Ticket #398: define-tag.diff

File define-tag.diff, 2.7 KB (added by jvr_django@…, 19 years ago)

patch for new {%define VAR as%}VALUE{%in%} tag

  • django-trunk/django/core/defaulttags.py

     
    2525        output.append(pformat(sys.modules))
    2626        return ''.join(output)
    2727
     28class DefineNode(template.Node):
     29    def __init__(self, name, value, body):
     30        self.name = name
     31        self.value = value
     32        self.body = body
     33
     34    def render(self, context):
     35        value = self.value.render(context)
     36        context.push()
     37        context[self.name] = value
     38        rendering =  self.body.render(context)
     39        context.pop()
     40        return rendering
     41
    2842class FilterNode(template.Node):
    2943    def __init__(self, filters, nodelist):
    3044        self.filters, self.nodelist = filters, nodelist
    … …  
    359373    "Print a whole load of debugging information, including the context and imported modules"
    360374    return DebugNode()
    361375
     376def do_define(parser, token, parse_until):
     377    """Sets variable until the end of the template or enclosing scope.
     378
     379    Usage::
     380
     381        {% define VAR as %}
     382        VALUE
     383        {% in %}
     384        BODY ...
     385
     386    Example::
     387
     388        {% define title_var as%}
     389            {% block title %}The default title{% endblock %}
     390        {% in %}
     391        <html>
     392        <head>
     393            <title>{{title_var}}</title>
     394        </head>
     395        <body>
     396            <h1>{{title_var}}</h1>
     397            ...
     398
     399    In this example, block title is evaluated once and the result is
     400    assigned to the variable title_var, which is used twice.
     401
     402    If the definition is enclosed by a for-, if- or else-block, it lasts
     403    ONLY to the END of the enclosing block.
     404    """
     405    bits = token.contents.split()
     406    if len(bits) != 3:
     407        raise template.TemplateSyntaxError, "'define' statements should have three words"
     408    if bits[2] != 'as':
     409        raise template.TemplateSyntaxError, "third word of 'define' statement should be '%s'" % bits[2]
     410    name = bits[1]
     411    # parse the value
     412    value = parser.parse(('in',))
     413    parser.delete_first_token()
     414    # parse up to the end of the enclosing block
     415    body = parser.parse(parse_until)
     416    return DefineNode(name, value, body)
     417
     418
     419
     420
     421
    362422def do_filter(parser, token):
    363423    """
    364424    Filter the contents of the blog through variable filters.
    … …  
    733793template.register_tag('comment', do_comment)
    734794template.register_tag('cycle', do_cycle)
    735795template.register_tag('debug', do_debug)
     796template.register_tag('define', do_define)
    736797template.register_tag('filter', do_filter)
    737798template.register_tag('firstof', do_firstof)
    738799template.register_tag('for', do_for)
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