polylang / src / frontend / frontend-filters-search.php

frontend-filters-search.php in Polylang trunk, at src/frontend/frontend-filters-search.php

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1	<?php
2	/**
3	* @package Polylang
4	*/
5
6	/**
7	* Filters search forms when using permalinks
8	*
9	* @since 1.2
10	*/
11	class PLL_Frontend_Filters_Search {
12	/**
13	* Instance of a child class of PLL_Links_Model.
14	*
15	* @var PLL_Links_Model
16	*/
17	public $links_model;
18
19	/**
20	* Current language.
21	*
22	* @var PLL_Language\|null
23	*/
24	public $curlang;
25
26	/**
27	* Constructor.
28	*
29	* @since 1.2
30	*
31	* @param object $polylang The Polylang object.
32	*/
33	public function __construct( &$polylang ) {
34	$this->links_model = &$polylang->links_model;
35	$this->curlang = &$polylang->curlang;
36
37	// Adds the language information in the search form
38	// Low priority in case the search form is created using the same filter as described in http://codex.wordpress.org/Function_Reference/get_search_form
39	add_filter( 'get_search_form', array( $this, 'get_search_form' ), 99 );
40
41	// Adds the language information in the search block.
42	add_filter( 'render_block_core/search', array( $this, 'get_search_form' ) );
43
44	// Adds the language information in admin bar search form
45	add_action( 'add_admin_bar_menus', array( $this, 'add_admin_bar_menus' ) );
46
47
48	// Adds javascript at the end of the document
49	// Was used for WP < 3.6. kept just in case
50	if ( defined( 'PLL_SEARCH_FORM_JS' ) && PLL_SEARCH_FORM_JS ) {
51	add_action( 'wp_footer', array( $this, 'wp_print_footer_scripts' ) );
52	}
53	}
54
55	/**
56	* Adds the language information in the search form.
57	*
58	* Does not work if searchform.php ( prior to WP 3.6 ) is used or if the search form is hardcoded in another template file
59	*
60	* @since 0.1
61	*
62	* @param string $form The search form HTML.
63	* @return string Modified search form.
64	*/
65	public function get_search_form( $form ) {
66	if ( empty( $form ) \|\| empty( $this->curlang ) ) {
67	return $form;
68	}
69
70	if ( $this->links_model->using_permalinks ) {
71	// Take care to modify only the url in the <form> tag.
72	preg_match( '#<form.+?>#s', $form, $matches );
73	$old = reset( $matches );
74	if ( empty( $old ) ) {
75	return $form;
76	}
77	// Replace action attribute (a text with no space and no closing tag within double quotes or simple quotes or without quotes).
78	$new = preg_replace( '#\saction=("[^"\r\n]+"\|\'[^\'\r\n]+\'\|[^\'"][^>\s]+)#', ' action="' . esc_url( $this->curlang->get_search_url() ) . '"', $old );
79	if ( empty( $new ) ) {
80	return $form;
81	}
82	$form = str_replace( $old, $new, $form );
83	} else {
84	$form = str_replace( '</form>', '<input type="hidden" name="lang" value="' . esc_attr( $this->curlang->slug ) . '" /></form>', $form );
85	}
86
87	return $form;
88	}
89
90	/**
91	* Adds the language information in the admin bar search form.
92	*
93	* @since 1.2
94	*
95	* @return void
96	*/
97	public function add_admin_bar_menus() {
98	remove_action( 'admin_bar_menu', 'wp_admin_bar_search_menu', 9999 );
99	add_action( 'admin_bar_menu', array( $this, 'admin_bar_search_menu' ), 9999 );
100	}
101
102	/**
103	* Rewrites the admin bar search form to pass our get_search_form filter. See #21342.
104	* Code last checked: WP 5.4.1.
105	*
106	* @since 0.9
107	*
108	* @param WP_Admin_Bar $wp_admin_bar The WP_Admin_Bar instance, passed by reference.
109	* @return void
110	*/
111	public function admin_bar_search_menu( $wp_admin_bar ) {
112	$form = '<form action="' . esc_url( home_url( '/' ) ) . '" method="get" id="adminbarsearch">';
113	$form .= '<input class="adminbar-input" name="s" id="adminbar-search" type="text" value="" maxlength="150" />';
114	$form .= '<label for="adminbar-search" class="screen-reader-text">' .
115	/* translators: Hidden accessibility text. */
116	esc_html__( 'Search', 'polylang' ) .
117	'</label>';
118	$form .= '<input type="submit" class="adminbar-button" value="' . esc_attr__( 'Search', 'polylang' ) . '" />';
119	$form .= '</form>';
120
121	$wp_admin_bar->add_node(
122	array(
123	'parent' => 'top-secondary',
124	'id' => 'search',
125	'title' => $this->get_search_form( $form ), // Pass the get_search_form filter.
126	'meta' => array(
127	'class' => 'admin-bar-search',
128	'tabindex' => -1,
129	),
130	)
131	);
132	}
133
134	/**
135	* Allows modifying the search form if it does not pass get_search_form.
136	*
137	* @since 0.1
138	*
139	* @return void
140	*/
141	public function wp_print_footer_scripts() {
142	/*
143	* Don't use directly e[0] just in case there is somewhere else an element named 's'
144	* Check before if the hidden input has not already been introduced by get_search_form ( FIXME: is there a way to improve this ) ?
145	* Thanks to AndyDeGroo for improving the code for compatibility with old browsers
146	* http://wordpress.org/support/topic/development-of-polylang-version-08?replies=6#post-2645559
147	*/
148	$lang = esc_js( $this->curlang->slug );
149	$js = "e = document.getElementsByName( 's' );
150	for ( i = 0; i < e.length; i++ ) {
151	if ( e[i].tagName.toUpperCase() == 'INPUT' ) {
152	s = e[i].parentNode.parentNode.children;
153	l = 0;
154	for ( j = 0; j < s.length; j++ ) {
155	if ( s[j].name == 'lang' ) {
156	l = 1;
157	}
158	}
159	if ( l == 0 ) {
160	var ih = document.createElement( 'input' );
161	ih.type = 'hidden';
162	ih.name = 'lang';
163	ih.value = '{$lang}';
164	e[i].parentNode.appendChild( ih );
165	}
166	}
167	}";
168
169	$type_attr = current_theme_supports( 'html5', 'script' ) ? '' : ' type="text/javascript"';
170
171	if ( $type_attr ) {
172	$js = "/* <![CDATA[ /\n{$js}\n/ ]]> */";
173	}
174
175	echo "<script{$type_attr}>\n{$js}\n</script>\n"; // phpcs:ignore WordPress.Security.EscapeOutput
176	}
177	}
178