fn evaluate_expression(first: &str, operator: &str, second: &str, stderr: &mut io::Stderr) -> i32 {
    match operator {
        "=" | "==" => evaluate_bool(first == second),
        "!="       => evaluate_bool(first != second),
        "-ef"      => files_have_same_device_and_inode_numbers(first, second),
        "-nt"      => file_is_newer_than(first, second),
        "-ot"      => file_is_newer_than(second, first),
        _          => {
            let (left, right) = parse_integers(first, second, stderr);
            match operator {
                "-eq" => evaluate_bool(left == right),
                "-ge" => evaluate_bool(left >= right),
                "-gt" => evaluate_bool(left > right),
                "-le" => evaluate_bool(left <= right),
                "-lt" => evaluate_bool(left < right),
                "-ne" => evaluate_bool(left != right),
                _     => {
                    stderr.write_all(b"unknown condition: ").try(stderr);
                    stderr.write_all(operator.as_bytes()).try(stderr);
                    stderr.write_all(&[b'\n']).try(stderr);
                    stderr.flush().try(stderr);
                    FAILED
                }
            }
        }
    }

}
/// Evaluate an expression of `VALUE -OPERATOR VALUE`.
Evaluate an expression of `VALUE -OPERATOR VALUE`.
Evaluate an expression of ` VALUE - OPERATOR VALUE ` .
fn evaluate_expression(first: &str, operator: &str, second: &str, stderr: &mut io::Stderr) -> i32 {
    match operator {
        "=" | "==" => evaluate_bool(first == second),
        "!="       => evaluate_bool(first != second),
        "-ef"      => files_have_same_device_and_inode_numbers(first, second),
        "-nt"      => file_is_newer_than(first, second),
        "-ot"      => file_is_newer_than(second, first),
        _          => {
            let (left, right) = parse_integers(first, second, stderr);
            match operator {
                "-eq" => evaluate_bool(left == right),
                "-ge" => evaluate_bool(left >= right),
                "-gt" => evaluate_bool(left > right),
                "-le" => evaluate_bool(left <= right),
                "-lt" => evaluate_bool(left < right),
                "-ne" => evaluate_bool(left != right),
                _     => {
                    stderr.write_all(b"unknown condition: ").try(stderr);
                    stderr.write_all(operator.as_bytes()).try(stderr);
                    stderr.write_all(&[b'\n']).try(stderr);
                    stderr.flush().try(stderr);
                    FAILED
                }
            }
        }
    }
}
fn evaluate_expression ( first : & str , operator : & str , second : & str , stderr : & mut io :: Stderr ) -> i32 { match operator { " " | " " => evaluate_bool ( first == second ) , " " => evaluate_bool ( first != second ) , " " => files_have_same_device_and_inode_numbers ( first , second ) , " " => file_is_newer_than ( first , second ) , " " => file_is_newer_than ( second , first ) , _ => { let ( left , right ) = parse_integers ( first , second , stderr ) ; match operator { " " => evaluate_bool ( left == right ) , " " => evaluate_bool ( left >= right ) , " " => evaluate_bool ( left > right ) , " " => evaluate_bool ( left <= right ) , " " => evaluate_bool ( left < right ) , " " => evaluate_bool ( left != right ) , _ => { stderr . write_all ( b" " ) . try ( stderr ) ; stderr . write_all ( operator . as_bytes ( ) ) . try ( stderr ) ; stderr . write_all ( & [ b'\n' ] ) . try ( stderr ) ; stderr . flush ( ) . try ( stderr ) ; FAILED } } } } }
Evaluate an expression of `VALUE -OPERATOR VALUE`.
Evaluate an expression of ` VALUE - OPERATOR VALUE ` .
first
&str
operator
&str
second
&str
stderr
&mut io::Stderr