59 lines
1.5 KiB
Rust
59 lines
1.5 KiB
Rust
|
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
|
||
|
|
// file at the top-level directory of this distribution and at
|
||
|
|
// http://rust-lang.org/COPYRIGHT.
|
||
|
|
//
|
||
|
|
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
|
||
|
|
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
|
||
|
|
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
|
||
|
|
// option. This file may not be copied, modified, or distributed
|
||
|
|
// except according to those terms.
|
||
|
|
|
||
|
|
trait Matcher {
|
||
|
|
fn next_match(&mut self) -> Option<(uint, uint)>;
|
||
|
|
}
|
||
|
|
|
||
|
|
struct CharPredMatcher<'a, 'b> {
|
||
|
|
str: &'a str,
|
||
|
|
pred: |char|:'b -> bool
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<'a, 'b> Matcher for CharPredMatcher<'a, 'b> {
|
||
|
|
fn next_match(&mut self) -> Option<(uint, uint)> {
|
||
|
|
None
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
trait IntoMatcher<'a, T> {
|
||
|
|
fn into_matcher(self, &'a str) -> T;
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<'a, 'b> IntoMatcher<'a, CharPredMatcher<'a, 'b>> for |char|:'b -> bool {
|
||
|
|
fn into_matcher(self, s: &'a str) -> CharPredMatcher<'a, 'b> {
|
||
|
|
CharPredMatcher {
|
||
|
|
str: s,
|
||
|
|
pred: self
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct MatchIndices<M> {
|
||
|
|
matcher: M
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<M: Matcher> Iterator<(uint, uint)> for MatchIndices<M> {
|
||
|
|
fn next(&mut self) -> Option<(uint, uint)> {
|
||
|
|
self.matcher.next_match()
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
fn match_indices<'a, M, T: IntoMatcher<'a, M>>(s: &'a str, from: T) -> MatchIndices<M> {
|
||
|
|
let string_matcher = from.into_matcher(s);
|
||
|
|
MatchIndices { matcher: string_matcher }
|
||
|
|
}
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
let s = "abcbdef";
|
||
|
|
match_indices(s, |c: char| c == 'b')
|
||
|
|
.collect::<Vec<(uint, uint)>>();
|
||
|
|
}
|