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routeCalc.py
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routeCalc.py
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import re
import sys
def checkSolution(expression):
if re.match(r"^(?:-?\d+)\.*\d*$", expression): # Check for solution
return True
def populateMatch(m):
return [m.group(i) for i in range(1, 4)]
def recursiveEval(expression):
print(f"Evaluating: {expression}")
if checkSolution(expression):
return float(expression)
# -?\d +\.?\d * e?-?\d *)([*$])(-?\d +\.?\d * e?-?\d *
x = re.search(r"(-?\d+\.?\d*(?:e-\d*)?)([*$])(-?\d+\.?\d*(?:e-\d*)?)", expression)
if x:
match = populateMatch(x)
print(match)
if match[1] == "*":
result = float(match[0]) * float(match[2])
else: # Division
result = float(match[0]) / float(match[2])
evaluatedExpression = expression[:x.span()[0]] + str(result) + expression[x.span()[1]:]
return recursiveEval(evaluatedExpression)
else:
y = re.search(r"(-?\d+\.?\d*(?:e-\d*)?)([+-])(-?\d+\.?\d*(?:e-\d*)?)", expression)
if y:
match = populateMatch(y)
print(match)
if match[1] == "+":
result = float(match[0]) + float(match[2])
else: # Subtraction
result = float(match[0]) - float(match[2])
evaluatedExpression = expression[:y.span()[0]] + str(result) + expression[y.span()[1]:]
return recursiveEval(evaluatedExpression)
def calculate(expression):
if checkSolution(expression):
return float(expression)
if re.search(r"[^0-9e+\-*$]", expression): # Check for invalid characters
return '400: Bad request'
elif not re.search(r"^(?:-?\d+.?\d*)(?:[*$+-])(?:-?\d+.?\d*)*$", expression): # Check for invalid expressions
return '400: Bad request (Expression Invalid)'
return recursiveEval(expression)
e1 = "32e3*6"
e2 = "5+8-8*2$4"
e3 = "5e-4+2"
r1 = calculate(e3)
print(r1)
# print(float("2e-10"))
#
# eNeg = re.search(r'(-?\d+)e-(\d+)', component)
# if eNeg:
# print(eNeg)
# print(eNeg.group(1))
# print(eNeg.group(2))
# _result = int(eNeg.group(1))
# for _ in range(int(eNeg.group(2))):
# _result /= 10
# return _result
# else:
# return float(e.group(1))