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Contents
'use strict';
var GetIntrinsic = require('get-intrinsic');
var $Number = GetIntrinsic('%Number%');
var $SyntaxError = GetIntrinsic('%SyntaxError%');
var $TypeError = GetIntrinsic('%TypeError%');
var IsIntegralNumber = require('./IsIntegralNumber');
var substring = require('./substring');
var Type = require('./Type');
var isNaN = require('../helpers/isNaN');
// https://262.ecma-international.org/14.0/#sec-parsehexoctet
module.exports = function ParseHexOctet(string, position) {
if (Type(string) !== 'String') {
throw new $TypeError('Assertion failed: `string` must be a String');
}
if (!IsIntegralNumber(position) || position < 0) {
throw new $TypeError('Assertion failed: `position` must be a nonnegative integer');
}
var len = string.length; // step 1
if ((position + 2) > len) { // step 2
var error = new $SyntaxError('requested a position on a string that does not contain 2 characters at that position'); // step 2.a
return [error]; // step 2.b
}
var hexDigits = substring(string, position, position + 2); // step 3
var n = $Number('0x' + hexDigits);
if (isNaN(n)) {
return [new $SyntaxError('Invalid hexadecimal characters')];
}
return n;
/*
4. Let _parseResult_ be ParseText(StringToCodePoints(_hexDigits_), |HexDigits[~Sep]|).
5. If _parseResult_ is not a Parse Node, return _parseResult_.
6. Let _n_ be the unsigned 8-bit value corresponding with the MV of _parseResult_.
7. Return _n_.
*/
};
Version data entries
27 entries across 27 versions & 2 rubygems