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31
src/lib.rs
31
src/lib.rs
@ -1,14 +1,35 @@
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pub fn add(left: usize, right: usize) -> usize {
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left + right
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#![feature(assert_matches)]
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#![allow(dead_code)] //TODO eventually turn this off
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type ParseResult<I, O, E> = Result<(O, I), E>;
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trait Parser<I, O, E> {
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fn parse(&self, input: I) -> ParseResult<I, O, E>;
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}
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impl<I, O, E, F> Parser<I, O, E> for F where F: Fn(I) -> ParseResult<I, O, E> {
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fn parse(&self, input: I) -> ParseResult<I, O, E> {
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self(input)
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}
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}
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fn literal(expected: &'static str) -> impl Fn(&str) -> ParseResult<&str, (), &str> {
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move |input| match input.get(0..expected.len()) {
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Some(next) if next == expected =>
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Ok(((), &input[expected.len()..])),
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_ => Err(input)
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use std::assert_matches::assert_matches;
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#[test]
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fn it_works() {
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let result = add(2, 2);
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assert_eq!(result, 4);
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fn parsing() {
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let output = literal("a")("a yolo");
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assert_matches!(output.unwrap(), ((), " yolo"));
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}
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}
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