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

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File: src/eMacros/Runtime/Argument/ArgumentGet.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: 966 bytes
 

Contents

Class file image Download
<?php
namespace eMacros\Runtime\Argument;

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

class
ArgumentGet implements Applicable {
   
/**
     * Argument index to obtain
     * @var int
     */
   
public $index;
   
    public function
__construct($index = null) {
       
$this->index = $index;
    }
   
   
/**
     * Obtains argument at given index
     * Usage: (%0) (% _num)
     * Returns: mixed
     * (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;
        }
       
        if (!
array_key_exists($index, $scope->arguments)) {
            throw new \
UnexpectedValueException(sprintf("ArgumentGet: No parameter found at index %d.", $index));
        }
       
        return
$scope->arguments[$index];
    }
}
?>

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