Allow scoped-properties to be added/removed by name

Also:
  - remove "global" properties
  - clear scoped properties between specs

spec/app/syntax-spec.coffee

@@ -68,12 +68,11 @@ describe "the `syntax` global", ->
       syntax.addProperties(".source.coffee .string.quoted.double.coffee", foo: bar: baz: 42)
       syntax.addProperties(".source .string.quoted.double", foo: bar: baz: 22)
       syntax.addProperties(".source", foo: bar: baz: 11)
-      syntax.addProperties(foo: bar: baz: 1)
 
       expect(syntax.getProperty([".source.coffee", ".string.quoted.double.coffee"], "foo.bar.baz")).toBe 42
       expect(syntax.getProperty([".source.js", ".string.quoted.double.js"], "foo.bar.baz")).toBe 22
       expect(syntax.getProperty([".source.js", ".variable.assignment.js"], "foo.bar.baz")).toBe 11
-      expect(syntax.getProperty([".text"], "foo.bar.baz")).toBe 1
+      expect(syntax.getProperty([".text"], "foo.bar.baz")).toBeUndefined()
 
     it "favors the most recently added properties in the event of a specificity tie", ->
       syntax.addProperties(".source.coffee .string.quoted.single", foo: bar: baz: 42)
@@ -81,3 +80,12 @@ describe "the `syntax` global", ->
 
       expect(syntax.getProperty([".source.coffee", ".string.quoted.single"], "foo.bar.baz")).toBe 42
       expect(syntax.getProperty([".source.coffee", ".string.quoted.single.double"], "foo.bar.baz")).toBe 22
+
+  describe ".removeProperties(name)", ->
+    it "allows properties to be removed by name", ->
+      syntax.addProperties("a", ".source.coffee .string.quoted.double.coffee", foo: bar: baz: 42)
+      syntax.addProperties("b", ".source .string.quoted.double", foo: bar: baz: 22)
+
+      syntax.removeProperties("b")
+      expect(syntax.getProperty([".source.js", ".string.quoted.double.js"], "foo.bar.baz")).toBeUndefined()
+      expect(syntax.getProperty([".source.coffee", ".string.quoted.double.coffee"], "foo.bar.baz")).toBe 42

spec/spec-helper.coffee

@@ -42,6 +42,7 @@ beforeEach ->
   spyOn(atom, 'getSavedWindowState').andReturn(null)
   $native.setWindowState('')
   syntax.clearGrammarOverrides()
+  syntax.clearProperties()
 
   # used to reset keymap after each spec
   bindingSetsToRestore = _.clone(keymap.bindingSets)

src/app/syntax.coffee

@@ -22,7 +22,6 @@ class Syntax
     @grammarsByFileType = {}
     @grammarsByScopeName = {}
     @grammarOverridesByPath = {}
-    @globalProperties = {}
     @scopedPropertiesIndex = 0
     @scopedProperties = []
     @nullGrammar = new NullGrammar
@@ -101,18 +100,24 @@ class Syntax
     @grammarsByScopeName[scopeName]
 
   addProperties: (args...) ->
-    selector = args.shift() if args.length > 1
-    properties = args.shift()
+    name = args.shift() if args.length > 2
+    [selector, properties] = args
 
-    if selector
-      @scopedProperties.unshift(
-        selector: selector,
-        properties: properties,
-        specificity: Specificity(selector),
-        index: @scopedPropertiesIndex++
-      )
-    else
-      _.extend(@globalProperties, properties)
+    @scopedProperties.unshift(
+      name: name
+      selector: selector,
+      properties: properties,
+      specificity: Specificity(selector),
+      index: @scopedPropertiesIndex++
+    )
+
+  removeProperties: (name) ->
+    for properties in @scopedProperties.filter((properties) -> properties.name is name)
+      _.remove(@scopedProperties, properties)
+
+  clearProperties: ->
+    @scopedProperties = []
+    @scopedPropertiesIndex = 0
 
   getProperty: (scope, keyPath) ->
     for object in @propertiesForScope(scope, keyPath)
@@ -128,7 +133,7 @@ class Syntax
       while element
         matchingProperties.push(@matchingPropertiesForElement(element, candidates)...)
         element = element.parentNode
-    matchingProperties.concat([@globalProperties])
+    matchingProperties
 
   matchingPropertiesForElement: (element, candidates) ->
     matchingScopedProperties = candidates.filter ({selector}) ->