import, using, export rules (from tree-sitter) are clumsy

[o314]

Nota: this is a repost of https://github.com/lezer-parser/julia/issues/4

the tree-sitter grammar offer a very partial implementation of the import/export rules. in particular

• selected and scoped (tree-sitter lingo) are exclusive
• aliasing is not supported
• interpolation is not supported
• etc.

Here is an update targeting Julia v1.6

# for julia v1.6
import_family ::=
    "import" _imex_bypath ("," _imex_bypath)*
  | "import" _imex_path ":" _imex_bypath ("," _imex_bypath)*
  | "using" _imex_path ("," _imex_path)*
  | "using" _imex_path ":" _imex_bypath ("," _imex_bypath)*
  .

export ::= _imex_path_elem ("," _imex_path_elem)* .

_imex_bypath ::= _imex_path ("as" _imex_path_elem)? .

_imex_path ::= _imex_path_dots _imex_path_elem ("." _imex_path_elem)* .

_imex_path_dots ::= "."* .

_imex_path_elem ::=
    id                                                      # std id
  | id string                                               # nonstd id
  | op                                                      # operator
  | "@" instance                                            # macro name
  | "$" expression                                          # interpolation
# | "(" expression ")"                                      # staging
    .

I write grammar in bnf format since i don't know the js lingo used there, sorry for the inconvenience
Is there any way to update the def file ?

REFS

• https://github.com/JuliaLang/julia/blob/v1.6.2/src/julia-parser.scm
• https://github.com/julia-vscode/CSTParser.jl/blob/v3.2.4/src/CSTParser.jl
• https://github.com/julia-vscode/CSTParser.jl/blob/v3.2.4/src/components/keywords.jl#L166-L199
• https://github.com/julia-vscode/CSTParser.jl/blob/v3.2.4/src/components/internals.jl#L381-L423
• https://docs.julialang.org/en/v1/devdocs/ast/
• module and import aliasing JuliaLang/julia#1255
• 2.0: just one import keyword JuliaLang/julia#39235 (loosely)