60 lines
1.2 KiB
JavaScript
60 lines
1.2 KiB
JavaScript
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var hasProp = Object.prototype.hasOwnProperty;
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function throwsMessage(err) {
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return '[Throws: ' + (err ? err.message : '?') + ']';
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}
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function safeGetValueFromPropertyOnObject(obj, property) {
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if (hasProp.call(obj, property)) {
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try {
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return obj[property];
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}
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catch (err) {
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return throwsMessage(err);
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}
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}
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return obj[property];
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}
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function ensureProperties(obj) {
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var seen = [ ]; // store references to objects we have seen before
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function visit(obj) {
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if (obj === null || typeof obj !== 'object') {
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return obj;
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}
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if (seen.indexOf(obj) !== -1) {
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return '[Circular]';
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}
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seen.push(obj);
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if (typeof obj.toJSON === 'function') {
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try {
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return visit(obj.toJSON());
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} catch(err) {
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return throwsMessage(err);
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}
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}
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if (Array.isArray(obj)) {
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return obj.map(visit);
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}
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return Object.keys(obj).reduce(function(result, prop) {
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// prevent faulty defined getter properties
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result[prop] = visit(safeGetValueFromPropertyOnObject(obj, prop));
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return result;
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}, {});
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};
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return visit(obj);
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}
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module.exports = function(data) {
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return JSON.stringify(ensureProperties(data));
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}
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module.exports.ensureProperties = ensureProperties;
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