// Copyright 2020 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

export const HEXADECIMAL_REGEXP = /^0x[a-fA-F0-9]+$/;
export const DECIMAL_REGEXP = /^0$|[1-9]\d*$/;


export function toHexString(data: {number: number, pad: number, prefix: boolean}): string {
  const hex = data.number.toString(16).padStart(data.pad, '0');
  const upperHex = hex.toUpperCase();
  return data.prefix ? '0x' + upperHex : upperHex;
}

export function formatAddress(address: number): string {
  return toHexString({number: address, pad: 8, prefix: true});
}

export function parseAddress(address: string): number|undefined {
  const hexMatch = address.match(HEXADECIMAL_REGEXP);
  const decMatch = address.match(DECIMAL_REGEXP);

  let newAddress = undefined;
  if (hexMatch && hexMatch[0].length === address.length) {
    newAddress = parseInt(address, 16);
  } else if (decMatch && decMatch[0].length === address.length) {
    newAddress = parseInt(address, 10);
  }
  return newAddress;
}