supercode-frontend-tui 0.5.84

//! Safe, bounded projections of runtime-owned values for human terminals.

/// Remove terminal control protocols and non-printing control characters.
pub(crate) fn sanitize_terminal_text(input: &str) -> String {
    #[derive(Clone, Copy)]
    enum State {
        Text,
        Escape,
        Csi,
        Osc,
        OscEscape,
    }

    let mut state = State::Text;
    let mut out = String::with_capacity(input.len());
    for ch in input.chars() {
        state = match state {
            State::Text if ch == '\u{1b}' => State::Escape,
            State::Text => {
                if ch == '\n' || ch == '\t' || !ch.is_control() {
                    out.push(ch);
                }
                State::Text
            }
            State::Escape if ch == '[' => State::Csi,
            State::Escape if ch == ']' => State::Osc,
            State::Escape => State::Text,
            State::Csi if ('@'..='~').contains(&ch) => State::Text,
            State::Csi => State::Csi,
            State::Osc if ch == '\u{7}' => State::Text,
            State::Osc if ch == '\u{1b}' => State::OscEscape,
            State::Osc => State::Osc,
            State::OscEscape if ch == '\\' => State::Text,
            State::OscEscape if ch == '\u{1b}' => State::OscEscape,
            State::OscEscape => State::Osc,
        };
    }
    out
}

/// Sanitize and cap display text by Unicode scalar count.
pub(crate) fn bounded_terminal_text(input: &str, limit: usize) -> String {
    let sanitized = sanitize_terminal_text(input);
    if sanitized.chars().count() <= limit {
        return sanitized;
    }
    let mut preview = sanitized
        .chars()
        .take(limit.saturating_sub(1))
        .collect::<String>();
    preview.push('…');
    preview
}

/// Sanitize protocol-owned labels and collapse line-breaking whitespace so a
/// name cannot escape the header/list row that owns it.
pub(crate) fn bounded_terminal_metadata(input: &str, limit: usize) -> String {
    let flattened = sanitize_terminal_text(input)
        .chars()
        .map(|character| match character {
            '\n' | '\t' => ' ',
            character => character,
        })
        .collect::<String>();
    bounded_terminal_text(&flattened, limit)
}