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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 <liblouis.h>
#include "log.h"
#include "ctb_translate.h"
#include "prefs.h"
static void
initialize (void) {
static unsigned char initialized = 0;
if (!initialized) {
int logLevel = LOG_INFO;
logMessage(logLevel, "LibLouis version: %s", lou_version());
logMessage(logLevel, "LibLouis Data Directory: %s", lou_getDataPath());
logMessage(logLevel, "LibLouis Character Size: %d", lou_charSize());
initialized = 1;
}
}
static int
contractText_louis (BrailleContractionData *bcd) {
initialize();
int inputLength = getInputCount(bcd);
widechar inputBuffer[inputLength];
int outputOffsets[inputLength];
{
const wchar_t *source = bcd->input.begin;
widechar *target = inputBuffer;
while (source < bcd->input.end) {
*target++ = *source++;
}
}
int outputLength = getOutputCount(bcd);
widechar outputBuffer[outputLength];
int inputOffsets[outputLength];
int *cursor = NULL;
int position;
if (bcd->input.cursor) {
position = bcd->input.cursor - bcd->input.begin;
if ((position >= 0) && (position < inputLength)) cursor = &position;
}
int translationMode = dotsIO | ucBrl;
if (prefs.expandCurrentWord) translationMode |= compbrlAtCursor;
int translated = lou_translate(
bcd->table->data.louis.tableList,
inputBuffer, &inputLength, outputBuffer, &outputLength,
NULL /* typeForm */, NULL /* spacing */,
outputOffsets, inputOffsets, cursor, translationMode
);
if (translated) {
bcd->input.current = bcd->input.begin + inputLength;
bcd->output.current = bcd->output.begin + outputLength;
{
const widechar *source = outputBuffer;
BYTE *target = bcd->output.begin;
while (target < bcd->output.current) {
*target++ = *source++ & 0XFF;
}
}
if (bcd->input.offsets) {
const int *source = outputOffsets;
int *target = bcd->input.offsets;
const int *end = target + inputLength;
int previousOffset = -1;
while (target < end) {
int offset = *source++;
int same = offset == previousOffset;
*target++ = same? CTB_NO_OFFSET: offset;
previousOffset = offset;
}
end += bcd->input.end - bcd->input.current;
while (target < end) *target++ = CTB_NO_OFFSET;
}
}
return translated;
}
static void
finishCharacterEntry_louis (BrailleContractionData *bcd, CharacterEntry *entry) {
}
static const ContractionTableTranslationMethods louisTranslationMethods = {
.contractText = contractText_louis,
.finishCharacterEntry = finishCharacterEntry_louis
};
const ContractionTableTranslationMethods *
getContractionTableTranslationMethods_louis (void) {
return &louisTranslationMethods;
}
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