ebnf: support raw string tokens as used by EBNF in the Go spec

The EBNF in the Go specification uses raw strings for tokens that
contain double quotes or backslashes. This change adds support
for raw string tokens to the ebnf package, so that go_spec.html
is validated successfully.

This change also re-enables the ebnflint test, which validates the
Go spec.

Fixes golang/go#37290

Change-Id: Idbcbecd1af1632c296a8f5f2ceceec20af288d32
GitHub-Last-Rev: 537e1f364d541293ca41369bb4efa623a2ae0b93
GitHub-Pull-Request: golang/exp#10
Reviewed-on: https://go-review.googlesource.com/c/exp/+/220017
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
3 files changed
tree: 74d6121bd7227e1bf23afc8d4cfa5cca41155575
  1. .gitattributes
  2. .gitignore
  3. AUTHORS
  4. CONTRIBUTING.md
  5. CONTRIBUTORS
  6. LICENSE
  7. PATENTS
  8. README.md
  9. apidiff/
  10. cmd/
  11. codereview.cfg
  12. ebnf/
  13. ebnflint/
  14. errors/
  15. fsnotify/
  16. go.mod
  17. go.sum
  18. inotify/
  19. io/
  20. mmap/
  21. rand/
  22. shiny/
  23. shootout/
  24. sumdb/
  25. utf8string/
  26. winfsnotify/
README.md

exp

This subrepository holds experimental and deprecated (in the old directory) packages.

The idea for this subrepository originated as the pkg/exp directory of the main repository, but its presence there made it unavailable to users of the binary downloads of the Go installation. The subrepository has therefore been created to make it possible to go get these packages.

Warning: Packages here are experimental and unreliable. Some may one day be promoted to the main repository or other subrepository, or they may be modified arbitrarily or even disappear altogether.

In short, code in this subrepository is not subject to the Go 1 compatibility promise. (No subrepo is, but the promise is even more likely to be violated by go.exp than the others.)

Caveat emptor.