Respect Coder depth

ext/json/ext/generator/generator.c

@@ -1549,7 +1549,7 @@ static VALUE cState_generate_new(int argc, VALUE *argv, VALUE self)
         .buffer = &buffer,
         .vstate = Qfalse,
         .state = state,
-        .depth = 0,
+        .depth = state->depth,
         .obj = obj,
         .func = generate_json
     };

java/src/json/ext/GeneratorState.java

@@ -259,14 +259,12 @@ public IRubyObject generate(ThreadContext context, IRubyObject obj) {
     @JRubyMethod
     public IRubyObject generate_new(ThreadContext context, IRubyObject obj, IRubyObject io) {
         GeneratorState newState = (GeneratorState)dup();
-        newState.resetDepth();
         return newState.generate(context, obj, io);
     }
 
     @JRubyMethod
     public IRubyObject generate_new(ThreadContext context, IRubyObject obj) {
         GeneratorState newState = (GeneratorState)dup();
-        newState.resetDepth();
         return newState.generate(context, obj, context.nil);
     }
 
@@ -504,10 +502,6 @@ public IRubyObject depth_set(IRubyObject vDepth) {
         return vDepth;
     }
 
-    public void resetDepth() {
-        depth = 0;
-    }
-
     private ByteList prepareByteList(ThreadContext context, IRubyObject value) {
         RubyString str = value.convertToString();
         if (str.getEncoding() != UTF8Encoding.INSTANCE) {

lib/json/truffle_ruby/generator.rb

@@ -352,10 +352,6 @@ def generate_new(obj, anIO = nil) # :nodoc:
           dup.generate(obj, anIO)
         end
 
-        private def initialize_copy(_orig)
-          @depth = 0
-        end
-
         # Handles @allow_nan, @buffer_initial_length, other ivars must be the default value (see above)
         private def generate_json(obj, buf)
           case obj

test/json/json_coder_test.rb

@@ -132,6 +132,11 @@ def test_json_coder_string_invalid_encoding
     assert_equal 2, calls
   end
 
+  def test_depth
+    coder = JSON::Coder.new(object_nl: "\n", array_nl: "\n", space: " ", indent: "  ", depth: 1)
+    assert_equal %({\n    "foo": 42\n  }), coder.dump(foo: 42)
+  end
+
   def test_nesting_recovery
     coder = JSON::Coder.new
     ary = []