add support for JrJackson (https://github.com/guyboertje/jrjackson), …

…conditionally bundle platform-dependent gems

Gemfile

@@ -3,7 +3,14 @@ source 'https://rubygems.org'
 
 gem 'json'
 gem 'json_pure'
-gem 'yajl-ruby', :require => 'yajl'
 gem 'active_support'
-gem 'oj'
+
+platforms :ruby do
+  gem 'yajl-ruby', :require => 'yajl'
+  gem 'oj'
+end
+
+platforms :jruby do
+  gem 'jrjackson'
+end
 

lib/rufus/json.rb

@@ -94,6 +94,19 @@ module Json
       ::Oj::ParseError }
   }
 
+  # https://github.com/guyboertje/jrjackson
+  #
+  JRJACKSON = {
+      :encode => lambda { |o, opts|
+        fix_raw_value(::JrJackson::Json.dump(syms_to_s(o))) },
+      :pretty_encode => lambda { |o|
+        fix_raw_value(::JrJackson::Json.dump(syms_to_s(o))) },
+      :decode => lambda { |s|
+        ::JrJackson::Json.load(s) },
+      :error => lambda {
+        ::JrJackson::ParseError }
+  }
+
   # The "raise an exception because there's no backend" backend
   #
   NONE = {
@@ -134,7 +147,9 @@ def self.load_backend(*order)
   #
   def self.detect_backend
 
-    @backend = if defined?(::Oj)
+    @backend = if defined?(::JrJackson)
+      JRJACKSON
+    elsif defined?(::Oj)
       OJ
     elsif defined?(::Yajl)
       YAJL
@@ -161,7 +176,7 @@ def self.has_backend?
   #
   def self.backend
 
-    %w[ yajl json active oj none ].find { |b|
+    %w[ yajl json active oj jrjackson none ].find { |b|
       Rufus::Json.const_get(b.upcase) == @backend
     }.to_sym
   end
@@ -177,7 +192,7 @@ def self.backend=(b)
       'yajl' => YAJL, 'yajl-ruby' => YAJL,
       'json' => JSON, 'json-pure' => JSON,
       'active' => ACTIVE, 'active-support' => ACTIVE,
-      'oj' => OJ, 'none' => NONE
+      'oj' => OJ, 'jrjackson' => JRJACKSON, 'none' => NONE
     }[b.to_s.gsub(/[_\/]/, '-')] if b.is_a?(String) or b.is_a?(Symbol)
 
     @backend = b
@@ -253,6 +268,20 @@ def self.syms_to_s(o)
     o.inject({}) { |h, (k, v)| h[k.to_s] = syms_to_s(v); h }
   end
 
+  # Used to handle parsers that do not support raw value encoding
+  # (i.e. JrJackson)
+  def self.fix_raw_value(o)
+    case o
+      when FalseClass, TrueClass, Fixnum, Float
+        o.to_s
+      when NilClass
+        'null'
+      else
+        o
+    end
+
+  end
+
   # Wraps parser errors during decode
   #
   class ParserError < StandardError; end

rufus-json.gemspec

@@ -16,7 +16,7 @@ Gem::Specification.new do |s|
   s.summary = 'One interface to various JSON ruby libs, with a preference for yajl.'
 
   s.description = %{
-One interface to various JSON ruby libs (yajl, oj, json, json_pure, json-jruby, active_support). Has a preference for yajl.
+One interface to various JSON ruby libs (yajl, oj, jrjackson, json, json_pure, json-jruby, active_support). Has a preference for yajl.
   }.strip
 
   #s.files = `git ls-files`.split("\n")
@@ -26,6 +26,7 @@ One interface to various JSON ruby libs (yajl, oj, json, json_pure, json-jruby,
     '*.gemspec', '*.txt', '*.rdoc', '*.md'
   ]
 
+  #s.add_development_dependency 'jrjackson'
   #s.add_development_dependency 'oj'
   #s.add_development_dependency 'json'
   #s.add_development_dependency 'json_pure'

test/backend_test.rb

@@ -59,8 +59,13 @@ def test_load_backend
 
     r = Rufus::Json.load_backend
 
-    assert_equal 'yajl', r
-    assert_equal :yajl, Rufus::Json.backend
+    if RUBY_PLATFORM == 'ruby'
+      assert_equal 'yajl', r
+      assert_equal :yajl, Rufus::Json.backend
+    elsif RUBY_PLATFORM == 'jruby'
+      assert_equal 'active_support', r
+      assert_equal :active, Rufus::Json.backend
+    end
   end
 
   def test_load_backend_with_different_order

test/do_test.rb

@@ -128,7 +128,7 @@ def test_pretty_encode
     s = Rufus::Json.pretty_encode(
       { 'a' => 'b', 'e' => [ 1, 2, 3 ], 'c' => { 'd' => true } })
 
-    assert(s.index("\n")) if JSON_LIB != 'active_support'
+    assert(s.index("\n")) if JSON_LIB != 'active_support' && JSON_LIB != 'jrjackson'  #no pretty encoding supported
   end
 end
 

test/test.rb

@@ -25,6 +25,7 @@ def do_test(command)
 
 LIBS = %w[ json active_support json/pure ]
 LIBS.concat %w[ yajl oj ] if RUBY_PLATFORM != 'java'
+LIBS.concat %w[ jrjackson ] if RUBY_PLATFORM == 'java'
 
 LIBS.each do |lib|
   do_test "export JSON=#{lib}; #{R} #{P}/do_test.rb"