Parser representations

This commit is contained in:
Greg Shuflin 2024-01-31 02:15:50 -08:00
parent 9ed860383e
commit 0829b16fc9
4 changed files with 33 additions and 9 deletions

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@ -23,6 +23,10 @@ where
fn name(&self) -> Option<String> {
self.name.clone()
}
fn representation(&self) -> Option<Representation> {
self.repr.clone()
}
}
impl<P, I, O, E> AnnotatedParser<P, I, O, E>

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@ -1,4 +1,4 @@
use crate::{annotated::AnnotatedParser, map, seq2, surrounded_by};
use crate::{annotated::AnnotatedParser, map, representation::Representation, seq2, surrounded_by};
pub type ParseResult<I, O, E> = Result<(O, I), (E, I)>;
@ -7,6 +7,9 @@ pub trait Parser<I, O, E> {
fn name(&self) -> Option<String> {
None
}
fn representation(&self) -> Option<Representation> {
None
}
}
impl<I, O, E, F> Parser<I, O, E> for F

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@ -1,18 +1,25 @@
use crate::{representation::Representation, ParseResult, Parser, ParserExtension};
use crate::{
representation::{Representation, EBNF},
ParseResult, Parser, ParserExtension,
};
pub fn literal<'a>(expected: &'static str) -> impl Parser<&'a str, &'a str, ()> {
let p = move |input: &'a str| match input.get(0..expected.len()) {
Some(next) if next == expected => Ok((next, &input[expected.len()..])),
_ => Err(((), input)),
};
p.to_anno().with_repr(Representation::new())
let production = EBNF::StringTerminal(expected.into());
p.to_anno()
.with_repr(Representation::new().with_production(production))
}
pub fn literal_char<'a>(expected: char) -> impl Parser<&'a str, char, ()> {
move |input: &'a str| match input.chars().next() {
(move |input: &'a str| match input.chars().next() {
Some(ch) if ch == expected => Ok((expected, &input[ch.len_utf8()..])),
_ => Err(((), input)),
}
})
.to_anno()
.with_repr(Representation::new().with_production(EBNF::CharTerminal(expected)))
}
pub fn one_of<'a>(items: &'static str) -> impl Parser<&'a str, char, ()> {
@ -64,5 +71,8 @@ mod tests {
fn literals() {
let parser = literal_char('f');
assert_eq!(Ok(('f', "unky")), parser.parse("funky"));
let repr = parser.representation().unwrap();
assert!(matches!(repr.production(), EBNF::CharTerminal('f')));
}
}

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@ -2,7 +2,7 @@ use std::fmt;
use crate::util::intersperse_option;
#[derive(Debug)]
#[derive(Debug, Clone)]
pub struct Representation {
production_output: EBNF,
}
@ -12,18 +12,25 @@ impl Representation {
self.production_output.to_string()
}
pub fn production(&self) -> EBNF {
self.production_output.clone()
}
pub fn new() -> Self {
Self {
production_output: EBNF::None,
}
}
pub fn with_production(production_output: EBNF) -> Self {
Self { production_output }
pub fn with_production(self, production_output: EBNF) -> Self {
Self {
production_output,
..self
}
}
}
#[derive(Debug)]
#[derive(Debug, Clone)]
pub enum EBNF {
None,
Nonterminal(String),