Rationalize StarlarkImportLookupValue.Key

This is refactoring work toward adding a new kind of .bzl loading context, for Bazel-internal .bzl files.

Work toward #11437.

StarlarkImportLookupValue:
- Split off bzl keys into subclasses depending on whether we're at package-loading time or workspace-eval time. This is more readable and avoids unused fields. This will grow a third subclass when we add support for @builtins .bzl loading. The isWorkspace bool becomes an instanceof check.
- Rename factory methods accordingly so it's always clear what we're retrieving.
- Add helper method to construct a key for loading another .bzl within the same evaluation context (i.e. package vs workspace).

StarlarkImportLookupFunction:
- Collapse the params for internal functions by passing the key instead of its fields.
- Rearrange workspaceChunk cases in getRepositoryMapping to better align with package vs workspace dichotomy.

RELNOTES: None
PiperOrigin-RevId: 312838319
9 files changed
tree: bea81bcf3bf55f0bd6b81a175955ee6858d19ab8
  1. .bazelci/
  2. .bazelrc
  3. .gitattributes
  4. .gitignore
  5. AUTHORS
  6. BUILD
  7. CHANGELOG.md
  8. CODEOWNERS
  9. CONTRIBUTING.md
  10. CONTRIBUTORS
  11. ISSUE_TEMPLATE.md
  12. LICENSE
  13. README.md
  14. WORKSPACE
  15. combine_distfiles.py
  16. combine_distfiles_to_tar.sh
  17. compile.sh
  18. distdir.bzl
  19. examples/
  20. scripts/
  21. site/
  22. src/
  23. third_party/
  24. tools/
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