formidable / classes / helpers / FrmCssScopeHelper.php

FrmCssScopeHelper.php in Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More 6.26.1, at classes/helpers/FrmCssScopeHelper.php

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1	<?php
2	if ( ! defined( 'ABSPATH' ) ) {
3	die( 'You are not allowed to call this page directly.' );
4	}
5
6	class FrmCssScopeHelper {
7
8	/**
9	* Nest the CSS.
10	* This function nests the CSS by adding the class name prefix to the selectors.
11	*
12	* @param string $css
13	* @param string $class_name
14	*
15	* @return string
16	*/
17	public function nest( $css, $class_name ) {
18	// Remove CSS comments but preserve newlines
19	$css = preg_replace( '/\/\.?\*\//s', '', $css );
20
21	$output = array();
22	$css = trim( $css );
23	$length = strlen( $css );
24	$i = 0;
25	$buffer = '';
26
27	while ( $i < $length ) {
28	$char = $css[ $i ];
29
30	if ( '@' === $char ) {
31	$brace_pos = strpos( $css, '{', $i );
32
33	if ( false === $brace_pos ) {
34	$buffer .= $char;
35	++$i;
36	continue;
37	}
38
39	$rule = substr( $css, $i, $brace_pos - $i );
40	$closing_brace = $this->find_matching_brace( $css, $brace_pos );
41	$inner_content = substr( $css, $brace_pos + 1, $closing_brace - $brace_pos - 1 );
42
43	// Don't nest keyframes content
44	if ( strpos( $rule, '@keyframes' ) !== false ) {
45	$output[] = "\n" . $rule . ' {' . $inner_content . '}' . "\n";
46	} else {
47	$output[] = "\n" . $rule . ' {';
48	$output[] = $this->nest( $inner_content, $class_name );
49	$output[] = '}' . "\n";
50	}
51
52	$i = $closing_brace + 1;
53	$buffer = '';
54	continue;
55	}//end if
56
57	if ( '{' === $char ) {
58	$selector = trim( $buffer );
59	$closing_brace = $this->find_matching_brace( $css, $i );
60	$declarations = substr( $css, $i + 1, $closing_brace - $i - 1 );
61
62	// Preserve indentation and formatting of declarations
63	$declarations = $this->preserve_declaration_formatting( $declarations );
64
65	if ( '' !== $selector && '' !== trim( $declarations ) ) {
66	// Handle multiple selectors
67	$selectors = array_map( 'trim', explode( ',', $selector ) );
68	$prefixed_selectors = array();
69
70	foreach ( $selectors as $single_selector ) {
71	if ( '' !== $single_selector ) {
72	$prefixed_selectors[] = '.' . $class_name . ' ' . $single_selector;
73	}
74	}
75
76	if ( ! empty( $prefixed_selectors ) ) {
77	$output[] = "\n" . implode( ',' . "\n", $prefixed_selectors ) . ' {' . $declarations . '}' . "\n";
78	}
79	}
80
81	$i = $closing_brace + 1;
82	$buffer = '';
83	continue;
84	}//end if
85
86	$buffer .= $char;
87	++$i;
88	}//end while
89
90	return implode( '', $output );
91	}
92
93	/**
94	* Unnest the CSS.
95	* This function unnests the CSS by removing the class name prefix from the selectors.
96	*
97	* @param string $css
98	* @param string $class_name
99	*
100	* @return string
101	*/
102	public function unnest( $css, $class_name ) {
103	// Remove CSS comments but preserve newlines
104	$css = preg_replace( '/\/\.?\*\//s', '', $css );
105
106	$output = array();
107	$css = trim( $css );
108	$length = strlen( $css );
109	$i = 0;
110	$buffer = '';
111	$prefix = '.' . $class_name . ' ';
112	$prefix_length = strlen( $prefix );
113
114	while ( $i < $length ) {
115	$char = $css[ $i ];
116
117	if ( '@' === $char ) {
118	$brace_pos = strpos( $css, '{', $i );
119
120	if ( false === $brace_pos ) {
121	$buffer .= $char;
122	++$i;
123
124	continue;
125	}
126
127	$rule = substr( $css, $i, $brace_pos - $i );
128	$closing_brace = $this->find_matching_brace( $css, $brace_pos );
129	$inner_content = substr( $css, $brace_pos + 1, $closing_brace - $brace_pos - 1 );
130
131	$output[] = "\n" . $rule . ' {';
132	$output[] = $this->unnest( $inner_content, $class_name );
133	$output[] = '}' . "\n";
134
135	$i = $closing_brace + 1;
136	$buffer = '';
137	continue;
138	}//end if
139
140	if ( '{' === $char ) {
141	$selector = trim( $buffer );
142	$closing_brace = $this->find_matching_brace( $css, $i );
143	$declarations = substr( $css, $i + 1, $closing_brace - $i - 1 );
144
145	// Preserve indentation and formatting of declarations
146	$declarations = $this->preserve_declaration_formatting( $declarations );
147
148	if ( '' !== $selector && '' !== trim( $declarations ) ) {
149	// Handle multiple selectors
150	$selectors = array_filter(
151	array_map( 'trim', explode( ',', $selector ) ),
152	function ( $s ) {
153	return '' !== $s;
154	}
155	);
156	$unprefixed_selectors = array();
157
158	foreach ( $selectors as $single_selector ) {
159	$unprefixed_selectors[] = 0 === strpos( $single_selector, $prefix )
160	? trim( substr( $single_selector, $prefix_length ) )
161	: $single_selector;
162	}
163
164	if ( ! empty( $unprefixed_selectors ) ) {
165	$output[] = "\n" . implode( ',' . "\n", $unprefixed_selectors ) . ' {' . $declarations . '}' . "\n";
166	}
167	}
168
169	$i = $closing_brace + 1;
170	$buffer = '';
171	continue;
172	}//end if
173
174	$buffer .= $char;
175	++$i;
176	}//end while
177	return implode( '', $output );
178	}
179
180	/**
181	* Preserve declaration formatting with proper indentation.
182	*
183	* @param string $declarations
184	*
185	* @return string
186	*/
187	private function preserve_declaration_formatting( $declarations ) {
188	// Trim the entire block but keep internal structure
189	$declarations = trim( $declarations );
190
191	if ( '' === $declarations ) {
192	return '';
193	}
194
195	// Check if declarations are already on multiple lines
196	if ( strpos( $declarations, "\n" ) !== false ) {
197	// Already formatted - preserve it
198	$lines = explode( "\n", $declarations );
199	$formatted_lines = array();
200
201	foreach ( $lines as $line ) {
202	$trimmed = trim( $line );
203
204	if ( '' !== $trimmed ) {
205	$formatted_lines[] = "\n\t" . $trimmed;
206	}
207	}
208
209	return implode( '', $formatted_lines ) . "\n";
210	}
211
212	// Single line - add minimal formatting
213	return ' ' . $declarations . ' ';
214	}
215
216	/**
217	* Find the matching brace in the CSS.
218	*
219	* @param string $css
220	* @param int $open_pos
221	*
222	* @return int
223	*/
224	private function find_matching_brace( $css, $open_pos ) {
225	$level = 1;
226	$length = strlen( $css );
227	$in_string = false;
228	$string_char = '';
229
230	for ( $i = $open_pos + 1; $i < $length; $i++ ) {
231	$char = $css[ $i ];
232
233	// Handle string literals to avoid matching braces inside strings
234	if ( ( '"' === $char \|\| "'" === $char ) && ( 0 === $i \|\| '\\' !== $css[ $i - 1 ] ) ) {
235	if ( ! $in_string ) {
236	$in_string = true;
237	$string_char = $char;
238	} elseif ( $char === $string_char ) {
239	$in_string = false;
240	}
241	continue;
242	}
243
244	// Skip braces inside strings
245	if ( $in_string ) {
246	continue;
247	}
248
249	if ( '{' === $char ) {
250	++$level;
251	} elseif ( '}' === $char ) {
252	--$level;
253
254	if ( 0 === $level ) {
255	return $i;
256	}
257	}
258	}//end for
259
260	return $length - 1;
261	}
262	}//end class
263