Misc number fixes

* Allow strings/json.Number with just zeroes after the decmial point to be converted to integer`
* Allow nil in ToFloat*
* Remove some test duplication
* replace testify with quicktest
* Enable integer and float conversion of time.Weekday values

Fixes #139
Fixes #141

.github/workflows/go.yml

@@ -10,7 +10,7 @@ jobs:
   build:
     strategy:
         matrix:
-          go-version: [1.17.x, 1.18.x]
+          go-version: [1.16.x, 1.17.x, 1.18.x]
           os: [ubuntu-latest, windows-latest]
     runs-on: ${{ matrix.os }}
     steps:

caste.go

@@ -35,7 +35,7 @@ func ToTimeInDefaultLocationE(i interface{}, location *time.Location) (tim time.
 	case string:
 		return StringToDateInDefaultLocation(v, location)
 	case json.Number:
-		s, err1 := v.Int64()
+		s, err1 := ToInt64E(v)
 		if err1 != nil {
 			return time.Time{}, fmt.Errorf("unable to cast %#v of type %T to Time", i, i)
 		}
@@ -105,7 +105,7 @@ func ToBoolE(i interface{}) (bool, error) {
 	case string:
 		return strconv.ParseBool(i.(string))
 	case json.Number:
-		v, err := b.Int64()
+		v, err := ToInt64E(b)
 		if err == nil {
 			return v != 0, nil
 		}
@@ -119,13 +119,16 @@ func ToBoolE(i interface{}) (bool, error) {
 func ToFloat64E(i interface{}) (float64, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		return float64(intv), nil
+	}
+
 	switch s := i.(type) {
 	case float64:
 		return s, nil
 	case float32:
 		return float64(s), nil
-	case int:
-		return float64(s), nil
 	case int64:
 		return float64(s), nil
 	case int32:
@@ -161,6 +164,8 @@ func ToFloat64E(i interface{}) (float64, error) {
 			return 1, nil
 		}
 		return 0, nil
+	case nil:
+		return 0, nil
 	default:
 		return 0, fmt.Errorf("unable to cast %#v of type %T to float64", i, i)
 	}
@@ -170,13 +175,16 @@ func ToFloat64E(i interface{}) (float64, error) {
 func ToFloat32E(i interface{}) (float32, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		return float32(intv), nil
+	}
+
 	switch s := i.(type) {
 	case float64:
 		return float32(s), nil
 	case float32:
 		return s, nil
-	case int:
-		return float32(s), nil
 	case int64:
 		return float32(s), nil
 	case int32:
@@ -212,6 +220,8 @@ func ToFloat32E(i interface{}) (float32, error) {
 			return 1, nil
 		}
 		return 0, nil
+	case nil:
+		return 0, nil
 	default:
 		return 0, fmt.Errorf("unable to cast %#v of type %T to float32", i, i)
 	}
@@ -221,9 +231,12 @@ func ToFloat32E(i interface{}) (float32, error) {
 func ToInt64E(i interface{}) (int64, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		return int64(intv), nil
+	}
+
 	switch s := i.(type) {
-	case int:
-		return int64(s), nil
 	case int64:
 		return s, nil
 	case int32:
@@ -247,17 +260,13 @@ func ToInt64E(i interface{}) (int64, error) {
 	case float32:
 		return int64(s), nil
 	case string:
-		v, err := strconv.ParseInt(s, 0, 0)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
 		if err == nil {
 			return v, nil
 		}
 		return 0, fmt.Errorf("unable to cast %#v of type %T to int64", i, i)
 	case json.Number:
-		v, err := s.Int64()
+		return ToInt64E(string(s))
-		if err == nil {
-			return v, nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v of type %T to int64", i, i)
 	case bool:
 		if s {
 			return 1, nil
@@ -274,9 +283,12 @@ func ToInt64E(i interface{}) (int64, error) {
 func ToInt32E(i interface{}) (int32, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		return int32(intv), nil
+	}
+
 	switch s := i.(type) {
-	case int:
-		return int32(s), nil
 	case int64:
 		return int32(s), nil
 	case int32:
@@ -300,17 +312,13 @@ func ToInt32E(i interface{}) (int32, error) {
 	case float32:
 		return int32(s), nil
 	case string:
-		v, err := strconv.ParseInt(s, 0, 0)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
 		if err == nil {
 			return int32(v), nil
 		}
 		return 0, fmt.Errorf("unable to cast %#v of type %T to int32", i, i)
 	case json.Number:
-		v, err := s.Int64()
+		return ToInt32E(string(s))
-		if err == nil {
-			return int32(v), nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v of type %T to int32", i, i)
 	case bool:
 		if s {
 			return 1, nil
@@ -327,9 +335,12 @@ func ToInt32E(i interface{}) (int32, error) {
 func ToInt16E(i interface{}) (int16, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		return int16(intv), nil
+	}
+
 	switch s := i.(type) {
-	case int:
-		return int16(s), nil
 	case int64:
 		return int16(s), nil
 	case int32:
@@ -353,17 +364,13 @@ func ToInt16E(i interface{}) (int16, error) {
 	case float32:
 		return int16(s), nil
 	case string:
-		v, err := strconv.ParseInt(s, 0, 0)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
 		if err == nil {
 			return int16(v), nil
 		}
 		return 0, fmt.Errorf("unable to cast %#v of type %T to int16", i, i)
 	case json.Number:
-		v, err := s.Int64()
+		return ToInt16E(string(s))
-		if err == nil {
-			return int16(v), nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v of type %T to int16", i, i)
 	case bool:
 		if s {
 			return 1, nil
@@ -380,9 +387,12 @@ func ToInt16E(i interface{}) (int16, error) {
 func ToInt8E(i interface{}) (int8, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		return int8(intv), nil
+	}
+
 	switch s := i.(type) {
-	case int:
-		return int8(s), nil
 	case int64:
 		return int8(s), nil
 	case int32:
@@ -406,17 +416,13 @@ func ToInt8E(i interface{}) (int8, error) {
 	case float32:
 		return int8(s), nil
 	case string:
-		v, err := strconv.ParseInt(s, 0, 0)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
 		if err == nil {
 			return int8(v), nil
 		}
 		return 0, fmt.Errorf("unable to cast %#v of type %T to int8", i, i)
 	case json.Number:
-		v, err := s.Int64()
+		return ToInt8E(string(s))
-		if err == nil {
-			return int8(v), nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v of type %T to int8", i, i)
 	case bool:
 		if s {
 			return 1, nil
@@ -433,9 +439,12 @@ func ToInt8E(i interface{}) (int8, error) {
 func ToIntE(i interface{}) (int, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		return intv, nil
+	}
+
 	switch s := i.(type) {
-	case int:
-		return s, nil
 	case int64:
 		return int(s), nil
 	case int32:
@@ -459,17 +468,13 @@ func ToIntE(i interface{}) (int, error) {
 	case float32:
 		return int(s), nil
 	case string:
-		v, err := strconv.ParseInt(s, 0, 0)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
 		if err == nil {
 			return int(v), nil
 		}
-		return 0, fmt.Errorf("unable to cast %#v of type %T to int", i, i)
+		return 0, fmt.Errorf("unable to cast %#v of type %T to int64", i, i)
 	case json.Number:
-		v, err := s.Int64()
+		return ToIntE(string(s))
-		if err == nil {
-			return int(v), nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v of type %T to int", i, i)
 	case bool:
 		if s {
 			return 1, nil
@@ -486,27 +491,26 @@ func ToIntE(i interface{}) (int, error) {
 func ToUintE(i interface{}) (uint, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		if intv < 0 {
+			return 0, errNegativeNotAllowed
+		}
+		return uint(intv), nil
+	}
+
 	switch s := i.(type) {
 	case string:
-		v, err := strconv.ParseUint(s, 0, 0)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
-		if err == nil {
-			return uint(v), nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v to uint: %s", i, err)
-	case json.Number:
-		v, err := s.Int64()
 		if err == nil {
 			if v < 0 {
 				return 0, errNegativeNotAllowed
 			}
 			return uint(v), nil
 		}
-		return 0, fmt.Errorf("unable to cast %#v to uint: %s", i, err)
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint", i, i)
-	case int:
+	case json.Number:
-		if s < 0 {
+		return ToUintE(string(s))
-			return 0, errNegativeNotAllowed
-		}
-		return uint(s), nil
 	case int64:
 		if s < 0 {
 			return 0, errNegativeNotAllowed
@@ -563,27 +567,26 @@ func ToUintE(i interface{}) (uint, error) {
 func ToUint64E(i interface{}) (uint64, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		if intv < 0 {
+			return 0, errNegativeNotAllowed
+		}
+		return uint64(intv), nil
+	}
+
 	switch s := i.(type) {
 	case string:
-		v, err := strconv.ParseUint(s, 0, 64)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
-		if err == nil {
-			return v, nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v to uint64: %s", i, err)
-	case json.Number:
-		v, err := s.Int64()
 		if err == nil {
 			if v < 0 {
 				return 0, errNegativeNotAllowed
 			}
 			return uint64(v), nil
 		}
-		return 0, fmt.Errorf("unable to cast %#v to uint64: %s", i, err)
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint64", i, i)
-	case int:
+	case json.Number:
-		if s < 0 {
+		return ToUint64E(string(s))
-			return 0, errNegativeNotAllowed
-		}
-		return uint64(s), nil
 	case int64:
 		if s < 0 {
 			return 0, errNegativeNotAllowed
@@ -640,27 +643,26 @@ func ToUint64E(i interface{}) (uint64, error) {
 func ToUint32E(i interface{}) (uint32, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		if intv < 0 {
+			return 0, errNegativeNotAllowed
+		}
+		return uint32(intv), nil
+	}
+
 	switch s := i.(type) {
 	case string:
-		v, err := strconv.ParseUint(s, 0, 32)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
-		if err == nil {
-			return uint32(v), nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v to uint32: %s", i, err)
-	case json.Number:
-		v, err := s.Int64()
 		if err == nil {
 			if v < 0 {
 				return 0, errNegativeNotAllowed
 			}
 			return uint32(v), nil
 		}
-		return 0, fmt.Errorf("unable to cast %#v to uint32: %s", i, err)
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint32", i, i)
-	case int:
+	case json.Number:
-		if s < 0 {
+		return ToUint32E(string(s))
-			return 0, errNegativeNotAllowed
-		}
-		return uint32(s), nil
 	case int64:
 		if s < 0 {
 			return 0, errNegativeNotAllowed
@@ -717,27 +719,26 @@ func ToUint32E(i interface{}) (uint32, error) {
 func ToUint16E(i interface{}) (uint16, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		if intv < 0 {
+			return 0, errNegativeNotAllowed
+		}
+		return uint16(intv), nil
+	}
+
 	switch s := i.(type) {
 	case string:
-		v, err := strconv.ParseUint(s, 0, 16)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
-		if err == nil {
-			return uint16(v), nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v to uint16: %s", i, err)
-	case json.Number:
-		v, err := s.Int64()
 		if err == nil {
 			if v < 0 {
 				return 0, errNegativeNotAllowed
 			}
 			return uint16(v), nil
 		}
-		return 0, fmt.Errorf("unable to cast %#v to uint16: %s", i, err)
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint16", i, i)
-	case int:
+	case json.Number:
-		if s < 0 {
+		return ToUint16E(string(s))
-			return 0, errNegativeNotAllowed
-		}
-		return uint16(s), nil
 	case int64:
 		if s < 0 {
 			return 0, errNegativeNotAllowed
@@ -794,27 +795,26 @@ func ToUint16E(i interface{}) (uint16, error) {
 func ToUint8E(i interface{}) (uint8, error) {
 	i = indirect(i)
 
+	intv, ok := toInt(i)
+	if ok {
+		if intv < 0 {
+			return 0, errNegativeNotAllowed
+		}
+		return uint8(intv), nil
+	}
+
 	switch s := i.(type) {
 	case string:
-		v, err := strconv.ParseUint(s, 0, 8)
+		v, err := strconv.ParseInt(trimZeroDecimal(s), 0, 0)
-		if err == nil {
-			return uint8(v), nil
-		}
-		return 0, fmt.Errorf("unable to cast %#v to uint8: %s", i, err)
-	case json.Number:
-		v, err := s.Int64()
 		if err == nil {
 			if v < 0 {
 				return 0, errNegativeNotAllowed
 			}
 			return uint8(v), nil
 		}
-		return 0, fmt.Errorf("unable to cast %#v to uint8: %s", i, err)
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint8", i, i)
-	case int:
+	case json.Number:
-		if s < 0 {
+		return ToUint8E(string(s))
-			return 0, errNegativeNotAllowed
-		}
-		return uint8(s), nil
 	case int64:
 		if s < 0 {
 			return 0, errNegativeNotAllowed
@@ -1385,30 +1385,30 @@ func (f timeFormat) hasTimezone() bool {
 
 var (
 	timeFormats = []timeFormat{
-		timeFormat{time.RFC3339, timeFormatNumericTimezone},
+		{time.RFC3339, timeFormatNumericTimezone},
-		timeFormat{"2006-01-02T15:04:05", timeFormatNoTimezone}, // iso8601 without timezone
+		{"2006-01-02T15:04:05", timeFormatNoTimezone}, // iso8601 without timezone
-		timeFormat{time.RFC1123Z, timeFormatNumericTimezone},
+		{time.RFC1123Z, timeFormatNumericTimezone},
-		timeFormat{time.RFC1123, timeFormatNamedTimezone},
+		{time.RFC1123, timeFormatNamedTimezone},
-		timeFormat{time.RFC822Z, timeFormatNumericTimezone},
+		{time.RFC822Z, timeFormatNumericTimezone},
-		timeFormat{time.RFC822, timeFormatNamedTimezone},
+		{time.RFC822, timeFormatNamedTimezone},
-		timeFormat{time.RFC850, timeFormatNamedTimezone},
+		{time.RFC850, timeFormatNamedTimezone},
-		timeFormat{"2006-01-02 15:04:05.999999999 -0700 MST", timeFormatNumericAndNamedTimezone}, // Time.String()
+		{"2006-01-02 15:04:05.999999999 -0700 MST", timeFormatNumericAndNamedTimezone}, // Time.String()
-		timeFormat{"2006-01-02T15:04:05-0700", timeFormatNumericTimezone},                        // RFC3339 without timezone hh:mm colon
+		{"2006-01-02T15:04:05-0700", timeFormatNumericTimezone},                        // RFC3339 without timezone hh:mm colon
-		timeFormat{"2006-01-02 15:04:05Z0700", timeFormatNumericTimezone},                        // RFC3339 without T or timezone hh:mm colon
+		{"2006-01-02 15:04:05Z0700", timeFormatNumericTimezone},                        // RFC3339 without T or timezone hh:mm colon
-		timeFormat{"2006-01-02 15:04:05", timeFormatNoTimezone},
+		{"2006-01-02 15:04:05", timeFormatNoTimezone},
-		timeFormat{time.ANSIC, timeFormatNoTimezone},
+		{time.ANSIC, timeFormatNoTimezone},
-		timeFormat{time.UnixDate, timeFormatNamedTimezone},
+		{time.UnixDate, timeFormatNamedTimezone},
-		timeFormat{time.RubyDate, timeFormatNumericTimezone},
+		{time.RubyDate, timeFormatNumericTimezone},
-		timeFormat{"2006-01-02 15:04:05Z07:00", timeFormatNumericTimezone},
+		{"2006-01-02 15:04:05Z07:00", timeFormatNumericTimezone},
-		timeFormat{"2006-01-02", timeFormatNoTimezone},
+		{"2006-01-02", timeFormatNoTimezone},
-		timeFormat{"02 Jan 2006", timeFormatNoTimezone},
+		{"02 Jan 2006", timeFormatNoTimezone},
-		timeFormat{"2006-01-02 15:04:05 -07:00", timeFormatNumericTimezone},
+		{"2006-01-02 15:04:05 -07:00", timeFormatNumericTimezone},
-		timeFormat{"2006-01-02 15:04:05 -0700", timeFormatNumericTimezone},
+		{"2006-01-02 15:04:05 -0700", timeFormatNumericTimezone},
-		timeFormat{time.Kitchen, timeFormatTimeOnly},
+		{time.Kitchen, timeFormatTimeOnly},
-		timeFormat{time.Stamp, timeFormatTimeOnly},
+		{time.Stamp, timeFormatTimeOnly},
-		timeFormat{time.StampMilli, timeFormatTimeOnly},
+		{time.StampMilli, timeFormatTimeOnly},
-		timeFormat{time.StampMicro, timeFormatTimeOnly},
+		{time.StampMicro, timeFormatTimeOnly},
-		timeFormat{time.StampNano, timeFormatTimeOnly},
+		{time.StampNano, timeFormatTimeOnly},
 	}
 )
 
@@ -1441,3 +1441,36 @@ func jsonStringToObject(s string, v interface{}) error {
 	data := []byte(s)
 	return json.Unmarshal(data, v)
 }
+
+// toInt returns the int value of v if v or v's underlying type
+// is an int.
+// Note that this will return false for int64 etc. types.
+func toInt(v interface{}) (int, bool) {
+	switch v := v.(type) {
+	case int:
+		return v, true
+	case time.Weekday:
+		return int(v), true
+	case time.Month:
+		return int(v), true
+	default:
+		return 0, false
+	}
+}
+
+func trimZeroDecimal(s string) string {
+	var foundZero bool
+	for i := len(s); i > 0; i-- {
+		switch s[i-1] {
+		case '.':
+			if foundZero {
+				return s[:i-1]
+			}
+		case '0':
+			foundZero = true
+		default:
+			return s
+		}
+	}
+	return s
+}

go.mod

@@ -1,7 +1,13 @@
 module github.com/spf13/cast
 
+go 1.18
+
+require github.com/frankban/quicktest v1.14.3
+
 require (
-	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/google/go-cmp v0.5.7 // indirect
-	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/kr/pretty v0.3.0 // indirect
-	github.com/stretchr/testify v1.2.2
+	github.com/kr/text v0.2.0 // indirect
+	github.com/rogpeppe/go-internal v1.6.1 // indirect
+	golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 // indirect
 )

go.sum

@@ -1,6 +1,18 @@
-github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
-github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/frankban/quicktest v1.14.3 h1:FJKSZTDHjyhriyC81FLQ0LY93eSai0ZyR/ZIkd3ZUKE=
-github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
+github.com/frankban/quicktest v1.14.3/go.mod h1:mgiwOwqx65TmIk1wJ6Q7wvnVMocbUorkibMOrVTHZps=
-github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
+github.com/google/go-cmp v0.5.7 h1:81/ik6ipDQS2aGcBfIN5dHDB36BwrStyeAQquSYCV4o=
-github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
+github.com/google/go-cmp v0.5.7/go.mod h1:n+brtR0CgQNWTVd5ZUFpTBC8YFBDLK/h/bpaJ8/DtOE=
-github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
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