#!/usr/bin/php
<?php

require_once 'common.php';
assertCli();

/**
 * Compiles all of HTML Purifier's library files into one big file
 * named HTMLPurifier.standalone.php.
 */

/**
 * Global hash that tracks already loaded includes
 */
$GLOBALS['loaded'] = array('HTMLPurifier.php' => true);

/**
 * Custom FSTools for this script that overloads some behavior
 * @warning The overloading of copy() is not necessarily global for
 *          this script. Watch out!
 */
class MergeLibraryFSTools extends FSTools
{
    function copyable($entry) {
        // Skip hidden files
        if ($entry[0] == '.') {
            return false;
        }
        return true;
    }
    function copy($source, $dest) {
        copy_and_remove_includes($source, $dest);
    }
}
$FS = new MergeLibraryFSTools();

/**
 * Replaces the includes inside PHP source code with the corresponding
 * source.
 * @param string $text PHP source code to replace includes from
 */
function replace_includes($text) {
    return preg_replace_callback(
        "/require_once ['\"]([^'\"]+)['\"];/",
        'replace_includes_callback',
        $text
    );
}

/**
 * Removes leading PHP tags from included files. Assumes that there is
 * no trailing tag.
 * @note This is safe for files that have internal <?php
 * @param string $text Text to have leading PHP tag from
 */
function remove_php_tags($text) {
    return substr($text, 5);
}

/**
 * Creates an appropriate blank file, recursively generating directories
 * if necessary
 * @param string $file Filename to create blank for
 */
function create_blank($file) {
    global $FS;
    $dir = dirname($file);
    $base = realpath('../tests/blanks/') . DIRECTORY_SEPARATOR ;
    if ($dir != '.') {
        $FS->mkdir($base . $dir);
    }
    file_put_contents($base . $file, '');
}

/**
 * Copies the contents of a directory to the standalone directory
 * @param string $dir Directory to copy
 */
function make_dir_standalone($dir) {
    global $FS;
    return $FS->copyr($dir, 'standalone/' . $dir);
}

/**
 * Copies the contents of a file to the standalone directory
 * @param string $file File to copy
 */
function make_file_standalone($file) {
    global $FS;
    $FS->mkdir('standalone/' . dirname($file));
    copy_and_remove_includes($file, 'standalone/' . $file);
    return true;
}

/**
 * Copies a file to another location recursively, if it is a PHP file
 * remove includes
 * @param string $file Original file
 * @param string $sfile New location of file
 */
function copy_and_remove_includes($file, $sfile) {
    $contents = file_get_contents($file);
    if (strrchr($file, '.') === '.php') $contents = replace_includes($contents);
    return file_put_contents($sfile, $contents);
}

/**
 * @param $matches preg_replace_callback matches array, where index 1
 *        is the filename to include
 */
function replace_includes_callback($matches) {
    $file = $matches[1];
    $preserve = array(
      // PHP 5 only
      'HTMLPurifier/Lexer/DOMLex.php' => 1,
      'HTMLPurifier/Printer.php' => 1,
      // PEAR (external)
      'XML/HTMLSax3.php' => 1
    );
    if (isset($preserve[$file])) {
        return $matches[0];
    }
    if (isset($GLOBALS['loaded'][$file])) return '';
    $GLOBALS['loaded'][$file] = true;
    create_blank($file);
    return replace_includes(remove_php_tags(file_get_contents($file)));
}

chdir(dirname(__FILE__) . '/../library/');
create_blank('HTMLPurifier.php');

echo 'Creating full file...';
$contents = replace_includes(file_get_contents('HTMLPurifier.php'));
$contents = str_replace(
    "define('HTMLPURIFIER_PREFIX', dirname(__FILE__));",
    "define('HTMLPURIFIER_PREFIX', dirname(__FILE__) . '/standalone');
set_include_path(HTMLPURIFIER_PREFIX . PATH_SEPARATOR . get_include_path());",
    $contents
);
file_put_contents('HTMLPurifier.standalone.php', $contents);
echo ' done!' . PHP_EOL;

echo 'Creating standalone directory...';
$FS->rmdirr('standalone'); // ensure a clean copy

// data files
$FS->mkdir('standalone/HTMLPurifier/DefinitionCache/Serializer');
make_dir_standalone('HTMLPurifier/EntityLookup');

// non-standard inclusion setup
make_dir_standalone('HTMLPurifier/Language');

// optional components
make_file_standalone('HTMLPurifier/Printer.php'); 
make_dir_standalone('HTMLPurifier/Printer');
make_dir_standalone('HTMLPurifier/Filter');
make_file_standalone('HTMLPurifier/Lexer/PEARSax3.php');

// PHP 5 only files
make_file_standalone('HTMLPurifier/Lexer/DOMLex.php');
make_file_standalone('HTMLPurifier/Lexer/PH5P.php');
echo ' done!' . PHP_EOL;