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