File: src/eMacros/Runtime/Argument/ArgumentExists.php

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File: src/eMacros/Runtime/Argument/ArgumentExists.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: 839 bytes
 

Contents

Class file image Download
<?php

namespace eMacros\Runtime\Argument;

use
eMacros\Applicable;
use
eMacros\Scope;
use
eMacros\GenericList;

class
ArgumentExists implements Applicable {
   
/**
     * Argument index to check
     * @var int
     */
   
public $index;
   
    public function
__construct($index = null) {
       
$this->index = $index;
    }
   
   
/**
     * Checks if a given argument has been provided
     * Usage: (%1?) (%? _num)
     * Returns: boolean
     * (non-PHPdoc)
     * @see \eMacros\Applicable::apply()
     */
   
public function apply(Scope $scope, GenericList $arguments) {
        if (
is_null($this->index)) {
            if (
count($arguments) == 0) {
                throw new \
BadFunctionCallException("ArgumentGet: No index specified.");
            }
               
           
$index = intval($arguments[0]->evaluate($scope));
        }
        else {
           
$index = $this->index;
        }
       
        return
array_key_exists($index, $scope->arguments);
    }
}
?>

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