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<?php |
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namespace Dallgoot\Yaml; |
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use Dallgoot\Yaml\Nodes; |
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use Dallgoot\Yaml\Regex; |
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use Dallgoot\Yaml\Nodes\NodeGeneric; |
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/** |
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* Analyzes $nodeString |
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* determines the appropriate NodeType |
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* constructs it |
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* and returns it |
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* |
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* @author Stéphane Rebai <[email protected]> |
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* @license Apache 2.0 |
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* @link https://github.com/dallgoot/yaml |
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*/ |
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final class NodeFactory |
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{ |
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private const JSON_OPTIONS = \JSON_PARTIAL_OUTPUT_ON_ERROR|\JSON_UNESCAPED_SLASHES; |
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final public static function get($nodeString = null, $line = 0):NodeGeneric |
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{ |
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$trimmed = ltrim($nodeString); |
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if ($trimmed === '') return new Nodes\Blank($nodeString, $line); |
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elseif (substr($trimmed, 0, 3) === '...') return new Nodes\DocEnd($nodeString, $line); |
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elseif ((bool) preg_match(Regex::KEY, $trimmed, $matches)) return new Nodes\Key($nodeString, $line, $matches); |
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else { |
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$first = $trimmed[0]; |
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$stringGroups = ['-', '>|' , '"\'', "#%" , "{[" , ":?" , '*&!']; |
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$methodGroups = ['Hyphen','Literal','Quoted','Special','Compact','SetElement','NodeAction']; |
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foreach ($stringGroups as $groupIndex => $stringRef) { |
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if (is_int(strpos($stringRef, $first))) { |
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$methodName = 'on'.$methodGroups[$groupIndex]; |
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try { |
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return self::$methodName($first, $nodeString, $line); |
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} catch (\Throwable $e) { |
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throw new \Exception(" could not create a Node ($methodName) for '$nodeString'", 1, $e); |
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} |
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} |
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} |
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} |
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return new Nodes\Scalar($nodeString, $line); |
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} |
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/** |
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* Return the correct Node Object between NodeComment OR NodeDirective |
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* |
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* @param string $nodeString The node string |
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* @param integer $line The line |
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* |
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* @return NodeGeneric |
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*/ |
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final private static function onSpecial(string $first, string $nodeString, int $line):NodeGeneric |
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{ |
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if ($first === "#") { |
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return new Nodes\Comment(ltrim($nodeString), $line); |
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} else { |
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if (preg_match(Regex::DIRECTIVE_TAG, $nodeString) |
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|| preg_match(Regex::DIRECTIVE_VERSION, $nodeString)) { |
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return new Nodes\Directive(ltrim($nodeString), $line); |
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} else { |
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throw new \ParseError("Invalid/Unknown Directive", 1); |
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} |
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} |
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} |
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/** |
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* Set $node type and value when $nodevalue starts with a quote (simple or double) |
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* |
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* @param string $nodeString The node value |
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* @param int $line The line |
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* |
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* @return NodeGeneric |
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*/ |
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final private static function onQuoted(string $first, string $nodeString, int $line):NodeGeneric |
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{ |
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return Regex::isProperlyQuoted(trim($nodeString)) ? new Nodes\Quoted($nodeString, $line) |
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: new Nodes\Partial($nodeString, $line); |
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} |
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/** |
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* Set $node type and value when NodeValue starts with a Set characters "?:" |
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* |
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* @param string $nodeString The node value |
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* @param int $line The line |
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* |
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* @return NodeGeneric |
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*/ |
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final private static function onSetElement(string $first, string $nodeString, int $line):NodeGeneric |
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{ |
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return $first === '?' ? new Nodes\SetKey($nodeString, $line) |
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: new Nodes\SetValue($nodeString, $line); |
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} |
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/** |
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* Determines the Node type and value when a compact object/array syntax is found |
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* |
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* @param string $nodeString The value assumed to start with { or [ or characters |
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* @param int $line The line |
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* |
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* @return NodeGeneric |
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*/ |
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final private static function onCompact(string $first, string $nodeString, int $line):NodeGeneric |
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{ |
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json_decode($nodeString, false, 512, self::JSON_OPTIONS); |
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if (json_last_error() === \JSON_ERROR_NONE) { |
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return new Nodes\JSON($nodeString, $line); |
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} else { |
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$backtrack_setting = "pcre.backtrack_limit"; |
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ini_set($backtrack_setting, "-1"); |
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$isMapping = preg_match(Regex::MAPPING, trim($nodeString)); |
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$isSequence = preg_match(Regex::SEQUENCE, trim($nodeString)); |
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ini_restore($backtrack_setting); |
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if (is_bool($isMapping) || is_bool($isSequence)) { |
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throw new \Exception("Regex Error for ".(is_bool($isMapping) ? 'mapping:' :'sequence:').preg_last_error()); |
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} |
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if ($isMapping) { |
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// var_dump(Regex::MAPPING, trim($nodeString)); |
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return new Nodes\CompactMapping($nodeString, $line); |
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} elseif ($isSequence) { |
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return new Nodes\CompactSequence($nodeString, $line); |
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} |
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} |
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return new Nodes\Partial($nodeString, $line); |
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} |
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/** |
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* Determines Node type and value when an hyphen "-" is found |
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* |
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* @param string $nodeString The node string value |
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* @param int $line The line |
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* |
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* @return NodeGeneric |
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*/ |
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final private static function onHyphen(string $first, string $nodeString, int $line):NodeGeneric |
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{ |
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if (substr($nodeString, 0, 3) === '---') return new Nodes\DocStart($nodeString, $line); |
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elseif ((bool) preg_match(Regex::ITEM, ltrim($nodeString))) return new Nodes\Item($nodeString, $line); |
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else { |
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return new Nodes\Scalar($nodeString, $line); |
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} |
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} |
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/** |
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* Sets Node type and value according to $nodeString when one of these characters is found : !,&,* |
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* |
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* @param string $nodeString The node value |
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* @param int $line The line |
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* |
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*@todo replace $action[0] with $first if applicable |
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*/ |
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final private static function onNodeAction(string $first, string $nodeString, int $line):NodeGeneric |
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{ |
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if (!((bool) preg_match(Regex::NODE_ACTIONS, trim($nodeString), $matches))) { |
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// var_dump("ACTION is scalar: '$nodeString'"); |
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return new Nodes\Scalar($nodeString, $line); |
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} |
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1 |
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if ($first === "!") { |
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return new Nodes\Tag($nodeString, $line); |
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} else { |
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return new Nodes\Anchor($nodeString, $line); |
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} |
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} |
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final private static function onLiteral(string $first, string $nodeString, int $line):NodeGeneric |
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{ |
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switch ($first) { |
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case '>': return new Nodes\LiteralFolded($nodeString, $line); |
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case '|': return new Nodes\Literal($nodeString, $line); |
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default: |
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throw new \ParseError("Not a literal node !! '$first' on line:$line"); |
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} |
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} |
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} |
dallgoot /
yaml
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