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/FormatTextEntity.js

@@ -1,6 +1,8 @@
+import Grammar from "../serialization/Grammar.js"
 import IEntity from "./IEntity.js"
 import InvariantTextEntity from "./InvariantTextEntity.js"
 import LocalizedTextEntity from "./LocalizedTextEntity.js"
+import Parsimmon from "parsimmon"
 import Union from "./Union.js"
 
 export default class FormatTextEntity extends IEntity {
@@ -13,10 +15,30 @@ export default class FormatTextEntity extends IEntity {
             default: [],
         },
     }
-
     static {
         this.cleanupAttributes(this.attributes)
     }
+    static grammar = this.createGrammar()
+
+    static createGrammar() {
+        return Parsimmon.lazy(() =>
+            Parsimmon.seq(
+                Grammar.regexMap(
+                    // Resulting regex: /(LOCGEN_FORMAT_NAMED|LOCGEN_FORMAT_ORDERED)\s*/
+                    new RegExp(`(${this.lookbehind.values.reduce((acc, cur) => acc + "|" + cur)})\\s*`),
+                    result => result[1]
+                ),
+                Grammar.grammarFor(this.attributes.value)
+            )
+                .map(([lookbehind, values]) => {
+                    const result = new this({
+                        value: values,
+                    })
+                    result.lookbehind = lookbehind
+                    return result
+                })
+        )
+    }
 
     constructor(values) {
         super(values)