Iss4248 unicode code point escapes (cleanup) (#4522)

* Fix #4248: Unicode code point escapes

* rewrite unicode code point escapes as unicode escapes

* smarter defaults

* and resimplify

* correct surrogate pairs

* fixes from code review

* handle adjacent code point escapes

* smarter regex

* fix from code review

* refactor toJS() to shared test helper

test/modules.coffee

@@ -36,12 +36,6 @@
 # CoffeeScript also supports optional commas within `{ … }`.
 
 
-# Helper function
-toJS = (str) ->
-  CoffeeScript.compile str, bare: yes
-  .replace /^\s+|\s+$/g, '' # Trim leading/trailing whitespace
-
-
 # Import statements
 
 test "backticked import statement", ->

test/regexps.coffee

@@ -6,12 +6,6 @@
 # * Regexen
 # * Heregexen
 
-# Helper function
-toJS = (str) ->
-  CoffeeScript.compile str, bare: yes
-  .replace /^\s+|\s+$/g, '' # Trim leading/trailing whitespace
-
-
 test "basic regular expression literals", ->
   ok 'a'.match(/a/)
   ok 'a'.match /a/

test/strings.coffee

@@ -7,12 +7,6 @@
 # * Strings
 # * Heredocs
 
-# Helper function
-toJS = (str) ->
-  CoffeeScript.compile str, bare: yes
-  .replace /^\s+|\s+$/g, '' # Trim leading/trailing whitespace
-
-
 test "backslash escapes", ->
   eq "\\/\\\\", /\/\\/.source
 

test/support/helpers.coffee

@@ -15,3 +15,7 @@ arrayEgal = (a, b) ->
 
 exports.eq      = (a, b, msg) -> ok egal(a, b), msg or "Expected #{a} to equal #{b}"
 exports.arrayEq = (a, b, msg) -> ok arrayEgal(a,b), msg or "Expected #{a} to deep equal #{b}"
+
+exports.toJS = (str) ->
+  CoffeeScript.compile str, bare: yes
+  .replace /^\s+|\s+$/g, '' # Trim leading/trailing whitespace