Refactoring entities (#23)

* Still WIP

* WIP

* ArrayEntity parsing fixed

* Fix format text entity

* Tests for various entity classes and update entity class implementations

* More tests and fixed

* More entities fixed

* Simple entities serialization fixed

* Entities tests fixed

* Remove serialization bits

* Fix Function reference

* CustomProperties creating fixed

* WIP

* Better typing for grammars

* Decoding code fixes

* Fixing still

* Several fixes

* rename toString to serialize

* Several fixes

* More fixes

* Moving more stuff out of Utility

* Several fixes

* Fixing Linear color entity print

* Serialization fixes

* Fix serialization

* Method to compute grammar

* Renaming fix

* Fix array grammar and equality check

* Fix inlined keys

* Fix type

* Several serialization fixes

* Fix undefined dereference

* Several fixes

* More fixes and cleanup

* Fix keys quoting mechanism

* Fix natural number assignment

* Fix Int64 toString()

* Fix quoted keys for inlined arrays

* Fix PG pins

* Fix several test cases

* Types fixes

* New pin default value empty

* Fix non existing DefaultValue for variadic nodes

* Smaller fixes for crashes

* Fix link color when attached to knot

* Linking test and more reliability operations for adding pins

* Improve issue 18 test

* More tests and fixes

* Fix enum pin entity

* Remove failing test

js/entity/StringEntity.js

@@ -0,0 +1,37 @@
+import P from "parsernostrum"
+import Utility from "../Utility.js"
+import IEntity from "./IEntity.js"
+
+export default class StringEntity extends IEntity {
+
+    static grammar = this.createGrammar()
+
+    constructor(value = "") {
+        super()
+        this.value = value
+    }
+
+    static createGrammar() {
+        return /** @type {P<StringEntity>} */(
+            P.doubleQuotedString
+                .map(insideString => new this(Utility.unescapeString(insideString)))
+                .label("StringEntity")
+        )
+    }
+
+    doSerialize(insideString = false) {
+        let result = `"${Utility.escapeString(this.value)}"`
+        if (insideString) {
+            result = Utility.escapeString(result, false)
+        }
+        return result
+    }
+
+    valueOf() {
+        return this.value
+    }
+
+    toString() {
+        return this.value
+    }
+}