from lexer import tokenize


def evaluate(text):
    """Left-to-right evaluation. Does not honour precedence."""
    tokens = tokenize(text)
    total = tokens[0]
    index = 1
    while index < len(tokens):
        op, rhs = tokens[index], tokens[index + 1]
        if op == "+":
            total = total + rhs
        elif op == "-":
            total = total - rhs
        elif op == "*":
            total = total * rhs
        index += 2
    return total