extension/packages/vim.coffee

   1 MODE_NORMAL = {}
   2
   3 class Vim
   4   constructor: ({ @window, @commands, @modes, @esc }) ->
   5     @mode       = MODE_NORMAL
   6     @keys       = []
   7     @lastKeyStr = null
   8     @suppress   = false
   9
  10     @storage =
  11       commands: {}
  12       modes: {}
  13
  14     for { name } in @commands
  15       @storage.commands[name] = {}
  16
  17     for name of @modes
  18       @storage.modes[name] = {}
  19
  20   enterMode: (mode, args) ->
  21     # Note: `args` is an array of arguments to be passed to the mode's `enter` method. We cannot use
  22     # `args...`, since that destroys the `this` context for the mode's `enter` method.
  23     @mode = mode
  24     @modes[mode].enter(this, @storage.modes[mode], args)
  25
  26   enterNormalMode: ->
  27     for name, mode of @modes
  28       mode.onEnterNormalMode?(this, @storage.modes[name])
  29     @mode = MODE_NORMAL
  30
  31   handleKeyDown: (event, keyStr) ->
  32     @suppress = true
  33     if @mode == MODE_NORMAL or keyStr == @esc
  34       @keys.push(keyStr)
  35       @lastKeyStr = keyStr
  36       if command = @findCommand(@keys)
  37         command.func(this, @storage.commands[command.name])
  38         return command.name != @esc
  39       else if @maybeCommand(@keys)
  40         return true
  41       else
  42         @keys.length = 0
  43     else if not (event.ctrlKey or event.metaKey)
  44       @modes[@mode].handleKeyDown(this, @storage.modes[@mode], event, keyStr)
  45
  46     @suppress = false
  47     @keys.length = 0
  48     return false
  49
  50   handleKeyPress: (event) ->
  51     return @lastKeyStr != @esc and @suppress
  52
  53   handleKeyUp: (event) ->
  54     suppress = @suppress
  55     @suppress = false
  56     return @lastKeyStr != @esc and suppress
  57
  58   findCommand: (keys) ->
  59     for i in [0...keys.length]
  60       str = keys[i..].join(',')
  61       for command in @commands
  62         for key in command.keys()
  63           if key == str and command.enabled()
  64             return command
  65
  66   maybeCommand: (keys) ->
  67     for i in [0...keys.length]
  68       str = keys[i..].join(',')
  69       for command in @commands
  70         for key in command.keys()
  71           if key.indexOf(str) == 0 and command.enabled()
  72             return true
  73
  74 # What is minimally required for a command
  75 class Vim.Command
  76   constructor: (@keyValues, @name) ->
  77   keys: -> return @keyValues
  78   enabled: -> return true
  79
  80 exports.Vim = Vim