Class MatcherSet

An AbstractMatcher that combines other matchers.

Forwards rows to a group of child matchers. Allows matchers to be grouped together, e.g. into an AbstractScheme. This is also useful when using the OneOnlyMatcherSet:

const set = new OneOnlyMatcherSet([
  new MatcherSet([
    // named musical rows
  ]),
  new MatcherSet([
    // runs off the front
    // runs off the back
  ]),
]);
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The MatcherSet allows a row to match runs off both the front and the back despite use of the OneOnlyMatcherSet.