diff options
Diffstat (limited to 'dhall/src')
| -rw-r--r-- | dhall/src/parser.rs | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/dhall/src/parser.rs b/dhall/src/parser.rs index c4f4ce2..32923e4 100644 --- a/dhall/src/parser.rs +++ b/dhall/src/parser.rs @@ -13,6 +13,7 @@ use crate::core::{bx, Expr, Builtin, Const, V}; pub fn parse_expr_lalrpop(s: &str) -> Result<BoxExpr, lalrpop_util::ParseError<usize, Tok, LexicalError>> { grammar::ExprParser::new().parse(Lexer::new(s)) + // Ok(bx(Expr::BoolLit(false))) } pub type ParseError = pest::error::Error<Rule>; @@ -158,6 +159,14 @@ macro_rules! named { ); } +macro_rules! named_rule { + ($name:ident<$o:ty>; $submac:ident!( $($args:tt)* )) => ( + named!($name<$o>; match_rule!( + Rule::$name => $submac!( $($args)* ), + )); + ); +} + macro_rules! match_children { (@collect, $pairs:expr, ($($args:tt)*), $body:expr, ($($acc:tt)*), ($x:ident : $ty:ident, $($rest:tt)*)) => { match_children!(@collect, $pairs, ($($args)*), $body, ($($acc)*, $x), ($($rest)*)) @@ -301,6 +310,8 @@ named!(eoi<()>; plain_value!(())); named!(str<&'a str>; with_captured_str!(s; { s.trim() })); +named!(raw_str<&'a str>; with_captured_str!(s; s)); + named!(natural<usize>; with_raw_pair!(pair; { pair.as_str().trim() .parse() @@ -333,7 +344,46 @@ named!(partial_record_entries<(Rule, BoxExpr<'a>, BTreeMap<&'a str, ParsedExpr<' ) ); +named_rule!(union_type_entry<(&'a str, BoxExpr<'a>)>; + match_children!((name: str, expr: expression) => (name, expr)) +); + +named_rule!(union_type_entries<BTreeMap<&'a str, ParsedExpr<'a>>>; + match_children!((entries*: union_type_entry) => { + let mut map: BTreeMap<&str, ParsedExpr> = BTreeMap::new(); + for (n, e) in entries { + map.insert(n, *e); + } + map + }) +); + +named_rule!(non_empty_union_type_or_literal<(Option<(&'a str, BoxExpr<'a>)>, BTreeMap<&'a str, ParsedExpr<'a>>)>; + match_children!( + (label: str, e: expression, entries: union_type_entries) => { + (Some((label, e)), entries) + }, + (l: str, e: expression, rest: non_empty_union_type_or_literal) => { + let (x, mut entries) = rest; + entries.insert(l, *e); + (x, entries) + }, + (l: str, e: expression) => { + let mut entries = BTreeMap::new(); + entries.insert(l, *e); + (None, entries) + }, + ) +); + +named_rule!(empty_union_type<()>; plain_value!(())); + named!(expression<BoxExpr<'a>>; match_rule!( + Rule::double_quote_literal => + match_children!((strs*: raw_str) => { + bx(Expr::TextLit(strs.collect())) + }), + Rule::natural_literal_raw => map!(natural; |n| bx(Expr::NaturalLit(n))), Rule::integer_literal_raw => map!(integer; |n| bx(Expr::IntegerLit(n))), @@ -376,6 +426,25 @@ named!(expression<BoxExpr<'a>>; match_rule!( bx(Expr::Pi("_", typ, body)) }), + Rule::merge_expression => + match_children!((x: expression, y: expression, z?: expression) => { + bx(Expr::Merge(x, y, z)) + }), + + Rule::empty_collection => + match_children!((x: str, y: expression) => { + match x { + "Optional" => bx(Expr::OptionalLit(Some(y), vec![])), + "List" => bx(Expr::ListLit(Some(y), vec![])), + _ => unreachable!(), + } + }), + + Rule::non_empty_optional => + match_children!((x: expression, _y: str, z: expression) => { + bx(Expr::OptionalLit(Some(z), vec![*x])) + }), + Rule::annotated_expression => binop!(Expr::Annot), Rule::import_alt_expression => binop!(Expr::ImportAlt), Rule::or_expression => binop!(Expr::BoolOr), @@ -409,6 +478,24 @@ named!(expression<BoxExpr<'a>>; match_rule!( } }), + Rule::union_type_or_literal => + match_children!( + (_e: empty_union_type) => { + bx(Expr::Union(BTreeMap::new())) + }, + (x: non_empty_union_type_or_literal) => { + match x { + (Some((l, e)), entries) => bx(Expr::UnionLit(l, e, entries)), + (None, entries) => bx(Expr::Union(entries)), + } + }, + ), + Rule::non_empty_list_literal_raw => + match_children!((items*: expression) => { + bx(Expr::ListLit(None, items.map(|x| *x).collect())) + }), + + _ => with_rule!(rule; match_children!((exprs*: expression) => { let rulename = format!("{:?}", rule); |