Added raw for adding raw css

src/main/groovy/org/groocss/Comment.groovy

@@ -0,0 +1,17 @@
+package org.groocss
+
+import groovy.transform.CompileStatic
+import groovy.transform.EqualsAndHashCode
+import groovy.transform.TupleConstructor
+
+/**
+ * Created by adavis on 8/9/17.
+ */
+@TupleConstructor
+@EqualsAndHashCode
+@CompileStatic
+class Comment {
+    String comment
+    boolean isEmpty() { comment == '' }
+    String toString() { "/**$comment*/" }
+}

src/main/groovy/org/groocss/GrooCSS.groovy

@@ -1738,4 +1738,10 @@ class GrooCSS extends Script {
         new PseudoClass(value)
     }
 
+    Raw raw(String raw) {
+        def r = new Raw(raw)
+        currentCss << r
+        r
+    }
+
 }

src/main/groovy/org/groocss/MediaCSS.groovy

@@ -11,8 +11,8 @@ class MediaCSS {
     /** List of @font-face elements. */
     List<FontFace> fonts = []
 
-    /** List of style groups. */
-    List<StyleGroup> groups = []
+    /** List of style groups, comments, raws. */
+    List groups = []
 
     /** List of @keyframes. */
     List<KeyFrames> kfs = []
@@ -28,23 +28,17 @@ class MediaCSS {
         this.config = config1
     }
 
-    MediaCSS leftShift(StyleGroup sg) { add sg; this }
-    MediaCSS add(StyleGroup sg) { groups << sg; this }
-    MediaCSS leftShift(KeyFrames kf) { add kf; this }
-    MediaCSS add(KeyFrames kf) { kfs << kf; this }
-    MediaCSS leftShift(FontFace ff) { add ff; this }
-    MediaCSS add(FontFace ff) { fonts << ff; this }
-
-    MediaCSS leftShift(MediaCSS mediaCSS) { add mediaCSS; this }
-    MediaCSS add(MediaCSS mediaCSS) { otherCss << mediaCSS; this }
+    MediaCSS leftShift(sg) { add sg }
+    MediaCSS add(it) {
+        if (it instanceof KeyFrames) kfs << ((KeyFrames) it)
+        else if (it instanceof FontFace) fonts << ((FontFace) it)
+        else if (it instanceof MediaCSS) otherCss << ((MediaCSS) it)
+        else groups << it
+        this
+    }
 
     MediaCSS add(Collection coll) {
-        coll.each {
-            if (it instanceof StyleGroup) add((StyleGroup) it)
-            if (it instanceof KeyFrames) add((KeyFrames) it)
-            if (it instanceof FontFace) add((FontFace) it)
-            if (it instanceof MediaCSS) add((MediaCSS) it)
-        }
+        coll.each {add(it)}
         this
     }
     MediaCSS addAll(Collection coll) { add(coll) }

src/main/groovy/org/groocss/Raw.groovy

@@ -0,0 +1,17 @@
+package org.groocss
+
+import groovy.transform.CompileStatic
+import groovy.transform.EqualsAndHashCode
+import groovy.transform.TupleConstructor
+
+/**
+ * Created by adavis on 8/9/17.
+ */
+@TupleConstructor
+@EqualsAndHashCode
+@CompileStatic
+class Raw {
+    String rawCss
+    boolean isEmpty() { rawCss == '' }
+    String toString() {rawCss}
+}

src/main/groovy/org/groocss/StyleGroup.groovy

@@ -97,7 +97,8 @@ class StyleGroup extends Selectable {
 
     /** Finds an existing StyleGroup with given selector and appends [comma selector] to its selector.*/
     StyleGroup extend(String otherSelector) {
-        StyleGroup other = owner.groups.find {it.selector == otherSelector}
+        StyleGroup other = owner.groups.findAll{it instanceof Selectable}.find{
+            ((Selectable) it).selector == otherSelector}
         if (other) other.extenders << this
         other
     }

src/test/groovy/org/groocss/RawSpec.groovy

@@ -0,0 +1,18 @@
+package org.groocss
+
+import spock.lang.Specification
+
+/**
+ * Created by adavis on 8/9/17.
+ */
+class RawSpec extends Specification {
+
+    def "raw should just include it"() {
+        given:
+        def css = GrooCSS.process {
+            raw '::webkit-blaw { dostuff }'
+        }
+        expect:
+        '::webkit-blaw { dostuff }' == "$css"
+    }
+}