Merge pull request #29 from kianmeng/fix-typos

Fix typos

Author: erszcz

lib/gradient/ast_specifier.ex

@@ -71,7 +71,7 @@ defmodule Gradient.AstSpecifier do
       run_mappers(forms, tokens)
     else
       error ->
-        IO.puts("Error occured when specifying forms : #{inspect(error)}")
+        IO.puts("Error occurred when specifying forms : #{inspect(error)}")
         forms
     end
   end
@@ -414,7 +414,7 @@ defmodule Gradient.AstSpecifier do
 
   def mapper({type, 0, value}, tokens, opts)
       when type in [:atom, :char, :float, :integer, :string, :bin] do
-    # TODO check what happend for :string
+    # TODO check what happened for :string
     {:ok, line} = Keyword.fetch(opts, :line)
 
     {type, line, value}

lib/gradient/elixir_expr.ex

@@ -186,7 +186,7 @@ defmodule Gradient.ElixirExpr do
   def pp_expr({:b_generate, _, pattern, expr}) do
     # drop >> to insert quantifier before
     ppatern = String.slice(pp_expr(pattern), 0..-3)
-    # add a space before >> for a case whan expr is a bin
+    # add a space before >> for a case when expr is a bin
     ppatern <> " <- " <> pp_expr(expr) <> " >>"
   end