bb-drummer/phpagstract

<?php
namespace PHPagstract\Symbol;


use PHPagstract\Symbol\Symbols\SymbolCollection;
use PHPagstract\Symbol\Symbols\SymbolFactory;
use PHPagstract\Token\Tokens\TokenCollection;

/**
 * symbol resolver object class
 * 
 * @package   PHPagstract
 * @author    Björn Bartels <coding@bjoernbartels.earth>
 * @link      https://gitlab.bjoernbartels.earth/php/phpagstract
 * @license   http://www.apache.org/licenses/LICENSE-2.0 Apache License, Version 2.0
 * @copyright copyright (c) 2016 Björn Bartels <coding@bjoernbartels.earth>
 */
class GenericSymbolizer
{
    /**
     * throw exception on error?
     * 
     * @var boolean 
     */
    protected $throwOnError;
    
    /**
     * @param boolean $throwOnError throw exception on error?
     */
    public function __construct($throwOnError = false) 
    {
        $this->throwOnError = $throwOnError;
    }
    
    /**
     * map tokens to symbols
     *
     * @param  \PHPagstract\Token\Tokens\TokenCollection $tokens
     * @return SymbolCollection
     */
    public function resolve($tokens) 
    {

        $symbols = new SymbolCollection();

        $tokenTree = $tokens->getIterator();
        if ($tokenTree !== null) {
            $tokenTree->rewind();
            $currentToken = $tokenTree->current();
            while ($currentToken) {
                $symbol = SymbolFactory::symbolize(
                    $currentToken,
                    $this->throwOnError
                );
                if ($symbol === false) {
                    // Error condition ? 
                    // maybe add a fallback here ?!
                
                    // Error has occurred, so we stop.
                    break;
                }
                
                if (method_exists($currentToken, 'hasChildren') && $currentToken->hasChildren()) {
                    $tokenChildren = $currentToken->getChildren();
                    $children = new TokenCollection();
                    foreach ($tokenChildren as $child) {
                        $children[] = $child;
                    }
                    $symbolChildren = $this->resolve($children);
                    $symbol->setChildren($symbolChildren);
                }
                
                $symbols[] = $symbol;
                
                $tokenTree->next();
                $currentToken = $tokenTree->current();
                
            };
        }
        
        return $symbols;
        
    }
    
}