study_regex_compiler.py

import re


code = 'se 1234 > 4321: mostre "verdadeiro"'


def mostre(code):
    code = code.replace(' ', '')
    r_print = re.compile('^mostre"[a-z A-Z]*"$')
    rprint = r_print.match(code)

    if rprint == None:
        return False
    p = re.compile('"([^"]*)"').findall(rprint.group())[0]
    print(p)
    return True


def se(code):
    r_if = re.compile('^se [a-z 0-9]* [><=!] [a-z 0-9]*\:')
    rif = r_if.match(code)

    if rif == None:
        return None, None

    b_expression = code[2:].split(':')[0].replace(' ', '')
    return eval(b_expression), ''.join(code.split(':')[1:]).replace(' ', '')


print('transpiler example with regex, write \'exit\' to quit\n')
while True:
    
    scode = input('transpiler>')
    if scode == 'exit': exit(1)

    res, exp = se(scode)
    if res != None:
        if res == True:
            if not mostre(exp):
                result = eval(exp)
                if result != None: print(result)
    elif not mostre(scode):
        try:
            result = eval(scode)    
            if result != None: print(result)
        except Exception as e:
            exec(scode)