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# -*- coding: utf-8 -*- """ jinja2.runtime ~~~~~~~~~~~~~~ Runtime helpers. :copyright: (c) 2010 by the Jinja Team. :license: BSD. """ from itertools import chain from jinja2.nodes import EvalContext, _context_function_types from jinja2.utils import Markup, soft_unicode, escape, missing, concat, \ internalcode, object_type_repr from jinja2.exceptions import UndefinedError, TemplateRuntimeError, \ TemplateNotFound from jinja2._compat import next, imap, text_type, iteritems, \ implements_iterator, implements_to_string, string_types, PY2 # these variables are exported to the template runtime __all__ = ['LoopContext', 'TemplateReference', 'Macro', 'Markup', 'TemplateRuntimeError', 'missing', 'concat', 'escape', 'markup_join', 'unicode_join', 'to_string', 'identity', 'TemplateNotFound'] #: the name of the function that is used to convert something into #: a string. We can just use the text type here. to_string = text_type #: the identity function. Useful for certain things in the environment identity = lambda x: x _last_iteration = object() def markup_join(seq): """Concatenation that escapes if necessary and converts to unicode.""" buf = [] iterator = imap(soft_unicode, seq) for arg in iterator: buf.append(arg) if hasattr(arg, '__html__'): return Markup(u'').join(chain(buf, iterator)) return concat(buf) def unicode_join(seq): """Simple args to unicode conversion and concatenation.""" return concat(imap(text_type, 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 iteritems(locals): 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. Creating instances is neither supported nor useful as it's created automatically at various stages of the template evaluation and should not be created by hand. The context is immutable. Modifications on :attr:`parent` **must not** happen and modifications on :attr:`vars` are allowed from generated template code only. Template filters and global functions marked as :func:`contextfunction`\s get the active context passed as first argument and are allowed to access the context read-only. The template context supports read only dict operations (`get`, `keys`, `values`, `items`, `iterkeys`, `itervalues`, `iteritems`, `__getitem__`, `__contains__`). Additionally there is a :meth:`resolve` method that doesn't fail with a `KeyError` but returns an :class:`Undefined` object for missing variables. """ __slots__ = ('parent', 'vars', 'environment', 'eval_ctx', 'exported_vars', 'name', 'blocks', '__weakref__') def __init__(self, environment, parent, name, blocks): self.parent = parent self.vars = {} self.environment = environment self.eval_ctx = EvalContext(self.environment, name) self.exported_vars = set() self.name = name # create the initial mapping of blocks. Whenever template inheritance # takes place the runtime will update this mapping with the new blocks # from the template. self.blocks = dict((k, [v]) for k, v in iteritems(blocks)) def super(self, name, current): """Render a parent block.""" try: blocks = self.blocks[name] index = blocks.index(current) + 1 blocks[index] except LookupError: return self.environment.undefined('there is no parent block ' 'called %r.' % name, name='super') return BlockReference(name, self, blocks, index) def get(self, key, default=None): """Returns an item from the template context, if it doesn't exist `default` is returned. """ try: return self[key] except KeyError: return default def resolve(self, key): """Looks up a variable like `__getitem__` or `get` but returns an :class:`Undefined` object with the name of the name looked up. """ if key in self.vars: return self.vars[key] if key in self.parent: return self.parent[key] return self.environment.undefined(name=key) def get_exported(self): """Get a new dict with the exported variables.""" return dict((k, self.vars[k]) for k in self.exported_vars) def get_all(self): """Return a copy of the complete context as dict including the exported variables. """ 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 argument if the callable is a :func:`contextfunction` or :func:`environmentfunction`. """ if __debug__: __traceback_hide__ = True # Allow callable classes to take a context fn = __obj.__call__ for fn_type in ('contextfunction', 'evalcontextfunction', 'environmentfunction'): if hasattr(fn, fn_type): __obj = fn break 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 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 iteritems(self.blocks)) return context def _all(meth): proxy = lambda self: getattr(self.get_all(), meth)() proxy.__doc__ = getattr(dict, meth).__doc__ proxy.__name__ = meth return proxy keys = _all('keys') values = _all('values') items = _all('items') # not available on python 3 if PY2: iterkeys = _all('iterkeys') itervalues = _all('itervalues') iteritems = _all('iteritems') del _all def __contains__(self, name): return name in self.vars or name in self.parent def __getitem__(self, key): """Lookup a variable or raise `KeyError` if the variable is undefined. """ item = self.resolve(key) if isinstance(item, Undefined): raise KeyError(key) return item def __repr__(self): return '<%s %s of %r>' % ( self.__class__.__name__, repr(self.get_all()), self.name ) # register the context as mapping if possible try: from collections import Mapping Mapping.register(Context) except ImportError: pass class BlockReference(object): """One block on a template reference.""" def __init__(self, name, context, stack, depth): self.name = name self._context = context self._stack = stack self._depth = depth @property def super(self): """Super the block.""" if self._depth + 1 >= len(self._stack): return self._context.environment. \ undefined('there is no parent block called %r.' % self.name, name='super') 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.eval_ctx.autoescape: rv = Markup(rv) return rv class LoopContext(object): """A loop context for dynamic iteration.""" def __init__(self, iterable, recurse=None, depth0=0): self._iterator = iter(iterable) self._recurse = recurse self._after = self._safe_next() self.index0 = -1 self.depth0 = depth0 # try to get the length of the iterable early. This must be done # here because there are some broken iterators around where there # __len__ is the number of iterations left (i'm looking at your # listreverseiterator!). try: self._length = len(iterable) except (TypeError, AttributeError): self._length = None def cycle(self, *args): """Cycles among the arguments with the current loop index.""" if not args: raise TypeError('no items for cycling given') return args[self.index0 % len(args)] first = property(lambda x: x.index0 == 0) last = property(lambda x: x._after is _last_iteration) index = property(lambda x: x.index0 + 1) revindex = property(lambda x: x.length - x.index0) revindex0 = property(lambda x: x.length - x.index) depth = property(lambda x: x.depth0 + 1) def __len__(self): return self.length def __iter__(self): return LoopContextIterator(self) def _safe_next(self): try: return next(self._iterator) except StopIteration: return _last_iteration @internalcode def loop(self, iterable): if self._recurse is None: raise TypeError('Tried to call non recursive loop. Maybe you ' "forgot the 'recursive' modifier.") return self._recurse(iterable, self._recurse, self.depth0 + 1) # 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 @property def length(self): if self._length is None: # if was not possible to get the length of the iterator when # the loop context was created (ie: iterating over a generator) # we have to convert the iterable into a sequence and use the # length of that. iterable = tuple(self._iterator) self._iterator = iter(iterable) self._length = len(iterable) + self.index0 + 1 return self._length def __repr__(self): return '<%s %r/%r>' % ( self.__class__.__name__, self.index, self.length ) @implements_iterator class LoopContextIterator(object): """The iterator for a loop context.""" __slots__ = ('context',) def __init__(self, context): self.context = context def __iter__(self): return self def __next__(self): ctx = self.context ctx.index0 += 1 if ctx._after is _last_iteration: raise StopIteration() next_elem = ctx._after ctx._after = ctx._safe_next() return next_elem, ctx class Macro(object): """Wraps a macro function.""" def __init__(self, environment, func, name, arguments, defaults, catch_kwargs, catch_varargs, caller): self._environment = environment self._func = func self._argument_count = len(arguments) self.name = name self.arguments = arguments self.defaults = defaults self.catch_kwargs = catch_kwargs self.catch_varargs = catch_varargs self.caller = caller @internalcode def __call__(self, *args, **kwargs): # 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 KeyError: try: 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) # it's important that the order of these arguments does not change # if not also changed in the compiler's `function_scoping` method. # the order is caller, keyword arguments, positional arguments! if self.caller: caller = kwargs.pop('caller', None) if caller is None: caller = self._environment.undefined('No caller defined', name='caller') arguments.append(caller) if self.catch_kwargs: arguments.append(kwargs) elif kwargs: raise TypeError('macro %r takes no keyword argument %r' % (self.name, next(iter(kwargs)))) if self.catch_varargs: arguments.append(args[self._argument_count:]) elif len(args) > self._argument_count: raise TypeError('macro %r takes not more than %d argument(s)' % (self.name, len(self.arguments))) return self._func(*arguments) def __repr__(self): return '<%s %s>' % ( self.__class__.__name__, self.name is None and 'anonymous' or repr(self.name) ) @implements_to_string class Undefined(object): """The default undefined type. This undefined type can be printed and iterated over, but every other access will raise an :exc:`UndefinedError`: >>> foo = Undefined(name='foo') >>> str(foo) '' >>> not foo True >>> foo + 42 Traceback (most recent call last): ... UndefinedError: 'foo' is undefined """ __slots__ = ('_undefined_hint', '_undefined_obj', '_undefined_name', '_undefined_exception') 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 missing: hint = '%r is undefined' % self._undefined_name elif not isinstance(self._undefined_name, string_types): hint = '%s has no element %r' % ( object_type_repr(self._undefined_obj), self._undefined_name ) else: 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__ = \ __getitem__ = __lt__ = __le__ = __gt__ = __ge__ = __int__ = \ __float__ = __complex__ = __pow__ = __rpow__ = \ _fail_with_undefined_error def __eq__(self, other): return type(self) is type(other) def __ne__(self, other): return not self.__eq__(other) def __hash__(self): return id(type(self)) def __str__(self): return u'' def __len__(self): return 0 def __iter__(self): if 0: yield None def __nonzero__(self): return False def __repr__(self): return 'Undefined' @implements_to_string class DebugUndefined(Undefined): """An undefined that returns the debug info when printed. >>> foo = DebugUndefined(name='foo') >>> str(foo) '{{ foo }}' >>> not foo True >>> foo + 42 Traceback (most recent call last): ... UndefinedError: 'foo' is undefined """ __slots__ = () def __str__(self): if self._undefined_hint is None: if self._undefined_obj is missing: return u'{{ %s }}' % self._undefined_name return '{{ no such element: %s[%r] }}' % ( object_type_repr(self._undefined_obj), self._undefined_name ) return u'{{ undefined value printed: %s }}' % self._undefined_hint @implements_to_string class StrictUndefined(Undefined): """An undefined that barks on print and iteration as well as boolean tests and all kinds of comparisons. In other words: you can do nothing with it except checking if it's defined using the `defined` test. >>> foo = StrictUndefined(name='foo') >>> str(foo) Traceback (most recent call last): ... UndefinedError: 'foo' is undefined >>> not foo Traceback (most recent call last): ... UndefinedError: 'foo' is undefined >>> foo + 42 Traceback (most recent call last): ... UndefinedError: 'foo' is undefined """ __slots__ = () __iter__ = __str__ = __len__ = __nonzero__ = __eq__ = \ __ne__ = __bool__ = __hash__ = \ Undefined._fail_with_undefined_error # remove remaining slots attributes, after the metaclass did the magic they # are unneeded and irritating as they contain wrong data for the subclasses. del Undefined.__slots__, DebugUndefined.__slots__, StrictUndefined.__slots__