Hi all,
I ran into some strangeness with NSAttributedString -RTFFromRange when
using text table attributes. I'm actually implementing a custom
NSTextStorage and ran into this when copying to the clipboard, but
have been able to boil this down to a simple example using
NSMutableAttributedString.
Basically the implementation of RTFFromRange gets confused in some
cases and can call attributesAtIndex with an out-of-bounds index. It
could be that I am the one confusing it, because I have somehow
mangled the attributes, so I'd welcome any advice.
What follows is an example that sets up some table attributes
programmatically on the string - in the first case making a the table
span the entire string, and in the second case making it span all but
the last character. In the second case, calling RTFFromRange on the
string causes an exception.
- (void) testTableBug {
NSMutableAttributedString* test = [[NSMutableAttributedString alloc]
initWithString:@"Testa"];
// create some 'default' attributes
NSMutableDictionary* baseAttrs = [NSMutableDictionary dictionary];
NSParagraphStyle* baseParaStyle = [NSParagraphStyle
defaultParagraphStyle];
[baseAttrs setObject:baseParaStyle
forKey:NSParagraphStyleAttributeName];
// create some attributes with a 1-cell table
NSMutableDictionary* tableAttrs = [NSMutableDictionary dictionary];
NSTextTable* table = [[NSTextTable alloc] init];
[table setNumberOfColumns:1];
NSTextTableBlock* block = [[NSTextTableBlock alloc]
initWithTable:table
startingRow:0
rowSpan:1
startingColumn:0
columnSpan:1];
NSMutableParagraphStyle* paraStyle = [[NSMutableParagraphStyle alloc]
init];
[paraStyle setParagraphStyle:baseParaStyle];
[paraStyle setTextBlocks:[NSArray arrayWithObjects:block,nil]];
[tableAttrs setObject:paraStyle forKey:NSParagraphStyleAttributeName];
// test 1: make the table style span the whole string, the convert to
RTF (will work OK)
NSRange everything = NSMakeRange(0, [test length]);
[test setAttributes:tableAttrs range:everything];
NSData* data = [test RTFFromRange:everything documentAttributes:
[NSDictionary dictionary]];
// test 2: make the table span all but the last character, then
convert again (will break)
NSRange tableRange = NSMakeRange(0, [test length] - 1);
NSRange baseRange = NSMakeRange(NSMaxRange(tableRange), 1);
[test setAttributes:tableAttrs range:tableRange];
[test setAttributes:baseAttrs range:baseRange];
data = [test RTFFromRange:everything documentAttributes:[NSDictionary
dictionary]];
}
BTW, this is on 10.5.4 (Intel) and my app is GC-only.
Cheers
..Mark..
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