rename flags for standard libraries

README.md

@@ -36,6 +36,28 @@ Quickjs.evalCode('const obj = {}; obj.missingKey;') # => :undefined (Quickjs::Va
 Quickjs.evalCode("Number('whatever')") #=> :NaN (Quickjs::Value::NAN)
 ```
 
+#### Limit resources
+
+```rb
+# 1GB memory limit
+Quickjs.evalCode(code, { memoryLimit: 1024 ** 3 })
+
+# 1MB max stack size
+Quickjs.evalCode(code, { memoryLimit: 1024 ** 2 })
+```
+
+#### Enable built-in modules
+
+```rb
+# enable std module
+# https://bellard.org/quickjs/quickjs.html#std-module
+Quickjs.evalCode(code, { features: [Quickjs::MODULE_STD] })
+
+# enable os module
+# https://bellard.org/quickjs/quickjs.html#os-module
+Quickjs.evalCode(code, { features: [Quickjs::MODULE_OS] })
+```
+
 ## License
 
 Every file in `ext/quickjsrb/quickjs` is licensed under [the MIT License Copyright 2017-2021 by Fabrice Bellard and Charlie Goron](/ext/quickjsrb/quickjs/LICENSE).

lib/quickjs.rb

@@ -5,8 +5,8 @@
 require_relative "quickjs/quickjsrb"
 
 module Quickjs
-  FEATURE_STD = :std
-  FEATURE_OS = :os
+  MODULE_STD = :std
+  MODULE_OS = :os
 
   def evalCode(
     code,
@@ -21,8 +21,8 @@ def evalCode(
       code,
       opts[:memoryLimit] || 1024 * 1024 * 128,
       opts[:maxStackSize] || 1024 * 1024 * 4,
-      opts[:features].include?(Quickjs::FEATURE_STD),
-      opts[:features].include?(Quickjs::FEATURE_OS),
+      opts[:features].include?(Quickjs::MODULE_STD),
+      opts[:features].include?(Quickjs::MODULE_OS),
     )
   end
   module_function :evalCode

test/quickjs_test.rb

@@ -61,11 +61,11 @@ class QuickjsTestFeatures < Test::Unit::TestCase
     end
 
     test "std can be enabled" do
-      assert_equal(::Quickjs.evalCode("!!std.urlGet", { features: [::Quickjs::FEATURE_STD] }), true)
+      assert_equal(::Quickjs.evalCode("!!std.urlGet", { features: [::Quickjs::MODULE_STD] }), true)
     end
 
     test "os can be enabled" do
-      assert_equal(::Quickjs.evalCode("!!os.kill", { features: [::Quickjs::FEATURE_OS] }), true)
+      assert_equal(::Quickjs.evalCode("!!os.kill", { features: [::Quickjs::MODULE_OS] }), true)
     end
   end
 end