Merge pull request #37 from sirsean/parse-time

Time parsing.

item.go

@@ -3,6 +3,7 @@ package feeder
 import (
 	"crypto/md5"
 	"io"
+	"time"
 )
 
 type Item struct {
@@ -27,6 +28,10 @@ type Item struct {
 	Extensions map[string]map[string][]Extension
 }
 
+func (i *Item) ParsedPubDate() (time.Time, error) {
+	return parseTime(i.PubDate)
+}
+
 func (i *Item) Key() string {
 	switch {
 	case i.Guid != nil && len(*i.Guid) != 0:

timeparser.go

@@ -0,0 +1,35 @@
+package feeder
+
+import (
+	"strings"
+	"time"
+)
+
+func parseTime(formatted string) (time.Time, error) {
+	var layouts = [...]string{
+		"Mon, _2 Jan 2006 15:04:05 MST",
+		"Mon, _2 Jan 2006 15:04:05 -0700",
+		time.ANSIC,
+		time.UnixDate,
+		time.RubyDate,
+		time.RFC822,
+		time.RFC822Z,
+		time.RFC850,
+		time.RFC1123,
+		time.RFC1123Z,
+		time.RFC3339,
+		time.RFC3339Nano,
+		"Mon, 2, Jan 2006 15:4",
+		"02 Jan 2006 15:04:05 MST",
+	}
+	var t time.Time
+	var err error
+	formatted = strings.TrimSpace(formatted)
+	for _, layout := range layouts {
+		t, err = time.Parse(layout, formatted)
+		if !t.IsZero() {
+			break
+		}
+	}
+	return t, err
+}

timeparser_test.go

@@ -0,0 +1,94 @@
+package feeder
+
+import (
+	"testing"
+	"time"
+)
+
+func Test_InvalidDate(t *testing.T) {
+	date, err := parseTime("invalid")
+	if !date.IsZero() {
+		t.Errorf("Invalid date should parse to zero")
+	}
+	if err == nil {
+		t.Errorf("error should not be nil")
+	}
+}
+
+func Test_ParseLayout0(t *testing.T) {
+	date, err := parseTime("2014-03-07T05:38:00-05:00")
+	expected := time.Date(2014, time.March, 7, 5, 38, 0, 0, time.FixedZone("-0500", -18000))
+	assertEqualTime(t, expected, date)
+	if err != nil {
+		t.Errorf("err should be nil")
+	}
+}
+
+func Test_ParseLayout1(t *testing.T) {
+	date, err := parseTime("Fri, 07 Mar 2014 17:42:51 GMT")
+	expected := time.Date(2014, time.March, 7, 17, 42, 51, 0, time.UTC)
+	assertEqualTime(t, expected, date)
+	if err != nil {
+		t.Errorf("err should be nil")
+	}
+}
+
+func Test_ParseLayout2(t *testing.T) {
+	date, err := parseTime("2014-02-05T23:33:34Z")
+	expected := time.Date(2014, time.February, 5, 23, 33, 34, 0, time.UTC)
+	assertEqualTime(t, expected, date)
+	if err != nil {
+		t.Errorf("err should be nil")
+	}
+}
+
+func Test_ParseLayout3(t *testing.T) {
+	date, err := parseTime("Mon, 03 Mar 2014 02:12:25 +0000")
+	expected := time.Date(2014, time.March, 3, 2, 12, 25, 0, time.UTC)
+	assertEqualTime(t, expected, date)
+	if err != nil {
+		t.Errorf("err should be nil")
+	}
+}
+
+func Test_ParseLayout4(t *testing.T) {
+	date, err := parseTime("Fri, 21, Mar 2014 10:41")
+	expected := time.Date(2014, time.March, 21, 10, 41, 0, 0, time.UTC)
+	assertEqualTime(t, expected, date)
+	if err != nil {
+		t.Errorf("err should be nil")
+	}
+}
+
+func Test_ParseLayout4_1(t *testing.T) {
+	date, err := parseTime("Fri, 17, Jan 2014 11:1")
+	expected := time.Date(2014, time.January, 17, 11, 1, 0, 0, time.UTC)
+	assertEqualTime(t, expected, date)
+	if err != nil {
+		t.Errorf("err should be nil")
+	}
+}
+
+func Test_ParseLayout4_2(t *testing.T) {
+	date, err := parseTime("Thu, 9, Jan 2014 10:19")
+	expected := time.Date(2014, time.January, 9, 10, 19, 0, 0, time.UTC)
+	assertEqualTime(t, expected, date)
+	if err != nil {
+		t.Errorf("err should be nil")
+	}
+}
+
+func Test_ParseLayout5(t *testing.T) {
+	date, err := parseTime("22 Jul 2013 14:55:01 EST")
+	expected := time.Date(2013, time.July, 22, 14, 55, 1, 0, time.FixedZone("EST", -18000))
+	assertEqualTime(t, expected, date)
+	if err != nil {
+		t.Errorf("err should be nil")
+	}
+}
+
+func assertEqualTime(t *testing.T, expected, actual time.Time) {
+	if !expected.Equal(actual) {
+		t.Errorf("expected %v but was %v", expected, actual)
+	}
+}