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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\RendererGenerators\PHP; |
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use RuntimeException; |
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use s9e\TextFormatter\Configurator\RecursiveParser; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\BooleanFunctions; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\BooleanOperators; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\Comparisons; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\Core; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\Math; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\MultiByteStringManipulation; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\PHP80Functions; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\SingleByteStringFunctions; |
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use s9e\TextFormatter\Configurator\RendererGenerators\PHP\XPathConvertor\Convertors\SingleByteStringManipulation; |
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class XPathConvertor |
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{ |
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/** |
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* @var array Array of togglable PHP features ("mbstring" and "php80") |
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*/ |
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public $features; |
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/** |
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* @var RecursiveParser |
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*/ |
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protected $parser; |
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/** |
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* Constructor |
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*/ |
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public function __construct(?RecursiveParser $parser = null) |
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{ |
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$this->features = [ |
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'mbstring' => extension_loaded('mbstring'), |
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'php80' => version_compare(PHP_VERSION, '8.0', '>=') |
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]; |
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if (isset($parser)) |
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{ |
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$this->parser = $parser; |
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} |
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} |
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/** |
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* Convert an XPath expression (used in a condition) into PHP code |
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* |
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* This method is similar to convertXPath() but it selectively replaces some simple conditions |
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* with the corresponding DOM method for performance reasons |
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* |
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* @param string $expr XPath expression |
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* @return string PHP code |
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*/ |
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public function convertCondition($expr) |
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{ |
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// Replace @attr with boolean(@attr) in boolean expressions |
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$expr = preg_replace( |
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'((^|(?<!\\bboolean)\\(\\s*|\\b(?:and|or)\\s*)([\\(\\s]*)([$@][-\\w]+|@\\*)([\\)\\s]*)(?=$|\\s+(?:and|or)))', |
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'$1$2boolean($3)$4', |
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trim($expr) |
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); |
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// Replace not(boolean(@attr)) with not(@attr) |
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$expr = preg_replace( |
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'(not\\(boolean\\(([$@][-\\w]+)\\)\\))', |
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'not($1)', |
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$expr |
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); |
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try |
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{ |
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return $this->getParser()->parse($expr)['value']; |
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} |
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catch (RuntimeException $e) |
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{ |
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// Do nothing |
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} |
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// If the condition does not seem to contain a relational expression, or start with a |
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// function call, we wrap it inside of a boolean() call |
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if (!preg_match('([=<>]|\\bor\\b|\\band\\b|^[-\\w]+\\s*\\()', $expr)) |
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{ |
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$expr = 'boolean(' . $expr . ')'; |
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} |
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return '$this->xpath->evaluate(' . $this->exportXPath($expr) . ',$node)'; |
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} |
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/** |
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* Convert an XPath expression (used as value) into PHP code |
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* |
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* @param string $expr XPath expression |
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* @return string PHP code |
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*/ |
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public function convertXPath($expr) |
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{ |
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$expr = trim($expr); |
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try |
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{ |
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return $this->getParser()->parse($expr)['value']; |
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} |
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catch (RuntimeException $e) |
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{ |
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// Do nothing |
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} |
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// Make sure the expression evaluates as a string |
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if (!preg_match('(^[-\\w]*s(?:late|pace|tring)[-\\w]*\\()', $expr)) |
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{ |
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$expr = 'string(' . $expr . ')'; |
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} |
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return '$this->xpath->evaluate(' . $this->exportXPath($expr) . ',$node)'; |
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} |
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/** |
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* Export an XPath expression as PHP with special consideration for XPath variables |
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* |
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* Will return PHP source representing the XPath expression, with special consideration for XPath |
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* variables which are returned as a method call to XPath::export() |
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* |
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* @param string $expr XPath expression |
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* @return string PHP representation of the expression |
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*/ |
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protected function exportXPath($expr) |
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{ |
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$phpTokens = []; |
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foreach ($this->tokenizeXPathForExport($expr) as [$type, $content]) |
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{ |
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$methodName = 'exportXPath' . $type; |
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$phpTokens[] = $this->$methodName($content); |
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} |
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return implode('.', $phpTokens); |
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} |
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/** |
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* Convert a "current()" XPath expression to its PHP source representation |
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* |
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* @return string |
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*/ |
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protected function exportXPathCurrent() |
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{ |
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return '$node->getNodePath()'; |
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} |
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/** |
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* Convert a fragment of an XPath expression to its PHP source representation |
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* |
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* @param string $fragment |
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* @return string |
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*/ |
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protected function exportXPathFragment($fragment) |
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{ |
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return var_export($fragment, true); |
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} |
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/** |
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* Convert an XSLT parameter to its PHP source representation |
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* |
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* @param string $param Parameter, including the leading $ |
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* @return string |
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*/ |
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protected function exportXPathParam($param) |
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{ |
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$paramName = ltrim($param, '$'); |
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return '$this->getParamAsXPath(' . var_export($paramName, true) . ')'; |
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} |
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/** |
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* Generate and return the a parser with the default set of matchers |
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* |
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* @return RecursiveParser |
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*/ |
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protected function getDefaultParser() |
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{ |
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$parser = new RecursiveParser; |
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$matchers = []; |
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$matchers[] = new SingleByteStringFunctions($parser); |
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$matchers[] = new BooleanFunctions($parser); |
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$matchers[] = new BooleanOperators($parser); |
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$matchers[] = new Comparisons($parser); |
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$matchers[] = new Core($parser); |
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$matchers[] = new Math($parser); |
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if (!empty($this->features['mbstring'])) |
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{ |
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$matchers[] = new MultiByteStringManipulation($parser); |
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} |
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$matchers[] = new SingleByteStringManipulation($parser); |
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if (!empty($this->features['php80'])) |
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{ |
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$matchers[] = new PHP80Functions($parser); |
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} |
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$parser->setMatchers($matchers); |
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return $parser; |
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} |
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/** |
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* Return (and if necessary, create) the cached instance of the XPath parser |
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* |
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* @return RecursiveParser |
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*/ |
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protected function getParser(): RecursiveParser |
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{ |
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if (!isset($this->parser)) |
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{ |
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$this->parser = $this->getDefaultParser(); |
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} |
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return $this->parser; |
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} |
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/** |
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* Tokenize an XPath expression for use in PHP |
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* |
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* @param string $expr XPath expression |
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* @return array |
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*/ |
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protected function tokenizeXPathForExport($expr) |
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{ |
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$tokenExprs = [ |
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'(*:Current)\\bcurrent\\(\\)', |
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'(*:Param)\\$\\w+', |
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'(*:Fragment)(?:"[^"]*"|\'[^\']*\'|(?!current\\(\\)|\\$\\w).)++' |
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]; |
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preg_match_all('(' . implode('|', $tokenExprs) . ')s', $expr, $matches, PREG_SET_ORDER); |
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$tokens = []; |
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foreach ($matches as $m) |
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{ |
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$tokens[] = [$m['MARK'], $m[0]]; |
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} |
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return $tokens; |
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} |
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} |