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use crate::{
ast, ast::support, impl_ast_node, impl_from, language::SyntaxNode, AstNode, SyntaxKind,
};
use SyntaxKind::*;
use std::fmt;
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub enum Ty {
Fun(FunTy),
Tuple(TupleTy),
Cons(ConsTy),
Record(RecordTy),
TyVar(TyVarTy),
}
impl AstNode for Ty {
type Language = crate::language::SML;
fn can_cast(kind: SyntaxKind) -> bool {
matches!(kind, FUN_TY | TUPLE_TY_EXP | CON_TY | RECORD_TY | TYVAR_TY)
}
fn cast(node: SyntaxNode) -> Option<Self>
where
Self: Sized,
{
let out = match node.kind() {
FUN_TY => Self::Fun(FunTy { syntax: node }),
TUPLE_TY_EXP => Self::Tuple(TupleTy { syntax: node }),
CON_TY => Self::Cons(ConsTy { syntax: node }),
RECORD_TY => Self::Record(RecordTy { syntax: node }),
TYVAR_TY => Self::TyVar(TyVarTy { syntax: node }),
_ => return None,
};
Some(out)
}
fn syntax(&self) -> &SyntaxNode {
match self {
Self::Fun(inner) => inner.syntax(),
Self::Tuple(inner) => inner.syntax(),
Self::Cons(inner) => inner.syntax(),
Self::Record(inner) => inner.syntax(),
Self::TyVar(inner) => inner.syntax(),
}
}
}
impl fmt::Display for Ty {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.syntax())
}
}
impl_from!(Ty, Fun, FunTy);
impl_from!(Ty, Tuple, TupleTy);
impl_from!(Ty, Cons, ConsTy);
impl_from!(Ty, Record, RecordTy);
impl_from!(Ty, TyVar, TyVarTy);
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct FunTy {
syntax: SyntaxNode,
}
impl_ast_node!(FunTy, FUN_TY);
impl FunTy {
pub fn ty_1(&self) -> Option<ast::Ty> {
support::child(self.syntax())
}
pub fn ty_2(&self) -> Option<ast::Ty> {
support::children(self.syntax()).nth(1)
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct TupleTy {
syntax: SyntaxNode,
}
impl_ast_node!(TupleTy, TUPLE_TY_EXP);
impl TupleTy {
pub fn tys(&self) -> impl Iterator<Item = ast::Ty> {
support::children(self.syntax())
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct ConsTy {
syntax: SyntaxNode,
}
impl_ast_node!(ConsTy, CON_TY);
impl ConsTy {
pub fn tys(&self) -> impl Iterator<Item = ast::Ty> {
support::children(self.syntax())
}
pub fn longtycon(&self) -> Option<ast::LongTyCon> {
support::child(self.syntax())
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct RecordTy {
syntax: SyntaxNode,
}
impl_ast_node!(RecordTy, RECORD_TY);
impl RecordTy {
pub fn tyrows(&self) -> impl Iterator<Item = ast::TyRow> {
support::children(self.syntax())
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct TyRow {
syntax: SyntaxNode,
}
impl_ast_node!(TyRow, TY_ROW);
impl TyRow {
pub fn label(&self) -> Option<ast::Label> {
support::tokens(self.syntax()).next()
}
pub fn ty(&self) -> Option<ast::Ty> {
support::child(self.syntax())
}
}
#[derive(Debug, Clone, PartialEq, Eq, Hash)]
pub struct TyVarTy {
syntax: SyntaxNode,
}
impl_ast_node!(TyVarTy, TYVAR_TY);
impl TyVarTy {
pub fn tyvar(&self) -> Option<ast::TyVar> {
support::tokens(self.syntax()).next()
}
}