how to use backgroundTokenizer

[ArunPatal]

Hello,

I want to observer few lines. Example => line 4, 5 & 6

some code
line4: <start>
line5: Some Code
line6: </end>
some code

Now the code i am using is

var tokenizer = ace.require("ace/tokenizer").Tokenizer;
var backgroundTokenizer = ace.require("ace/background_tokenizer").BackgroundTokenizer;
var background = new backgroundTokenizer(new tokenizer(), editor);

Now i am confused how to use it to observer tokens at line 4,5 & 6
Please provide a sample code showing how is it possible.

Thanks

[nightwing]

You can simply use editor.session.getTokens(4) and it will use the existing backgroundTokenizer to get the tokens on line 4

[ArunPatal]

Thanks,

I tested it.

I stored it like
var line4 = editor.session.getTokens(4);
Later calling line4 show only those tokens which was stored at start..

Now what if row changes, how do i get new row of those tokens?

Also is there any event which tells if line got deleted or text changed?