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sample1.dpr
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2002-06-20
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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.