3 files changed, 14 insertions, 15 deletions

diff --git a/lua/cjson/util.lua b/lua/cjson/util.lua
index 5b1eba0..79245b5 100644
--- a/lua/cjson/util.lua
+++ b/lua/cjson/util.lua
@@ -63,10 +63,9 @@ local function serialise_table(value, indent, depth)
             if comma then
                 table.insert(fragment, "," .. spacing2)
             end
-            table.insert(fragment, string.format(
-                "[%s] = %s", serialise_value(k, indent2, depth),
-                             serialise_value(v, indent2, depth))
-            )
+            table.insert(fragment,
+                ("[%s] = %s"):format(serialise_value(k, indent2, depth),
+                                     serialise_value(v, indent2, depth)))
             comma = true
         end
     end
@@ -82,7 +81,7 @@ function serialise_value(value, indent, depth)
     if value == json.null then
         return "json.null"
     elseif type(value) == "string" then
-        return string.format("%q", value)
+        return ("%q"):format(value)
     elseif type(value) == "nil" or type(value) == "number" or
            type(value) == "boolean" then
         return tostring(value)
@@ -101,7 +100,7 @@ local function file_load(filename)
         local err
         file, err = io.open(filename)
         if file == nil then
-            error(string.format("Unable to read '%s': %s", filename, err))
+            error(("Unable to read '%s': %s"):format(filename, err))
         end
     end
     local data = file:read("*a")
@@ -125,7 +124,7 @@ local function file_save(filename, data)
         local err
         file, err = io.open(filename, "w")
         if file == nil then
-            error(string.format("Unable to write '%s': %s", filename, err))
+            error(("Unable to write '%s': %s"):format(filename, err))
         end
     end
     file:write(data)
@@ -187,7 +186,7 @@ local function run_test(testname, func, input, should_work, output)
         if status ~= nil then
             name = name .. statusmap[status]
         end
-        print(string.format("[%s] %s", name, serialise_value(value, false)))
+        print(("[%s] %s"):format(name, serialise_value(value, false)))
     end
 
     local result = { pcall(func, unpack(input)) }
@@ -201,8 +200,8 @@ local function run_test(testname, func, input, should_work, output)
     test_count_total = test_count_total + 1
 
     local teststatus = { [true] = "PASS", [false] = "FAIL" }
-    print(string.format("==> Test [%d] %s: %s",
-        test_count_total, testname, teststatus[correct]))
+    print(("==> Test [%d] %s: %s"):format(test_count_total, testname,
+                                          teststatus[correct]))
 
     status_line("Input", nil, input)
     if not correct then
diff --git a/tests/bench.lua b/tests/bench.lua
index cae4902..648020b 100755
--- a/tests/bench.lua
+++ b/tests/bench.lua
@@ -115,7 +115,7 @@ function bench_file(filename)
 end
 
 -- Optionally load any custom configuration required for this module
-local success, data = pcall(util.file_load, string.format("bench-%s.lua", json_module))
+local success, data = pcall(util.file_load, ("bench-%s.lua"):format(json_module))
 if success then
     util.run_script(data, _G)
     configure(json)
@@ -124,7 +124,7 @@ end
 for i = 1, #arg do
     local results = bench_file(arg[i])
     for k, v in pairs(results) do
-        print(string.format("%s\t%s\t%d", arg[i], k, v))
+        print(("%s\t%s\t%d"):format(arg[i], k, v))
     end
 end
 
diff --git a/tests/test.lua b/tests/test.lua
index e0f99f6..8c50b02 100755
--- a/tests/test.lua
+++ b/tests/test.lua
@@ -22,7 +22,7 @@ local function gen_utf16_escaped()
     local count = 0
 
     local function append_escape(code)
-        local esc = string.format('\\u%04X', code)
+        local esc = ('\\u%04X'):format(code)
         table.insert(utf16_escaped, esc)
     end
 
@@ -388,7 +388,7 @@ local cjson_tests = {
       true, { false, 2, 10 } },
 }
 
-print(string.format("==> Testing Lua CJSON version %s\n", json._VERSION))
+print(("==> Testing Lua CJSON version %s\n"):format(json._VERSION))
 
 util.run_test_group(cjson_tests)
 
@@ -402,7 +402,7 @@ local pass, total = util.run_test_summary()
 if pass == total then
     print("==> Summary: all tests succeeded")
 else
-    print(string.format("==> Summary: %d/%d tests failed", total - pass, total))
+    print(("==> Summary: %d/%d tests failed"):format(total - pass, total))
     os.exit(1)
 end