What unicode unit does vim-lsc use in lsp ranges?

[Avi-D-coder]

Does this project use UTF-8, UTF-16, codepoint, or grapheme cluster indexes for lsp ranges?

If this project uses a unit other than UTF-16 could/would you ever conform to the protocol 3.0 and use UTF-16?

I am conducting a survey to inform the debate over what unit ranges should use in the Language Server Protocol.
The debate is occuring in issue #376.

[natebosch]

This project currently uses whatever strchars() uses (though there are probably also bugs). I'm pretty sure that is codepoints.

I do plan on conforming to spec to use UTF-16.

[Avi-D-coder]

@natebosch thanks

[andymass]

I think if vim-lsc were to become utf-16 conforming, where col('.') (byte position) is used would be replaced with something like;

" get column number measured in utf16 code units (a𐐀b -> [0, 1, 3])
function! Utf16col()
  if col('.') == 1
    return 0
  endif
  let str = getline('.')[:col('.')-2]   " chars prior to cursor
  return strlen(substitute(str, '.',
        \ '\=char2nr(submatch(0)) >= 0x10000 ? "XX" : "X"', 'g'))
endfunction

Not clear what to do at the moment since servers are inconsistent.