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JSFunction.swift
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96 lines (85 loc) · 3.35 KB
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import _CJavaScriptKit
@dynamicCallable
public class JSFunctionRef: JSObjectRef {
@discardableResult
public func dynamicallyCall(withArguments arguments: [JSValueConvertible]) -> JSValue {
let result = arguments.withRawJSValues { rawValues in
rawValues.withUnsafeBufferPointer { bufferPointer -> RawJSValue in
let argv = bufferPointer.baseAddress
let argc = bufferPointer.count
var result = RawJSValue()
_call_function(
self.id, argv, Int32(argc),
&result.kind, &result.payload1, &result.payload2
)
return result
}
}
return result.jsValue()
}
public func apply(this: JSObjectRef, arguments: JSValueConvertible...) -> JSValue {
apply(this: this, argumentList: arguments)
}
public func apply(this: JSObjectRef, argumentList: [JSValueConvertible]) -> JSValue {
let result = argumentList.withRawJSValues { rawValues in
rawValues.withUnsafeBufferPointer { bufferPointer -> RawJSValue in
let argv = bufferPointer.baseAddress
let argc = bufferPointer.count
var result = RawJSValue()
_call_function_with_this(this.id,
self.id, argv, Int32(argc),
&result.kind, &result.payload1, &result.payload2
)
return result
}
}
return result.jsValue()
}
public func new(_ arguments: JSValueConvertible...) -> JSObjectRef {
return arguments.withRawJSValues { rawValues in
rawValues.withUnsafeBufferPointer { bufferPointer in
let argv = bufferPointer.baseAddress
let argc = bufferPointer.count
var resultObj = JavaScriptPayload()
_call_new(
self.id, argv, Int32(argc),
&resultObj
)
return JSObjectRef(id: resultObj)
}
}
}
static var sharedFunctions: [([JSValue]) -> JSValue] = []
public static func from(_ body: @escaping ([JSValue]) -> JSValue) -> JSFunctionRef {
let id = JavaScriptHostFuncRef(sharedFunctions.count)
sharedFunctions.append(body)
var funcRef: JavaScriptObjectRef = 0
_create_function(id, &funcRef)
return JSFunctionRef(id: funcRef)
}
public override func jsValue() -> JSValue {
.function(self)
}
}
@_cdecl("swjs_prepare_host_function_call")
public func _prepare_host_function_call(_ argc: Int32) -> UnsafeMutableRawPointer {
let argumentSize = MemoryLayout<RawJSValue>.size * Int(argc)
return malloc(Int(argumentSize))!
}
@_cdecl("swjs_cleanup_host_function_call")
public func _cleanup_host_function_call(_ pointer: UnsafeMutableRawPointer) {
free(pointer)
}
@_cdecl("swjs_call_host_function")
public func _call_host_function(
_ hostFuncRef: JavaScriptHostFuncRef,
_ argv: UnsafePointer<RawJSValue>, _ argc: Int32,
_ callbackFuncRef: JavaScriptPayload) {
let hostFunc = JSFunctionRef.sharedFunctions[Int(hostFuncRef)]
let args = UnsafeBufferPointer(start: argv, count: Int(argc)).map {
$0.jsValue()
}
let result = hostFunc(args)
let callbackFuncRef = JSFunctionRef(id: callbackFuncRef)
_ = callbackFuncRef(result)
}