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Add JavaScriptCore and test project.
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‎JSCTest.xcodeproj/project.pbxproj

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‎JSCTest/AppDelegate.h

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//
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// AppDelegate.h
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// JSCTest
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//
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// Created by Nigel Brooke on 2013-05-13.
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// Copyright (c) 2013 Nigel Brooke. All rights reserved.
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//
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#import <Cocoa/Cocoa.h>
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@interface AppDelegate : NSObject <NSApplicationDelegate>
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@property (assign) IBOutlet NSWindow *window;
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@end

‎JSCTest/AppDelegate.m

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//
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// AppDelegate.m
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// JSCTest
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//
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// Created by Nigel Brooke on 2013-05-13.
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//
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#import "AppDelegate.h"
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#import "JavaScriptCore/API/JSContext.h"
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#import "JavaScriptCore/API/JSExport.h"
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#import "objc/runtime.h"
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//---------------------------------------------------------------------------
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// Protocol to list functions to be exported from a existing class
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@protocol NSButtonExport <JSExport>
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-(void)setTitle:(NSString*)title;
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-(NSString*)title;
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@end
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//---------------------------------------------------------------------------
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// Wrapper class to forward no-arg or one-arg (argument is stripped though)
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// selector calls through to a JS object. So that we can call JS directly from
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// ObjC rather than going through -[JSValue invokeMethod]
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@interface Forwarder : NSObject
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@property JSValue* value;
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@end
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@implementation Forwarder
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-(id)initWithValue:(JSValue*)value {
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if((self = [super init])) {
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self.value = value;
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}
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return self;
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}
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- (NSMethodSignature *)methodSignatureForSelector:(SEL)aSelector {
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NSString* functionName = [NSStringFromSelector(aSelector) stringByReplacingOccurrencesOfString:@":" withString:@""];
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if ([self.value valueForProperty:functionName] ) {
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NSMethodSignature* signature = [NSMethodSignature signatureWithObjCTypes:"@:@"];
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return signature;
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}
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return nil;
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}
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- (void)forwardInvocation:(NSInvocation *)forwardedInvocation
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{
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NSString* functionName = [NSStringFromSelector([forwardedInvocation selector]) stringByReplacingOccurrencesOfString:@":" withString:@""];
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[self.value invokeMethod:functionName withArguments:@[]];
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}
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@end
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//---------------------------------------------------------------------------
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// To call selectors using forwarding, need the selector to be declared somewhere
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// This isn't used, just serves to define this selector
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@protocol Dummy
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-(void)logInfo;
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@end
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//---------------------------------------------------------------------------
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// Our native test object
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// Protocol to list bindings
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@protocol NativeObjectExport <JSExport>
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-(void)test;
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-(void)log:(NSString*)string;
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@end
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// The native test object itself
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@interface NativeObject : NSObject <NativeObjectExport>
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@end
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@implementation NativeObject
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-(void)test {
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NSLog(@"native: test was called");
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}
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-(void)log:(NSString*)string {
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NSLog(@"js: %@", string);
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}
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@end
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@interface AppDelegate ()
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@property JSContext* context; // Our local javascript context
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@end
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// Need something persistant to store this, since setting it as a target doesn't retain it
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id forwarder;
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@implementation AppDelegate
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- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
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{
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// Could possibly build a protocol dynamically like this, doesn't work for me though, my objc-runtime-fu is not strong enough
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/*
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Protocol* newProtocol = objc_allocateProtocol("RuntimeProtocol");
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Protocol* exportProtocol = objc_getProtocol("JSExport");
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protocol_addProtocol(newProtocol, exportProtocol);
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protocol_addMethodDescription(newProtocol, @selector(setTitle:), "v@:@", YES, YES);
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protocol_addMethodDescription(newProtocol, @selector(title), "@@:", YES, YES);
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objc_registerProtocol(newProtocol);
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*/
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// Attach out export protocol to NSButton
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Protocol* newProtocol = @protocol(NSButtonExport);
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class_addProtocol([NSButton class], newProtocol);
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// Load the script
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NSString* script = [[NSString alloc] initWithData:[NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"javascript" ofType:@"js"]] encoding:NSUTF8StringEncoding];
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// Create the button
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NSButton* button = [[NSButton alloc] initWithFrame:NSRectFromCGRect(CGRectMake(0, 0, 200, 50))];
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button.title = @"Hello Objective-C";
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[self.window.contentView addSubview:button];
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// Create the JS context
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self.context = [[JSContext alloc] init];
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// Bind out two test objects into global variables in the JS context
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self.context[@"nativeObject"] = [[NativeObject alloc] init];
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self.context[@"button"] = button;
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// Run the script
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[self.context evaluateScript:script];
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// Now pull out some test values, and run some functions
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JSValue* scriptObject = self.context[@"scriptObject"];
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// Run a method manually
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JSValue* result = [scriptObject invokeMethod:@"logInfo" withArguments:@[]];
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NSLog(@"native: logInfo result - \"%@\"", result);
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// Peek and poke at some variables
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NSLog(@"native: scriptObject data is \"%@\"", [scriptObject valueForProperty:@"data"]);
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NSLog(@"native: global variable value is \"%@\"", self.context[@"globalVariable"]);
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[scriptObject setValue:@"From Objective-C" forProperty:@"data"];
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// create our method forwarder
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forwarder = [[Forwarder alloc] initWithValue:scriptObject];
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// Call a JS function via forwarding
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[forwarder logInfo];
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// Set the JS object as the action target for the button
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[button setTarget:forwarder];
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[button setAction:@selector(buttonPressed:)];
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}
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@end

‎JSCTest/JSCTest-Info.plist

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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
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<plist version="1.0">
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<dict>
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<key>CFBundleDevelopmentRegion</key>
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<string>en</string>
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<key>CFBundleExecutable</key>
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<string>${EXECUTABLE_NAME}</string>
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<key>CFBundleIconFile</key>
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<string></string>
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<key>CFBundleIdentifier</key>
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<string>com.steamclock.${PRODUCT_NAME:rfc1034identifier}</string>
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<key>CFBundleInfoDictionaryVersion</key>
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<string>6.0</string>
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<key>CFBundleName</key>
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<string>${PRODUCT_NAME}</string>
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<key>CFBundlePackageType</key>
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<string>APPL</string>
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<key>CFBundleShortVersionString</key>
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<string>1.0</string>
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<key>CFBundleSignature</key>
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<string>????</string>
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<key>CFBundleVersion</key>
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<string>1</string>
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<key>LSMinimumSystemVersion</key>
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<string>${MACOSX_DEPLOYMENT_TARGET}</string>
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<key>NSHumanReadableCopyright</key>
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<string>Copyright © 2013 Nigel Brooke. All rights reserved.</string>
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<key>NSMainNibFile</key>
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<string>MainMenu</string>
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<key>NSPrincipalClass</key>
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<string>NSApplication</string>
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</dict>
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</plist>

‎JSCTest/JSCTest-Prefix.pch

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//
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// Prefix header for all source files of the 'JSCTest' target in the 'JSCTest' project
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//
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#ifdef __OBJC__
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#import <Cocoa/Cocoa.h>
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#endif

‎JSCTest/en.lproj/Credits.rtf

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{\rtf0\ansi{\fonttbl\f0\fswiss Helvetica;}
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{\colortbl;\red255\green255\blue255;}
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\paperw9840\paperh8400
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\pard\tx560\tx1120\tx1680\tx2240\tx2800\tx3360\tx3920\tx4480\tx5040\tx5600\tx6160\tx6720\ql\qnatural
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\f0\b\fs24 \cf0 Engineering:
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\b0 \
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Some people\
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\
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\b Human Interface Design:
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\b0 \
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Some other people\
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\
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\b Testing:
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\b0 \
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Hopefully not nobody\
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\
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\b Documentation:
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\b0 \
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Whoever\
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\
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\b With special thanks to:
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\b0 \
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Mom\
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}

‎JSCTest/en.lproj/InfoPlist.strings

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/* Localized versions of Info.plist keys */
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