Start on TextMateTheme object

spec/app/text-mate-theme-spec.coffee

@@ -0,0 +1,49 @@
+fs = require 'fs'
+plist = require 'plist'
+TextMateTheme = require 'text-mate-theme'
+
+describe "TextMateTheme", ->
+  theme = null
+  beforeEach ->
+    twilightPlist = fs.read(require.resolve('Twilight.tmTheme'))
+    plist.parseString twilightPlist, (err, data) ->
+      theme = new TextMateTheme(data[0])
+
+  describe ".getRulesets()", ->
+    rulesets = null
+
+    beforeEach ->
+      rulesets = theme.getRulesets()
+
+    it "returns rulesets representing the theme's global style settings", ->
+      expect(rulesets[0]).toEqual
+        selector: '.editor'
+        properties:
+          'background-color': '#141414'
+          'color': '#F8F8F8'
+
+      expect(rulesets[1]).toEqual
+        selector: '.editor.focused .cursor'
+        properties:
+          'border-color': '#A7A7A7'
+
+      expect(rulesets[2]).toEqual
+        selector: '.editor.focused .selection'
+        properties:
+          'background-color': "rgba(221, 240, 255, 51)"
+
+    it "returns an array of objects representing the theme's scope selectors", ->
+      expect(rulesets[11]).toEqual
+        comment: "Invalid – Deprecated"
+        selector: "invalid--deprecated"
+        properties:
+          'color': "#D2A8A1"
+          'font-style': 'italic'
+          'text-decoration': 'underline'
+
+      expect(rulesets[12]).toEqual
+        comment: "Invalid – Illegal"
+        selector: "invalid--illegal"
+        properties:
+          'color': "#F8F8F8"
+          'background-color': 'rgba(86, 45, 86, 191)'

src/app/text-mate-theme.coffee

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+_ = require 'underscore'
+
+module.exports =
+class TextMateTheme
+  constructor: ({@name, settings}) ->
+    @rulesets = []
+    globalSettings = settings[0]
+    @buildGlobalSettingsRulesets(settings[0])
+    @buildScopeSelectorRulesets(settings[1..])
+
+  getRulesets: -> @rulesets
+
+  buildGlobalSettingsRulesets: ({settings}) ->
+    { background, foreground, caret, selection } = settings
+
+    @rulesets.push
+      selector: '.editor'
+      properties:
+        'background-color': @translateColor(background)
+        'color': @translateColor(foreground)
+
+    @rulesets.push
+      selector: '.editor.focused .cursor'
+      properties:
+        'border-color': @translateColor(caret)
+
+    @rulesets.push
+      selector: '.editor.focused .selection'
+      properties:
+        'background-color': @translateColor(selection)
+
+  buildScopeSelectorRulesets: (scopeSelectorSettings) ->
+    for { name, scope, settings } in scopeSelectorSettings
+      continue unless scope
+      @rulesets.push
+        comment: name
+        selector: @translateScopeSelector(scope)
+        properties: @translateScopeSelectorSettings(settings)
+
+  translateScopeSelector: (textmateScopeSelector) ->
+    textmateScopeSelector.replace('.', '--')
+
+  translateScopeSelectorSettings: ({ foreground, background, fontStyle }) ->
+    properties = {}
+
+    if fontStyle
+      fontStyles = fontStyle.split(/\s+/)
+      properties['font-weight'] = 'bold' if _.contains(fontStyles, 'bold')
+      properties['font-style'] = 'italic' if _.contains(fontStyles, 'italic')
+      properties['text-decoration'] = 'underline' if _.contains(fontStyles, 'underline')
+
+    properties['color'] = @translateColor(foreground) if foreground
+    properties['background-color'] = @translateColor(background) if background
+    properties
+
+  translateColor: (textmateColor) ->
+    if textmateColor.length <= 7
+      textmateColor
+    else
+      r = parseInt(textmateColor[1..2], 16)
+      g = parseInt(textmateColor[3..4], 16)
+      b = parseInt(textmateColor[5..6], 16)
+      a = parseInt(textmateColor[7..8], 16)
+      "rgba(#{r}, #{g}, #{b}, #{a})"