Add additional type conversions

Adds float32, uint, uint64, uint32, uint16, and uint8 throughout.

Fixes #33

cast.go

@@ -32,6 +32,12 @@ func ToFloat64(i interface{}) float64 {
 	return v
 }
 
+// ToFloat32 casts an interface to a float32 type.
+func ToFloat32(i interface{}) float32 {
+	v, _ := ToFloat32E(i)
+	return v
+}
+
 // ToInt64 casts an interface to an int64 type.
 func ToInt64(i interface{}) int64 {
 	v, _ := ToInt64E(i)
@@ -62,6 +68,36 @@ func ToInt(i interface{}) int {
 	return v
 }
 
+// ToUint casts an interface to a uint type.
+func ToUint(i interface{}) uint {
+	v, _ := ToUintE(i)
+	return v
+}
+
+// ToUint64 casts an interface to a uint64 type.
+func ToUint64(i interface{}) uint64 {
+	v, _ := ToUint64E(i)
+	return v
+}
+
+// ToUint32 casts an interface to a uint32 type.
+func ToUint32(i interface{}) uint32 {
+	v, _ := ToUint32E(i)
+	return v
+}
+
+// ToUint16 casts an interface to a uint16 type.
+func ToUint16(i interface{}) uint16 {
+	v, _ := ToUint16E(i)
+	return v
+}
+
+// ToUint8 casts an interface to a uint8 type.
+func ToUint8(i interface{}) uint8 {
+	v, _ := ToUint8E(i)
+	return v
+}
+
 // ToString casts an interface to a string type.
 func ToString(i interface{}) string {
 	v, _ := ToStringE(i)

cast_test.go

@@ -14,6 +14,231 @@ import (
 	"github.com/stretchr/testify/assert"
 )
 
+func TestToUintE(t *testing.T) {
+	tests := []struct {
+		input  interface{}
+		expect uint
+		iserr  bool
+	}{
+		{int(8), 8, false},
+		{int8(8), 8, false},
+		{int16(8), 8, false},
+		{int32(8), 8, false},
+		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
+		{float64(8.31), 8, false},
+		{true, 1, false},
+		{false, 0, false},
+		{"8", 8, false},
+		{nil, 0, false},
+		// errors
+		{"test", 0, true},
+		{testing.T{}, 0, true},
+	}
+
+	for i, test := range tests {
+		errmsg := fmt.Sprintf("i = %d", i) // assert helper message
+
+		v, err := ToUintE(test.input)
+		if test.iserr {
+			assert.Error(t, err, errmsg)
+			continue
+		}
+
+		assert.NoError(t, err, errmsg)
+		assert.Equal(t, test.expect, v, errmsg)
+
+		// Non-E test:
+		v = ToUint(test.input)
+		assert.Equal(t, test.expect, v, errmsg)
+	}
+}
+
+func TestToUint64E(t *testing.T) {
+	tests := []struct {
+		input  interface{}
+		expect uint64
+		iserr  bool
+	}{
+		{int(8), 8, false},
+		{int8(8), 8, false},
+		{int16(8), 8, false},
+		{int32(8), 8, false},
+		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
+		{float64(8.31), 8, false},
+		{true, 1, false},
+		{false, 0, false},
+		{"8", 8, false},
+		{nil, 0, false},
+		// errors
+		{"test", 0, true},
+		{testing.T{}, 0, true},
+	}
+
+	for i, test := range tests {
+		errmsg := fmt.Sprintf("i = %d", i) // assert helper message
+
+		v, err := ToUint64E(test.input)
+		if test.iserr {
+			assert.Error(t, err, errmsg)
+			continue
+		}
+
+		assert.NoError(t, err, errmsg)
+		assert.Equal(t, test.expect, v, errmsg)
+
+		// Non-E test:
+		v = ToUint64(test.input)
+		assert.Equal(t, test.expect, v, errmsg)
+	}
+}
+
+func TestToUint32E(t *testing.T) {
+	tests := []struct {
+		input  interface{}
+		expect uint32
+		iserr  bool
+	}{
+		{int(8), 8, false},
+		{int8(8), 8, false},
+		{int16(8), 8, false},
+		{int32(8), 8, false},
+		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
+		{float64(8.31), 8, false},
+		{true, 1, false},
+		{false, 0, false},
+		{"8", 8, false},
+		{nil, 0, false},
+		// errors
+		{"test", 0, true},
+		{testing.T{}, 0, true},
+	}
+
+	for i, test := range tests {
+		errmsg := fmt.Sprintf("i = %d", i) // assert helper message
+
+		v, err := ToUint32E(test.input)
+		if test.iserr {
+			assert.Error(t, err, errmsg)
+			continue
+		}
+
+		assert.NoError(t, err, errmsg)
+		assert.Equal(t, test.expect, v, errmsg)
+
+		// Non-E test:
+		v = ToUint32(test.input)
+		assert.Equal(t, test.expect, v, errmsg)
+	}
+}
+
+func TestToUint16E(t *testing.T) {
+	tests := []struct {
+		input  interface{}
+		expect uint16
+		iserr  bool
+	}{
+		{int(8), 8, false},
+		{int8(8), 8, false},
+		{int16(8), 8, false},
+		{int32(8), 8, false},
+		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
+		{float64(8.31), 8, false},
+		{true, 1, false},
+		{false, 0, false},
+		{"8", 8, false},
+		{nil, 0, false},
+		// errors
+		{"test", 0, true},
+		{testing.T{}, 0, true},
+	}
+
+	for i, test := range tests {
+		errmsg := fmt.Sprintf("i = %d", i) // assert helper message
+
+		v, err := ToUint16E(test.input)
+		if test.iserr {
+			assert.Error(t, err, errmsg)
+			continue
+		}
+
+		assert.NoError(t, err, errmsg)
+		assert.Equal(t, test.expect, v, errmsg)
+
+		// Non-E test
+		v = ToUint16(test.input)
+		assert.Equal(t, test.expect, v, errmsg)
+	}
+}
+
+func TestToUint8E(t *testing.T) {
+	tests := []struct {
+		input  interface{}
+		expect uint8
+		iserr  bool
+	}{
+		{int(8), 8, false},
+		{int8(8), 8, false},
+		{int16(8), 8, false},
+		{int32(8), 8, false},
+		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
+		{float64(8.31), 8, false},
+		{true, 1, false},
+		{false, 0, false},
+		{"8", 8, false},
+		{nil, 0, false},
+		// errors
+		{"test", 0, true},
+		{testing.T{}, 0, true},
+	}
+
+	for i, test := range tests {
+		errmsg := fmt.Sprintf("i = %d", i) // assert helper message
+
+		v, err := ToUint8E(test.input)
+		if test.iserr {
+			assert.Error(t, err, errmsg)
+			continue
+		}
+
+		assert.NoError(t, err, errmsg)
+		assert.Equal(t, test.expect, v, errmsg)
+
+		// Non-E test
+		v = ToUint8(test.input)
+		assert.Equal(t, test.expect, v, errmsg)
+	}
+}
+
 func TestToIntE(t *testing.T) {
 	tests := []struct {
 		input  interface{}
@@ -25,6 +250,12 @@ func TestToIntE(t *testing.T) {
 		{int16(8), 8, false},
 		{int32(8), 8, false},
 		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
 		{float64(8.31), 8, false},
 		{true, 1, false},
 		{false, 0, false},
@@ -64,6 +295,12 @@ func TestToInt64E(t *testing.T) {
 		{int16(8), 8, false},
 		{int32(8), 8, false},
 		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
 		{float64(8.31), 8, false},
 		{true, 1, false},
 		{false, 0, false},
@@ -103,6 +340,12 @@ func TestToInt32E(t *testing.T) {
 		{int16(8), 8, false},
 		{int32(8), 8, false},
 		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
 		{float64(8.31), 8, false},
 		{true, 1, false},
 		{false, 0, false},
@@ -142,6 +385,12 @@ func TestToInt16E(t *testing.T) {
 		{int16(8), 8, false},
 		{int32(8), 8, false},
 		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
 		{float64(8.31), 8, false},
 		{true, 1, false},
 		{false, 0, false},
@@ -181,6 +430,12 @@ func TestToInt8E(t *testing.T) {
 		{int16(8), 8, false},
 		{int32(8), 8, false},
 		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8, false},
 		{float64(8.31), 8, false},
 		{true, 1, false},
 		{false, 0, false},
@@ -220,9 +475,16 @@ func TestToFloat64E(t *testing.T) {
 		{int16(8), 8, false},
 		{int32(8), 8, false},
 		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
 		{float32(8), 8, false},
 		{float64(8.31), 8.31, false},
 		{"8", 8, false},
+		{true, 1, false},
+		{false, 0, false},
 		// errors
 		{"test", 0, true},
 		{testing.T{}, 0, true},
@@ -246,6 +508,50 @@ func TestToFloat64E(t *testing.T) {
 	}
 }
 
+func TestToFloat32E(t *testing.T) {
+	tests := []struct {
+		input  interface{}
+		expect float32
+		iserr  bool
+	}{
+		{int(8), 8, false},
+		{int8(8), 8, false},
+		{int16(8), 8, false},
+		{int32(8), 8, false},
+		{int64(8), 8, false},
+		{uint(8), 8, false},
+		{uint8(8), 8, false},
+		{uint16(8), 8, false},
+		{uint32(8), 8, false},
+		{uint64(8), 8, false},
+		{float32(8.31), 8.31, false},
+		{float64(8.31), 8.31, false},
+		{"8", 8, false},
+		{true, 1, false},
+		{false, 0, false},
+		// errors
+		{"test", 0, true},
+		{testing.T{}, 0, true},
+	}
+
+	for i, test := range tests {
+		errmsg := fmt.Sprintf("i = %d", i) // assert helper message
+
+		v, err := ToFloat32E(test.input)
+		if test.iserr {
+			assert.Error(t, err, errmsg)
+			continue
+		}
+
+		assert.NoError(t, err, errmsg)
+		assert.Equal(t, test.expect, v, errmsg)
+
+		// Non-E test
+		v = ToFloat32(test.input)
+		assert.Equal(t, test.expect, v, errmsg)
+	}
+}
+
 func TestToStringE(t *testing.T) {
 	type Key struct {
 		k string
@@ -258,7 +564,16 @@ func TestToStringE(t *testing.T) {
 		iserr  bool
 	}{
 		{int(8), "8", false},
+		{int8(8), "8", false},
+		{int16(8), "8", false},
+		{int32(8), "8", false},
 		{int64(8), "8", false},
+		{uint(8), "8", false},
+		{uint8(8), "8", false},
+		{uint16(8), "8", false},
+		{uint32(8), "8", false},
+		{uint64(8), "8", false},
+		{float32(8.31), "8.31", false},
 		{float64(8.31), "8.31", false},
 		{true, "true", false},
 		{false, "false", false},
@@ -716,6 +1031,9 @@ func TestToTimeEE(t *testing.T) {
 		{int(1482597504), time.Date(2016, 12, 24, 16, 38, 24, 0, time.UTC), false},
 		{int64(1234567890), time.Date(2009, 2, 13, 23, 31, 30, 0, time.UTC), false},
 		{int32(1234567890), time.Date(2009, 2, 13, 23, 31, 30, 0, time.UTC), false},
+		{uint(1482597504), time.Date(2016, 12, 24, 16, 38, 24, 0, time.UTC), false},
+		{uint64(1234567890), time.Date(2009, 2, 13, 23, 31, 30, 0, time.UTC), false},
+		{uint32(1234567890), time.Date(2009, 2, 13, 23, 31, 30, 0, time.UTC), false},
 		{time.Date(2009, 2, 13, 23, 31, 30, 0, time.UTC), time.Date(2009, 2, 13, 23, 31, 30, 0, time.UTC), false},
 		// errors
 		{"2006", time.Time{}, true},
@@ -754,7 +1072,13 @@ func TestToDurationE(t *testing.T) {
 		{int32(5), td, false},
 		{int16(5), td, false},
 		{int8(5), td, false},
+		{uint(5), td, false},
+		{uint64(5), td, false},
+		{uint32(5), td, false},
+		{uint16(5), td, false},
+		{uint8(5), td, false},
 		{float64(5), td, false},
+		{float32(5), td, false},
 		{string("5"), td, false},
 		{string("5ns"), td, false},
 		{string("5us"), time.Microsecond * td, false},

caste.go

@@ -25,10 +25,16 @@ func ToTimeE(i interface{}) (tim time.Time, err error) {
 		return StringToDate(v)
 	case int:
 		return time.Unix(int64(v), 0), nil
-	case int32:
-		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)
 	}
@@ -41,7 +47,7 @@ func ToDurationE(i interface{}) (d time.Duration, err error) {
 	switch s := i.(type) {
 	case time.Duration:
 		return s, nil
-	case int64, int32, int16, int8, int:
+	case int, int64, int32, int16, int8, uint, uint64, uint32, uint16, uint8:
 		d = time.Duration(ToInt64(s))
 		return
 	case float32, float64:
@@ -62,7 +68,6 @@ func ToDurationE(i interface{}) (d time.Duration, err error) {
 
 // ToBoolE casts an interface to a bool type.
 func ToBoolE(i interface{}) (bool, error) {
-
 	i = indirect(i)
 
 	switch b := i.(type) {
@@ -91,6 +96,8 @@ func ToFloat64E(i interface{}) (float64, error) {
 		return s, nil
 	case float32:
 		return float64(s), nil
+	case int:
+		return float64(s), nil
 	case int64:
 		return float64(s), nil
 	case int32:
@@ -99,16 +106,74 @@ func ToFloat64E(i interface{}) (float64, error) {
 		return float64(s), nil
 	case int8:
 		return float64(s), nil
-	case int:
+	case uint:
+		return float64(s), nil
+	case uint64:
+		return float64(s), nil
+	case uint32:
+		return float64(s), nil
+	case uint16:
+		return float64(s), nil
+	case uint8:
 		return float64(s), nil
 	case string:
 		v, err := strconv.ParseFloat(s, 64)
 		if err == nil {
 			return float64(v), nil
 		}
-		return 0.0, fmt.Errorf("unable to cast %#v of type %T to float", i, i)
+		return 0.0, fmt.Errorf("unable to cast %#v of type %T to float64", i, i)
+	case bool:
+		if s {
+			return 1, nil
+		}
+		return 0, nil
 	default:
-		return 0.0, fmt.Errorf("unable to cast %#v of type %T to float", i, i)
+		return 0.0, fmt.Errorf("unable to cast %#v of type %T to float64", i, i)
+	}
+}
+
+// ToFloat32E casts an interface to a float32 type.
+func ToFloat32E(i interface{}) (float32, error) {
+	i = indirect(i)
+
+	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:
+		return float32(s), nil
+	case int16:
+		return float32(s), nil
+	case int8:
+		return float32(s), nil
+	case uint:
+		return float32(s), nil
+	case uint64:
+		return float32(s), nil
+	case uint32:
+		return float32(s), nil
+	case uint16:
+		return float32(s), nil
+	case uint8:
+		return float32(s), nil
+	case string:
+		v, err := strconv.ParseFloat(s, 32)
+		if err == nil {
+			return float32(v), nil
+		}
+		return 0, fmt.Errorf("unable to cast %#v of type %T to float32", i, i)
+	case bool:
+		if s {
+			return 1, nil
+		}
+		return 0, nil
+	default:
+		return 0, fmt.Errorf("unable to cast %#v of type %T to float32", i, i)
 	}
 }
 
@@ -117,24 +182,36 @@ func ToInt64E(i interface{}) (int64, error) {
 	i = indirect(i)
 
 	switch s := i.(type) {
-	case int64:
-		return s, nil
 	case int:
 		return int64(s), nil
+	case int64:
+		return s, nil
 	case int32:
 		return int64(s), nil
 	case int16:
 		return int64(s), nil
 	case int8:
 		return int64(s), nil
+	case uint:
+		return int64(s), nil
+	case uint64:
+		return int64(s), nil
+	case uint32:
+		return int64(s), nil
+	case uint16:
+		return int64(s), nil
+	case uint8:
+		return int64(s), nil
+	case float64:
+		return int64(s), nil
+	case float32:
+		return int64(s), nil
 	case string:
 		v, err := strconv.ParseInt(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 float64:
-		return int64(s), nil
 	case bool:
 		if bool(s) {
 			return int64(1), nil
@@ -152,24 +229,36 @@ func ToInt32E(i interface{}) (int32, error) {
 	i = indirect(i)
 
 	switch s := i.(type) {
-	case int64:
-		return int32(s), nil
 	case int:
 		return int32(s), nil
+	case int64:
+		return int32(s), nil
 	case int32:
 		return s, nil
 	case int16:
 		return int32(s), nil
 	case int8:
 		return int32(s), nil
+	case uint:
+		return int32(s), nil
+	case uint64:
+		return int32(s), nil
+	case uint32:
+		return int32(s), nil
+	case uint16:
+		return int32(s), nil
+	case uint8:
+		return int32(s), nil
+	case float64:
+		return int32(s), nil
+	case float32:
+		return int32(s), nil
 	case string:
 		v, err := strconv.ParseInt(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 float64:
-		return int32(s), nil
 	case bool:
 		if bool(s) {
 			return int32(1), nil
@@ -187,24 +276,36 @@ func ToInt16E(i interface{}) (int16, error) {
 	i = indirect(i)
 
 	switch s := i.(type) {
-	case int64:
-		return int16(s), nil
 	case int:
 		return int16(s), nil
+	case int64:
+		return int16(s), nil
 	case int32:
 		return int16(s), nil
 	case int16:
 		return s, nil
 	case int8:
 		return int16(s), nil
+	case uint:
+		return int16(s), nil
+	case uint64:
+		return int16(s), nil
+	case uint32:
+		return int16(s), nil
+	case uint16:
+		return int16(s), nil
+	case uint8:
+		return int16(s), nil
+	case float64:
+		return int16(s), nil
+	case float32:
+		return int16(s), nil
 	case string:
 		v, err := strconv.ParseInt(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 float64:
-		return int16(s), nil
 	case bool:
 		if bool(s) {
 			return int16(1), nil
@@ -222,24 +323,36 @@ func ToInt8E(i interface{}) (int8, error) {
 	i = indirect(i)
 
 	switch s := i.(type) {
-	case int64:
-		return int8(s), nil
 	case int:
 		return int8(s), nil
+	case int64:
+		return int8(s), nil
 	case int32:
 		return int8(s), nil
 	case int16:
 		return int8(s), nil
 	case int8:
 		return s, nil
+	case uint:
+		return int8(s), nil
+	case uint64:
+		return int8(s), nil
+	case uint32:
+		return int8(s), nil
+	case uint16:
+		return int8(s), nil
+	case uint8:
+		return int8(s), nil
+	case float64:
+		return int8(s), nil
+	case float32:
+		return int8(s), nil
 	case string:
 		v, err := strconv.ParseInt(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 float64:
-		return int8(s), nil
 	case bool:
 		if bool(s) {
 			return int8(1), nil
@@ -267,14 +380,26 @@ func ToIntE(i interface{}) (int, error) {
 		return int(s), nil
 	case int8:
 		return int(s), nil
+	case uint:
+		return int(s), nil
+	case uint64:
+		return int(s), nil
+	case uint32:
+		return int(s), nil
+	case uint16:
+		return int(s), nil
+	case uint8:
+		return int(s), nil
+	case float64:
+		return int(s), nil
+	case float32:
+		return int(s), nil
 	case string:
 		v, err := strconv.ParseInt(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)
-	case float64:
-		return int(s), nil
 	case bool:
 		if bool(s) {
 			return 1, nil
@@ -287,6 +412,241 @@ func ToIntE(i interface{}) (int, error) {
 	}
 }
 
+// ToUintE casts an interface to a uint type.
+func ToUintE(i interface{}) (uint, error) {
+	i = indirect(i)
+
+	switch s := i.(type) {
+	case string:
+		v, err := strconv.ParseUint(s, 0, 0)
+		if err == nil {
+			return uint(v), nil
+		}
+		return 0, fmt.Errorf("unable to cast %#v to uint: %s", i, err)
+	case int:
+		return uint(s), nil
+	case int64:
+		return uint(s), nil
+	case int32:
+		return uint(s), nil
+	case int16:
+		return uint(s), nil
+	case int8:
+		return uint(s), nil
+	case uint:
+		return s, nil
+	case uint64:
+		return uint(s), nil
+	case uint32:
+		return uint(s), nil
+	case uint16:
+		return uint(s), nil
+	case uint8:
+		return uint(s), nil
+	case float64:
+		return uint(s), nil
+	case float32:
+		return uint(s), nil
+	case bool:
+		if s {
+			return 1, nil
+		}
+		return 0, nil
+	case nil:
+		return 0, nil
+	default:
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint", i, i)
+	}
+}
+
+// ToUint64E casts an interface to a uint64 type.
+func ToUint64E(i interface{}) (uint64, error) {
+	i = indirect(i)
+
+	switch s := i.(type) {
+	case string:
+		v, err := strconv.ParseUint(s, 0, 64)
+		if err == nil {
+			return v, nil
+		}
+		return 0, fmt.Errorf("unable to cast %#v to uint64: %s", i, err)
+	case int:
+		return uint64(s), nil
+	case int64:
+		return uint64(s), nil
+	case int32:
+		return uint64(s), nil
+	case int16:
+		return uint64(s), nil
+	case int8:
+		return uint64(s), nil
+	case uint:
+		return uint64(s), nil
+	case uint64:
+		return s, nil
+	case uint32:
+		return uint64(s), nil
+	case uint16:
+		return uint64(s), nil
+	case uint8:
+		return uint64(s), nil
+	case float32:
+		return uint64(s), nil
+	case float64:
+		return uint64(s), nil
+	case bool:
+		if s {
+			return 1, nil
+		}
+		return 0, nil
+	case nil:
+		return 0, nil
+	default:
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint64", i, i)
+	}
+}
+
+// ToUint32E casts an interface to a uint32 type.
+func ToUint32E(i interface{}) (uint32, error) {
+	i = indirect(i)
+
+	switch s := i.(type) {
+	case string:
+		v, err := strconv.ParseUint(s, 0, 32)
+		if err == nil {
+			return uint32(v), nil
+		}
+		return 0, fmt.Errorf("unable to cast %#v to uint32: %s", i, err)
+	case int:
+		return uint32(s), nil
+	case int64:
+		return uint32(s), nil
+	case int32:
+		return uint32(s), nil
+	case int16:
+		return uint32(s), nil
+	case int8:
+		return uint32(s), nil
+	case uint:
+		return uint32(s), nil
+	case uint64:
+		return uint32(s), nil
+	case uint32:
+		return s, nil
+	case uint16:
+		return uint32(s), nil
+	case uint8:
+		return uint32(s), nil
+	case float64:
+		return uint32(s), nil
+	case float32:
+		return uint32(s), nil
+	case bool:
+		if s {
+			return 1, nil
+		}
+		return 0, nil
+	case nil:
+		return 0, nil
+	default:
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint32", i, i)
+	}
+}
+
+// ToUint16E casts an interface to a uint16 type.
+func ToUint16E(i interface{}) (uint16, error) {
+	i = indirect(i)
+
+	switch s := i.(type) {
+	case string:
+		v, err := strconv.ParseUint(s, 0, 16)
+		if err == nil {
+			return uint16(v), nil
+		}
+		return 0, fmt.Errorf("unable to cast %#v to uint16: %s", i, err)
+	case int:
+		return uint16(s), nil
+	case int64:
+		return uint16(s), nil
+	case int32:
+		return uint16(s), nil
+	case int16:
+		return uint16(s), nil
+	case int8:
+		return uint16(s), nil
+	case uint:
+		return uint16(s), nil
+	case uint64:
+		return uint16(s), nil
+	case uint32:
+		return uint16(s), nil
+	case uint16:
+		return s, nil
+	case uint8:
+		return uint16(s), nil
+	case float64:
+		return uint16(s), nil
+	case float32:
+		return uint16(s), nil
+	case bool:
+		if s {
+			return 1, nil
+		}
+		return 0, nil
+	case nil:
+		return 0, nil
+	default:
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint16", i, i)
+	}
+}
+
+// ToUint8E casts an interface to a uint type.
+func ToUint8E(i interface{}) (uint8, error) {
+	i = indirect(i)
+
+	switch s := i.(type) {
+	case string:
+		v, err := strconv.ParseUint(s, 0, 8)
+		if err == nil {
+			return uint8(v), nil
+		}
+		return 0, fmt.Errorf("unable to cast %#v to uint8: %s", i, err)
+	case int:
+		return uint8(s), nil
+	case int64:
+		return uint8(s), nil
+	case int32:
+		return uint8(s), nil
+	case int16:
+		return uint8(s), nil
+	case int8:
+		return uint8(s), nil
+	case uint:
+		return uint8(s), nil
+	case uint64:
+		return uint8(s), nil
+	case uint32:
+		return uint8(s), nil
+	case uint16:
+		return uint8(s), nil
+	case uint8:
+		return s, nil
+	case float64:
+		return uint8(s), nil
+	case float32:
+		return uint8(s), nil
+	case bool:
+		if s {
+			return 1, nil
+		}
+		return 0, nil
+	case nil:
+		return 0, nil
+	default:
+		return 0, fmt.Errorf("unable to cast %#v of type %T to uint8", i, i)
+	}
+}
+
 // From html/template/content.go
 // Copyright 2011 The Go Authors. All rights reserved.
 // indirect returns the value, after dereferencing as many times
@@ -337,10 +697,28 @@ func ToStringE(i interface{}) (string, error) {
 		return strconv.FormatBool(s), nil
 	case float64:
 		return strconv.FormatFloat(s, 'f', -1, 64), nil
-	case int64:
+	case float32:
-		return strconv.FormatInt(s, 10), nil
+		return strconv.FormatFloat(float64(s), 'f', -1, 32), nil
 	case int:
 		return strconv.Itoa(s), nil
+	case int64:
+		return strconv.FormatInt(s, 10), nil
+	case int32:
+		return strconv.Itoa(int(s)), nil
+	case int16:
+		return strconv.FormatInt(int64(s), 10), nil
+	case int8:
+		return strconv.FormatInt(int64(s), 10), nil
+	case uint:
+		return strconv.FormatInt(int64(s), 10), nil
+	case uint64:
+		return strconv.FormatInt(int64(s), 10), nil
+	case uint32:
+		return strconv.FormatInt(int64(s), 10), nil
+	case uint16:
+		return strconv.FormatInt(int64(s), 10), nil
+	case uint8:
+		return strconv.FormatInt(int64(s), 10), nil
 	case []byte:
 		return string(s), nil
 	case template.HTML:
@@ -366,7 +744,6 @@ func ToStringE(i interface{}) (string, error) {
 
 // ToStringMapStringE casts an interface to a map[string]string type.
 func ToStringMapStringE(i interface{}) (map[string]string, error) {
-
 	var m = map[string]string{}
 
 	switch v := i.(type) {
@@ -394,7 +771,6 @@ func ToStringMapStringE(i interface{}) (map[string]string, error) {
 
 // ToStringMapStringSliceE casts an interface to a map[string][]string type.
 func ToStringMapStringSliceE(i interface{}) (map[string][]string, error) {
-
 	var m = map[string][]string{}
 
 	switch v := i.(type) {
@@ -456,7 +832,6 @@ func ToStringMapStringSliceE(i interface{}) (map[string][]string, error) {
 
 // ToStringMapBoolE casts an interface to a map[string]bool type.
 func ToStringMapBoolE(i interface{}) (map[string]bool, error) {
-
 	var m = map[string]bool{}
 
 	switch v := i.(type) {
@@ -479,7 +854,6 @@ func ToStringMapBoolE(i interface{}) (map[string]bool, error) {
 
 // ToStringMapE casts an interface to a map[string]interface{} type.
 func ToStringMapE(i interface{}) (map[string]interface{}, error) {
-
 	var m = map[string]interface{}{}
 
 	switch v := i.(type) {
@@ -497,7 +871,6 @@ func ToStringMapE(i interface{}) (map[string]interface{}, error) {
 
 // ToSliceE casts an interface to a []interface{} type.
 func ToSliceE(i interface{}) ([]interface{}, error) {
-
 	var s []interface{}
 
 	switch v := i.(type) {
@@ -515,7 +888,6 @@ func ToSliceE(i interface{}) ([]interface{}, error) {
 
 // ToBoolSliceE casts an interface to a []bool type.
 func ToBoolSliceE(i interface{}) ([]bool, error) {
-
 	if i == nil {
 		return []bool{}, fmt.Errorf("unable to cast %#v of type %T to []bool", i, i)
 	}
@@ -545,7 +917,6 @@ func ToBoolSliceE(i interface{}) ([]bool, error) {
 
 // ToStringSliceE casts an interface to a []string type.
 func ToStringSliceE(i interface{}) ([]string, error) {
-
 	var a []string
 
 	switch v := i.(type) {
@@ -571,7 +942,6 @@ func ToStringSliceE(i interface{}) ([]string, error) {
 
 // ToIntSliceE casts an interface to a []int type.
 func ToIntSliceE(i interface{}) ([]int, error) {
-
 	if i == nil {
 		return []int{}, fmt.Errorf("unable to cast %#v of type %T to []int", i, i)
 	}