advagg_css_compress.module

<?php


/**
 * @file
 * Advanced aggregation css compression module.
 *
 */

/**
 * Default value to see if CSSTidy will preserve CSS.
 */
define('ADVAGG_CSS_COMPRESS_PRESERVE_CSS', TRUE);

/**
 * Default value to see if this will compress aggregated files.
 */
define('ADVAGG_CSS_COMPRESS_AGG_FILES', TRUE);

/**
 * Default value to see if this will compress inline css.
 */
define('ADVAGG_CSS_COMPRESS_INLINE', TRUE);

/**
 * Default value to see if this will cache the compressed inline css.
 */
define('ADVAGG_CSS_COMPRESS_INLINE_CACHE', TRUE);

/**
 * Default value for which css compression library to use.
 */
define('ADVAGG_CSS_COMPRESSOR', 1);

/**
 * Default value for which css compression library to use.
 */
define('ADVAGG_CSS_COMPRESS_COMPRESSOR_LEVEL', 'sane');

/**
 * Implements hook_menu().
 */
function advagg_css_compress_menu() {
    $items = array();
    $file_path = drupal_get_path('module', 'advagg_css_compress');
    $items['admin/config/advagg/css-compress'] = array(
        'title' => 'CSS Compression',
        'description' => 'Adjust CSS Compression settings.',
        'page callback' => 'advagg_css_compress_admin_page',
        'type' => MENU_LOCAL_TASK,
        'access arguments' => array(
            'administer site configuration',
        ),
        'file path' => $file_path,
        'file' => 'advagg_css_compress.admin.inc',
        'weight' => 10,
    );
    return $items;
}

/**
 * Implements hook_advagg_css_alter().
 */
function advagg_css_compress_advagg_css_alter(&$contents, $files, $bundle_md5) {
    if (!variable_get('advagg_css_compress_agg_files', ADVAGG_CSS_COMPRESS_AGG_FILES)) {
        return;
    }
    $compressor = variable_get('advagg_css_compressor', ADVAGG_CSS_COMPRESSOR);
    if ($compressor == 0) {
        advagg_css_compress_css_tidy($contents);
    }
    if ($compressor == 1) {
        advagg_css_compress_css_compressor($contents);
    }
}

/**
 * Implements hook_advagg_css_inline_alter().
 */
function advagg_css_compress_advagg_css_inline_alter(&$contents) {
    if (!variable_get('advagg_css_compress_inline', ADVAGG_CSS_COMPRESS_INLINE)) {
        return;
    }
    $compressor = variable_get('advagg_css_compressor', ADVAGG_CSS_COMPRESSOR);
    // If using a cache, try to get the contents of it.
    if (variable_get('advagg_css_compress_inline_cache', ADVAGG_CSS_COMPRESS_INLINE_CACHE)) {
        $key = md5($contents) . $compressor;
        $table = 'cache_advagg_css_compress_inline';
        $data = cache_get($key, $table);
        if (!empty($data->data)) {
            $contents = $data->data;
            return;
        }
    }
    if ($compressor == 0) {
        advagg_css_compress_css_tidy($contents);
    }
    if ($compressor == 1) {
        advagg_css_compress_css_compressor($contents);
    }
    // If using a cache set it.
    if (isset($key)) {
        cache_set($key, $contents, $table, CACHE_TEMPORARY);
    }
}

/**
 * Use the CSS Tidy library to compress the CSS.
 *
 * TODO have set_cfg be fully configurable from GUI.
 */
function advagg_css_compress_css_tidy(&$contents) {
    // Initialize CSSTidy.
    $filename = drupal_get_path('module', 'advagg_css_compress') . '/csstidy/class.csstidy.inc';
    include_once DRUPAL_ROOT . '/' . $filename;
    $css = new csstidy();
    // Try to allocate enough time to run CSSTidy.
    if (function_exists('set_time_limit')) {
        @set_time_limit(240);
    }
    // Set configuration.
    $css->set_cfg('preserve_css', variable_get('advagg_css_compress_preserve_css', ADVAGG_CSS_COMPRESS_PRESERVE_CSS));
    $css->set_cfg('remove_last_;', TRUE);
    $css->set_cfg('merge_selectors', TRUE);
    $css->set_cfg('optimise_shorthands', TRUE);
    $css->set_cfg('silent', TRUE);
    $css->set_cfg('compress_colors', TRUE);
    $css->set_cfg('sort_selectors', FALSE);
    $css->set_cfg('sort_properties', FALSE);
    $css->set_cfg('discard_invalid_properties', FALSE);
    $css->set_cfg('timestamp', FALSE);
    $css->load_template("highest_compression");
    // Compress CSS.
    $css->parse($contents);
    $contents = $css->print
        ->plain();
}

/**
 * Use the CSS Compressor library to compress the CSS.
 *
 * TODO have compression level be selectable from GUI.
 */
function advagg_css_compress_css_compressor(&$contents) {
    // Initialize CSSTidy.
    $filename = drupal_get_path('module', 'advagg_css_compress') . '/css-compressor-3.x/src/CSSCompression.inc';
    include_once DRUPAL_ROOT . '/' . $filename;
    $CSSC = new CSSCompression(variable_get('advagg_css_compress_compressor_level', ADVAGG_CSS_COMPRESS_COMPRESSOR_LEVEL));
    $contents = $CSSC->compress($contents);
}

/**
 * Implements hook_flush_caches().
 */
function advagg_css_compress_flush_caches() {
    return array(
        'cache_advagg_css_compress_inline',
    );
}