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depot_tools/metadata/tests
Jiewei Qian 79cfa048c0 metadata: early terminate certain fields to avoid over extraction
This CL adds a "early terminate the field based on field value" parser
mechanism to end the field as soon as the field value provides an
unambiguous answer to the question we care about.

This is to prevent over-extraction over certain fields (specifically,
local modifications) which can either be a definitive answer (e.g. No
modification) or multi-line free-form texts (which may contain unknown
fields that we don't care about at this stage).

This mitigates over extraction of README.chromium files like:

```
Local Modifications:
None

How to Uprev:
Steps...
```

Where the old parser would extract "None\n\nHow to Uprev:\nSteps..."

This CL also refactors single line fields to use the same early
termination mechanism since single line field simply ends as soon as
the line is parsed.

Union[Something, None] is changed to Optional[Something] based on
styleguide.

Bug: b/324149233
Change-Id: I3fca80eaceb071263f8ae8730afda230fff0bbb0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/5394917
Reviewed-by: Anne Redulla <aredulla@google.com>
Commit-Queue: Jiewei Qian <qjw@chromium.org>
1 year ago
..
data metadata: early terminate certain fields to avoid over extraction 1 year ago
dependency_metadata_test.py [ssci] Support alias for Shipped field 2 years ago
fields_test.py metadata: early terminate certain fields to avoid over extraction 1 year ago
parse_test.py metadata: early terminate certain fields to avoid over extraction 1 year ago
validate_test.py [ssci] Modify metadata versioning info validation 2 years ago