summaryrefslogtreecommitdiffstats
path: root/generic/tkIcu.c
blob: 563933627cae41db24be952b2cd30b56240c4aea (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
/*
 * 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"

/*
 * 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);
typedef int32_t	(*fn_icu_previous)(void *);
typedef int32_t	(*fn_icu_next)(void *);
typedef void	(*fn_icu_setText)(void *, const void *, int32_t, UErrorCodex *);

static struct {
    size_t				nopen;
    Tcl_LoadHandle		lib;
    fn_icu_open			open;
    fn_icu_close		close;
    fn_icu_preceding	preceding;
    fn_icu_following	following;
    fn_icu_previous	previous;
    fn_icu_next	next;
    fn_icu_setText	setText;
} icu_fns = {
    0, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL
};

#define FLAG_WORD 1
#define FLAG_FOLLOWING 4
#define FLAG_SPACE 8

#define icu_open			icu_fns.open
#define icu_close			icu_fns.close
#define icu_preceding		icu_fns.preceding
#define icu_following		icu_fns.following
#define icu_previous		icu_fns.previous
#define icu_next		icu_fns.next
#define icu_setText		icu_fns.setText

TCL_DECLARE_MUTEX(icu_mutex);

static int
startEndOfCmd(
    void *clientData,
    Tcl_Interp *interp,
    int objc,
    Tcl_Obj *const objv[])
{
    Tcl_DString ds;
    Tcl_Size len;
    const char *str;
    UErrorCodex errorCode = U_ZERO_ERRORZ;
    void *it;
    Tcl_Size idx;
    int flags = PTR2INT(clientData);
    const uint16_t *ustr;
    const char *locale = NULL;

    if ((unsigned)(objc - 3) > 1) {
	Tcl_WrongNumArgs(interp, 1 , objv, "str start ?locale?");
	return TCL_ERROR;
    }
    if (objc > 3) {
	locale = Tcl_GetString(objv[3]);
	if (!*locale) {
	    locale = NULL;
	}
    }
    Tcl_DStringInit(&ds);
    str = Tcl_GetStringFromObj(objv[1], &len);
    Tcl_UtfToChar16DString(str, len, &ds);
    len = Tcl_DStringLength(&ds)/2;
    if (TkGetIntForIndex(objv[2], len-1, 0, &idx) != TCL_OK) {
	Tcl_DStringFree(&ds);
	Tcl_SetObjResult(interp, Tcl_ObjPrintf("bad index \"%s\": must be integer?[+-]integer?, end?[+-]integer?, or \"\"", Tcl_GetString(objv[2])));
	Tcl_SetErrorCode(interp, "TK", "ICU", "INDEX", NULL);
	return TCL_ERROR;
    }

    it = icu_open((UBreakIteratorTypex)(flags&3), locale,
    		NULL, -1, &errorCode);
    if (it != NULL) {
	errorCode = U_ZERO_ERRORZ;
	ustr = (const uint16_t *)Tcl_DStringValue(&ds);
	icu_setText(it, ustr, len, &errorCode);
    }
    if (it == NULL || errorCode != U_ZERO_ERRORZ) {
    	Tcl_DStringFree(&ds);
    	Tcl_SetObjResult(interp, Tcl_ObjPrintf("cannot open ICU iterator, errorcode: %d", (int)errorCode));
    	Tcl_SetErrorCode(interp, "TK", "ICU", "CANNOTOPEN", NULL);
    	return TCL_ERROR;
    }
    if (flags & FLAG_FOLLOWING) {
	if ((idx < 0) && (flags & FLAG_WORD)) {
	    idx = 0;
	}
	idx = icu_following(it, idx);
	if ((flags & FLAG_WORD) && idx >= len) {
	    idx = -1;
	}
    } else if (idx > 0) {
	if (!(flags & FLAG_WORD)) {
		idx += 1 + (((ustr[idx]&0xFFC0) == 0xD800) && ((ustr[idx+1]&0xFFC0) == 0xDC00));
	}
	idx = icu_preceding(it, idx);
	if (idx == 0 && (flags & FLAG_WORD)) {
	    flags &= ~FLAG_WORD; /* If 0 is reached here, don't do a further search */
	}
    }
    if ((flags & FLAG_WORD) && (idx != TCL_INDEX_NONE)) {
	if (!(flags & FLAG_SPACE) == ((idx >= len) || Tcl_UniCharIsSpace(ustr[idx]))) {
	    if (flags & FLAG_FOLLOWING) {
		idx = icu_next(it);
		if (idx >= len) {
		    idx = TCL_INDEX_NONE;
		}
	    } else {
		idx = icu_previous(it);
	    }
	} else if (idx == 0 && !(flags & FLAG_FOLLOWING)) {
	    idx = TCL_INDEX_NONE;
	}
    }
    icu_close(it);
    Tcl_DStringFree(&ds);
    if (idx != TCL_INDEX_NONE) {
	Tcl_SetObjResult(interp, TkNewIndexObj(idx));
    }
    return TCL_OK;
}

/*
 *----------------------------------------------------------------------
 *
 * SysNotifyDeleteCmd --
 *
 *      Delete notification and clean up.
 *
 * Results:
 *	Window destroyed.
 *
 * Side effects:
 *	None.
 *
 *----------------------------------------------------------------------
 */

static void
icuCleanup(
    TCL_UNUSED(void *))
{
    Tcl_MutexLock(&icu_mutex);
    if (icu_fns.nopen-- <= 1) {
	if (icu_fns.lib != NULL) {
	    Tcl_FSUnloadFile(NULL, icu_fns.lib);
	}
	memset(&icu_fns, 0, sizeof(icu_fns));
    }
    Tcl_MutexUnlock(&icu_mutex);
}

void
Icu_Init(
    Tcl_Interp *interp)
{
    Tcl_MutexLock(&icu_mutex);
    char symbol[24];
    char icuversion[4] = "_75"; /* Highest ICU version + 1 */

    if (icu_fns.nopen == 0) {
	int i = 0;
	Tcl_Obj *nameobj;
	static const char *iculibs[] = {
#if defined(_WIN32)
	    "icuuc??.dll", /* When running under Windows, user-provided */
	    NULL,
	    "cygicuuc??.dll", /* When running under Cygwin */
#elif defined(__CYGWIN__)
	    "cygicuuc??.dll",
#elif defined(MAC_OSX_TCL)
	    "libicuuc.??.dylib",
#else
	    "libicuuc.so.??",
#endif
	    NULL
	};

	/* Going back down to ICU version 50 */
	while ((icu_fns.lib == NULL) && (icuversion[1] >= '5')) {
	    if (--icuversion[2] < '0') {
		icuversion[1]--; icuversion[2] = '9';
	    }
#if defined(_WIN32) && !defined(STATIC_BUILD)
	    if (tclStubsPtr->tcl_CreateFileHandler) {
		/* Running on Cygwin, so try to load the cygwin icu dll */
		i = 2;
	    } else
#endif
	    i = 0;
	    while (iculibs[i] != NULL) {
		Tcl_ResetResult(interp);
		nameobj = Tcl_NewStringObj(iculibs[i], TCL_INDEX_NONE);
		char *nameStr = Tcl_GetString(nameobj);
		char *p = strchr(nameStr, '?');
		if (p != NULL) {
		    memcpy(p, icuversion+1, 2);
		}
		Tcl_IncrRefCount(nameobj);
		if (Tcl_LoadFile(interp, nameobj, NULL, 0, NULL, &icu_fns.lib)
			== TCL_OK) {
		    if (p == NULL) {
			icuversion[0] = '\0';
		    }
		    Tcl_DecrRefCount(nameobj);
		    break;
		}
		Tcl_DecrRefCount(nameobj);
		++i;
	    }
	}
#if defined(_WIN32)
	if (icu_fns.lib == NULL) {
	    Tcl_ResetResult(interp);
		nameobj = Tcl_NewStringObj("icu.dll", TCL_INDEX_NONE);
		Tcl_IncrRefCount(nameobj);
		if (Tcl_LoadFile(interp, nameobj, NULL, 0, NULL, &icu_fns.lib)
			== TCL_OK) {
		    icuversion[0] = '\0';
		}
		Tcl_DecrRefCount(nameobj);
	}
	if (icu_fns.lib == NULL) {
	    Tcl_ResetResult(interp);
		nameobj = Tcl_NewStringObj("icuuc.dll", TCL_INDEX_NONE);
		Tcl_IncrRefCount(nameobj);
		if (Tcl_LoadFile(interp, nameobj, NULL, 0, NULL, &icu_fns.lib)
			== TCL_OK) {
		    icuversion[0] = '\0';
		}
		Tcl_DecrRefCount(nameobj);
	}
#endif
	if (icu_fns.lib != NULL) {
#define ICU_SYM(name)							\
	    strcpy(symbol, "ubrk_" #name ); \
	    strcat(symbol, icuversion); \
	    icu_fns.name = (fn_icu_ ## name)				\
		Tcl_FindSymbol(NULL, icu_fns.lib, symbol)
	    ICU_SYM(open);
	    ICU_SYM(close);
	    ICU_SYM(preceding);
	    ICU_SYM(following);
	    ICU_SYM(previous);
	    ICU_SYM(next);
	    ICU_SYM(setText);
#undef ICU_SYM
	}
    }
    Tcl_MutexUnlock(&icu_mutex);

    if (icu_fns.lib != NULL) {
	Tcl_CreateObjCommand(interp, "::tk::startOfCluster", startEndOfCmd,
		INT2PTR(0), icuCleanup);
	Tcl_CreateObjCommand(interp, "::tk::startOfNextWord", startEndOfCmd,
		INT2PTR(FLAG_WORD|FLAG_FOLLOWING), icuCleanup);
	Tcl_CreateObjCommand(interp, "::tk::startOfPreviousWord", startEndOfCmd,
		INT2PTR(FLAG_WORD), icuCleanup);
	Tcl_CreateObjCommand(interp, "::tk::endOfCluster", startEndOfCmd,
		INT2PTR(FLAG_FOLLOWING), icuCleanup);
	Tcl_CreateObjCommand(interp, "::tk::endOfWord", startEndOfCmd,
		INT2PTR(FLAG_WORD|FLAG_FOLLOWING|FLAG_SPACE), icuCleanup);
    icu_fns.nopen += 5;
    }
}

/*
 * Local Variables:
 * mode: c
 * c-basic-offset: 4
 * fill-column: 78
 * coding: utf-8
 * End:
 */