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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>.
*/
#ifndef BRLTTY_INCLUDED_CTB_TRANSLATE
#define BRLTTY_INCLUDED_CTB_TRANSLATE
#include "ctb.h"
#include "ctb_internal.h"
#include "prefs.h"
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
typedef struct {
ContractionTable *const table;
struct {
const wchar_t *begin;
const wchar_t *end;
const wchar_t *current;
const wchar_t *cursor;
int *offsets;
} input;
struct {
BYTE *begin;
BYTE *end;
BYTE *current;
} output;
struct {
const ContractionTableRule *rule;
ContractionTableOpcode opcode;
int length;
wchar_t before;
wchar_t after;
} current;
struct {
ContractionTableOpcode opcode;
} previous;
} BrailleContractionData;
struct ContractionTableTranslationMethodsStruct {
int (*contractText) (BrailleContractionData *bcd);
void (*finishCharacterEntry) (BrailleContractionData *bcd, CharacterEntry *entry);
};
static inline unsigned int
getInputCount (BrailleContractionData *bcd) {
return bcd->input.end - bcd->input.begin;
}
static inline unsigned int
getInputConsumed (BrailleContractionData *bcd) {
return bcd->input.current - bcd->input.begin;
}
static inline unsigned int
getInputUnconsumed (BrailleContractionData *bcd) {
return bcd->input.end - bcd->input.current;
}
static inline unsigned int
getOutputCount (BrailleContractionData *bcd) {
return bcd->output.end - bcd->output.begin;
}
static inline unsigned int
getOutputConsumed (BrailleContractionData *bcd) {
return bcd->output.current - bcd->output.begin;
}
static inline void
assignOffset (BrailleContractionData *bcd, int value) {
if (bcd->input.offsets) {
bcd->input.offsets[getInputConsumed(bcd)] = value;
}
}
static inline void
setOffset (BrailleContractionData *bcd) {
assignOffset(bcd, getOutputConsumed(bcd));
}
static inline void
clearOffset (BrailleContractionData *bcd) {
assignOffset(bcd, CTB_NO_OFFSET);
}
extern const CharacterEntry *getCharacterEntry (BrailleContractionData *bcd, wchar_t character);
extern const CharacterEntry *findCharacterEntry (BrailleContractionData *bcd, wchar_t character, unsigned int *position);
static inline int
testCharacter (BrailleContractionData *bcd, wchar_t character, ContractionTableCharacterAttributes attributes) {
const CharacterEntry *entry = getCharacterEntry(bcd, character);
return entry && (attributes & entry->attributes);
}
static inline int
testRelative (BrailleContractionData *bcd, int offset, ContractionTableCharacterAttributes attributes) {
return testCharacter(bcd, bcd->input.current[offset], attributes);
}
static inline int
testCurrent (BrailleContractionData *bcd, ContractionTableCharacterAttributes attributes) {
return testRelative(bcd, 0, attributes);
}
static inline int
testPrevious (BrailleContractionData *bcd, ContractionTableCharacterAttributes attributes) {
return testRelative(bcd, -1, attributes);
}
static inline int
testNext (BrailleContractionData *bcd, ContractionTableCharacterAttributes attributes) {
return testRelative(bcd, 1, attributes);
}
static inline int
testBefore (BrailleContractionData *bcd, ContractionTableCharacterAttributes attributes) {
return testCharacter(bcd, bcd->current.before, attributes);
}
static inline int
testAfter (BrailleContractionData *bcd, ContractionTableCharacterAttributes attributes) {
return testCharacter(bcd, bcd->current.after, attributes);
}
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* BRLTTY_INCLUDED_CTB_TRANSLATE */
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