lsegal / yard / 1117

93%

master: 93%

Pull #1296

travis-ci

Support Ruby 2.7.0

Follow up of https://github.com/lsegal/yard/pull/1290#issuecomment-558204534.

This is a workaround path for Ruby 2.7.0.

`irb/slex` internal API has been removed in the following commits.
https://github.com/ruby/ruby/commit/45bb6f28d

This PR copies the above file to lib/yard/parser/ruby/legacy/irb/slex.rb.

Hopefully this workaround patch will be dropped along with legacy Ruby code
in the future.

And E2MM (e2mmap gem) is no longer bundled gems.
https://www.ruby-lang.org/en/news/2019/12/25/ruby-2-7-0-released/

```console
% cd path/to/repo/yard
% ruby -v
ruby 2.7.0p0 (2019-12-25 revision 647ee6f091) [x86_64-darwin17]
% bundle exec rake

(snip)

LoadError:
  cannot load such file -- e2mmap
  # ./lib/yard/parser/ruby/legacy/ruby_lex.rb:1:in `require'
  # ./lib/yard/parser/ruby/legacy/ruby_lex.rb:1:in `<top (required)>'
```

This dependency on `e2mmap` could be removed when `irb/slex` is removed
in the future.

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