[vala/wip/transform: 215/237] Cleanup generated empty blocks

[Rico Tzschichholz <ricotz src gnome org>]

commit 593d4fb5b5c6cc0021a4904d9aa84d8e40e5b8df
Author: Luca Bruno <lucabru src gnome org>
Date:   Sat Feb 1 10:42:27 2014 +0100

    Cleanup generated empty blocks

 vala/valablock.vala           |   17 +++++++++++++++++
 vala/valacodebuilder.vala     |    6 ++++++
 vala/valacodetransformer.vala |    2 ++
 3 files changed, 25 insertions(+), 0 deletions(-)
---
diff --git a/vala/valablock.vala b/vala/valablock.vala
index 6d9cf74..3f2de5f 100644
--- a/vala/valablock.vala
+++ b/vala/valablock.vala
@@ -195,6 +195,23 @@ public class Vala.Block : Symbol, Statement {
                stmt.prev = new_stmt;
        }
 
+       public void remove_statement (Statement stmt) {
+               var prev = stmt.prev;
+               var next = stmt.next;
+               
+               if (prev != null) {
+                       prev.next = next;
+               } else {
+                       first_statement = next;
+               }
+               
+               if (next != null) {
+                       next.prev = prev;
+               } else {
+                       last_statement = prev;
+               }
+       }
+       
        public void replace_statement (Statement old_stmt, Statement new_stmt) {
                new_stmt.parent_node = this;
                new_stmt.prev = old_stmt.prev;
diff --git a/vala/valacodebuilder.vala b/vala/valacodebuilder.vala
index ea7262b..2d5e364 100644
--- a/vala/valacodebuilder.vala
+++ b/vala/valacodebuilder.vala
@@ -46,6 +46,12 @@ public class Vala.CodeBuilder {
                m.body.add_statement (current_block);
        }
 
+       public void cleanup () {
+               if (current_block.first_statement == null) {
+                       insert_block.remove_statement (current_block);
+               }
+       }
+
        public void check (CodeTransformer transformer) {
                foreach (var node in decl_nodes) {
                        transformer.check (node);
diff --git a/vala/valacodetransformer.vala b/vala/valacodetransformer.vala
index 23b10fd..ffb55ec 100644
--- a/vala/valacodetransformer.vala
+++ b/vala/valacodetransformer.vala
@@ -40,6 +40,8 @@ public class Vala.CodeTransformer : CodeVisitor {
        }
 
        public void pop_builder () {
+               b.cleanup ();
+               
                b = builder_stack[builder_stack.size - 1];
                builder_stack.remove_at (builder_stack.size - 1);
        }