Fix parsing dashes in css classes

Closes #12

lib/slim_fast/parser.ex

@@ -36,7 +36,7 @@ defmodule SlimFast.Parser do
   defp attribute_val(value), do: parse_eex(value, true)
 
   defp css_classes(input) do
-    css = ~r/\.([\w-]{1,})/
+    css = ~r/\.([\w-]+)/
           |> Regex.scan(input)
           |> Enum.flat_map(fn ([_|class]) -> class end)
 
@@ -108,7 +108,7 @@ defmodule SlimFast.Parser do
   end
 
   defp parse_line(_, line) do
-    parts = ~r/^\s*(?<tag>\w*(?:[#.]\w+)*)(?<attrs>(?:\s*[\w-]+\s*=(".+"|\w+))*)(?<tail>.*)/
+    parts = ~r/^\s*(?<tag>\w*(?:[#.][\w-]+)*)(?<attrs>(?:\s*[\w-]+\s*=(".+"|\w+))*)(?<tail>.*)/
             |> Regex.named_captures(line)
 
     {tag, basics} = parse_tag(line)

test/parser_test.exs

@@ -11,6 +11,13 @@ defmodule ParserTest do
     assert parsed == [{0, {:div, attributes: [class: ["class"], id: "id"], children: []}}, {2, {:p, attributes: [], children: ["Hello World"]}}]
   end
 
+  test "parses css classes with dashes" do
+    {_, {:div, opts}} = ".my-css-class test"
+                         |> Parser.parse_line
+
+    assert opts == [attributes: [class: ["my-css-class"]], children: ["test"]]
+  end
+
   test "parses attributes" do
     {_, {:meta, opts}} = "meta name=variable content=\"one two\""
                          |> Parser.parse_line