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[PATCH]v2 adding built-in driver for javascript

javascript is one of the famous langugae,it's needs a built-in driver. As it was not present in the userdiff & this leads to the patch.
	first line consists of some of the well used javascript keywords.statements in js use one or many keywords like variable declaration, function definition, logical opreation etc.The following line is for statements of type object.method() & it is expected to end any statement using ";". The word_regex in js is usual alpha-numeric.last two line shows all the different types of opreators in js and different types of number system used in js are also defined.     

Signed-off-by: sourav mondal <souravcristiano502@xxxxxxxxx>

I'm working on "Add more built-in driver for userdiff" as my microproject for Gsoc17. This patch is for javascript which is one of the popular language at this time. I'm willing to add more driver for other laguage that isn't present in userdiff.c and again I'm willing to participate in Gsoc17 with git. I'm eager to know about this patch.

thanks & regards
 userdiff.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/userdiff.c b/userdiff.c
index 8b732e4..2f8e078 100644
--- a/userdiff.c
+++ b/userdiff.c
@@ -160,6 +160,16 @@ IPATTERN("css",
 	 "-?[_a-zA-Z][-_a-zA-Z0-9]*" /* identifiers */
 	 "|-?[0-9]+|\\#[0-9a-fA-F]+" /* numbers */
+	 /* keywords/patterns*/
+	 "^[ \t]*(var|if|else|for|do|while|switch|case|function|break|continue|new|return|class|super|instanceof)"
+	 "^[ \t]*(([a-zA-Z_][a-zA-Z0-9])*[ \t]*\\.?[a-zA-Z_]*\\(\\)[ \t]*);$",
+	 /* word_regex */
+	 "[a-zA-Z_][a-zA-Z0-9]*"
+	 "|[-+0-9.eE]+|0[bB]?|[xX]?|o?[0-9a-fA-F]+"
+	 "|[==-+*/%<>&|!**=^]="
+	 "|--|\\+\\+|<<=?|>>>?=?|&&|\|\|"
 { "default", NULL, -1, { NULL, 0 } },
 #undef PATTERNS