From 96f3e71a69e3225c884a52831d0b15a2612f53c6 Mon Sep 17 00:00:00 2001
From: hjpalpha <75081997+hjpalpha@users.noreply.github.com>
Date: Thu, 12 Oct 2023 19:36:50 +0200
Subject: [PATCH] Add `Json.stringifySubTables` (#3345)

* Add `Json.stringifySubTables`

* testcases for new function

* adjust comment
---
 standard/json.lua           | 16 ++++++++++++++++
 standard/test/json_test.lua |  7 +++++++
 2 files changed, 23 insertions(+)

diff --git a/standard/json.lua b/standard/json.lua
index 0a54b60c5be..263e0e9e497 100644
--- a/standard/json.lua
+++ b/standard/json.lua
@@ -26,6 +26,22 @@ function Json.stringify(obj, pretty)
 	return mw.text.jsonEncode(obj, pretty == true and mw.text.JSON_PRETTY or nil)
 end
 
+---Json-stringifies subtables of a given table.
+---@param obj table
+---@param pretty boolean?
+---@return table
+function Json.stringifySubTables(obj, pretty)
+	local objectWithStringifiedSubtables = {}
+	for key, item in pairs(obj) do
+		if type(item) == 'table' then
+			objectWithStringifiedSubtables[key] = Json.stringify(item, pretty)
+		else
+			objectWithStringifiedSubtables[key] = item
+		end
+	end
+
+	return objectWithStringifiedSubtables
+end
 
 ---Parses a given JSON encoded table to its table representation.
 ---If the parse fails it returns an empty table.
diff --git a/standard/test/json_test.lua b/standard/test/json_test.lua
index 9d42cce73b4..b8cfbc14649 100644
--- a/standard/test/json_test.lua
+++ b/standard/test/json_test.lua
@@ -44,4 +44,11 @@ function suite:testParseIfTable()
 	self:assertDeepEquals(nil, (Json.parseIfTable('banana')))
 end
 
+function suite:testStringifySubTables()
+	self:assertDeepEquals({}, Json.stringifySubTables{})
+	self:assertDeepEquals({abc = 'def'}, Json.stringifySubTables{abc = 'def'})
+	self:assertDeepEquals({abc = '["b","c"]'}, Json.stringifySubTables{abc = {'b', 'c'}})
+	self:assertDeepEquals({a = '{"d":1,"b":"c"}', e = 'f'}, Json.stringifySubTables{a = {b = 'c', d = 1}, e = 'f'})
+end
+
 return suite