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<?php |
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/** |
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* @package s9e\SourceOptimizer |
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* @copyright Copyright (c) 2014-2018 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\SourceOptimizer; |
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abstract class ContextHelper |
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{ |
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/** |
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* Execute given callback on each namespace block in given stream |
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* |
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* @param TokenStream $stream Token stream |
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* @param callable $callback Callback |
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* @return void |
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*/ |
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public static function forEachNamespace(TokenStream $stream, callable $callback) |
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{ |
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foreach (self::getNamespaces($stream) as $block) |
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{ |
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call_user_func_array($callback, $block); |
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} |
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} |
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/** |
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* Execute given callback on each function block in given stream |
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* |
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* @param TokenStream $stream Token stream |
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* @param callable $callback Callback |
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* @return void |
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*/ |
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public static function forEachFunction(TokenStream $stream, callable $callback) |
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{ |
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foreach (self::getFunctionBlocks($stream) as $block) |
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{ |
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call_user_func_array($callback, $block); |
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} |
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} |
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/** |
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* Get the list of function blocks in given stream |
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* |
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* @param TokenStream $stream Token stream |
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* @return array[] List of arrays of [start, end] offsets |
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*/ |
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public static function getFunctionBlocks(TokenStream $stream) |
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{ |
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$blocks = []; |
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$stream->reset(); |
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while ($stream->skipTo(T_FUNCTION)) |
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{ |
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$offset = $stream->key(); |
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$stream->skipToToken('{'); |
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$cnt = 0; |
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while ($stream->valid()) |
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{ |
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$token = $stream->current(); |
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if ($token === '{') |
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{ |
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++$cnt; |
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} |
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elseif ($token === '}') |
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{ |
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if (--$cnt === 0) |
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{ |
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$blocks[] = [$offset, $stream->key()]; |
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break; |
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} |
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} |
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$stream->next(); |
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} |
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} |
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return $blocks; |
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} |
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/** |
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* Get the list of namespaces in given stream |
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* |
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* @param TokenStream $stream Token stream |
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* @return array[] List of arrays with namespace, start offset, end offset |
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*/ |
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public static function getNamespaces(TokenStream $stream) |
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{ |
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$namespaces = ['']; |
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$stream->reset(); |
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while ($stream->skipTo(T_NAMESPACE)) |
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{ |
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$offset = $stream->key(); |
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$stream->next(); |
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$stream->skipNoise(); |
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$namespace = ''; |
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while ($stream->valid()) |
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{ |
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$token = $stream->current(); |
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if (in_array($token, [';', '{'], true)) |
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{ |
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break; |
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} |
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$namespace .= $token[1]; |
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$stream->next(); |
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$stream->skipNoise(); |
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} |
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$namespaces[$offset] = $namespace; |
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} |
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$i = 0; |
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$blocks = []; |
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4 |
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foreach ($namespaces as $offset => $namespace) |
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{ |
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if ($i > 0) |
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{ |
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$blocks[$i - 1][2] = $offset - 1; |
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} |
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$blocks[] = [$namespace, $offset]; |
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++$i; |
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} |
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$blocks[$i - 1][2] = $stream->key() - 1; |
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return $blocks; |
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} |
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} |
s9e /
SourceOptimizer
