feat: implement clone function

Author: boblat

examples/marketplace/contract.algo.ts

@@ -1,5 +1,5 @@
 import type { Asset, gtxn, uint64 } from '@algorandfoundation/algorand-typescript'
-import { arc4, assert, BoxMap, Global, itxn, op, Txn } from '@algorandfoundation/algorand-typescript'
+import { arc4, assert, BoxMap, clone, Global, itxn, op, Txn } from '@algorandfoundation/algorand-typescript'
 
 export class ListingKey extends arc4.Struct<{
   owner: arc4.Address
@@ -111,7 +111,7 @@ export default class DigitalMarketplace extends arc4.Contract {
     assert(xfer.assetReceiver === Global.currentApplicationAddress)
     assert(xfer.assetAmount > 0)
 
-    const existing = this.listings(key).value.copy()
+    const existing = clone(this.listings(key).value)
     this.listings(key).value = new ListingValue({
       bid: existing.bid,
       bidUnitaryPrice: existing.bidUnitaryPrice,
@@ -129,7 +129,7 @@ export default class DigitalMarketplace extends arc4.Contract {
       nonce: nonce,
     })
 
-    const existing = this.listings(key).value.copy()
+    const existing = clone(this.listings(key).value)
     this.listings(key).value = new ListingValue({
       bid: existing.bid,
       bidUnitaryPrice: existing.bidUnitaryPrice,
@@ -147,7 +147,7 @@ export default class DigitalMarketplace extends arc4.Contract {
       nonce: nonce,
     })
 
-    const listing = this.listings(key).value.copy()
+    const listing = clone(this.listings(key).value)
 
     const amountToBePaid = this.quantityPrice(quantity, listing.unitaryPrice.native, asset.decimals)
 
@@ -180,7 +180,7 @@ export default class DigitalMarketplace extends arc4.Contract {
       nonce: nonce,
     })
 
-    const listing = this.listings(key).value.copy()
+    const listing = clone(this.listings(key).value)
     if (listing.bidder !== new arc4.Address()) {
       const currentBidDeposit = this.quantityPrice(listing.bid.native, listing.bidUnitaryPrice.native, asset.decimals)
       itxn.payment({ receiver: listing.bidder.native, amount: currentBidDeposit }).submit()
@@ -203,7 +203,7 @@ export default class DigitalMarketplace extends arc4.Contract {
   bid(owner: arc4.Address, asset: Asset, nonce: arc4.UintN64, bidPay: gtxn.PaymentTxn, quantity: arc4.UintN64, unitaryPrice: arc4.UintN64) {
     const key = new ListingKey({ owner, asset: new arc4.UintN64(asset.id), nonce })
 
-    const listing = this.listings(key).value.copy()
+    const listing = clone(this.listings(key).value)
     if (listing.bidder !== new arc4.Address()) {
       assert(unitaryPrice.native > listing.bidUnitaryPrice.native)
 
@@ -231,7 +231,7 @@ export default class DigitalMarketplace extends arc4.Contract {
   acceptBid(asset: Asset, nonce: arc4.UintN64) {
     const key = new ListingKey({ owner: new arc4.Address(Txn.sender), asset: new arc4.UintN64(asset.id), nonce })
 
-    const listing = this.listings(key).value.copy()
+    const listing = clone(this.listings(key).value)
     assert(listing.bidder !== new arc4.Address())
 
     const minQuantity = listing.deposited.native < listing.bid.native ? listing.deposited.native : listing.bid.native

examples/voting/contract.algo.ts

@@ -7,6 +7,7 @@ import {
   BoxMap,
   BoxRef,
   Bytes,
+  clone,
   ensureBudget,
   Global,
   GlobalState,
@@ -207,7 +208,7 @@ export class VotingRoundApp extends arc4.Contract {
       assert(answerOptionIndex < optionsCount, 'Answer option index invalid')
       this.incrementVoteInBox(cumulativeOffset + answerOptionIndex)
       cumulativeOffset += optionsCount
-      this.votesByAccount(Txn.sender).value = answerIds.copy()
+      this.votesByAccount(Txn.sender).value = clone(answerIds)
       this.voterCount.value += 1
     }
   }
@@ -228,7 +229,7 @@ export class VotingRoundApp extends arc4.Contract {
     for (const item of optionCounts) {
       totalOptions += item.native
     }
-    this.optionCounts.value = optionCounts.copy()
+    this.optionCounts.value = clone(optionCounts)
     this.totalOptions.value = totalOptions
   }
 

examples/zk-whitelist/contract.algo.ts

@@ -6,6 +6,7 @@ import {
   assert,
   BigUint,
   Bytes,
+  clone,
   ensureBudget,
   Global,
   GlobalState,
@@ -88,7 +89,7 @@ export default class ZkWhitelistContract extends arc4.Contract {
       .applicationCall({
         appId: appId,
         fee: 0,
-        appArgs: [arc4.methodSelector('verify(byte[32][],byte[32][])bool'), proof.copy(), publicInputs.copy()],
+        appArgs: [arc4.methodSelector('verify(byte[32][],byte[32][])bool'), clone(proof), clone(publicInputs)],
         onCompletion: OnCompleteAction.NoOp,
       })
       .submit().lastLog

src/impl/clone.ts

@@ -0,0 +1,11 @@
+import { getEncoder, toBytes } from './encoded-types'
+
+export function cloneImpl<T>(typeInfoString: string, value: T): T {
+  if (value && typeof value === 'object' && 'copy' in value && typeof value.copy === 'function') {
+    return value.copy() as T
+  }
+  const bytes = toBytes(value)
+  const typeInfo = JSON.parse(typeInfoString)
+  const encoder = getEncoder(typeInfo)
+  return encoder(bytes, typeInfo) as T
+}