refactor: move time related functions to a separate file

Signed-off-by: Mark Sagi-Kazar <mark.sagikazar@gmail.com>

caste.go

@@ -26,79 +26,6 @@ type float64Provider interface {
 	Float64() float64
 }
 
-// ToTimeE casts an interface to a time.Time type.
-func ToTimeE(i interface{}) (tim time.Time, err error) {
-	return ToTimeInDefaultLocationE(i, time.UTC)
-}
-
-// ToTimeInDefaultLocationE casts an empty interface to time.Time,
-// interpreting inputs without a timezone to be in the given location,
-// or the local timezone if nil.
-func ToTimeInDefaultLocationE(i interface{}, location *time.Location) (tim time.Time, err error) {
-	i = indirect(i)
-
-	switch v := i.(type) {
-	case time.Time:
-		return v, nil
-	case string:
-		return StringToDateInDefaultLocation(v, location)
-	case json.Number:
-		s, err1 := ToInt64E(v)
-		if err1 != nil {
-			return time.Time{}, fmt.Errorf("unable to cast %#v of type %T to Time", i, i)
-		}
-		return time.Unix(s, 0), nil
-	case int:
-		return time.Unix(int64(v), 0), nil
-	case int64:
-		return time.Unix(v, 0), nil
-	case int32:
-		return time.Unix(int64(v), 0), nil
-	case uint:
-		return time.Unix(int64(v), 0), nil
-	case uint64:
-		return time.Unix(int64(v), 0), nil
-	case uint32:
-		return time.Unix(int64(v), 0), nil
-	default:
-		return time.Time{}, fmt.Errorf("unable to cast %#v of type %T to Time", i, i)
-	}
-}
-
-// ToDurationE casts an interface to a time.Duration type.
-func ToDurationE(i interface{}) (d time.Duration, err error) {
-	i = indirect(i)
-
-	switch s := i.(type) {
-	case time.Duration:
-		return s, nil
-	case int, int64, int32, int16, int8, uint, uint64, uint32, uint16, uint8:
-		d = time.Duration(ToInt64(s))
-		return
-	case float32, float64:
-		d = time.Duration(ToFloat64(s))
-		return
-	case string:
-		if strings.ContainsAny(s, "nsuµmh") {
-			d, err = time.ParseDuration(s)
-		} else {
-			d, err = time.ParseDuration(s + "ns")
-		}
-		return
-	case float64EProvider:
-		var v float64
-		v, err = s.Float64()
-		d = time.Duration(v)
-		return
-	case float64Provider:
-		d = time.Duration(s.Float64())
-		return
-	default:
-		err = fmt.Errorf("unable to cast %#v of type %T to Duration", i, i)
-		return
-	}
-}
-
 // ToBoolE casts an interface to a bool type.
 func ToBoolE(i interface{}) (bool, error) {
 	i = indirect(i)
@@ -890,96 +817,6 @@ func ToInt64SliceE(i interface{}) ([]int64, error) {
 	return toSliceE(i, ToInt64E)
 }
 
-// ToDurationSliceE casts an interface to a []time.Duration type.
-func ToDurationSliceE(i interface{}) ([]time.Duration, error) {
-	return toSliceE(i, ToDurationE)
-}
-
-// StringToDate attempts to parse a string into a time.Time type using a
-// predefined list of formats.  If no suitable format is found, an error is
-// returned.
-func StringToDate(s string) (time.Time, error) {
-	return parseDateWith(s, time.UTC, timeFormats)
-}
-
-// StringToDateInDefaultLocation casts an empty interface to a time.Time,
-// interpreting inputs without a timezone to be in the given location,
-// or the local timezone if nil.
-func StringToDateInDefaultLocation(s string, location *time.Location) (time.Time, error) {
-	return parseDateWith(s, location, timeFormats)
-}
-
-type timeFormatType int
-
-const (
-	timeFormatNoTimezone timeFormatType = iota
-	timeFormatNamedTimezone
-	timeFormatNumericTimezone
-	timeFormatNumericAndNamedTimezone
-	timeFormatTimeOnly
-)
-
-type timeFormat struct {
-	format string
-	typ    timeFormatType
-}
-
-func (f timeFormat) hasTimezone() bool {
-	// We don't include the formats with only named timezones, see
-	// https://github.com/golang/go/issues/19694#issuecomment-289103522
-	return f.typ >= timeFormatNumericTimezone && f.typ <= timeFormatNumericAndNamedTimezone
-}
-
-var timeFormats = []timeFormat{
-	// Keep common formats at the top.
-	{"2006-01-02", timeFormatNoTimezone},
-	{time.RFC3339, timeFormatNumericTimezone},
-	{"2006-01-02T15:04:05", timeFormatNoTimezone}, // iso8601 without timezone
-	{time.RFC1123Z, timeFormatNumericTimezone},
-	{time.RFC1123, timeFormatNamedTimezone},
-	{time.RFC822Z, timeFormatNumericTimezone},
-	{time.RFC822, timeFormatNamedTimezone},
-	{time.RFC850, timeFormatNamedTimezone},
-	{"2006-01-02 15:04:05.999999999 -0700 MST", timeFormatNumericAndNamedTimezone}, // Time.String()
-	{"2006-01-02T15:04:05-0700", timeFormatNumericTimezone},                        // RFC3339 without timezone hh:mm colon
-	{"2006-01-02 15:04:05Z0700", timeFormatNumericTimezone},                        // RFC3339 without T or timezone hh:mm colon
-	{"2006-01-02 15:04:05", timeFormatNoTimezone},
-	{time.ANSIC, timeFormatNoTimezone},
-	{time.UnixDate, timeFormatNamedTimezone},
-	{time.RubyDate, timeFormatNumericTimezone},
-	{"2006-01-02 15:04:05Z07:00", timeFormatNumericTimezone},
-	{"02 Jan 2006", timeFormatNoTimezone},
-	{"2006-01-02 15:04:05 -07:00", timeFormatNumericTimezone},
-	{"2006-01-02 15:04:05 -0700", timeFormatNumericTimezone},
-	{time.Kitchen, timeFormatTimeOnly},
-	{time.Stamp, timeFormatTimeOnly},
-	{time.StampMilli, timeFormatTimeOnly},
-	{time.StampMicro, timeFormatTimeOnly},
-	{time.StampNano, timeFormatTimeOnly},
-}
-
-func parseDateWith(s string, location *time.Location, formats []timeFormat) (d time.Time, e error) {
-	for _, format := range formats {
-		if d, e = time.Parse(format.format, s); e == nil {
-
-			// Some time formats have a zone name, but no offset, so it gets
-			// put in that zone name (not the default one passed in to us), but
-			// without that zone's offset. So set the location manually.
-			if format.typ <= timeFormatNamedTimezone {
-				if location == nil {
-					location = time.Local
-				}
-				year, month, day := d.Date()
-				hour, min, sec := d.Clock()
-				d = time.Date(year, month, day, hour, min, sec, d.Nanosecond(), location)
-			}
-
-			return
-		}
-	}
-	return d, fmt.Errorf("unable to parse date: %s", s)
-}
-
 // jsonStringToObject attempts to unmarshall a string as JSON into
 // the object passed as pointer.
 func jsonStringToObject(s string, v interface{}) error {

time.go

@@ -0,0 +1,176 @@
+// Copyright © 2014 Steve Francia <spf@spf13.com>.
+//
+// Use of this source code is governed by an MIT-style
+// license that can be found in the LICENSE file.
+
+package cast
+
+import (
+	"encoding/json"
+	"fmt"
+	"strings"
+	"time"
+)
+
+// ToTimeE casts an interface to a time.Time type.
+func ToTimeE(i interface{}) (tim time.Time, err error) {
+	return ToTimeInDefaultLocationE(i, time.UTC)
+}
+
+// ToTimeInDefaultLocationE casts an empty interface to time.Time,
+// interpreting inputs without a timezone to be in the given location,
+// or the local timezone if nil.
+func ToTimeInDefaultLocationE(i interface{}, location *time.Location) (tim time.Time, err error) {
+	i = indirect(i)
+
+	switch v := i.(type) {
+	case time.Time:
+		return v, nil
+	case string:
+		return StringToDateInDefaultLocation(v, location)
+	case json.Number:
+		s, err1 := ToInt64E(v)
+		if err1 != nil {
+			return time.Time{}, fmt.Errorf("unable to cast %#v of type %T to Time", i, i)
+		}
+		return time.Unix(s, 0), nil
+	case int:
+		return time.Unix(int64(v), 0), nil
+	case int64:
+		return time.Unix(v, 0), nil
+	case int32:
+		return time.Unix(int64(v), 0), nil
+	case uint:
+		return time.Unix(int64(v), 0), nil
+	case uint64:
+		return time.Unix(int64(v), 0), nil
+	case uint32:
+		return time.Unix(int64(v), 0), nil
+	default:
+		return time.Time{}, fmt.Errorf("unable to cast %#v of type %T to Time", i, i)
+	}
+}
+
+// ToDurationE casts an interface to a time.Duration type.
+func ToDurationE(i interface{}) (d time.Duration, err error) {
+	i = indirect(i)
+
+	switch s := i.(type) {
+	case time.Duration:
+		return s, nil
+	case int, int64, int32, int16, int8, uint, uint64, uint32, uint16, uint8:
+		d = time.Duration(ToInt64(s))
+		return
+	case float32, float64:
+		d = time.Duration(ToFloat64(s))
+		return
+	case string:
+		if strings.ContainsAny(s, "nsuµmh") {
+			d, err = time.ParseDuration(s)
+		} else {
+			d, err = time.ParseDuration(s + "ns")
+		}
+		return
+	case float64EProvider:
+		var v float64
+		v, err = s.Float64()
+		d = time.Duration(v)
+		return
+	case float64Provider:
+		d = time.Duration(s.Float64())
+		return
+	default:
+		err = fmt.Errorf("unable to cast %#v of type %T to Duration", i, i)
+		return
+	}
+}
+
+// ToDurationSliceE casts an interface to a []time.Duration type.
+func ToDurationSliceE(i interface{}) ([]time.Duration, error) {
+	return toSliceE(i, ToDurationE)
+}
+
+// StringToDate attempts to parse a string into a time.Time type using a
+// predefined list of formats.  If no suitable format is found, an error is
+// returned.
+func StringToDate(s string) (time.Time, error) {
+	return parseDateWith(s, time.UTC, timeFormats)
+}
+
+// StringToDateInDefaultLocation casts an empty interface to a time.Time,
+// interpreting inputs without a timezone to be in the given location,
+// or the local timezone if nil.
+func StringToDateInDefaultLocation(s string, location *time.Location) (time.Time, error) {
+	return parseDateWith(s, location, timeFormats)
+}
+
+type timeFormatType int
+
+const (
+	timeFormatNoTimezone timeFormatType = iota
+	timeFormatNamedTimezone
+	timeFormatNumericTimezone
+	timeFormatNumericAndNamedTimezone
+	timeFormatTimeOnly
+)
+
+type timeFormat struct {
+	format string
+	typ    timeFormatType
+}
+
+func (f timeFormat) hasTimezone() bool {
+	// We don't include the formats with only named timezones, see
+	// https://github.com/golang/go/issues/19694#issuecomment-289103522
+	return f.typ >= timeFormatNumericTimezone && f.typ <= timeFormatNumericAndNamedTimezone
+}
+
+var timeFormats = []timeFormat{
+	// Keep common formats at the top.
+	{"2006-01-02", timeFormatNoTimezone},
+	{time.RFC3339, timeFormatNumericTimezone},
+	{"2006-01-02T15:04:05", timeFormatNoTimezone}, // iso8601 without timezone
+	{time.RFC1123Z, timeFormatNumericTimezone},
+	{time.RFC1123, timeFormatNamedTimezone},
+	{time.RFC822Z, timeFormatNumericTimezone},
+	{time.RFC822, timeFormatNamedTimezone},
+	{time.RFC850, timeFormatNamedTimezone},
+	{"2006-01-02 15:04:05.999999999 -0700 MST", timeFormatNumericAndNamedTimezone}, // Time.String()
+	{"2006-01-02T15:04:05-0700", timeFormatNumericTimezone},                        // RFC3339 without timezone hh:mm colon
+	{"2006-01-02 15:04:05Z0700", timeFormatNumericTimezone},                        // RFC3339 without T or timezone hh:mm colon
+	{"2006-01-02 15:04:05", timeFormatNoTimezone},
+	{time.ANSIC, timeFormatNoTimezone},
+	{time.UnixDate, timeFormatNamedTimezone},
+	{time.RubyDate, timeFormatNumericTimezone},
+	{"2006-01-02 15:04:05Z07:00", timeFormatNumericTimezone},
+	{"02 Jan 2006", timeFormatNoTimezone},
+	{"2006-01-02 15:04:05 -07:00", timeFormatNumericTimezone},
+	{"2006-01-02 15:04:05 -0700", timeFormatNumericTimezone},
+	{time.Kitchen, timeFormatTimeOnly},
+	{time.Stamp, timeFormatTimeOnly},
+	{time.StampMilli, timeFormatTimeOnly},
+	{time.StampMicro, timeFormatTimeOnly},
+	{time.StampNano, timeFormatTimeOnly},
+}
+
+func parseDateWith(s string, location *time.Location, formats []timeFormat) (d time.Time, e error) {
+	for _, format := range formats {
+		if d, e = time.Parse(format.format, s); e == nil {
+
+			// Some time formats have a zone name, but no offset, so it gets
+			// put in that zone name (not the default one passed in to us), but
+			// without that zone's offset. So set the location manually.
+			if format.typ <= timeFormatNamedTimezone {
+				if location == nil {
+					location = time.Local
+				}
+				year, month, day := d.Date()
+				hour, min, sec := d.Clock()
+				d = time.Date(year, month, day, hour, min, sec, d.Nanosecond(), location)
+			}
+
+			return
+		}
+	}
+	return d, fmt.Errorf("unable to parse date: %s", s)
+}