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Diffstat (limited to 'libX11/modules/im/ximcp/imThaiFlt.c')
| -rw-r--r-- | libX11/modules/im/ximcp/imThaiFlt.c | 1380 |
1 files changed, 1380 insertions, 0 deletions
diff --git a/libX11/modules/im/ximcp/imThaiFlt.c b/libX11/modules/im/ximcp/imThaiFlt.c new file mode 100644 index 000000000..ac851963e --- /dev/null +++ b/libX11/modules/im/ximcp/imThaiFlt.c @@ -0,0 +1,1380 @@ +/* $Xorg: imThaiFlt.c,v 1.5 2001/02/09 02:03:39 xorgcvs Exp $ */ +/*********************************************************** + +Copyright 1993, 1998 The Open Group + +Permission to use, copy, modify, distribute, and sell this software and its +documentation for any purpose is hereby granted without fee, provided that +the above copyright notice appear in all copies and that both that +copyright notice and this permission notice appear in supporting +documentation. + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN +AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN +CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + +Except as contained in this notice, the name of The Open Group shall not be +used in advertising or otherwise to promote the sale, use or other dealings +in this Software without prior written authorization from The Open Group. + + +Copyright 1993 by Digital Equipment Corporation, Maynard, Massachusetts. + + All Rights Reserved + +Permission to use, copy, modify, and distribute this software and its +documentation for any purpose and without fee is hereby granted, +provided that the above copyright notice appear in all copies and that +both that copyright notice and this permission notice appear in +supporting documentation, and that the name of Digital not be +used in advertising or publicity pertaining to distribution of the +software without specific, written prior permission. + +DIGITAL DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING +ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL +DIGITAL BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR +ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, +WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, +ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS +SOFTWARE. + +******************************************************************/ +/* $XFree86: xc/lib/X11/imThaiFlt.c,v 3.22tsi Exp $ */ + +/* +**++ +** FACILITY: +** +** Xlib +** +** ABSTRACT: +** +** Thai specific functions. +** Handles character classifications, composibility checking, +** Input sequence check and other Thai specific requirements +** according to WTT specification and DEC extensions. +** +** MODIFICATION HISTORY: +** +**/ + +#ifdef HAVE_CONFIG_H +#include <config.h> +#endif +#include <stdio.h> +#include <X11/Xlib.h> +#include <X11/Xmd.h> +#include <X11/keysym.h> +#include <X11/Xutil.h> +#include "Xlibint.h" +#include "Xlcint.h" +#include "Ximint.h" +#include "XimThai.h" +#include "XlcPubI.h" + + +#define SPACE 32 + +/* character classification table */ +#define TACTIS_CHARS 256 +Private +char const tactis_chtype[TACTIS_CHARS] = { + CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, /* 0 - 7 */ + CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, /* 8 - 15 */ + CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, /* 16 - 23 */ + CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, /* 24 - 31 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 32 - 39 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 40 - 47 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 48 - 55 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 56 - 63 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 64 - 71 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 72 - 79 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 80 - 87 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 88 - 95 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 96 - 103 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 104 - 111 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 112 - 119 */ + NON, NON, NON, NON, NON, NON, NON, CTRL, /* 120 - 127 */ + CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, /* 128 - 135 */ + CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, /* 136 - 143 */ + CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, /* 144 - 151 */ + CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, CTRL, /* 152 - 159 */ + NON, CONS, CONS, CONS, CONS, CONS, CONS, CONS, /* 160 - 167 */ + CONS, CONS, CONS, CONS, CONS, CONS, CONS, CONS, /* 168 - 175 */ + CONS, CONS, CONS, CONS, CONS, CONS, CONS, CONS, /* 176 - 183 */ + CONS, CONS, CONS, CONS, CONS, CONS, CONS, CONS, /* 184 - 191 */ + CONS, CONS, CONS, CONS, FV3, CONS, FV3, CONS, /* 192 - 199 */ + CONS, CONS, CONS, CONS, CONS, CONS, CONS, NON, /* 200 - 207 */ + FV1, AV2, FV1, FV1, AV1, AV3, AV2, AV3, /* 208 - 215 */ + BV1, BV2, BD, NON, NON, NON, NON, NON, /* 216 - 223 */ + LV, LV, LV, LV, LV, FV2, NON, AD2, /* 224 - 231 */ + TONE, TONE, TONE, TONE, AD1, AD1, AD3, NON, /* 232 - 239 */ + NON, NON, NON, NON, NON, NON, NON, NON, /* 240 - 247 */ + NON, NON, NON, NON, NON, NON, NON, CTRL /* 248 - 255 */ +}; + +/* Composibility checking tables */ +#define NC 0 /* NOT COMPOSIBLE - following char displays in next cell */ +#define CP 1 /* COMPOSIBLE - following char is displayed in the same cell + as leading char, also implies ACCEPT */ +#define XC 3 /* Non-display */ +#define AC 4 /* ACCEPT - display the following char in the next cell */ +#define RJ 5 /* REJECT - discard that following char, ignore it */ + +#define CH_CLASSES 17 /* 17 classes of chars */ + +Private +char const write_rules_lookup[CH_CLASSES][CH_CLASSES] = { + /* Table 0: writing/outputing rules */ + /* row: leading char, column: following char */ +/* CTRL NON CONS LV FV1 FV2 FV3 BV1 BV2 BD TONE AD1 AD2 AD3 AV1 AV2 AV3 */ + {XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*CTRL*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*NON*/ + ,{XC, NC, NC, NC, NC, NC, NC, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP}/*CONS*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*LV*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*FV1*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*FV2*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*FV3*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, CP, NC, NC, NC, NC, NC}/*BV1*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, NC, NC, NC, NC, NC, NC}/*BV2*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*BD*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*TONE*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*AD1*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*AD2*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC, NC}/*AD3*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, CP, NC, NC, NC, NC, NC}/*AV1*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, NC, NC, NC, NC, NC, NC}/*AV2*/ + ,{XC, NC, NC, NC, NC, NC, NC, NC, NC, NC, CP, NC, CP, NC, NC, NC, NC}/*AV3*/ +}; + +Private +char const wtt_isc1_lookup[CH_CLASSES][CH_CLASSES] = { + /* Table 1: WTT default input sequence check rules */ + /* row: leading char, column: following char */ +/* CTRL NON CONS LV FV1 FV2 FV3 BV1 BV2 BD TONE AD1 AD2 AD3 AV1 AV2 AV3 */ + {XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*CTRL*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*NON*/ + ,{XC, AC, AC, AC, AC, AC, AC, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP}/*CONS*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*LV*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV1*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV2*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV3*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*BV1*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*BV2*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*BD*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*TONE*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD1*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD2*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD3*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*AV1*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*AV2*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, CP, RJ, RJ, RJ, RJ}/*AV3*/ +}; + +Private +char const wtt_isc2_lookup[CH_CLASSES][CH_CLASSES] = { + /* Table 2: WTT strict input sequence check rules */ + /* row: leading char, column: following char */ +/* CTRL NON CONS LV FV1 FV2 FV3 BV1 BV2 BD TONE AD1 AD2 AD3 AV1 AV2 AV3 */ + {XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*CTRL*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*NON*/ + ,{XC, AC, AC, AC, AC, RJ, AC, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP}/*CONS*/ + ,{XC, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*LV*/ + ,{XC, AC, AC, AC, AC, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV1*/ + ,{XC, AC, AC, AC, AC, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV2*/ + ,{XC, AC, AC, AC, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV3*/ + ,{XC, AC, AC, AC, AC, RJ, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*BV1*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*BV2*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*BD*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*TONE*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD1*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD2*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD3*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*AV1*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*AV2*/ + ,{XC, AC, AC, AC, RJ, RJ, AC, RJ, RJ, RJ, CP, RJ, CP, RJ, RJ, RJ, RJ}/*AV3*/ +}; + +Private +char const thaicat_isc_lookup[CH_CLASSES][CH_CLASSES] = { + /* Table 3: Thaicat input sequence check rules */ + /* row: leading char, column: following char */ +/* CTRL NON CONS LV FV1 FV2 FV3 BV1 BV2 BD TONE AD1 AD2 AD3 AV1 AV2 AV3 */ + {XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*CTRL*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*NON*/ + ,{XC, AC, AC, AC, AC, AC, AC, CP, CP, CP, CP, CP, CP, CP, CP, CP, CP}/*CONS*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*LV*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV1*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*FV2*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ} /*FV3*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*BV1*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*BV2*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*BD*/ + ,{XC, AC, AC, AC, AC, AC, AC, CP, CP, RJ, RJ, RJ, RJ, RJ, CP, CP, CP}/*TONE*/ + ,{XC, AC, AC, AC, AC, AC, AC, CP, RJ, RJ, RJ, RJ, RJ, RJ, CP, RJ, RJ}/*AD1*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, CP}/*AD2*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ, RJ}/*AD3*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, CP, RJ, RJ, RJ, RJ, RJ}/*AV1*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, RJ, RJ, RJ, RJ, RJ}/*AV2*/ + ,{XC, AC, AC, AC, AC, AC, AC, RJ, RJ, RJ, CP, RJ, CP, RJ, RJ, RJ, RJ}/*AV3*/ +}; + + +/* returns classification of a char */ +Private int +THAI_chtype (unsigned char ch) +{ + return tactis_chtype[ch]; +} + +#ifdef UNUSED +/* returns the display level */ +Private int +THAI_chlevel (unsigned char ch) +{ + int chlevel; + + switch (tactis_chtype[ch]) + { + case CTRL: + chlevel = NON; + break; + case BV1: + case BV2: + case BD: + chlevel = BELOW; + break; + case TONE: + case AD1: + case AD2: + chlevel = TOP; + break; + case AV1: + case AV2: + case AV3: + case AD3: + chlevel = ABOVE; + break; + case NON: + case CONS: + case LV: + case FV1: + case FV2: + case FV3: + default: /* if tactis_chtype is invalid */ + chlevel = BASE; + break; + } + return chlevel; +} + + +/* return True if char is non-spacing */ +Private Bool +THAI_isdead (unsigned char ch) +{ + return ((tactis_chtype[ch] == CTRL) || (tactis_chtype[ch] == BV1) || + (tactis_chtype[ch] == BV2) || (tactis_chtype[ch] == BD) || + (tactis_chtype[ch] == TONE) || (tactis_chtype[ch] == AD1) || + (tactis_chtype[ch] == AD2) || (tactis_chtype[ch] == AD3) || + (tactis_chtype[ch] == AV1) || (tactis_chtype[ch] == AV2) || + (tactis_chtype[ch] == AV3)); +} + + +/* return True if char is consonant */ +Private Bool +THAI_iscons (unsigned char ch) +{ + return (tactis_chtype[ch] == CONS); +} + + +/* return True if char is vowel */ +Private Bool +THAI_isvowel (unsigned char ch) +{ + return ((tactis_chtype[ch] == LV) || (tactis_chtype[ch] == FV1) || + (tactis_chtype[ch] == FV2) || (tactis_chtype[ch] == FV3) || + (tactis_chtype[ch] == BV1) || (tactis_chtype[ch] == BV2) || + (tactis_chtype[ch] == AV1) || (tactis_chtype[ch] == AV2) || + (tactis_chtype[ch] == AV3)); +} + + +/* return True if char is tonemark */ +Private Bool +THAI_istone (unsigned char ch) +{ + return (tactis_chtype[ch] == TONE); +} +#endif + +Private Bool +THAI_iscomposible ( + unsigned char follow_ch, + unsigned char lead_ch) +{/* "Can follow_ch be put in the same display cell as lead_ch?" */ + + return (write_rules_lookup[THAI_chtype(lead_ch)][THAI_chtype(follow_ch)] + == CP); +} + +Private Bool +THAI_isaccepted ( + unsigned char follow_ch, + unsigned char lead_ch, + unsigned char mode) +{ + Bool iskeyvalid; /* means "Can follow_ch be keyed in after lead_ch?" */ + + switch (mode) + { + case WTT_ISC1: + iskeyvalid = + (wtt_isc1_lookup[THAI_chtype(lead_ch)][THAI_chtype(follow_ch)] != RJ); + break; + case WTT_ISC2: + iskeyvalid = + (wtt_isc2_lookup[THAI_chtype(lead_ch)][THAI_chtype(follow_ch)] != RJ); + break; + case THAICAT_ISC: + iskeyvalid = + (thaicat_isc_lookup[THAI_chtype(lead_ch)][THAI_chtype(follow_ch)] != RJ); + break; + default: + iskeyvalid = True; + break; + } + + return iskeyvalid; +} + +#ifdef UNUSED +Private void +THAI_apply_write_rules( + unsigned char *instr, + unsigned char *outstr, + unsigned char insert_ch, + int *num_insert_ch) +{ +/* +Input parameters: + instr - input string + insert_ch specify what char to be added when invalid composition is found +Output parameters: + outstr - output string after input string has been applied the rules + num_insert_ch - number of insert_ch added to outstr. +*/ + unsigned char *lead_ch = NULL, *follow_ch = NULL, *out_ch = NULL; + + *num_insert_ch = 0; + lead_ch = follow_ch = instr; + out_ch = outstr; + if ((*lead_ch == '\0') || !(THAI_find_chtype(instr,DEAD))) + { /* Empty string or can't find any non-spacing char*/ + strcpy((char *)outstr, (char *)instr); + } else { /* String of length >= 1, keep looking */ + follow_ch++; + if (THAI_isdead(*lead_ch)) { /* is first char non-spacing? */ + *out_ch++ = SPACE; + (*num_insert_ch)++; + } + *out_ch++ = *lead_ch; + while (*follow_ch != '\0') /* more char in string to check */ + { + if (THAI_isdead(*follow_ch) && + !THAI_iscomposible(*follow_ch,*lead_ch)) + { + *out_ch++ = SPACE; + (*num_insert_ch)++; + } + *out_ch++ = *follow_ch; + lead_ch = follow_ch; + follow_ch++; + } + *out_ch = '\0'; + } +} + +Private int +THAI_find_chtype ( + unsigned char *instr, + int chtype) +{ +/* +Input parameters: + instr - input string + chtype - type of character to look for +Output parameters: + function returns first position of character with matched chtype + function returns -1 if it does not find. +*/ + int i = 0, position = -1; + + switch (chtype) + { + case DEAD: + for (i = 0; *instr != '\0' && THAI_isdead(*instr); i++, instr++) + ; + if (*instr != '\0') position = i; + break; + default: + break; + } + return position; +} + + +Private int +THAI_apply_scm( + unsigned char *instr, + unsigned char *outstr, + unsigned char spec_ch, + int num_sp, + unsigned char insert_ch) +{ + unsigned char *scan, *outch; + int i, dead_count, found_count; + Bool isconsecutive; + + scan = instr; + outch = outstr; + dead_count = found_count = 0; + isconsecutive = False; + while (*scan != '\0') { + if (THAI_isdead(*scan)) + dead_count++; /* count number of non-spacing char */ + if (*scan == spec_ch) + if (!isconsecutive) + found_count++; /* count number consecutive spec char found */ + *outch++ = *scan++; + if (found_count == num_sp) { + for (i = 0; i < dead_count; i++) + *outch++ = insert_ch; + dead_count = found_count = 0; + } + } + /* what to return? */ + return 0; /* probably not right but better than returning garbage */ +} + + +/* The following functions are copied from XKeyBind.c */ + +Private void ComputeMaskFromKeytrans(); +Private int IsCancelComposeKey(KeySym *symbol, XKeyEvent *event); +Private void SetLed(Display *dpy, int num, int state); +Private CARD8 FindKeyCode(); + + +/* The following functions are specific to this module */ + +Private int XThaiTranslateKey(); +Private int XThaiTranslateKeySym(); + + +Private KeySym HexIMNormalKey( + XicThaiPart *thai_part, + KeySym symbol, + XKeyEvent *event); +Private KeySym HexIMFirstComposeKey( + XicThaiPart *thai_part, + KeySym symbol, + XKeyEvent *event); +Private KeySym HexIMSecondComposeKey( + XicThaiPart *thai_part, + KeySym symbol + XKeyEvent *event); +Private KeySym HexIMComposeSequence(KeySym ks1, KeySym ks2); +Private void InitIscMode(Xic ic); +Private Bool ThaiComposeConvert( + Display *dpy, + KeySym insym, + KeySym *outsym, KeySym *lower, KeySym *upper); +#endif + +/* + * Definitions + */ + +#define BellVolume 0 + +#define ucs2tis(wc) \ + (unsigned char) ( \ + (0<=(wc)&&(wc)<=0x7F) ? \ + (wc) : \ + ((0x0E01<=(wc)&&(wc)<=0x0E5F) ? ((wc)-0x0E00+0xA0) : 0)) +/* "c" is an unsigned char */ +#define tis2ucs(c) \ + ( \ + ((c)<=0x7F) ? \ + (wchar_t)(c) : \ + ((0x0A1<=(c)) ? ((wchar_t)(c)-0xA0+0x0E00) : 0)) + +/* + * Macros to save and recall last input character in XIC + */ +#define IC_SavePreviousChar(ic,ch) \ + ((ic)->private.local.base.mb[(ic)->private.local.base.tree[(ic)->private.local.context].mb] = (char) (ch)) +#define IC_ClearPreviousChar(ic) \ + ((ic)->private.local.base.mb[(ic)->private.local.base.tree[(ic)->private.local.context].mb] = 0) +#define IC_GetPreviousChar(ic) \ + (IC_RealGetPreviousChar(ic,1)) +#define IC_GetContextChar(ic) \ + (IC_RealGetPreviousChar(ic,2)) +#define IC_DeletePreviousChar(ic) \ + (IC_RealDeletePreviousChar(ic)) + +Private unsigned char +IC_RealGetPreviousChar(Xic ic, unsigned short pos) +{ + XICCallback* cb = &ic->core.string_conversion_callback; + DefTreeBase *b = &ic->private.local.base; + + if (cb && cb->callback) { + XIMStringConversionCallbackStruct screc; + unsigned char c; + + /* Use a safe value of position = 0 and stretch the range to desired + * place, as XIM protocol is unclear here whether it could be negative + */ + screc.position = 0; + screc.direction = XIMBackwardChar; + screc.operation = XIMStringConversionRetrieval; + screc.factor = pos; + screc.text = 0; + + (cb->callback)((XIC)ic, cb->client_data, (XPointer)&screc); + if (!screc.text) + return (unsigned char) b->mb[b->tree[(ic)->private.local.context].mb]; + if ((screc.text->feedback && + *screc.text->feedback == XIMStringConversionLeftEdge) || + screc.text->length < 1) + { + c = 0; + } else { + if (screc.text->encoding_is_wchar) { + c = ucs2tis(screc.text->string.wcs[0]); + XFree(screc.text->string.wcs); + } else { + c = screc.text->string.mbs[0]; + XFree(screc.text->string.mbs); + } + } + XFree(screc.text); + return c; + } else { + return (unsigned char) b->mb[b->tree[(ic)->private.local.context].mb]; + } +} + +Private unsigned char +IC_RealDeletePreviousChar(Xic ic) +{ + XICCallback* cb = &ic->core.string_conversion_callback; + + if (cb && cb->callback) { + XIMStringConversionCallbackStruct screc; + unsigned char c; + + screc.position = 0; + screc.direction = XIMBackwardChar; + screc.operation = XIMStringConversionSubstitution; + screc.factor = 1; + screc.text = 0; + + (cb->callback)((XIC)ic, cb->client_data, (XPointer)&screc); + if (!screc.text) { return 0; } + if ((screc.text->feedback && + *screc.text->feedback == XIMStringConversionLeftEdge) || + screc.text->length < 1) + { + c = 0; + } else { + if (screc.text->encoding_is_wchar) { + c = ucs2tis(screc.text->string.wcs[0]); + XFree(screc.text->string.wcs); + } else { + c = screc.text->string.mbs[0]; + XFree(screc.text->string.mbs); + } + } + XFree(screc.text); + return c; + } else { + return 0; + } +} +/* + * Input sequence check mode in XIC + */ +#define IC_IscMode(ic) ((ic)->private.local.thai.input_mode) + +/* + * Max. size of string handled by the two String Lookup functions. + */ +#define STR_LKUP_BUF_SIZE 256 + +/* + * Size of buffer to contain previous locale name. + */ +#define SAV_LOCALE_NAME_SIZE 256 + +/* + * Size of buffer to contain the IM modifier. + */ +#define MAXTHAIIMMODLEN 20 + +#define AllMods (ShiftMask|LockMask|ControlMask| \ + Mod1Mask|Mod2Mask|Mod3Mask|Mod4Mask|Mod5Mask) + + +#define IsISOControlKey(ks) ((ks) >= XK_2 && (ks) <= XK_8) + +#define IsValidControlKey(ks) (((((ks)>=XK_A && (ks)<=XK_asciitilde) || \ + (ks)==XK_space || (ks)==XK_Delete) && \ + ((ks)!=0))) + +#define COMPOSE_LED 2 + +#ifdef UNUSED +typedef KeySym (*StateProc)( + XicThaiPart *thai_part, + KeySym symbol, + XKeyEvent *event); + + +/* + * macros to classify XKeyEvent state field + */ + +#define IsShift(state) (((state) & ShiftMask) != 0) +#define IsLock(state) (((state) & LockMask) != 0) +#define IsControl(state) (((state) & ControlMask) != 0) +#define IsMod1(state) (((state) & Mod1Mask) != 0) +#define IsMod2(state) (((state) & Mod2Mask) != 0) +#define IsMod3(state) (((state) & Mod3Mask) != 0) +#define IsMod4(state) (((state) & Mod4Mask) != 0) +#define IsMod5(state) (((state) & Mod5Mask) != 0) + +/* + * key starts Thai compose sequence (Hex input method) if : + */ + +#define IsComposeKey(ks, event) \ + (( ks==XK_Alt_L && \ + IsControl((event)->state) && \ + !IsShift((event)->state)) \ + ? True : False) + + +/* + * State handler to implement the Thai hex input method. + */ + +Private int const nstate_handlers = 3; +Private StateProc state_handler[] = { + HexIMNormalKey, + HexIMFirstComposeKey, + HexIMSecondComposeKey +}; + + +/* + * Table for 'Thai Compose' character input. + * The current implementation uses latin-1 keysyms. + */ +struct _XMapThaiKey { + KeySym from; + KeySym to; +}; + +Private struct _XMapThaiKey const ThaiComposeTable[] = { + { /* 0xa4 */ XK_currency, /* 0xa5 */ XK_yen }, + { /* 0xa2 */ XK_cent, /* 0xa3 */ XK_sterling }, + { /* 0xe6 */ XK_ae, /* 0xef */ XK_idiaeresis }, + { /* 0xd3 */ XK_Oacute, /* 0xee */ XK_icircumflex }, + { /* 0xb9 */ XK_onesuperior, /* 0xfa */ XK_uacute }, + { /* 0xd2 */ XK_Ograve, /* 0xe5 */ XK_aring }, + { /* 0xbc */ XK_onequarter, /* 0xfb */ XK_ucircumflex }, + { XK_VoidSymbol, XK_VoidSymbol } +}; + +struct _XKeytrans { + struct _XKeytrans *next;/* next on list */ + char *string; /* string to return when the time comes */ + int len; /* length of string (since NULL is legit)*/ + KeySym key; /* keysym rebound */ + unsigned int state; /* modifier state */ + KeySym *modifiers; /* modifier keysyms you want */ + int mlen; /* length of modifier list */ +}; + + +/* Convert keysym to 'Thai Compose' keysym */ +/* The current implementation use latin-1 keysyms */ +Private Bool +ThaiComposeConvert( + Display *dpy, + KeySym insym, + KeySym *outsym, KeySym *lower, KeySym *upper) +{ + struct _XMapThaiKey const *table_entry = ThaiComposeTable; + + while (table_entry->from != XK_VoidSymbol) { + if (table_entry->from == insym) { + *outsym = table_entry->to; + *lower = *outsym; + *upper = *outsym; + return True; + } + table_entry++; + } + return False; +} + +Private int +XThaiTranslateKey( + register Display *dpy, + KeyCode keycode, + register unsigned int modifiers, + unsigned int *modifiers_return, + KeySym *keysym_return, + KeySym *lsym_return, + KeySym *usym_return) +{ + int per; + register KeySym *syms; + KeySym sym = 0, lsym = 0, usym = 0; + + if ((! dpy->keysyms) && (! _XKeyInitialize(dpy))) + return 0; + *modifiers_return = (ShiftMask|LockMask) | dpy->mode_switch; + if (((int)keycode < dpy->min_keycode) || ((int)keycode > dpy->max_keycode)) + { + *keysym_return = NoSymbol; + return 1; + } + per = dpy->keysyms_per_keycode; + syms = &dpy->keysyms[(keycode - dpy->min_keycode) * per]; + while ((per > 2) && (syms[per - 1] == NoSymbol)) + per--; + if ((per > 2) && (modifiers & dpy->mode_switch)) { + syms += 2; + per -= 2; + } + if (!(modifiers & ShiftMask) && + (!(modifiers & LockMask) || (dpy->lock_meaning == NoSymbol))) { + if ((per == 1) || (syms[1] == NoSymbol)) + XConvertCase(syms[0], keysym_return, &usym); + else { + XConvertCase(syms[0], &lsym, &usym); + *keysym_return = syms[0]; + } + } else if (!(modifiers & LockMask) || + (dpy->lock_meaning != XK_Caps_Lock)) { + if ((per == 1) || ((usym = syms[1]) == NoSymbol)) + XConvertCase(syms[0], &lsym, &usym); + *keysym_return = usym; + } else { + if ((per == 1) || ((sym = syms[1]) == NoSymbol)) + sym = syms[0]; + XConvertCase(sym, &lsym, &usym); + if (!(modifiers & ShiftMask) && (sym != syms[0]) && + ((sym != usym) || (lsym == usym))) + XConvertCase(syms[0], &lsym, &usym); + *keysym_return = usym; + } + /* + * ThaiCat keyboard support : + * When the Shift and Thai keys are hold for some keys a 'Thai Compose' + * character code is generated which is different from column 3 and + * 4 of the keymap. + * Since we don't know whether ThaiCat keyboard or WTT keyboard is + * in use, the same mapping is done for all Thai input. + * We just arbitary choose to use column 3 keysyms as the indices of + * this mapping. + * When the control key is also hold, this mapping has no effect. + */ + if ((modifiers & Mod1Mask) && + (modifiers & ShiftMask) && + !(modifiers & ControlMask)) { + if (ThaiComposeConvert(dpy, syms[0], &sym, &lsym, &usym)) + *keysym_return = sym; + } + + if (*keysym_return == XK_VoidSymbol) + *keysym_return = NoSymbol; + *lsym_return = lsym; + *usym_return = usym; + return 1; +} + +/* + * XThaiTranslateKeySym + * + * Translate KeySym to TACTIS code output. + * The current implementation uses ISO latin-1 keysym. + * Should be changed to TACTIS keysyms when they are defined by the + * standard. + */ +Private int +XThaiTranslateKeySym( + Display *dpy, + register KeySym symbol, + register KeySym lsym, + register KeySym usym, + unsigned int modifiers, + unsigned char *buffer, + int nbytes) +{ + KeySym ckey = 0; + register struct _XKeytrans *p; + int length; + unsigned long hiBytes; + register unsigned char c; + + /* + * initialize length = 1 ; + */ + length = 1; + + if (!symbol) + return 0; + /* see if symbol rebound, if so, return that string. */ + for (p = dpy->key_bindings; p; p = p->next) { + if (((modifiers & AllMods) == p->state) && (symbol == p->key)) { + length = p->len; + if (length > nbytes) length = nbytes; + memcpy (buffer, p->string, length); + return length; + } + } + /* try to convert to TACTIS, handling control */ + hiBytes = symbol >> 8; + if (!(nbytes && + ((hiBytes == 0) || + ((hiBytes == 0xFF) && + (((symbol >= XK_BackSpace) && (symbol <= XK_Clear)) || + (symbol == XK_Return) || + (symbol == XK_Escape) || + (symbol == XK_KP_Space) || + (symbol == XK_KP_Tab) || + (symbol == XK_KP_Enter) || + ((symbol >= XK_KP_Multiply) && (symbol <= XK_KP_9)) || + (symbol == XK_KP_Equal) || + (symbol == XK_Scroll_Lock) || +#ifdef DXK_PRIVATE /* DEC private keysyms */ + (symbol == DXK_Remove) || +#endif + (symbol == NoSymbol) || + (symbol == XK_Delete)))))) + return 0; + + /* if X keysym, convert to ascii by grabbing low 7 bits */ + if (symbol == XK_KP_Space) + c = XK_space & 0x7F; /* patch encoding botch */ +/* not for Thai + else if (symbol == XK_hyphen) + c = XK_minus & 0xFF; */ /* map to equiv character */ + else if (hiBytes == 0xFF) + c = symbol & 0x7F; + else + c = symbol & 0xFF; + /* only apply Control key if it makes sense, else ignore it */ + if (modifiers & ControlMask) { + if (!(IsKeypadKey(lsym) || lsym==XK_Return || lsym==XK_Tab)) { + if (IsISOControlKey(lsym)) ckey = lsym; + else if (IsISOControlKey(usym)) ckey = usym; + else if (lsym == XK_question) ckey = lsym; + else if (usym == XK_question) ckey = usym; + else if (IsValidControlKey(lsym)) ckey = lsym; + else if (IsValidControlKey(usym)) ckey = usym; + else length = 0; + + if (length != 0) { + if (ckey == XK_2) c = '\000'; + else if (ckey >= XK_3 && ckey <= XK_7) + c = (char)(ckey-('3'-'\033')); + else if (ckey == XK_8) c = '\177'; + else if (ckey == XK_Delete) c = '\030'; + else if (ckey == XK_question) c = '\037'; + else if (ckey == XK_quoteleft) c = '\036'; /* KLee 1/24/91 */ + else c = (char)(ckey & 0x1f); + } + } + } + /* + * ThaiCat has a key that generates two TACTIS codes D1 & E9. + * It is represented by the latin-1 keysym XK_thorn (0xfe). + * If c is XK_thorn, this key is pressed and it is converted to + * 0xd1 0xe9. + */ + if (c == XK_thorn) { + buffer[0] = 0xd1; + buffer[1] = 0xe9; + buffer[2] = '\0'; + return 2; + } + else { + /* Normal case */ + buffer[0] = c; + buffer[1] = '\0'; + return 1; + } +} + +/* + * given a KeySym, returns the first keycode containing it, if any. + */ +Private CARD8 +FindKeyCode( + register Display *dpy, + register KeySym code) +{ + + register KeySym *kmax = dpy->keysyms + + (dpy->max_keycode - dpy->min_keycode + 1) * dpy->keysyms_per_keycode; + register KeySym *k = dpy->keysyms; + while (k < kmax) { + if (*k == code) + return (((k - dpy->keysyms) / dpy->keysyms_per_keycode) + + dpy->min_keycode); + k += 1; + } + return 0; +} + +/* + * given a list of modifiers, computes the mask necessary for later matching. + * This routine must lookup the key in the Keymap and then search to see + * what modifier it is bound to, if any. Sets the AnyModifier bit if it + * can't map some keysym to a modifier. + */ +Private void +ComputeMaskFromKeytrans( + Display *dpy, + register struct _XKeytrans *p) +{ + register int i; + register CARD8 code; + register XModifierKeymap *m = dpy->modifiermap; + + p->state = AnyModifier; + for (i = 0; i < p->mlen; i++) { + /* if not found, then not on current keyboard */ + if ((code = FindKeyCode(dpy, p->modifiers[i])) == 0) + return; + /* code is now the keycode for the modifier you want */ + { + register int j = m->max_keypermod<<3; + + while ((--j >= 0) && (code != m->modifiermap[j])) + ; + if (j < 0) + return; + p->state |= (1<<(j/m->max_keypermod)); + } + } + p->state &= AllMods; +} + +/************************************************************************ + * + * + * Compose handling routines - compose handlers 0,1,2 + * + * + ************************************************************************/ + +#define NORMAL_KEY_STATE 0 +#define FIRST_COMPOSE_KEY_STATE 1 +#define SECOND_COMPOSE_KEY_STATE 2 + +Private +KeySym HexIMNormalKey( + XicThaiPart *thai_part, + KeySym symbol, + XKeyEvent *event) +{ + if (IsComposeKey (symbol, event)) /* start compose sequence */ + { + SetLed (event->display,COMPOSE_LED, LedModeOn); + thai_part->comp_state = FIRST_COMPOSE_KEY_STATE; + return NoSymbol; + } + return symbol; +} + + +Private +KeySym HexIMFirstComposeKey( + XicThaiPart *thai_part, + KeySym symbol, + XKeyEvent *event) +{ + if (IsModifierKey (symbol)) return symbol; /* ignore shift etc. */ + if (IsCancelComposeKey (&symbol, event)) /* cancel sequence */ + { + SetLed (event->display,COMPOSE_LED, LedModeOff); + thai_part->comp_state = NORMAL_KEY_STATE; + return symbol; + } + if (IsComposeKey (symbol, event)) /* restart sequence ?? */ + { + return NoSymbol; /* no state change necessary */ + } + + thai_part->keysym = symbol; /* save key pressed */ + thai_part->comp_state = SECOND_COMPOSE_KEY_STATE; + return NoSymbol; +} + +Private +KeySym HexIMSecondComposeKey( + XicThaiPart *thai_part, + KeySym symbol, + XKeyEvent *event) +{ + if (IsModifierKey (symbol)) return symbol; /* ignore shift etc. */ + if (IsComposeKey (symbol, event)) /* restart sequence ? */ + { + thai_part->comp_state =FIRST_COMPOSE_KEY_STATE; + return NoSymbol; + } + SetLed (event->display,COMPOSE_LED, LedModeOff); + if (IsCancelComposeKey (&symbol, event)) /* cancel sequence ? */ + { + thai_part->comp_state = NORMAL_KEY_STATE; + return symbol; + } + + if ((symbol = HexIMComposeSequence (thai_part->keysym, symbol)) + ==NoSymbol) + { /* invalid compose sequence */ + XBell(event->display, BellVolume); + } + thai_part->comp_state = NORMAL_KEY_STATE; /* reset to normal state */ + return symbol; +} + + +/* + * Interprets two keysyms entered as hex digits and return the Thai keysym + * correspond to the TACTIS code formed. + * The current implementation of this routine returns ISO Latin Keysyms. + */ + +Private +KeySym HexIMComposeSequence(KeySym ks1, KeySym ks2) +{ +int hi_digit; +int lo_digit; +int tactis_code; + + if ((ks1 >= XK_0) && (ks1 <= XK_9)) + hi_digit = ks1 - XK_0; + else if ((ks1 >= XK_A) && (ks1 <= XK_F)) + hi_digit = ks1 - XK_A + 10; + else if ((ks1 >= XK_a) && (ks1 <= XK_f)) + hi_digit = ks1 - XK_a + 10; + else /* out of range */ + return NoSymbol; + + if ((ks2 >= XK_0) && (ks2 <= XK_9)) + lo_digit = ks2 - XK_0; + else if ((ks2 >= XK_A) && (ks2 <= XK_F)) + lo_digit = ks2 - XK_A + 10; + else if ((ks2 >= XK_a) && (ks2 <= XK_f)) + lo_digit = ks2 - XK_a + 10; + else /* out of range */ + return NoSymbol; + + tactis_code = hi_digit * 0x10 + lo_digit ; + + return (KeySym)tactis_code; + +} + +/* + * routine determines + * 1) whether key event should cancel a compose sequence + * 2) whether cancelling key event should be processed or ignored + */ + +Private +int IsCancelComposeKey( + KeySym *symbol, + XKeyEvent *event) +{ + if (*symbol==XK_Delete && !IsControl(event->state) && + !IsMod1(event->state)) { + *symbol=NoSymbol; /* cancel compose sequence, and ignore key */ + return True; + } + if (IsComposeKey(*symbol, event)) return False; + return ( + IsControl (event->state) || + IsMod1(event->state) || + IsKeypadKey (*symbol) || + IsFunctionKey (*symbol) || + IsMiscFunctionKey (*symbol) || +#ifdef DXK_PRIVATE /* DEC private keysyms */ + *symbol == DXK_Remove || +#endif + IsPFKey (*symbol) || + IsCursorKey (*symbol) || + (*symbol >= XK_Tab && *symbol < XK_Multi_key) + ? True : False); /* cancel compose sequence and pass */ + /* cancelling key through */ +} + + +/* + * set specified keyboard LED on or off + */ + +Private +void SetLed( + Display *dpy, + int num, + int state) +{ + XKeyboardControl led_control; + + led_control.led_mode = state; + led_control.led = num; + XChangeKeyboardControl (dpy, KBLed | KBLedMode, &led_control); +} +#endif + +/* + * Initialize ISC mode from im modifier + */ +Private void InitIscMode(Xic ic) +{ + Xim im; + char *im_modifier_name; + + /* If already defined, just return */ + + if (IC_IscMode(ic)) return; + + /* Get IM modifier */ + + im = (Xim) XIMOfIC((XIC)ic); + im_modifier_name = im->core.im_name; + + /* Match with predefined value, default is Basic Check */ + + if (!strncmp(im_modifier_name,"BasicCheck",MAXTHAIIMMODLEN+1)) + IC_IscMode(ic) = WTT_ISC1; + else if (!strncmp(im_modifier_name,"Strict",MAXTHAIIMMODLEN+1)) + IC_IscMode(ic) = WTT_ISC2; + else if (!strncmp(im_modifier_name,"Thaicat",MAXTHAIIMMODLEN+1)) + IC_IscMode(ic) = THAICAT_ISC; + else if (!strncmp(im_modifier_name,"Passthrough",MAXTHAIIMMODLEN+1)) + IC_IscMode(ic) = NOISC; + else + IC_IscMode(ic) = WTT_ISC1; + + return; +} + +/* + * Helper functions for _XimThaiFilter() + */ +Private Bool +ThaiFltAcceptInput(Xic ic, unsigned char new_char, KeySym symbol) +{ + DefTreeBase *b = &ic->private.local.base; + b->wc[b->tree[ic->private.local.composed].wc+0] = tis2ucs(new_char); + b->wc[b->tree[ic->private.local.composed].wc+1] = '\0'; + + if ((new_char <= 0x1f) || (new_char == 0x7f)) + b->tree[ic->private.local.composed].keysym = symbol; + else + b->tree[ic->private.local.composed].keysym = NoSymbol; + + return True; +} + +Private Bool +ThaiFltReorderInput(Xic ic, unsigned char previous_char, unsigned char new_char) +{ + DefTreeBase *b = &ic->private.local.base; + if (!IC_DeletePreviousChar(ic)) return False; + b->wc[b->tree[ic->private.local.composed].wc+0] = tis2ucs(new_char); + b->wc[b->tree[ic->private.local.composed].wc+1] = tis2ucs(previous_char); + b->wc[b->tree[ic->private.local.composed].wc+2] = '\0'; + + b->tree[ic->private.local.composed].keysym = NoSymbol; + + return True; +} + +Private Bool +ThaiFltReplaceInput(Xic ic, unsigned char new_char, KeySym symbol) +{ + DefTreeBase *b = &ic->private.local.base; + if (!IC_DeletePreviousChar(ic)) return False; + b->wc[b->tree[ic->private.local.composed].wc+0] = tis2ucs(new_char); + b->wc[b->tree[ic->private.local.composed].wc+1] = '\0'; + + if ((new_char <= 0x1f) || (new_char == 0x7f)) + b->tree[ic->private.local.composed].keysym = symbol; + else + b->tree[ic->private.local.composed].keysym = NoSymbol; + + return True; +} + +/* + * Filter function for TACTIS + */ +Bool +_XimThaiFilter(d, w, ev, client_data) +Display *d; +Window w; +XEvent *ev; +XPointer client_data; +{ + Xic ic = (Xic)client_data; + KeySym symbol; + int isc_mode; /* Thai Input Sequence Check mode */ + unsigned char previous_char; /* Last inputted Thai char */ + unsigned char new_char; +#ifdef UNUSED + unsigned int modifiers; + KeySym lsym,usym; + int state; + XicThaiPart *thai_part; + char buf[10]; +#endif + wchar_t wbuf[10]; + Bool isReject; + DefTreeBase *b = &ic->private.local.base; + + if ((ev->type != KeyPress) + || (ev->xkey.keycode == 0)) + return False; + + if (!IC_IscMode(ic)) InitIscMode(ic); + + XwcLookupString((XIC)ic, &ev->xkey, wbuf, sizeof(wbuf) / sizeof(wbuf[0]), + &symbol, NULL); + + if ((ev->xkey.state & (AllMods & ~ShiftMask)) || + ((symbol >> 8 == 0xFF) && + ((XK_BackSpace <= symbol && symbol <= XK_Clear) || + (symbol == XK_Return) || + (symbol == XK_Pause) || + (symbol == XK_Scroll_Lock) || + (symbol == XK_Sys_Req) || + (symbol == XK_Escape) || + (symbol == XK_Delete) || + IsCursorKey(symbol) || + IsKeypadKey(symbol) || + IsMiscFunctionKey(symbol) || + IsFunctionKey(symbol)))) + { + IC_ClearPreviousChar(ic); + return False; + } + if (((symbol >> 8 == 0xFF) && + IsModifierKey(symbol)) || +#ifdef XK_XKB_KEYS + ((symbol >> 8 == 0xFE) && + (XK_ISO_Lock <= symbol && symbol <= XK_ISO_Last_Group_Lock)) || +#endif + (symbol == NoSymbol)) + { + return False; + } +#ifdef UNUSED + if (! XThaiTranslateKey(ev->xkey.display, ev->xkey.keycode, ev->xkey.state, + &modifiers, &symbol, &lsym, &usym)) + return False; + + /* + * Hex input method processing + */ + + thai_part = &ic->private.local.thai; + state = thai_part->comp_state; + if (state >= 0 && state < nstate_handlers) /* call handler for state */ + { + symbol = (* state_handler[state])(thai_part, symbol, (XKeyEvent *)ev); + } + + /* + * Translate KeySym into mb. + */ + count = XThaiTranslateKeySym(ev->xkey.display, symbol, lsym, + usym, ev->xkey.state, buf, 10); + + if (!symbol && !count) + return True; + + /* Return symbol if cannot convert to character */ + if (!count) + return False; +#endif + + /* + * Thai Input sequence check + */ + isc_mode = IC_IscMode(ic); + if (!(previous_char = IC_GetPreviousChar(ic))) previous_char = ' '; + new_char = ucs2tis(wbuf[0]); + isReject = True; + if (THAI_isaccepted(new_char, previous_char, isc_mode)) { + ThaiFltAcceptInput(ic, new_char, symbol); + isReject = False; + } else { + unsigned char context_char; + + context_char = IC_GetContextChar(ic); + if (context_char) { + if (THAI_iscomposible(new_char, context_char)) { + if (THAI_iscomposible(previous_char, new_char)) { + isReject = !ThaiFltReorderInput(ic, previous_char, new_char); + } else if (THAI_iscomposible(previous_char, context_char)) { + isReject = !ThaiFltReplaceInput(ic, new_char, symbol); + } else if (THAI_chtype(previous_char) == FV1 + && THAI_chtype(new_char) == TONE) { + isReject = !ThaiFltReorderInput(ic, previous_char, new_char); + } + } else if (THAI_isaccepted(new_char, context_char, isc_mode)) { + isReject = !ThaiFltReplaceInput(ic, new_char, symbol); + } + } + } + if (isReject) { + /* reject character */ + XBell(ev->xkey.display, BellVolume); + return True; + } + + _Xlcwcstombs(ic->core.im->core.lcd, &b->mb[b->tree[ic->private.local.composed].mb], + &b->wc[b->tree[ic->private.local.composed].wc], 10); + + _Xlcmbstoutf8(ic->core.im->core.lcd, &b->utf8[b->tree[ic->private.local.composed].utf8], + &b->mb[b->tree[ic->private.local.composed].mb], 10); + + /* Remember the last character inputted + * (as fallback in case StringConversionCallback is not provided) + */ + IC_SavePreviousChar(ic, new_char); + + ev->xkey.keycode = 0; + XPutBackEvent(d, ev); + return True; +} |