def get_next_token(self): while self.current_char is not None:
Here is sample code for lexical analyzer
def error(self): raise Exception('Invalid character') compiler design book of aa puntambekar pdf 71 2021
import re
def integer(self): result = '' while self.current_char is not None and self.current_char.isdigit(): result += self.current_char self.advance() return int(result) def get_next_token(self): while self
return Token(EOF, None)
# Example usage lexer = Lexer('2 + 3') token = lexer.get_next_token() compiler design book of aa puntambekar pdf 71 2021
# Token class class Token: def __init__(self, type, value): self.type = type self.value = value