feat(ScaleSet): add ScaleSet

assembly/ScaleSet.ts

@@ -0,0 +1,79 @@
+import { CompactInt } from "./Int/CompactInt";
+import { BytesReader } from "./BytesReader";
+import { Codec } from "./interfaces/Codec";
+import { UnwrappableCodec } from "./interfaces/UnwrappableCodec";
+
+/**
+ * @description SCALE Codec support for native Set type
+ */
+export class ScaleSet<T extends Codec>
+    extends Set<T>
+    implements UnwrappableCodec<Set<T>> {
+    /**
+     * @description return underlying native type
+     */
+    @inline
+    unwrap(): Set<T> {
+        // TODO: remove unwrap?
+        return this;
+    }
+
+    /**
+     * The number of bytes this Set has
+     */
+    @inline
+    encodedLength(): i32 {
+        return this.toU8a().length;
+    }
+    /**
+     * Convert it to u8[]
+     * Length is encoded first, followed by all key and value encodings concatenated
+     */
+    toU8a(): u8[] {
+        const values: T[] = this.values();
+        let len: CompactInt = new CompactInt(values.length);
+        const result: Array<Array<u8>> = [len.toU8a()];
+        for (let i = 0; i < values.length; i++) {
+            result.push(values[i].toU8a());
+        }
+        return result.flat();
+    }
+
+    /**
+     * @description Non-static constructor
+     * @param bytes
+     * @param index
+     */
+    populateFromBytes(bytes: u8[], index: i32 = 0): i32 {
+        const bytesReader = new BytesReader(bytes, index);
+        const lenComp = bytesReader.readInto<CompactInt>();
+        for (let i: i32 = 0; i < lenComp.unwrap(); i++) {
+            const value = bytesReader.readInto<T>();
+            this.add(value);
+        }
+
+        return bytesReader.currentIndex();
+    }
+
+    @operator("==")
+    eq(other: this): bool {
+        return this === other;
+    }
+
+    @operator("!=")
+    notEq(other: this): bool {
+        return !this.eq(this);
+    }
+
+    static fromU8a<T extends Codec>(input: u8[], index: i32 = 0): ScaleSet<T> {
+        const set = new ScaleSet<T>();
+        const bytesReader = new BytesReader(input, index);
+        const len = bytesReader.readInto<CompactInt>().unwrap();
+
+        for (let i: i32 = 0; i < len; i++) {
+            const val = bytesReader.readInto<T>();
+            set.add(val);
+        }
+        return set;
+    }
+}