[vala/0.40] Add TraverseVisitor for traversing the tree with a callback

[Rico Tzschichholz <ricotz src gnome org>]

commit 0e23d7119b95dea1333a45196b7333af039d9d17
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Fri Oct 26 14:08:59 2018 +0200

    Add TraverseVisitor for traversing the tree with a callback
    
    This will allow cleaning up virtual methods of code nodes
    and more stateful to stateless code conversion.

 vala/Makefile.am              |   1 +
 vala/valatraversevisitor.vala | 387 ++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 388 insertions(+)
---
diff --git a/vala/Makefile.am b/vala/Makefile.am
index c3974aae2..24930b442 100644
--- a/vala/Makefile.am
+++ b/vala/Makefile.am
@@ -150,6 +150,7 @@ libvala_la_VALASOURCES = \
        valatemplate.vala \
        valathrowstatement.vala \
        valatokentype.vala \
+       valatraversevisitor.vala \
        valatrystatement.vala \
        valatuple.vala \
        valatypecheck.vala \
diff --git a/vala/valatraversevisitor.vala b/vala/valatraversevisitor.vala
new file mode 100644
index 000000000..d604d68fb
--- /dev/null
+++ b/vala/valatraversevisitor.vala
@@ -0,0 +1,387 @@
+/* valatraversevisitor.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>
+ */
+
+/**
+ * Code visitor for traversing the tree with a simple callback
+ */
+public class Vala.TraverseVisitor : CodeVisitor {
+       private TraverseFunc func;
+
+       public TraverseVisitor (owned TraverseFunc func) {
+               this.func = (owned) func;
+       }
+
+       public override void visit_namespace (Namespace ns) {
+               if (func (ns) == TraverseStatus.CONTINUE) {
+                       ns.accept_children (this);
+               }
+       }
+
+       public override void visit_class (Class cl) {
+               if (func (cl) == TraverseStatus.CONTINUE) {
+                       cl.accept_children (this);
+               }
+       }
+
+       public override void visit_struct (Struct st) {
+               if (func (st) == TraverseStatus.CONTINUE) {
+                       st.accept_children (this);
+               }
+       }
+
+       public override void visit_interface (Interface iface) {
+               if (func (iface) == TraverseStatus.CONTINUE) {
+                       iface.accept_children (this);
+               }
+       }
+
+       public override void visit_enum (Enum en) {
+               if (func (en) == TraverseStatus.CONTINUE) {
+                       en.accept_children (this);
+               }
+       }
+
+       public override void visit_enum_value (EnumValue ev) {
+               if (func (ev) == TraverseStatus.CONTINUE) {
+                       ev.accept_children (this);
+               }
+       }
+
+       public override void visit_error_domain (ErrorDomain edomain) {
+               if (func (edomain) == TraverseStatus.CONTINUE) {
+                       edomain.accept_children (this);
+               }
+       }
+
+       public override void visit_error_code (ErrorCode ecode) {
+               if (func (ecode) == TraverseStatus.CONTINUE) {
+                       ecode.accept_children (this);
+               }
+       }
+
+       public override void visit_delegate (Delegate d) {
+               if (func (d) == TraverseStatus.CONTINUE) {
+                       d.accept_children (this);
+               }
+       }
+
+       public override void visit_constant (Constant c) {
+               if (func (c) == TraverseStatus.CONTINUE) {
+                       c.accept_children (this);
+               }
+       }
+
+       public override void visit_field (Field f) {
+               if (func (f) == TraverseStatus.CONTINUE) {
+                       f.accept_children (this);
+               }
+       }
+
+       public override void visit_method (Method m) {
+               if (func (m) == TraverseStatus.CONTINUE) {
+                       m.accept_children (this);
+               }
+       }
+
+       public override void visit_creation_method (CreationMethod m) {
+               if (func (m) == TraverseStatus.CONTINUE) {
+                       m.accept_children (this);
+               }
+       }
+
+       public override void visit_formal_parameter (Parameter p) {
+               if (func (p) == TraverseStatus.CONTINUE) {
+                       p.accept_children (this);
+               }
+       }
+
+       public override void visit_property (Property prop) {
+               if (func (prop) == TraverseStatus.CONTINUE) {
+                       prop.accept_children (this);
+               }
+       }
+
+       public override void visit_property_accessor (PropertyAccessor acc) {
+               if (func (acc) == TraverseStatus.CONTINUE) {
+                       acc.accept_children (this);
+               }
+       }
+
+       public override void visit_signal (Signal sig) {
+               if (func (sig) == TraverseStatus.CONTINUE) {
+                       sig.accept_children (this);
+               }
+       }
+
+       public override void visit_constructor (Constructor c) {
+               if (func (c) == TraverseStatus.CONTINUE) {
+                       c.accept_children (this);
+               }
+       }
+
+       public override void visit_destructor (Destructor d) {
+               if (func (d) == TraverseStatus.CONTINUE) {
+                       d.accept_children (this);
+               }
+       }
+
+       public override void visit_block (Block b) {
+               if (func (b) == TraverseStatus.CONTINUE) {
+                       b.accept_children (this);
+               }
+       }
+
+       public override void visit_declaration_statement (DeclarationStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_local_variable (LocalVariable local) {
+               if (func (local) == TraverseStatus.CONTINUE) {
+                       local.accept_children (this);
+               }
+       }
+
+       public override void visit_initializer_list (InitializerList list) {
+               if (func (list) == TraverseStatus.CONTINUE) {
+                       list.accept_children (this);
+               }
+       }
+
+       public override void visit_expression_statement (ExpressionStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_if_statement (IfStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_switch_statement (SwitchStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_switch_section (SwitchSection section) {
+               if (func (section) == TraverseStatus.CONTINUE) {
+                       section.accept_children (this);
+               }
+       }
+
+       public override void visit_switch_label (SwitchLabel label) {
+               if (func (label) == TraverseStatus.CONTINUE) {
+                       label.accept_children (this);
+               }
+       }
+
+       public override void visit_loop (Loop loop) {
+               if (func (loop) == TraverseStatus.CONTINUE) {
+                       loop.accept_children (this);
+               }
+       }
+
+       public override void visit_while_statement (WhileStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_do_statement (DoStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_for_statement (ForStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_foreach_statement (ForeachStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_break_statement (BreakStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_continue_statement (ContinueStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_return_statement (ReturnStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_yield_statement (YieldStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_throw_statement (ThrowStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_try_statement (TryStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_catch_clause (CatchClause clause) {
+               if (func (clause) == TraverseStatus.CONTINUE) {
+                       clause.accept_children (this);
+               }
+       }
+
+       public override void visit_lock_statement (LockStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_unlock_statement (UnlockStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_delete_statement (DeleteStatement stmt) {
+               if (func (stmt) == TraverseStatus.CONTINUE) {
+                       stmt.accept_children (this);
+               }
+       }
+
+       public override void visit_member_access (MemberAccess expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_assignment (Assignment expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_method_call (MethodCall expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_conditional_expression (ConditionalExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_binary_expression (BinaryExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_unary_expression (UnaryExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_reference_transfer_expression (ReferenceTransferExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_object_creation_expression (ObjectCreationExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_postfix_expression (PostfixExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_array_creation_expression (ArrayCreationExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_cast_expression (CastExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_element_access (ElementAccess expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_lambda_expression (LambdaExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_pointer_indirection (PointerIndirection expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+
+       public override void visit_slice_expression (SliceExpression expr) {
+               if (func (expr) == TraverseStatus.CONTINUE) {
+                       expr.accept_children (this);
+               }
+       }
+}
+
+public enum Vala.TraverseStatus {
+       STOP,
+       CONTINUE
+}
+
+public delegate Vala.TraverseStatus Vala.TraverseFunc (CodeNode node);