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/InvariantTextEntity.js

@@ -1,4 +1,6 @@
+import Grammar from "../serialization/Grammar.js"
 import IEntity from "./IEntity.js"
+import Parsimmon from "parsimmon"
 
 export default class InvariantTextEntity extends IEntity {
 
@@ -9,10 +11,23 @@ export default class InvariantTextEntity extends IEntity {
             default: "",
         },
     }
-
     static {
         this.cleanupAttributes(this.attributes)
     }
+    static grammar = this.createGrammar()
+
+    static createGrammar() {
+        return Parsimmon.alt(
+            Parsimmon.seq(
+                Parsimmon.regex(new RegExp(`${this.lookbehind}\\s*\\(`)),
+                Grammar.grammarFor(this.attributes.value),
+                Parsimmon.regex(/\s*\)/)
+            )
+                .map(([_0, value, _2]) => value),
+            Parsimmon.regex(new RegExp(this.lookbehind)) // InvariantTextEntity can not have arguments
+                .map(() => "")
+        ).map(value => new this(value))
+    }
 
     constructor(values) {
         if (values.constructor !== Object) {