vendor/golang.org/x/text/cases/icu.go

   1 // Copyright 2016 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 // +build icu
   6
   7 package cases
   8
   9 // Ideally these functions would be defined in a test file, but go test doesn't
  10 // allow CGO in tests. The build tag should ensure either way that these
  11 // functions will not end up in the package.
  12
  13 // TODO: Ensure that the correct ICU version is set.
  14
  15 /*
  16 #cgo LDFLAGS: -licui18n.57 -licuuc.57
  17 #include <stdlib.h>
  18 #include <unicode/ustring.h>
  19 #include <unicode/utypes.h>
  20 #include <unicode/localpointer.h>
  21 #include <unicode/ucasemap.h>
  22 */
  23 import "C"
  24
  25 import "unsafe"
  26
  27 func doICU(tag, caser, input string) string {
  28         err := C.UErrorCode(0)
  29         loc := C.CString(tag)
  30         cm := C.ucasemap_open(loc, C.uint32_t(0), &err)
  31
  32         buf := make([]byte, len(input)*4)
  33         dst := (*C.char)(unsafe.Pointer(&buf[0]))
  34         src := C.CString(input)
  35
  36         cn := C.int32_t(0)
  37
  38         switch caser {
  39         case "fold":
  40                 cn = C.ucasemap_utf8FoldCase(cm,
  41                         dst, C.int32_t(len(buf)),
  42                         src, C.int32_t(len(input)),
  43                         &err)
  44         case "lower":
  45                 cn = C.ucasemap_utf8ToLower(cm,
  46                         dst, C.int32_t(len(buf)),
  47                         src, C.int32_t(len(input)),
  48                         &err)
  49         case "upper":
  50                 cn = C.ucasemap_utf8ToUpper(cm,
  51                         dst, C.int32_t(len(buf)),
  52                         src, C.int32_t(len(input)),
  53                         &err)
  54         case "title":
  55                 cn = C.ucasemap_utf8ToTitle(cm,
  56                         dst, C.int32_t(len(buf)),
  57                         src, C.int32_t(len(input)),
  58                         &err)
  59         }
  60         return string(buf[:cn])
  61 }