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{
***************************************************************************
* *
* This source is free software; you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation; either version 2 of the License, or *
* (at your option) any later version. *
* *
* This code 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 *
* General Public License for more details. *
* *
* A copy of the GNU General Public License is available on the World *
* Wide Web at <http://www.gnu.org/copyleft/gpl.html>. You can also *
* obtain it by writing to the Free Software Foundation, *
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
* *
***************************************************************************
Author: Mattias Gaertner
Abstract:
Demonstrating, how to add a method Assign to a class.
}
program AddMethodAssign;
{$mode objfpc}{$H+}
uses
Classes, SysUtils,
// LazUtils
Laz_AVL_Tree,
// CodeTools
CodeCache, CodeToolManager, FileProcs,
BasicCodeTools, CodeTree, FindDeclarationTool, AssignExample1;
const
ConfigFilename = 'codetools.config';
var
Filename: string;
Code: TCodeBuffer;
Tool: TCodeTool;
AssignDeclNode: TCodeTreeNode;
MemberNodeExts: TAVLTree;
AssignBodyNode: TCodeTreeNode;
AVLNode: TAVLTreeNode;
NodeExt: TCodeTreeNodeExtension;
NextAVLNode: TAVLTreeNode;
ClassNode: TCodeTreeNode;
InheritedDeclContext: TFindContext;
ParamName: String;
ParamType: String;
ParamNode: TCodeTreeNode;
InheritedIsTPersistent: boolean;
InheritedClassNode: TCodeTreeNode;
AssignMembers: TFPList;
NewPos: TCodeXYPosition;
NewTopline: integer;
i: Integer;
begin
CodeToolBoss.SimpleInit(ConfigFilename);
// load the file
Filename:=ExpandFileName(SetDirSeparators('scanexamples/assignexample1.pas'));
Code:=CodeToolBoss.LoadFile(Filename,false,false);
if Code=nil then
raise Exception.Create('loading failed '+Filename);
// parse the unit, check if in a class with an Assign method
AssignMembers:=TFPList.Create;
try
MemberNodeExts:=nil;
if not CodeToolBoss.FindAssignMethod(Code,3,18,
Tool,ClassNode,AssignDeclNode,MemberNodeExts,AssignBodyNode,
InheritedDeclContext) then
raise Exception.Create('parser error');
debugln(['Assign declaration found: ',AssignDeclNode<>nil]);
debugln(['Assign body found: ',AssignBodyNode<>nil]);
debugln(['Inherited Assign found: ',InheritedDeclContext.Node<>nil]);
// remove nodes which are written by a property
if MemberNodeExts<>nil then begin
AVLNode:=MemberNodeExts.FindLowest;
while AVLNode<>nil do begin
NextAVLNode:=MemberNodeExts.FindSuccessor(AVLNode);
NodeExt:=TCodeTreeNodeExtension(AVLNode.Data);
if NodeExt.Data<>nil then begin
debugln(['skipping identifier ',NodeExt.Txt,' because it is written by a property']);
end else begin
debugln('assigning identifier ',NodeExt.Txt,' ...');
AssignMembers.Add(NodeExt);
MemberNodeExts.Delete(AVLNode);
end;
AVLNode:=NextAVLNode;
end;
end;
if (AssignMembers.Count=0) then begin
debugln('no assignable members found');
exit;
end;
ParamName:='Source';
ParamType:='TObject';
InheritedIsTPersistent:=false;
// check if inherited exists, if it is TPersistent.Assign and use the
// inherited parameter name and type
if InheritedDeclContext.Node<>nil then begin
InheritedClassNode:=InheritedDeclContext.Tool.FindClassOrInterfaceNode(InheritedDeclContext.Node);
InheritedIsTPersistent:=(InheritedClassNode<>nil)
and (InheritedClassNode.Parent.Desc=ctnTypeDefinition)
and (CompareIdentifiers('TPersistent',@InheritedDeclContext.Tool.Src[InheritedClassNode.Parent.StartPos])=0);
ParamNode:=InheritedDeclContext.Tool.GetProcParamList(InheritedDeclContext.Node);
if ParamNode<>nil then begin
ParamNode:=ParamNode.FirstChild;
if ParamNode<>nil then begin
ParamName:=InheritedDeclContext.Tool.ExtractDefinitionName(ParamNode);
if (ParamNode.FirstChild<>nil) and (ParamNode.FirstChild.Desc=ctnIdentifier) then
ParamType:=GetIdentifier(@InheritedDeclContext.Tool.Src[ParamNode.FirstChild.StartPos]);
end;
end;
end;
// add assign method
if AssignDeclNode=nil then begin
if not Tool.AddAssignMethod(ClassNode,AssignMembers,
'Assign',ParamName,ParamType,
InheritedDeclContext.Node<>nil,true,InheritedIsTPersistent,
CodeToolBoss.SourceChangeCache,NewPos,NewTopline)
then
raise Exception.Create('AddAssignMethod failed');
end else begin
debugln(['there is already an Assign method']);
end;
finally
DisposeAVLTree(MemberNodeExts);
for i:=0 to AssignMembers.Count-1 do
TObject(AssignMembers[i]).Free;
FreeAndNil(AssignMembers);
end;
// write the new source:
writeln('-----------------------------------');
writeln('New source:');
writeln(Code.Source);
writeln('-----------------------------------');
end.
|
