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detect_base_direction

gpuikit::input

Function detect_base_direction 

Source 
pub fn detect_base_direction(text: &str) -> TextDirection
Expand description

Detects the base direction of text using the first strong directional character.

This follows the Unicode Bidirectional Algorithm (UBA) rule P2/P3:

  • Find the first character with a strong directional type (L, R, or AL)
  • If it’s L, the paragraph direction is LTR
  • If it’s R or AL, the paragraph direction is RTL
  • If no strong character is found, defaults to LTR

§Examples

use gpuikit::input::detect_base_direction;

// English text is LTR
assert!(detect_base_direction("Hello world").is_ltr());

// Arabic text is RTL
assert!(detect_base_direction("مرحبا").is_rtl());

// Hebrew text is RTL
assert!(detect_base_direction("שלום").is_rtl());

// Mixed text uses first strong character
assert!(detect_base_direction("Hello مرحبا").is_ltr());
assert!(detect_base_direction("مرحبا Hello").is_rtl());

// Empty or neutral-only text defaults to LTR
assert!(detect_base_direction("").is_ltr());
assert!(detect_base_direction("123").is_ltr());