Blame view

node_modules/when/monitor/error.js 1.77 KB
ce4c83ff   wxy   初始提交
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
  /** @license MIT License (c) copyright 2010-2014 original author or authors */
  /** @author Brian Cavalier */
  /** @author John Hann */
  
  (function(define) { 'use strict';
  define(function() {
  
  	var parse, captureStack, format;
  
  	if(Error.captureStackTrace) {
  		// Use Error.captureStackTrace if available
  		parse = function(e) {
  			return e && e.stack && e.stack.split('\n');
  		};
  
  		format = formatAsString;
  		captureStack = Error.captureStackTrace;
  
  	} else {
  		// Otherwise, do minimal feature detection to determine
  		// how to capture and format reasonable stacks.
  		parse = function(e) {
  			var stack = e && e.stack && e.stack.split('\n');
  			if(stack && e.message) {
  				stack.unshift(e.message);
  			}
  			return stack;
  		};
  
  		(function() {
  			var e = new Error();
  			if(typeof e.stack !== 'string') {
  				format = formatAsString;
  				captureStack = captureSpiderMonkeyStack;
  			} else {
  				format = formatAsErrorWithStack;
  				captureStack = useStackDirectly;
  			}
  		}());
  	}
  
  	function captureSpiderMonkeyStack(host) {
  		try {
  			throw new Error();
  		} catch(err) {
  			host.stack = err.stack;
  		}
  	}
  
  	function useStackDirectly(host) {
  		host.stack = new Error().stack;
  	}
  
  	function formatAsString(longTrace) {
  		return join(longTrace);
  	}
  
  	function formatAsErrorWithStack(longTrace) {
  		var e = new Error();
  		e.stack = formatAsString(longTrace);
  		return e;
  	}
  
  	// About 5-10x faster than String.prototype.join o_O
  	function join(a) {
  		var sep = false;
  		var s = '';
  		for(var i=0; i< a.length; ++i) {
  			if(sep) {
  				s += '\n' + a[i];
  			} else {
  				s+= a[i];
  				sep = true;
  			}
  		}
  		return s;
  	}
  
  	return {
  		parse: parse,
  		format: format,
  		captureStack: captureStack
  	};
  
  });
  }(typeof define === 'function' && define.amd ? define : function(factory) { module.exports = factory(); }));