Improve float scalar scanner

Previously, `+.inf` was not handled correctly. Additionally, the regexp
was checking for inf and NaN, even though these cases are handled earlier
in the condition. Added a few tests to ensure handling some missing
cases.

1 files changed, 12 insertions, 0 deletions

diff --git a/test/psych/test_scalar_scanner.rb b/test/psych/test_scalar_scanner.rb
index 1bd6488..ec67a33 100644
--- a/test/psych/test_scalar_scanner.rb
+++ b/test/psych/test_scalar_scanner.rb
@@ -66,6 +66,10 @@ module Psych
       assert_equal(1 / 0.0, ss.tokenize('.inf'))
     end
 
+    def test_scan_plus_inf
+      assert_equal(1 / 0.0, ss.tokenize('+.inf'))
+    end
+
     def test_scan_minus_inf
       assert_equal(-1 / 0.0, ss.tokenize('-.inf'))
     end
@@ -133,5 +137,13 @@ module Psych
       assert_equal 0x123456789abcdef, ss.tokenize('0x_12_,34,_56,_789abcdef')
       assert_equal 0x123456789abcdef, ss.tokenize('0x12_,34,_56,_789abcdef__')
     end
+
+    def test_scan_dot
+      assert_equal '.', ss.tokenize('.')
+    end
+
+    def test_scan_plus_dot
+      assert_equal '+.', ss.tokenize('+.')
+    end
   end
 end