[vala/wip/transform: 788/793] Fix string templates

[Rico Tzschichholz <ricotz src gnome org>]

commit 53da3f689574f3be704d16ca2f09f1b66042c096
Author: Luca Bruno <luca bruno immobiliare it>
Date:   Mon Jul 7 09:57:08 2014 +0200

    Fix string templates

 vala/valacodetransformer.vala |    2 +-
 vala/valatemplate.vala        |    8 ++++++++
 2 files changed, 9 insertions(+), 1 deletions(-)
---
diff --git a/vala/valacodetransformer.vala b/vala/valacodetransformer.vala
index 853c9b4..2c8c199 100644
--- a/vala/valacodetransformer.vala
+++ b/vala/valacodetransformer.vala
@@ -295,7 +295,7 @@ public class Vala.CodeTransformer : CodeVisitor {
        }
 
        public Expression stringify (Expression expr) {
-               if (expr.value_type.data_type != null && expr.value_type.data_type.is_subtype_of 
(context.analyzer.string_type.data_type)) {
+               if (expr.value_type != null && expr.value_type.data_type != null && 
expr.value_type.data_type.is_subtype_of (context.analyzer.string_type.data_type)) {
                        return expr;
                } else {
                        return expression (@"%?.to_string ()", {expr});
diff --git a/vala/valatemplate.vala b/vala/valatemplate.vala
index ce458bd..69723df 100644
--- a/vala/valatemplate.vala
+++ b/vala/valatemplate.vala
@@ -47,6 +47,14 @@ public class Vala.Template : Expression {
                return expression_list;
        }
 
+       public override void replace_expression (Expression old_node, Expression new_node) {
+               int index = expression_list.index_of (old_node);
+               if (index >= 0) {
+                       expression_list[index] = new_node;
+                       new_node.parent_node = this;
+               }
+       }
+
        public override bool is_pure () {
                return false;
        }