parse/
name_case.rs

1
2enum CamelCaseState {
3	Start,
4	Lower,
5	Upper,
6	UpperUpper,
7	Digit,
8}
9
10pub fn camel_case_to_title_case(camel_case: &str) -> String {
11	use CamelCaseState::*;
12
13	let mut answer = String::with_capacity(camel_case.len());
14	let mut state = Start;
15
16	for c in camel_case.chars() {
17		if c.is_ascii_digit() {
18			match state {
19				Start | Digit => {
20					answer.push(c);
21					state = Digit;
22				}
23				Lower | Upper | UpperUpper => {
24					answer.push(' ');
25					answer.push(c);
26					state = Digit;
27				}
28			}
29		} else if c.is_ascii_uppercase() {
30			match state {
31				Start => {
32					answer.push(c);
33					state = Upper;
34				}
35				Upper | UpperUpper => {
36					answer.push(c);
37					state = UpperUpper;
38				}
39				Lower | Digit => {
40					answer.push(' ');
41					answer.push(c);
42					state = Upper;
43				}
44			}
45		} else {
46			match state {
47				Start => {
48					answer.push(c.to_ascii_uppercase());
49					state = Lower;
50				}
51				Lower | Upper => {
52					answer.push(c);
53					state = Lower;
54				}
55				UpperUpper => {
56					if let Some(capital) = answer.pop() {
57						answer.push(' ');
58						answer.push(capital);
59					}
60					answer.push(c);
61					state = Lower;
62				}
63				Digit => {
64					answer.push(' ');
65					answer.push(c.to_ascii_uppercase());
66					state = Upper;
67				}
68			}
69		}
70	}
71
72	answer
73}
parse/name_case.rs

parse/
name_case.rs
