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Fix for glyph index immediately beyond glyph range

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git-svn-id: svn+ssh://svn.gna.org/svn/gnustep/libs/gui/trunk@8812 72102866-910b-0410-8b05-ffd578937521
This commit is contained in:
Richard Frith-MacDonald 2001-01-26 17:01:43 +00:00
parent 35a0b834f8
commit 5f2d75b783
2 changed files with 49 additions and 43 deletions
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6
ChangeLog
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@ -1,3 +1,9 @@
2001-01-26 Richard Frith-Macdonald <rfm@gnu.org>
* Source/NSLayoutManager.m: when doing conversions between glyph
and character indices, support the index immediately beyond the
end of the glyphs/characters without raising an exception.
2001-01-22 Richard Frith-Macdonald <rfm@gnu.org>
* Source/NSLayoutManager.m: loads of glyph changes - added some

86
Source/NSLayoutManager.m
View file

@ -1904,7 +1904,23 @@ _Sane(self);
#if USE_GLYPHS
if (_JumpToGlyph(self, glyphIndex) == NO)
{
[self glyphAtIndex: glyphIndex];
BOOL exists;
[self glyphAtIndex: glyphIndex isValidIndex: &exists];
if (exists == NO)
{
/*
* As a special case, the glyph index just beyond the end of
* the glyph stream is known to map to the character index just
* beyond the end of the text.
*/
if (glyphIndex == _numberOfGlyphs)
{
return [_textStorage length];
}
[NSException raise: NSRangeException
format: @"glyph index out of range"];
}
_JumpToGlyph(self, glyphIndex);
}
return _CharIndex(self);
@ -1926,11 +1942,34 @@ _Sane(self);
actualGlyphRange: (NSRange*)actualGlyphRange
{
#if USE_GLYPHS
unsigned pos;
NSRange cRange;
NSRange gRange = glyphRange;
unsigned cEnd;
BOOL exists;
[self glyphAtIndex: glyphRange.location]; // Force generation of glyphs.
/*
* Force generation of glyphs to fill gaps.
*/
[self glyphAtIndex: NSMaxRange(glyphRange)
isValidIndex: &exists];
/*
* Locate character index of location immediately beyond last glyph in range.
*/
if (exists == NO)
{
if (NSMaxRange(glyphRange) > _numberOfGlyphs)
{
[NSException raise: NSRangeException
format: @"glyph range too large"];
}
cEnd = [_textStorage length];
}
else
{
_JumpToGlyph(self, NSMaxRange(glyphRange));
cEnd = _CharIndex(self);
}
/*
* Locate the first glyph and step backwards to the earliest glyph with
@ -1938,52 +1977,13 @@ _Sane(self);
*/
_JumpToGlyph(self, glyphRange.location);
cRange.location = _CharIndex(self);
cRange.length = cEnd - cRange.location;
while (_Back(self) == YES && _CharIndex(self) == cRange.location)
{
gRange.location--;
gRange.length++;
}
if (glyphRange.length == 0)
{
/*
* For a zero length range, we don't need to locate an end glyph.
*/
cRange.length = 0;
}
else
{
BOOL exists;
/*
* Make sure that the last glyph in the range exists.
*/
[self glyphAtIndex: NSMaxRange(glyphRange)
isValidIndex: &exists];
if (exists == YES)
{
_JumpToGlyph(self, NSMaxRange(glyphRange));
gRange.length = _GlyphIndex(self) - gRange.location;
pos = _CharIndex(self);
}
else if (_numberOfGlyphs == NSMaxRange(glyphRange)-1)
{
_JumpToGlyph(self, NSMaxRange(glyphRange)-1);
gRange.length = _numberOfGlyphs - gRange.location;
pos = [_textStorage length];
}
else
{
[NSException raise: NSRangeException
format: @"glyph index out of range"];
}
while (_Back(self) == YES && _CharIndex(self) == pos)
{
gRange.length--;
}
cRange.length = pos - cRange.location;
}
if (actualGlyphRange != 0)
{
*actualGlyphRange = gRange;