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- program sample1;
-
- uses
- ifpscomp,
- ifps3,
- ifps3lib_std,
- ifps3lib_stdr;
-
- function ScriptOnUses(Sender: TIFPSPascalCompiler; const Name: string): Boolean;
- { the OnUses callback function is called for each "uses" in the script.
- It's always called with the parameter 'SYSTEM' at the top of the script.
- For example: uses ii1, ii2;
- This will call this function 3 times. First with 'SYSTEM' then 'II1' and then 'II2'.
- }
- begin
- if Name = 'SYSTEM' then
- begin
- RegisterStandardLibrary_C(Sender);
- { Register the standard library. The standard library is in the
- ifps3lib_std.pas unit. This will register all standard functions like
- Copy, Pos, Length.
- }
- Result := True;
- end else
- Result := False;
- end;
-
- procedure ExecuteScript(const Script: string);
- var
- Compiler: TIFPSPascalCompiler;
- { TIFPSPascalCompiler is the compiler part of the scriptengine. This will
- translate a Pascal script into a compiled for the executer understands. }
- Exec: TIFPSExec;
- { TIFPSExec is the executer part of the scriptengine. It uses the output of
- the compiler to run a script. }
- Data: string;
- begin
- Compiler := TIFPSPascalCompiler.Create; // create an instance of the compiler.
- Compiler.OnUses := ScriptOnUses; // assign the OnUses event.
- if not Compiler.Compile(Script) then // Compile the Pascal script into bytecode.
- begin
- Compiler.Free;
- // You could raise an exception here.
- Exit;
- end;
-
- Compiler.GetOutput(Data); // Save the output of the compiler in the string Data.
- Compiler.Free; // After compiling the script, there is no need for the compiler anymore.
-
- Exec := TIFPSExec.Create; // Create an instance of the executer.
- RegisterStandardLibrary_R(Exec);
- { The functions registered at compile time also need to be registered at runtime. These
- functions can be found in the ifps3lib_stdr.pas unit. }
- if not Exec.LoadData(Data) then // Load the data from the Data string.
- begin
- { For some reason the script could not be loaded. This is usually the case when a
- library that has been used at compile time isn't registered at runtime. }
- Exec.Free;
- // You could raise an exception here.
- Exit;
- end;
-
- Exec.RunScript; // Run the script.
- Exec.Free; // Free the executer.
- end;
-
- const
- Script = 'var s: string; begin s := ''Test''; S := s + ''ing;''; end.';
-
- begin
- ExecuteScript(Script);
- end.
-