Compiler Design Book Of Aa Puntambekar Pdf 71 2021 Apr 2026

self.error()

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)

if self.current_char.isspace(): self.skip_whitespace() continue

if self.current_char == '-': self.advance() return Token(MINUS, '-')

# Lexer class class Lexer: def __init__(self, text): self.text = text self.pos = 0 self.current_char = self.text[self.pos]

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

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# Token class class Token: def __init__(self, type, value): self.type = type self.value = value