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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 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\TextFormatter\Configurator\JavaScript; |
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/** |
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* This class creates local variables to deduplicate complex configValues |
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*/ |
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class ConfigOptimizer |
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{ |
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/** |
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* @var array Associative array of ConfigValue instances |
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*/ |
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protected $configValues; |
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/** |
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* @var Encoder |
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*/ |
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protected $encoder; |
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/** |
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* @var array Associative array with the length of the JavaScript representation of each value |
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*/ |
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protected $jsLengths; |
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/** |
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* Constructor |
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* |
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* @param Encoder $encoder |
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*/ |
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public function __construct(Encoder $encoder) |
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{ |
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$this->encoder = $encoder; |
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$this->reset(); |
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} |
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/** |
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* Return the var declarations for all deduplicated config values |
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* |
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* @return string JavaScript code |
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*/ |
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public function getVarDeclarations() |
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{ |
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asort($this->jsLengths); |
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$src = ''; |
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foreach (array_keys($this->jsLengths) as $varName) |
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{ |
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$configValue = $this->configValues[$varName]; |
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if ($configValue->isDeduplicated()) |
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{ |
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$src .= 'const ' . $varName . '=' . $this->encoder->encode($configValue->getValue()) . ";\n"; |
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} |
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} |
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return $src; |
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} |
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/** |
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* Optimize given config object |
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* |
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* @param array|Dictionary $object Original config object |
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* @return array|Dictionary Modified config object |
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*/ |
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public function optimize($object) |
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{ |
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return current($this->optimizeObjectContent([$object]))->getValue(); |
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} |
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/** |
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* Clear the deduplicated config values stored in this instance |
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* |
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* @return void |
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*/ |
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public function reset() |
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{ |
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$this->configValues = []; |
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$this->jsLengths = []; |
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} |
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/** |
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* Test whether given value can be deduplicated |
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* |
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* @param mixed $value |
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* @return bool |
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*/ |
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protected function canDeduplicate($value) |
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{ |
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if (is_array($value) || $value instanceof Dictionary) |
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{ |
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// Do not deduplicate empty arrays and dictionaries |
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return (bool) count($value); |
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} |
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return ($value instanceof Code); |
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} |
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/** |
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* Mark ConfigValue instances that have been used multiple times |
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* |
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* @return void |
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*/ |
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protected function deduplicateConfigValues() |
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{ |
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arsort($this->jsLengths); |
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foreach (array_keys($this->jsLengths) as $varName) |
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{ |
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$configValue = $this->configValues[$varName]; |
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if ($configValue->getUseCount() > 1) |
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{ |
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$configValue->deduplicate(); |
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} |
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} |
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} |
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/** |
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* Return the name of the variable that will a given value |
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* |
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* @param string $js JavaScript representation of the value |
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* @return string |
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*/ |
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protected function getVarName($js) |
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{ |
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return sprintf('o%08X', crc32($js)); |
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} |
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/** |
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* Test whether given value is iterable |
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* |
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* @param mixed $value |
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* @return bool |
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*/ |
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protected function isIterable($value) |
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{ |
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return (is_array($value) || $value instanceof Dictionary); |
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} |
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/** |
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* Optimize given object's content |
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* |
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* @param array|Dictionary $object Original object |
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* @return array|Dictionary Modified object |
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*/ |
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protected function optimizeObjectContent($object) |
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{ |
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$object = $this->recordObject($object); |
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$this->deduplicateConfigValues(); |
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return $object->getValue(); |
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} |
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/** |
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* Record a given config object as a ConfigValue instance |
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* |
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* @param array|Code|Dictionary $object Original object |
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* @return ConfigValue Stored ConfigValue instance |
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*/ |
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protected function recordObject($object) |
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{ |
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$js = $this->encoder->encode($object); |
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$varName = $this->getVarName($js); |
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if ($this->isIterable($object)) |
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{ |
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$object = $this->recordObjectContent($object); |
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} |
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if (!isset($this->configValues[$varName])) |
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{ |
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$this->configValues[$varName] = new ConfigValue($object, $varName); |
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$this->jsLengths[$varName] = strlen($js); |
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} |
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$this->configValues[$varName]->incrementUseCount(); |
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return $this->configValues[$varName]; |
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} |
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/** |
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* Record the content of given config object |
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* |
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* @param array|Dictionary $object Original object |
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* @return array|Dictionary Modified object containing ConfigValue instances |
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*/ |
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protected function recordObjectContent($object) |
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{ |
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foreach ($object as $k => $v) |
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{ |
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if ($this->canDeduplicate($v) && !$this->shouldPreserve($v)) |
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{ |
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$object[$k] = $this->recordObject($v); |
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} |
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} |
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return $object; |
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} |
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/** |
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* Test whether given value should be preserved and not deduplicated |
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* |
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* @param mixed $value |
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* @return bool |
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*/ |
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protected function shouldPreserve($value) |
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{ |
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// Simple variables should be kept as-is |
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return ($value instanceof Code && preg_match('(^\\w+$)', $value)); |
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} |
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} |
s9e /
TextFormatter
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