def parse_subscript_expression(self, node):
"""
Parse a subscript statement. Gets attributes and items from an
object.
"""
lineno = self.stream.lineno
if self.stream.current.type == 'dot':
self.stream.next()
token = self.stream.current
if token.type in ('name', 'integer'):
arg = nodes.ConstantExpression(token.value, token.lineno,
self.filename)
else:
raise TemplateSyntaxError('expected name or number',
token.lineno, self.filename)
self.stream.next()
elif self.stream.current.type == 'lbracket':
self.stream.next()
args = []
while self.stream.current.type != 'rbracket':
if args:
self.stream.expect('comma')
args.append(self.parse_subscribed_expression())
self.stream.expect('rbracket')
if len(args) == 1:
arg = args[0]
else:
arg = nodes.TupleExpression(args, lineno, self.filename)
else:
raise TemplateSyntaxError('expected subscript expression',
self.lineno, self.filename)
return nodes.SubscriptExpression(node, arg, lineno, self.filename)
def parse_number_expression(self):
"""
Parse a number literal.
"""
token = self.stream.current
if token.type not in ('integer', 'float'):
raise TemplateSyntaxError('integer or float literal expected',
token.lineno, self.filename)
self.stream.next()
return nodes.ConstantExpression(token.value, token.lineno, self.filename)
def parse_bool_expression(self):
"""
Parse a boolean literal.
"""
token = self.stream.expect('name')
if token.value == 'true':
value = True
elif token.value == 'false':
value = False
else:
raise TemplateSyntaxError("expected boolean literal",
token.lineno, self.filename)
return nodes.ConstantExpression(value, token.lineno, self.filename)
def parse_string_expression(self):
"""
Parse a string literal.
"""
token = self.stream.expect('string')
return nodes.ConstantExpression(token.value, token.lineno, self.filename)
def parse_none_expression(self):
"""
Parse a none literal.
"""
token = self.stream.expect('name', 'none')
return nodes.ConstantExpression(None, token.lineno, self.filename)