mirror of
https://github.com/lvgl/lvgl.git
synced 2025-01-28 07:03:00 +08:00
create lv_bidi.c/h
This commit is contained in:
Gabor Kiss-Vamosi
parent
7ef624054a
commit
3dfbc5c85d
221
src/lv_misc/lv_bidi.c
Normal file
221
src/lv_misc/lv_bidi.c
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@ -0,0 +1,221 @@
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/**
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* @file lv_bidi.c
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*
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*/
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/*********************
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* INCLUDES
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*********************/
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#include "lv_bidi.h"
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#include <stddef.h>
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#include "lv_txt.h"
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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/**********************
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* STATIC PROTOTYPES
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**********************/
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static lv_bidi_dir_t get_next_run(const char * txt, lv_bidi_dir_t base_dir, uint32_t * len);
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static void rtl_reverse(char * dest, const char * src, uint32_t len);
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/**********************
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* STATIC VARIABLES
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**********************/
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/**********************
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* MACROS
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**********************/
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/**********************
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* GLOBAL FUNCTIONS
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**********************/
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void lv_bidi_process(const char * str_in, char * str_out, lv_bidi_dir_t base_dir)
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{
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uint32_t run_len = 0;
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lv_bidi_dir_t run_dir;
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uint32_t rd = 0;
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lv_bidi_dir_t dir = base_dir;
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/*Process neutral chars in the beginning*/
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while(str_in[rd] != '\0') {
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uint32_t letter = lv_txt_encoded_next(str_in, &rd);
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dir = lv_bidi_get_letter_dir(letter);
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if(dir != LV_BIDI_DIR_NEUTRAL) break;
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}
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/*if there were neutrals in the beginning apply `base_dir` on them */
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if(rd && str_in[rd] != '\0') lv_txt_encoded_prev(str_in, &rd);
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if(rd) {
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memcpy(str_out, str_in, rd);
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str_out[rd] = '\0';
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printf("%s: \"%s\"\n", base_dir == LV_BIDI_DIR_LTR ? "LTR" : "RTL", str_out);
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}
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/*Get and process the runs*/
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while(str_in[rd] != '\0') {
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run_dir = get_next_run(&str_in[rd], base_dir, &run_len);
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memcpy(str_out, &str_in[rd], run_len);
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str_out[run_len] = '\0';
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if(run_dir == LV_BIDI_DIR_LTR) {
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printf("%s: \"%s\"\n", "LTR" , str_out);
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} else {
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printf("%s: \"%s\" -> ", "RTL" , str_out);
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rtl_reverse(str_out, &str_in[rd], run_len);
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printf("\"%s\"\n", str_out);
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}
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rd += run_len;
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}
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}
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lv_bidi_dir_t lv_bidi_get_letter_dir(uint32_t letter)
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{
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if(lv_bidi_letter_is_rtl(letter)) return LV_BIDI_DIR_RTL;
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if(lv_bidi_letter_is_neutral(letter)) return LV_BIDI_DIR_NEUTRAL;
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if(lv_bidi_letter_is_weak(letter)) return LV_BIDI_DIR_WEAK;
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return LV_BIDI_DIR_LTR;
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}
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bool lv_bidi_letter_is_weak(uint32_t letter)
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{
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uint32_t i = 0;
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static const char weaks[] = "0123456789";
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do {
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uint32_t x = lv_txt_encoded_next(weaks, &i);
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if(letter == x) {
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return true;
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}
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} while(weaks[i] != '\0');
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return false;
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}
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bool lv_bidi_letter_is_rtl(uint32_t letter)
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{
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if(letter >= 'a' && letter <= 'z') return true;
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return false;
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}
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bool lv_bidi_letter_is_neutral(uint32_t letter)
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{
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uint16_t i;
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static const char neutrals[] = " \t\n\r.,:;'\"`!?%/\\=()[]{}<>@#&|";
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for(i = 0; neutrals[i] != '\0'; i++) {
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if(letter == (uint32_t)neutrals[i]) return true;
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}
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return false;
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}
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/**********************
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* STATIC FUNCTIONS
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**********************/
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static lv_bidi_dir_t get_next_run(const char * txt, lv_bidi_dir_t base_dir, uint32_t * len)
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{
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uint32_t i = 0;
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uint32_t letter;
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letter = lv_txt_encoded_next(txt, NULL);
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lv_bidi_dir_t dir = lv_bidi_get_letter_dir(letter);
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/*Find the first strong char. Skip the neutrals.*/
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while(dir == LV_BIDI_DIR_NEUTRAL || dir == LV_BIDI_DIR_WEAK) {
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letter = lv_txt_encoded_next(txt, &i);
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dir = lv_bidi_get_letter_dir(letter);
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if(txt[i] == '\0') {
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*len = i;
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return base_dir;
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}
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}
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lv_bidi_dir_t run_dir = dir;
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uint32_t i_prev = i;
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uint32_t i_last_strong = i;
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/*Find the next char which has different direction*/
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lv_bidi_dir_t next_dir = base_dir;
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while(txt[i] != '\0') {
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letter = lv_txt_encoded_next(txt, &i);
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next_dir = lv_bidi_get_letter_dir(letter);
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/*New dir found?*/
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if((next_dir == LV_BIDI_DIR_RTL || next_dir == LV_BIDI_DIR_LTR) && next_dir != run_dir) {
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/*Include neutrals if `run_dir == base_dir` */
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if(run_dir == base_dir) *len = i_prev;
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/*Exclude neutrals if `run_dir != base_dir` */
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else *len = i_last_strong;
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return run_dir;
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}
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if(next_dir != LV_BIDI_DIR_NEUTRAL) i_last_strong = i;
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i_prev = i;
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}
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/*Handle end of of string. Apply `base_dir` on trailing neutrals*/
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/*Include neutrals if `run_dir == base_dir` */
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if(run_dir == base_dir) *len = i_prev;
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/*Exclude neutrals if `run_dir != base_dir` */
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else *len = i_last_strong;
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return run_dir;
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}
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static void rtl_reverse(char * dest, const char * src, uint32_t len)
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{
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uint32_t i = len;
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uint32_t wr = 0;
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while(i) {
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uint32_t letter = lv_txt_encoded_prev(src, &i);
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/*Keep weak letters as LTR*/
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if(lv_bidi_letter_is_weak(letter)) {
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uint32_t last_weak = i;
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uint32_t first_weak = i;
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while(i) {
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letter = lv_txt_encoded_prev(src, &i);
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if(lv_bidi_letter_is_weak(letter) == false) {
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lv_txt_encoded_next(src, &i); /*Rewind one letter*/
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first_weak = i;
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break;
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}
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}
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if(i == 0) first_weak = 0;
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memcpy(&dest[wr], &src[first_weak], last_weak - first_weak + 1);
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wr += last_weak - first_weak + 1;
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}
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/*Simply store in reversed order*/
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else {
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uint32_t letter_size = lv_txt_encoded_size((const char *)&letter);
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memcpy(&dest[wr], &src[i], letter_size);
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wr += letter_size;
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}
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}
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}
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52
src/lv_misc/lv_bidi.h
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52
src/lv_misc/lv_bidi.h
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@ -0,0 +1,52 @@
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/**
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* @file lv_bifi.h
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*
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*/
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#ifndef LV_BIDI_H
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#define LV_BIDI_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*********************
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* INCLUDES
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*********************/
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#include <stdbool.h>
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#include <stdint.h>
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/*********************
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* DEFINES
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*********************/
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/**********************
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* TYPEDEFS
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**********************/
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typedef enum
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{
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LV_BIDI_DIR_LTR,
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LV_BIDI_DIR_RTL,
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LV_BIDI_DIR_NEUTRAL,
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LV_BIDI_DIR_WEAK,
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}lv_bidi_dir_t;
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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void lv_bidi_process(const char * str_in, char * str_out, lv_bidi_dir_t base_dir);
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lv_bidi_dir_t lv_bidi_get_letter_dir(uint32_t letter);
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bool lv_bidi_letter_is_weak(uint32_t letter);
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bool lv_bidi_letter_is_rtl(uint32_t letter);
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bool lv_bidi_letter_is_neutral(uint32_t letter);
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/**********************
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* MACROS
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**********************/
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#ifdef __cplusplus
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} /* extern "C" */
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#endif
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#endif /*LV_BIDI_H*/
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@ -346,123 +346,6 @@ void lv_txt_cut(char * txt, uint32_t pos, uint32_t len)
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}
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}
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lv_txt_dir_t lv_txt_get_letter_dir(uint32_t letter)
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{
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if(letter >= 'a' && letter <= 'z') return LV_TXT_DIR_RTL;
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uint16_t i;
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static const char neutrals[] = " \t\n\r.,:;'\"`!?%/\\=()[]{}<>@#&|";
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for(i = 0; neutrals[i] != '\0'; i++) {
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if(letter == neutrals[i]) return LV_TXT_DIR_NEUTRAL;
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}
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static const char weaks[] = "0123456789";
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for(i = 0; weaks[i] != '\0'; i++) {
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if(letter == weaks[i]) return LV_TXT_DIR_WEAK;
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}
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return LV_TXT_DIR_LTR;
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}
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lv_txt_dir_t lv_txt_rtl_next_run(const char * txt, lv_txt_dir_t base_dir, uint32_t * len)
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{
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uint32_t i = 0;
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uint32_t letter;
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letter = lv_txt_encoded_next(txt, NULL);
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lv_txt_dir_t dir = lv_txt_get_letter_dir(letter);
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/*Find the first strong char. Skip the neutrals.*/
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while(dir == LV_TXT_DIR_NEUTRAL || dir == LV_TXT_DIR_WEAK) {
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letter = lv_txt_encoded_next(txt, &i);
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dir = lv_txt_get_letter_dir(letter);
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if(txt[i] == '\0') {
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*len = i;
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return base_dir;
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}
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}
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lv_txt_dir_t run_dir = dir;
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uint32_t i_prev = i;
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uint32_t i_last_strong = i;
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/*Find the next char which has different direction*/
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lv_txt_dir_t next_dir = base_dir;
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while(txt[i] != '\0') {
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letter = lv_txt_encoded_next(txt, &i);
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next_dir = lv_txt_get_letter_dir(letter);
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/*New dir found?*/
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if((next_dir == LV_TXT_DIR_RTL || next_dir == LV_TXT_DIR_LTR) && next_dir != run_dir) {
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/*Include neutrals if `run_dir == base_dir` */
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if(run_dir == base_dir) *len = i_prev;
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/*Exclude neutrals if `run_dir != base_dir` */
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else *len = i_last_strong;
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return run_dir;
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}
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if(next_dir != LV_TXT_DIR_NEUTRAL) i_last_strong = i;
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i_prev = i;
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}
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/*Handle end of of string. Apply `base_dir` on trailing neutrals*/
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/*Include neutrals if `run_dir == base_dir` */
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if(run_dir == base_dir) *len = i_prev;
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/*Exclude neutrals if `run_dir != base_dir` */
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else *len = i_last_strong;
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return run_dir;
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}
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bool lv_txt_rtl_proc(const char * str_in, char * str_out, lv_txt_dir_t base_dir)
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{
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uint32_t run_len = 0;
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lv_txt_dir_t run_dir;
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uint32_t rd = 0;
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lv_txt_dir_t dir = base_dir;
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/*Process neutral chars in the beginning*/
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while(str_in[rd] != '\0') {
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uint32_t letter = lv_txt_encoded_next(str_in, &rd);
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dir = lv_txt_get_letter_dir(letter);
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if(dir != LV_TXT_DIR_NEUTRAL) break;
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}
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/*if there were neutrals in the beginning apply `base_dir` on them */
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if(rd && str_in[rd] != '\0') lv_txt_encoded_prev(str_in, &rd);
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if(rd) {
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memcpy(str_out, str_in, rd);
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str_out[rd] = '\0';
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printf("%s: \"%s\"\n", base_dir == LV_TXT_DIR_LTR ? "LTR" : "RTL", str_out);
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}
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/*Get and process the runs*/
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while(str_in[rd] != '\0') {
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run_dir = lv_txt_rtl_next_run(&str_in[rd], base_dir, &run_len);
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memcpy(str_out, &str_in[rd], run_len);
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str_out[run_len] = '\0';
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printf("%s: \"%s\"\n", run_dir == LV_TXT_DIR_LTR ? "LTR" : "RTL", str_out);
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rd += run_len;
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}
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return true;
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}
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#if LV_TXT_ENC == LV_TXT_ENC_UTF8
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/*******************************
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* UTF-8 ENCODER/DECOER
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@ -56,15 +56,6 @@ enum {
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};
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typedef uint8_t lv_txt_cmd_state_t;
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typedef enum
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{
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LV_TXT_DIR_LTR,
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LV_TXT_DIR_RTL,
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LV_TXT_DIR_NEUTRAL,
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LV_TXT_DIR_WEAK,
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}lv_txt_dir_t;
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/**********************
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* GLOBAL PROTOTYPES
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**********************/
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@ -137,9 +128,6 @@ void lv_txt_ins(char * txt_buf, uint32_t pos, const char * ins_txt);
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*/
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void lv_txt_cut(char * txt, uint32_t pos, uint32_t len);
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bool lv_txt_rtl_proc(const char * str_in, char * str_out, lv_txt_dir_t base_dir);
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/***************************************************************
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* GLOBAL FUNCTION POINTERS FOR CAHRACTER ENCODING INTERFACE
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***************************************************************/
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