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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | namespace Wikimedia\Leximorph\Handler; |
| 8 | |
| 9 | use Wikimedia\Leximorph\Provider; |
| 10 | |
| 11 | /** |
| 12 | * Bidi |
| 13 | * |
| 14 | * The Bidi class applies bidirectional formatting to text by wrapping the input |
| 15 | * with directional isolation control characters. It detects the primary directionality |
| 16 | * (left-to-right or right-to-left) of the text and ensures that mixed-direction content |
| 17 | * is rendered correctly. |
| 18 | * |
| 19 | * Usage Example: |
| 20 | * <code> |
| 21 | * echo $bidi->process( 'Hello World' ); |
| 22 | * </code> |
| 23 | * |
| 24 | * @since 1.45 |
| 25 | * @author Doğu Abaris (abaris@null.net) |
| 26 | * @license https://www.gnu.org/copyleft/gpl.html GPL-2.0-or-later |
| 27 | */ |
| 28 | class Bidi { |
| 29 | |
| 30 | /** |
| 31 | * Unicode LEFT-TO-RIGHT EMBEDDING character (U+202A). |
| 32 | */ |
| 33 | public const LRE = "\xE2\x80\xAA"; |
| 34 | |
| 35 | /** |
| 36 | * Unicode RIGHT-TO-LEFT EMBEDDING character (U+202B). |
| 37 | */ |
| 38 | public const RLE = "\xE2\x80\xAB"; |
| 39 | |
| 40 | /** |
| 41 | * Unicode POP DIRECTIONAL FORMATTING character (U+202C). |
| 42 | */ |
| 43 | public const PDF = "\xE2\x80\xAC"; |
| 44 | |
| 45 | /** |
| 46 | * Initializes the Bidi handler with the provider. |
| 47 | * |
| 48 | * @param Provider $provider The provider instance to use. |
| 49 | * |
| 50 | * @since 1.45 |
| 51 | */ |
| 52 | public function __construct( |
| 53 | private readonly Provider $provider, |
| 54 | ) { |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Applies bidirectional formatting to the provided text. |
| 59 | * |
| 60 | * This method determines the primary text direction (LTR or RTL) by |
| 61 | * examining the first strongly directional codepoint in the string. |
| 62 | * It then wraps the text with the appropriate directional control |
| 63 | * characters: LRE and PDF for left-to-right, RLE and PDF for right-to-left. |
| 64 | * If no strong directionality is detected, the text is returned |
| 65 | * unmodified. |
| 66 | * |
| 67 | * @param string $value The text to format. |
| 68 | * |
| 69 | * @since 1.45 |
| 70 | * @return string The text with directional controls, or the original text. |
| 71 | */ |
| 72 | public function process( string $value ): string { |
| 73 | $dir = $this->provider->getBidiProvider()->getDirection( $value ); |
| 74 | if ( $dir === 'ltr' ) { |
| 75 | # Wrap in LEFT-TO-RIGHT EMBEDDING ... POP DIRECTIONAL FORMATTING |
| 76 | return self::LRE . $value . self::PDF; |
| 77 | } |
| 78 | if ( $dir === 'rtl' ) { |
| 79 | # Wrap in RIGHT-TO-LEFT EMBEDDING ... POP DIRECTIONAL FORMATTING |
| 80 | return self::RLE . $value . self::PDF; |
| 81 | } |
| 82 | |
| 83 | # No strong directionality: return the text unmodified |
| 84 | return $value; |
| 85 | } |
| 86 | } |