[7.8] Simplest way to create code highlighter

Am Samstag, 4. Februar 2012 um 17:37 schrieb Carl Gundel:

I'm thinking to create a simple highlighting parser for BASIC from the

existing mechanism in VisualWorks. I am not thinking to hook this

into my BASIC parser. I only need to detect certain kinds of tokens

such as keywords, valid variable names, numeric and string literals,

etc. and give each kind its own color. I do this already in VSE for

Liberty BASIC and it is sufficient for my purposes. What would be the

minimal approach to implementing this in VW?

Thanks for any suggestions.

-Carl Gundel

http://www.libertybasic.com

http://www.runbasic.com

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Am Montag, 6. Februar 2012 um 22:49 schrieb Carl Gundel:

That was easy thanks, but for some reason my highlighted Text object

only appears as highlighted if I view it in an inspector. It doesn't

highlight where I am typing the code in. I'm not copying it, and I'm

returning the same instance from the highlight: method.

Any ideas? Do I need to set some flag or use a special subclass of something?

-Carl

On Mon, Feb 6, 2012 at 8:59 AM, Karsten Kusche <[hidden email]> wrote:

Hi Carl,

i just did a similar thing two weeks ago and it's actually quite easy.

here's what you need to do:

create a subclass of UI.Highlighter. Then you need to add that to the

texteditorcontroller you like to have highlighting on. To do so you add that

to your postBuildWith:

sourceController := (aBuilder componentAt:#sourceEditor) widget controller.

sourceController addHighlighter: YourHighlighter new.

In YourHighlighter you need to implement: #highlight: which gets a Text

passed. You need to return a Text in that method and that text will be

displayed.

How you parse the text is up to you. I've used the Scanner and just kept

scanning for tokens until everything was parsed. While doing that i kept

asking the scanner for the token, the tokenType and the mark. But I guess

you already have your own parser for Basic that provides a different

interface than the Smalltalk Scanner.

To add a certain style to the Text,

call: #addEmphasis:removeEmphasis:allowDuplicates:from:to:

The styles that you can use can all be found when

inspecting: StyleDescription codeNames.

So you could for example emphasise a keyword using:

resultText

addEmphasis: #code_keywordMessageSend

removeEmphasis: nil

allowDuplicates: true

from: start

to: end

Kind Regards

Karsten

--

Karsten Kusche - Dipl. Inf. - [hidden email]

Georg Heeg eK - Köthen

Handelsregister: Amtsgericht Dortmund A 12812

Am Samstag, 4. Februar 2012 um 17:37 schrieb Carl Gundel:

I'm thinking to create a simple highlighting parser for BASIC from the

existing mechanism in VisualWorks. I am not thinking to hook this

into my BASIC parser. I only need to detect certain kinds of tokens

such as keywords, valid variable names, numeric and string literals,

etc. and give each kind its own color. I do this already in VSE for

Liberty BASIC and it is sufficient for my purposes. What would be the

minimal approach to implementing this in VW?

Thanks for any suggestions.

-Carl Gundel

http://www.libertybasic.com

http://www.runbasic.com

_______________________________________________

vwnc mailing list

[hidden email]

http://lists.cs.uiuc.edu/mailman/listinfo/vwnc

Hi Carl,

not sure what's wrong there. I've published the package HighlightingExample to the public store where you can see who i implemented it. It's really just what i wrote in the previous mail, but maybe it helps you understanding where the error is.

Kind Regards

Karsten

-- 

Karsten Kusche - Dipl. Inf. - [hidden email]

Georg Heeg eK - Köthen

Handelsregister: Amtsgericht Dortmund A 12812 

Am Montag, 6. Februar 2012 um 22:49 schrieb Carl Gundel:

That was easy thanks, but for some reason my highlighted Text object

only appears as highlighted if I view it in an inspector. It doesn't

highlight where I am typing the code in. I'm not copying it, and I'm

returning the same instance from the highlight: method.

Any ideas? Do I need to set some flag or use a special subclass of something?

-Carl

On Mon, Feb 6, 2012 at 8:59 AM, Karsten Kusche <[hidden email]> wrote:

Hi Carl,

i just did a similar thing two weeks ago and it's actually quite easy.

here's what you need to do:

create a subclass of UI.Highlighter. Then you need to add that to the

texteditorcontroller you like to have highlighting on. To do so you add that

to your postBuildWith:

sourceController := (aBuilder componentAt:#sourceEditor) widget controller.

sourceController addHighlighter: YourHighlighter new.

In YourHighlighter you need to implement: #highlight: which gets a Text

passed. You need to return a Text in that method and that text will be

displayed.

How you parse the text is up to you. I've used the Scanner and just kept

scanning for tokens until everything was parsed. While doing that i kept

asking the scanner for the token, the tokenType and the mark. But I guess

you already have your own parser for Basic that provides a different

interface than the Smalltalk Scanner.

To add a certain style to the Text,

call: #addEmphasis:removeEmphasis:allowDuplicates:from:to:

The styles that you can use can all be found when

inspecting: StyleDescription codeNames.

So you could for example emphasise a keyword using:

resultText

addEmphasis: #code_keywordMessageSend

removeEmphasis: nil

allowDuplicates: true

from: start

to: end

Kind Regards

Karsten

--

Karsten Kusche - Dipl. Inf. - [hidden email]

Georg Heeg eK - Köthen

Handelsregister: Amtsgericht Dortmund A 12812

Am Samstag, 4. Februar 2012 um 17:37 schrieb Carl Gundel:

I'm thinking to create a simple highlighting parser for BASIC from the

existing mechanism in VisualWorks. I am not thinking to hook this

into my BASIC parser. I only need to detect certain kinds of tokens

such as keywords, valid variable names, numeric and string literals,

etc. and give each kind its own color. I do this already in VSE for

Liberty BASIC and it is sufficient for my purposes. What would be the

minimal approach to implementing this in VW?

Thanks for any suggestions.

-Carl Gundel

http://www.libertybasic.com

http://www.runbasic.com

_______________________________________________

vwnc mailing list

[hidden email]

http://lists.cs.uiuc.edu/mailman/listinfo/vwnc

_______________________________________________
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[hidden email]
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