source: asp3_tinet_ecnl_rx/trunk/ntshell/ntshell/core/text_editor.c@ 337

Last change on this file since 337 was 337, checked in by coas-nagasima, 6 years ago

ASP3版ECNLを追加
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  • Property svn:mime-type set to text/x-csrc;charset=UTF-8
File size: 6.8 KB
Line 
1/**
2 * @file text_editor.c
3 * @author CuBeatSystems
4 * @author Shinichiro Nakamura
5 * @copyright
6 * ===============================================================
7 * Natural Tiny Shell (NT-Shell) Version 0.3.1
8 * ===============================================================
9 * Copyright (c) 2010-2016 Shinichiro Nakamura
10 *
11 * Permission is hereby granted, free of charge, to any person
12 * obtaining a copy of this software and associated documentation
13 * files (the "Software"), to deal in the Software without
14 * restriction, including without limitation the rights to use,
15 * copy, modify, merge, publish, distribute, sublicense, and/or
16 * sell copies of the Software, and to permit persons to whom the
17 * Software is furnished to do so, subject to the following
18 * conditions:
19 *
20 * The above copyright notice and this permission notice shall be
21 * included in all copies or substantial portions of the Software.
22 *
23 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
25 * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
27 * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
28 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
29 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
30 * OTHER DEALINGS IN THE SOFTWARE.
31 */
32
33#include "text_editor.h"
34
35/**
36 * @brief Initialize the text editor module.
37 *
38 * @param p A pointer to the text editor handler.
39 */
40void text_editor_init(text_editor_t *p)
41{
42 p->pos = 0;
43 p->len = 0;
44 p->buffer[p->len] = '\0';
45}
46
47/**
48 * @brief Insert a character.
49 *
50 * @param p A pointer to the text editor handler.
51 * @param c A character.
52 */
53int text_editor_insert(text_editor_t *p, unsigned int ch, char *utf8)
54{
55 int len;
56
57 if (ch < 0x80) {
58 utf8[0] = ch & 0x7F;
59 len = 1;
60 }
61 else if (ch < 0x00000800) {
62 utf8[1] = (0x80 | (ch & 0x3F));
63 utf8[0] = (0xC0 | (ch >> 6));
64 len = 2;
65 }
66 else if (ch < 0x00010000) {
67 utf8[2] = (0x80 | (ch & 0x3F));
68 utf8[1] = (0x80 | ((ch >> 6) & 0x3F));
69 utf8[0] = (0xE0 | (ch >> 12));
70 len = 3;
71 }
72 else if (ch < 0x00200000) {
73 utf8[3] = (0x80 | (ch & 0x3F));
74 utf8[2] = (0x80 | ((ch >> 6) & 0x3F));
75 utf8[1] = (0x80 | ((ch >> 12) & 0x3F));
76 utf8[0] = (0xF0 | (ch >> 18));
77 len = 4;
78 }
79 else if (ch < 0x04000000) {
80 utf8[4] = (0x80 | (ch & 0x3F));
81 utf8[3] = (0x80 | ((ch >> 6) & 0x3F));
82 utf8[2] = (0x80 | ((ch >> 12) & 0x3F));
83 utf8[1] = (0x80 | ((ch >> 18) & 0x3F));
84 utf8[0] = (0xF8 | (ch >> 24));
85 len = 5;
86 }
87 else if (ch < 0x80000000) {
88 utf8[5] = (0x80 | (ch & 0x3F));
89 utf8[4] = (0x80 | ((ch >> 6) & 0x3F));
90 utf8[3] = (0x80 | ((ch >> 12) & 0x3F));
91 utf8[2] = (0x80 | ((ch >> 18) & 0x3F));
92 utf8[1] = (0x80 | ((ch >> 24) & 0x3F));
93 utf8[0] = (0xFC | (ch >> 30));
94 len = 6;
95 }
96 else {
97 return 0;
98 }
99
100 if (p->len >= (int)sizeof(p->buffer) - len)
101 return 0;
102
103 int n = p->len - p->pos + len;
104 char *src = p->buffer + p->len + 0;
105 char *des = p->buffer + p->len + len;
106 for (int i = 0; i < n; i++) {
107 *des = *src;
108 des--;
109 src--;
110 }
111
112 for (int i = 0; i < len; i++) {
113 p->buffer[p->pos] = utf8[i];
114 p->pos++;
115 p->len++;
116 }
117 p->buffer[p->len] = '\0';
118 return len;
119}
120
121/**
122* @brief count bytes of a deleted character by backspace.
123*
124* @param str A pointer to the text.
125* @param pos The end of the text.
126*/
127int bs_char_count(char *str, int pos)
128{
129 int num = 1, local_pos = pos;
130 char *c;
131
132 while (1) {
133 c = str + local_pos;
134
135 if ((*c & 0x80) != 0x80)
136 return num;
137
138 if (((*c & 0xE0) == 0xC0) && (num == 2)) {
139 return num;
140 }
141 else if (((*c & 0xF0) == 0xE0) && (num == 3)) {
142 return num;
143 }
144 else if (((*c & 0xF8) == 0xF0) && (num == 4)) {
145 return num;
146 }
147 else if (((*c & 0xFC) == 0xF8) && (num == 5)) {
148 return num;
149 }
150 else if (((*c & 0xFE) == 0xFC) && (num == 6)) {
151 return num;
152 }
153 else {
154 if (local_pos > 0) {
155 local_pos--;
156 num++;
157 }
158 else
159 return 0;
160 }
161 }
162
163 return 0;
164}
165
166/**
167 * @brief Delete a character.
168 *
169 * @param p A pointer to the text editor handler.
170 */
171int text_editor_backspace(text_editor_t *p)
172{
173 int bs_char_num;
174
175 if (0 < p->pos) {
176 int n = p->len - p->pos;
177 int i;
178 char *src = p->buffer + p->pos - 0;
179 char *des = p->buffer + p->pos - 1;
180
181 bs_char_num = bs_char_count(p->buffer, p->pos - 1);
182 p->pos -= bs_char_num;
183 p->len -= bs_char_num;
184
185 for (i = 0; i < n; i++) {
186 *des = *src;
187 des++;
188 src++;
189 }
190 *(p->buffer + p->len) = '\0';
191 return (bs_char_num > 2 ? 2 : 1);
192 }
193 return 0;
194}
195
196/**
197 * @brief Delete a character.
198 *
199 * @param p A pointer to the text editor handler.
200 */
201int text_editor_delete(text_editor_t *p)
202{
203 if (p->pos < p->len) {
204 int n = p->len - p->pos - 1;
205 int i;
206 char *src = p->buffer + p->pos + 1;
207 char *des = p->buffer + p->pos + 0;
208 p->len--;
209 for (i = 0; i < n; i++) {
210 *des = *src;
211 des++;
212 src++;
213 }
214 *(p->buffer + p->len) = '\0';
215 return 1;
216 }
217 return 0;
218}
219
220/**
221 * @brief Get the cursor position.
222 *
223 * @param p A pointer to the text editor handler.
224 */
225int text_editor_cursor_get_position(text_editor_t *p)
226{
227 return p->pos;
228}
229
230/**
231 * @brief Move to the cursor to the head of the line.
232 *
233 * @param p A pointer to the text editor handler.
234 */
235int text_editor_cursor_head(text_editor_t *p)
236{
237 if (0 < p->pos) {
238 p->pos = 0;
239 return 1;
240 }
241 return 0;
242}
243
244/**
245 * @brief Move to the cursor to the tail of the line.
246 *
247 * @param p A pointer to the text editor handler.
248 */
249int text_editor_cursor_tail(text_editor_t *p)
250{
251 if (p->pos < p->len) {
252 p->pos = p->len;
253 return 1;
254 }
255 return 0;
256}
257
258/**
259 * @brief Move to the cursor to left.
260 *
261 * @param p A pointer to the text editor handler.
262 */
263int text_editor_cursor_left(text_editor_t *p)
264{
265 if (0 < p->pos) {
266 p->pos--;
267 return 1;
268 }
269 return 0;
270}
271
272/**
273 * @brief Move to the cursor to right.
274 *
275 * @param p A pointer to the text editor handler.
276 */
277int text_editor_cursor_right(text_editor_t *p)
278{
279 if (p->pos < p->len) {
280 p->pos++;
281 return 1;
282 }
283 return 0;
284}
285
286/**
287 * @brief Set the edit line.
288 *
289 * @param p A pointer to the text editor handler.
290 * @param buf A text string.
291 */
292int text_editor_set_text(text_editor_t *p, char *buf)
293{
294 char *src = buf;
295 char *des = p->buffer;
296 int n = 0;
297 while (*src) {
298 *des = *src;
299 des++;
300 src++;
301 n++;
302 if ((int)sizeof(p->buffer) <= n - 1) {
303 break;
304 }
305 }
306 *des = '\0';
307 p->len = n;
308 p->pos = p->len;
309 return n;
310}
311
312/**
313 * @brief Get the edit line.
314 *
315 * @param p A pointer to the text editor handler.
316 * @param buf A text string.
317 * @param siz Size of the text string buffer.
318 */
319int text_editor_get_text(text_editor_t *p, char *buf, int siz)
320{
321 char *src = p->buffer;
322 char *des = buf;
323 int n = 0;
324 while (*src) {
325 *des++ = *src++;
326 n++;
327 if (siz <= n) {
328 break;
329 }
330 }
331 *des = '\0';
332 return n;
333}
334
335/**
336 * @brief Clear the text string.
337 *
338 * @param p A pointer to the text editor handler.
339 */
340void text_editor_clear(text_editor_t *p)
341{
342 p->pos = 0;
343 p->len = 0;
344 p->buffer[p->len] = '\0';
345}
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