protected function procAssignment(Token $token)
{
$this->debug(__METHOD__, __LINE__, "identifier: {$token->getValue()}");
// Validate the leftside
if ($token->getType() != TokenType::IDENTIFIER) {
throw new SyntaxException($token->getLine(), $token->getColumn() - mb_strlen($token->getValue()) + 1, "Invalid assignment identifier: '{$token->getValue()}'", __FILE__, __LINE__);
}
$name = $token->getValue();
$token = $this->getToken();
// Validate the operator
switch ($token->getType()) {
case TokenType::SYMBOL:
switch ($token->getValue()) {
case ';':
if (!$this->memory->hasVar($name)) {
throw new SyntaxException($token->getLine(), $token->getColumn() - mb_strlen($name) + 1, "Unknown identifier: '{$name}'", __FILE__, __LINE__);
}
// Do nothing :\
return;
break;
case '=':
// allow =
break;
case '++':
case '--':
// allow ++ and --
break;
default:
throw new SyntaxException($token->getLine(), $token->getColumn() - mb_strlen($token->getValue()) + 1, "Invalid assignment operator: '{$token->getValue()}'", __FILE__, __LINE__);
}
break;
default:
throw new SyntaxException($token->getLine(), $token->getColumn() - mb_strlen($token->getValue()) + 1, "Invalid assignment operator: '{$token->getValue()}'", __FILE__, __LINE__);
}
$operator = $token->getValue();
// Evaluate the rightside
$type = $this->evalExp($value);
// Perform action
switch ($operator) {
case '=':
$this->memory->setVar($name, $value, $type);
break;
case '++':
// number only
// number only
case '--':
if (!$this->memory->hasVar($name)) {
throw new SyntaxException($token->getLine(), $token->getColumn(), "Unknown identifier: '{$name}'", __FILE__, __LINE__);
}
$value = $this->memory->getVar($name);
if ($operator == '++') {
$newval = intval($value + 1);
} else {
$newval = intval($value - 1);
}
$this->memory->setVar($name, $newval, $type);
break;
default:
throw new SyntaxException($token->getLine(), $token->getColumn() - mb_strlen($operator) + 1, "Unknown operator: '{$operator}'", __FILE__, __LINE__);
break;
}
}
