def primary(self):
if self.curr_token_is([TokenType.OPEN_PAREN]):
self.pop_token()
paren_expr = self.expression()
self.pop_token_expect([TokenType.CLOSE_PAREN],
'PARSER ERROR: Expecting right parenthesis')
return Expression.Grouping(paren_expr)
primary_tokens = [
TokenType.NUMBER, TokenType.STRING, TokenType.FALSE,
TokenType.TRUE, TokenType.NIL, TokenType.IDENTIFIER
]
curr_token = self.pop_token()
if curr_token.token_type not in primary_tokens:
error_msg = 'PARSER ERROR: Expecting one of: {0}, but got {1}'.format(
primary_tokens, curr_token.token_type)
self.lox_instance.raise_error_with_token(curr_token, error_msg)
raise ParseError()
if curr_token.token_type == TokenType.IDENTIFIER:
return Expression.Variable(curr_token)
primary_token_map = {
TokenType.NUMBER: curr_token.literal,
TokenType.STRING: curr_token.literal,
TokenType.FALSE: False,
TokenType.TRUE: True,
TokenType.NIL: None
}
return Expression.Literal(primary_token_map[curr_token.token_type])
def convert_not_literal(group_names, name, val):
return Expression.Literal(chr(val), 1)
def Any(s):
"""(s) -> match any character in s"""
if len(s) == 1:
return Expression.Literal(s)
return Expression.Any(s, 0)