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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\Operators;
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use ArekX\ArrayExpression\Exceptions\InvalidEvaluationResultType;
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use ArekX\ArrayExpression\Interfaces\ExpressionParser;
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use ArekX\ArrayExpression\Interfaces\Operator;
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use ArekX\ArrayExpression\Interfaces\ValueParser;
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/**
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* Class ConcatOperator
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* Operator for returning concatenated strings
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*
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* @package ArekX\ArrayExpression\Operators
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*/
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class ConcatOperator extends BaseOperator
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{
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/**
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* Expressions of which will be in concat operation.
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*
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* @var Operator[]
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*/
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public $concatOperators = [];
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/**
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* Passes data from operator configuration.
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*
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* Depending on the operator this data can contain other sub-expressions which need to be parsed using
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* ExpressionParser
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*
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* @param array $config Expressions to be processed
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* @see ExpressionParser
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*/
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public function configure(array $config)
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{
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$this->setName($config[0] ?? 'unknown');
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if (count($config) < 2) {
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throw new \InvalidArgumentException("Minimum format must be satisfied: ['{$this->getName()}', <expression>]");
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}
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$this->concatOperators = [];
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$maxCount = count($config);
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for ($i = 1; $i < $maxCount; $i++) {
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$this->assertIsExpression($config[$i]);
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$this->concatOperators[] = $this->parser->parse($config[$i]);
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}
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}
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/**
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* Evaluates one value.
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*
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* @param ValueParser $value Value to be evaluated
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* @return string Evaluation result
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* @throws InvalidEvaluationResultType
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*/
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public function evaluate(ValueParser $value)
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{
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$result = "";
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foreach ($this->concatOperators as $operator) {
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$concatResult = $operator->evaluate($value);
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if (!is_string($concatResult)) {
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throw new InvalidEvaluationResultType($concatResult, 'string');
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}
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$result .= $concatResult;
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}
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return $result;
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}
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} |
ArekX /
array-expression-engine
