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XWVMetaObject.swift
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255 lines (237 loc) · 8.97 KB
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/*
Copyright 2015 XWebView
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
import Foundation
import ObjectiveC
class XWVMetaObject: CollectionType {
enum Member {
case Method(selector: Selector, arity: Int32)
case Property(getter: Selector, setter: Selector)
case Initializer(selector: Selector, arity: Int32)
var isMethod: Bool {
if case .Method = self { return true }
return false
}
var isProperty: Bool {
if case .Property = self { return true }
return false
}
var isInitializer: Bool {
if case .Initializer = self { return true }
return false
}
var selector: Selector? {
switch self {
case let .Method(selector, _):
assert(selector != Selector())
return selector
case let .Initializer(selector, _):
assert(selector != Selector())
return selector
default:
return nil
}
}
var getter: Selector? {
if case .Property(let getter, _) = self {
assert(getter != Selector())
return getter
}
return nil
}
var setter: Selector? {
if case .Property(let getter, let setter) = self {
assert(getter != Selector())
return setter
}
return nil
}
var type: String {
let promise: Bool
let arity: Int32
switch self {
case let .Method(selector, a):
promise = selector.description.hasSuffix(":promiseObject:") ||
selector.description.hasSuffix("PromiseObject:")
arity = a
case let .Initializer(_, a):
promise = true
arity = a < 0 ? a: a + 1
default:
promise = false
arity = -1
}
if !promise && arity < 0 {
return ""
}
return "#" + (arity >= 0 ? "\(arity)" : "") + (promise ? "p" : "a")
}
}
let plugin: AnyClass
private var members = [String: Member]()
private static let exclusion: Set<Selector> = {
var methods = instanceMethods(forProtocol: XWVScripting.self)
methods.remove(Selector("invokeDefaultMethodWithArguments:"))
return methods.union([
Selector(".cxx_construct"),
Selector(".cxx_destruct"),
Selector("dealloc"),
Selector("copy")
])
}()
init(plugin: AnyClass) {
self.plugin = plugin
enumerateExcluding(self.dynamicType.exclusion) {
(var name, var member) -> Bool in
switch member {
case let .Method(selector, _):
if let end = name.characters.indexOf(":") {
name = name[name.startIndex ..< end]
}
if let cls = plugin as? XWVScripting.Type {
if cls.isSelectorExcludedFromScript?(selector) ?? false {
return true
}
if selector == Selector("invokeDefaultMethodWithArguments:") {
member = .Method(selector: selector, arity: -1)
name = ""
} else {
name = cls.scriptNameForSelector?(selector) ?? name
}
} else if name.characters.first == "_" {
return true
}
case .Property(_, _):
if let cls = plugin as? XWVScripting.Type {
if let isExcluded = cls.isKeyExcludedFromScript where name.withCString(isExcluded) {
return true
}
if let scriptNameForKey = cls.scriptNameForKey {
name = name.withCString(scriptNameForKey) ?? name
}
} else if name.characters.first == "_" {
return true
}
case let .Initializer(selector, _):
if selector == Selector("initByScriptWithArguments:") {
member = .Initializer(selector: selector, arity: -1)
name = ""
} else if let cls = plugin as? XWVScripting.Type {
name = cls.scriptNameForSelector?(selector) ?? name
}
if !name.isEmpty {
return true
}
}
assert(members.indexForKey(name) == nil, "Script name '\(name)' has conflict")
members[name] = member
return true
}
}
private func enumerateExcluding(selectors: Set<Selector>, @noescape callback: ((String, Member)->Bool)) -> Bool {
var known = selectors
// enumerate properties
let properties = class_copyPropertyList(plugin, nil)
if properties != nil {
for var prop = properties; prop.memory != nil; prop = prop.successor() {
let name = String(UTF8String: property_getName(prop.memory))!
// get getter
var attr = property_copyAttributeValue(prop.memory, "G")
let getter = Selector(attr == nil ? name : String(UTF8String: attr)!)
free(attr)
if known.contains(getter) {
continue
}
known.insert(getter)
// get setter if readwrite
var setter = Selector()
attr = property_copyAttributeValue(prop.memory, "R")
if attr == nil {
attr = property_copyAttributeValue(prop.memory, "S")
if attr == nil {
setter = Selector("set\(String(name.characters.first!).uppercaseString)\(String(name.characters.dropFirst())):")
} else {
setter = Selector(String(UTF8String: attr)!)
}
if known.contains(setter) {
setter = Selector()
} else {
known.insert(setter)
}
}
free(attr)
let info = Member.Property(getter: getter, setter: setter)
if !callback(name, info) {
free(properties)
return false
}
}
free(properties)
}
// enumerate methods
let methods = class_copyMethodList(plugin, nil)
if methods != nil {
for var method = methods; method.memory != nil; method = method.successor() {
let sel = method_getName(method.memory)
if !known.contains(sel) {
let arity = Int32(method_getNumberOfArguments(method.memory) - 2)
let member: Member
if sel.description.hasPrefix("init") {
member = Member.Initializer(selector: sel, arity: arity)
} else {
member = Member.Method(selector: sel, arity: arity)
}
if !callback(sel.description, member) {
free(methods)
return false
}
}
}
free(methods)
}
return true
}
}
extension XWVMetaObject {
// SequenceType
typealias Generator = DictionaryGenerator<String, Member>
func generate() -> Generator {
return members.generate()
}
// CollectionType
typealias Index = DictionaryIndex<String, Member>
var startIndex: Index {
return members.startIndex
}
var endIndex: Index {
return members.endIndex
}
subscript (position: Index) -> (String, Member) {
return members[position]
}
subscript (name: String) -> Member? {
return members[name]
}
}
private func instanceMethods(forProtocol aProtocol: Protocol) -> Set<Selector> {
var selectors = Set<Selector>()
for (req, inst) in [(true, true), (false, true)] {
let methodList = protocol_copyMethodDescriptionList(aProtocol.self, req, inst, nil)
if methodList != nil {
for var desc = methodList; desc.memory.name != nil; desc = desc.successor() {
selectors.insert(desc.memory.name)
}
free(methodList)
}
}
return selectors
}