@polkadot/util/is/ascii.js

A collection of useful utilities for @polkadot

import { u8aToU8a } from '../u8a/toU8a.js';
import { isHex } from './hex.js';
import { isString } from './string.js';
/** @internal */
function isAsciiStr(str) {
    for (let i = 0, count = str.length; i < count; i++) {
        const b = str.charCodeAt(i);
        // check is inlined here, it is faster than making a call
        if (b < 32 || b > 126) {
            return false;
        }
    }
    return true;
}
/** @internal */
function isAsciiBytes(u8a) {
    for (let i = 0, count = u8a.length; i < count; i++) {
        const b = u8a[i] | 0;
        // check is inlined here, it is faster than making a call
        if (b < 32 || b > 126) {
            return false;
        }
    }
    return true;
}
/**
 * @name isAscii
 * @summary Tests if the input is printable ASCII
 * @description
 * Checks to see if the input string or Uint8Array is printable ASCII, 32-127 + formatters
 */
export function isAscii(value) {
    return isString(value)
        ? isHex(value)
            ? isAsciiBytes(u8aToU8a(value))
            : isAsciiStr(value)
        : value
            ? isAsciiBytes(value)
            : false;
}