Highlighting of variables and functions with fortran keywords as name

[plevold]

Functions or variables named the same as a fortran keyword is highlighted differently than other functions or arrays in some situations. I appreciate that this might be a quite challenging task, but it would be really nice if the syntax highlighting could identify if the token is actually a reserved keyword or if it's a variable or function with the same name.

Screenshots

Code sample

program main
    integer :: module
    integer :: if

    if = format()
    if (if == 1) then
        if (format() == 1) then
            module = 3
        end if
    end if

contains

    integer function format()
        format = 1
    end function
end program

To Reproduce
Paste code above

Fortran Form
Free form, but strictly speaking also fixed form

Build info (please complete the following information):

• OS: Windows 10
• Extension Version 2.6.2
• Visual Studio Code Version 1.65.1

[gnikit]

@plevold thanks for the bug report. I will have a look, but I think it might be challenging to tell these two apart without a considerable performance hit. I will check it out

[gnikit]

I had a look at this and I am afraid the normal syntax highlighting will not suffice to solve this. As far as I can tell there is no way to create a regex that will distinguish between a user defined format and the format statement. For that we will need to use the AST scopes, luckily the language server knows about scopes but I will have to implement a semantics token provider to allow this.

This looks like it's going to be a pretty big piece of work so I won't probably get around to it for quite some time.

[Divyansh200102]

@plevold is this issue still open?