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bridge: add ScopeFacade receiver overloads for binder callbacks

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This commit is contained in:
Sergey Chernov 2026-03-14 19:53:46 +03:00
parent 65edf9fe67
commit 8a32ffe655
6 changed files with 212 additions and 62 deletions
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20
docs/embedding.md
View File

@ -261,14 +261,14 @@ moduleScope.eval("class Counter { extern var value: Int; extern fun inc(by: Int)
moduleScope.bind("Counter") { moduleScope.bind("Counter") {
addVar( addVar(
name = "value", name = "value",
get = { _, self -> self.readField(this, "value").value }, get = { thisObj.readField(this, "value").value },
set = { _, self, v -> self.writeField(this, "value", v) } set = { v -> thisObj.writeField(this, "value", v) }
) )
addFun("inc") { _, self, args -> addFun("inc") {
val by = args.requiredArg<ObjInt>(0).value val by = args.requiredArg<ObjInt>(0).value
val current = self.readField(this, "value").value as ObjInt val current = thisObj.readField(this, "value").value as ObjInt
val next = ObjInt(current.value + by) val next = ObjInt(current.value + by)
self.writeField(this, "value", next) thisObj.writeField(this, "value", next)
next next
} }
} }
@ -303,16 +303,16 @@ moduleScope.eval("""
moduleScope.bindObject("HostObject") { moduleScope.bindObject("HostObject") {
classData = "OK" classData = "OK"
init { _ -> data = 0L } init { _ -> data = 0L }
addFun("add") { _, _, args -> addFun("add") {
val a = args.requiredArg<ObjInt>(0).value val a = args.requiredArg<ObjInt>(0).value
val b = args.requiredArg<ObjInt>(1).value val b = args.requiredArg<ObjInt>(1).value
ObjInt.of(a + b) ObjInt.of(a + b)
} }
addVal("status") { _, _ -> ObjString(classData as String) } addVal("status") { ObjString(classData as String) }
addVar( addVar(
"count", "count",
get = { _, inst -> ObjInt.of((inst as ObjInstance).data as Long) }, get = { ObjInt.of((thisObj as ObjInstance).data as Long) },
set = { _, inst, value -> (inst as ObjInstance).data = (value as ObjInt).value } set = { value -> (thisObj as ObjInstance).data = (value as ObjInt).value }
) )
} }
``` ```
@ -336,7 +336,7 @@ moduleScope.eval("""
""".trimIndent()) """.trimIndent())
moduleScope.bindObject("HostObject") { moduleScope.bindObject("HostObject") {
addFun("ping") { _, _, _ -> ObjInt.of(7) } addFun("ping") { ObjInt.of(7) }
} }
``` ```

170
lynglib/src/commonMain/kotlin/net/sergeych/lyng/bridge/ClassBridge.kt
View File

@ -60,12 +60,54 @@ interface ClassBridgeBinder {
/** Register an initialization hook that runs for each instance. */ /** Register an initialization hook that runs for each instance. */
fun init(block: suspend BridgeInstanceContext.(ScopeFacade) -> Unit) fun init(block: suspend BridgeInstanceContext.(ScopeFacade) -> Unit)
/** Register an initialization hook with direct access to the instance. */ /** Register an initialization hook with direct access to the instance. */
fun initWithInstance(block: suspend ScopeFacade.() -> Unit)
/**
* Legacy initWithInstance form.
* Prefer [initWithInstance] with [ScopeFacade] receiver and use [ScopeFacade.thisObj].
*/
@Deprecated(
message = "Use initWithInstance { ... } with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith("initWithInstance { block(this, thisObj) }")
)
fun initWithInstance(block: suspend (ScopeFacade, Obj) -> Unit) fun initWithInstance(block: suspend (ScopeFacade, Obj) -> Unit)
/** Bind a Lyng function/member to a Kotlin implementation (requires `extern` in Lyng). */ /** Bind a Lyng function/member to a Kotlin implementation (requires `extern` in Lyng). */
fun addFun(name: String, impl: suspend ScopeFacade.() -> Obj)
/**
* Legacy addFun form.
* Prefer [addFun] with [ScopeFacade] receiver and use [ScopeFacade.thisObj]/[ScopeFacade.args].
*/
@Deprecated(
message = "Use addFun(name) { ... } with ScopeFacade receiver; use thisObj/args from scope",
replaceWith = ReplaceWith("addFun(name) { impl(this, thisObj, args) }")
)
fun addFun(name: String, impl: suspend (ScopeFacade, Obj, Arguments) -> Obj) fun addFun(name: String, impl: suspend (ScopeFacade, Obj, Arguments) -> Obj)
/** Bind a read-only member (val/property getter) declared as `extern`. */ /** Bind a read-only member (val/property getter) declared as `extern`. */
fun addVal(name: String, impl: suspend ScopeFacade.() -> Obj)
/**
* Legacy addVal form.
* Prefer [addVal] with [ScopeFacade] receiver and use [ScopeFacade.thisObj].
*/
@Deprecated(
message = "Use addVal(name) { ... } with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith("addVal(name) { impl(this, thisObj) }")
)
fun addVal(name: String, impl: suspend (ScopeFacade, Obj) -> Obj) fun addVal(name: String, impl: suspend (ScopeFacade, Obj) -> Obj)
/** Bind a mutable member (var/property getter/setter) declared as `extern`. */ /** Bind a mutable member (var/property getter/setter) declared as `extern`. */
fun addVar(
name: String,
get: suspend ScopeFacade.() -> Obj,
set: suspend ScopeFacade.(Obj) -> Unit
)
/**
* Legacy addVar form.
* Prefer [addVar] with [ScopeFacade] receiver and use [ScopeFacade.thisObj].
*/
@Deprecated(
message = "Use addVar(name, get, set) with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith(
"addVar(name, get = { get(this, thisObj) }, set = { value -> set(this, thisObj, value) })"
)
)
fun addVar( fun addVar(
name: String, name: String,
get: suspend (ScopeFacade, Obj) -> Obj, get: suspend (ScopeFacade, Obj) -> Obj,
@ -234,17 +276,27 @@ private class ClassBridgeBinderImpl(
} }
} }
override fun initWithInstance(block: suspend ScopeFacade.() -> Unit) {
initHooks.add { scope, _ ->
scope.block()
}
}
@Deprecated(
message = "Use initWithInstance { ... } with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith("initWithInstance { block(this, thisObj) }")
)
override fun initWithInstance(block: suspend (ScopeFacade, Obj) -> Unit) { override fun initWithInstance(block: suspend (ScopeFacade, Obj) -> Unit) {
initHooks.add { scope, inst -> initHooks.add { scope, inst ->
block(scope, inst) block(scope, inst)
} }
} }
override fun addFun(name: String, impl: suspend (ScopeFacade, Obj, Arguments) -> Obj) { override fun addFun(name: String, impl: suspend ScopeFacade.() -> Obj) {
ensureTemplateNotBuilt() ensureTemplateNotBuilt()
val target = findMember(name) val target = findMember(name)
val callable = ObjExternCallable.fromBridge { val callable = ObjExternCallable.fromBridge {
impl(this, thisObj, args) impl()
} }
val methodId = cls.ensureMethodIdForBridge(name, target.record) val methodId = cls.ensureMethodIdForBridge(name, target.record)
val newRecord = target.record.copy( val newRecord = target.record.copy(
@ -255,14 +307,24 @@ private class ClassBridgeBinderImpl(
replaceMember(target, newRecord) replaceMember(target, newRecord)
} }
override fun addVal(name: String, impl: suspend (ScopeFacade, Obj) -> Obj) { @Deprecated(
message = "Use addFun(name) { ... } with ScopeFacade receiver; use thisObj/args from scope",
replaceWith = ReplaceWith("addFun(name) { impl(this, thisObj, args) }")
)
override fun addFun(name: String, impl: suspend (ScopeFacade, Obj, Arguments) -> Obj) {
addFun(name) {
impl(this, thisObj, args)
}
}
override fun addVal(name: String, impl: suspend ScopeFacade.() -> Obj) {
ensureTemplateNotBuilt() ensureTemplateNotBuilt()
val target = findMember(name) val target = findMember(name)
if (target.record.isMutable) { if (target.record.isMutable) {
throw ScriptError(Pos.builtIn, "extern val $name is mutable in class ${cls.className}") throw ScriptError(Pos.builtIn, "extern val $name is mutable in class ${cls.className}")
} }
val getter = ObjExternCallable.fromBridge { val getter = ObjExternCallable.fromBridge {
impl(this, thisObj) impl()
} }
val prop = ObjProperty(name, getter, null) val prop = ObjProperty(name, getter, null)
val isFieldLike = target.record.type == ObjRecord.Type.Field || val isFieldLike = target.record.type == ObjRecord.Type.Field ||
@ -287,10 +349,20 @@ private class ClassBridgeBinderImpl(
replaceMember(target, newRecord) replaceMember(target, newRecord)
} }
@Deprecated(
message = "Use addVal(name) { ... } with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith("addVal(name) { impl(this, thisObj) }")
)
override fun addVal(name: String, impl: suspend (ScopeFacade, Obj) -> Obj) {
addVal(name) {
impl(this, thisObj)
}
}
override fun addVar( override fun addVar(
name: String, name: String,
get: suspend (ScopeFacade, Obj) -> Obj, get: suspend ScopeFacade.() -> Obj,
set: suspend (ScopeFacade, Obj, Obj) -> Unit set: suspend ScopeFacade.(Obj) -> Unit
) { ) {
ensureTemplateNotBuilt() ensureTemplateNotBuilt()
val target = findMember(name) val target = findMember(name)
@ -298,11 +370,11 @@ private class ClassBridgeBinderImpl(
throw ScriptError(Pos.builtIn, "extern var $name is readonly in class ${cls.className}") throw ScriptError(Pos.builtIn, "extern var $name is readonly in class ${cls.className}")
} }
val getter = ObjExternCallable.fromBridge { val getter = ObjExternCallable.fromBridge {
get(this, thisObj) get()
} }
val setter = ObjExternCallable.fromBridge { val setter = ObjExternCallable.fromBridge {
val value = requiredArg<Obj>(0) val value = requiredArg<Obj>(0)
set(this, thisObj, value) set(value)
ObjVoid ObjVoid
} }
val prop = ObjProperty(name, getter, setter) val prop = ObjProperty(name, getter, setter)
@ -328,6 +400,24 @@ private class ClassBridgeBinderImpl(
replaceMember(target, newRecord) replaceMember(target, newRecord)
} }
@Deprecated(
message = "Use addVar(name, get, set) with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith(
"addVar(name, get = { get(this, thisObj) }, set = { value -> set(this, thisObj, value) })"
)
)
override fun addVar(
name: String,
get: suspend (ScopeFacade, Obj) -> Obj,
set: suspend (ScopeFacade, Obj, Obj) -> Unit
) {
addVar(
name,
get = { get(this, thisObj) },
set = { value -> set(this, thisObj, value) }
)
}
fun commit() { fun commit() {
if (initHooks.isNotEmpty()) { if (initHooks.isNotEmpty()) {
val target = cls.bridgeInitHooks ?: mutableListOf<suspend (ScopeFacade, ObjInstance) -> Unit>().also { val target = cls.bridgeInitHooks ?: mutableListOf<suspend (ScopeFacade, ObjInstance) -> Unit>().also {
@ -399,16 +489,26 @@ private class ObjectBridgeBinderImpl(
} }
} }
override fun initWithInstance(block: suspend ScopeFacade.() -> Unit) {
initHooks.add { scope, _ ->
scope.block()
}
}
@Deprecated(
message = "Use initWithInstance { ... } with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith("initWithInstance { block(this, thisObj) }")
)
override fun initWithInstance(block: suspend (ScopeFacade, Obj) -> Unit) { override fun initWithInstance(block: suspend (ScopeFacade, Obj) -> Unit) {
initHooks.add { scope, inst -> initHooks.add { scope, inst ->
block(scope, inst) block(scope, inst)
} }
} }
override fun addFun(name: String, impl: suspend (ScopeFacade, Obj, Arguments) -> Obj) { override fun addFun(name: String, impl: suspend ScopeFacade.() -> Obj) {
val target = findMember(name) val target = findMember(name)
val callable = ObjExternCallable.fromBridge { val callable = ObjExternCallable.fromBridge {
impl(this, thisObj, args) impl()
} }
val methodId = cls.ensureMethodIdForBridge(name, target.record) val methodId = cls.ensureMethodIdForBridge(name, target.record)
val newRecord = target.record.copy( val newRecord = target.record.copy(
@ -420,13 +520,23 @@ private class ObjectBridgeBinderImpl(
updateInstanceMember(target, newRecord) updateInstanceMember(target, newRecord)
} }
override fun addVal(name: String, impl: suspend (ScopeFacade, Obj) -> Obj) { @Deprecated(
message = "Use addFun(name) { ... } with ScopeFacade receiver; use thisObj/args from scope",
replaceWith = ReplaceWith("addFun(name) { impl(this, thisObj, args) }")
)
override fun addFun(name: String, impl: suspend (ScopeFacade, Obj, Arguments) -> Obj) {
addFun(name) {
impl(this, thisObj, args)
}
}
override fun addVal(name: String, impl: suspend ScopeFacade.() -> Obj) {
val target = findMember(name) val target = findMember(name)
if (target.record.isMutable) { if (target.record.isMutable) {
throw ScriptError(Pos.builtIn, "extern val $name is mutable in class ${cls.className}") throw ScriptError(Pos.builtIn, "extern val $name is mutable in class ${cls.className}")
} }
val getter = ObjExternCallable.fromBridge { val getter = ObjExternCallable.fromBridge {
impl(this, thisObj) impl()
} }
val prop = ObjProperty(name, getter, null) val prop = ObjProperty(name, getter, null)
val isFieldLike = target.record.type == ObjRecord.Type.Field || val isFieldLike = target.record.type == ObjRecord.Type.Field ||
@ -452,21 +562,31 @@ private class ObjectBridgeBinderImpl(
updateInstanceMember(target, newRecord) updateInstanceMember(target, newRecord)
} }
@Deprecated(
message = "Use addVal(name) { ... } with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith("addVal(name) { impl(this, thisObj) }")
)
override fun addVal(name: String, impl: suspend (ScopeFacade, Obj) -> Obj) {
addVal(name) {
impl(this, thisObj)
}
}
override fun addVar( override fun addVar(
name: String, name: String,
get: suspend (ScopeFacade, Obj) -> Obj, get: suspend ScopeFacade.() -> Obj,
set: suspend (ScopeFacade, Obj, Obj) -> Unit set: suspend ScopeFacade.(Obj) -> Unit
) { ) {
val target = findMember(name) val target = findMember(name)
if (!target.record.isMutable) { if (!target.record.isMutable) {
throw ScriptError(Pos.builtIn, "extern var $name is readonly in class ${cls.className}") throw ScriptError(Pos.builtIn, "extern var $name is readonly in class ${cls.className}")
} }
val getter = ObjExternCallable.fromBridge { val getter = ObjExternCallable.fromBridge {
get(this, thisObj) get()
} }
val setter = ObjExternCallable.fromBridge { val setter = ObjExternCallable.fromBridge {
val value = requiredArg<Obj>(0) val value = requiredArg<Obj>(0)
set(this, thisObj, value) set(value)
ObjVoid ObjVoid
} }
val prop = ObjProperty(name, getter, setter) val prop = ObjProperty(name, getter, setter)
@ -493,6 +613,24 @@ private class ObjectBridgeBinderImpl(
updateInstanceMember(target, newRecord) updateInstanceMember(target, newRecord)
} }
@Deprecated(
message = "Use addVar(name, get, set) with ScopeFacade receiver; use thisObj from scope",
replaceWith = ReplaceWith(
"addVar(name, get = { get(this, thisObj) }, set = { value -> set(this, thisObj, value) })"
)
)
override fun addVar(
name: String,
get: suspend (ScopeFacade, Obj) -> Obj,
set: suspend (ScopeFacade, Obj, Obj) -> Unit
) {
addVar(
name,
get = { get(this, thisObj) },
set = { value -> set(this, thisObj, value) }
)
}
suspend fun commit() { suspend fun commit() {
if (initHooks.isNotEmpty()) { if (initHooks.isNotEmpty()) {
val target = cls.bridgeInitHooks ?: mutableListOf<suspend (ScopeFacade, ObjInstance) -> Unit>().also { val target = cls.bridgeInitHooks ?: mutableListOf<suspend (ScopeFacade, ObjInstance) -> Unit>().also {

12
lynglib/src/commonMain/kotlin/net/sergeych/lyng/obj/ObjKotlinIterator.kt
View File

@ -45,18 +45,18 @@ class ObjKotlinIterator(val iterator: Iterator<Any?>) : Obj() {
} }
boundType = cls boundType = cls
LyngClassBridge.bind(cls) { LyngClassBridge.bind(cls) {
addFun("next") { scope, self, _ -> addFun("next") {
when (self) { when (val self = thisObj) {
is ObjKotlinIterator -> self.iterator.next().toObj() is ObjKotlinIterator -> self.iterator.next().toObj()
is ObjKotlinObjIterator -> self.iterator.next() is ObjKotlinObjIterator -> self.iterator.next()
else -> scope.raiseClassCastError("Expected KotlinIterator, got ${self.objClass.className}") else -> raiseClassCastError("Expected KotlinIterator, got ${self.objClass.className}")
} }
} }
addFun("hasNext") { scope, self, _ -> addFun("hasNext") {
when (self) { when (val self = thisObj) {
is ObjKotlinIterator -> self.iterator.hasNext().toObj() is ObjKotlinIterator -> self.iterator.hasNext().toObj()
is ObjKotlinObjIterator -> self.iterator.hasNext().toObj() is ObjKotlinObjIterator -> self.iterator.hasNext().toObj()
else -> scope.raiseClassCastError("Expected KotlinIterator, got ${self.objClass.className}") else -> raiseClassCastError("Expected KotlinIterator, got ${self.objClass.className}")
} }
} }
} }

42
lynglib/src/commonTest/kotlin/BridgeBindingTest.kt
View File

@ -61,39 +61,39 @@ class BridgeBindingTest {
init { _ -> init { _ ->
data = CounterState(0) data = CounterState(0)
} }
addFun("add") { _, _, args -> addFun("add") {
val a = (args.list[0] as ObjInt).value val a = (args.list[0] as ObjInt).value
val b = (args.list[1] as ObjInt).value val b = (args.list[1] as ObjInt).value
ObjInt.of(a + b) ObjInt.of(a + b)
} }
addVal("status") { _, _ -> ObjString(classData as String) } addVal("status") { ObjString(classData as String) }
addVar( addVar(
"count", "count",
get = { _, instance -> get = {
val st = (instance as net.sergeych.lyng.obj.ObjInstance).data as CounterState val st = (thisObj as net.sergeych.lyng.obj.ObjInstance).data as CounterState
ObjInt.of(st.count) ObjInt.of(st.count)
}, },
set = { _, instance, value -> set = { value ->
val st = (instance as net.sergeych.lyng.obj.ObjInstance).data as CounterState val st = (thisObj as net.sergeych.lyng.obj.ObjInstance).data as CounterState
st.count = (value as ObjInt).value st.count = (value as ObjInt).value
} }
) )
addFun("secret") { _, _, _ -> ObjInt.of(42) } addFun("secret") { ObjInt.of(42) }
addFun("ping") { _, _, _ -> ObjInt.of(7) } addFun("ping") { ObjInt.of(7) }
} }
LyngClassBridge.bind(className = "Bar", module = "bridge.mod", importManager = im) { LyngClassBridge.bind(className = "Bar", module = "bridge.mod", importManager = im) {
initWithInstance { _, instance -> initWithInstance {
(instance as net.sergeych.lyng.obj.ObjInstance).data = CounterState(10) (thisObj as net.sergeych.lyng.obj.ObjInstance).data = CounterState(10)
} }
addVar( addVar(
"count", "count",
get = { _, instance -> get = {
val st = (instance as net.sergeych.lyng.obj.ObjInstance).data as CounterState val st = (thisObj as net.sergeych.lyng.obj.ObjInstance).data as CounterState
ObjInt.of(st.count) ObjInt.of(st.count)
}, },
set = { _, instance, value -> set = { value ->
val st = (instance as net.sergeych.lyng.obj.ObjInstance).data as CounterState val st = (thisObj as net.sergeych.lyng.obj.ObjInstance).data as CounterState
st.count = (value as ObjInt).value st.count = (value as ObjInt).value
} }
) )
@ -156,7 +156,7 @@ class BridgeBindingTest {
val bindFailed = try { val bindFailed = try {
LyngClassBridge.bind(className = "Late", module = "bridge.late", importManager = im) { LyngClassBridge.bind(className = "Late", module = "bridge.late", importManager = im) {
addVal("status") { _, _ -> ObjString("late") } addVal("status") { ObjString("late") }
} }
false false
} catch (_: ScriptError) { } catch (_: ScriptError) {
@ -183,20 +183,20 @@ class BridgeBindingTest {
init { _ -> init { _ ->
data = CounterState(5) data = CounterState(5)
} }
addFun("add") { _, _, args -> addFun("add") {
val a = (args.list[0] as ObjInt).value val a = (args.list[0] as ObjInt).value
val b = (args.list[1] as ObjInt).value val b = (args.list[1] as ObjInt).value
ObjInt.of(a + b) ObjInt.of(a + b)
} }
addVal("status") { _, _ -> ObjString(classData as String) } addVal("status") { ObjString(classData as String) }
addVar( addVar(
"count", "count",
get = { _, instance -> get = {
val st = (instance as net.sergeych.lyng.obj.ObjInstance).data as CounterState val st = (thisObj as net.sergeych.lyng.obj.ObjInstance).data as CounterState
ObjInt.of(st.count) ObjInt.of(st.count)
}, },
set = { _, instance, value -> set = { value ->
val st = (instance as net.sergeych.lyng.obj.ObjInstance).data as CounterState val st = (thisObj as net.sergeych.lyng.obj.ObjInstance).data as CounterState
st.count = (value as ObjInt).value st.count = (value as ObjInt).value
} }
) )

12
notes/bridge_facade_draft.kt
View File

@ -146,10 +146,22 @@ interface ClassBridgeBinder {
var classData: Any? var classData: Any?
fun init(block: suspend BridgeInstanceContext.(ScopeFacade) -> Unit) fun init(block: suspend BridgeInstanceContext.(ScopeFacade) -> Unit)
fun initWithInstance(block: suspend ScopeFacade.() -> Unit)
@Deprecated("Use receiver-form initWithInstance and read thisObj from ScopeFacade")
fun initWithInstance(block: suspend (ScopeFacade, Obj) -> Unit) fun initWithInstance(block: suspend (ScopeFacade, Obj) -> Unit)
fun addFun(name: String, impl: suspend ScopeFacade.() -> Obj)
@Deprecated("Use receiver-form addFun and read thisObj/args from ScopeFacade")
fun addFun(name: String, impl: suspend (ScopeFacade, Obj, Arguments) -> Obj) fun addFun(name: String, impl: suspend (ScopeFacade, Obj, Arguments) -> Obj)
fun addVal(name: String, impl: suspend ScopeFacade.() -> Obj)
@Deprecated("Use receiver-form addVal and read thisObj from ScopeFacade")
fun addVal(name: String, impl: suspend (ScopeFacade, Obj) -> Obj) fun addVal(name: String, impl: suspend (ScopeFacade, Obj) -> Obj)
fun addVar(
name: String,
get: suspend ScopeFacade.() -> Obj,
set: suspend ScopeFacade.(Obj) -> Unit
)
@Deprecated("Use receiver-form addVar and read thisObj from ScopeFacade")
fun addVar( fun addVar(
name: String, name: String,
get: suspend (ScopeFacade, Obj) -> Obj, get: suspend (ScopeFacade, Obj) -> Obj,

18
notes/kotlin_bridge_binding.md
View File

@ -39,34 +39,34 @@ LyngClassBridge.bind(className = "Foo", module = "bridge.mod", importManager = i
data = CounterState(0) data = CounterState(0)
} }
addFun("add") { _, _, args -> addFun("add") {
val a = (args.list[0] as ObjInt).value val a = (args.list[0] as ObjInt).value
val b = (args.list[1] as ObjInt).value val b = (args.list[1] as ObjInt).value
ObjInt.of(a + b) ObjInt.of(a + b)
} }
addVal("status") { _, _ -> ObjString(classData as String) } addVal("status") { ObjString(classData as String) }
addVar( addVar(
"count", "count",
get = { _, instance -> get = {
val st = (instance as ObjInstance).data as CounterState val st = (thisObj as ObjInstance).data as CounterState
ObjInt.of(st.count) ObjInt.of(st.count)
}, },
set = { _, instance, value -> set = { value ->
val st = (instance as ObjInstance).data as CounterState val st = (thisObj as ObjInstance).data as CounterState
st.count = (value as ObjInt).value st.count = (value as ObjInt).value
} }
) )
addFun("secret") { _, _, _ -> ObjInt.of(42) } addFun("secret") { ObjInt.of(42) }
addFun("ping") { _, _, _ -> ObjInt.of(7) } addFun("ping") { ObjInt.of(7) }
} }
``` ```
## Notes ## Notes
- Visibility is respected by usual Lyng access rules; private extern members can be used only within class code. - Visibility is respected by usual Lyng access rules; private extern members can be used only within class code.
- Use `init { scope -> ... }` for receiver-style init, or `initWithInstance { scope, instance -> ... }` for explicit instance access. - Use `init { ... }` / `initWithInstance { ... }` with `ScopeFacade` receiver; access instance via `thisObj`.
- `classData` and `instance.data` are Kotlin-only payloads and do not appear in Lyng reflection. - `classData` and `instance.data` are Kotlin-only payloads and do not appear in Lyng reflection.
- Binding after the first instance of a class is created throws a `ScriptError`. - Binding after the first instance of a class is created throws a `ScriptError`.