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Enclose a string written by a closure in opening and closing chars, or a specified number of parentheses.
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| /// Encloses the string written by `enclosed` in the opening an closing | |
| /// characters provided. | |
| fn enclose<F>(s: &mut String, open: char, close: char, enclosed: F) | |
| where | |
| F: FnOnce(&mut String), | |
| { | |
| s.push(open); | |
| enclosed(s); | |
| s.push(close); | |
| } | |
| /// The string written by the `enclosed` function will be enclosed in | |
| /// `parens_count` pairs of parentheses. A count of `0` is allowed. | |
| fn parenthesize<F>(s: &mut String, parens_count: usize, enclosed: F) | |
| where | |
| F: FnOnce(&mut String), | |
| { | |
| match parens_count { | |
| 0 => { | |
| enclosed(s); | |
| return; | |
| } | |
| 1 => { | |
| enclose(s, '(', ')', enclosed); | |
| return; | |
| } | |
| _ => {} | |
| } | |
| let mut enclosed: Box<dyn FnOnce(&mut String)> = Box::new(enclosed); | |
| for _ in 0..parens_count { | |
| enclosed = Box::new(|s| enclose(s, '(', ')', enclosed)); | |
| } | |
| enclosed(s); | |
| } |
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