fix for pretty_generate throwing wrong number of arguments error

Author: Cody Horton

CHANGES.md

@@ -2,6 +2,8 @@
 
 ### Unreleased
 
+* Fix for JSON.pretty_generate to use passed state object's generate instead of state class as the required parameters aren't available.
+
 ### 2025-05-12 (2.12.0)
 
 * Improve floating point generation to not use scientific notation as much.

lib/json/common.rb

@@ -490,7 +490,7 @@ def fast_generate(obj, opts = nil)
   #   }
   #
   def pretty_generate(obj, opts = nil)
-    return state.generate(obj) if State === opts
+    return opts.generate(obj) if State === opts
 
     options = PRETTY_GENERATE_OPTIONS
 

test/json/json_generator_test.rb

@@ -122,6 +122,22 @@ def test_generate_pretty
     assert_equal '666', pretty_generate(666)
   end
 
+  def test_generate_pretty_custom
+    state = State.new(:space_before => "<psb>", :space => "<ps>", :indent => "<pi>", :object_nl => "\n<po_nl>\n", :array_nl => "<pa_nl>")
+    json = pretty_generate({1=>{}, 2=>['a','b'], 3=>4}, state)
+    assert_equal(<<~'JSON'.chomp, json)
+      {
+      <po_nl>
+      <pi>"1"<psb>:<ps>{},
+      <po_nl>
+      <pi>"2"<psb>:<ps>[<pa_nl><pi><pi>"a",<pa_nl><pi><pi>"b"<pa_nl><pi>],
+      <po_nl>
+      <pi>"3"<psb>:<ps>4
+      <po_nl>
+      }
+    JSON
+  end
+
   def test_generate_custom
     state = State.new(:space_before => " ", :space => "   ", :indent => "<i>", :object_nl => "\n", :array_nl => "<a_nl>")
     json = generate({1=>{2=>3,4=>[5,6]}}, state)