Description Bernhard Stadler 2015-09-01 06:41:30 EDT

Created attachment 256278 [details]
Generated code

Xtend 2.8.4 seems to allow strange switch expressions like the following:

  def getFoo(Object obj) {
    switch (obj) { String: "foo", Integer: "bar" : "???" default: "!!!" }
  }

Please notice the comma after "foo" and the colon after "bar".

The commas can even be repeated, so this is grammatically correct:

  def getFoo2(Object obj) {
    switch (obj) { ,,,,,,: "???" }
  }

Also, this seems to coincidentally allow a nice shorthand:

  def getBar(Object obj) {
    switch (obj) { String: "bar" : "???" }
  }

I like the idea of allowing commas for switch case separation, and I can't think of any ambiguities involving fall-through commas.

  def getBar2(Object obj) {
    switch (obj) { String: "bar", Integer: "foo", default: "???" }
  }


Which seems to produce code equivalent to:

  def getBar3(Object obj) {
    switch (obj) { String: "bar" default: "???" }
  }

I attached the generated code.