func checkAgainstComplex64(e complex64, c reflect.Value) (err error) {
err = errors.New("")
realPart := real(e)
imaginaryPart := imag(e)
switch {
case isInteger(c) || isFloat(c):
// If we have no imaginary part, then we should just compare against the
// real part. Otherwise, we can't be equal.
if imaginaryPart != 0 {
return
}
return checkAgainstFloat32(realPart, c)
case isComplex(c):
// Compare using complex64 to avoid a false sense of precision; otherwise
// e.g. Equals(0.1 + 0i) won't match float32(0.1).
if complex64(c.Complex()) == e {
err = nil
}
default:
err = NewFatalError("which is not numeric")
}
return
}
func checkAgainstComplex128(e complex128, c reflect.Value) (err error) {
err = errors.New("")
realPart := real(e)
imaginaryPart := imag(e)
switch {
case isInteger(c) || isFloat(c):
// If we have no imaginary part, then we should just compare against the
// real part. Otherwise, we can't be equal.
if imaginaryPart != 0 {
return
}
return checkAgainstFloat64(realPart, c)
case isComplex(c):
if c.Complex() == e {
err = nil
}
default:
err = NewFatalError("which is not numeric")
}
return
}
func nonzero(v reflect.Value) bool {
switch v.Kind() {
case reflect.Bool:
return v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() != 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v.Uint() != 0
case reflect.Float32, reflect.Float64:
return v.Float() != 0
case reflect.Complex64, reflect.Complex128:
return v.Complex() != complex(0, 0)
case reflect.String:
return v.String() != ""
case reflect.Struct:
for i := 0; i < v.NumField(); i++ {
if nonzero(getField(v, i)) {
return true
}
}
return false
case reflect.Array:
for i := 0; i < v.Len(); i++ {
if nonzero(v.Index(i)) {
return true
}
}
return false
case reflect.Map, reflect.Interface, reflect.Slice, reflect.Ptr, reflect.Chan, reflect.Func:
return !v.IsNil()
case reflect.UnsafePointer:
return v.Pointer() != 0
}
return true
}
func builtinImag(cplx reflect.Value) reflect.Value {
if cplx.Type() == c128 {
return reflect.ValueOf(float64(imag(cplx.Complex())))
} else {
return reflect.ValueOf(float32(imag(cplx.Complex())))
}
}
func encodeBasic(v reflect.Value) string {
t := v.Type()
switch k := t.Kind(); k {
case reflect.Bool:
return strconv.FormatBool(v.Bool())
case reflect.Int,
reflect.Int8,
reflect.Int16,
reflect.Int32,
reflect.Int64:
return strconv.FormatInt(v.Int(), 10)
case reflect.Uint,
reflect.Uint8,
reflect.Uint16,
reflect.Uint32,
reflect.Uint64:
return strconv.FormatUint(v.Uint(), 10)
case reflect.Float32:
return strconv.FormatFloat(v.Float(), 'g', -1, 32)
case reflect.Float64:
return strconv.FormatFloat(v.Float(), 'g', -1, 64)
case reflect.Complex64, reflect.Complex128:
s := fmt.Sprintf("%g", v.Complex())
return strings.TrimSuffix(strings.TrimPrefix(s, "("), ")")
case reflect.String:
return v.String()
}
panic(t.String() + " has unsupported kind " + t.Kind().String())
}
// Returns the string representation of the field value
func (enc *encoder) encodeCol(fv reflect.Value, st reflect.StructTag) string {
switch fv.Kind() {
case reflect.String:
return fv.String()
case reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int8:
return fmt.Sprintf("%v", fv.Int())
case reflect.Float32:
return encodeFloat(32, fv)
case reflect.Float64:
return encodeFloat(64, fv)
case reflect.Bool:
return encodeBool(fv.Bool(), st)
case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint8:
return fmt.Sprintf("%v", fv.Uint())
case reflect.Complex64, reflect.Complex128:
return fmt.Sprintf("%+.3g", fv.Complex())
case reflect.Interface:
return encodeInterface(fv, st)
case reflect.Struct:
return encodeInterface(fv, st)
default:
panic(fmt.Sprintf("Unsupported type %s", fv.Kind()))
}
return ""
}
func evalBinaryComplexExpr(x reflect.Value, op token.Token, y reflect.Value) (reflect.Value, error) {
var r complex128
var is_bool bool
var b bool
xx, yy := x.Complex(), y.Complex()
switch op {
case token.ADD:
r = xx + yy
case token.SUB:
r = xx - yy
case token.MUL:
r = xx * yy
case token.QUO:
if yy == 0 {
return reflect.Value{}, PanicDivideByZero{}
}
r = xx / yy
case token.EQL:
b = xx == yy
is_bool = true
case token.NEQ:
b = xx != yy
is_bool = true
default:
panic(dytc("bad binary op"))
}
if is_bool {
return reflect.ValueOf(b), nil
} else {
return reflect.ValueOf(r).Convert(x.Type()), nil
}
}
// isZero reports whether the value is the zero of its type.
func isZero(val reflect.Value) bool {
switch val.Kind() {
case reflect.Array:
for i := 0; i < val.Len(); i++ {
if !isZero(val.Index(i)) {
return false
}
}
return true
case reflect.Map, reflect.Slice, reflect.String:
return val.Len() == 0
case reflect.Bool:
return !val.Bool()
case reflect.Complex64, reflect.Complex128:
return val.Complex() == 0
case reflect.Chan, reflect.Func, reflect.Ptr:
return val.IsNil()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return val.Int() == 0
case reflect.Float32, reflect.Float64:
return val.Float() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return val.Uint() == 0
case reflect.Struct:
for i := 0; i < val.NumField(); i++ {
if !isZero(val.Field(i)) {
return false
}
}
return true
}
panic("unknown type in isZero " + val.Type().String())
}
func formatValue(value reflect.Value, indentation uint) string {
if indentation > MaxDepth {
return "..."
}
if isNilValue(value) {
return "nil"
}
if UseStringerRepresentation {
if value.CanInterface() {
obj := value.Interface()
switch x := obj.(type) {
case fmt.GoStringer:
return x.GoString()
case fmt.Stringer:
return x.String()
}
}
}
switch value.Kind() {
case reflect.Bool:
return fmt.Sprintf("%v", value.Bool())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return fmt.Sprintf("%v", value.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return fmt.Sprintf("%v", value.Uint())
case reflect.Uintptr:
return fmt.Sprintf("0x%x", value.Uint())
case reflect.Float32, reflect.Float64:
return fmt.Sprintf("%v", value.Float())
case reflect.Complex64, reflect.Complex128:
return fmt.Sprintf("%v", value.Complex())
case reflect.Chan:
return fmt.Sprintf("0x%x", value.Pointer())
case reflect.Func:
return fmt.Sprintf("0x%x", value.Pointer())
case reflect.Ptr:
return formatValue(value.Elem(), indentation)
case reflect.Slice:
return formatSlice(value, indentation)
case reflect.String:
return formatString(value.String(), indentation)
case reflect.Array:
return formatSlice(value, indentation)
case reflect.Map:
return formatMap(value, indentation)
case reflect.Struct:
return formatStruct(value, indentation)
case reflect.Interface:
return formatValue(value.Elem(), indentation)
default:
if value.CanInterface() {
return fmt.Sprintf("%#v", value.Interface())
} else {
return fmt.Sprintf("%#v", value)
}
}
}
func isZeroValue(v reflect.Value) bool {
switch v.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16,
reflect.Int32, reflect.Int64:
return 0 == v.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16,
reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return 0 == v.Uint()
case reflect.String:
return "" == v.String()
case reflect.Bool:
return !v.Bool()
case reflect.Float32, reflect.Float64:
return 0 == v.Float()
case reflect.Complex64, reflect.Complex128:
return 0 == real(v.Complex()) && 0 == imag(v.Complex())
}
return false
}
// isTrue reports whether the value is 'true', in the sense of not the zero of its type,
// and whether the value has a meaningful truth value.
func isTrue(val reflect.Value) (truth, ok bool) {
if !val.IsValid() {
// Something like var x interface{}, never set. It's a form of nil.
return false, true
}
switch val.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
truth = val.Len() > 0
case reflect.Bool:
truth = val.Bool()
case reflect.Complex64, reflect.Complex128:
truth = val.Complex() != 0
case reflect.Chan, reflect.Func, reflect.Ptr, reflect.Interface:
truth = !val.IsNil()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
truth = val.Int() != 0
case reflect.Float32, reflect.Float64:
truth = val.Float() != 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
truth = val.Uint() != 0
case reflect.Struct:
truth = true // Struct values are always true.
default:
return
}
return truth, true
}
func reflectValue(f *reflect.StructField, v reflect.Value) *Ident {
ident := new(Ident)
// Evaluate primitive types.
switch f.Type.Kind() {
case reflect.String:
ident.Name = v.String()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
ident.Name = fmt.Sprint(v.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
ident.Name = fmt.Sprint(v.Uint())
case reflect.Float32, reflect.Float64:
ident.Name = fmt.Sprint(v.Float())
case reflect.Bool:
ident.Name = fmt.Sprint(v.Bool())
case reflect.Complex64, reflect.Complex128:
ident.Name = fmt.Sprint(v.Complex())
case reflect.Struct:
// Check for interface and custom types.
switch x := v.Interface().(type) {
case Identifier:
ident = x.Ident()
case time.Time:
ident.Name = chrono.Format(x)
case fmt.Stringer:
ident.Name = x.String()
}
case reflect.Interface, reflect.Ptr:
if v.IsNil() {
return nil
}
// Check for interface and custom types.
switch x := v.Interface().(type) {
case Identifier:
ident = x.Ident()
case time.Time:
ident.Name = chrono.Format(x)
case fmt.Stringer:
ident.Name = x.String()
}
default:
logrus.Debugf("origins: skipping unsupported field %s (%s type)", f.Name, f.Type.Kind())
return nil
}
return ident
}
func refToVal(ref reflect.Value) Value {
switch ref.Kind() {
case reflect.Bool:
return boolValue(ref.Bool())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return intValue(ref.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32,
reflect.Uint64, reflect.Uintptr:
return intValue(ref.Uint())
case reflect.Float32, reflect.Float64:
return floatValue(ref.Float())
case reflect.Complex64, reflect.Complex128:
return complexValue(ref.Complex())
case reflect.Array, reflect.Slice:
return arrayValue{reflectValue(ref)}
case reflect.Chan:
return chanValue{reflectValue(ref)}
case reflect.Map:
return mapValue{reflectValue(ref)}
case reflect.Ptr:
return pointerValue{reflectValue(ref)}
case reflect.String:
return stringValue(ref.String())
case reflect.Struct:
return structValue{reflectValue(ref)}
}
return nilValue(0)
}
func complex64Encoder(enc *encoder, v reflect.Value) error {
bs := enc.buf[:8]
x := v.Complex()
enc.order.PutUint32(bs, math.Float32bits(float32(real(x))))
enc.order.PutUint32(bs[4:], math.Float32bits(float32(imag(x))))
_, err := enc.Write(bs)
return err
}
func putReflect(b []byte, v reflect.Value) int {
v = reflect.Indirect(v)
switch v.Kind() {
case reflect.String:
s := v.String()
PutString(b, s)
return len(s) + 1
case reflect.Bool:
PutBool(b, v.Bool())
return 1
case reflect.Int:
PutInt(b, int(v.Int()))
return 8
case reflect.Uint:
PutUint(b, uint(v.Uint()))
return 8
case reflect.Int8:
PutInt8(b, int8(v.Int()))
case reflect.Uint8:
PutUint8(b, uint8(v.Uint()))
case reflect.Int16:
PutInt16(b, int16(v.Int()))
case reflect.Uint16:
PutUint16(b, uint16(v.Uint()))
case reflect.Int32:
PutInt32(b, int32(v.Int()))
case reflect.Uint32:
PutUint32(b, uint32(v.Uint()))
case reflect.Int64:
PutInt64(b, v.Int())
case reflect.Uint64:
PutUint64(b, v.Uint())
case reflect.Float32:
PutFloat32(b, float32(v.Float()))
case reflect.Float64:
PutFloat64(b, v.Float())
case reflect.Complex64:
PutComplex64(b, complex64(v.Complex()))
case reflect.Complex128:
PutComplex128(b, v.Complex())
case reflect.Struct:
sum := 0
for i, n := 0, v.NumField(); i < n; i++ {
s := putReflect(b[sum:], v.Field(i))
if s < 0 {
return -1
}
sum += s
}
if sum == 0 {
return -1
}
return sum
default:
return -1
}
return int(v.Type().Size())
}
// encComplex encodes the complex value (complex64 complex128) referenced by v.
// Complex numbers are just a pair of floating-point numbers, real part first.
func encComplex(i *encInstr, state *encoderState, v reflect.Value) {
c := v.Complex()
if c != 0+0i || state.sendZero {
rpart := floatBits(real(c))
ipart := floatBits(imag(c))
state.update(i)
state.encodeUint(rpart)
state.encodeUint(ipart)
}
}
func snapvalue(w io.Writer, v reflect.Value) {
var q string
switch v.Kind() {
case reflect.Bool: // Not addressable
q = strconv.FormatBool(v.Bool())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
q = strconv.FormatInt(v.Int(), 36)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
q = strconv.FormatUint(v.Uint(), 36)
case reflect.Uintptr:
panic("n/s")
case reflect.Float32, reflect.Float64:
q = strconv.FormatFloat(v.Float(), 'g', 65, 64)
case reflect.Complex64, reflect.Complex128:
c := v.Complex()
q = "(" + strconv.FormatFloat(real(c), 'g', 65, 64) + ", " + strconv.FormatFloat(imag(c), 'g', 65, 64) + "i)"
case reflect.Chan, reflect.Func, reflect.Map, reflect.Ptr, reflect.Slice, reflect.UnsafePointer: // Addressable
q = strconv.FormatUint(uint64(v.Pointer()), 36) // uintptr
case reflect.Interface:
d := v.InterfaceData() // [2]uintptr
q = "<" + strconv.FormatUint(uint64(d[0]), 36) + "," + strconv.FormatUint(uint64(d[1]), 36) + ">"
case reflect.String:
q = v.String()
case reflect.Array:
w.Write([]byte("{"))
for i := 0; i < v.Len(); i++ {
snapvalue(w, v.Index(i))
w.Write([]byte(","))
}
w.Write([]byte("}"))
return
case reflect.Struct:
w.Write([]byte("{"))
for i := 0; i < v.NumField(); i++ {
snapvalue(w, v.FieldByIndex([]int{i}))
w.Write([]byte(","))
}
w.Write([]byte("}"))
default:
panic("u")
}
w.Write([]byte(q))
}
func complex128Encoder(enc *encoder, v reflect.Value) error {
bs := enc.buf[:8]
x := v.Complex()
enc.order.PutUint64(bs, math.Float64bits(real(x)))
if _, err := enc.Write(bs); err != nil {
return err
}
enc.order.PutUint64(bs, math.Float64bits(imag(x)))
_, err := enc.Write(bs)
return err
}
func AsBool(value reflect.Value) bool {
if !value.IsValid() {
return false
}
switch value.Kind() {
case reflect.Int:
fallthrough
case reflect.Int16:
fallthrough
case reflect.Int32:
fallthrough
case reflect.Int64:
return value.Int() != 0
case reflect.Uint:
fallthrough
case reflect.Uint16:
fallthrough
case reflect.Uint32:
fallthrough
case reflect.Uint64:
return value.Uint() != 0
case reflect.Float32:
fallthrough
case reflect.Float64:
return value.Float() != 0.0
case reflect.Complex64:
fallthrough
case reflect.Complex128:
return value.Complex() != complex128(0)
case reflect.Bool:
return value.Bool()
case reflect.String:
fallthrough
case reflect.Map:
fallthrough
case reflect.Array:
fallthrough
case reflect.Slice:
return value.Len() != 0
case reflect.Ptr:
if value.Elem().Kind() != reflect.Struct {
return false
}
fallthrough
case reflect.Struct:
return true
case reflect.Func:
return true
}
log.Println("Not Support kind=" + value.Kind().String())
return false
}
func formatValue(value reflect.Value, indentation uint) string {
if indentation > maxIndent {
return "Too deep for me, man..."
}
if isNilValue(value) {
return "nil"
}
switch value.Kind() {
case reflect.Bool:
return fmt.Sprintf("%v", value.Bool())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return fmt.Sprintf("%v", value.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return fmt.Sprintf("%v", value.Uint())
case reflect.Uintptr:
return fmt.Sprintf("0x%x", value.Uint())
case reflect.Float32, reflect.Float64:
return fmt.Sprintf("%v", value.Float())
case reflect.Complex64, reflect.Complex128:
return fmt.Sprintf("%v", value.Complex())
case reflect.Chan:
return fmt.Sprintf("0x%x", value.Pointer())
case reflect.Func:
return fmt.Sprintf("0x%x", value.Pointer())
case reflect.Ptr:
return formatValue(value.Elem(), indentation)
case reflect.Slice:
if value.Type().Elem().Kind() == reflect.Uint8 {
return formatString(value.Bytes(), indentation)
}
return formatSlice(value, indentation)
case reflect.String:
return formatString(value.String(), indentation)
case reflect.Array:
return formatSlice(value, indentation)
case reflect.Map:
return formatMap(value, indentation)
case reflect.Struct:
return formatStruct(value, indentation)
case reflect.Interface:
return formatValue(value.Elem(), indentation)
default:
if value.CanInterface() {
return fmt.Sprintf("%#v", value.Interface())
} else {
return fmt.Sprintf("%#v", value)
}
}
}
// keyEqual compares a and b for equality.
// Both a and b must be valid map keys.
func keyEqual(av, bv reflect.Value) bool {
if !av.IsValid() && !bv.IsValid() {
return true
}
if !av.IsValid() || !bv.IsValid() || av.Type() != bv.Type() {
return false
}
switch kind := av.Kind(); kind {
case reflect.Bool:
a, b := av.Bool(), bv.Bool()
return a == b
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
a, b := av.Int(), bv.Int()
return a == b
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
a, b := av.Uint(), bv.Uint()
return a == b
case reflect.Float32, reflect.Float64:
a, b := av.Float(), bv.Float()
return a == b
case reflect.Complex64, reflect.Complex128:
a, b := av.Complex(), bv.Complex()
return a == b
case reflect.Array:
for i := 0; i < av.Len(); i++ {
if !keyEqual(av.Index(i), bv.Index(i)) {
return false
}
}
return true
case reflect.Chan, reflect.UnsafePointer, reflect.Ptr:
a, b := av.Pointer(), bv.Pointer()
return a == b
case reflect.Interface:
return keyEqual(av.Elem(), bv.Elem())
case reflect.String:
a, b := av.String(), bv.String()
return a == b
case reflect.Struct:
for i := 0; i < av.NumField(); i++ {
if !keyEqual(av.Field(i), bv.Field(i)) {
return false
}
}
return true
default:
panic("invalid map key type " + av.Type().String())
}
}
func evalUnaryComplexExpr(ctx *Ctx, x reflect.Value, op token.Token) (reflect.Value, error) {
var err error
var r complex128
xx := x.Complex()
switch op {
case token.ADD:
r = +xx
case token.SUB:
r = -xx
default:
panic("eval: impossible unary op " + op.String())
}
return reflect.ValueOf(r).Convert(x.Type()), err
}
func (mw *Writer) writeVal(v reflect.Value) error {
if !isSupported(v.Kind()) {
return fmt.Errorf("msgp: msgp/enc: type %q not supported", v.Type())
}
// shortcut for nil values
if v.IsNil() {
return mw.WriteNil()
}
switch v.Kind() {
case reflect.Bool:
return mw.WriteBool(v.Bool())
case reflect.Float32, reflect.Float64:
return mw.WriteFloat64(v.Float())
case reflect.Complex64, reflect.Complex128:
return mw.WriteComplex128(v.Complex())
case reflect.Int, reflect.Int16, reflect.Int32, reflect.Int64, reflect.Int8:
return mw.WriteInt64(v.Int())
case reflect.Interface, reflect.Ptr:
if v.IsNil() {
mw.WriteNil()
}
return mw.writeVal(v.Elem())
case reflect.Map:
return mw.writeMap(v)
case reflect.Uint, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uint8:
return mw.WriteUint64(v.Uint())
case reflect.String:
return mw.WriteString(v.String())
case reflect.Slice, reflect.Array:
return mw.writeSlice(v)
case reflect.Struct:
return mw.writeStruct(v)
}
return fmt.Errorf("msgp: msgp/enc: type %q not supported", v.Type())
}
func convertNumbersToSameType(leftValue reflect.Value, leftKind reflect.Kind, rightValue reflect.Value, rightKind reflect.Kind) (interface{}, interface{}, Type) {
if isInt(leftKind) {
if isInt(rightKind) {
return leftValue.Int(), rightValue.Int(), Int64
} else if isFloat(rightKind) {
return float64(leftValue.Int()), rightValue.Float(), Float64
}
} else if isFloat(leftKind) {
if isInt(rightKind) {
return leftValue.Float(), float64(rightValue.Int()), Float64
} else if isFloat(rightKind) {
return leftValue.Float(), rightValue.Float(), Float64
}
} else if isComplex(leftKind) && isComplex(rightKind) {
return leftValue.Complex(), rightValue.Complex(), Complex128
}
return nil, nil, Unknown
}
func asInterface(v reflect.Value) interface{} {
switch v.Kind() {
case reflect.Bool:
return v.Bool()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int()
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return v.Uint()
case reflect.Float32, reflect.Float64:
return v.Float()
case reflect.Complex64, reflect.Complex128:
return v.Complex()
case reflect.String:
return v.String()
default:
return v.Interface()
}
}
func printValue(v reflect.Value) string {
switch v.Kind() {
case reflect.Bool:
return fmt.Sprintf("%t", v.Bool())
case reflect.String:
return v.String()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return fmt.Sprintf("%d", v.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return fmt.Sprintf("%d", v.Uint())
case reflect.Float32, reflect.Float64:
return fmt.Sprintf("%f", v.Float())
case reflect.Complex64, reflect.Complex128:
return fmt.Sprintf("%+v", v.Complex())
default:
return fmt.Sprintf("<printVal: %v>", v)
}
}
// Assumes y is assignable to x, panics otherwise
func evalBinaryComplexExpr(ctx *Ctx, x reflect.Value, op token.Token, y reflect.Value) (reflect.Value, error) {
var err error
var r complex128
xx, yy := x.Complex(), y.Complex()
switch op {
case token.ADD:
r = xx + yy
case token.SUB:
r = xx - yy
case token.MUL:
r = xx * yy
case token.QUO:
r = xx / yy
default:
err = ErrInvalidOperands{x, op, y}
}
return reflect.ValueOf(r).Convert(x.Type()), err
}
func checkAgainstFloat64(e float64, c reflect.Value) (err error) {
err = errors.New("")
ck := c.Kind()
switch {
case isSignedInteger(c):
if float64(c.Int()) == e {
err = nil
}
case isUnsignedInteger(c):
if float64(c.Uint()) == e {
err = nil
}
// If the actual value is lower precision, turn the comparison around so we
// apply the low-precision rules. Otherwise, e.g. Equals(0.1) may not match
// float32(0.1).
case ck == reflect.Float32 || ck == reflect.Complex64:
return Equals(c.Interface()).Matches(e)
// Otherwise, compare with double precision.
case isFloat(c):
if c.Float() == e {
err = nil
}
case isComplex(c):
comp := c.Complex()
rl := real(comp)
im := imag(comp)
if im == 0 && rl == e {
err = nil
}
default:
err = NewFatalError("which is not numeric")
}
return
}
// isZero returns whether the value is the zero of its type.
func isZero(val reflect.Value) bool {
switch val.Kind() {
case reflect.Array, reflect.Map, reflect.Slice, reflect.String:
return val.Len() == 0
case reflect.Bool:
return !val.Bool()
case reflect.Complex64, reflect.Complex128:
return val.Complex() == 0
case reflect.Chan, reflect.Func, reflect.Ptr:
return val.IsNil()
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return val.Int() == 0
case reflect.Float32, reflect.Float64:
return val.Float() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return val.Uint() == 0
}
panic("unknown type in isZero " + val.Type().String())
}
// IsDefaultValue calls SmartCastDefaultValuer to tedect if v in any kind implements
// DefaultValuer. If this is the case, then DefaultValuer.IsDefault will be returned.
// If v does not implement DefaultValuer, then the result of a comparison with the
// zero value of the type will be returned.
func IsDefaultValue(v reflect.Value) bool {
if defaultValuer, ok := SmartCastDefaultValuer(v); ok {
return defaultValuer.IsDefault()
}
switch v.Kind() {
case reflect.String:
return v.Len() == 0
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v.Int() == 0
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return v.Uint() == 0
case reflect.Float32, reflect.Float64:
return v.Float() == 0
case reflect.Complex64, reflect.Complex128:
return v.Complex() == complex(0, 0)
case reflect.Bool:
return v.Bool() == false
case reflect.Chan, reflect.Func, reflect.Interface, reflect.Slice, reflect.Map:
return v.IsNil()
case reflect.Ptr:
return v.IsNil() || IsDefaultValue(v.Elem())
case reflect.Struct:
for i := 0; i < v.NumField(); i++ {
if !IsDefaultValue(v.Field(i)) {
return false
}
}
return true
}
panic("never reached")
}