Add preprocessors benchmark

.gitignore

@@ -2,6 +2,7 @@
 *~
 
 node_modules/
+.bundle/
 
 benchmark/results/
 benchmark/cache/

benchmark/Gemfile

@@ -0,0 +1,3 @@
+source "https://rubygems.org"
+
+gem 'sass'

benchmark/Gemfile.lock

@@ -0,0 +1,10 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    sass (3.4.8)
+
+PLATFORMS
+  ruby
+
+DEPENDENCIES
+  sass

benchmark/processors.js

@@ -0,0 +1,66 @@
+var fs   = require('fs');
+var exec = require('child_process').exec;
+
+var path = __dirname + '/cache/bootstrap.css';
+var css  = fs.readFileSync(path).toString();
+
+css = css.replace(/\s+filter:[^;\}]+;?/g, '');
+css = css.replace('/*# sourceMappingURL=bootstrap.css.map */', '');
+var scss = __dirname + '/cache/bootstrap.scss';
+fs.writeFileSync(scss, css);
+
+var postcss = require('../build');
+var stylus  = require('stylus');
+var sass    = require('node-sass');
+var less    = require('less');
+
+module.exports = {
+    name:   'Bootstrap',
+    maxTime: 15,
+    tests: [
+        {
+            name: 'PostCSS',
+            fn: function (done) {
+                return postcss().process(css, { map: false }).css;
+            }
+        },
+        {
+            name: 'Stylus',
+            defer: true,
+            fn: function (done) {
+                stylus.render(css, { filename: path }, function (err, css) {
+                    if ( err ) throw err;
+                    done.resolve();
+                });
+            }
+        },
+        {
+            name: 'Less',
+            defer: true,
+            fn: function (done) {
+                less.render(css, function (err, css) {
+                    if ( err ) throw err;
+                    done.resolve();
+                });
+            }
+        },
+        {
+            name: 'libsass',
+            fn: function () {
+                return sass.renderSync({ data: css });
+            }
+        },
+        {
+            name: 'Ruby Sass',
+            defer: true,
+            fn: function (done) {
+                var command = 'sass -C --sourcemap=none ' + scss;
+                exec('cd ' + __dirname + '; bundle exec ' + command,
+                     function (error, stdout, stderr) {
+                        if ( error ) throw stderr;
+                        done.resolve();
+                     });
+            }
+        }
+    ]
+};

gulpfile.js

@@ -95,10 +95,18 @@ gulp.task('bench:bootstrap', function (done) {
     });
 });
 
+gulp.task('bench:processors', ['build', 'bench:bootstrap'], function () {
+    var bench   = require('gulp-bench');
+    var summary = require('gulp-bench-summary');
+    return gulp.src('./benchmark/processors.js', { read: false })
+        .pipe(bench())
+        .pipe(summary('PostCSS'));
+});
+
 gulp.task('bench', ['build', 'bench:bootstrap'], function () {
     var bench   = require('gulp-bench');
     var summary = require('gulp-bench-summary');
-    return gulp.src('./benchmark/general.js', { read: false })
+    return gulp.src('./benchmark/parsers.js', { read: false })
         .pipe(bench())
         .pipe(summary('PostCSS'));
 });

package.json

@@ -12,7 +12,7 @@
     "dependencies": {
         "source-map": "~0.1.40",
         "js-base64":  "~2.1.5",
-        "6to5":       "1.12.26"
+        "6to5":       "1.13.11"
     },
     "devDependencies": {
         "concat-with-sourcemaps": "0.1.6",
@@ -25,6 +25,7 @@
         "gulp-mocha":             "2.0.0",
         "gulp-util":              "3.0.1",
         "gulp-6to5":              "1.0.2",
+        "node-sass":              "1.2.3",
         "execSync":               "1.0.2",
         "fs-extra":               "0.12.0",
         "gonzales":               "1.0.7",
@@ -34,9 +35,11 @@
         "rework":                 "1.0.1",
         "should":                 "4.3.0",
         "mensch":                 "0.3.1",
+        "stylus":                 "0.49.3",
         "mocha":                  "2.0.1",
         "cssom":                  "0.3.0",
-        "gulp":                   "3.8.10"
+        "gulp":                   "3.8.10",
+        "less":                   "2.1.0"
     },
     "scripts": {
         "test": "gulp"