Add Date,DateTime,Time parsers

Author: shellyln

extra/classes/classes.go

@@ -11,4 +11,7 @@ const (
 	DateStr          = ":extra:DateStr"
 	DateTimeStr      = ":extra:DateTimeStr"
 	TimeStr          = ":extra:TimeStr"
+	Date             = ":extra:Date"
+	DateTime         = ":extra:DateTime"
+	Time             = ":extra:Time"
 )

extra/transformers.go

@@ -0,0 +1,48 @@
+package extra
+
+import (
+	"time"
+
+	. "github.com/shellyln/takenoco/base"
+	clsz "github.com/shellyln/takenoco/extra/classes"
+)
+
+func ParseDate(ctx ParserContext, asts AstSlice) (AstSlice, error) {
+	value := asts[len(asts)-1].Value.(string)
+	t, err := time.Parse("2006-01-02", value)
+	if err != nil {
+		return nil, err
+	}
+	return AstSlice{{
+		ClassName: clsz.Date,
+		Type:      AstType_Any,
+		Value:     t.UTC(),
+	}}, nil
+}
+
+func ParseDateTime(ctx ParserContext, asts AstSlice) (AstSlice, error) {
+	// TODO: BUG: Cannot parse years with negative values or years greater than or equal to 10000.
+	value := asts[len(asts)-1].Value.(string)
+	t, err := time.Parse("2006-01-02T15:04:05.000000000-07:00", value)
+	if err != nil {
+		return nil, err
+	}
+	return AstSlice{{
+		ClassName: clsz.DateTime,
+		Type:      AstType_Any,
+		Value:     t.UTC(),
+	}}, nil
+}
+
+func ParseTime(ctx ParserContext, asts AstSlice) (AstSlice, error) {
+	value := "1970-01-01T" + asts[len(asts)-1].Value.(string) + "+00:00"
+	t, err := time.Parse("2006-01-02T15:04:05.000000000-07:00", value)
+	if err != nil {
+		return nil, err
+	}
+	return AstSlice{{
+		ClassName: clsz.Time,
+		Type:      AstType_Any,
+		Value:     t.UTC(),
+	}}, nil
+}