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from django.template import Lexer, Parser, tag_re, NodeList, VariableNode, TemplateSyntaxError
from django.utils.encoding import force_unicode
from django.utils.html import escape
from django.utils.safestring import SafeData, EscapeData
class DebugLexer(Lexer):
def __init__(self, template_string, origin):
super(DebugLexer, self).__init__(template_string, origin)
def tokenize(self):
"Return a list of tokens from a given template_string"
result, upto = [], 0
for match in tag_re.finditer(self.template_string):
start, end = match.span()
if start > upto:
result.append(self.create_token(self.template_string[upto:start], (upto, start), False))
upto = start
result.append(self.create_token(self.template_string[start:end], (start, end), True))
upto = end
last_bit = self.template_string[upto:]
if last_bit:
result.append(self.create_token(last_bit, (upto, upto + len(last_bit)), False))
return result
def create_token(self, token_string, source, in_tag):
token = super(DebugLexer, self).create_token(token_string, in_tag)
token.source = self.origin, source
return token
class DebugParser(Parser):
def __init__(self, lexer):
super(DebugParser, self).__init__(lexer)
self.command_stack = []
def enter_command(self, command, token):
self.command_stack.append( (command, token.source) )
def exit_command(self):
self.command_stack.pop()
def error(self, token, msg):
return self.source_error(token.source, msg)
def source_error(self, source,msg):
e = TemplateSyntaxError(msg)
e.source = source
return e
def create_nodelist(self):
return DebugNodeList()
def create_variable_node(self, contents):
return DebugVariableNode(contents)
def extend_nodelist(self, nodelist, node, token):
node.source = token.source
super(DebugParser, self).extend_nodelist(nodelist, node, token)
def unclosed_block_tag(self, parse_until):
command, source = self.command_stack.pop()
msg = "Unclosed tag '%s'. Looking for one of: %s " % (command, ', '.join(parse_until))
raise self.source_error(source, msg)
def compile_function_error(self, token, e):
if not hasattr(e, 'source'):
e.source = token.source
class DebugNodeList(NodeList):
def render_node(self, node, context):
try:
result = node.render(context)
except TemplateSyntaxError, e:
if not hasattr(e, 'source'):
e.source = node.source
raise
except Exception, e:
from sys import exc_info
wrapped = TemplateSyntaxError(u'Caught an exception while rendering: %s' % force_unicode(e, errors='replace'))
wrapped.source = node.source
wrapped.exc_info = exc_info()
raise wrapped
return result
class DebugVariableNode(VariableNode):
def render(self, context):
try:
output = force_unicode(self.filter_expression.resolve(context))
except TemplateSyntaxError, e:
if not hasattr(e, 'source'):
e.source = self.source
raise
except UnicodeDecodeError:
return ''
if (context.autoescape and not isinstance(output, SafeData)) or isinstance(output, EscapeData):
return escape(output)
else:
return output
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