Split grammar (#15)

* Move grammar parsers to entity classes

* Fix includes

* Fix Entity5 test

* Small detail

* Fix unknown keys entities

* Persistent grammar objects

* Fix grammar

* Grammar from variable

js/entity/PinReferenceEntity.js

@@ -1,5 +1,6 @@
 import GuidEntity from "./GuidEntity.js"
 import IEntity from "./IEntity.js"
+import Parsimmon from "parsimmon"
 import PathSymbolEntity from "./PathSymbolEntity.js"
 
 export default class PinReferenceEntity extends IEntity {
@@ -13,10 +14,23 @@ export default class PinReferenceEntity extends IEntity {
             type: GuidEntity,
         },
     }
-
     static {
         this.cleanupAttributes(this.attributes)
     }
+    static grammar = this.createGrammar()
+
+    static createGrammar() {
+        return Parsimmon.seq(
+            PathSymbolEntity.createGrammar(),
+            Parsimmon.whitespace,
+            GuidEntity.createGrammar()
+        ).map(
+            ([objectName, _1, pinGuid]) => new this({
+                objectName: objectName,
+                pinGuid: pinGuid,
+            })
+        )
+    }
 
     constructor(values) {
         super(values)