70 lines
1.3 KiB
JavaScript
70 lines
1.3 KiB
JavaScript
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 = new WeakMap()
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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.has(obj)) {
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return '[Circular]'
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}
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seen.set(obj, true)
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if (typeof obj.toJSON === 'function') {
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try {
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var fResult = visit(obj.toJSON())
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seen.delete(obj)
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return fResult
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} catch(err) {
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seen.delete(obj)
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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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var aResult = obj.map(visit)
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seen.delete(obj)
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return aResult
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}
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var result = 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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seen.delete(obj)
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return result
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}
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return visit(obj)
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}
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function safeJson(data, replacer, space) {
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return JSON.stringify(ensureProperties(data), replacer, space)
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}
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safeJson.ensureProperties = ensureProperties
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export default safeJson
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