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<?php
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/**
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* @file
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* Allows administrators to inject CSS into the page output based on
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* configurable rules. Useful for adding simple CSS tweaks without modifying
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* a site's official theme.
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*/
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/**
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* Deploy this CSS snippet on every page except the listed pages.
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*/
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define('CSS_INJECTOR_PAGES_NOTLISTED', 0);
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/**
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* Deploy this CSS snippet on only the listed pages.
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*/
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define('CSS_INJECTOR_PAGES_LISTED', 1);
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/**
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* Deploy this CSS snippet only if the associated PHP code returns TRUE.
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*/
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define('CSS_INJECTOR_PHP', 2);
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/**
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* Implements hook_help().
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*/
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function css_injector_help($path, $arg) {
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$output = '';
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switch ($path) {
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case 'admin/config/modules#description':
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$output .= t('Allows administrators to inject CSS into the page output based on configurable rules.');
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break;
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case 'admin/config/development/css-injector':
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$output .= '<p>' . t('Use CSS injection rules to add small snippets of CSS to the page output when specific criteria are met. For example, a simple rule could change the page background color at night or float a particular div to the right on node editing pages.') . '</p>';
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break;
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}
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return $output;
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}
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/**
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* Implements hook_init().
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* Checks to see whether any CSS files should be added to the current page,
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* based on rules configured by the site administrator.
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*/
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function css_injector_init() {
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$css_rules = _css_injector_load_rule();
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foreach ($css_rules as $css_rule) {
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if (!isset($css_rule['enabled']) || $css_rule['enabled']) {
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if (_css_injector_evaluate_rule($css_rule)) {
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$file_uri = _css_injector_rule_uri($css_rule['crid']);
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$theme_rules = unserialize($css_rule['rule_themes']);
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global $theme;
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if (!is_array($theme_rules) || empty($theme_rules) || in_array($theme, $theme_rules, true)) {
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switch ($css_rule['media']) {
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case 'all':
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case 'screen':
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case 'print':
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drupal_add_css($file_uri, array('type' => 'file','group' => CSS_THEME,'media' => $css_rule['media'],'preprocess' => $css_rule['preprocess']));
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break;
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case 'IE 7':
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case 'IE 8':
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case 'IE 9':
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drupal_add_css($file_uri, array(
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'group' => CSS_THEME,
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'browsers' => array('IE' => $css_rule['media'], '!IE' => FALSE),
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'preprocess' => $css_rule['preprocess'])
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);
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break;
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}
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}
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}
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}
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}
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}
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/**
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* Implements hook_css_alter().
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* Since we're trying to give the administrator complete control, we'll move
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* CSS that this module has added to a high weight, higher even than the theme's
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* CSS files. Currently the weight is 200 + the crid, which is currently higher
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* than Bartik's CSS.
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*
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* @param $css
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* The array of CSS files.
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*/
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function css_injector_css_alter(&$css) {
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$css_rules = _css_injector_load_rule();
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foreach ($css_rules as $css_rule) {
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$file_uri = _css_injector_rule_uri($css_rule['crid']);
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if (!empty($css[$file_uri])) {
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$css[$file_uri]['weight'] = 200 + $css_rule['crid'];
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}
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}
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}
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/**
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* Implements hook_menu().
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* Defines menu callbacks for CSS Injector's configuration pages.
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*/
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function css_injector_menu() {
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$items = array(
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'admin/config/development/css-injector' => array(
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'title' => 'CSS injector',
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'description' => 'Add CSS to the page output based on configurable rules.',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('css_injector_admin_form'),
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'access arguments' => array('administer css injection'),
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'file' => 'css_injector.admin.inc',
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),
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'admin/config/development/css-injector/edit' => array(
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'title' => 'Edit CSS injector rule',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('css_injector_edit'),
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'access arguments' => array('administer css injection'),
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'file' => 'css_injector.admin.inc',
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'type' => MENU_CALLBACK,
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),
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'admin/config/development/css-injector/add' => array(
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'title' => 'Add CSS injector rule',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('css_injector_edit'),
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'access arguments' => array('administer css injection'),
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'file' => 'css_injector.admin.inc',
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'type' => MENU_CALLBACK,
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),
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'admin/config/development/css-injector/delete' => array(
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'title' => 'Delete CSS injector rule',
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'page callback' => 'drupal_get_form',
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'page arguments' => array('css_injector_delete_confirm'),
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'access arguments' => array('administer css injection'),
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'file' => 'css_injector.admin.inc',
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'type' => MENU_CALLBACK,
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),
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);
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return $items;
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}
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/**
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* Implements hook_theme().
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*/
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function css_injector_theme() {
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$items['css_injector_admin_form'] = array(
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'render element' => 'form',
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'file' => 'css_injector.admin.inc',
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);
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return $items;
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}
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/**
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* Implements hook_permission().
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*/
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function css_injector_permission() {
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return array(
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'administer css injection' => array(
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'title' => t('Administer CSS Injection'),
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),
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);
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}
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/**
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* Helper function to load all CSS injection rules.
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*/
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function _css_injector_load_rule($crid = NULL, $reset = FALSE) {
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static $rules;
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// TODO: Change to drupal_static_fast pattern.
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if (!isset($rules) || $reset) {
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if (!$reset && ($cache = cache_get('css_injector:rules')) && !empty($cache->data)) {
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$rules = $cache->data;
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}
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else {
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$rules = array();
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$results = db_query("SELECT * FROM {css_injector_rule}", array(), array('fetch' => PDO::FETCH_ASSOC))->fetchAllAssoc('crid');
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foreach ($results as $id => $rule) {
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$rules[$id] = $rule;
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}
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cache_set('css_injector:rules', $rules);
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}
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}
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if (is_numeric($crid)) {
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return $rules[$crid];
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}
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else {
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return $rules;
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}
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}
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/**
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* Helper function to delete an existing rule and its accompanying file.
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*/
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function _css_injector_delete_rule($crid) {
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if ($rule = _css_injector_load_rule($crid)) {
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file_unmanaged_delete(_css_injector_rule_uri($crid));
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db_delete('css_injector_rule')
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->condition('crid', $crid)
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->execute();
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drupal_set_message(t('The CSS rule %title has been deleted.', array('%title' => $rule['title'])));
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}
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}
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/**
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* Helper function to determine whether a rule's conditions are met.
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*
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* @param $css_rule
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* Array describing the rule.
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*/
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function _css_injector_evaluate_rule($css_rule = array()) {
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// Match path if necessary.
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if (!empty($css_rule['rule_conditions'])) {
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if ($css_rule['rule_type'] < CSS_INJECTOR_PHP) {
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$path = drupal_get_path_alias($_GET['q']);
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// Compare with the internal and path alias (if any).
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$page_match = drupal_match_path($path, $css_rule['rule_conditions']);
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if ($path != $_GET['q']) {
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$page_match = $page_match || drupal_match_path($_GET['q'], $css_rule['rule_conditions']);
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}
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// When $css_rule['rule_type'] has a value of
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// CSS_INJECTOR_PAGES_NOTLISTED, the rule is matched on
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// all pages except those listed in $css_rule['rule_conditions'].
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// When set to CSS_INJECTOR_PAGES_LISTED, it is displayed only on those
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// pages listed in $css_rule['rule_type'].
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$page_match = !($css_rule['rule_type'] xor $page_match);
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}
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else {
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if (module_exists('php')) {
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$page_match = php_eval($css_rule['rule_conditions']);
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}
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else {
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$page_match = FALSE;
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}
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}
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}
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else {
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$page_match = TRUE;
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}
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return $page_match;
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}
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/**
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* Return the URI for a crid.
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* @param $crid
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* The integer identifying the CSS Rule ID (crid)
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*/
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function _css_injector_rule_uri($crid) {
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if (!empty($crid)) {
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$uri = 'public://css_injector/css_injector_' . $crid . '.css';
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return $uri;
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}
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}
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