WIP: Use rake to start compiling resources (like require.coffee)

src/app/binding-set.coffee

@@ -0,0 +1,52 @@
+$ = require 'jquery'
+_ = require 'underscore'
+fs = require 'fs'
+
+Specificity = require 'specificity'
+PEG = require 'pegjs'
+
+module.exports =
+class BindingSet
+  selector: null
+  commandsByKeystrokes: null
+  commandForEvent: null
+  parser: null
+
+  constructor: (@selector, mapOrFunction, @index) ->
+    @parser = PEG.buildParser(fs.read(require.resolve 'keystroke-pattern.pegjs'))
+    @specificity = Specificity(@selector)
+    @commandsByKeystrokes = {}
+
+    if _.isFunction(mapOrFunction)
+      @commandForEvent = mapOrFunction
+    else
+      @commandsByKeystrokes = @normalizeCommandsByKeystrokes(mapOrFunction)
+      @commandForEvent = (event) =>
+        for keystrokes, command of @commandsByKeystrokes
+          return command if event.keystrokes == keystrokes
+        null
+
+  matchesKeystrokePrefix: (event) ->
+    eventKeystrokes = event.keystrokes.split(' ')
+    for keystrokes, command of @commandsByKeystrokes
+      bindingKeystrokes = keystrokes.split(' ')
+      continue unless eventKeystrokes.length < bindingKeystrokes.length
+      return true if _.isEqual(eventKeystrokes, bindingKeystrokes[0...eventKeystrokes.length])
+    false
+
+  normalizeCommandsByKeystrokes: (commandsByKeystrokes) ->
+    normalizedCommandsByKeystrokes = {}
+    for keystrokes, command of commandsByKeystrokes
+      normalizedCommandsByKeystrokes[@normalizeKeystrokes(keystrokes)] = command
+    normalizedCommandsByKeystrokes
+
+  normalizeKeystrokes: (keystrokes) ->
+    normalizedKeystrokes = keystrokes.split(/\s+/).map (keystroke) =>
+      @normalizeKeystroke(keystroke)
+    normalizedKeystrokes.join(' ')
+
+  normalizeKeystroke: (keystroke) ->
+    keys = @parser.parse(keystroke)
+    modifiers = keys[0...-1]
+    modifiers.sort()
+    [modifiers..., _.last(keys)].join('-')