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

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File: src/eMacros/Runtime/Collection/ArrayUnshift.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: 1,789 bytes
 

Contents

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<?php
namespace eMacros\Runtime\Collection;

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

class
ArrayUnshift implements Applicable {
   
/**
     * Prepends passed elements to the front of the array
     * Usage: (Array::unshift _arr "apple" "raspberry")
     * Returns: int
     * (non-PHPdoc)
     * @see \eMacros\Applicable::apply()
     */
   
public function apply(Scope $scope, GenericList $arguments) {
       
$nargs = count($arguments);
       
        if (
$nargs == 0) {
            throw new \
BadFunctionCallException("ArrayUnshift: No target specified.");
        }
        elseif (
$nargs == 1) {
            throw new \
BadFunctionCallException("ArrayUnshift: No values specified.");
        }
       
       
$target = $arguments[0];
       
        if (!(
$target instanceof Symbol)) {
            throw new \
InvalidArgumentException(sprintf("ArrayUnshift: Expected symbol as first argument but %s was found instead.", substr(strtolower(strstr(get_class($arguments[0]), '\\')), 1)));
        }
       
       
$ref = $target->symbol;
       
       
$args = array();
       
$it = $arguments->getIterator();
       
$it->rewind();
       
        for (
$it->next(); $it->valid(); $it->next()) {
           
$args[] = $it->current()->evaluate($scope);
        }
       
        if (
is_array($scope->symbols[$ref])) {
            foreach (
array_reverse($args) as $arg) {
               
array_unshift($scope->symbols[$ref], $arg);
            }
               
            return
count($scope->symbols[$ref]);
        }
        elseif (
$scope->symbols[$ref] instanceof \ArrayObject) {
           
$arr = $scope->symbols[$ref]->getArrayCopy();
           
            foreach (
array_reverse($args) as $arg) {
               
array_unshift($arr, $arg);
            }
           
           
$scope->symbols[$ref]->exchangeArray($arr);
            return
count($scope->symbols[$ref]);
        }
       
        throw new \
InvalidArgumentException(sprintf("ArrayUnshift: Expected array as first argument but %s was found instead.", gettype($scope->symbols[$ref])));
    }
}
?>

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