Add more scopes to the tree-sitter go grammar

[Ben3eeE]

TODO

• default in this program does not get parsed with an anonymous node and is not highlighted
• true and false is not highlighted. They are constant.language.go in textmate
• The % part of interpreted_string_literal is not highlighted differently. It's constant.other.placeholder.go in textmate:

fmt.Printf("Don't know type %T\n", t)

textmate:

tree-sitter:

• Test everything

Changes

• Scope go as keyword.control
• Scope imaginary_literal as constant.numeric.integer
• Scope float_literal as constant.numeric.float
• Scope all operators as keyword.operator

/cc: @maxbrunsfeld

[maxbrunsfeld]

I pushed an update to tree-sitter-go that addresses some issues:

• There should now be an anonymous default node, so default in switch statements should get colored.
• There are now separate true and false nodes

[maxbrunsfeld]

I would say we should probably merge this even without the % changes. I want to do something about those, but I'm not exactly sure what yet. They're a bit like the word TODO in a comment - something that's not really part of the language's syntax, so is maybe suitable for an injection. But like TODO, it seems like we need some lighter-weight kind of injection, which doesn't involve creating an entirely separate parser.

[Ben3eeE]

Nice, yeah it seems like we have this problem in other languages as well. The %. Like in Python {} is not highlighted in a string /cc: atom/language-python#281 (comment)