various work

schala-lang/src/parsing/combinator.rs

@@ -3,10 +3,10 @@ use nom::{
     branch::alt,
     bytes::complete::{take_till, tag},
     character::complete::{alpha1, alphanumeric0, not_line_ending,none_of, char, one_of, space0, space1, multispace0, line_ending},
-    combinator::{peek, not, value, map, recognize},
+    combinator::{opt, peek, not, value, map, recognize},
     error::{context, VerboseError, ParseError},
     multi::{fold_many1, many1, many0, separated_list1, separated_list0},
-    sequence::{tuple, preceded},
+    sequence::{pair, tuple, preceded},
     IResult, Parser,
 };
  use std::rc::Rc;
@@ -90,13 +90,37 @@ fn block(input: &str) -> ParseResult<Block> {
 
 fn statement(input: &str) -> ParseResult<Statement> {
     context("Parsing-statement",
-    map(expression_kind, |kind| Statement {
+    map(expression, |expr| Statement {
         id: Default::default(),
         location: Default::default(),
-        kind: StatementKind::Expression(Expression::new(Default::default(), kind)),
+        kind: StatementKind::Expression(expr),
     }))(input)
 }
 
+fn expression(input: &str) -> ParseResult<Expression> {
+    map(pair(expression_kind, opt(type_anno)), |(kind, maybe_anno)| {
+        Expression::new(Default::default(), kind)
+    })(input)
+}
+
+fn type_anno(input: &str) -> ParseResult<TypeIdentifier> {
+    preceded(kw(":"), type_identifier)(input)
+}
+
+fn type_identifier(input: &str) -> ParseResult<TypeIdentifier> {
+    /*
+    alt((
+        tuple((kw("("), separated_list0(kw(","), type_identifier), kw(")"))),
+        type_singleton_name
+    ))(input)
+    */
+    unimplemented!()
+}
+
+fn type_singleton_name(input: &str) -> ParseResult<TypeSingletonName> {
+    unimplemented!()
+}
+
 pub fn expression_kind(input: &str) -> ParseResult<ExpressionKind> {
     context("expression-kind", primary_expr)(input)
 }