82 lines
2.1 KiB
Rust
82 lines
2.1 KiB
Rust
use std::slice::Iter;
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use std::str::Chars;
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pub trait KeywordComparatorIterator<C: Copy> {
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fn consume(&mut self, c: C) -> bool;
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}
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pub trait Keyword<C: Copy> {
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fn startComparation<'keyword>(
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&'keyword self,
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expectedLen: usize,
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) -> Option<impl KeywordComparatorIterator<C> + use<'keyword, Self, C>>;
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}
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pub trait CollectedSubstring: Sized {
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type C: Copy;
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fn compareKeyword(&self, kw: impl Keyword<Self::C>) -> bool;
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}
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impl<'keyword> KeywordComparatorIterator<char> for Chars<'keyword> {
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fn consume(&mut self, e: char) -> bool {
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return self.next().is_some_and(|a| a == e);
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}
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}
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impl Keyword<char> for &str {
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fn startComparation<'keyword>(
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&'keyword self,
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expectedLen: usize,
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) -> Option<impl KeywordComparatorIterator<char>> {
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if self.len() != expectedLen {
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return Option::None;
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}
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return Option::Some(self.chars());
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}
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}
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impl Keyword<char> for &String {
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fn startComparation<'keyword>(
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&'keyword self,
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expectedLen: usize,
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) -> Option<impl KeywordComparatorIterator<char>> {
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if self.len() != expectedLen {
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return Option::None;
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}
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return Option::Some(self.chars());
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}
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}
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impl<'keyword, C: Copy + PartialEq> KeywordComparatorIterator<C> for Iter<'keyword, C> {
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fn consume(&mut self, e: C) -> bool {
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return self.next().is_some_and(|a| a.eq(&e));
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}
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}
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impl<C: Copy + PartialEq> Keyword<C> for &[C] {
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fn startComparation<'keyword>(
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&'keyword self,
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expectedLen: usize,
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) -> Option<impl KeywordComparatorIterator<C>> {
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if self.len() != expectedLen {
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return Option::None;
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}
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return Option::Some(self.iter());
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}
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}
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impl<C: Copy + PartialEq, const SZ: usize> Keyword<C> for &[C; SZ] {
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fn startComparation<'keyword>(
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&'keyword self,
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expectedLen: usize,
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) -> Option<impl KeywordComparatorIterator<C>> {
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if self.len() != expectedLen {
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return Option::None;
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}
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return Option::Some(self.iter());
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}
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}
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