Compiler Design Book Of Aa Puntambekar Pdf 71 2021 Here

# Token types INTEGER, PLUS, MINUS, EOF = 'INTEGER', 'PLUS', 'MINUS', 'EOF'

def error(self): raise Exception('Invalid character')

self.error()

def skip_whitespace(self): while self.current_char is not None and self.current_char.isspace(): self.advance()

# Lexer class class Lexer: def __init__(self, text): self.text = text self.pos = 0 self.current_char = self.text[self.pos] compiler design book of aa puntambekar pdf 71 2021

import re

if self.current_char.isdigit(): return Token(INTEGER, self.integer()) # Token types INTEGER, PLUS, MINUS, EOF =

# Example usage lexer = Lexer('2 + 3') token = lexer.get_next_token()