2019-12-29 05:00:20 -05:00
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use phf::Map;
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2019-12-29 05:53:49 -05:00
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2019-12-26 00:17:57 -05:00
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pub struct SinglePattern {
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2020-01-01 22:14:40 -05:00
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pub seq: &'static [u8],
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pub table: &'static [usize],
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2019-12-26 00:17:57 -05:00
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}
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impl SinglePattern {
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pub fn match_against(&self, haystack: &[u8]) -> Option<usize> {
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let mut hay_idx = 0usize;
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let mut pat_idx = 0usize;
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while hay_idx < haystack.len() {
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if self.seq[pat_idx] == haystack[hay_idx] {
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pat_idx += 1;
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hay_idx += 1;
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};
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if pat_idx == self.seq.len() {
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return Some(hay_idx - pat_idx);
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};
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if hay_idx < haystack.len() && self.seq[pat_idx] != haystack[hay_idx] {
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if pat_idx != 0 {
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pat_idx = self.table[pat_idx - 1];
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} else {
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hay_idx += 1;
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};
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};
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};
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None
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}
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}
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2019-12-29 05:00:20 -05:00
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pub struct TrieNode<V: 'static + Copy> {
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pub children: Map<u8, &'static TrieNode<V>>,
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pub value: Option<V>,
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}
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