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105 lines
3.9 KiB
ObjectPascal
105 lines
3.9 KiB
ObjectPascal
{
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***************************************************************************
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* *
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* This source is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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* This code is distributed in the hope that it will be useful, but *
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* WITHOUT ANY WARRANTY; without even the implied warranty of *
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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* General Public License for more details. *
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* *
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* A copy of the GNU General Public License is available on the World *
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* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
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* obtain it by writing to the Free Software Foundation, *
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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* *
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***************************************************************************
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Author: Mattias Gaertner
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Abstract:
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Demonstrating, how to add a method Assign to a class.
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}
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program AddMethodAssign;
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{$mode objfpc}{$H+}
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uses
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Classes, SysUtils, CodeCache, CodeToolManager, FileProcs, AVL_Tree,
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BasicCodeTools, SourceChanger, CodeTree, AssignExample1;
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var
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Filename: string;
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Code: TCodeBuffer;
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Tool: TCodeTool;
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AssignDeclNode: TCodeTreeNode;
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MemberNodeExts: TAVLTree;
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AssignBodyNode: TCodeTreeNode;
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AVLNode: TAVLTreeNode;
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NodeExt: TCodeTreeNodeExtension;
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NextAVLNode: TAVLTreeNode;
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ClassNode: TCodeTreeNode;
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AncestorClassNode: TCodeTreeNode;
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begin
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// load the file
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Filename:=ExpandFileName(SetDirSeparators('scanexamples/assignexample1.pas'));
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Code:=CodeToolBoss.LoadFile(Filename,false,false);
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if Code=nil then
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raise Exception.Create('loading failed '+Filename);
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// parse the unit, check if in a class with an Assign method
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try
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MemberNodeExts:=nil;
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if not CodeToolBoss.FindAssignMethod(Code,3,18,Tool,
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ClassNode,AncestorClassNode,
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AssignDeclNode,MemberNodeExts,AssignBodyNode) then
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raise Exception.Create('parser error');
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debugln(['Assign declaration found: ',AssignDeclNode<>nil]);
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debugln(['Assign body found: ',AssignBodyNode<>nil]);
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// remove nodes which are written by a property
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if MemberNodeExts<>nil then begin
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AVLNode:=MemberNodeExts.FindLowest;
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while AVLNode<>nil do begin
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NextAVLNode:=MemberNodeExts.FindSuccessor(AVLNode);
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NodeExt:=TCodeTreeNodeExtension(AVLNode.Data);
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if NodeExt.Data<>nil then begin
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debugln(['skipping identifier ',NodeExt.Txt,' because it is written by a property']);
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MemberNodeExts.FreeAndDelete(AVLNode);
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end else begin
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debugln('assigning identifier ',NodeExt.Txt,' ...');
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end;
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AVLNode:=NextAVLNode;
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end;
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end;
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if (MemberNodeExts=nil) or (MemberNodeExts.Count=0) then begin
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debugln('no assignable members found');
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exit;
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end;
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//
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if AssignDeclNode=nil then begin
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if not Tool.AddAssignMethod(MemberNodeExts,'Assign','Source','TObject',
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true,false,
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CodeToolBoss.SourceChangeCache)
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then
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raise Exception.Create('AddAssignMethod failed');
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end else begin
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debugln(['there is already an Assign method']);
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end;
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finally
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DisposeAVLTree(MemberNodeExts);
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end;
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// write the new source:
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writeln('-----------------------------------');
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writeln('New source:');
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writeln(Code.Source);
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writeln('-----------------------------------');
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end.
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