Fix pure parser with unclosed arrays / objects [Fix #314]

lib/json/pure/parser.rb

@@ -242,8 +242,10 @@ def parse_array
           @max_nesting.nonzero? && @current_nesting > @max_nesting
         result = @array_class.new
         delim = false
-        until eos?
+        loop do
           case
+          when eos?
+            raise ParserError, "unexpected end of string while parsing array"
           when !UNPARSED.equal?(value = parse_value)
             delim = false
             result << value
@@ -274,8 +276,10 @@ def parse_object
           @max_nesting.nonzero? && @current_nesting > @max_nesting
         result = @object_class.new
         delim = false
-        until eos?
+        loop do
           case
+          when eos?
+            raise ParserError, "unexpected end of string while parsing object"
           when !UNPARSED.equal?(string = parse_string)
             skip(IGNORE)
             unless scan(PAIR_DELIMITER)

tests/fixtures/fail29.json

@@ -0,0 +1 @@
+{

tests/fixtures/fail30.json

@@ -0,0 +1 @@
+[

tests/fixtures/fail31.json

@@ -0,0 +1 @@
+[1, 2, 3,

tests/fixtures/fail32.json

@@ -0,0 +1 @@
+{"foo": "bar"