app/django/template/debug.py
author Sverre Rabbelier <srabbelier@gmail.com>
Sat, 22 Nov 2008 13:59:34 +0000
changeset 553 c0cc20b4afc9
parent 54 03e267d67478
permissions -rw-r--r--
Make redirect generic using the new Lists object This makes it possible (and easier) to have the list view redirect to any page specially tailored to the current item. Patch by: Sverre Rabbelier
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from django.template import Lexer, Parser, tag_re, NodeList, VariableNode, TemplateSyntaxError
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from django.utils.encoding import force_unicode
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from django.utils.html import escape
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from django.utils.safestring import SafeData, EscapeData
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class DebugLexer(Lexer):
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    def __init__(self, template_string, origin):
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        super(DebugLexer, self).__init__(template_string, origin)
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    def tokenize(self):
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        "Return a list of tokens from a given template_string"
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        result, upto = [], 0
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        for match in tag_re.finditer(self.template_string):
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            start, end = match.span()
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            if start > upto:
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                result.append(self.create_token(self.template_string[upto:start], (upto, start), False))
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                upto = start
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            result.append(self.create_token(self.template_string[start:end], (start, end), True))
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            upto = end
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        last_bit = self.template_string[upto:]
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        if last_bit:
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            result.append(self.create_token(last_bit, (upto, upto + len(last_bit)), False))
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        return result
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    def create_token(self, token_string, source, in_tag):
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        token = super(DebugLexer, self).create_token(token_string, in_tag)
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        token.source = self.origin, source
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        return token
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class DebugParser(Parser):
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    def __init__(self, lexer):
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        super(DebugParser, self).__init__(lexer)
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        self.command_stack = []
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    def enter_command(self, command, token):
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        self.command_stack.append( (command, token.source) )
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    def exit_command(self):
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        self.command_stack.pop()
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    def error(self, token, msg):
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        return self.source_error(token.source, msg)
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    def source_error(self, source,msg):
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        e = TemplateSyntaxError(msg)
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        e.source = source
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        return e
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    def create_nodelist(self):
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        return DebugNodeList()
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    def create_variable_node(self, contents):
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        return DebugVariableNode(contents)
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    def extend_nodelist(self, nodelist, node, token):
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        node.source = token.source
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        super(DebugParser, self).extend_nodelist(nodelist, node, token)
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    def unclosed_block_tag(self, parse_until):
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        command, source = self.command_stack.pop()
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        msg = "Unclosed tag '%s'. Looking for one of: %s " % (command, ', '.join(parse_until))
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        raise self.source_error(source, msg)
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    def compile_function_error(self, token, e):
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        if not hasattr(e, 'source'):
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            e.source = token.source
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class DebugNodeList(NodeList):
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    def render_node(self, node, context):
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        try:
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            result = node.render(context)
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        except TemplateSyntaxError, e:
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            if not hasattr(e, 'source'):
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                e.source = node.source
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            raise
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        except Exception, e:
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            from sys import exc_info
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            wrapped = TemplateSyntaxError(u'Caught an exception while rendering: %s' % force_unicode(e, errors='replace'))
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            wrapped.source = node.source
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            wrapped.exc_info = exc_info()
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            raise wrapped
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        return result
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class DebugVariableNode(VariableNode):
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    def render(self, context):
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        try:
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            output = force_unicode(self.filter_expression.resolve(context))
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        except TemplateSyntaxError, e:
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            if not hasattr(e, 'source'):
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                e.source = self.source
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            raise
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        except UnicodeDecodeError:
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            return ''
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        if (context.autoescape and not isinstance(output, SafeData)) or isinstance(output, EscapeData):
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            return escape(output)
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        else:
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            return output