PHP short array

convert.php

<?php

/**
 * PHP 5.4 Short Array Syntax Converter
 *
 * Command-line script to convert PHP's "array()" syntax to PHP 5.4's
 * short 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($argc > 3) {
	file_put_contents('php://stderr', 'Usage: php convert.php [-w] <file>' . "\n");
	exit(1);
}
for($i = 1; $i < $argc; ++$i) {
	if($argv[$i] && $argv[$i][0] == '-') {
		$saveFile = ($argv[$i] == '-w');
	} else {
		$filePath = $argv[$i];
	}
}

if(!$filePath) {
	file_put_contents('php://stderr', 'Usage: php convert.php [-w] <file>' . "\n");
	exit(1);
} elseif(!file_exists($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 = [];
$offset = 0;
for($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]);
	
	// T_ARRAY could either mean the "array(...)" syntax we're looking for
	// or a type hinting statement ("function(array $foo) { ... }")
	if(is_array($tokens[$i]) && $tokens[$i][0] === T_ARRAY) {
		// Look for a subsequent opening bracket ("(") to be sure we're actually
		// looking at an "array(...)" statement
		$isArraySyntax = false;
		$subOffset = $offset;
		for($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] == '(') {
				$isArraySyntax = true;
				break;
			} elseif(!is_array($tokens[$j]) || $tokens[$j][0] !== T_WHITESPACE) {
				$isArraySyntax = false;
				break;
			}
		}
		
		if($isArraySyntax) {
			// Replace "array" and the opening bracket (including preceeding whitespace) with "["
			$replacements[] = [
				'start'  => $offset - strlen($tokens[$i][1]),
				'end'    => $subOffset,
				'string' => '[',
			];
			
			// Look for matching closing bracket (")")
			$subOffset = $offset;
			$openBracketsCount = 0;
			for($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[] = [
							'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($saveFile) {
	file_put_contents($filePath, $code);
} else {
	print $code;
}