1- 'use strict' ;
2- /*!
1+ /*!
32* it-depends - v{{ version }}
43* https://github.com/gerich-home/it-depends
54* Copyright (c) 2016 Sergey Gerasimov; Licensed MSPL
98( function ( rootObject , factory ) {
109 if ( typeof require === 'function' && typeof exports === 'object' && typeof module === 'object' ) {
1110 // CommonJS or Node
12- factory ( exports ) ;
11+ module . exports = factory ( ) ;
1312 } else if ( typeof define === 'function' && define [ 'amd' ] ) {
1413 // AMD anonymous module
1514 define ( [ ] , factory ) ;
1615 } else {
1716 // <script> tag: define the global `itDepends` object
18- var exports = { } ;
19- factory ( exports ) ;
20- rootObject . itDepends = exports ;
17+ rootObject . itDepends = factory ( ) ;
2118 }
22- } ( this , function ( exports ) {
19+ } ( this , function ( ) {
20+ 'use strict' ;
21+
2322 var nop = function ( ) { } ;
2423 var trackers = [ nop ] ;
2524 var nextId = 0 ;
2928 trackers [ trackers . length - 1 ] ( id , observableValue , currentValue ) ;
3029 } ;
3130
32- exports . value = function ( initialValue ) {
33- var currentValue = initialValue ;
34- var id = ++ nextId ;
35-
36- var self = function ( ) {
37- notifyCurrentTracker ( id , self , currentValue ) ;
38- return currentValue ;
39- } ;
40-
41- self . write = function ( newValue ) {
42- if ( currentValue !== newValue ) {
43- currentValue = newValue ;
44- lastWriteVersion ++ ;
45- }
46- } ;
47-
48- return self ;
49- } ;
50-
51- exports . computed = function ( calculator ) {
52- var currentValue ;
53- var dependencies ;
54- var id = ++ nextId ;
55- var lastReadVersion = - 1 ;
56-
57- var atLeastOneDependencyChanged = function ( ) {
58- for ( var dependencyId in dependencies ) {
59- if ( ! dependencies . hasOwnProperty ( dependencyId ) )
60- continue ;
61-
62- var dependency = dependencies [ dependencyId ] ;
63-
64- if ( dependency . observableValue ( ) !== dependency . capturedValue ) {
65- return true ;
66- }
67- }
68-
69- return false ;
70- } ;
71-
72- var needRecalcCache ;
73- var needRecalc = function ( ) {
74- if ( lastReadVersion !== lastWriteVersion ) {
75- needRecalcCache = ! dependencies || atLeastOneDependencyChanged ( ) ;
76- lastReadVersion = lastWriteVersion ;
77- }
78-
79- return needRecalcCache ;
80- } ;
81-
82- var self = function ( ) {
83- if ( needRecalc ( ) ) {
84- dependencies = { } ;
85-
86- trackers . push ( function ( dependencyId , observableValue , capturedValue ) {
87- if ( dependencies [ dependencyId ] )
88- return ;
89-
90- dependencies [ dependencyId ] = {
91- observableValue : observableValue ,
92- capturedValue : capturedValue
93- } ;
94- } ) ;
95-
96- try {
97- currentValue = calculator ( ) ;
98- } finally {
99- trackers . pop ( ) ;
100- }
101-
102- needRecalcCache = false ;
103- }
104-
105- notifyCurrentTracker ( id , self , currentValue ) ;
106-
107- return currentValue ;
108- } ;
109-
110- return self ;
111- } ;
112-
113- exports . promiseValue = function ( promise , initialValue ) {
114- var currentValue = exports . value ( initialValue ) ;
115-
116- promise . then ( currentValue . write ) ;
117-
118- return exports . computed ( currentValue ) ;
119- } ;
31+ var library = {
32+ value : function ( initialValue ) {
33+ var currentValue = initialValue ;
34+ var id = ++ nextId ;
35+
36+ var self = function ( ) {
37+ notifyCurrentTracker ( id , self , currentValue ) ;
38+ return currentValue ;
39+ } ;
40+
41+ self . write = function ( newValue ) {
42+ if ( currentValue !== newValue ) {
43+ currentValue = newValue ;
44+ lastWriteVersion ++ ;
45+ }
46+ } ;
47+
48+ return self ;
49+ } ,
50+ computed : function ( calculator ) {
51+ var currentValue ;
52+ var dependencies ;
53+ var id = ++ nextId ;
54+ var lastReadVersion = - 1 ;
55+
56+ var atLeastOneDependencyChanged = function ( ) {
57+ for ( var dependencyId in dependencies ) {
58+ if ( ! dependencies . hasOwnProperty ( dependencyId ) )
59+ continue ;
60+
61+ var dependency = dependencies [ dependencyId ] ;
62+
63+ if ( dependency . observableValue ( ) !== dependency . capturedValue ) {
64+ return true ;
65+ }
66+ }
67+
68+ return false ;
69+ } ;
70+
71+ var needRecalcCache ;
72+ var needRecalc = function ( ) {
73+ if ( lastReadVersion !== lastWriteVersion ) {
74+ needRecalcCache = ! dependencies || atLeastOneDependencyChanged ( ) ;
75+ lastReadVersion = lastWriteVersion ;
76+ }
77+
78+ return needRecalcCache ;
79+ } ;
80+
81+ var self = function ( ) {
82+ if ( needRecalc ( ) ) {
83+ dependencies = { } ;
84+
85+ trackers . push ( function ( dependencyId , observableValue , capturedValue ) {
86+ if ( dependencies [ dependencyId ] )
87+ return ;
88+
89+ dependencies [ dependencyId ] = {
90+ observableValue : observableValue ,
91+ capturedValue : capturedValue
92+ } ;
93+ } ) ;
94+
95+ try {
96+ currentValue = calculator ( ) ;
97+ } finally {
98+ trackers . pop ( ) ;
99+ }
100+
101+ needRecalcCache = false ;
102+ }
103+
104+ notifyCurrentTracker ( id , self , currentValue ) ;
105+
106+ return currentValue ;
107+ } ;
108+
109+ return self ;
110+ } ,
111+ promiseValue : function ( promise , initialValue ) {
112+ var currentValue = library . value ( initialValue ) ;
113+
114+ promise . then ( currentValue . write ) ;
115+
116+ return library . computed ( currentValue ) ;
117+ }
118+ } ;
119+
120+ return library ;
120121} ) ) ;
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