Adriane Boyd 960d9cfadc Officially support DependencyMatcher ...

Add official support for the `DependencyMatcher`. Redesign the pattern
specification. Fix and extend operator implementations. Update API docs
and add usage docs.

Patterns
--------

Refactor pattern structure to:

```
{
  "LEFT_ID": str,
  "REL_OP": str,
  "RIGHT_ID": str,
  "RIGHT_ATTRS": dict,
}
```

The first node contains only `RIGHT_ID` and `RIGHT_ATTRS` and all
subsequent nodes contain all four keys.

New operators
-------------

Because of the way patterns are constructed from left to right, it's
helpful to have `follows` operators along with `precedes` operators. Add
operators for simple precedes / follows alongside immediate precedes /
follows.

* `.*`: precedes
* `;`: immediately follows
* `;*`: follows

Operator fixes
--------------

* `<` and `<<` do not include the node itself
* Fix reversed order for all operators involving linear precedence (`.`,
  all sibling operators)
* Linear precedence operators do not match nodes outside the same parse

Additional fixes
----------------

* Use v3 Matcher API
* Support `get` and `remove`
* Support pickling

2020-09-02 17:45:29 +02:00

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