Making an IDE using Pascal Script and SynEdit - delphi

Question

I'm creating a built-in script engine using PascalScript from RemObjects (excellent) and the SynEdit editor. It's almost finished using the IDE example shipped with PascalScript and the IDE example in SynEdit - but - I can't see how to ask PascalScript whether a numbered source line is 'executable' or not. (I can then use this to mark the SynEdit gutter with the 'Delphi blue dot'). I guess I might have to do a dissassembly of the ROPS output?
Any PascalScript experts here? THanks. Brian.

Answer 1

Have a look at the source code of Inno Setup. It does show a small dot in the SynEdit gutter area for lines with executable code, gray ones for lines that are executable but have not been executed, green ones for lines that have been hit at least once.
The code for this can be found in CompForm.pas, look for the TLineState type. The information is set up in the iscbNotifySuccess state of the compiler callback, you could do the same in your IDE. You may need to adapt the code to handle multiple source files, as the Inno Setup compiler deals with code snippets in the single source file only.
In the Pascal Script sources you should have a look at the TPSCustomDebugExec.TranslatePositionEx() method - it does return the name of the source file as well.

Answer 2

I don't know exactly how it does it, but the IDE project in the PascalScript package (found under \samples\debug ) is able to offer Step Into and Step Over (F7 and F8) functionality, so logically it has to have some way of associating PS bytecode with lines of script code. Try examining that project to see how it does it. As a bonus, it uses SynEdit too, so the ideas will be easy to adapt to your own system.

Answer 3

I know this is an old question but I have been doing the same thing myself and the suggestions above do not really help. Inno setup for instance does not use Synedit, it uses scintilla editor.
Also the TPSCustomDebugExec.TranslatePositionEx() does the opposite to what is wanted, it gives a source line number from a runtime code position.
After faffing around for some time I came to the conclusion that the easiest way was to add a function to the Pascalscript code.
the new method is added to the TPSCustomDebugExec class in the uPSdebugger unit.
function TPSCustomDebugExec.HasCode(Filename:string; LineNo:integer):boolean;
var i,j:integer; fi:PFunctionInfo; pt:TIfList; r:PPositionData;
begin
result:=false;
for i := 0 to FDebugDataForProcs.Count -1 do
begin
fi := FDebugDataForProcs[i];
pt := fi^.FPositionTable;
for j := 0 to pt.Count -1 do
begin
r:=pt[j];
result:= SameText(r^.FileName,Filename) and (r^.Row=LineNo);
if result then exit
end;
end;
end;
and the paint gutter callback in the main editor form is as below
procedure Teditor.PaintGutterGlyphs(ACanvas:TCanvas; AClip:TRect;
FirstLine, LastLine: integer);
var a,b:boolean; LH,LH2,X,Y,ImgIndex:integer;
begin
begin
FirstLine := Ed.RowToLine(FirstLine);
LastLine := Ed.RowToLine(LastLine);
X := 14;
LH := Ed.LineHeight;
LH2:=(LH-imglGutterGlyphs.Height) div 2;
while FirstLine <= LastLine do
begin
Y := LH2+LH*(Ed.LineToRow(FirstLine)-Ed.TopLine);
a:= ce.HasBreakPoint(ce.MainFileName,FirstLine);
b:= ce.Exec.HasCode(ce.MainFileName,FirstLine);
if Factiveline=FirstLine then
begin
if a then
ImgIndex := 2 //Blue arrow+red dot (breakpoint and execution point)
else
ImgIndex := 1; //Blue arrow (current line execution point)
end
else
if b then
begin
if a then
ImgIndex := 3 //Valid Breakpoint marker
else
ImgIndex := 0; //blue dot (has code)
end
else
begin
if a then
ImgIndex := 4 //Invalid breakpoint (No code on this line)
else
ImgIndex := -1; //Empty (No code for line)
end;
if ImgIndex >= 0 then
imglGutterGlyphs.Draw(ACanvas, X,Y,ImgIndex);
Inc(FirstLine);
end;
end;
end;
The Synedit with Line numbers, code dots, breakpoints, bookmarks and execution point look as in the image below