Question

我正在尝试使用NSLinguisticTagger来监控NSTextStorage的内容，并根据用户输入的内容提供一些上下文信息。为此，我有一个OverlayManager对象，它将这种关系连接起来：

-(void) setView:(NSTextView*) view {
    _view = view;
    _layout = view.layoutManager;
    _storage = view.layoutManager.textStorage; //get the TextStorage from the view
    [_tagger setString:_storage.string]; //pull the string out, this grabs the mutable version
    [self registerForNotificationsOn:self->_storage]; //subscribe to the willProcessEditing notification
}

当编辑发生时，我确保将其捕获并通知标记器（是的，我知道我与成员访问权限令人讨厌，我在Obj-C上生锈了，我稍后会修复它）：

- (void) textStorageWillProcessEditing:(NSNotification*) notification{
    if ([self->_storage editedMask] & NSTextStorageEditedCharacters) {
        NSRange editedRange = [self->_storage editedRange];
        NSUInteger delta = [self->_storage changeInLength];
        [_tagger stringEditedInRange:editedRange changeInLength:delta]; //should notify the tagger of the changes- if I replace this line with [_tagger setString:[_storage string]] it works, but gobbles CPU as it retags the entire string
        [self highlightEdits:self];
    }
}

highlightEdits消息将作业委托给“Overlay”对象池。每个代码都包含一个与此类似的代码块：

[tagger enumerateTagsInRange:range scheme:NSLinguisticTagSchemeLexicalClass options:0 usingBlock:^(NSString *tag, NSRange tokenRange, NSRange sentenceRange, BOOL *stop) {
            if (tag == PartOfSpeech) {
                [self applyHighlightToRange:tokenRange onStorage:storage];
            }
        }];

这就是问题所在 - enumerateTagsInRange方法崩溃了一条消息：

2014-06-04 10:07:19.692 WritersEditor[40191:303] NSMutableRLEArray     replaceObjectsInRange:withObject:length:: Out of bounds

如果我没有链接到底层字符串的可变副本而是执行[[_storage string] copy]，那么不会发生，但显然我不想复制每次我想做标记时，整个后备存储。这一切都应该在主运行循环中发生，所以我不认为这是一个线程问题。我正在枚举标签的NSRange存在于NSLinguisticTagger的字符串视图中的NSTextStorage 和中。这甚至不是applyHighlightToRange调用向字符串添加属性的事实，因为它甚至在到达该行之前崩溃。

我试图针对这个问题构建一个测试用例，但在这些情况下无法复制它：

- (void) testEdit { NSAttributedString* str = [[NSMutableAttributedString alloc] initWithString:@"Quickly, this is a test."]; text = [[NSTextStorage alloc] initWithAttributedString:str]; NSArray* schemes = [NSLinguisticTagger availableTagSchemesForLanguage:@"en"]; tagger = [[NSLinguisticTagger alloc] initWithTagSchemes:schemes options:0]; [tagger setString:[text string]]; [text beginEditing]; [[text mutableString] appendString:@"T"]; NSRange edited = [text editedRange]; NSUInteger length = [text changeInLength]; [text endEditing]; [tagger stringEditedInRange:edited changeInLength:length]; [tagger enumerateTagsInRange:edited scheme:NSLinguisticTagSchemeLexicalClass options:0 usingBlock:^(NSString *tag, NSRange tokenRange, NSRange sentenceRange, BOOL *stop) { //doesn't matter, this should crash }]; }

该代码不会崩溃。

NSLinguisticTagger关于NSTextStorage崩溃错误的内容

0 个答案: