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package main
import "time"
func main() {
thing := &Thing{"foo"}
println("thing:", thing.String())
thing.Print()
printItf(5)
printItf(byte('x'))
printItf("foo")
printItf(Foo(18))
printItf(*thing)
printItf(thing)
printItf(Stringer(thing))
printItf(struct{ n int }{})
printItf(struct {
n int `foo:"bar"`
}{})
printItf(Number(3))
array := Array([4]uint32{1, 7, 11, 13})
printItf(array)
printItf(ArrayStruct{3, array})
printItf(SmallPair{3, 5})
s := Stringer(thing)
println("Stringer.String():", s.String())
var itf interface{} = s
println("Stringer.(*Thing).String():", itf.(Stringer).String())
if s, ok := s.(interface{ String() string }); ok {
println("s has String() method:", s.String())
}
println("nested switch:", nestedSwitch('v', 3))
// Try putting a linked list in an interface:
// https://github.com/tinygo-org/tinygo/issues/309
itf = linkedList{}
// Test bugfix for assertion on named empty interface:
// https://github.com/tinygo-org/tinygo/issues/453
_, _ = itf.(Empty)
var n int
var f float32
var interfaceEqualTests = []struct {
equal bool
lhs interface{}
rhs interface{}
}{
{true, true, true},
{true, int(1), int(1)},
{true, int8(1), int8(1)},
{true, int16(1), int16(1)},
{true, int32(1), int32(1)},
{true, int64(1), int64(1)},
{true, uint(1), uint(1)},
{false, uint(1), uint(2)},
{true, uint8(1), uint8(1)},
{true, uint16(1), uint16(1)},
{true, uint32(1), uint32(1)},
{true, uint64(1), uint64(1)},
{true, uintptr(1), uintptr(1)},
{true, float32(1.1), float32(1.1)},
{true, float64(1.1), float64(1.1)},
{true, complex(100, 8), complex(100, 8)},
{false, complex(100, 8), complex(101, 8)},
{false, complex(100, 8), complex(100, 9)},
{true, complex64(8), complex64(8)},
{true, complex128(8), complex128(8)},
{true, "string", "string"},
{false, "string", "stringx"},
{true, [2]int16{-5, 201}, [2]int16{-5, 201}},
{false, [2]int16{-5, 201}, [2]int16{-5, 202}},
{false, [2]int16{-5, 201}, [2]int16{5, 201}},
{true, &n, &n},
{false, &n, new(int)},
{false, new(int), new(int)},
{false, &n, &f},
{true, struct {
a int
b int
}{3, 5}, struct {
a int
b int
}{3, 5}},
{false, struct {
a int
b int
}{3, 5}, struct {
a int
b int
}{3, 6}},
}
for i, tc := range interfaceEqualTests {
if (tc.lhs == tc.rhs) != tc.equal {
println("test", i, "of interfaceEqualTests failed")
}
}
// test interface blocking
blockDynamic(NonBlocker{})
println("non-blocking call on sometimes-blocking interface")
blockDynamic(SleepBlocker(time.Millisecond))
println("slept 1ms")
blockStatic(SleepBlocker(time.Millisecond))
println("slept 1ms")
}
func printItf(val interface{}) {
switch val := val.(type) {
case Unmatched:
panic("matched the unmatchable")
case Doubler:
println("is Doubler:", val.Double())
case Tuple:
println("is Tuple:", val.Nth(0), val.Nth(1), val.Nth(2), val.Nth(3))
val.Print()
case int:
println("is int:", val)
case byte:
println("is byte:", val)
case string:
println("is string:", val)
case Thing:
println("is Thing:", val.String())
case *Thing:
println("is *Thing:", val.String())
case struct{ i int }:
println("is struct{i int}")
case struct{ n int }:
println("is struct{n int}")
case struct {
n int `foo:"bar"`
}:
println("is struct{n int `foo:\"bar\"`}")
case Foo:
println("is Foo:", val)
default:
println("is ?")
}
}
var (
// Test for type assert support in the interp package.
globalThing interface{} = Foo(3)
_ = globalThing.(Foo)
)
func nestedSwitch(verb rune, arg interface{}) bool {
switch verb {
case 'v', 's':
switch arg.(type) {
case int:
return true
}
}
return false
}
func blockDynamic(blocker DynamicBlocker) {
blocker.Block()
}
func blockStatic(blocker StaticBlocker) {
blocker.Sleep()
}
type Thing struct {
name string
}
func (t Thing) String() string {
return t.name
}
func (t Thing) Print() {
println("Thing.Print:", t.name)
}
type Stringer interface {
String() string
}
type Foo int
type Number int
func (n Number) Double() int {
return int(n) * 2
}
type Doubler interface {
Double() int
}
type Tuple interface {
Nth(int) uint32
Print()
}
type Array [4]uint32
func (a Array) Nth(n int) uint32 {
return a[n]
}
func (a Array) Print() {
println("Array len:", len(a))
}
type ArrayStruct struct {
n int
a Array
}
func (a ArrayStruct) Nth(n int) uint32 {
return a.a[n]
}
func (a ArrayStruct) Print() {
println("ArrayStruct.Print:", len(a.a), a.n)
}
type SmallPair struct {
a byte
b byte
}
func (p SmallPair) Nth(n int) uint32 {
return uint32(int(p.a)*n + int(p.b)*n)
}
func (p SmallPair) Print() {
println("SmallPair.Print:", p.a, p.b)
}
// There is no type that matches this method.
type Unmatched interface {
NeverImplementedMethod()
}
type linkedList struct {
addr *linkedList
}
type DynamicBlocker interface {
Block()
}
type NonBlocker struct{}
func (b NonBlocker) Block() {}
type SleepBlocker time.Duration
func (s SleepBlocker) Block() {
time.Sleep(time.Duration(s))
}
func (s SleepBlocker) Sleep() {
s.Block()
}
type StaticBlocker interface {
Sleep()
}
type Empty interface{}
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