Parser.php
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Parser.php
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	<?php

	namespace Keruald\Yaml;

	use Symfony\Component\Yaml\Tag\TaggedValue;
	use Symfony\Component\Yaml\Yaml;

	use Keruald\Yaml\Tags\Tag;

	use InvalidArgumentException;

	class Parser {

	/**
	* @var array<string, Tag>
	*/
	private array $tags = [];

	///
	/// Configure
	///

	public function withTagClass (string $type) : self {
	$tag = new $type();

	return $this->withTag($tag);
	}

	public function withTag (Tag $tag) : self {
	$tag->register($this->tags);

	return $this;
	}

	///
	/// Parse
	///

	/**
	* @throws InvalidArgumentException if a tag is not defined at parser level
	*/
	public function parse (string $expression) : mixed {
	$flags = Yaml::PARSE_CUSTOM_TAGS;
	$parsed = Yaml::parse($expression, $flags);

	return $this->resolve($parsed);
	}

	/**
	* @throws InvalidArgumentException if the file is not found
	* @throws InvalidArgumentException if a tag is not defined at parser level
	*/
	public function parseFile (string $filename) : mixed {
	if (!file_exists($filename)) {
	throw new InvalidArgumentException("File not found: $filename");
	}

	$flags = Yaml::PARSE_CUSTOM_TAGS;
	$parsed = Yaml::parseFile($filename, $flags);

	return $this->resolve($parsed);
	}

	private function resolve (mixed $data) {
	if ($data instanceof TaggedValue) {
	$tag = $data->getTag();

	if (!array_key_exists($tag, $this->tags)) {
	throw new InvalidArgumentException("Tag not found: $tag");
	}

	$tagHandler = $this->tags[$tag];

	return $tagHandler->handle($data->getValue());
	}

	if (is_array($data)) {
	foreach ($data as $key => $value) {
	$data[$key] = $this->resolve($value);
	}
	}

	return $data;
	}

	}