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235 lines
| 1 | <?php |
| 2 | /** |
| 3 | * Fluid Typography module for FrontBlocks. |
| 4 | * |
| 5 | * @package FrontBlocks |
| 6 | * @author David Perez <david@close.technology> |
| 7 | * @copyright 2025 Closemarketing |
| 8 | * @version 1.0 |
| 9 | */ |
| 10 | |
| 11 | namespace FrontBlocks\Frontend; |
| 12 | |
| 13 | defined( 'ABSPATH' ) || exit; |
| 14 | |
| 15 | /** |
| 16 | * FluidTypography class. |
| 17 | * |
| 18 | * @since 1.0.0 |
| 19 | */ |
| 20 | class FluidTypography { |
| 21 | |
| 22 | /** |
| 23 | * Constructor. |
| 24 | */ |
| 25 | public function __construct() { |
| 26 | // Check if module is enabled. |
| 27 | if ( ! $this->is_enabled() ) { |
| 28 | return; |
| 29 | } |
| 30 | |
| 31 | $this->init_hooks(); |
| 32 | } |
| 33 | |
| 34 | /** |
| 35 | * Check if module is enabled. |
| 36 | * |
| 37 | * @return bool |
| 38 | */ |
| 39 | private function is_enabled() { |
| 40 | $options = get_option( 'frontblocks_settings', array() ); |
| 41 | return ! empty( $options['enable_fluid_typography'] ); |
| 42 | } |
| 43 | |
| 44 | /** |
| 45 | * Initialize hooks. |
| 46 | * |
| 47 | * @return void |
| 48 | */ |
| 49 | private function init_hooks() { |
| 50 | add_action( 'wp_enqueue_scripts', array( $this, 'enqueue_fluid_typography' ), 999 ); |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Enqueue fluid typography styles. |
| 55 | * |
| 56 | * @return void |
| 57 | */ |
| 58 | public function enqueue_fluid_typography() { |
| 59 | // Get GeneratePress dynamic CSS output. |
| 60 | $dynamic_css = get_option( 'generate_dynamic_css_output', '' ); |
| 61 | |
| 62 | if ( empty( $dynamic_css ) ) { |
| 63 | return; |
| 64 | } |
| 65 | |
| 66 | // Generate fluid typography CSS from dynamic CSS. |
| 67 | $fluid_css = $this->convert_to_fluid_typography( $dynamic_css ); |
| 68 | |
| 69 | // DEBUG: Show generated CSS as HTML comment for admins. |
| 70 | if ( current_user_can( 'manage_options' ) && isset( $_GET['frbl_debug'] ) ) { // phpcs:ignore WordPress.Security.NonceVerification.Recommended |
| 71 | add_action( |
| 72 | 'wp_head', |
| 73 | function () use ( $fluid_css ) { |
| 74 | echo "\n<!-- FRBL Fluid Typography DEBUG:\n" . esc_html( $fluid_css ) . "\n-->\n"; |
| 75 | } |
| 76 | ); |
| 77 | } |
| 78 | |
| 79 | if ( ! empty( $fluid_css ) ) { |
| 80 | wp_add_inline_style( 'generate-style', $fluid_css ); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * Convert GeneratePress static CSS to fluid typography. |
| 86 | * |
| 87 | * @param string $css Dynamic CSS from GeneratePress. |
| 88 | * @return string Fluid typography CSS. |
| 89 | */ |
| 90 | private function convert_to_fluid_typography( $css ) { |
| 91 | $fluid_css = ''; |
| 92 | |
| 93 | // Typography selectors to process - starting with simple ones that definitely work. |
| 94 | $selectors = array( |
| 95 | 'body', // Body text (paragraphs inherit from this). |
| 96 | 'h1', // Heading 1. |
| 97 | 'h2', // Heading 2. |
| 98 | 'h3', // Heading 3. |
| 99 | 'h4', // Heading 4. |
| 100 | 'h5', // Heading 5. |
| 101 | 'h6', // Heading 6. |
| 102 | ); |
| 103 | |
| 104 | foreach ( $selectors as $selector ) { |
| 105 | $fluid_rule = $this->extract_and_convert_selector( $css, $selector ); |
| 106 | |
| 107 | if ( ! empty( $fluid_rule ) ) { |
| 108 | $fluid_css .= $fluid_rule . "\n"; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | return $fluid_css; |
| 113 | } |
| 114 | |
| 115 | /** |
| 116 | * Extract font sizes from CSS and convert to fluid typography. |
| 117 | * |
| 118 | * @param string $css CSS content. |
| 119 | * @param string $selector CSS selector (e.g., 'h1'). |
| 120 | * @return string Fluid CSS rule or empty string. |
| 121 | */ |
| 122 | private function extract_and_convert_selector( $css, $selector ) { |
| 123 | $sizes = array( |
| 124 | 'desktop' => null, |
| 125 | 'tablet' => null, |
| 126 | 'mobile' => null, |
| 127 | ); |
| 128 | |
| 129 | // Use different regex patterns depending on the selector. |
| 130 | // Body is in a multiple selector (body, button, input...), headings are standalone. |
| 131 | $is_multiple_selector = ( 'body' === $selector ); |
| 132 | |
| 133 | // Extract base/desktop font-size. |
| 134 | if ( $is_multiple_selector ) { |
| 135 | $pattern = '/(?:^|,|\})\s*[^{]*\b' . preg_quote( $selector, '/' ) . '\b[^{]*\{[^}]*font-size:\s*([0-9.]+)(px|rem|em)/i'; |
| 136 | } else { |
| 137 | $pattern = '/' . preg_quote( $selector, '/' ) . '\s*\{[^}]*font-size:\s*([0-9.]+)(px|rem|em)/i'; |
| 138 | } |
| 139 | |
| 140 | if ( preg_match( $pattern, $css, $matches ) ) { |
| 141 | $sizes['desktop'] = array( |
| 142 | 'value' => floatval( $matches[1] ), |
| 143 | 'unit' => $matches[2], |
| 144 | ); |
| 145 | } |
| 146 | |
| 147 | // Extract tablet font-size from @media (max-width: 1024px). |
| 148 | if ( $is_multiple_selector ) { |
| 149 | // Pattern for body in media query. |
| 150 | $pattern_tablet = '/@media[^{]*max-width:\s*1024px[^{]*\{[^@]*\b' . preg_quote( $selector, '/' ) . '\b[^{]*\{[^}]*font-size:\s*([0-9.]+)(px|rem|em)/is'; |
| 151 | } else { |
| 152 | $pattern_tablet = '/@media[^{]*max-width:\s*1024px[^{]*\{[^}]*' . preg_quote( $selector, '/' ) . '\s*\{[^}]*font-size:\s*([0-9.]+)(px|rem|em)/is'; |
| 153 | } |
| 154 | |
| 155 | if ( preg_match( $pattern_tablet, $css, $matches ) ) { |
| 156 | $sizes['tablet'] = array( |
| 157 | 'value' => floatval( $matches[1] ), |
| 158 | 'unit' => $matches[2], |
| 159 | ); |
| 160 | } |
| 161 | |
| 162 | // Extract mobile font-size from @media (max-width: 768px). |
| 163 | if ( $is_multiple_selector ) { |
| 164 | // Pattern for body in media query. |
| 165 | $pattern_mobile = '/@media[^{]*max-width:\s*768px[^{]*\{[^@]*\b' . preg_quote( $selector, '/' ) . '\b[^{]*\{[^}]*font-size:\s*([0-9.]+)(px|rem|em)/is'; |
| 166 | } else { |
| 167 | $pattern_mobile = '/@media[^{]*max-width:\s*768px[^{]*\{[^}]*' . preg_quote( $selector, '/' ) . '\s*\{[^}]*font-size:\s*([0-9.]+)(px|rem|em)/is'; |
| 168 | } |
| 169 | |
| 170 | if ( preg_match( $pattern_mobile, $css, $matches ) ) { |
| 171 | $sizes['mobile'] = array( |
| 172 | 'value' => floatval( $matches[1] ), |
| 173 | 'unit' => $matches[2], |
| 174 | ); |
| 175 | } |
| 176 | |
| 177 | // If we don't have enough data, skip. |
| 178 | if ( ! $sizes['desktop'] || ! $sizes['mobile'] ) { |
| 179 | return ''; |
| 180 | } |
| 181 | |
| 182 | // Ensure all units are the same. |
| 183 | if ( $sizes['desktop']['unit'] !== $sizes['mobile']['unit'] ) { |
| 184 | return ''; |
| 185 | } |
| 186 | |
| 187 | $min_size = $sizes['mobile']['value']; |
| 188 | $max_size = $sizes['desktop']['value']; |
| 189 | $unit = $sizes['desktop']['unit']; |
| 190 | |
| 191 | // Skip if same values. |
| 192 | if ( $min_size === $max_size ) { |
| 193 | return ''; |
| 194 | } |
| 195 | |
| 196 | // Generate fluid typography with clamp(). |
| 197 | // Viewport range: 320px (mobile) to 1440px (desktop). |
| 198 | $viewport_start = 320; |
| 199 | $viewport_end = 1440; |
| 200 | $viewport_diff = $viewport_end - $viewport_start; |
| 201 | |
| 202 | // Build clamp() formula. |
| 203 | $fluid_calc = sprintf( |
| 204 | 'calc(%1$s%2$s + (%3$s - %1$s) * ((100vw - %4$spx) / %5$s))', |
| 205 | $min_size, |
| 206 | $unit, |
| 207 | $max_size, |
| 208 | $viewport_start, |
| 209 | $viewport_diff |
| 210 | ); |
| 211 | |
| 212 | $clamp_rule = sprintf( |
| 213 | 'clamp(%1$s%2$s, %3$s, %4$s%2$s)', |
| 214 | $min_size, |
| 215 | $unit, |
| 216 | $fluid_calc, |
| 217 | $max_size |
| 218 | ); |
| 219 | |
| 220 | // Generate CSS rule with appropriate specificity. |
| 221 | if ( in_array( $selector, array( 'h1', 'h2', 'h3', 'h4', 'h5', 'h6' ), true ) ) { |
| 222 | // For headings, use high specificity to ensure they always win over body classes. |
| 223 | $rule = sprintf( "body %s,\nbody %s.gb-headline {\n\tfont-size: %s !important;\n}", $selector, $selector, $clamp_rule ); |
| 224 | } else { |
| 225 | // For body, apply to body and paragraphs with GB classes. |
| 226 | $rule = sprintf( "%s {\n\tfont-size: %s !important;\n}", $selector, $clamp_rule ); |
| 227 | if ( 'body' === $selector ) { |
| 228 | $rule .= sprintf( "\np.gb-headline-text {\n\tfont-size: %s !important;\n}", $clamp_rule ); |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | return $rule; |
| 233 | } |
| 234 | } |
| 235 |