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51 lines
2.0 KiB
Python
51 lines
2.0 KiB
Python
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import re
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from decimal import Decimal
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from functools import reduce
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class RegexInplaceParser(object):
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def __init__(self, string):
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self.string = string
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def add(self, string):
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while(len(re.findall("[+]{1}[-]?", string)) != 0):
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string = re.sub("[-]?\d+[.]?\d*[+]{1}[-]?\d+[.]?\d*", str("%f" % reduce((lambda x, y: x + y), [Decimal(i) for i in re.split("[+]{1}", re.search("[-]?\d+[.]?\d*[+]{1}[-]?\d+[.]?\d*", string).group())])), string, 1)
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return string
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def sub(self, string):
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while(len(re.findall("\d+[.]?\d*[-]{1,2}\d+[.]?\d*", string)) != 0):
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g = re.search("\d+[.]?\d*[-]{1,2}\d+[.]?\d*", string).group()
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if(re.search("[-]{1,2}", g).group() == "-"):
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r = re.sub("[-]{1}", "+-", g, 1)
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string = re.sub(g, r, string, 1)
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elif(re.search("[-]{1,2}", g).group() == "--"):
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r = re.sub("[-]{2}", "+", g, 1)
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string = re.sub(g, r, string, 1)
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else:
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pass
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return string
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def mul(self, string):
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while(len(re.findall("[*]{1}[-]?", string)) != 0):
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string = re.sub("[-]?\d+[.]?\d*[*]{1}[-]?\d+[.]?\d*", str("%f" % reduce((lambda x, y: x * y), [Decimal(i) for i in re.split("[*]{1}", re.search("[-]?\d+[.]?\d*[*]{1}[-]?\d+[.]?\d*", string).group())])), string, 1)
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return string
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def div(self, string):
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while(len(re.findall("[/]{1}[-]?", string)) != 0):
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string = re.sub("[-]?\d+[.]?\d*[/]{1}[-]?\d+[.]?\d*", str("%f" % reduce((lambda x, y: x / y), [Decimal(i) for i in re.split("[/]{1}", re.search("[-]?\d+[.]?\d*[/]{1}[-]?\d+[.]?\d*", string).group())])), string, 1)
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return string
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def exp(self, string):
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while(len(re.findall("[\^]{1}[-]?", string)) != 0):
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string = re.sub("[-]?\d+[.]?\d*[\^]{1}[-]?\d+[.]?\d*", str("%f" % reduce((lambda x, y: x ** y), [Decimal(i) for i in re.split("[\^]{1}", re.search("[-]?\d+[.]?\d*[\^]{1}[-]?\d+[.]?\d*", string).group())])), string, 1)
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return string
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def evaluate(self):
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string = self.string
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string = self.exp(string)
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string = self.div(string)
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string = self.mul(string)
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string = self.sub(string)
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string = self.add(string)
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return string
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