88 lines
1.7 KiB
JavaScript
88 lines
1.7 KiB
JavaScript
'use strict';
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const internals = {};
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module.exports = function (input) {
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if (!input) {
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return '';
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}
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let escaped = '';
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for (let i = 0; i < input.length; ++i) {
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const charCode = input.charCodeAt(i);
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if (internals.isSafe(charCode)) {
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escaped += input[i];
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}
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else {
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escaped += internals.escapeHtmlChar(charCode);
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}
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}
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return escaped;
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};
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internals.escapeHtmlChar = function (charCode) {
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const namedEscape = internals.namedHtml.get(charCode);
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if (namedEscape) {
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return namedEscape;
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}
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if (charCode >= 256) {
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return '&#' + charCode + ';';
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}
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const hexValue = charCode.toString(16).padStart(2, '0');
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return `&#x${hexValue};`;
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};
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internals.isSafe = function (charCode) {
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return internals.safeCharCodes.has(charCode);
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};
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internals.namedHtml = new Map([
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[38, '&'],
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[60, '<'],
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[62, '>'],
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[34, '"'],
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[160, ' '],
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[162, '¢'],
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[163, '£'],
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[164, '¤'],
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[169, '©'],
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[174, '®']
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]);
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internals.safeCharCodes = (function () {
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const safe = new Set();
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for (let i = 32; i < 123; ++i) {
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if ((i >= 97) || // a-z
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(i >= 65 && i <= 90) || // A-Z
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(i >= 48 && i <= 57) || // 0-9
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i === 32 || // space
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i === 46 || // .
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i === 44 || // ,
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i === 45 || // -
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i === 58 || // :
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i === 95) { // _
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safe.add(i);
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}
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}
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return safe;
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}());
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