escape.js
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'use strict';
// Declare internals
const internals = {};
exports.escapeJavaScript = 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.escapeJavaScriptChar(charCode);
}
}
return escaped;
};
exports.escapeHtml = 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;
};
exports.escapeJson = function (input) {
if (!input) {
return '';
}
const lessThan = 0x3C;
const greaterThan = 0x3E;
const andSymbol = 0x26;
const lineSeperator = 0x2028;
// replace method
let charCode;
return input.replace(/[<>&\u2028\u2029]/g, (match) => {
charCode = match.charCodeAt(0);
if (charCode === lessThan) {
return '\\u003c';
}
else if (charCode === greaterThan) {
return '\\u003e';
}
else if (charCode === andSymbol) {
return '\\u0026';
}
else if (charCode === lineSeperator) {
return '\\u2028';
}
return '\\u2029';
});
};
internals.escapeJavaScriptChar = function (charCode) {
if (charCode >= 256) {
return '\\u' + internals.padLeft('' + charCode, 4);
}
const hexValue = Buffer.from(String.fromCharCode(charCode), 'ascii').toString('hex');
return '\\x' + internals.padLeft(hexValue, 2);
};
internals.escapeHtmlChar = function (charCode) {
const namedEscape = internals.namedHtml[charCode];
if (typeof namedEscape !== 'undefined') {
return namedEscape;
}
if (charCode >= 256) {
return '&#' + charCode + ';';
}
const hexValue = Buffer.from(String.fromCharCode(charCode), 'ascii').toString('hex');
return '&#x' + internals.padLeft(hexValue, 2) + ';';
};
internals.padLeft = function (str, len) {
while (str.length < len) {
str = '0' + str;
}
return str;
};
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;
}());