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26 lines
545 B
Rust
26 lines
545 B
Rust
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#[must_use]
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pub(crate) fn camel_to_snake_string(s: &str) -> String {
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let mut output = String::with_capacity(
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s.chars()
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.fold(s.len(), |a, ch| a.saturating_add(usize::from(ch.is_ascii_uppercase()))),
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);
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let mut state = false;
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s.chars().for_each(|ch| {
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let m = ch.is_ascii_uppercase();
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let s = exchange(&mut state, !m);
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if m && s {
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output.push('_');
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}
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output.push(ch.to_ascii_lowercase());
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});
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output
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}
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pub(crate) fn exchange<T: Clone>(state: &mut T, source: T) -> T {
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let ret = state.clone();
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*state = source;
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ret
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}
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