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calc4.py
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calc4.py
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#!/usr/bin/env python
# -*- coding: utf-8 -*-
# @Date : 2017-06-06 14:28:37
# @Link : ${link}
# @Version : $Id$
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
# Token的类型
# EOF用来表明对词法分析来说已经没有输入词了
INTEGER, MUL, DIV, EOF = 'INTEGER', 'MUL', 'DIV', 'EOF'
class Token(object):
def __init__(self, type, value):
# token type: INTEGER, MUL, DIV, or EOF
self.type = type
# token value: non-negative integer value, '*', '/', or None
self.value = value
def __str__(self):
"""类实例的string表达
Examples:
Token(INTEGER, 3)
Token(MUL, '*')
"""
return 'Token({type}, {value})'.format(
type=self.type,
value=repr(self.value)
)
def __repr__(self):
return self.__str__()
class Lexer(object):
def __init__(self, text):
# client string input, e.g. "3 * 5", "12 / 3 * 4", etc
self.text = text
# self.pos is an index into self.text
self.pos = 0
self.current_char = self.text[self.pos]
def error(self):
raise Exception('Invalid character')
def advance(self):
"""Advance the `pos` pointer and set the `current_char` variable."""
self.pos += 1
if self.pos > len(self.text) - 1:
self.current_char = None # Indicates end of input
else:
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()
def integer(self):
"""Return a (multidigit) integer consumed from the input."""
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):
"""语法分析器
将输入变为一个个的tokens
返回下一个token
"""
while self.current_char is not None:
if self.current_char.isspace():
self.skip_whitespace()
continue
if self.current_char.isdigit():
return Token(INTEGER, self.integer())
if self.current_char == '*':
self.advance()
return Token(MUL, '*')
if self.current_char == '/':
self.advance()
return Token(DIV, '/')
self.error()
return Token(EOF, None)
class Interpreter(object):
def __init__(self, lexer):
self.lexer = lexer
# set current token to the first token taken from the input
self.current_token = self.lexer.get_next_token()
def error(self):
raise Exception('Invalid syntax')
def eat(self, token_type):
# 将当前token的type与传递进来的type进行比较,如果相同就“吃掉”当前token,将下一个token赋值给当前token,否则报错
if self.current_token.type == token_type:
self.current_token = self.lexer.get_next_token()
else:
self.error()
def factor(self):
"""factor相当于类型的统称
返回一个 INTEGER token 的值.
factor : INTEGER
"""
token = self.current_token
self.eat(INTEGER)
return token.value
def expr(self):
"""Arithmetic expression parser / interpreter.
expr : factor ((MUL | DIV) factor)*
factor : INTEGER
"""
result = self.factor()
while self.current_token.type in (MUL, DIV):
token = self.current_token
if token.type == MUL:
self.eat(MUL)
result = result * self.factor()
elif token.type == DIV:
self.eat(DIV)
result = result / self.factor()
return result
def main():
while True:
try:
# To run under Python3 replace 'raw_input' call
# with 'input'
text = raw_input('calc> ')
except EOFError:
break
if not text:
continue
lexer = Lexer(text)
interpreter = Interpreter(lexer)
result = interpreter.expr()
print(result)
if __name__ == '__main__':
main()