Function delete_content_range

src/text_input.rs:2494–2549

Delete content characters in `[content_start, content_end)` from the raw styled string, preserving all structural/tag characters.

(raw: &str, content_start: usize, content_end: usize)

    /// Delete content characters in `[content_start, content_end)` from the
    /// raw styled string, preserving all structural/tag characters.
    pub fn delete_content_range(raw: &str, content_start: usize, content_end: usize) -> String {
        if content_start >= content_end {
            return raw.to_string();
        }

        let chars: Vec<char> = raw.chars().collect();
        let len = chars.len();
        let mut result = String::with_capacity(raw.len());
        let mut content = 0usize;
        let mut i = 0;
        let mut in_style_def = false;

        while i < len {
            let c = chars[i];

            match c {
                '\\' if !in_style_def && i + 1 < len => {
                    let in_range = content >= content_start && content < content_end;
                    if !in_range {
                        result.push(c);
                        result.push(chars[i + 1]);
                    }
                    content += 1;
                    i += 2;
                }
                '{' if !in_style_def => {
                    in_style_def = true;
                    result.push(c);
                    i += 1;
                }
                '|' if in_style_def => {
                    in_style_def = false;
                    result.push(c);
                    i += 1;
                }
                '}' if !in_style_def => {
                    result.push(c);
                    i += 1;
                }
                _ if in_style_def => {
                    result.push(c);
                    i += 1;
                }
                _ => {
                    let in_range = content >= content_start && content < content_end;
                    if !in_range {
                        result.push(c);
                    }
                    content += 1;
                    i += 1;
                }
            }
        }

        result
    }

    /// Find word boundary left in visual space.