From: Armin Ronacher Date: Sun, 11 May 2008 21:21:16 +0000 (+0200) Subject: readded support for recursive for-loops X-Git-Tag: 2.0rc1~72 X-Git-Url: http://git.tremily.us/?a=commitdiff_plain;h=1e1e890a099ad5ea645d0ea664e20de43cdf1af5;p=jinja2.git readded support for recursive for-loops --HG-- branch : trunk --- diff --git a/jinja2/compiler.py b/jinja2/compiler.py index df1a85e..4716de1 100644 --- a/jinja2/compiler.py +++ b/jinja2/compiler.py @@ -499,7 +499,8 @@ class CodeGenerator(NodeVisitor): self.writeline('%s = l_%s' % (ident, name)) return aliases - def function_scoping(self, node, frame, children=None): + def function_scoping(self, node, frame, children=None, + find_special=True): """In Jinja a few statements require the help of anonymous functions. Those are currently macros and call blocks and in the future also recursive loops. As there is currently @@ -542,6 +543,10 @@ class CodeGenerator(NodeVisitor): func_frame.identifiers.declared ) + # no special variables for this scope, abort early + if not find_special: + return func_frame + func_frame.accesses_kwargs = False func_frame.accesses_varargs = False func_frame.accesses_caller = False @@ -791,14 +796,35 @@ class CodeGenerator(NodeVisitor): self.writeline('context.exported_vars.discard(%r)' % alias) def visit_For(self, node, frame): - loop_frame = frame.inner() - loop_frame.inspect(node.iter_child_nodes(exclude=('iter',))) - extended_loop = bool(node.else_) or \ + # when calculating the nodes for the inner frame we have to exclude + # the iterator contents from it + children = node.iter_child_nodes(exclude=('iter',)) + + if node.recursive: + loop_frame = self.function_scoping(node, frame, children, + find_special=False) + else: + loop_frame = frame.inner() + loop_frame.inspect(children) + + extended_loop = node.recursive or node.else_ or \ 'loop' in loop_frame.identifiers.undeclared if extended_loop: loop_frame.identifiers.add_special('loop') - aliases = self.collect_shadowed(loop_frame) + # if we don't have an recursive loop we have to find the shadowed + # variables at that point + if not node.recursive: + aliases = self.collect_shadowed(loop_frame) + + # otherwise we set up a buffer and add a function def + else: + loop_frame.buffer = buf = self.temporary_identifier() + self.writeline('def loop(reciter, loop_render_func):', node) + self.indent() + self.writeline('%s = []' % buf, node) + aliases = {} + self.pull_locals(loop_frame) if node.else_: self.writeline('l_loop = None') @@ -825,17 +851,25 @@ class CodeGenerator(NodeVisitor): self.write(' for ') self.visit(node.target, loop_frame) self.write(' in ') - self.visit(node.iter, loop_frame) + if node.recursive: + self.write('reciter') + else: + self.visit(node.iter, loop_frame) self.write(' if (') test_frame = loop_frame.copy() self.writeline('l_loop = ' + parent_loop) self.visit(node.test, test_frame) self.write('))') + elif node.recursive: + self.write('reciter') else: self.visit(node.iter, loop_frame) - self.write(extended_loop and '):' or ':') + if node.recursive: + self.write(', recurse=loop_render_func):') + else: + self.write(extended_loop and '):' or ':') # tests in not extended loops become a continue if not extended_loop and node.test is not None: @@ -862,6 +896,23 @@ class CodeGenerator(NodeVisitor): for name, alias in aliases.iteritems(): self.writeline('l_%s = %s' % (name, alias)) + # if the node was recursive we have to return the buffer contents + # and start the iteration code + if node.recursive: + if self.environment.autoescape: + self.writeline('return Markup(concat(%s))' % buf) + else: + self.writeline('return concat(%s)' % buf) + self.outdent() + if frame.buffer is None: + self.writeline('yield loop(', node) + else: + self.writeline('%s.append(loop(' % frame.buffer, node) + self.visit(node.iter, frame) + self.write(', loop)') + if frame.buffer is not None: + self.write(')') + def visit_If(self, node, frame): if_frame = frame.soft() self.writeline('if ', node) @@ -1000,10 +1051,14 @@ class CodeGenerator(NodeVisitor): body.append([const]) # if we have less than 3 nodes or less than 6 and a buffer we - # yield or extend + # yield or extend/append if len(body) < 3 or (frame.buffer is not None and len(body) < 6): if frame.buffer is not None: - self.writeline('%s.extend((' % frame.buffer) + # for one item we append, for more we extend + if len(body) == 1: + self.writeline('%s.append(' % frame.buffer) + else: + self.writeline('%s.extend((' % frame.buffer) for item in body: if isinstance(item, list): val = repr(concat(item)) @@ -1027,7 +1082,8 @@ class CodeGenerator(NodeVisitor): if frame.buffer is not None: self.write(', ') if frame.buffer is not None: - self.write('))') + # close the open parentheses + self.write(len(body) == 1 and ')' or '))') # otherwise we create a format string as this is faster in that case else: diff --git a/jinja2/runtime.py b/jinja2/runtime.py index 8fb3f0b..d734182 100644 --- a/jinja2/runtime.py +++ b/jinja2/runtime.py @@ -178,10 +178,11 @@ class TemplateReference(object): class LoopContext(object): """A loop context for dynamic iteration.""" - def __init__(self, iterable, enforce_length=False): + def __init__(self, iterable, enforce_length=False, recurse=None): self._iterable = iterable self._next = iter(iterable).next self._length = None + self._recurse = recurse self.index0 = -1 if enforce_length: len(self) @@ -204,6 +205,12 @@ class LoopContext(object): def __iter__(self): return self + def __call__(self, iterable): + if self._recurse is None: + raise TypeError('Tried to call non recursive loop. Maybe you ' + 'forgot the "recursive" keyword.') + return self._recurse(iterable, self._recurse) + def next(self): self.index0 += 1 return self._next(), self