Add more scopes to the tree-sitter grammar

Ben3eeE commented 6 years ago

Requirements

Filling out the template is required. Any pull request that does not include enough information to be reviewed in a timely manner may be closed at the maintainers' discretion.
All new code requires tests to ensure against regressions

Description of the Change

There were a couple of missing scope mappings that made the tree-sitter grammar not match the textmate grammar.

Scope block and method parameters to match the textmate grammar
Change the class of symbol to match the textmate grammar
Scope inherited classes differently from classes to match the textmate grammar

Alternate Designs

N/A

Benefits

Matches the textmate grammar more closely

Verification process

I used the following ruby file to test these new scope mappings

class OrderItem < ApplicationRecord

end

imablock do |param1, param2|
  OrderItem
end

def imablock(param1, param2)
end

def predicate?(date: start_on)
  do_a_thing
end

{key: CONSTANT, key2: 123, key3: false, key4: :symbol}