/**
* Executes this check
*
* @param xp.compiler.types.TypeName
* @param string name method name
* @param xp.compiler.types.Scope scope
* @return string[] error or null
*/
protected function verifyMethod($type, $name, $scope)
{
// Verify target method exists
$target = new \xp\compiler\types\TypeInstance($scope->resolveType($type));
if (!$target->hasMethod($name)) {
return ['T404', 'No such method ' . $name . '() in ' . $target->name()];
}
// Verify visibility
$method = $target->getMethod($name);
if (!($method->modifiers & MODIFIER_PUBLIC)) {
$enclosing = $scope->resolveType($scope->declarations[0]->name);
if ($method->modifiers & MODIFIER_PRIVATE && !$enclosing->equals($target) || $method->modifiers & MODIFIER_PROTECTED && !($enclosing->equals($target) || $enclosing->isSubclassOf($target))) {
return ['T403', sprintf('Invoking %s %s::%s() from %s', implode(' ', \lang\reflect\Modifiers::namesOf($method->modifiers)), $target->name(), $method->name, $enclosing->name())];
}
}
}
/**
* Executes this check
*
* @param xp.compiler.ast.Node node
* @param xp.compiler.types.Scope scope
* @return bool
*/
public function verify(\xp\compiler\ast\Node $node, \xp\compiler\types\Scope $scope)
{
$access = \cast($node, 'xp.compiler.ast.MemberAccessNode');
// Verify type
// * var: Might have method
// * primitive, array, map, int: Definitely don't have fields
$type = $scope->typeOf($access->target);
if ($type->isVariable()) {
return ['T203', 'Member access (var).' . $access->name . '() verification deferred until runtime'];
} else {
if (!$type->isClass()) {
return ['T305', 'Using member access on unsupported type ' . $type->compoundName()];
}
}
// Verify target method exists
$target = new \xp\compiler\types\TypeInstance($scope->resolveType($type));
if ($target->hasField($access->name)) {
$member = $target->getField($access->name);
} else {
if ($target->hasProperty($access->name)) {
$member = $target->getProperty($access->name);
} else {
return ['T404', 'No such field $' . $access->name . ' in ' . $target->name()];
}
}
// Verify visibility
if (!($member->modifiers & MODIFIER_PUBLIC)) {
$enclosing = $scope->resolveType($scope->declarations[0]->name);
if ($member->modifiers & MODIFIER_PRIVATE && !$enclosing->equals($target) || $member->modifiers & MODIFIER_PROTECTED && !($enclosing->equals($target) || $enclosing->isSubclassOf($target))) {
return ['T403', sprintf('Accessing %s %s::$%s from %s', implode(' ', \lang\reflect\Modifiers::namesOf($member->modifiers)), $target->name(), $member->name, $enclosing->name())];
}
}
}