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<?php
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/**
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* @author Aleksandar Panic
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* @license http://www.apache.org/licenses/LICENSE-2.0
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* @since 1.0.0
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**/
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namespace ArekX\ArrayExpression;
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use ArekX\ArrayExpression\Interfaces\ValueParser;
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use ArekX\ArrayExpression\ValueParsers\ArrayValueParser;
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use ArekX\ArrayExpression\ValueParsers\ObjectValueParser;
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use ArekX\ArrayExpression\ValueParsers\SingleValueParser;
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/**
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* Class Evaluator
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*
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* Class which performs evaluation of arrays against passed values.
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*
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* @package ArekX\ArrayExpression
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*/
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class Evaluator
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{
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/**
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* Expression parser used.
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*
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* @var null|ExpressionParser
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*/
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protected $expressionParser = null;
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/**
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* Value Parser used for value retrieval.
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*
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* @var ValueParser
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*/
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protected $valueParser;
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/**
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* Evaluator constructor.
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* @param null|ExpressionParser $expressionParser Parser which will be used to parse array expression.
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*/
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public function __construct($expressionParser = null)
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{
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$this->expressionParser = $expressionParser;
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}
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/**
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* Creates new instance of an evaluator.
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*
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* @param null|ExpressionParser $expressionParser Parser which will be used to parse array expression.
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* @return static
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*/
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public static function create($expressionParser = null)
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{
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return new static($expressionParser);
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}
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/**
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* Run performs evaluation of expression against a value.
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*
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* @param array $expression Expression which will be used
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* @param mixed $value Value which will be used.
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* @return mixed
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* @throws Exceptions\TypeNotMappedException
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* @throws Exceptions\InvalidValueTypeException
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*/
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public function run(array $expression, $value)
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{
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return $this->getExpressionParser()
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->parse($expression)
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->evaluate($this->determineValueParser($value));
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}
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/**
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* Determines Value Parser from a value.
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*
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* @param mixed $value
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* @return ValueParser|ArrayValueParser|ObjectValueParser|SingleValueParser
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* @throws Exceptions\InvalidValueTypeException
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*/
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protected function determineValueParser($value)
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{
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$valueParser = $this->valueParser;
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if (is_array($value)) {
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if (!($this->valueParser instanceof ArrayValueParser)) {
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$valueParser = $this->valueParser = new ArrayValueParser();
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}
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$valueParser->setRaw($value);
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return $valueParser;
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}
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if (is_object($value)) {
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if (!($this->valueParser instanceof ObjectValueParser)) {
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$valueParser = $this->valueParser = new ObjectValueParser();
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}
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$valueParser->setRaw($value);
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return $valueParser;
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}
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if (!($valueParser instanceof SingleValueParser)) {
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$valueParser = $this->valueParser = new SingleValueParser();
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$valueParser->setRaw($value);
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}
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return $valueParser;
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}
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/**
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* Returns expression parser.
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*
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* @return ExpressionParser
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*/
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public function getExpressionParser()
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{
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if ($this->expressionParser === null) {
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$this->expressionParser = new DefaultExpressionParser();
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}
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return $this->expressionParser;
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}
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} |
ArekX /
array-expression-engine
