Fast syntax highlighting in RTB

[Darthatron]

So, I'm making an assembler with a GUI in C#, and I've decided to just make a user control with some syntax highlighting. I'm not very imaginative with names, so I'm just calling it CodeTextBox. Chances are that I'll make it open source once it's done anyway, so I was wondering if anyone was willing to put some effort in to help make it a better control.

So far I've got syntax highlighting working pretty well, and there's no noticeable lag even with hundreds of lines of code. The way I did this was by only updating the syntax on the current line, rather than the entire RTB all at once.

I want it to be simple to change the highlighting that takes place, it currently uses something like this:

            txtMain.TheSyntax.ClearSyntax();
            txtMain.TheSyntax.AddSyntax(new string[] { ".org", ".word", ".hword", ".align", }, Color.Gray); //Directives
            txtMain.TheSyntax.AddSyntax(new string[] { "push", "pop", "mov", "movs", "ldr", "ldrb", "ldrh", "lsl", "lsr", "b", "bx", "bl", "blx", "bge", "beq", "blt", "cmp", "add", "sub" }, Color.Blue); //Keywords
            txtMain.TheSyntax.AddSyntax(new string[] { "r0", "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "lr", "sp", "pc" }, Color.DarkCyan); //Registers

Other syntax colors are set pretty easily as well:

            txtMain.TheSyntax.NumericColor = Color.DarkMagenta;
            txtMain.TheSyntax.HighlightNumbers = true;
            txtMain.TheSyntax.CommentColor = Color.DarkGreen;
            txtMain.TheSyntax.HighlightComments = false;
            txtMain.TheSyntax.StringColor = Color.DarkRed;
            txtMain.TheSyntax.HighlightStrings = false;

And of course you can set the size of the tab key, rather than sending an actual TAB character to the textbox.

            txtMain.TabSize = 4;

Currently the only thing not complete for Syntax Highlighting is comments, mainly because they are multi-line, so I'm trying to work out a way to make that work well. Ideas?

I'm not really having trouble with anything, but I think it could be a good community project if anyone else is bored. So, who's bored?

 

[Darthatron]

In fact, I'm just going to leave this here if anyone is interested in it.

 

[Aleul]

Hey man, I'll make some changes to this tonight after work\tomorrow morning, heading off to work here in a minute. I have a question though so I don't go changing things on you.

Is there any particular reason you're not inheriting from a RichTextBox, and that on the on change event calling a parser? It'd take out the need to call Win32 functions (well, maybe not entirely but I've only glance over the code atm).

Then by separating out the parser you can easily reuse it for things that aren't specifically this control

 

[Darthatron]

No real reason, really. I just felt it would be more open if I didn't inherit anything. But if you think it would be better, then fair enough. ^_^

I don't really use C# all that often, so I'm not surprised (and won't be offended) if my code is sloppy.

 

[iJava]

If you finish this then I may create a version for Java and we could perhaps provide them together on SF?

 

[dongchan]

If you finish this then I may create a version for Java and we could perhaps provide them together on SF?

can anyone tell me what's the mean of "SF"?

 

[Darthatron]

can anyone tell me what's the mean of "SF"?

SourceForge. It's a place where programmers supply open-source applications.

 

To make things a bit more flexible for the end-user you might want to manage syntax highlighting through XML like what AvalonEdit does

 

[Kyle_Undefined]

Couldn't you have the syntax highlighting for the whole document run in the background? It shouldn't be that hard to properly do it, no matter how many lines the file is.