Parser representations
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9ed860383e
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0829b16fc9
@ -23,6 +23,10 @@ where
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fn name(&self) -> Option<String> {
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self.name.clone()
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}
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fn representation(&self) -> Option<Representation> {
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self.repr.clone()
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}
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}
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impl<P, I, O, E> AnnotatedParser<P, I, O, E>
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@ -1,4 +1,4 @@
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use crate::{annotated::AnnotatedParser, map, seq2, surrounded_by};
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use crate::{annotated::AnnotatedParser, map, representation::Representation, seq2, surrounded_by};
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pub type ParseResult<I, O, E> = Result<(O, I), (E, I)>;
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@ -7,6 +7,9 @@ pub trait Parser<I, O, E> {
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fn name(&self) -> Option<String> {
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None
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}
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fn representation(&self) -> Option<Representation> {
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None
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}
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}
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impl<I, O, E, F> Parser<I, O, E> for F
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@ -1,18 +1,25 @@
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use crate::{representation::Representation, ParseResult, Parser, ParserExtension};
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use crate::{
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representation::{Representation, EBNF},
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ParseResult, Parser, ParserExtension,
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};
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pub fn literal<'a>(expected: &'static str) -> impl Parser<&'a str, &'a str, ()> {
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let p = move |input: &'a str| match input.get(0..expected.len()) {
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Some(next) if next == expected => Ok((next, &input[expected.len()..])),
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_ => Err(((), input)),
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};
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p.to_anno().with_repr(Representation::new())
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let production = EBNF::StringTerminal(expected.into());
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p.to_anno()
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.with_repr(Representation::new().with_production(production))
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}
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pub fn literal_char<'a>(expected: char) -> impl Parser<&'a str, char, ()> {
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move |input: &'a str| match input.chars().next() {
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(move |input: &'a str| match input.chars().next() {
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Some(ch) if ch == expected => Ok((expected, &input[ch.len_utf8()..])),
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_ => Err(((), input)),
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}
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})
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.to_anno()
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.with_repr(Representation::new().with_production(EBNF::CharTerminal(expected)))
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}
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pub fn one_of<'a>(items: &'static str) -> impl Parser<&'a str, char, ()> {
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@ -64,5 +71,8 @@ mod tests {
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fn literals() {
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let parser = literal_char('f');
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assert_eq!(Ok(('f', "unky")), parser.parse("funky"));
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let repr = parser.representation().unwrap();
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assert!(matches!(repr.production(), EBNF::CharTerminal('f')));
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}
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}
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@ -2,7 +2,7 @@ use std::fmt;
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use crate::util::intersperse_option;
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#[derive(Debug)]
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#[derive(Debug, Clone)]
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pub struct Representation {
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production_output: EBNF,
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}
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@ -12,18 +12,25 @@ impl Representation {
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self.production_output.to_string()
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}
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pub fn production(&self) -> EBNF {
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self.production_output.clone()
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}
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pub fn new() -> Self {
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Self {
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production_output: EBNF::None,
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}
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}
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pub fn with_production(production_output: EBNF) -> Self {
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Self { production_output }
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pub fn with_production(self, production_output: EBNF) -> Self {
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Self {
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production_output,
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..self
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}
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}
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}
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#[derive(Debug)]
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#[derive(Debug, Clone)]
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pub enum EBNF {
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None,
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Nonterminal(String),
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