tap-unfunk/lib/escapeString.js

Unfunky TAP reporter with object/string diff support

var jsesc = require('jsesc');

var escapableExp = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g;

var meta = {
    '\b': '\\b',
    '\t': '\\t',
    '\n': '\\n',
    '\f': '\\f',
    '\r': '\\r',
    '\'': '\\\'',
    '\\': '\\\\'
};

var jsonNW = {
    json: true,
    wrap: false,
    quotes: 'single'
};

var whiteSpace = /\s/;

// JSON escape: https://github.com/douglascrockford/JSON-js/blob/master/json2.js#L211
// If the string contains no control characters, no quote characters, and no
// backslash characters, then we can safely slap some quotes around it.
// Otherwise we must also replace the offending characters with safe escape sequences.
function escapeString(str) {
    escapableExp.lastIndex = 0;
    if (escapableExp.test(str)) {
        return '\'' + str.replace(escapableExp, function (a) {
            var c = meta[a];
            if (typeof c === 'string') {
                return c;
            }
//return '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
            return jsesc(a, jsonNW);
        }) + '\'';
    }
    if (whiteSpace.test(str)) {
        return '\'' + str + '\'';
    }
    return str;
}

module.exports = escapeString;