func (c osx8Collator) Compare(a, b Input) int {
sa := C.CFStringCreateWithBytesNoCopy(
nil,
osxUInt8P(a.UTF8),
C.CFIndex(len(a.UTF8)),
C.kCFStringEncodingUTF8,
C.Boolean(0),
nil,
)
sb := C.CFStringCreateWithBytesNoCopy(
nil,
osxUInt8P(b.UTF8),
C.CFIndex(len(b.UTF8)),
C.kCFStringEncodingUTF8,
C.Boolean(0),
nil,
)
_range := C.CFRangeMake(0, C.CFStringGetLength(sa))
return int(C.CFStringCompareWithOptionsAndLocale(sa, sb, _range, c.opt, c.loc))
}
// The function reads the content of the text reader given as argument and
// produces a C.CFAttributedStringRef object that most closely represtns the
// input.
// The program needs to call C.CFRelease on the returned C.CFAttributedStringRef
// when it doesn't need it anymore to avoid any memory leak.
func CFAttributedStringCreateWithTextReader(r text.Reader) C.CFAttributedStringRef {
style := text.Style{}
b := &bytes.Buffer{}
b.Grow(1000)
styles := make([]C.Style__, 0, 10)
offset := 0
for {
c, err := r.ReadChar()
if err != nil {
break
}
s := text.StyleOf(c)
s.Offset = 0
if s != style {
style = s
s.Offset = offset
font := C.CTFontRef(nil)
switch f := s.Face.(type) {
case *face:
font = f.ref
}
styles = append(styles, C.Style__{
_range: C.CFRange{location: C.CFIndex(offset)},
font: font,
foreground: makeRGBA__(imageColor(s.Foreground, color.Black)),
background: makeRGBA__(imageColor(s.Background, color.Transparent)),
})
}
b.WriteRune(c.Rune)
offset++
}
if n := len(styles); n != 0 {
n--
styles[n]._range.length = C.CFIndex(offset) - styles[n]._range.location
for i := range styles[:n] {
s0 := &styles[i]
s1 := &styles[i+1]
s0._range.length = s1._range.location - s0._range.location
}
}
d := b.Bytes()
s := C.CFStringCreateWithBytesNoCopy(
nil,
(*C.UInt8)(&d[0]),
C.CFIndex(len(d)),
C.kCFStringEncodingUTF8,
0,
C.kCFAllocatorNull,
)
defer C.CFRelease(C.CFTypeRef(s))
return C.CFAttributedStringCreateWithStyles__(nil, s, &styles[0], C.size_t(len(styles)))
}