darwin.go

Documentation: golang.org/x/text/collate/tools/colcmp

     1  // Copyright 2012 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build darwin
     6  
     7  package main
     8  
     9  /*
    10  #cgo LDFLAGS: -framework CoreFoundation
    11  #include <CoreFoundation/CFBase.h>
    12  #include <CoreFoundation/CoreFoundation.h>
    13  */
    14  import "C"
    15  import (
    16  	"unsafe"
    17  )
    18  
    19  func init() {
    20  	AddFactory(CollatorFactory{"osx", newOSX16Collator,
    21  		"OS X/Darwin collator, using native strings."})
    22  	AddFactory(CollatorFactory{"osx8", newOSX8Collator,
    23  		"OS X/Darwin collator for UTF-8."})
    24  }
    25  
    26  func osxUInt8P(s []byte) *C.UInt8 {
    27  	return (*C.UInt8)(unsafe.Pointer(&s[0]))
    28  }
    29  
    30  func osxCharP(s []uint16) *C.UniChar {
    31  	return (*C.UniChar)(unsafe.Pointer(&s[0]))
    32  }
    33  
    34  // osxCollator implements an Collator based on OS X's CoreFoundation.
    35  type osxCollator struct {
    36  	loc C.CFLocaleRef
    37  	opt C.CFStringCompareFlags
    38  }
    39  
    40  func (c *osxCollator) init(locale string) {
    41  	l := C.CFStringCreateWithBytes(
    42  		C.kCFAllocatorDefault,
    43  		osxUInt8P([]byte(locale)),
    44  		C.CFIndex(len(locale)),
    45  		C.kCFStringEncodingUTF8,
    46  		C.Boolean(0),
    47  	)
    48  	c.loc = C.CFLocaleCreate(C.kCFAllocatorDefault, l)
    49  }
    50  
    51  func newOSX8Collator(locale string) (Collator, error) {
    52  	c := &osx8Collator{}
    53  	c.init(locale)
    54  	return c, nil
    55  }
    56  
    57  func newOSX16Collator(locale string) (Collator, error) {
    58  	c := &osx16Collator{}
    59  	c.init(locale)
    60  	return c, nil
    61  }
    62  
    63  func (c osxCollator) Key(s Input) []byte {
    64  	return nil // sort keys not supported by OS X CoreFoundation
    65  }
    66  
    67  type osx8Collator struct {
    68  	osxCollator
    69  }
    70  
    71  type osx16Collator struct {
    72  	osxCollator
    73  }
    74  
    75  func (c osx16Collator) Compare(a, b Input) int {
    76  	sa := C.CFStringCreateWithCharactersNoCopy(
    77  		C.kCFAllocatorDefault,
    78  		osxCharP(a.UTF16),
    79  		C.CFIndex(len(a.UTF16)),
    80  		C.kCFAllocatorDefault,
    81  	)
    82  	sb := C.CFStringCreateWithCharactersNoCopy(
    83  		C.kCFAllocatorDefault,
    84  		osxCharP(b.UTF16),
    85  		C.CFIndex(len(b.UTF16)),
    86  		C.kCFAllocatorDefault,
    87  	)
    88  	_range := C.CFRangeMake(0, C.CFStringGetLength(sa))
    89  	return int(C.CFStringCompareWithOptionsAndLocale(sa, sb, _range, c.opt, c.loc))
    90  }
    91  
    92  func (c osx8Collator) Compare(a, b Input) int {
    93  	sa := C.CFStringCreateWithBytesNoCopy(
    94  		C.kCFAllocatorDefault,
    95  		osxUInt8P(a.UTF8),
    96  		C.CFIndex(len(a.UTF8)),
    97  		C.kCFStringEncodingUTF8,
    98  		C.Boolean(0),
    99  		C.kCFAllocatorDefault,
   100  	)
   101  	sb := C.CFStringCreateWithBytesNoCopy(
   102  		C.kCFAllocatorDefault,
   103  		osxUInt8P(b.UTF8),
   104  		C.CFIndex(len(b.UTF8)),
   105  		C.kCFStringEncodingUTF8,
   106  		C.Boolean(0),
   107  		C.kCFAllocatorDefault,
   108  	)
   109  	_range := C.CFRangeMake(0, C.CFStringGetLength(sa))
   110  	return int(C.CFStringCompareWithOptionsAndLocale(sa, sb, _range, c.opt, c.loc))
   111  }
   112
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