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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2019 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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class CallbackGenerator |
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{ |
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/** |
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* @var array Path to callbacks in keys, callback signature in values |
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*/ |
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public $callbacks = [ |
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'tags.*.attributes.*.filterChain.*' => [ |
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'attrValue' => '*', |
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'attrName' => '!string' |
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], |
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'tags.*.filterChain.*' => [ |
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'tag' => '!Tag', |
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'tagConfig' => '!Object' |
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] |
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]; |
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/** |
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* @var Encoder |
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*/ |
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protected $encoder; |
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/** |
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* Constructor |
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*/ |
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public function __construct() |
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{ |
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$this->encoder = new Encoder; |
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} |
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/** |
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* Replace all callbacks in given config |
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* |
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* @param array $config Original config |
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* @return array Modified config |
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*/ |
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public function replaceCallbacks(array $config) |
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{ |
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foreach ($this->callbacks as $path => $params) |
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{ |
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$config = $this->mapArray($config, explode('.', $path), $params); |
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} |
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return $config; |
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} |
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/** |
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* Build the list of arguments used in a callback invocation |
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* |
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* @param array $params Callback parameters |
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* @param array $localVars Known vars from the calling scope |
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* @return string JavaScript code |
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*/ |
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protected function buildCallbackArguments(array $params, array $localVars) |
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{ |
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// Remove 'parser' as a parameter, since there's no such thing in JavaScript |
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unset($params['parser']); |
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// Rebuild the local vars map to include global vars and computed values |
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$localVars = array_combine(array_keys($localVars), array_keys($localVars)); |
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$localVars += [ |
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'innerText' => '(tag.getEndTag() ? text.substr(tag.getPos() + tag.getLen(), tag.getEndTag().getPos() - tag.getPos() - tag.getLen()) : "")', |
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'logger' => 'logger', |
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'openTags' => 'openTags', |
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'outerText' => 'text.substr(tag.getPos(), (tag.getEndTag() ? tag.getEndTag().getPos() + tag.getEndTag().getLen() - tag.getPos() : tag.getLen()))', |
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'registeredVars' => 'registeredVars', |
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'tagText' => 'text.substr(tag.getPos(), tag.getLen())', |
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'text' => 'text' |
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]; |
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$args = []; |
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foreach ($params as $k => $v) |
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{ |
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if (isset($v)) |
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{ |
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// Param by value |
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$args[] = $this->encoder->encode($v); |
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} |
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elseif (isset($localVars[$k])) |
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{ |
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// Param by name that matches a local var |
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$args[] = $k; |
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} |
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else |
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{ |
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$args[] = 'registeredVars[' . json_encode($k) . ']'; |
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} |
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} |
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return implode(',', $args); |
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} |
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/** |
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* Generate a function from a callback config |
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* |
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* @param array $config Callback config |
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* @param array $params Param names as keys, param types as values |
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* @return Code |
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*/ |
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protected function generateFunction(array $config, array $params) |
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{ |
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// returnFalse() and returnTrue() can be used as-is |
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if ($config['js'] == 'returnFalse' || $config['js'] == 'returnTrue') |
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{ |
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return new Code((string) $config['js']); |
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} |
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// Add an empty list of params if none is set |
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$config += ['params' => []]; |
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$src = $this->getHeader($params); |
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$src .= 'function(' . implode(',', array_keys($params)) . '){'; |
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$src .= 'return ' . $this->parenthesizeCallback($config['js']); |
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$src .= '(' . $this->buildCallbackArguments($config['params'], $params) . ');}'; |
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return new Code($src); |
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} |
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/** |
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* Generate a function header for given signature |
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* |
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* @param array $params Param names as keys, param types as values |
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* @return string |
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*/ |
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protected function getHeader(array $params) |
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{ |
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// Prepare the function's header |
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$header = "/**\n"; |
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foreach ($params as $paramName => $paramType) |
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{ |
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$header .= '* @param {' . $paramType . '} ' . $paramName . "\n"; |
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} |
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$header .= "*/\n"; |
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return $header; |
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} |
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/** |
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* Replace callbacks in given config array |
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* |
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* @param array $array Original config |
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* @param string[] $path Path to callbacks |
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* @param array $params Default params |
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* @return array Modified config |
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*/ |
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protected function mapArray(array $array, array $path, array $params) |
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{ |
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$key = array_shift($path); |
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$keys = ($key === '*') ? array_keys($array) : [$key]; |
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foreach ($keys as $key) |
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{ |
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if (!isset($array[$key])) |
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{ |
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continue; |
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} |
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$array[$key] = (empty($path)) ? $this->generateFunction($array[$key], $params) : $this->mapArray($array[$key], $path, $params); |
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} |
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return $array; |
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} |
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/** |
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* Add parentheses to a function literal, if necessary |
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* |
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* Will return single vars as-is, and will put anything else between parentheses |
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* |
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* @param string $callback Original callback |
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* @return string Modified callback |
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*/ |
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protected function parenthesizeCallback($callback) |
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{ |
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return (preg_match('(^[.\\w]+$)D', $callback)) ? $callback : '(' . $callback . ')'; |
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} |
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} |
s9e /
TextFormatter
