[vala] Report error on use of tuples

[Jürg Billeter <juergbi src gnome org>]

commit c5ea5f55ab483330858a2d374ff13e7f45d9a2b8
Author: Jürg Billeter <j bitron ch>
Date:   Sat Mar 13 17:32:48 2010 +0100

    Report error on use of tuples
    
    Tuples are not supported as primary expressions.
    
    Based on patch by Adam Folmert, fixes bug 597955.

 vala/valaparser.vala |    6 ++++--
 vala/valatuple.vala  |   17 +++++++++++++++--
 2 files changed, 19 insertions(+), 4 deletions(-)
---
diff --git a/vala/valaparser.vala b/vala/valaparser.vala
index b3d3454..d0649cd 100644
--- a/vala/valaparser.vala
+++ b/vala/valaparser.vala
@@ -1,6 +1,6 @@
 /* valaparser.vala
  *
- * Copyright (C) 2006-2009  Jürg Billeter
+ * Copyright (C) 2006-2010  Jürg Billeter
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -632,6 +632,8 @@ public class Vala.Parser : CodeVisitor {
 	}
 
 	Expression parse_tuple () throws ParseError {
+		var begin = get_location ();
+
 		expect (TokenType.OPEN_PARENS);
 		var expr_list = new ArrayList<Expression> ();
 		if (current () != TokenType.CLOSE_PARENS) {
@@ -641,7 +643,7 @@ public class Vala.Parser : CodeVisitor {
 		}
 		expect (TokenType.CLOSE_PARENS);
 		if (expr_list.size != 1) {
-			var tuple = new Tuple ();
+			var tuple = new Tuple (get_src (begin));
 			foreach (Expression expr in expr_list) {
 				tuple.add_expression (expr);
 			}
diff --git a/vala/valatuple.vala b/vala/valatuple.vala
index 0efab3e..b723d39 100644
--- a/vala/valatuple.vala
+++ b/vala/valatuple.vala
@@ -1,6 +1,6 @@
 /* valatuple.vala
  *
- * Copyright (C) 2006-2008  Jürg Billeter
+ * Copyright (C) 2006-2010  Jürg Billeter
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
@@ -28,7 +28,8 @@ using GLib;
 public class Vala.Tuple : Expression {
 	private List<Expression> expression_list = new ArrayList<Expression> ();
 
-	public Tuple () {
+	public Tuple (SourceReference? source_reference = null) {
+		this.source_reference = source_reference;
 	}
 
 	public void add_expression (Expression expr) {
@@ -42,5 +43,17 @@ public class Vala.Tuple : Expression {
 	public override bool is_pure () {
 		return false;
 	}
+
+	public override bool check (SemanticAnalyzer analyzer) {
+		if (checked) {
+			return !error;
+		}
+
+		checked = true;
+
+		Report.error (source_reference, "tuples are not supported");
+		error = true;
+		return false;
+	}
 }