revert.php

#!/usr/bin/env php
<?php

/**
 * PHP 5.4 Short Array Syntax Reverter
 * 
 * Command-line script to convert PHP 5.4's short array "[]" syntax
 * to PHP 5.4's standard "array()" syntax using PHP's built-in tokenizer.
 * 
 * This script is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License (LGPL) as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 * 
 * This script is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 * 
 * @link      https://github.com/thomasbachem/php-short-array-syntax-converter
 * 
 * @link      http://php.net/manual/en/language.types.array.php
 * 
 * @license   http://www.gnu.org/licenses/lgpl.html
 * @author    Thomas Bachem <mail@thomasbachem.com>
 */


// - - - - - HANDLE COMMAND LINE ARGUMENTS - - - - -

$filePath = null;
$saveFile = false;

if ($argc > 3) {
    file_put_contents('php://stderr', 'Usage: php revert.php [-w] <file>' . "\n");
    exit(1);
}
for ($i = 1; $i < $argc; ++$i) {
    if ($argv[$i] && $argv[$i][0] == '-') {
        $saveFile = ($argv[$i] == '-w');
    } else {
        $filePath = $argv[$i];
    }
}

if (!$filePath) {
    file_put_contents('php://stderr', 'Usage: php revert.php [-w] <file>' . "\n");
    exit(1);
} elseif (!file_exists($filePath)) {
    file_put_contents('php://stderr', 'File "' . $filePath . '" not found.' . "\n");
    exit(1);
}


// - - - - - READ ORIGINAL CODE - - - - -

$code   = file_get_contents($filePath);
$tokens = token_get_all($code);


// - - - - - PARSE CODE - - - - -

$replacements = array();
$offset = 0;
for ($i = 0; $i < count($tokens); ++$i) {
    // Keep track of the current byte offset in the source code
    $offset += strlen(is_array($tokens[$i]) ? $tokens[$i][1] : $tokens[$i]);

    // "[" literal could either be an array index pointer
    // or an array definition
    if (is_string($tokens[$i]) && $tokens[$i] === '[') {
        // Assume we're looking at an array definition by default
        $isArraySyntax = true;
        $subOffset = $offset;
        for ($j = $i - 1; $j > 0; --$j) {
            $subOffset -= strlen(is_array($tokens[$j]) ? $tokens[$j][1] : $tokens[$j]);

            if (is_array($tokens[$j]) && $tokens[$j][0] === T_WHITESPACE) {
                $subOffset += strlen($tokens[$j][1]);
                continue;
            // Look for a previous variable or function return
            // to make sure we're not looking at an array pointer
            } elseif (
                (is_array($tokens[$j]) && ($tokens[$j][0] === T_VARIABLE || $tokens[$j][0] === T_STRING))
                || in_array($tokens[$j], array(')', ']', '}'), true)
            ) {
                $isArraySyntax = false;
                break;
            } else {
                break;
            }
        }

        if ($isArraySyntax) {
            // Replace "[" with "array("
            $replacements[] = array(
                'start'  => $offset - strlen($tokens[$i]),
                'end'    => $offset,
                'string' => 'array(',
            );

            // Look for matching closing bracket ("]")
            $subOffset = $offset;
            $openBracketsCount = 1;
            for ($j = $i + 1; $j < count($tokens); ++$j) {
                $subOffset += strlen(is_array($tokens[$j]) ? $tokens[$j][1] : $tokens[$j]);

                if (is_string($tokens[$j]) && $tokens[$j] == '[') {
                    ++$openBracketsCount;
                } elseif (is_string($tokens[$j]) && $tokens[$j] == ']') {
                    --$openBracketsCount;
                    if($openBracketsCount == 0) {
                        // Replace "]" with ")"
                        $replacements[] = array(
                            'start'  => $subOffset - 1,
                            'end'    => $subOffset,
                            'string' => ')',
                        );
                        break;
                    }
                }
            }
        }
    }
}


// - - - - - UPDATE CODE - - - - -

// Apply the replacements to the source code
$offsetChange = 0;
foreach ($replacements as $replacement) {
    $code = substr_replace($code, $replacement['string'], $replacement['start'] + $offsetChange, $replacement['end'] - $replacement['start']);
    $offsetChange += strlen($replacement['string']) - ($replacement['end'] - $replacement['start']);
}


// - - - - - OUTPUT/WRITE NEW CODE - - - - -

if ($saveFile) {
    if ($replacements) {
        file_put_contents($filePath, $code);
        print count($replacements) . ' replacements.' . "\n";
    } else {
        print 'No replacements.' . "\n";
    }
} else {
    print $code;
}