Code coverage report for code/utils/undo-redo.coffee

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
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
 
1
 
1
 
1
 
1
 
1
1
1
1
1
1
1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
15
 
15
15
 
15
 
 
15
15
15
 
 
15
15
15
15
15
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
1
1
1
1
1
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
16
16
 
 
15
 
 
16
 
 
 
 
 
 
 
 
1
15
 
 
15
15
15
15
 
 
 
15
 
 
 
1
 
 
 
 
 
 
 
 
 
 
 
1
1
8
8
8
8
 
1
 
 
 
 
# based on https://github.com/jzaefferer/undo/blob/master/undo.js
CodapConnect = require '../models/codap-connect'
 
DEFAULT_CONTEXT_NAME = 'building-models'
 
internalEndCommandBatchAction = Reflux.createAction()
 
class Manager
  constructor: (options = {}) ->
    {@debug} = options
    @commands = []
    @stackPosition = -1
    @savePosition = -1
    @changeListeners = []
    @currentBatch = null
    internalEndCommandBatchAction.listen @_finalizeEndComandBatch, @
 
  startCommandBatch: ->
    @currentBatch = new CommandBatch() unless @currentBatch
 
  endCommandBatch: ->
    # calling this via an action pushes it to the end of the
    # command stack, allowing any other commands to execute first
    internalEndCommandBatchAction()
 
  _finalizeEndComandBatch: ->
    if @currentBatch
      @commands.push @currentBatch
      @stackPosition++
      @currentBatch = null
 
  createAndExecuteCommand: (name, methods) ->
    result = @execute (new Command name, methods)
 
    codapConnect = CodapConnect.instance DEFAULT_CONTEXT_NAME
    codapConnect.sendUndoableActionPerformed()
 
    result
 
  execute: (command) ->
    @_clearRedo()
    result = command.execute @debug
    Iif @currentBatch
      @currentBatch.push command
    else
      @commands.push command
      @stackPosition++
    @_changed()
    E@log() if @debug
    result
 
  undo: ->
    if @canUndo()
      result = @commands[@stackPosition].undo @debug
      @stackPosition--
      @_changed()
      @log() if @debug
      result
    else
      false
 
  canUndo: ->
    return @stackPosition >= 0
 
  redo: ->
    if @canRedo()
      @stackPosition++
      result = @commands[@stackPosition].redo @debug
      @_changed()
      @log() if @debug
      result
    else
      false
 
  canRedo: ->
    return @stackPosition < @commands.length - 1
 
  save: ->
    @savePosition = @stackPosition
    @_changed()
 
  clearHistory: ->
    @commands = []
    @stackPosition = -1
    @savePosition = -1
    @_changed()
    E@log() if @debug
 
  dirty: ->
    return @stackPosition isnt @savePosition
 
  saved: ->
    @savePosition isnt -1
 
  revertToOriginal: ->
    @undo() while @canUndo()
 
  revertToLastSave: ->
    if @stackPosition > @savePosition
      @undo() while @dirty()
    else if @stackPosition < @savePosition
      @redo() while @dirty()
 
  addChangeListener: (listener) ->
    @changeListeners.push listener
 
  log: ->
    log.info "Undo Stack: [#{(_.pluck (@commands.slice 0, @stackPosition + 1), 'name').join ', '}]"
    log.info "Redo Stack: [#{(_.pluck (@commands.slice @stackPosition + 1), 'name').join ', '}]"
 
  _clearRedo: ->
    @commands = @commands.slice 0, @stackPosition + 1
 
  _changed: ->
    Iif @changeListeners.length > 0
      status =
        dirty: @dirty()
        canUndo: @canUndo()
        canRedo: @canRedo()
        saved: @saved()
      for listener in @changeListeners
        listener status
 
class Command
  constructor: (@name, @methods) -> undefined
 
  _call: (method, debug, via) ->
    Eif debug
      log.info("Command: #{@name}.#{method}()#{Iif via then " via #{via}" else ''}")
    Eif @methods.hasOwnProperty method
      @methods[method]()
    else
      throw new Error "Undefined #{method} method for #{@name} command"
 
  execute: (debug) -> @_call 'execute', debug
  undo: (debug) -> @_call 'undo', debug
  redo: (debug) -> @_call 'execute', debug, 'redo'
 
class CommandBatch
  constructor: ->
    @commands = []
 
  push: (command) ->
    @commands.push command
 
  undo: (debug) ->
    command.undo(debug) for command in @commands by -1
  redo: (debug) ->
    command.redo(debug) for command in @commands
 
instances = {}
instance  = (opts={}) ->
  {contextName, debug} = opts
  contextName ||= DEFAULT_CONTEXT_NAME
  instances[contextName] ||= new Manager(opts)
  instances[contextName]
 
module.exports =
  instance: instance
  constructor: Manager
  command: Command