Replace Slime.Parser with parser generated from PEG (using neotoma)

.gitignore

@@ -3,3 +3,5 @@
 erl_crash.dump
 *.ez
 /bench/snapshots
+/src/slime_parser.peg
+/src/slime_parser.erl

config/config.exs

@@ -1,7 +1,5 @@
 use Mix.Config
 
-config :slime, :keep_lines, false
-
 if Mix.env == :test do
   config :slime, :attr_list_delims, %{"[" => "]", "(" => ")"}
   config :slime, :embedded_engines, %{

lib/slime.ex

@@ -9,7 +9,16 @@ defmodule Slime do
     @moduledoc """
     Syntax exception which may appear during parsing and compilation processes
     """
-    defexception message: "Syntax error in slime file"
+    defexception [:line, :line_number, :column, message: "Syntax error", source: "INPUT"]
+
+    def message(exception) do
+      """
+      #{exception.message}
+      #{exception.source}, Line #{exception.line_number}, Column #{exception.column}
+      #{exception.line}
+      #{String.duplicate(" ", exception.column - 1)}^
+      """
+    end
   end
 
   defdelegate render(slime),           to: Renderer

lib/slime/compiler.ex

@@ -38,13 +38,17 @@ defmodule Slime.Compiler do
     end
   end
   defp render_attribute(name, value) do
-    value = cond do
-              is_binary(value) -> value
-              is_list(value) -> Enum.join(value, " ")
-              true -> to_string(value)
-            end
+    if value == true do
+      " #{to_string(name)}"
+    else
+      value = cond do
+        is_binary(value) -> value
+        is_list(value) -> Enum.join(value, " ")
+        true -> to_string(value)
+      end
 
-    ~s( #{to_string(name)}="#{value}")
+      ~s( #{to_string(name)}="#{value}")
+    end
   end
 
   defp render_branch(%DoctypeNode{content: text}), do: text