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Implement the try keyword with desugaring

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Sam Mohr 2024-11-01 17:34:11 -07:00
parent 69dd8d77f3
commit 308defac46
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9 changed files with 196 additions and 10 deletions
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15
crates/compiler/parse/src/expr.rs
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@ -195,6 +195,7 @@ fn loc_term_or_underscore_or_conditional<'a>(
loc(specialize_err(EExpr::Closure, closure_help(options))),
loc(crash_kw()),
loc(specialize_err(EExpr::Dbg, dbg_kw())),
loc(try_kw()),
loc(underscore_expression()),
loc(record_literal_help()),
loc(specialize_err(EExpr::List, list_literal_help())),
@ -217,6 +218,7 @@ fn loc_term_or_underscore<'a>(
)),
loc(specialize_err(EExpr::Closure, closure_help(options))),
loc(specialize_err(EExpr::Dbg, dbg_kw())),
loc(try_kw()),
loc(underscore_expression()),
loc(record_literal_help()),
loc(specialize_err(EExpr::List, list_literal_help())),
@ -235,6 +237,7 @@ fn loc_term<'a>(options: ExprParseOptions) -> impl Parser<'a, Loc<Expr<'a>>, EEx
)),
loc(specialize_err(EExpr::Closure, closure_help(options))),
loc(specialize_err(EExpr::Dbg, dbg_kw())),
loc(try_kw()),
loc(record_literal_help()),
loc(specialize_err(EExpr::List, list_literal_help())),
ident_seq(),
@ -2129,6 +2132,8 @@ fn expr_to_pattern_help<'a>(arena: &'a Bump, expr: &Expr<'a>) -> Result<Pattern<
pattern
}
Expr::Try => Pattern::Identifier { ident: "try" },
Expr::SpaceBefore(..) | Expr::SpaceAfter(..) | Expr::ParensAround(..) => unreachable!(),
Expr::Record(fields) => {
@ -2712,6 +2717,16 @@ fn dbg_kw<'a>() -> impl Parser<'a, Expr<'a>, EExpect<'a>> {
.trace("dbg_kw")
}
fn try_kw<'a>() -> impl Parser<'a, Expr<'a>, EExpr<'a>> {
(move |arena: &'a Bump, state: State<'a>, min_indent: u32| {
let (_, _, next_state) =
parser::keyword("try", EExpr::Try).parse(arena, state, min_indent)?;
Ok((MadeProgress, Expr::Try, next_state))
})
.trace("try_kw")
}
fn import<'a>() -> impl Parser<'a, ValueDef<'a>, EImport<'a>> {
skip_second(
skip_first(