how to get the code str which a PHPParser Node is representing? about php-parser HOT 4 CLOSED

<?php
class LexerWithTokenOffsets extends PHPParser_Lexer {
    public function getNextToken(&$value = null, &$startAttributes = null, &$endAttributes = null) {
        $tokenId = parent::getNextToken($value, $startAttributes, $endAttributes);
        $startAttributes['startOffset'] = $endAttributes['endOffset'] = $this->pos;
        return $tokenId;
    }
}

<?php
function getNodeCode($code, PHPParser_Node $node) {
    $startOffset = $node->getAttribute('startOffset');
    $endOffset = $node->getAttribute('endOffset');
    if ($startOffset === null || $endOffset === null) {
        return ''; // just to be sure
    }

    return substr($code, $startOffset, $endOffset - $startOffset);
}

echo getNodeCode($code, $echoNode); // echo 'Hi ', hi\\getTarget();

<?php
function getArrayCode($code, array $nodes) {
    if (empty($nodes)) return '';
    $startOffset = $nodes[0]->getAttribute('startOffset');
    $endOffset = $nodes[count($nodes) - 1]->getAttribute('endOffset');
    if ($startOffset === null || $endOffset === null) return '';

    return substr($code, $startOffset, $endOffset - $startOffset);
}

echo getArrayCode($code, $echoNode->exprs); // 'Hi ', hi\\getTarget()

<?php
class LexerWithTokenOffsets extends PHPParser_Lexer {
    public function getNextToken(&$value = null, &$startAttributes = null, &$endAttributes = null) {
        $tokenId = parent::getNextToken($value, $startAttributes, $endAttributes);
        $startAttributes['startOffset'] = $endAttributes['endOffset'] = $this->pos;
        return $tokenId;
    }
}

class NodeCodeFetcher {
    private $code;
    private $tokenToStartOffset = array();
    private $tokenToEndOffset = array();

    public function __construct($code) {
        $this->code = $code;

        $tokens = token_get_all($code);
        $offset = 0;
        foreach ($tokens as $pos => $token) {
            if (is_array($token)) {
                $len = strlen($token[1]);
            } else {
                $len = strlen($token); // not 1 due to b" bug
            }

            $this->tokenToStartOffset[$pos] = $offset;
            $offset += $len;
            $this->tokenToEndOffset[$pos] = $offset;
        }
    }

    public function getNodeCode(PHPParser_Node $node) {
        $startPos = $node->getAttribute('startOffset');
        $endPos = $node->getAttribute('endOffset');
        if ($startPos === null || $endPos === null) {
            return ''; // just to be sure
        }

        $startOffset = $this->tokenToStartOffset[$startPos];
        $endOffset = $this->tokenToEndOffset[$endPos];
        return substr($this->code, $startOffset, $endOffset - $startOffset);
    }
}

<?php

$code = <<<'CODE'
<?php array('author_id' => $data_id,'abc'=>array('ok'=>3,'no'=>$data_id+1));
CODE;

$parser = new PHPParser_Parser(new LexerWithTokenOffsets);
$stmts = $parser->parse($code);
$codeFetcher = new NodeCodeFetcher($code);

var_dump($codeFetcher->getNodeCode($stmts[0]->items[0])); // 'author_id' => $data_id
var_dump($codeFetcher->getNodeCode($stmts[0]->items[1])); // 'abc'=>array('ok'=>3,'no'=>$data_id+1)
var_dump($codeFetcher->getNodeCode($stmts[0]->items[1]->value->items[0])); // 'ok'=>3
var_dump($codeFetcher->getNodeCode($stmts[0]->items[1]->value->items[1])); // 'no'=>$data_id+1
var_dump($codeFetcher->getNodeCode($stmts[0]->items[1]->value->items[1]->value)); // $data_id+1