mist-parser 0.3.0-alpha.0

The Mist programming language parser
Documentation 
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use crate::{
    Rule,
    ast::*,
    ast_ensure, ast_expr,
    error::{AstError, AstResult, IntoErr, collect_recovered},
    parser::{consume_rule, listen_rule},
};

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for TypeExpr {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        let rule = pair.as_rule();
        let mut inner = pair.clone().into_inner();

        match rule {
            Rule::generic => Self::try_from(inner.next().unwrap()),
            Rule::type_expr => inner.next().unwrap().try_into(),
            Rule::lifetime => ast_expr!(TypeExpr::Lifetime(inner.next().unwrap().try_into())),

            Rule::tuple_type => ast_expr!(TypeExpr::Tuple(collect_recovered(inner))),
            Rule::path_type => {
                ast_expr!(TypeExpr::Path(
                    Path::try_from(inner.next().unwrap()),
                    inner.next().map(Generics::try_from).transpose()
                ))
            }

            Rule::ref_type => {
                ast_expr!(TypeExpr::Ref {
                    lifetime: consume_rule(&mut inner, Rule::lifetime)
                        .map(|v| v.into_inner().next().map(Identifier::try_from))
                        .unwrap_or_default()
                        .transpose(),
                    mutable: Ok(listen_rule(&mut inner, Rule::mutable)) as AstResult<bool>,
                    ty: TypeExpr::try_from(inner.next().unwrap()).map(Box::new),
                })
            }
            Rule::dyn_type => {
                ast_expr!(TypeExpr::Dyn(
                    TypeExpr::try_from(inner.next().unwrap()).map(Box::new),
                ))
            }

            _ => AstError::bug_unimplemented(pair),
        }
    }
}

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for GenericsDecl {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        let inner = pair.clone().into_inner();

        ast_ensure!(pair, Rule::generics_decl => {
            ast_expr!(GenericsDecl(collect_recovered(inner)))
        })
    }
}

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for GenericDecl {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        let mut inner = pair.clone().into_inner();

        ast_ensure!(pair, Rule::generic_decl => {
            if let Some(pair) = consume_rule(&mut inner, Rule::lifetime) {
                ast_expr!(GenericDecl::Lifetime(
                    pair.into_inner().next().unwrap().try_into(),
                ))
            } else {
                ast_expr!(GenericDecl::Type(
                    inner.next().unwrap().try_into(),
                    collect_recovered(inner),
                ))
            }
        })
    }
}

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Generics {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        let inner = pair.clone().into_inner();

        ast_ensure!(pair, Rule::generics => {
            ast_expr!(Generics(collect_recovered(inner)))
        })
    }
}

impl<'a> TryFrom<pest::iterators::Pair<'a, Rule>> for Generic {
    type Error = AstError<'a, Self>;

    fn try_from(pair: pest::iterators::Pair<'a, Rule>) -> Result<Self, Self::Error> {
        let mut inner = pair.clone().into_inner();

        ast_ensure!(pair, Rule::generic => {
            if let Some(pair) = consume_rule(&mut inner, Rule::lifetime) {
                ast_expr!(Generic::Lifetime(
                    pair.into_inner().next().unwrap().try_into(),
                ))
            } else {
                ast_expr!(Generic::Type(
                    inner.next().unwrap().try_into()
                ))
            }
        })
    }
}