Landing pull request 523. Adds character frequency reporting tool, us…

…e: make freq. Fixes #10372.

More Details:
 - #523
 - http://bugs.jquery.com/ticket/10372

Makefile

@@ -83,6 +83,13 @@ size: jquery min
 		echo "You must have NodeJS installed in order to size jQuery."; \
 	fi
 
+freq: jquery min
+	@@if test ! -z ${JS_ENGINE}; then \
+		${JS_ENGINE} ${BUILD_DIR}/freq.js; \
+	else \
+		echo "You must have NodeJS installed to report the character frequency of minified jQuery."; \
+	fi
+
 min: jquery ${JQ_MIN}
 
 ${JQ_MIN}: ${JQ}

build/freq.js

@@ -0,0 +1,79 @@
+#! /usr/bin/env node
+
+var fs = require( "fs" );
+
+function isEmptyObject( obj ) {
+	for ( var name in obj ) {
+		return false;
+	}
+	return true;
+}
+function extend( obj ) {
+	var dest = obj,
+	src = [].slice.call( arguments, 1 );
+
+	Object.keys( src ).forEach(function( key ) {
+		var copy = src[ key ];
+
+		for ( var prop in copy ) {
+			dest[ prop ] = copy[ prop ];
+		}
+	});
+
+	return dest;
+};
+
+function charSort( obj, callback ) {
+
+	var ordered = [],
+		table = {},
+		copied;
+
+	copied = extend({}, obj );
+
+	(function order() {
+
+		var largest = 0,
+				c;
+
+		for ( var i in obj ) {
+			if ( obj[ i ] >= largest ) {
+				largest = obj[ i ];
+				c = i;
+			}
+		}
+
+		ordered.push( c );
+		delete obj[ c ];
+
+		if ( !isEmptyObject( obj ) ) {
+			order();
+		} else {
+			ordered.forEach(function( val ) {
+				table[ val ] = copied[ val ];
+			});
+
+			callback( table );
+		}
+
+	})();
+}
+function charFrequency( src, callback ) {
+	var obj = {};
+
+	src.replace(/[^\w]|\d/gi, "").split("").forEach(function( c ) {
+		obj[ c ] ? ++obj[ c ] : ( obj[ c ] = 1 );
+	});
+
+	return charSort( obj, callback );
+}
+
+
+charFrequency( fs.readFileSync( "dist/jquery.min.js", "utf8" ), function( obj ) {
+	var chr;
+
+	for ( chr in obj ) {
+		console.log( "  " + chr + "   " + obj[ chr ] );
+	}
+});
+