FEATURE: add support for activesupport dates

ext/mini_racer_extension/mini_racer_extension.c

@@ -604,6 +604,20 @@ static int serialize1(Ser *s, VALUE refs, VALUE v)
     case T_STRING:
         add_string(s, v);
         break;
+    case T_OBJECT:
+        // this is somewhat wide, but we have active support which creates
+        // entirely new objects
+        if (rb_respond_to(v, rb_intern("to_time"))) {
+            v = rb_funcall(v, rb_intern("to_time"), 0);
+        }
+        if (rb_obj_is_kind_of(v, rb_cTime)) {
+            struct timeval tv = rb_time_timeval(v);
+            ser_date(s, tv.tv_sec*1e3 + tv.tv_usec/1e3);
+        } else {
+	    snprintf(s->err, sizeof(s->err), "unsupported type %s", rb_class2name(CLASS_OF(v)));
+	    return -1;
+        }
+        break;
     default:
         snprintf(s->err, sizeof(s->err), "unsupported type %x", TYPE(v));
         return -1;

mini_racer.gemspec

@@ -39,6 +39,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake", ">= 12.3.3"
   spec.add_development_dependency "minitest", "~> 5.0"
   spec.add_development_dependency "rake-compiler"
+  spec.add_development_dependency "activesupport", "> 6"
   spec.add_development_dependency "m"
 
   spec.add_dependency "libv8-node", MiniRacer::LIBV8_NODE_VERSION

test/mini_racer_test.rb

@@ -262,9 +262,7 @@ def test_return_hash
   def test_date_nan
     # NoMethodError: undefined method `source_location' for "<internal:core>
     # core/float.rb:114:in `to_i'":Thread::Backtrace::Location
-    if RUBY_ENGINE == "truffleruby"
-      skip "TruffleRuby bug"
-    end
+    skip "TruffleRuby bug" if RUBY_ENGINE == "truffleruby"
     context = MiniRacer::Context.new
     assert_raises(RangeError) { context.eval("new Date(NaN)") } # should not crash process
   end
@@ -893,11 +891,14 @@ def test_wasm_ref
     end
     context = MiniRacer::Context.new
     expected = {}
-    actual = context.eval("
+    actual =
+      context.eval(
+        "
       var b = [0,97,115,109,1,0,0,0,1,26,5,80,0,95,0,80,0,95,1,127,0,96,0,1,110,96,1,100,2,1,111,96,0,1,100,3,3,4,3,3,2,4,7,26,2,12,99,114,101,97,116,101,83,116,114,117,99,116,0,1,7,114,101,102,70,117,110,99,0,2,9,5,1,3,0,1,0,10,23,3,8,0,32,0,20,2,251,27,11,7,0,65,12,251,0,1,11,4,0,210,0,11,0,44,4,110,97,109,101,1,37,3,0,11,101,120,112,111,114,116,101,100,65,110,121,1,12,99,114,101,97,116,101,83,116,114,117,99,116,2,7,114,101,102,70,117,110,99]
       var o = new WebAssembly.Instance(new WebAssembly.Module(new Uint8Array(b))).exports
       o.refFunc()(o.createStruct) // exotic object
-    ")
+    "
+      )
     assert_equal expected, actual
   end
 
@@ -923,7 +924,7 @@ def test_proxy_support
 
   def test_proxy_uncloneable
     context = MiniRacer::Context.new()
-    expected = {"x" => 42}
+    expected = { "x" => 42 }
     assert_equal expected, context.eval(<<~JS)
       const o = {x: 42}
       const p = new Proxy(o, {})
@@ -1031,9 +1032,7 @@ def test_forking
       skip "TruffleRuby forking is not supported"
     else
       `bundle exec ruby test/test_forking.rb`
-      if $?.exitstatus != 0
-        assert false, "forking test failed"
-      end
+      assert false, "forking test failed" if $?.exitstatus != 0
     end
   end
 
@@ -1053,19 +1052,22 @@ def test_poison
 
   def test_map
     context = MiniRacer::Context.new
-    expected = {"x" => 42, "y" => 43}
+    expected = { "x" => 42, "y" => 43 }
     assert_equal expected, context.eval("new Map([['x', 42], ['y', 43]])")
     if RUBY_ENGINE == "truffleruby"
       # See https://github.com/rubyjs/mini_racer/pull/325#discussion_r1907187166
       expected = [["x", 42], ["y", 43]]
     else
       expected = ["x", 42, "y", 43]
     end
-    assert_equal expected, context.eval("new Map([['x', 42], ['y', 43]]).entries()")
-    expected = ["x", "y"]
-    assert_equal expected, context.eval("new Map([['x', 42], ['y', 43]]).keys()")
+    assert_equal expected,
+                 context.eval("new Map([['x', 42], ['y', 43]]).entries()")
+    expected = %w[x y]
+    assert_equal expected,
+                 context.eval("new Map([['x', 42], ['y', 43]]).keys()")
     expected = [[42], [43]]
-    assert_equal expected, context.eval("new Map([['x', [42]], ['y', [43]]]).values()")
+    assert_equal expected,
+                 context.eval("new Map([['x', [42]], ['y', [43]]]).values()")
   end
 
   def test_regexp_string_iterator
@@ -1083,17 +1085,9 @@ def test_regexp_string_iterator
   def test_function_property
     context = MiniRacer::Context.new
     if RUBY_ENGINE == "truffleruby"
-      expected = {
-        "m" => {1 => 2, 3 => 4},
-        "s" => {},
-        "x" => 42,
-      }
+      expected = { "m" => { 1 => 2, 3 => 4 }, "s" => {}, "x" => 42 }
     else
-      expected = {
-        "m" => {1 => 2, 3 => 4},
-        "s" => [5, 7, 11, 13],
-        "x" => 42,
-      }
+      expected = { "m" => { 1 => 2, 3 => 4 }, "s" => [5, 7, 11, 13], "x" => 42 }
     end
     script = <<~JS
       ({
@@ -1106,6 +1100,16 @@ def test_function_property
     assert_equal expected, context.eval(script)
   end
 
+  def test_dates_from_active_support
+    require "active_support"
+    require "active_support/time"
+    context = MiniRacer::Context.new
+    Time.zone = "UTC"
+    time = Time.current
+    context.attach("f", proc { time })
+    assert_in_delta time.to_f, context.call("f").to_f, 0.001
+  end
+
   def test_string_encoding
     context = MiniRacer::Context.new
     assert_equal "ä", context.eval("'ä'")
@@ -1124,7 +1128,7 @@ def test_object_ref
     context = MiniRacer::Context.new
     context.eval("function f(o) { return o }")
     expected = {}
-    expected["a"] = expected["b"] = {"x" => 42}
+    expected["a"] = expected["b"] = { "x" => 42 }
     actual = context.call("f", expected)
     assert_equal actual, expected
   end