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https://gitlab.com/freepascal.org/lazarus/lazarus.git
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93 lines
3.6 KiB
ObjectPascal
93 lines
3.6 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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Simple demonstrating, how to add a method to a class.
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}
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program AddMethod;
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{$mode objfpc}{$H+}
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uses
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Classes, SysUtils, CodeCache, CodeToolManager, SimpleUnit1, FileProcs,
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CodeCompletionTool;
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type
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TMyMethodType = function(Sender: TObject; AValue: integer): string of object;
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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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AClassName: String;
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MethodName: String;
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MethodDefinition: String;
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CleanMethodDefinition: String;
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i: Integer;
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begin
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// Example: find declaration of 'TObject'
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// load the file
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Filename:=AppendPathDelim(GetCurrentDir)+'scanexamples'+PathDelim
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+'simpleunit1.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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// Example 1: add a method compatible to TMyMethodType
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if CodeToolBoss.CreatePublishedMethod(Code,'TMyClass','NewMethod',
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typeinfo(TMyMethodType),true) then
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begin
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writeln('Method added: ');
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writeln(Code.Source);
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end else begin
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raise Exception.Create('Adding method failed');
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end;
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// Example 2: adding methods directly, but several at a time
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AClassName:='TMyClass';
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if not CodeToolBoss.InitClassCompletion(Code,UpperCase(AClassName),Tool) then
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raise Exception.Create('Explore failed');
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for i:=1 to 3 do begin
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MethodName:='NewProc'+IntToStr(i);
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MethodDefinition:='procedure '+MethodName
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+'(Sender:TObject; AValue:integer);';
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// check, to not add an already existing method.
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// Create a search mask: only method names, parameter types and semicolon.
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// no class name, no 'procedure' keyword, no comments, no defaults,
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// no unneeded spaces, no result type, no parameter names, uppercase,
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// no modifiers (e.g. virtual)
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CleanMethodDefinition:=UpperCase(MethodName+'(:TObject;:integer);');
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if not Tool.ProcExistsInCodeCompleteClass(CleanMethodDefinition) then
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Tool.AddClassInsertion(CleanMethodDefinition, MethodDefinition, MethodName,
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ncpPublishedProcs);
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end;
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if not Tool.ApplyClassCompletion(true) then
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raise Exception.Create('Explore failed');
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writeln('Method added: ');
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writeln(Code.Source);
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end.
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