chronlang-parser 0.1.7

A parser for Chronlang, a computer language for crafting constructed languages.
Documentation 
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use chumsky::{prelude::*, text::{newline, ident, whitespace}};
use crate::parser::common::*;

use crate::ast::{
  Definition,
  Stmt,
};

fn definition() -> impl Parser<char, Definition, Error = Simple<char>> {
  ident()
    .map_with_span(|pos, span| (span, pos))
    .then_ignore(just("."))
    .padded()
    .or_not()
    .then(
      description()
        .map_with_span(|def, span| (span, def))
    )
    .map(|(pos, definition)|  Definition { pos, definition })
}

fn definition_block() -> impl Parser<char, Vec<Definition>, Error = Simple<char>> {
  definition()
    .separated_by(newline().then(whitespace()))
    .allow_leading()
    .allow_trailing()
    .at_least(1)
    .delimited_by(just("{"), just("}"))
}

pub fn parser() -> impl Parser<char, Stmt, Error = Simple<char>> {
  let start = just("-").padded();

  let gloss = ident()
    .map_with_span(|g, span| (span, g));

  let pronunciation = syllable()
    .separated_by(just("."))
    .at_least(1)
    .delimited_by(just("/"), just("/"))
    .map_with_span(|p, span| (span, p))
    .padded();

  let definitions = whitespace().ignore_then(
    definition_block()
      .or(definition().map(|d| vec![d]))
  );

  start
    .ignore_then(gloss)
    .then(pronunciation)
    .then(definitions)
    .map(|((gloss, pronunciation), definitions)| Stmt::Word { gloss, pronunciation, definitions })
}

#[cfg(test)]
mod test {
  use super::*;

  #[test]
  fn it_parses_a_word_with_an_inline_definition() {
    let src = "- water /'wa.ter/ noun. the liquid state of H20";
    assert_eq!(
      parser().parse(src.to_string()),
      Ok(
        Stmt::Word {
          gloss: (2..7, "water".to_string()),
          pronunciation: (8..17, vec!["'wa".to_string(), "ter".to_string()]),
          definitions: vec![
            Definition {
              pos: Some((18..22, "noun".to_string())),
              definition: (24..47, "the liquid state of H20".to_string()),
            }
          ],
        },
      )
    )
  }

  #[test]
  fn it_parses_a_word_with_one_definition() {
    let src = "
      - water /'wa.ter/ {
        noun. the liquid state of H20
      }
    ";
    assert_eq!(
      parser().parse(src.to_string()),
      Ok(
        Stmt::Word {
          gloss: (9..14, "water".to_string()),
          pronunciation: (15..24, vec!["'wa".to_string(), "ter".to_string()]),
          definitions: vec![
            Definition {
              pos: Some((35..39, "noun".to_string())),
              definition: (41..64, "the liquid state of H20".to_string()),
            }
          ],
        },
      )
    )
  }

  #[test]
  fn it_parses_a_word_with_multiple_definitions() {
    let src = "
      - water /'wa.ter/ {
        noun. the liquid state of H20
        verb. to pour water over a plant or area of land
      }
    ";
    assert_eq!(
      parser().parse(src.to_string()),
      Ok(
        Stmt::Word {
          gloss: (9..14, "water".to_string()),
          pronunciation: (15..24, vec!["'wa".to_string(), "ter".to_string()]),
          definitions: vec![
            Definition {
              pos: Some((35..39, "noun".to_string())),
              definition: (41..64, "the liquid state of H20".to_string()),
            },
            Definition {
              pos: Some((73..77, "verb".to_string())),
              definition: (79..121, "to pour water over a plant or area of land".to_string()),
            },
          ],
        },
      )
    )
  }
}