Merge remote branch 'pbm/master'

* pbm/master:
  Fix problem with empty and white-space only strings. Add test.

2 files changed, 11 insertions, 2 deletions

diff --git a/lib/psych.rb b/lib/psych.rb
index 574bc7e..c142593 100644
--- a/lib/psych.rb
+++ b/lib/psych.rb
@@ -101,7 +101,8 @@ module Psych
   #   Psych.load("--- a")           # => 'a'
   #   Psych.load("---\n - a\n - b") # => ['a', 'b']
   def self.load yaml
-    parse(yaml).to_ruby
+    result = parse(yaml)
+    result ? result.to_ruby : result
   end
 
   ###
@@ -113,7 +114,8 @@ module Psych
   #
   # See Psych::Nodes for more information about YAML AST.
   def self.parse yaml
-    parse_stream(yaml).children.first.children.first
+    children = parse_stream(yaml).children
+    children.empty? ? false : children.first.children.first
   end
 
   ###
diff --git a/test/psych/test_psych.rb b/test/psych/test_psych.rb
index fce070f..88fe83c 100644
--- a/test/psych/test_psych.rb
+++ b/test/psych/test_psych.rb
@@ -66,4 +66,11 @@ class TestPsych < Psych::TestCase
 
     assert_equal 'hello world', Psych.parse_file(name).transform
   end
+
+  def test_degenerate_strings
+    assert_equal false, Psych.load('    ')
+    assert_equal false, Psych.parse('   ')
+    assert_equal false, Psych.load('')
+    assert_equal false, Psych.parse('')
+  end
 end