to the template runtime
-__all__ = ['LoopContext', 'Context', 'TemplateReference', 'Macro', 'Markup',
+__all__ = ['LoopContext', 'TemplateReference', 'Macro', 'Markup',
'TemplateRuntimeError', 'missing', 'concat', 'escape',
- 'markup_join', 'unicode_join']
+ 'markup_join', 'unicode_join', 'to_string', 'identity',
+ 'TemplateNotFound']
+#: the name of the function that is used to convert something into
+#: a string. 2to3 will adopt that automatically and the generated
+#: code can take advantage of it.
+to_string = unicode
-#: the types we support for context functions
-_context_function_types = (FunctionType, MethodType)
+#: the identity function. Useful for certain things in the environment
+identity = lambda x: x
def markup_join(seq):
return concat(imap(unicode, seq))
+def new_context(environment, template_name, blocks, vars=None,
+ shared=None, globals=None, locals=None):
+ """Internal helper to for context creation."""
+ if vars is None:
+ vars = {}
+ if shared:
+ parent = vars
+ else:
+ parent = dict(globals or (), **vars)
+ if locals:
+ # if the parent is shared a copy should be created because
+ # we don't want to modify the dict passed
+ if shared:
+ parent = dict(parent)
+ for key, value in locals.iteritems():
+ if key[:2] == 'l_' and value is not missing:
+ parent[key[2:]] = value
+ return Context(environment, parent, template_name, blocks)
+
+
+class TemplateReference(object):
+ """The `self` in templates."""
+
+ def __init__(self, context):
+ self.__context = context
+
+ def __getitem__(self, name):
+ blocks = self.__context.blocks[name]
+ return BlockReference(name, self.__context, blocks, 0)
+
+ def __repr__(self):
+ return '<%s %r>' % (
+ self.__class__.__name__,
+ self.__context.name
+ )
+
+
class Context(object):
"""The template context holds the variables of a template. It stores the
values passed to the template and also the names the template exports.
method that doesn't fail with a `KeyError` but returns an
:class:`Undefined` object for missing variables.
"""
- __slots__ = ('parent', 'vars', 'environment', 'exported_vars', 'name',
- 'blocks', '__weakref__')
+ __slots__ = ('parent', 'vars', 'environment', 'eval_ctx', 'exported_vars',
+ 'name', 'blocks', '__weakref__')
def __init__(self, environment, parent, name, blocks):
self.parent = parent
- self.vars = vars = {}
+ self.vars = {}
self.environment = environment
+ self.eval_ctx = EvalContext(self.environment, name)
self.exported_vars = set()
self.name = name
"""
return dict(self.parent, **self.vars)
+ @internalcode
def call(__self, __obj, *args, **kwargs):
"""Call the callable with the arguments and keyword arguments
provided but inject the active context or environment as first
if isinstance(__obj, _context_function_types):
if getattr(__obj, 'contextfunction', 0):
args = (__self,) + args
+ elif getattr(__obj, 'evalcontextfunction', 0):
+ args = (__self.eval_ctx,) + args
elif getattr(__obj, 'environmentfunction', 0):
args = (__self.environment,) + args
- return __obj(*args, **kwargs)
+ try:
+ return __obj(*args, **kwargs)
+ except StopIteration:
+ return __self.environment.undefined('value was undefined because '
+ 'a callable raised a '
+ 'StopIteration exception')
+
+ def derived(self, locals=None):
+ """Internal helper function to create a derived context."""
+ context = new_context(self.environment, self.name, {},
+ self.parent, True, None, locals)
+ context.vars.update(self.vars)
+ context.eval_ctx = self.eval_ctx
+ context.blocks.update((k, list(v)) for k, v in self.blocks.iteritems())
+ return context
def _all(meth):
proxy = lambda self: getattr(self.get_all(), meth)()
keys = _all('keys')
values = _all('values')
items = _all('items')
- iterkeys = _all('iterkeys')
- itervalues = _all('itervalues')
- iteritems = _all('iteritems')
+
+ # not available on python 3
+ if hasattr(dict, 'iterkeys'):
+ iterkeys = _all('iterkeys')
+ itervalues = _all('itervalues')
+ iteritems = _all('iteritems')
del _all
def __contains__(self, name):
pass
-class TemplateReference(object):
- """The `self` in templates."""
-
- def __init__(self, context):
- self.__context = context
-
- def __getitem__(self, name):
- blocks = self.__context.blocks[name]
- wrap = self.__context.environment.autoescape and \
- Markup or (lambda x: x)
- return BlockReference(name, self.__context, blocks, 0)
-
- def __repr__(self):
- return '<%s %r>' % (
- self.__class__.__name__,
- self.__context.name
- )
-
-
class BlockReference(object):
"""One block on a template reference."""
return BlockReference(self.name, self._context, self._stack,
self._depth + 1)
+ @internalcode
def __call__(self):
rv = concat(self._stack[self._depth](self._context))
- if self._context.environment.autoescape:
+ if self._context.eval_ctx.autoescape:
rv = Markup(rv)
return rv
def __iter__(self):
return LoopContextIterator(self)
+ @internalcode
def loop(self, iterable):
if self._recurse is None:
raise TypeError('Tried to call non recursive loop. Maybe you '
# a nifty trick to enhance the error message if someone tried to call
# the the loop without or with too many arguments.
- __call__ = loop; del loop
+ __call__ = loop
+ del loop
@property
def length(self):
def next(self):
ctx = self.context
ctx.index0 += 1
- return ctx._iterator.next(), ctx
+ return next(ctx._iterator), ctx
class Macro(object):
- """Wraps a macro."""
+ """Wraps a macro function."""
def __init__(self, environment, func, name, arguments, defaults,
catch_kwargs, catch_varargs, caller):
self.catch_varargs = catch_varargs
self.caller = caller
+ @internalcode
def __call__(self, *args, **kwargs):
- arguments = []
- for idx, name in enumerate(self.arguments):
- try:
- value = args[idx]
- except:
+ # try to consume the positional arguments
+ arguments = list(args[:self._argument_count])
+ off = len(arguments)
+
+ # if the number of arguments consumed is not the number of
+ # arguments expected we start filling in keyword arguments
+ # and defaults.
+ if off != self._argument_count:
+ for idx, name in enumerate(self.arguments[len(arguments):]):
try:
value = kwargs.pop(name)
- except:
+ except KeyError:
try:
- value = self.defaults[idx - self._argument_count]
- except:
+ value = self.defaults[idx - self._argument_count + off]
+ except IndexError:
value = self._environment.undefined(
'parameter %r was not provided' % name, name=name)
- arguments.append(value)
+ arguments.append(value)
# it's important that the order of these arguments does not change
# if not also changed in the compiler's `function_scoping` method.
arguments.append(kwargs)
elif kwargs:
raise TypeError('macro %r takes no keyword argument %r' %
- (self.name, iter(kwargs).next()))
+ (self.name, next(iter(kwargs))))
if self.catch_varargs:
arguments.append(args[self._argument_count:])
elif len(args) > self._argument_count:
__slots__ = ('_undefined_hint', '_undefined_obj', '_undefined_name',
'_undefined_exception')
- def __init__(self, hint=None, obj=None, name=None, exc=UndefinedError):
+ def __init__(self, hint=None, obj=missing, name=None, exc=UndefinedError):
self._undefined_hint = hint
self._undefined_obj = obj
self._undefined_name = name
self._undefined_exception = exc
+ @internalcode
def _fail_with_undefined_error(self, *args, **kwargs):
"""Regular callback function for undefined objects that raises an
`UndefinedError` on call.
"""
if self._undefined_hint is None:
- if self._undefined_obj is None:
+ if self._undefined_obj is missing:
hint = '%r is undefined' % self._undefined_name
elif not isinstance(self._undefined_name, basestring):
- hint = '%r object has no element %r' % (
- self._undefined_obj.__class__.__name__,
+ hint = '%s has no element %r' % (
+ object_type_repr(self._undefined_obj),
self._undefined_name
)
else:
- hint = '%r object has no attribute %r' % (
- self._undefined_obj.__class__.__name__,
+ hint = '%r has no attribute %r' % (
+ object_type_repr(self._undefined_obj),
self._undefined_name
)
else:
hint = self._undefined_hint
raise self._undefined_exception(hint)
+ @internalcode
+ def __getattr__(self, name):
+ if name[:2] == '__':
+ raise AttributeError(name)
+ return self._fail_with_undefined_error()
+
__add__ = __radd__ = __mul__ = __rmul__ = __div__ = __rdiv__ = \
__truediv__ = __rtruediv__ = __floordiv__ = __rfloordiv__ = \
__mod__ = __rmod__ = __pos__ = __neg__ = __call__ = \
- __getattr__ = __getitem__ = __lt__ = __le__ = __gt__ = __ge__ = \
- __int__ = __float__ = __complex__ = __pow__ = __rpow__ = \
+ __getitem__ = __lt__ = __le__ = __gt__ = __ge__ = __int__ = \
+ __float__ = __complex__ = __pow__ = __rpow__ = \
_fail_with_undefined_error
def __str__(self):
return unicode(self).encode('utf-8')
+ # unicode goes after __str__ because we configured 2to3 to rename
+ # __unicode__ to __str__. because the 2to3 tree is not designed to
+ # remove nodes from it, we leave the above __str__ around and let
+ # it override at runtime.
def __unicode__(self):
return u''
def __unicode__(self):
if self._undefined_hint is None:
- if self._undefined_obj is None:
+ if self._undefined_obj is missing:
return u'{{ %s }}' % self._undefined_name
return '{{ no such element: %s[%r] }}' % (
- self._undefined_obj.__class__.__name__,
+ object_type_repr(self._undefined_obj),
self._undefined_name
)
return u'{{ undefined value printed: %s }}' % self._undefined_hint
UndefinedError: 'foo' is undefined
"""
__slots__ = ()
- __iter__ = __unicode__ = __len__ = __nonzero__ = __eq__ = __ne__ = \
- Undefined._fail_with_undefined_error
+ __iter__ = __unicode__ = __str__ = __len__ = __nonzero__ = __eq__ = \
+ __ne__ = __bool__ = Undefined._fail_with_undefined_error
# remove remaining slots attributes, after the metaclass did the magic they
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