File: src/eMacros/Runtime/Collection/ArrayWalk.php

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File: src/eMacros/Runtime/Collection/ArrayWalk.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: 1,533 bytes
 

Contents

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<?php
namespace eMacros\Runtime\Collection;

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

class
ArrayWalk implements Applicable {
   
/**
     * Applies the user-defined callback function to each element of an array.
     * Usage: (Array::walk _arr _callback)
     * Returns: boolean
     * (non-PHPdoc)
     * @see \eMacros\Applicable::apply()
     */
   
public function apply(Scope $scope, GenericList $arguments) {
       
$nargs = count($arguments);
       
        if (
$nargs == 0) {
            throw new \
BadFunctionCallException("ArrayWalk: No target specified.");
        }
        elseif (
$nargs == 1) {
            throw new \
BadFunctionCallException("ArrayWalk: No callback specified.");
        }
       
       
$target = $arguments[0];
       
        if (!(
$target instanceof Symbol)) {
            throw new \
InvalidArgumentException(sprintf("ArrayWalk: Expected symbol as first argument but %s was found instead.", substr(strtolower(strstr(get_class($arguments[0]), '\\')), 1)));
        }
       
       
$ref = $target->symbol;
       
        if (
is_array($scope->symbols[$ref]) || $scope->symbols[$ref] instanceof \ArrayObject) {
           
$op = $arguments[1]->evaluate($scope);
           
            if (
is_callable($op)) {
               
$userdata = $nargs > 2 ? $arguments[2]->evaluate($scope) : null;
                return
array_walk($scope->symbols[$ref], $op, $userdata);
            }
           
            throw new \
InvalidArgumentException("ArrayWalk: Expected callable as second argument.");
        }
       
        throw new \
InvalidArgumentException(sprintf("ArrayWalk: Expected array as first argument but %s was found instead.", gettype($scope->symbols[$ref])));
    }
}
?>

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