extension/lib/vimfx.coffee

   1 ###
   2 # Copyright Simon Lydell 2015.
   3 #
   4 # This file is part of VimFx.
   5 #
   6 # VimFx is free software: you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation, either version 3 of the License, or
   9 # (at your option) any later version.
  10 #
  11 # VimFx is distributed in the hope that it will be useful,
  12 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 # GNU General Public License for more details.
  15 #
  16 # You should have received a copy of the GNU General Public License
  17 # along with VimFx.  If not, see <http://www.gnu.org/licenses/>.
  18 ###
  19
  20 # This file defines a top-level object to hold global state for VimFx. It keeps
  21 # track of all `Vim` instances (vim.coffee), all options and all keyboard
  22 # shortcuts. It can consume key presses according to its commands, and return
  23 # the commands for UI presentation. There is only one `VimFx` instance.
  24
  25 notation = require('vim-like-key-notation')
  26 prefs    = require('./prefs')
  27 utils    = require('./utils')
  28 Vim      = require('./vim')
  29
  30 DIGIT     = /^\d$/
  31
  32 class VimFx extends utils.EventEmitter
  33   constructor: (@modes, @options) ->
  34     super()
  35     @vims = new WeakMap()
  36     @createKeyTrees()
  37     @reset()
  38     @on('modechange', ({mode}) => @reset(mode))
  39
  40   SPECIAL_KEYS: ['<force>', '<late>']
  41
  42   addVim: (browser) ->
  43     @vims.set(browser, new Vim(browser, this))
  44
  45   # NOTE: This method is often called in event handlers. Many events may fire
  46   # before a `vim` object has been created for the current tab yet (such as when
  47   # the browser is starting up). Therefore always check if anything was
  48   # returned, such as:
  49   #
  50   #     return unless vim = @vimfx.getCurrentVim(@window)
  51   getCurrentVim: (window) -> @vims.get(window.gBrowser.selectedBrowser)
  52
  53   reset: (mode = null) ->
  54     @currentKeyTree = if mode then @keyTrees[mode] else {}
  55     @lastInputTime = 0
  56     @count = ''
  57
  58   createKeyTrees: ->
  59     {
  60       @keyTrees
  61       @commandsWithSpecialKeys
  62       @errors
  63     } = createKeyTrees(@getGroupedCommands(), @SPECIAL_KEYS)
  64
  65   stringifyKeyEvent: (event) ->
  66     return notation.stringify(event, {
  67       ignoreKeyboardLayout: @options.ignore_keyboard_layout
  68       translations: @options.translations
  69     })
  70
  71   consumeKeyEvent: (event, vim, focusType) ->
  72     { mode } = vim
  73     return unless keyStr = @stringifyKeyEvent(event)
  74
  75     now = Date.now()
  76     @reset(mode) if now - @lastInputTime >= @options.timeout
  77     @lastInputTime = now
  78
  79     toplevel = (@currentKeyTree == @keyTrees[mode])
  80
  81     if toplevel and @options.keyValidator
  82       unless @options.keyValidator(keyStr, mode)
  83         @reset(mode)
  84         return
  85
  86     type = 'none'
  87     command = null
  88
  89     switch
  90       when toplevel and DIGIT.test(keyStr) and
  91            not (keyStr == '0' and @count == '')
  92         @count += keyStr
  93         type = 'count'
  94
  95       when keyStr of @currentKeyTree
  96         next = @currentKeyTree[keyStr]
  97         if next instanceof Leaf
  98           type = 'full'
  99           command = next.command
 100         else
 101           @currentKeyTree = next
 102           type = 'partial'
 103
 104       else
 105         @reset(mode)
 106
 107     count = if @count == '' then undefined else Number(@count)
 108     specialKeys = @commandsWithSpecialKeys[command?.pref] ? {}
 109     focus = @adjustFocusType(event, vim, focusType, keyStr)
 110     unmodifiedKey = notation.parse(keyStr).key
 111     @reset(mode) if type == 'full'
 112     return {
 113       type, focus, command, count, specialKeys, keyStr, unmodifiedKey, toplevel
 114     }
 115
 116   adjustFocusType: (event, vim, focusType, keyStr) ->
 117     # Frame scripts and the tests don’t pass in `originalTarget`.
 118     document = event.originalTarget?.ownerDocument
 119     if focusType == null and document and
 120        (vim.window.TabView.isVisible() or
 121         document.fullscreenElement or document.mozFullScreenElement)
 122       return 'other'
 123
 124     keys = @options["#{ focusType }_element_keys"]
 125     return null if keys and keyStr not in keys
 126
 127     return focusType
 128
 129   getGroupedCommands: (options = {}) ->
 130     modes = {}
 131     for modeName, mode of @modes
 132       if options.enabledOnly
 133         usedSequences = getUsedSequences(@keyTrees[modeName])
 134       for commandName, command of mode.commands
 135         enabledSequences = null
 136         if options.enabledOnly
 137           enabledSequences = utils.removeDuplicates(
 138             command._sequences.filter((sequence) ->
 139               return (usedSequences[sequence] == command.pref)
 140             )
 141           )
 142           continue if enabledSequences.length == 0
 143         categories = modes[modeName] ?= {}
 144         category = categories[command.category] ?= []
 145         category.push({command, enabledSequences, order: command.order})
 146
 147     modesSorted = []
 148     for modeName, categories of modes
 149       categoriesSorted = []
 150       for categoryName, commands of categories
 151         category = @options.categories[categoryName]
 152         categoriesSorted.push({
 153           name:     category.name()
 154           _name:    categoryName
 155           order:    category.order
 156           commands: commands.sort(byOrder)
 157         })
 158       mode = @modes[modeName]
 159       modesSorted.push({
 160         name:       mode.name()
 161         _name:      modeName
 162         order:      mode.order
 163         categories: categoriesSorted.sort(byOrder)
 164       })
 165     return modesSorted.sort(byOrder)
 166
 167 byOrder = (a, b) -> a.order - b.order
 168
 169 class Leaf
 170   constructor: (@command, @originalSequence) ->
 171
 172 createKeyTrees = (groupedCommands, specialKeys) ->
 173   keyTrees = {}
 174   errors = {}
 175   commandsWithSpecialKeys = {}
 176
 177   pushError = (error, command) ->
 178     (errors[command.pref] ?= []).push(error)
 179
 180   pushOverrideErrors = (command, tree) ->
 181     { command: overridingCommand, originalSequence } = getFirstLeaf(tree)
 182     error =
 183       id:      'overridden_by'
 184       subject: overridingCommand.description()
 185       context: originalSequence
 186     pushError(error, command)
 187
 188   pushSpecialKeyError = (command, originalSequence, key) ->
 189     error =
 190       id: 'illegal_special_key'
 191       subject: key
 192       context: originalSequence
 193     pushError(error, command)
 194
 195   for mode in groupedCommands
 196     keyTrees[mode._name] = {}
 197     for category in mode.categories then for { command } in category.commands
 198       { shortcuts, errors: parseErrors } = parseShortcutPref(command.pref)
 199       pushError(error, command) for error in parseErrors
 200       command._sequences = []
 201
 202       for shortcut in shortcuts
 203         [ prefixKeys..., lastKey ] = shortcut.normalized
 204         tree = keyTrees[mode._name]
 205         command._sequences.push(shortcut.original)
 206         seenNonSpecialKey = false
 207
 208         errored = false
 209         for prefixKey, index in prefixKeys
 210           if prefixKey in specialKeys
 211             if seenNonSpecialKey
 212               pushSpecialKeyError(command, shortcut.original, prefixKey)
 213               errored = true
 214               break
 215             else
 216               (commandsWithSpecialKeys[command.pref] ?= {})[prefixKey] = true
 217               continue
 218           else
 219             seenNonSpecialKey = true
 220
 221           if prefixKey of tree
 222             next = tree[prefixKey]
 223             if next instanceof Leaf
 224               pushOverrideErrors(command, next)
 225               errored = true
 226               break
 227             else
 228               tree = next
 229           else
 230             tree = tree[prefixKey] = {}
 231         continue if errored
 232
 233         if lastKey in specialKeys
 234           subject = if seenNonSpecialKey then lastKey else shortcut.original
 235           pushSpecialKeyError(command, shortcut.original, subject)
 236           continue
 237         if lastKey of tree
 238           pushOverrideErrors(command, tree[lastKey])
 239           continue
 240         tree[lastKey] = new Leaf(command, shortcut.original)
 241
 242   return {keyTrees, commandsWithSpecialKeys, errors}
 243
 244 parseShortcutPref = (pref) ->
 245   shortcuts = []
 246   errors    = []
 247
 248   # The shorcut prefs are read from root in order to support other extensions to
 249   # extend VimFx with custom commands.
 250   prefValue = prefs.root.get(pref).trim()
 251
 252   unless prefValue == ''
 253     for sequence in prefValue.split(/\s+/)
 254       shortcut = []
 255       errored  = false
 256       for key in notation.parseSequence(sequence)
 257         try
 258           shortcut.push(notation.normalize(key))
 259         catch error
 260           throw error unless error.id?
 261           errors.push(error)
 262           errored = true
 263           break
 264       shortcuts.push({normalized: shortcut, original: sequence}) unless errored
 265
 266   return {shortcuts, errors}
 267
 268 getFirstLeaf = (node) ->
 269   if node instanceof Leaf
 270     return node
 271   for key, value of node
 272     return getFirstLeaf(value)
 273
 274 getLeaves = (node) ->
 275   if node instanceof Leaf
 276     return [node]
 277   leaves = []
 278   for key, value of node
 279     leaves.push(getLeaves(value)...)
 280   return leaves
 281
 282 getUsedSequences = (tree) ->
 283   usedSequences = {}
 284   for leaf in getLeaves(tree)
 285     usedSequences[leaf.originalSequence] = leaf.command.pref
 286   return usedSequences
 287
 288 module.exports = VimFx