Folding at keywords and whitespace

[neilsf]

Hi
Disclaimer: I am not a Lua programmer.
I'm trying to write a custom lexer for a BASIC dialect that allows code blocks like this:

SUB something
    ...
END SUB

Now if I define the keywords "SUB" and "END" then syntax highlighting works fine, however I can't find a way to define folding.
I tried this:

lex:add_fold_point(lexer.KEYWORD, 'sub', 'end sub')

It doesn't work, I think because "end sub" is not a keyword. I also tried:

lex:add_fold_point(lexer.KEYWORD, 'sub', 'end')

It doesn't work either, I think becuase there is text content after "end".

I also tried to add keywords containing a space like this:

lex:add_rule('keyword', token(lexer.KEYWORD, lexer.word_match({'sub', 'end sub'}, true)))

This also doesn't work, it gives an error message when launching Textadept.

/home/neils/Programs/textadept_10.8.x86_64/lexers/lexer.lua:1760: bad argument #1 to 'lpeg_S' (string expected, got boolean)

Can you give me ideas on how it could be written? Thanks

[orbitalquark]

Did you try lex:add_fold_point(lexer.KEYWORD, 'SUB', 'END') Lexers are case-sensitive. If your keywords are for 'SUB' and 'END', then the fold point should use the same case. The error you are getting in that last example is due to the fact that that API is valid for 11.x, but not 10.8.

[neilsf]

Did you try lex:add_fold_point(lexer.KEYWORD, 'SUB', 'END')

I did but it only works if END is the only keyword in that line. It doesn't work for END SUB or END FUNCTION etc...

The error you are getting in that last example is due to the fact that that API is valid for 11.x, but not 10.8.

Got that, I have upgraded to the latest version, thanks.

[orbitalquark]

Oh, I see. 'End Sub' is broken up into two parts: 'End', which is a fold end point, but the very next 'Sub' starts a new fold point. Other than writing your own fold function, this is not possible right now. I'll have to look into this.

[neilsf]

Oh yeah, I see, great explanation, thanks.
I'll try to write a custom fold function, it's time to learn Lua anyway :-)

[orbitalquark]

This should be fixed via orbitalquark/scintillua@83b52b0 in the Scintillua project (Textadept uses it for syntax highlighting). These changes should be in the next nightly build of Textadept.

[neilsf]

It works nicely in latest nightly, many thanks.