add benchmarks

Author: tj

Makefile

@@ -5,4 +5,7 @@ test:
 		--reporter spec \
 		--bail
 
-.PHONY: test
+bench:
+	@./node_modules/.bin/matcha
+
+.PHONY: test bench

benchmark/index.js

@@ -0,0 +1,31 @@
+
+var bytes = require('bytes');
+var parse = require('..');
+var fs = require('fs');
+
+var small = fs.readFileSync('benchmark/small.css', 'utf8');
+var large = fs.readFileSync('benchmark/large.css', 'utf8');
+var huge = Array(8).join(large);
+
+function lines(str) {
+  return str.split(/\n/g).length;
+}
+
+console.log();
+console.log('  small : %s : %s lines', bytes(Buffer.byteLength(small)), lines(small));
+console.log('  large : %s : %s lines', bytes(Buffer.byteLength(large)), lines(large));
+console.log('   huge : %s : %s lines', bytes(Buffer.byteLength(huge)), lines(huge));
+
+suite('css parse', function(){
+  bench('small', function(){
+    parse(small)
+  })
+
+  bench('large', function(){
+    parse(large)
+  })
+
+  bench('huge', function(){
+    parse(huge)
+  })
+})