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JSONReader.swift
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158 lines (135 loc) · 4.35 KB
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import Foundation
public class JSONReader : Reader {
typealias RepeatedObject = (key: Int, generator: NSArray.Generator)
var generatorStack: [NSDictionary.Generator] = []
var generator: NSDictionary.Generator
var tagMapStack: [[String:(Int, Bool)]] = []
var tagMap: [String:(Int, Bool)]! = nil
var object: AnyObject! = nil
var repeatedObjectStack: [RepeatedObject?] = []
var repeatedObject: RepeatedObject? = nil
init(dictionary: NSDictionary) {
self.generator = dictionary.generate()
}
public class func from(data: NSData) -> Reader? {
var readData : AnyObject?
do {
readData = try NSJSONSerialization.JSONObjectWithData(data, options: [])
} catch {
print(error)
}
if let dict = readData as? NSDictionary {
return JSONReader(dictionary: dict)
} else {
return nil
}
}
public class func from(inputStream: NSInputStream) -> Reader? {
let dict: NSDictionary = (try! NSJSONSerialization.JSONObjectWithStream(inputStream, options: [])) as! NSDictionary
return JSONReader(dictionary: dict)
}
public func readTag() -> Int {
if let value: AnyObject = repeatedObject?.generator.next() {
object = value
return repeatedObject!.key
}
if let
keyValuePair = generator.next(),
info = tagMap[keyValuePair.key as! String] {
if info.1 {
repeatedObject = (key: info.0, generator: (keyValuePair.value as! NSArray).generate())
object = repeatedObject?.generator.next()
} else {
object = keyValuePair.value
}
if nil == object || object is NSNull {
return readTag()
} else {
return info.0
}
} else {
return 0
}
}
public func readVarInt() -> Int {
if let v = (object as? NSNumber)?.integerValue {
return v
}
return 0
}
public func readVarUInt() -> UInt {
if let v = (object as? NSNumber)?.unsignedIntegerValue {
return UInt(v)
}
return 0
}
public func readVarUInt64() -> UInt64 {
if let v = (object as? NSNumber)?.unsignedLongLongValue {
return UInt64(v)
}
return 0
}
public func readBool() -> Bool {
if let v = (object as? NSNumber)?.boolValue {
return v
}
return false
}
public func readData() -> NSData {
NSException(name:"Unsupported Operation", reason:"", userInfo: nil).raise()
return NSData()
}
public func readUInt32() -> UInt32 {
if let v = (object as? NSNumber)?.unsignedIntegerValue {
return UInt32(v)
}
return 0
}
public func readUInt64() -> UInt64 {
if let v = (object as? NSNumber)?.unsignedIntegerValue {
return UInt64(v)
}
return 0
}
public func readFloat32() -> Float32 {
if let v = (object as? NSNumber)?.floatValue {
return Float32(v)
}
return 0
}
public func readFloat64() -> Float64 {
if let v = (object as? NSNumber)?.doubleValue {
return Float64(v)
}
return 0
}
public func readString() -> String {
if let value = object as? String {
return value
}
return ""
}
public func pushLimit(limit: Int) -> Int {
return 0 // NO OP
}
public func popLimit(limit: Int) {
// NO OP
}
public func pushTagMap(map: [String:(Int, Bool)]) {
if nil != self.tagMap {
tagMapStack.append(self.tagMap)
generatorStack.append(generator)
generator = (object as! NSDictionary).generate()
repeatedObjectStack.append(repeatedObject)
repeatedObject = nil
}
self.tagMap = map
}
public func popTagMap() {
if tagMapStack.count > 0 {
tagMap = tagMapStack.removeLast()
generator = generatorStack.removeLast()
repeatedObject = repeatedObjectStack.removeLast()
}
}
}