263 lines
8.4 KiB
Python
263 lines
8.4 KiB
Python
# by weilinfox~
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# 支持四则运算，括号和浮点数，可以省略部分乘号
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# 支持语法检查
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from zzcore import StdAns
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divError = False
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#函数段
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def reportErr (errorNo, ch):
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if (errorNo == 1):
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return ch + "是什么东西嘛，哼！"
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elif (errorNo == 2):
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return "括号一个一个对不起来了啦~"
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elif (errorNo == 3):
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return ch + "都不会用了嘿！"
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elif (errorNo == 4):
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return "一个数小数点那么多拿来做什么嘞！"
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elif (errorNo == 5):
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return "多出来的小数点很孤单的啦~"
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elif (errorNo == 6):
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return "啊吓死我了，0怎么做除数了啊……"
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else:
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return "啊呀呀这是啥错误啊？问问狸去：" + ch
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def supportCh (ch):
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if (ch.isdigit()):
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return True;
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elif (ch == "+" or ch == "-" or ch == "*" or ch == "/" or ch == '.'):
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return True
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elif (ch == '(' or ch == ')'):
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return True
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else:
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return False
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def exprCal (ch):
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#处理不带括号的表达式
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global divError
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mulflag = False
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plusflag = False
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if (ch[0] == '-'):
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ch = '0' + ch
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ch = ch.replace("--", "+")
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ch = ch.replace("+-", "-")
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for i in range(1, len(ch), 1):
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if ((ch[i] == "+" or ch[i] == '-') and ch[i-1] != '/' and ch[i-1] != '*'):
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plusflag = True;
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elif (ch[i] == '*' or ch[i] == '/'):
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mulflag = True;
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if (mulflag and plusflag):
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break;
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if (not mulflag and not plusflag):
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return ch;
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elif (mulflag and plusflag):
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while (1):
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fmul = lmul = 0
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i = 0
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for c in ch:
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if (c == '*' or c == '/'):
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if (fmul == 0):
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fmul = i
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lmul = i
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elif (fmul != 0 and (c == '+' or c == '-')):
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break
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i += 1
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if (fmul == 0 and lmul == 0):
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break;
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fmul -= 1
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lmul += 1
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if (ch[lmul] == '-' or ch[lmul] == '+'):
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lmul += 1
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while (fmul >= 0 and (ch[fmul].isdigit() or ch[fmul] == '.')):
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fmul -= 1
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while (lmul < len(ch) and (ch[lmul].isdigit() or ch[lmul] == '.')):
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lmul += 1
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fmul += 1
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ch = ch[:fmul] + exprCal(ch[fmul:lmul]) + ch[lmul:]
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# print(ch)
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return exprCal(ch)
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elif (mulflag):
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while (1):
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fst = lst = 0
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i = 0
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for c in ch:
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if (c == '*' or c == '/'):
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if (fst == 0):
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fst = i
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else:
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lst = i
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break
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i += 1
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if (lst == 0):
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num2 = float(ch[fst+1:])
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if (num2 == 0.0):
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num2 = 1
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divError = True
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num1 = float(ch[:fst])
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if (ch[fst] == '*'):
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return str(num1 * num2)
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elif (ch[fst] == '/'):
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return str(num1 / num2)
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else:
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ch = exprCal(ch[:lst]) + ch[lst:]
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elif (plusflag):
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while (1):
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ch = ch.replace("+-", "-")
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ch = ch.replace("--", "+")
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fst = lst = 0
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i = 0
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for c in ch:
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if (c == '+' or c == '-'):
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if (fst == 0):
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fst = i
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else:
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lst = i
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break
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i += 1
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if (lst == 0):
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num2 = float(ch[fst+1:])
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num1 = float(ch[:fst])
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if (ch[fst] == '+'):
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return str(num1 + num2)
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elif (ch[fst] == '-'):
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return str(num1 - num2)
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else:
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ch = exprCal(ch[:lst]) + ch[lst:]
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def bracketExprCal (ch):
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#处理带括号的表达式
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fbr = lbr = -1
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i = 0
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for c in ch:
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if (c == '('):
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fbr = i
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elif (c == ')'):
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lbr = i
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break
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i += 1
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if (fbr == -1):
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return exprCal(ch)
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else:
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if (lbr+1 >= len(ch)):
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# print(ch)
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return bracketExprCal(ch[:fbr] + bracketExprCal(ch[fbr+1:lbr]))
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else:
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# print(ch)
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return bracketExprCal(ch[:fbr] + bracketExprCal(ch[fbr+1:lbr]) + ch[lbr+1:])
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def bcMain(com):
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global divError
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#预处理
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#字符替换
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com = com.replace(" ", "")
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com = com.replace("\'", "")
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com = com.replace("\"", "")
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com = com.replace(",", ".")
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com = com.replace("{", "(")
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com = com.replace("}", ")")
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com = com.replace("[", "(")
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com = com.replace("]", ")")
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com = com.replace("+-", "-")
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com = com.replace("--", "+")
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com = com.replace("*+", "*")
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com = com.replace("/+", "/")
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com = com.replace("(-", "(0-")
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com = com.replace("(+", "(0+")
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com = com.replace("()", "")
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com = com.replace("x", "*")
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com = com.replace("X", "*")
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#省略乘号的支持
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for i in range(1, len(com)-1, 1):
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if (com[i] == '(' and (com[i-1].isdigit() or com[i-1] == '.' or com[i-1] == ')')):
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com = com[:i] + "*" + com[i:]
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elif (com[i] == ')' and (com[i+1].isdigit() or com[i+1] == '.' or com[i+1] == '(' or com[i+1] == '-')):
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com = com[:i+1] + "*" + com[i+1:]
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#部分情况开头加0
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if (com[0] == '+' or com[0] == '-' or com[0] == '.'):
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com = '0' + com
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#print(com)
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#表达式合法性
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#括号合法性
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ncom = ""
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for ch in com:
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if (not supportCh(ch)):
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return reportErr(1, ch)
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elif (ch == "(" or ch == ")"):
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ncom += ch
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nlen = plen = len(ncom)
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while (nlen > 0):
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ncom = ncom.replace("()", "")
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nlen = len(ncom)
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if (nlen == plen):
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return reportErr(2, ncom[0])
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plen = nlen
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#运算符及小数点位置合法性
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ncom = com.replace("(", "")
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ncom = ncom.replace(")", "")
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if (not ncom[0].isdigit() and ncom[0] != '+' and ncom[0] != '-' and ncom[0] != '.'):
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return reportErr(3, ncom[0])
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elif ((ncom[0] == '+' or ncom[0] == '-') and (len(ncom) < 2 or not ncom[1].isdigit())):
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return reportErr(3, ncom[0])
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elif (ncom[0] == '.' and (len(ncom) < 2 or not ncom[1].isdigit())):
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return reportErr(5, "")
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elif (not ncom[len(ncom)-1].isdigit() and ncom[len(ncom)-1] != '.'):
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return reportErr(3, ncom[len(ncom)-1])
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elif (ncom[len(ncom)-1] == '.' and (len(ncom) < 2 or not ncom[len(ncom)-2].isdigit())):
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return reportErr(5, "")
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for i in range(1, len(ncom)-1, 1):
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#if (ncom[i] == "+" or ncom[i] == "-" or ncom[i] == "*" or ncom[i] == "/"):
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# if ((not ncom[i-1].isdigit() and ncom[i-1] != '.') or (not ncom[i+1].isdigit() and ncom[i+1] != '.')):
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# return reportErr(3, ncom[i])
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if (ncom[i] == "+" or ncom[i] == "-"):
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if ((not ncom[i-1].isdigit() and ncom[i-1] != '.' and ncom[i-1] != "*" and ncom[i-1] != "/") or (not ncom[i+1].isdigit() and ncom[i+1] != '.')):
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return reportErr(3, ncom[i])
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if (ncom[i] == "*" or ncom[i] == "/"):
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if ((not ncom[i-1].isdigit() and ncom[i-1] != '.') or (not ncom[i+1].isdigit() and ncom[i+1] != '.' and ncom[i+1] != "-" and ncom[i+1] != "+")):
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return reportErr(3, ncom[i])
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elif (ncom[i] == '.'):
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if (not ncom[i-1].isdigit() and not ncom[i+1].isdigit()):
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return reportErr(5, "")
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#小数点数量合法性
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inNum = False
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dotNum = 0
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for i in range(0, len(com), 1):
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if (com[i].isdigit()):
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inNum = True
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elif (com[i] == "."):
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inNum = True
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dotNum += 1
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else:
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inNum = False
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if (dotNum > 1):
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return reportErr(4, ".")
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dotNum = 0
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if (dotNum > 1):
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return reportErr(4, ".")
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ans = str(bracketExprCal(com))
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if (divError):
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divError = False
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return reportErr(6, "")
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return ans
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#代码段
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class Ans (StdAns):
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def GETMSG(self):
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ans = "汝以为咱不会算算数的嘛！"
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for s in self.parms:
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if (s == "help"):
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ans = "你喂给我式子我算呀，还不会问狸吧~"
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break
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elif (s != "bc"):
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ans += "\n" + s + " ==> " + bcMain(s)
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return ans
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