Code coverage report for src/util.js

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
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
 
1
 
5
5
5
37
 
 
5
 
 
 
1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
 
/* Common utilities */
WaveSurfer.util = {
    extend: function (dest) {
        var sources = Array.prototype.slice.call(arguments, 1);
        sources.forEach(function (source) {
            Object.keys(source).forEach(function (key) {
                dest[key] = source[key];
            });
        });
        return dest;
    },
 
    getId: function () {
        return 'wavesurfer_' + Math.random().toString(32).substring(2);
    },
 
    ajax: function (options) {
        var ajax = Object.create(WaveSurfer.Observer);
        var xhr = new XMLHttpRequest();
        var fired100 = false;
 
        xhr.open(options.method || 'GET', options.url, true);
        xhr.responseType = options.responseType || 'json';
 
        xhr.addEventListener('progress', function (e) {
            ajax.fireEvent('progress', e);
            if (e.lengthComputable && e.loaded == e.total) {
                fired100 = true;
            }
        });
 
        xhr.addEventListener('load', function (e) {
            if (!fired100) {
                ajax.fireEvent('progress', e);
            }
            ajax.fireEvent('load', e);
 
            if (200 == xhr.status || 206 == xhr.status) {
                ajax.fireEvent('success', xhr.response, e);
            } else {
                ajax.fireEvent('error', e);
            }
        });
 
        xhr.addEventListener('error', function (e) {
            ajax.fireEvent('error', e);
        });
 
        xhr.send();
        ajax.xhr = xhr;
        return ajax;
    }
};
 
 
/* Observer */
WaveSurfer.Observer = {
    /**
     * Attach a handler function for an event.
     */
    on: function (event, fn) {
        if (!this.handlers) { this.handlers = {}; }
 
        var handlers = this.handlers[event];
        if (!handlers) {
            handlers = this.handlers[event] = [];
        }
        handlers.push(fn);
 
        // Return an event descriptor
        return {
            name: event,
            callback: fn,
            un: this.un.bind(this, event, fn)
        };
    },
 
    /**
     * Remove an event handler.
     */
    un: function (event, fn) {
        if (!this.handlers) { return; }
 
        var handlers = this.handlers[event];
        if (handlers) {
            if (fn) {
                for (var i = handlers.length - 1; i >= 0; i--) {
                    if (handlers[i] == fn) {
                        handlers.splice(i, 1);
                    }
                }
            } else {
                handlers.length = 0;
            }
        }
    },
 
    /**
     * Remove all event handlers.
     */
    unAll: function () {
        this.handlers = null;
    },
 
    /**
     * Attach a handler to an event. The handler is executed at most once per
     * event type.
     */
    once: function (event, handler) {
        var my = this;
        var fn = function () {
            handler.apply(this, arguments);
            setTimeout(function () {
                my.un(event, fn);
            }, 0);
        };
        return this.on(event, fn);
    },
 
    fireEvent: function (event) {
        if (!this.handlers) { return; }
        var handlers = this.handlers[event];
        var args = Array.prototype.slice.call(arguments, 1);
        handlers && handlers.forEach(function (fn) {
            fn.apply(null, args);
        });
    }
};
 
 
/* Make the main WaveSurfer object an observer */
WaveSurfer.util.extend(WaveSurfer, WaveSurfer.Observer);