55 lines
2.1 KiB
Swift
55 lines
2.1 KiB
Swift
//
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// NSAppleEventDescriptor+UserRecordFields.swift
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// NetNewsWireTests
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//
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// Created by Olof Hellman on 1/7/18.
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// Copyright © 2018 Olof Hellman. All rights reserved.
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//
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import Foundation
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/*
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@function usrfDictionary()
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@brief When an apple event record contains key-value pairs for which the keys are
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not associated with FourCharCode keys, the keys and values appear in a
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"user record fields" AEList, in which the odd items are the keys and the
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even items are the values. This function unpacks user record fields and
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returns an analogous Swift dictionary
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*/
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extension NSAppleEventDescriptor {
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public func usrfDictionary() -> [String:NSAppleEventDescriptor] {
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guard self.isRecordDescriptor else {
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print ("error: usrfDictionary() expected input to be a record")
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return [:]
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}
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guard let usrfList = self.forKeyword("usrf".FourCharCode()) else {
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print ("error: usrfDictionary() couldn't find usrf")
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return [:]
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}
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let listCount = usrfList.numberOfItems
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guard (listCount%2 == 0) else {
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print ("error: usrfDictionary() expected even number of items in usrf")
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return [:]
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}
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var usrfDictionary:[String:NSAppleEventDescriptor] = [:]
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var processedItems = 0
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while (processedItems < listCount) {
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processedItems = processedItems + 2
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guard let nthlabel = usrfList.atIndex(processedItems-1) else {
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print("usrfDictionary() couldn't get item \(processedItems+1) in usrf list")
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continue
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}
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guard let nthvalue = usrfList.atIndex(processedItems) else {
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print("usrfDictionary() couldn't get item \(processedItems+2) in usrf list")
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continue
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}
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guard let nthLabelString = nthlabel.stringValue else {
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print("usrfDictionary() expected label to be a String")
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continue
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}
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usrfDictionary[nthLabelString] = nthvalue
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}
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return usrfDictionary;
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}
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}
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