<?php
namespace eMacros\Runtime\Comparison;
use eMacros\Runtime\GenericFunction;
abstract class ComparisonPredicate extends GenericFunction {
protected $logicalOr = false;
/**
* Compares various operands
* Usage: (== 1 2) (>= 4 3) (=== "1" 1)
* Returns: boolean
* (non-PHPdoc)
* @see \eMacros\Runtime\GenericFunction::execute()
*/
public function execute(array $operands) {
if (empty($operands)) {
throw new \BadFunctionCallException(sprintf("%s: No objects to compare.", get_class($this)));
}
if (!isset($operands[1])) {
throw new \BadFunctionCallException(sprintf("%s: Cannot compare single object.", get_class($this)));
}
$fst = array_shift($operands);
$or = $this->logicalOr;
foreach ($operands as $val) {
if ($or xor !$this->compare($fst, $val)) {
return $or;
}
$fst = $val;
}
return !$or;
}
abstract protected function compare($a, $b);
}
?>
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