Generic class to abstract token numbering.
import { IndexPointer } from "metashrew-as/assembly/indexer/tables";
import { BSTU128 } from "metashrew-as/assembly/indexer/widebst";
import { u128 } from "as-bignum";
import { fromArrayBuffer } from "metashrew-runes/assembly/utils";
import { Source } from "as-rangesink/assembly";
export function _start(): void {
const runeId = new RuneId(840000, 12).toArrayBuffer();
const sourceOutpoint = IndexPointer.for("/example-source-outpoint").get();
const targetOutpoint = IndexPointer.for("/example-target-outpoint").get();
const amountSentToTrack = u128.from(100000);
const source = new Source<u128, BSTU128>(
BSTU128.at(IndexPointer.for("/rune/").select(runeId).keyword("/outpoint/byunit")),
IndexPointer.for("/rune/").select(runeId).keyword("/ranges/byoutpoint/").select(sourceOutpoint).getList().map((v: ArrayBuffer, i: i32, ary: Array<u128>) => fromArrayBuffer(v)),
fromArrayBuffer(IndexPointer.for("/rune/").select(runeId).keyword("/totalsupply").get())
);
source.pull();
const excess = source.pipeTo(IndexPointer.for("/rune/").select(runeId).keyword("/ranges/byoutpoint/"), targetOutpoint, amountSentToTrack);
// surplus after transfer amount is exhausted, is 0 if source is exhausted first, and source.index source.offset are updated to indicate position in remaining ranges
}flex