File: src/eMacros/Runtime/Comparison/ComparisonPredicate.php

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File: src/eMacros/Runtime/Comparison/ComparisonPredicate.php
Role: Class source
Content type: text/plain
Description: Class source
Class: eMacros
PHP LISP language interpreter
Author: By
Last change:
Date: 7 years ago
Size: 921 bytes
 

Contents

Class file image Download
<?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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