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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: 2025 The Ebitengine Authors
package objc_test
import (
"fmt"
"testing"
"github.com/ebitengine/purego"
"github.com/ebitengine/purego/objc"
)
func ExampleNewBlock() {
_, err := purego.Dlopen("/System/Library/Frameworks/Foundation.framework/Foundation", purego.RTLD_GLOBAL|purego.RTLD_NOW)
if err != nil {
panic(err)
}
var count = 0
block := objc.NewBlock(
func(block objc.Block, line objc.ID, stop *bool) {
count++
fmt.Printf("LINE %d: %s\n", count, objc.Send[string](line, objc.RegisterName("UTF8String")))
*stop = count == 3
},
)
defer block.Release()
lines := objc.ID(objc.GetClass("NSString")).Send(objc.RegisterName("stringWithUTF8String:"), "Alpha\nBeta\nGamma\nDelta\nEpsilon")
defer lines.Send(objc.RegisterName("release"))
lines.Send(objc.RegisterName("enumerateLinesUsingBlock:"), block)
// Output:
// LINE 1: Alpha
// LINE 2: Beta
// LINE 3: Gamma
}
func ExampleInvokeBlock() {
type vector struct {
X, Y, Z float64
}
block := objc.NewBlock(
func(block objc.Block, v1, v2 *vector) *vector {
return &vector{
X: v1.Y*v2.Z - v1.Z*v2.Y,
Y: v1.Z*v2.X - v1.X*v2.Z,
Z: v1.X*v2.Y - v1.Y*v2.X,
}
},
)
defer block.Release()
result, err := objc.InvokeBlock[*vector](
block,
&vector{X: 0.1, Y: 2.3, Z: 4.5},
&vector{X: 6.7, Y: 8.9, Z: 0.1},
)
fmt.Println(*result, err)
// Output: {-39.82 30.14 -14.52} <nil>
}
func TestInvoke(t *testing.T) {
t.Run("return an error when passing an invalid number of arguments", func(t *testing.T) {
block := objc.NewBlock(func(_ objc.Block, a int32, b int32) int32 {
return a + b
})
defer block.Release()
if _, err := objc.InvokeBlock[int32](block, int32(8)); err == nil {
t.Fatal(err)
}
})
t.Run("return an error when passing an invalid return type", func(t *testing.T) {
block := objc.NewBlock(func(_ objc.Block, a int32, b int32) int32 {
return a + b
})
defer block.Release()
if _, err := objc.InvokeBlock[string](block, int32(8), int32(2)); err == nil {
t.Fatal(err)
}
})
t.Run("add two int32's and returns the result", func(t *testing.T) {
block := objc.NewBlock(func(_ objc.Block, a int32, b int32) int32 {
return a + b
})
defer block.Release()
result, err := objc.InvokeBlock[int32](block, int32(8), int32(2))
if err != nil {
t.Fatal(err)
}
if result != 10 {
t.Fatalf("expected 10, got %d", result)
}
})
t.Run("add two int32's and store the result in a variable", func(t *testing.T) {
var result int32
block := objc.NewBlock(func(_ objc.Block, a int32, b int32) {
result = a + b
})
defer block.Release()
block.Invoke(int32(8), int32(2))
if result != 10 {
t.Fatalf("expected 10, got %d", result)
}
})
}
func TestBlockCopyAndBlockRelease(t *testing.T) {
t.Parallel()
var refCount int
block := objc.NewBlock(
func(objc.Block) {
refCount++
},
)
defer block.Release()
refCount++
copies := make([]objc.Block, 17)
copies[0] = block
for index := 1; index < len(copies); index++ {
if refCount != index {
t.Fatalf("refCount: %d != %d", refCount, index)
}
copies[index] = copies[index-1].Copy()
if copies[index] != block {
t.Fatalf("Block.Copy(): %v != %v", copies[index], block)
}
copies[index].Invoke()
}
for _, copy := range copies[1:] {
copy.Release()
refCount--
}
refCount--
block.Invoke()
if refCount != 1 {
t.Fatalf("refCount: %d != 1", refCount)
}
}
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