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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2025 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include "ttb.h"
#include "ttb_internal.h"
#include "ttb_compile.h"
static int
getUnicodeCharacters (DataFile *file, wchar_t *character, int num, const char *description) {
DataOperand string;
const wchar_t *c;
int i;
if (getDataOperand(file, &string, description)) {
for (c = string.characters, i = 0; i < num; i++) {
if (*c == '\\') {
c++;
switch (*c) {
case WC_C('\\'): character[i] = WC_C('\\'); continue;
case WC_C('f'): case WC_C('F'): character[i] = WC_C('\f'); continue;
case WC_C('n'): case WC_C('N'): character[i] = WC_C('\n'); continue;
case WC_C('r'): case WC_C('R'): character[i] = WC_C('\r'); continue;
case WC_C('s'): case WC_C('S'): character[i] = WC_C(' ' ); continue;
case WC_C('t'): case WC_C('T'): character[i] = WC_C('\t'); continue;
case WC_C('v'): case WC_C('V'): character[i] = WC_C('\v'); continue;
case WC_C('x'): case WC_C('X'): {
const wchar_t *digit = ++c;
int length = string.length - (digit - string.characters);
character[i] = 0;
while (length) {
int value;
int shift;
if (!isHexadecimalDigit(*digit, &value, &shift)) break;
digit++;
character[i] <<= shift;
character[i] |= value;
length -= 1;
}
if (digit == c) goto invalid;
c = digit;
continue;
}
default:
invalid:
reportDataError(file, "unknown escape sequence: %.*" PRIws,
(int)(c-string.characters+1), string.characters);
}
} else {
character[i] = *c++;
}
}
return 1;
}
return 0;
}
static int
getDots (DataFile *file, unsigned char *dots, const char *description) {
DataOperand string;
int i;
*dots = 0;
if (getDataOperand(file, &string, description)) {
for (i = 0; i < string.length; i++) {
if (string.characters[i] >= WC_C('1') && string.characters[i] <= WC_C('8')) {
*dots |= 1 << (string.characters[i] - WC_C('1'));
} else if (string.characters[i] == WC_C('-')) {
reportDataError(file, "no support for multi-cell %.*" PRIws,
string.length, string.characters);
return 0;
}
}
}
return 1;
}
static DATA_OPERANDS_PROCESSOR(processChar) {
TextTableData *ttd = data;
wchar_t character;
if (getUnicodeCharacters(file, &character, 1, "character")) {
unsigned char dots;
if (getDots(file, &dots, "braille representation")) {
if (!setTextTableCharacter(ttd, character, dots)) return 0;
}
}
return 1;
}
static DATA_OPERANDS_PROCESSOR(processUplow) {
TextTableData *ttd = data;
wchar_t characters[2];
if (getUnicodeCharacters(file, characters, 2, "characters")) {
unsigned char dots;
if (getDots(file, &dots, "braille representation")) {
if (!setTextTableCharacter(ttd, characters[0], dots)) return 0;
if (!setTextTableCharacter(ttd, characters[1], dots)) return 0;
}
}
return 1;
}
static DATA_OPERANDS_PROCESSOR(processInclude) {
reportDataError(file, "no support for include");
return 1;
}
static DATA_OPERANDS_PROCESSOR(processLibLouisOperands) {
BEGIN_DATA_DIRECTIVE_TABLE
{.name=WS_C("space"), .processor=processChar},
{.name=WS_C("punctuation"), .processor=processChar},
{.name=WS_C("digit"), .processor=processChar},
{.name=WS_C("uplow"), .processor=processUplow},
{.name=WS_C("letter"), .processor=processChar},
{.name=WS_C("lowercase"), .processor=processChar},
{.name=WS_C("uppercase"), .processor=processChar},
{.name=WS_C("litdigit"), .processor=processChar},
{.name=WS_C("sign"), .processor=processChar},
{.name=WS_C("math"), .processor=processChar},
{.name=WS_C("decpoint"), .processor=processChar},
{.name=WS_C("hyphen"), .processor=processChar},
{.name=WS_C("include"), .processor=processInclude},
END_DATA_DIRECTIVE_TABLE
return processDirectiveOperand(file, &directives, "lib louis directive", data);
}
TextTableData *
processLibLouisStream (FILE *stream, const char *name) {
return processTextTableLines(stream, name, processLibLouisOperands);
}
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