Feature/#8 datetime (#152)

pkg/stdlib/datetime/lib.go

@@ -0,0 +1,9 @@
+package datetime
+
+import "github.com/MontFerret/ferret/pkg/runtime/core"
+
+func NewLib() map[string]core.Function {
+	return map[string]core.Function{
+		"NOW": Now,
+	}
+}

pkg/stdlib/datetime/now.go

@@ -0,0 +1,20 @@
+package datetime
+
+import (
+	"context"
+
+	"github.com/MontFerret/ferret/pkg/runtime/values"
+
+	"github.com/MontFerret/ferret/pkg/runtime/core"
+)
+
+// Now returns new DateTime object with Time equal to time.Now().
+// @returns (DateTime) - New DateTime object.
+func Now(_ context.Context, args ...core.Value) (core.Value, error) {
+	err := core.ValidateArgs(args, 0, 0)
+	if err != nil {
+		return values.None, err
+	}
+
+	return values.NewCurrentDateTime(), nil
+}

pkg/stdlib/datetime/now_test.go

@@ -0,0 +1,57 @@
+package datetime_test
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/MontFerret/ferret/pkg/runtime/core"
+	"github.com/MontFerret/ferret/pkg/runtime/values"
+	"github.com/MontFerret/ferret/pkg/stdlib/datetime"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+type testCase struct {
+	Name      string
+	Expected  core.Value
+	TimeArg   time.Time
+	Args      []core.Value
+	ShouldErr bool
+}
+
+func TestNow(t *testing.T) {
+	tcs := []*testCase{
+		&testCase{
+			Name:     "When too many arguments",
+			Expected: values.None,
+			Args: []core.Value{
+				values.NewCurrentDateTime(),
+			},
+			ShouldErr: true,
+		},
+	}
+
+	for _, tc := range tcs {
+		tc.Do(t)
+	}
+}
+
+func (tc *testCase) Do(t *testing.T) {
+	Convey(tc.Name, t, func() {
+		var expected core.Value
+
+		expected = values.NewDateTime(tc.TimeArg)
+
+		dt, err := datetime.Now(context.Background(), tc.Args...)
+
+		if tc.ShouldErr {
+			So(err, ShouldBeError)
+			expected = values.None
+		} else {
+			So(err, ShouldBeNil)
+		}
+
+		So(dt, ShouldEqual, expected)
+	})
+}

pkg/stdlib/strings/fmt_test.go

@@ -5,7 +5,6 @@ import (
 	"testing"
 
 	"github.com/MontFerret/ferret/pkg/runtime/core"
-
 	"github.com/MontFerret/ferret/pkg/runtime/values"
 	"github.com/MontFerret/ferret/pkg/stdlib/strings"
 	. "github.com/smartystreets/goconvey/convey"