Ticket #625: django-template-decorators.diff

django/core/template_decorators.py

@@ +1 @@
+from inspect import getargspec
+from django.core import template
+from django.core.template_loader import render_to_string, get_template
+from django.utils.functional import curry
+
+def gen_compile_func(params, defaults, name, node_class, parser, token):
+    #look in tags for
+    bits = token.contents.split()[1:]
+    bmax = len(params)
+    def_len = defaults and len(defaults) or 0
+    bmin = bmax - def_len
+    if( len(bits) < bmin or len(bits) > bmax  ):
+        if bmin == bmax:
+            message = "%s takes %s arguments" % (name, bmin)
+        else:
+            message = "%s takes between %s and %s arguments" % (name, bmin, bmax)
+        raise template.TemplateSyntaxError(message)
+    return node_class(bits)
+
+
+def simple_tag(func):
+    (params,_, _, defaults) = getargspec(func)
+    class TNode(template.Node):
+        def __init__(self, vars_to_resolve):
+            #get the vars to resolve
+            self.vars_to_resolve = vars_to_resolve    
+
+        def render(self, context):
+            resolved_vars = [template.resolve_variable(var, context) 
+                              for var in self.vars_to_resolve]
+            return func(*resolved_vars)
+    compile_func = curry(gen_compile_func, params, defaults, func.__name__, TNode)
+    compile_func.__doc__ = func.__doc__
+    template.register_tag(func.__name__, compile_func)
+    return func
+
+
+def inclusion_tag(file_name, context_class=template.Context, takes_context=False):
+    def dec(func):
+        (params,_, _, defaults) = getargspec(func)
+        if takes_context:
+            if params[0] == 'context':
+                params = params[1:]
+            else:
+                raise template.TemplateSyntaxError("Any tag function decorated with takes_context=True must have a first argument of 'context'" )
+        class TNode(template.Node):
+            def __init__(self, vars_to_resolve):
+                self.vars_to_resolve = vars_to_resolve
+
+            def render(self, context):
+                resolved_vars = [template.resolve_variable(var, context)
+                                 for var in self.vars_to_resolve]
+                if takes_context:
+                    args = [context] + resolved_vars
+                else:
+                    args = resolved_vars
+
+                dict = func(*args)
+                
+                if not getattr(self, 'nodelist', False):
+                    t = get_template(file_name)
+                    self.nodelist = t.nodelist
+                return self.nodelist.render(context_class(dict))
+
+        compile_func = curry(gen_compile_func, params, defaults, func.__name__, TNode)
+        compile_func.__doc__ = func.__doc__
+        template.register_tag(func.__name__, compile_func)
+        return func
+    return dec
+