How to get treesitter parser based on filetype if parser name differs?

Tree-sitter
1

I am trying to get my c# parser by using vim.treesitter.get_parser. I can do this fine if I use lang="c_sharp", but not if I set lang="cs".

It’s hard to figure out how to retrieve this mapping dynamically. When looking at the documentation it seems like it should be using filetype, and not parser name:

Lua module: vim.treesitter                               *lua-treesitter-core*


get_parser({bufnr}, {lang}, {opts})                             *get_parser()*
                Gets the parser for this bufnr / ft combination.

                If needed this will create the parser. Unconditionally attach
                the provided callback

                Parameters: 
                    {bufnr}  The buffer the parser should be tied to
                    {lang}   The filetype of this parser
                    {opts}   Options object to pass to the created language
                             tree

                Return: 
                    The parser

Especially when looking at the short description it is even more misguiding:

    parser = vim.treesitter.get_parser(bufnr, lang)

 `bufnr=0` can be used for current buffer. `lang` will default to 'filetype'.
Currently, the parser will be retained for the lifetime of a buffer but this
is subject to change. A plugin should keep a reference to the parser object as
long as it wants incremental updates.

as filetype refers to the actual file type, i. e. cs in my case.

2

It’s available in the filetype_to_parsername table in nvim-treesitter:

print(require("nvim-treesitter.parsers").filetype_to_parsername["cs"])
1 Like
3

Thanks. Sorry for the late reply, this post got hidden and I found a solution in the meantime.

Actually, a slightly different solution, as there seems to be a method in addition to the field you refer:

require("nvim-treesitter.parsers").ft_to_lang("cs")

Seen in action here: Adds generic mapping of filetype to ts parser name by MikaelElkiaer · Pull Request #89 · danymat/neogen · GitHub

1 Like