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ascii_width

ftui_text::wrap

Function ascii_width 

Source 
pub fn ascii_width(text: &str) -> Option<usize>
Expand description

Returns Some(width) if text is printable ASCII only, None otherwise.

This is a fast-path optimization. For printable ASCII (0x20-0x7E), display width equals byte length, so we can avoid the full Unicode width calculation.

Returns None for:

  • Non-ASCII characters (multi-byte UTF-8)
  • ASCII control characters (0x00-0x1F, 0x7F) which have display width 0

§Example

use ftui_text::wrap::ascii_width;

assert_eq!(ascii_width("hello"), Some(5));
assert_eq!(ascii_width("你好"), None);  // Contains CJK
assert_eq!(ascii_width(""), Some(0));
assert_eq!(ascii_width("hello\tworld"), None);  // Contains tab (control char)