Function remove_trailing_commas

src/agents/mod.rs:1089–1116

Removes trailing commas that appear immediately before `}` or `]` (with optional whitespace/newlines in between).

(input: &str)

/// Removes trailing commas that appear immediately before `}` or `]` (with
/// optional whitespace/newlines in between).
fn remove_trailing_commas(input: &str) -> String {
    // We scan for comma, optional whitespace, then `}` or `]`.
    let bytes = input.as_bytes();
    let len = bytes.len();
    let mut out = Vec::with_capacity(len);
    let mut i = 0;

    while i < len {
        if bytes[i] == b',' {
            // Peek ahead past whitespace.
            let mut j = i + 1;
            while j < len
                && (bytes[j] == b' ' || bytes[j] == b'\t' || bytes[j] == b'\n' || bytes[j] == b'\r')
            {
                j += 1;
            }
            if j < len && (bytes[j] == b'}' || bytes[j] == b']') {
                // Skip the comma; whitespace will be included normally.
                i += 1;
                continue;
            }
        }
        out.push(bytes[i]);
        i += 1;
    }

    String::from_utf8(out).unwrap_or_else(|_| input.to_string())
}

/// Read a file and parse it as JSONC. Falls back to `json!({})` if the file
/// is missing, unreadable, or unparseable.