Modifies the `process` method of gr-diff-processor to traverse diff
content using an asynchronous recursive loop rather than a blocking
for-loop. The async version maintains the promise interface already
established.
Refactored to constrain side-effects to the `process` method. Whereas,
formerly, helper methods in gr-diff-processor both read and wrote the
component's internal state, they are rewritten to be more pure, making
them simpler to understand, test, and invoke asynchronously.
Documentation is added throughout as well as tests for helper functions.
Note that this change only makes the processing step asynchronous.
Upgrading the diff-rendering stage to be non-blocking will come in a
later change.
Change-Id: Ifd50eeb75797b173937890caacc92cad5675fc20
Moves the diff-processing functionality of the gr-diff-builder component
into a new gr-diff-processor component which exposes a promise-based
interface. This is step one of creating an asynchronous (non-blocking)
diff rendering system.
As much as possible, this change is a transfer of code (with tests) from
one component to another, making it easier to verify that functionality
has not changed. Cleanup of the code, and refactoring it into a
more-testable form will come with later changes.
Feature: Issue 3916
Change-Id: I875b03b20bf953b128cbe3c5001ba1f8eba12c61
