Expand parser more

schala-lang/language/src/parser.rs

@@ -7,7 +7,7 @@ use nom::IResult;
 use nom::character::complete::{one_of, space0, alphanumeric0};
 use nom::bytes::complete::{tag, take, take_while, take_until};
 use nom::combinator::{map, map_res, value, opt, verify};
-use nom::multi::{separated_list, many1, many0};
+use nom::multi::{separated_list, separated_nonempty_list, many1, many0};
 //use nom::error::{ParseError, ErrorKind};
 use nom::branch::alt;
 use nom::sequence::{pair, delimited};
@@ -117,12 +117,27 @@ fn prefix_op(input: &str) -> IResult<&str, PrefixOp> {
   map(p, |sigil| PrefixOp::from_str(&sigil.to_string()).unwrap())(input)
 }
 
+fn identifier_expr(text: &str) -> IResult<&str, ExpressionKind> {
+  let (text, qualified_identifier) = map(
+    qualified_identifier_list,
+    |components| QualifiedName { id: ItemId::new(0), components }
+  )(text)?;
+  //TODO handle struct literals
+  let exp = Expression::new(ItemId::new(0), ExpressionKind::Value(qualified_identifier));
+  Ok((text, exp.kind))
+}
+
+fn qualified_identifier_list(text: &str) -> IResult<&str, Vec<Rc<String>>> {
+  separated_nonempty_list(tag("::"), identifier)(text)
+}
+
 fn primary_expr(text: &str) -> IResult<&str, ExpressionKind> {
   // primary := literal | paren_expr | if_expr | for_expr | while_expr | identifier_expr | lambda_expr | anonymous_struct | list_expr
 
   alt((
     literal,
     paren_expr,
+    identifier_expr,
   ))(text)
 }
 
@@ -153,10 +168,7 @@ fn call_expr(text: &str) -> IResult<&str, ExpressionKind> {
 
 fn prefix_expr(text: &str) -> IResult<&str, ExpressionKind> {
   let (text, pfx) = delimited(space0, opt(prefix_op), space0)(text)?;
-  let (text, result) = alt((
-    paren_expr,
-    literal,
-  ))(text)?;
+  let (text, result) = call_expr(text)?;
   match pfx {
     None => Ok((text, result)),
     Some(pfx) => {
@@ -196,7 +208,6 @@ fn expression_kind(input: &str) -> IResult<&str, ExpressionKind> {
 }
 
 pub fn perform_parsing(input: &str) -> Result<String, String> {
-  //let output = expression_kind(input);
-  let output = identifier(input);
+  let output = expression_kind(input);
   Ok(format!("{:?}", output))
 }