@solana/web3.js
Version:
Solana Javascript API
35 lines (32 loc) • 959 B
text/typescript
const END_OF_BUFFER_ERROR_MESSAGE = 'Reached end of buffer unexpectedly';
/**
* Delegates to `Array#shift`, but throws if the array is zero-length.
*/
export function guardedShift<T>(byteArray: T[]): T {
if (byteArray.length === 0) {
throw new Error(END_OF_BUFFER_ERROR_MESSAGE);
}
return byteArray.shift() as T;
}
/**
* Delegates to `Array#splice`, but throws if the section being spliced out extends past the end of
* the array.
*/
export function guardedSplice<T>(
byteArray: T[],
...args:
| [start: number, deleteCount?: number]
| [start: number, deleteCount: number, ...items: T[]]
): T[] {
const [start] = args;
if (
args.length === 2 // Implies that `deleteCount` was supplied
? start + (args[1] ?? 0) > byteArray.length
: start >= byteArray.length
) {
throw new Error(END_OF_BUFFER_ERROR_MESSAGE);
}
return byteArray.splice(
...(args as Parameters<typeof Array.prototype.splice>),
);
}