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/*
* tkIcu.c --
*
* tkIcu.c implements various Tk commands which can find
* grapheme cluster and workchar bounderies in Unicode strings.
*
* Copyright © 2021 Jan Nijtmans
*
* See the file "license.terms" for information on usage and redistribution of
* this file, and for a DISCLAIMER OF ALL WARRANTIES.
*/
#include "tkInt.h"
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
/*
* Runtime linking of libicu.
*/
typedef enum UBreakIteratorTypex {
UBRK_CHARACTERX = 0,
UBRK_WORDX = 1
} UBreakIteratorTypex;
typedef enum UErrorCodex {
U_ZERO_ERRORZ = 0 /**< No error, no warning. */
} UErrorCodex;
typedef void *(*fn_icu_open)(UBreakIteratorTypex, const char *,
const uint16_t *, int32_t, UErrorCodex *);
typedef void (*fn_icu_close)(void *);
typedef int32_t (*fn_icu_preceding)(void *, int32_t);
typedef int32_t (*fn_icu_following)(void *, int32_t);
static struct {
int nopen;
Tcl_LoadHandle lib;
fn_icu_open open;
fn_icu_close close;
fn_icu_preceding preceding;
fn_icu_following following;
} icu_fns = {
0, NULL, NULL, NULL, NULL, NULL
};
#define FLAG_WORD 1
#define FLAG_FOLLOWING 4
#define icu_open icu_fns.open
#define icu_close icu_fns.close
#define icu_preceding icu_fns.preceding
#define icu_following icu_fns.following
TCL_DECLARE_MUTEX(icu_mutex);
static int
startEndOfCmd(
ClientData clientData,
Tcl_Interp *interp,
int objc,
Tcl_Obj *const objv[])
{
Tcl_DString ds;
TkSizeT len;
const char *str;
UErrorCodex errorCode;
void *it;
TkSizeT idx;
int flags = PTR2INT(clientData);
if (objc != 3) {
Tcl_WrongNumArgs(interp, 1 , objv, "str start");
return TCL_ERROR;
}
Tcl_DStringInit(&ds);
str = Tcl_GetStringFromObj(objv[1], &len);
Tcl_UtfToChar16DString(str, len, &ds);
if (TkGetIntForIndex(objv[2], Tcl_DStringLength(&ds)/2-1, 1, &idx) != TCL_OK) {
Tcl_DStringFree(&ds);
Tcl_SetObjResult(interp, Tcl_ObjPrintf("bad index \"%s\"", Tcl_GetString(objv[2])));
Tcl_SetErrorCode(interp, "TK", "ICU", "INDEX", NULL);
return TCL_ERROR;
}
it = icu_open((UBreakIteratorTypex)(PTR2INT(clientData)&3), "C",
(const uint16_t *)Tcl_DStringValue(&ds), -1, &errorCode);
if (flags & FLAG_FOLLOWING) {
idx = icu_following(it, idx);
} else {
idx = icu_preceding(it, idx);
}
Tcl_SetObjResult(interp, TkNewIndexObj(idx));
icu_close(it);
Tcl_DStringFree(&ds);
return TCL_OK;
}
void
Icu_Init(
Tcl_Interp *interp)
{
Tcl_MutexLock(&icu_mutex);
if (icu_fns.nopen == 0) {
int i = 0;
Tcl_Obj *nameobj;
static const char *iculibs[] = {
#if defined(_WIN32)
"cygicuuc68.dll",
"icuuc68.dll",
#elif defined(__CYGWIN__)
"cygicuuc68.dll",
#elif defined(MAC_OSX_TCL)
"libicuuc68.dylib",
#else
"libicuuc.so.68",
#endif
NULL
};
#if defined(_WIN32) && !defined(STATIC_BUILD)
if (!tclStubsPtr->tcl_CreateFileHandler) {
/* Not running on Cygwin, so don't try to load the cygwin icu dll */
i++;
}
#endif
while (iculibs[i] != NULL) {
Tcl_ResetResult(interp);
nameobj = Tcl_NewStringObj(iculibs[i], -1);
Tcl_IncrRefCount(nameobj);
if (Tcl_LoadFile(interp, nameobj, NULL, 0, NULL, &icu_fns.lib)
== TCL_OK) {
Tcl_DecrRefCount(nameobj);
break;
}
Tcl_DecrRefCount(nameobj);
++i;
}
if (icu_fns.lib != NULL) {
#define ICU_SYM(name) \
icu_fns.name = (fn_icu_ ## name) \
Tcl_FindSymbol(NULL, icu_fns.lib, "ubrk_" #name "_68")
ICU_SYM(open);
ICU_SYM(close);
ICU_SYM(preceding);
ICU_SYM(following);
#undef ICU_SYM
}
}
icu_fns.nopen++;
Tcl_MutexUnlock(&icu_mutex);
if (icu_fns.lib != NULL) {
Tcl_CreateObjCommand(interp, "::tk::startOfCluster", startEndOfCmd,
INT2PTR(0), NULL);
Tcl_CreateObjCommand(interp, "::tk::startOfNextWord", startEndOfCmd,
INT2PTR(FLAG_WORD|FLAG_FOLLOWING), NULL);
Tcl_CreateObjCommand(interp, "::tk::startOfPreviousWord", startEndOfCmd,
INT2PTR(FLAG_WORD), NULL);
Tcl_CreateObjCommand(interp, "::tk::endOfCluster", startEndOfCmd,
INT2PTR(FLAG_FOLLOWING), NULL);
Tcl_CreateObjCommand(interp, "::tk::endOfWord", startEndOfCmd,
INT2PTR(FLAG_WORD|FLAG_FOLLOWING), NULL);
}
}
/*
* Local Variables:
* mode: c
* c-basic-offset: 4
* fill-column: 78
* coding: utf-8
* End:
*/
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