Issue #1547 'use strict' octal escape sequences prohibited

RegExp updated (thanks @michaelficarra)
and hex escapes for colors in Cakefile

tests updated (thanks @satyr)

error message conforms to existing Lexer SyntaxErrors

Cakefile

@@ -11,10 +11,10 @@ unless process.platform is 'win32'
 
 bold = red = green = reset = ''
 if enableColors
-  bold  = '\033[0;1m'
-  red   = '\033[0;31m'
-  green = '\033[0;32m'
-  reset = '\033[0m'
+  bold  = '\x1B[0;1m'
+  red   = '\x1B[0;31m'
+  green = '\x1B[0;32m'
+  reset = '\x1B[0m'
 
 # Built file header.
 header = """

src/lexer.coffee

@@ -156,6 +156,8 @@ exports.Lexer = class Lexer
           @token 'STRING', @escapeLines string
       else
         return 0
+    if octalEsc = /^(?:\\.|[^\\])*\\[0-7]/.test string
+      @error "octal escape sequences #{string} are not allowed"
     @line += count string, '\n'
     string.length
 

test/strict.coffee

@@ -31,11 +31,20 @@ test "Octal Integer Literals prohibited", ->
   strictOk  '`01`'
 
 test "Octal Escape Sequences prohibited", ->
-  strict    'e = "\\01"'
-  strict    'e = "\\0777"'
-  strictOk  'e = "\\09"'
-  strictOk  'e = "\\07777"'
-  strictOk  "e = `'\033[0;1m'`"
+  strict    '"\\0"'
+  strict    '"\\7"'
+  strict    '"\\000"'
+  strict    '"\\777"'
+  strict    '"_\\0"'
+  strict    '"\\0_"'
+  strict    '"_\\0_"'
+  strict    '"\\08"'
+  strict    '"\\\\\\0"'
+  strictOk  '"\\8"'
+  strictOk  '"\\\\0"'
+  strictOk  '"\\\\\\\\0"'
+  strictOk  "`'\\0'`"
+  
 
 test "duplicate property definitions in `Object Literal`s are prohibited", ->
   strict 'o = {x:1,x:1}'