87 lines
1.8 KiB
JavaScript
87 lines
1.8 KiB
JavaScript
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/** @license MIT License (c) copyright 2010-2014 original author or authors */
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/** @author Brian Cavalier */
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/** @author John Hann */
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(function(define) { 'use strict';
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define(function() {
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var parse, captureStack, format;
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if(Error.captureStackTrace) {
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// Use Error.captureStackTrace if available
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parse = function(e) {
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return e && e.stack && e.stack.split('\n');
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};
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format = formatAsString;
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captureStack = Error.captureStackTrace;
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} else {
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// Otherwise, do minimal feature detection to determine
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// how to capture and format reasonable stacks.
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parse = function(e) {
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var stack = e && e.stack && e.stack.split('\n');
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if(stack && e.message) {
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stack.unshift(e.message);
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}
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return stack;
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};
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(function() {
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var e = new Error();
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if(typeof e.stack !== 'string') {
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format = formatAsString;
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captureStack = captureSpiderMonkeyStack;
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} else {
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format = formatAsErrorWithStack;
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captureStack = useStackDirectly;
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}
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}());
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}
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function captureSpiderMonkeyStack(host) {
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try {
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throw new Error();
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} catch(err) {
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host.stack = err.stack;
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}
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}
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function useStackDirectly(host) {
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host.stack = new Error().stack;
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}
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function formatAsString(longTrace) {
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return join(longTrace);
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}
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function formatAsErrorWithStack(longTrace) {
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var e = new Error();
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e.stack = formatAsString(longTrace);
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return e;
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}
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// About 5-10x faster than String.prototype.join o_O
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function join(a) {
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var sep = false;
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var s = '';
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for(var i=0; i< a.length; ++i) {
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if(sep) {
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s += '\n' + a[i];
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} else {
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s+= a[i];
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sep = true;
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}
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}
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return s;
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}
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return {
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parse: parse,
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format: format,
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captureStack: captureStack
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};
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});
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}(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(); }));
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