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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) 1995-2024 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 <string.h>
#include "log.h"
#include "alert.h"
#include "cmd_queue.h"
#include "cmd_override.h"
#include "cmd_utils.h"
#include "brl_cmds.h"
#include "scr.h"
#include "prefs.h"
#include "core.h"
typedef struct {
int row;
struct {
int first;
int last;
} column;
} SelectionEndpoint;
typedef struct {
struct {
SelectionEndpoint start;
SelectionEndpoint end;
unsigned char started:1;
} selection;
} OverrideCommandData;
static int
getSelectionEndpoint (int arg, SelectionEndpoint *endpoint) {
return getCharacterCoordinates(arg, &endpoint->row, &endpoint->column.first, &endpoint->column.last, 0);
}
static int
compareSelectionEndpoints (const SelectionEndpoint *endpoint1, const SelectionEndpoint *endpoint2) {
if (endpoint1->row < endpoint2->row) return -1;
if (endpoint1->row > endpoint2->row) return 1;
if (endpoint1->column.first < endpoint2->column.first) return -1;
if (endpoint1->column.first > endpoint2->column.first) return 1;
return 0;
}
static int
setSelection (const SelectionEndpoint *start, const SelectionEndpoint *end, OverrideCommandData *ocd) {
{
const SelectionEndpoint *from = start;
const SelectionEndpoint *to = end;
if (compareSelectionEndpoints(from, to) > 0) {
const SelectionEndpoint *temp = from;
from = to;
to = temp;
}
if (!setScreenTextSelection(from->column.first, from->row, to->column.last, to->row)) {
return 0;
}
}
ocd->selection.start = *start;
ocd->selection.end = *end;
return 1;
}
static int
startSelection (const SelectionEndpoint *start, OverrideCommandData *ocd) {
return setSelection(start, start, ocd);
}
static int
handleOverrideCommands (int command, void *data) {
OverrideCommandData *ocd = data;
if (!scr.hasSelection) ocd->selection.started = 0;
switch (command & BRL_MSK_CMD) {
case BRL_CMD_TXTSEL_CLEAR: {
if (clearScreenTextSelection()) {
ocd->selection.started = 0;
} else {
alert(ALERT_COMMAND_REJECTED);
}
break;
}
default: {
int blk = command & BRL_MSK_BLK;
int arg = command & BRL_MSK_ARG;
int ext = BRL_CODE_GET(EXT, command);
switch (blk) {
case BRL_CMD_BLK(TXTSEL_SET): {
if (ext > arg) {
SelectionEndpoint start;
if (getSelectionEndpoint(arg, &start)) {
SelectionEndpoint end;
if (getSelectionEndpoint(ext, &end)) {
if (setSelection(&start, &end, ocd)) {
ocd->selection.started = 0;
break;
}
}
}
}
alert(ALERT_COMMAND_REJECTED);
break;
}
case BRL_CMD_BLK(TXTSEL_START): {
SelectionEndpoint start;
if (getSelectionEndpoint(arg, &start)) {
if (startSelection(&start, ocd)) {
ocd->selection.started = 1;
break;
}
}
alert(ALERT_COMMAND_REJECTED);
break;
}
case BRL_CMD_BLK(ROUTE): {
if (!ocd->selection.started && !prefs.startSelectionWithRoutingKey) return 0;
SelectionEndpoint endpoint;
if (getSelectionEndpoint(arg, &endpoint)) {
if (ocd->selection.started) {;
if (setSelection(&ocd->selection.start, &endpoint, ocd)) break;
} else if ((endpoint.row != scr.posy) || !((endpoint.column.first <= scr.posx) && (scr.posx <= endpoint.column.last))) {
return 0;
} else if (startSelection(&endpoint, ocd)) {
ocd->selection.started = 1;
break;
}
}
alert(ALERT_COMMAND_REJECTED);
break;
}
default:
return 0;
}
break;
}
}
return 1;
}
static void
destroyOverrideCommandData (void *data) {
OverrideCommandData *ocd = data;
free(ocd);
}
int
addOverrideCommands (void) {
OverrideCommandData *ocd;
if ((ocd = malloc(sizeof(*ocd)))) {
memset(ocd, 0, sizeof(*ocd));
ocd->selection.started = 0;
if (pushCommandHandler("override", KTB_CTX_DEFAULT,
handleOverrideCommands, destroyOverrideCommandData, ocd)) {
return 1;
}
free(ocd);
} else {
logMallocError();
}
return 0;
}
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