calculator.py

class Parser:
    def __init__(self, text):
        self.text = ''.join(text.split())
        self.pos = 0

    def parse(self):
        return self.parse_expression()

    def parse_expression(self):
        result = self.parse_term()
        while self.pos < len(self.text):
            if self.text[self.pos] == '+':
                self.pos += 1
                result += self.parse_term()
            elif self.text[self.pos] == '-':
                self.pos += 1
                result -= self.parse_term()
            else:
                break
        return result

    def parse_term(self):
        result = self.parse_factor()
        while self.pos < len(self.text):
            if self.text[self.pos] == '*':
                self.pos += 1
                result *= self.parse_factor()
            elif self.text[self.pos] == '/':
                self.pos += 1
                result /= self.parse_factor()
            else:
                break
        return result

    def parse_factor(self):
        result = self.parse_number()
        while self.pos < len(self.text):
            if self.text[self.pos] == '^':
                self.pos += 1
                result = result ** self.parse_factor()
            elif self.text[self.pos] == '(':
                self.pos += 1
                result = self.parse_expression()
                self.pos += 1  # Consume closing parenthesis
            else:
                break
        return result

    def parse_number(self):
        number = 0
        while self.pos < len(self.text) and self.text[self.pos].isdigit():
            number = number * 10 + int(self.text[self.pos])
            self.pos += 1
        return number

def parse_math_expression(text):
    parser = Parser(text)
    return parser.parse()

# Example usage:
expression = "3 + 5 * (2 ^ 3) - 6 / 2"
result = parse_math_expression(expression)
print(f"Result of '{expression}' is: {result}")