backup

parse.go

@@ -96,6 +96,35 @@ func parseValue(in *Input) (Expression, error) {
 	}
 }
 
+func parseParamList(in *Input) (Expression, error) {
+	list, err := in.TakeParens(Lparen, Rparen)
+	if err != nil {
+		return nil, err
+	}
+	var params []*Symbol
+	for list.Len() > 0 {
+		p, err := list.TakeParens(LsquareBracket, RsquareBracket)
+		if err != nil {
+			return nil, err
+		}
+		if p.Len() != 2 {
+			return nil, fmt.Errorf("expected parameter in the following form: [identifier type]")
+		}
+		id, ok := p.Peek(0).(*Identifier)
+		if !ok {
+			return nil, noMatch
+		}
+		typ, ok := p.Peek(1).(*Identifier)
+		if !ok {
+			return nil, noMatch
+		}
+		params = append(params, &Symbol{
+			id: ,
+		})
+	}
+	return args, nil
+}
+
 func parseList(in *Input) (Expression, error) {
 	openingParens, ok := in.Pop()
 	if !ok {
@@ -192,11 +221,7 @@ func parseLambda(in *Input) (Expression, error) {
 		return nil, fmt.Errorf("unmatched parenthesis starting at %s", openingParens.Position())
 	}
 	decl := in.Take(idx)
-	tok, ok := decl.Pop()
-	if !ok {
-		return nil, noMatch
-	}
-	if !tok.Equals(LambdaTok) {
+	if tok, ok := decl.Pop(); !ok || !tok.Equals(LambdaTok) {
 		return nil, noMatch
 	}
 	l, err := parseList(decl)