stringify.js

//
// Public domain
// This whole code come from Douglas Crockford's JSON2 library except some
// minor change on the first line of the str() function (see next comment)
//
//
(function() {
    var cx = /[\u0000\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
            escapable = /[\\\"\x00-\x1f\x7f-\x9f\u00ad\u0600-\u0604\u070f\u17b4\u17b5\u200c-\u200f\u2028-\u202f\u2060-\u206f\ufeff\ufff0-\uffff]/g,
            gap,
            indent,
            meta = {
                '\b': '\\b',
                '\t': '\\t',
                '\n': '\\n',
                '\f': '\\f',
                '\r': '\\r',
                '"' : '\\"',
                '\\': '\\\\'
            },
            rep;
    
    function quote(string) {
        escapable.lastIndex = 0;
        return escapable.test(string) ? '"' + string.replace(escapable, function (a) {
            var c = meta[a];
            return typeof c === 'string'
                ? c
                : '\\u' + ('0000' + a.charCodeAt(0).toString(16)).slice(-4);
        }) + '"' : '"' + string + '"';
    }
    
    function str(key, holder) {
        var i,
            k,
            v,
            length,
            mind = gap,
            partial,
            value;
        
        //
        // Changes from Douglas Crockford's version, the five next code lines
        // avoid errors when accessing a value through a getter that raise an
        // ulgy error
        // previously : value = holder[key];
        //
        
        try {
            value = holder[key];
        } catch (Error) {
            value = "accessor error";
        }
    
        if (value && typeof value === 'object' &&
                typeof value.toJSON === 'function') {
            value = value.toJSON(key);
        }
    
        if (typeof rep === 'function') {
            value = rep.call(holder, key, value);
        }
    
        switch (typeof value) {
        case 'string':
            return quote(value);
    
        case 'number':
            return isFinite(value) ? String(value) : 'null';
    
        case 'boolean':
        case 'null':
            return String(value);
    
    
        case 'object':
            if (!value) {
                return 'null';
            }
    
    
            gap += indent;
            partial = [];
    
    
            if (Object.prototype.toString.apply(value) === '[object Array]') {
    
    
                length = value.length;
                for (i = 0; i < length; i += 1) {
                    partial[i] = str(i, value) || 'null';
                }
    
                v = partial.length === 0
                    ? '[]'
                    : gap
                    ? '[\n' + gap + partial.join(',\n' + gap) + '\n' + mind + ']'
                    : '[' + partial.join(',') + ']';
                gap = mind;
                return v;
            }
    
            if (rep && typeof rep === 'object') {
                length = rep.length;
                for (i = 0; i < length; i += 1) {
                    if (typeof rep[i] === 'string') {
                        k = rep[i];
                        v = str(k, value);
                        if (v) {
                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
                        }
                    }
                }
            } else {
                for (k in value) {
                    if (Object.prototype.hasOwnProperty.call(value, k)) {
                        v = str(k, value);
                        if (v) {
                            partial.push(quote(k) + (gap ? ': ' : ':') + v);
                        }
                    }
                }
            }
    
            v = partial.length === 0
                ? '{}'
                : gap
                ? '{\n' + gap + partial.join(',\n' + gap) + '\n' + mind + '}'
                : '{' + partial.join(',') + '}';
            gap = mind;
            return v;
        }
    };
    
    stringify = function stringify(value, replacer, space) {
        var i;
        gap = '';
        indent = '';
    
        if (typeof space === 'number') {
            for (i = 0; i < space; i += 1) {
                indent += ' ';
            }
        } else if (typeof space === 'string') {
            indent = space;
        }
    
        rep = replacer;
        if (replacer && typeof replacer !== 'function' &&
                (typeof replacer !== 'object' ||
                typeof replacer.length !== 'number')) {
            throw new Error('JSON.stringify');
        }
    
        return str('', {'': value});
    };
    
    module.exports = stringify;
})();