29 lines
938 B
Rust
29 lines
938 B
Rust
type Delim<'a> = (&'a str, &'a str);
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/// Slice a string between a pair of delimiters.
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pub trait Between<'a> {
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/// Extract a string between the delimiters. If the delimiters were not
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/// found None is returned, otherwise the first extraction is returned.
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fn between(&self, delim: Delim<'_>) -> Option<&'a str>;
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/// Extract a string between the delimiters. If the delimiters were not
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/// found the original string is returned; take note of this behavior,
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/// if an empty slice is desired for this case use the fallible version and
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/// unwrap to EMPTY.
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fn between_infallible(&self, delim: Delim<'_>) -> &'a str;
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}
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impl<'a> Between<'a> for &'a str {
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#[inline]
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fn between_infallible(&self, delim: Delim<'_>) -> &'a str {
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self.between(delim).unwrap_or(self)
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}
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#[inline]
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fn between(&self, delim: Delim<'_>) -> Option<&'a str> {
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self.split_once(delim.0)
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.and_then(|(_, b)| b.rsplit_once(delim.1))
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.map(|(a, _)| a)
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}
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}
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