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<?php |
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namespace Hateoas\Expression; |
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use Symfony\Component\ExpressionLanguage\ExpressionLanguage; |
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/** |
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* @author Adrien Brault <[email protected]> |
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* @author William Durand <[email protected]> |
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*/ |
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class ExpressionEvaluator |
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{ |
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const EXPRESSION_REGEX = '/expr\((?P<expression>.+)\)/'; |
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/** |
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* @var ExpressionLanguage |
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*/ |
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private $expressionLanguage; |
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/** |
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* @var array |
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*/ |
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private $context; |
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/** |
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* @var array |
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*/ |
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private $cache; |
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public function __construct(ExpressionLanguage $expressionLanguage, array $context = array(), array $cache = array()) |
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{ |
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$this->expressionLanguage = $expressionLanguage; |
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$this->context = $context; |
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$this->cache = $cache; |
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} |
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/** |
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* @param string $name |
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* @param mixed $value |
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*/ |
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public function setContextVariable($name, $value) |
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{ |
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$this->context[$name] = $value; |
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} |
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/** |
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* @param string $expression |
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* @param mixed $data |
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* @return mixed |
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*/ |
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public function evaluate($expression, $data) |
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{ |
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if (!is_string($expression)) { |
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return $expression; |
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} |
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$key = $expression; |
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if (!array_key_exists($key, $this->cache)) { |
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if (!preg_match(self::EXPRESSION_REGEX, $expression, $matches)) { |
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$this->cache[$key] = false; |
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} else { |
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$expression = $matches['expression']; |
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$context = $this->context; |
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$context['object'] = $data; |
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$this->cache[$key] = $this->expressionLanguage->parse($expression, array_keys($context)); |
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} |
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} |
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if (false !== $this->cache[$key]) { |
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if (!isset($context)) { |
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$context = $this->context; |
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$context['object'] = $data; |
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} |
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return $this->expressionLanguage->evaluate($this->cache[$key], $context); |
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} |
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return $expression; |
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} |
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public function evaluateArray(array $array, $data) |
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{ |
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$newArray = array(); |
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foreach ($array as $key => $value) { |
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$key = $this->evaluate($key, $data); |
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$value = is_array($value) ? $this->evaluateArray($value, $data) : $this->evaluate($value, $data); |
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$newArray[$key] = $value; |
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} |
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return $newArray; |
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} |
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/** |
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* Register a new new ExpressionLanguage function. |
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* |
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* @param ExpressionFunctionInterface $function |
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* |
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* @return ExpressionEvaluator |
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*/ |
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public function registerFunction(ExpressionFunctionInterface $function) |
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{ |
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$this->expressionLanguage->register( |
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$function->getName(), |
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$function->getCompiler(), |
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$function->getEvaluator() |
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); |
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foreach ($function->getContextVariables() as $name => $value) { |
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$this->setContextVariable($name, $value); |
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} |
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return $this; |
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} |
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} |
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willdurand /
Hateoas
