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+//
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+// ViewController.m
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+// TestApp
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+//
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+// Created by 邢铖 on 2023/6/1.
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+//
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+
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+#import "RootViewController.h"
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+#import <XCTreeLang/XCTreeLang.h>
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+
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+char *kRootViewControllerKVOKey = "kRootViewControllerKVOKey";
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+
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+@interface RootViewController () <UITextViewDelegate, XCTLStreamDelegate>
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+
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+@property (nonatomic, strong) UITextView *sourceTextView;
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+@property (nonatomic, strong) UITextView *terminalTextView;
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+@property (nonatomic, strong) UIButton *runButton;
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+@property (nonatomic, strong) UIView *previewViewControllerContext;
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+@property (nonatomic, strong) UIViewController *previewViewController;
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+@property (nonatomic, copy) NSArray<NSLayoutConstraint *> *previewConstraints;
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+
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+@property (nonatomic, strong) UIView *testView;
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+
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+@end
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+
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+@implementation RootViewController
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+
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+- (UIView *)testView {
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+ if (!_testView) {
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+ _testView = [[UIButton alloc] initWithFrame:CGRectMake(100, 100, 100, 100)];
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+ }
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+ return _testView;
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+}
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+
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+- (void)viewDidLoad {
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+ [self.view addSubview:self.sourceTextView];
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+ [self.view addSubview:self.terminalTextView];
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+ [self.view addSubview:self.runButton];
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+ [self.view addSubview:self.previewViewControllerContext];
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+
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+ [self.previewViewControllerContext.rightAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.rightAnchor].active = true;
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+ [self.previewViewControllerContext.topAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.topAnchor].active = true;
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+ [self.previewViewControllerContext.bottomAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.bottomAnchor].active = true;
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+ [self.previewViewControllerContext.widthAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.widthAnchor multiplier:0.3].active = true;
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+
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+ [self.sourceTextView.leftAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.leftAnchor].active = true;
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+ [self.sourceTextView.topAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.topAnchor].active = true;
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+ [self.sourceTextView.rightAnchor constraintEqualToAnchor:self.previewViewControllerContext.leftAnchor].active = true;
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+ [self.sourceTextView.heightAnchor constraintEqualToAnchor:self.terminalTextView.heightAnchor multiplier:2].active = true;
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+
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+ [self.terminalTextView.topAnchor constraintEqualToAnchor:self.sourceTextView.bottomAnchor].active = true;
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+ [self.terminalTextView.leftAnchor constraintEqualToAnchor:self.sourceTextView.leftAnchor].active = true;
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+ [self.terminalTextView.rightAnchor constraintEqualToAnchor:self.sourceTextView.rightAnchor].active = true;
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+ [self.terminalTextView.bottomAnchor constraintEqualToAnchor:self.view.safeAreaLayoutGuide.bottomAnchor].active = true;
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+
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+ [self.runButton.rightAnchor constraintEqualToAnchor:self.sourceTextView.rightAnchor constant:-10].active = true;
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+ [self.runButton.bottomAnchor constraintEqualToAnchor:self.sourceTextView.bottomAnchor constant:-10].active = true;
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+ [self.runButton.widthAnchor constraintEqualToConstant:108].active = true;
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+ [self.runButton.heightAnchor constraintEqualToConstant:38].active = true;
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+
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+ [self addObserver:self
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+ forKeyPath:@"previewViewController"
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+ options:NSKeyValueObservingOptionOld
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+ context:kRootViewControllerKVOKey];
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+
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+ [self addObserver:self
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+ forKeyPath:@"previewViewController"
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+ options:NSKeyValueObservingOptionNew
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+ context:kRootViewControllerKVOKey];
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+
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+ [super viewDidLoad];
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+}
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+
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+- (UITextView *)makeTextView {
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+ UITextView *textView = [UITextView new];
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+ textView.translatesAutoresizingMaskIntoConstraints = false;
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+ textView.font = [UIFont fontWithName:@"Menlo" size:16];
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+ textView.backgroundColor = UIColor.systemBackgroundColor;
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+ textView.allowsEditingTextAttributes = false;
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+ textView.contentMode = UIViewContentModeRedraw;
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+ textView.autocorrectionType = UITextAutocorrectionTypeNo;
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+ textView.smartQuotesType = UITextSmartQuotesTypeNo;
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+ textView.smartDashesType = UITextSmartDashesTypeNo;
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+ textView.smartInsertDeleteType = UITextSmartInsertDeleteTypeNo;
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+ textView.autocapitalizationType = UITextAutocapitalizationTypeNone;
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+ textView.spellCheckingType = UITextSpellCheckingTypeNo;
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+ textView.textContentType = nil;
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+ textView.tintColor = UIColor.systemOrangeColor;
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+ textView.editable = true;
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+ return textView;
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+}
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+
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+- (UITextView *)sourceTextView {
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+ if (!_sourceTextView) {
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+ _sourceTextView = [self makeTextView];
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+ _sourceTextView.backgroundColor = UIColor.systemBackgroundColor;
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+ NSString *savedCode = [NSUserDefaults.standardUserDefaults stringForKey:@"code"];
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+ if (savedCode == nil || savedCode.length == 0) {
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+ savedCode = [NSString stringWithContentsOfFile:[NSBundle.mainBundle pathForResource:@"InitialContent" ofType:@"xct"]
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+ encoding:NSUTF8StringEncoding
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+ error:nil];
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+ }
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+ _sourceTextView.text = savedCode;
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+ _sourceTextView.delegate = self;
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+ }
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+ return _sourceTextView;
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+}
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+
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+- (UITextView *)terminalTextView {
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+ if (!_terminalTextView) {
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+ _terminalTextView = [self makeTextView];
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+ _terminalTextView.backgroundColor = UIColor.tertiarySystemBackgroundColor;
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+ _terminalTextView.editable = false;
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+ }
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+ return _terminalTextView;
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+}
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+
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+- (UIButton *)runButton {
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+ if (!_runButton) {
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+ _runButton = [UIButton new];
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+ _runButton.translatesAutoresizingMaskIntoConstraints = false;
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+ _runButton.layer.cornerRadius = 10;
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+ _runButton.backgroundColor = UIColor.systemFillColor;
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+ [_runButton setTitleColor:UIColor.systemOrangeColor forState:UIControlStateNormal];
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+ [_runButton setTitle:@"Run Code" forState:UIControlStateNormal];
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+ [_runButton addTarget:self
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+ action:@selector(runButtonDidTouchUp)
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+ forControlEvents:UIControlEventTouchUpInside];
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+ }
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+ return _runButton;
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+}
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+
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+- (UIView *)previewViewControllerContext {
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+ if (!_previewViewControllerContext) {
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+ _previewViewControllerContext = [UIView new];
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+ _previewViewControllerContext.translatesAutoresizingMaskIntoConstraints = false;
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+ _previewViewControllerContext.backgroundColor = UIColor.secondarySystemBackgroundColor;
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+ }
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+ return _previewViewControllerContext;
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+}
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+
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+- (void)runButtonDidTouchUp {
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+ [self clearPreviewWithViewController:self.previewViewController];
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+ _previewViewController = nil;
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+
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+ self.terminalTextView.text = @"";
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+ XCTLAST *program = [XCTLEngine.shared compileWithCode:self.sourceTextView.text];
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+ if (program == NULL) {
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+ self.terminalTextView.text = [self.terminalTextView.text stringByAppendingString:@"Compile failed, see program log for more details."];
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+ return;
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+ }
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+ program.stdoutDelegate = self;
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+ NSError *error;
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+ [XCTLEngine.shared evaluateWithAst:program
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+ sourceObject:self
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+ error:&error];
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+ if (error) {
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+ self.terminalTextView.text = [self.terminalTextView.text stringByAppendingString:error.localizedDescription];
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+ self.terminalTextView.text = [self.terminalTextView.text stringByAppendingFormat:@"\n%@", error.description];
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+ }
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+}
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+
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+- (void)updatePreview {
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+ if (self.previewViewController) {
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+ [self addChildViewController:self.previewViewController];
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+ [self.previewViewControllerContext addSubview:self.previewViewController.view];
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+ self.previewViewController.view.translatesAutoresizingMaskIntoConstraints = false;
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+ self.previewConstraints = @[
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+ [self.previewViewController.view.leftAnchor constraintEqualToAnchor:self.previewViewControllerContext.leftAnchor],
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+ [self.previewViewController.view.topAnchor constraintEqualToAnchor:self.previewViewControllerContext.topAnchor],
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+ [self.previewViewController.view.rightAnchor constraintEqualToAnchor:self.previewViewControllerContext.rightAnchor],
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+ [self.previewViewController.view.bottomAnchor constraintEqualToAnchor:self.previewViewControllerContext.bottomAnchor]
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+ ];
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+ for (NSLayoutConstraint *constraint in self.previewConstraints) {
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+ constraint.active = true;
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+ }
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+ }
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+}
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+
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+- (void)clearPreviewWithViewController:(UIViewController *)viewController {
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+ if (self.previewConstraints) {
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+ [self.previewViewControllerContext removeConstraints:self.previewConstraints];
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+ self.previewConstraints = nil;
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+ }
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+ if (viewController) {
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+ [viewController.view removeFromSuperview];
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+ [viewController removeFromParentViewController];
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+ }
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+}
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+
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+- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {
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+ if (context == kRootViewControllerKVOKey) {
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+ if ([@"previewViewController" isEqualToString:keyPath]) {
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+ UIViewController *oldValue = change[NSKeyValueChangeOldKey];
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+ if (oldValue) {
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+ if ([oldValue isKindOfClass:UIViewController.class]) {
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+ [self clearPreviewWithViewController:oldValue];
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+ }
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+ } else {
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+ [self updatePreview];
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+ }
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+ }
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+ } else {
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+ [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];
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+ }
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+}
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+
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+- (void)stream:(XCTLStream *)stream appendText:(NSString *)text {
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+ self.terminalTextView.text = [self.terminalTextView.text stringByAppendingString:text];
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+}
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+
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+- (void)textViewDidChange:(UITextView *)textView {
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+ [NSUserDefaults.standardUserDefaults setValue:textView.text forKey:@"code"];
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+}
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+
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+- (void)dealloc {
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+ [self removeObserver:self
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+ forKeyPath:@"previewViewController"
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+ context:kRootViewControllerKVOKey];
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+}
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+
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+@end
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