[vala/wip/transform: 27/106] Code builder

[Rico Tzschichholz <ricotz src gnome org>]

commit e5f2c3105d5d6703767c4691da53b3e9fc81160f
Author: Luca Bruno <lucabru src gnome org>
Date:   Thu Dec 29 19:42:55 2011 +0100

    Code builder

 vala/Makefile.am          |   1 +
 vala/valacodebuilder.vala | 156 ++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 157 insertions(+)
---
diff --git a/vala/Makefile.am b/vala/Makefile.am
index ccf80e4bd..d341e7659 100644
--- a/vala/Makefile.am
+++ b/vala/Makefile.am
@@ -48,6 +48,7 @@ libvala_la_VALASOURCES = \
        valacharacterliteral.vala \
        valaclass.vala \
        valaclasstype.vala \
+       valacodebuilder.vala \
        valacodecontext.vala \
        valacodegenerator.vala \
        valacodenode.vala \
diff --git a/vala/valacodebuilder.vala b/vala/valacodebuilder.vala
new file mode 100644
index 000000000..1b40f3966
--- /dev/null
+++ b/vala/valacodebuilder.vala
@@ -0,0 +1,156 @@
+/* valacodebuilder.vala
+ *
+ * Copyright (C) 2012  Luca Bruno
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ *     Luca Bruno <lucabru src gnome org>
+ */
+
+using GLib;
+
+public class Vala.CodeBuilder {
+       Block current_block;
+       Statement insert_statement;
+       Block insert_block;
+       public SourceReference source_reference;
+       ArrayList<Statement> statement_stack = new ArrayList<Statement> ();
+       public ArrayList<CodeNode> check_nodes = new ArrayList<CodeNode> ();
+
+       public CodeBuilder (CodeContext context, Statement insert_statement, SourceReference 
source_reference) {
+               this.current_block = new Block (source_reference);
+               this.insert_statement = insert_statement;
+               this.insert_block = context.analyzer.get_insert_block (insert_statement);
+               this.source_reference = source_reference;
+
+               var statement_block = context.analyzer.get_current_block (insert_statement);
+               statement_block.insert_before (insert_statement, current_block);
+               this.insert_statement = current_block;
+
+               check_nodes.add (current_block);
+       }
+
+       public void open_block () {
+               statement_stack.add (current_block);
+               var parent_block = current_block;
+
+               current_block = new Block (source_reference);
+
+               parent_block.add_statement (current_block);
+       }
+
+       public void open_if (Expression condition) {
+               statement_stack.add (current_block);
+               var parent_block = current_block;
+
+               current_block = new Block (source_reference);
+
+               var stmt = new IfStatement (condition, current_block, null, source_reference);
+               statement_stack.add (stmt);
+
+               parent_block.add_statement (stmt);
+       }
+
+       public void add_else () {
+               current_block = new Block (source_reference);
+
+               var stmt = (IfStatement) statement_stack[statement_stack.size-1];
+               assert (stmt.false_statement == null);
+               stmt.false_statement = current_block;
+       }
+
+       public void else_if (Expression condition) {
+               var parent_if = (IfStatement) statement_stack[statement_stack.size - 1];
+               assert (parent_if.false_statement == null);
+
+               statement_stack.remove_at (statement_stack.size - 1);
+
+               current_block = new Block (source_reference);
+
+               var stmt = new IfStatement (condition, current_block, null, source_reference);
+               var block = new Block (source_reference);
+               block.add_statement (stmt);
+               parent_if.false_statement = block;
+               statement_stack.add (stmt);
+       }
+
+       public void open_while (Expression condition) {
+               statement_stack.add (current_block);
+               var parent_block = current_block;
+
+               current_block = new Block (source_reference);
+
+               var stmt = new WhileStatement (condition, current_block, source_reference);
+               parent_block.add_statement (stmt);
+       }
+
+       public void open_for (Expression? initializer, Expression condition, Expression? iterator) {
+               statement_stack.add (current_block);
+               var parent_block = current_block;
+
+               current_block = new Block (source_reference);
+
+               var stmt = new ForStatement (condition, current_block, source_reference);
+               if (initializer != null) {
+                       stmt.add_initializer (initializer);
+               }
+               if (iterator != null) {
+                       stmt.add_iterator (iterator);
+               }
+
+               parent_block.add_statement (stmt);
+       }
+
+       public void add_statement (Statement statement) {
+               current_block.add_statement (statement);
+       }
+
+       public void add_expression (Expression expression) {
+               add_statement (new ExpressionStatement (expression, source_reference));
+       }
+
+       public void add_assignment (Expression left, Expression right) {
+               add_expression (new Assignment (left, right, AssignmentOperator.SIMPLE, source_reference));
+       }
+
+       public void add_return (Expression? expression = null) {
+               add_statement (new ReturnStatement (expression, source_reference));
+       }
+
+       public void add_break () {
+               add_statement (new BreakStatement (source_reference));
+       }
+
+       public void add_continue () {
+               add_statement (new ContinueStatement (source_reference));
+       }
+
+       public string add_temp_declaration (DataType? type, Expression? initializer = null) {
+               var local = new LocalVariable (type, CodeNode.get_temp_name (), initializer, 
source_reference);
+               var stmt = new DeclarationStatement (local, source_reference);
+               insert_block.insert_before (insert_statement, stmt);
+               check_nodes.insert (0, stmt);
+               return local.name;
+       }
+
+       public void close () {
+               do {
+                       var top = statement_stack[statement_stack.size - 1];
+                       statement_stack.remove_at (statement_stack.size - 1);
+                       current_block = top as Block;
+               } while (current_block == null);
+       }
+}