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/IEntity.js

@@ -1,5 +1,6 @@
 import ComputedType from "./ComputedType.js"
 import MirroredEntity from "./MirroredEntity.js"
+import Serializable from "../serialization/Serializable.js"
 import SerializerFactory from "../serialization/SerializerFactory.js"
 import Union from "./Union.js"
 import Utility from "../Utility.js"
@@ -42,7 +43,7 @@ import Utility from "../Utility.js"
  * }} TypeGetter
  */
 
-export default class IEntity {
+export default class IEntity extends Serializable {
 
     /** @type {String | Union<String[]>} */
     static lookbehind = ""
@@ -62,6 +63,7 @@ export default class IEntity {
     }
 
     constructor(values = {}, suppressWarns = false) {
+        super()
         /** @type {String} */ this.lookbehind
         const Self = /** @type {EntityConstructor} */(this.constructor)
         let attributes = Self.attributes
@@ -86,6 +88,9 @@ export default class IEntity {
         const valuesNames = Object.keys(values)
         const attributesNames = Object.keys(attributes)
         const allAttributesNames = Utility.mergeArrays(valuesNames, attributesNames)
+        if (valuesNames.includes("lookbehind")) {
+            this.lookbehind = undefined // To keep it first
+        }
         for (const attributeName of allAttributesNames) {
             if (attributeName == "attributes") {
                 continue
@@ -219,6 +224,11 @@ export default class IEntity {
         }
     }
 
+    /**
+     * @template {new (...args: any) => any} C
+     * @param {C} type
+     * @returns {value is InstanceType<C>}
+     */
     static isValueOfType(value, type) {
         return value != null && (value instanceof type || value.constructor === type)
     }