Function visual_len 

pub fn visual_len(text: &str) -> usize

Calculate the visible character count (char-based, Tier 1).

Counts characters that would be visible in terminal output, ignoring ANSI escape sequences.

Arguments

• text - Input text potentially containing ANSI escape sequences

Returns

Number of visible characters (Unicode codepoints, not graphemes).

Examples

use strs_tools::ansi::visual_len;

assert_eq!( visual_len( "hello" ), 5 );
assert_eq!( visual_len( "\x1b[31mred\x1b[0m" ), 3 );
assert_eq!( visual_len( "\x1b[1;31mbold red\x1b[0m" ), 8 );

Performance

• Time complexity: O(n)
• Benchmark: ~100ns/KB on modern hardware