/**
* @param Traversable|array[] $ASTs a series of AST roots
*
* @return string[] all the found symbols
*/
public function __invoke(Traversable $ASTs) : array
{
// note: dependency injection is not really feasible for these two, as they need to co-exist in parallel
$traverser = new NodeTraverser();
$traverser->addVisitor(new NameResolver());
$traverser->addVisitor($collector = new UsedSymbolCollector());
$astSymbols = [];
foreach ($ASTs as $astRoot) {
$traverser->traverse($astRoot);
$astSymbols[] = $collector->getCollectedSymbols();
}
return array_values(array_unique(array_merge([], ...$astSymbols)));
}
public function testWontCollectAnyUsageTypes()
{
$this->traverseStringAST('<?php function foo($bar) {}');
self::assertSameCollectedSymbols([], $this->collector->getCollectedSymbols());
}