added [] method to State objects

Author: flori

CHANGES

@@ -1,3 +1,6 @@
+2010-03-11 (1.2.3)
+  * Added a State#[] method which returns an attribute's value in order to
+    increase duck type compatibility to Hash.
 2010-02-27 (1.2.2)
   * Made some changes to make the building of the parser/generator compatible
     to Rubinius.

VERSION

@@ -1 +1 @@
-1.2.2
+1.2.3

ext/json/ext/generator/generator.c

@@ -41,7 +41,8 @@ static VALUE mJSON, mExt, mGenerator, cState, mGeneratorMethods, mObject,
 
 static ID i_to_s, i_to_json, i_new, i_indent, i_space, i_space_before,
           i_object_nl, i_array_nl, i_check_circular, i_max_nesting,
-          i_allow_nan, i_pack, i_unpack, i_create_id, i_extend, i_key_p;
+          i_allow_nan, i_pack, i_unpack, i_create_id, i_extend, i_key_p,
+          i_aref, i_send, i_respond_to_p;
 
 typedef struct JSON_Generator_StateStruct {
     VALUE indent;
@@ -584,6 +585,20 @@ static VALUE cState_to_h(VALUE self)
     return result;
 }
 
+/*
+ * call-seq: [](name)
+ *
+ * Return the value returned by method +name+.
+ */
+static VALUE cState_aref(VALUE self, VALUE name)
+{
+    GET_STATE(self);
+    if (RTEST(rb_funcall(self, i_respond_to_p, 1, name))) {
+        return rb_funcall(self, i_send, 1, name);
+    } else {
+        return Qnil;
+    }
+}
 
 /*
  * call-seq: new(opts = {})
@@ -884,6 +899,7 @@ void Init_generator()
     rb_define_method(cState, "forget", cState_forget, 1);
     rb_define_method(cState, "configure", cState_configure, 1);
     rb_define_method(cState, "to_h", cState_to_h, 0);
+    rb_define_method(cState, "[]", cState_aref, 1);
 
     mGeneratorMethods = rb_define_module_under(mGenerator, "GeneratorMethods");
     mObject = rb_define_module_under(mGeneratorMethods, "Object");
@@ -926,6 +942,9 @@ void Init_generator()
     i_create_id = rb_intern("create_id");
     i_extend = rb_intern("extend");
     i_key_p = rb_intern("key?");
+    i_aref = rb_intern("[]");
+    i_send = rb_intern("__send__");
+    i_respond_to_p = rb_intern("respond_to?");
 #ifdef HAVE_RUBY_ENCODING_H
     mEncoding_UTF_8 = rb_funcall(rb_path2class("Encoding"), rb_intern("find"), 1, rb_str_new2("utf-8"));
     i_encoding = rb_intern("encoding");

lib/json/pure/generator.rb

@@ -217,6 +217,11 @@ def to_h
           end
           result
         end
+
+        # Return the value returned by method +name+.
+        def [](name)
+          __send__ name
+        end
       end
 
       module GeneratorMethods

lib/json/version.rb

@@ -1,6 +1,6 @@
 module JSON
   # JSON version
-  VERSION         = '1.2.2'
+  VERSION         = '1.2.3'
   VERSION_ARRAY   = VERSION.split(/\./).map { |x| x.to_i } # :nodoc:
   VERSION_MAJOR   = VERSION_ARRAY[0] # :nodoc:
   VERSION_MINOR   = VERSION_ARRAY[1] # :nodoc:

tests/test_json_generate.rb

@@ -88,13 +88,15 @@ def test_states
     json = generate({1=>2}, nil)
     assert_equal('{"1":2}', json)
     s = JSON.state.new(:check_circular => true)
-    #assert s.check_circular
+    assert s.check_circular?
+    assert s[:check_circular?]
     h = { 1=>2 }
     h[3] = h
     assert_raises(JSON::CircularDatastructure) {  generate(h) }
     assert_raises(JSON::CircularDatastructure) {  generate(h, s) }
     s = JSON.state.new(:check_circular => true)
-    #assert s.check_circular
+    assert s.check_circular?
+    assert s[:check_circular?]
     a = [ 1, 2 ]
     a << a
     assert_raises(JSON::CircularDatastructure) {  generate(a, s) }