string-view 0.2.0

String View

Work with views into string slices. Safely extend, reduce without losing parent string size.

Use in-place modifications to speed up your code.

Example:

let program_text = r#"
fn main() {
    let text = "Hello World";
}
"#;

use string_view::StrExt;

let mut view = program_text.view_part(0, 0);
view.extend_while(|ch| ch == ' ' || ch == '\n');
view.extend_while(char::is_alphabetic);
view.reduce_left_while(|ch| ch == ' ' || ch == '\n');
assert_eq!(view.as_str(), "fn");

view.try_extend(1).unwrap();
view.extend_while(char::is_alphabetic);
view.try_extend(2).unwrap();
assert_eq!(view.as_str(), "fn main()");

view.extend_while(|ch| ch == ' ' || ch == '\n' || ch == '{');
view.shrink_to_end();
view.extend_while(|_| true);
view.reduce_while(|ch| ch == ' ' || ch == '\n' || ch == '}');
assert_eq!(view.as_str(), r#"let text = "Hello World";"#);

view.reduce_while(|ch| ch == ';');
view.reduce(1);
view.shrink_to_end();
view.extend_left_while(|ch| ch != '"');
assert_eq!(view.as_str(), "Hello World");