[352] | 1 | /**
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| 2 | * @file text_editor.c
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| 3 | * @author CuBeatSystems
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| 4 | * @author Shinichiro Nakamura
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| 5 | * @copyright
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| 6 | * ===============================================================
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| 7 | * Natural Tiny Shell (NT-Shell) Version 0.3.1
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| 8 | * ===============================================================
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| 9 | * Copyright (c) 2010-2016 Shinichiro Nakamura
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| 10 | *
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| 11 | * Permission is hereby granted, free of charge, to any person
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| 12 | * obtaining a copy of this software and associated documentation
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| 13 | * files (the "Software"), to deal in the Software without
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| 14 | * restriction, including without limitation the rights to use,
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| 15 | * copy, modify, merge, publish, distribute, sublicense, and/or
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| 16 | * sell copies of the Software, and to permit persons to whom the
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| 17 | * Software is furnished to do so, subject to the following
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| 18 | * conditions:
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| 19 | *
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| 20 | * The above copyright notice and this permission notice shall be
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| 21 | * included in all copies or substantial portions of the Software.
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| 22 | *
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| 23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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| 24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
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| 25 | * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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| 26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
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| 27 | * HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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| 28 | * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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| 29 | * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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| 30 | * OTHER DEALINGS IN THE SOFTWARE.
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| 31 | */
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| 32 |
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| 33 | #include "text_editor.h"
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| 34 |
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| 35 | /**
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| 36 | * @brief Initialize the text editor module.
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| 37 | *
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| 38 | * @param p A pointer to the text editor handler.
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| 39 | */
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| 40 | void text_editor_init(text_editor_t *p)
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| 41 | {
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| 42 | p->pos = 0;
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| 43 | p->len = 0;
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| 44 | p->buffer[p->len] = '\0';
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| 45 | }
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| 46 |
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| 47 | /**
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| 48 | * @brief Insert a character.
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| 49 | *
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| 50 | * @param p A pointer to the text editor handler.
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| 51 | * @param c A character.
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| 52 | */
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| 53 | int text_editor_insert(text_editor_t *p, unsigned int ch, char *utf8)
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| 54 | {
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| 55 | int len;
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| 56 |
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| 57 | if (ch < 0x80) {
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| 58 | utf8[0] = ch & 0x7F;
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| 59 | len = 1;
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| 60 | }
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| 61 | else if (ch < 0x00000800) {
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| 62 | utf8[1] = (0x80 | (ch & 0x3F));
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| 63 | utf8[0] = (0xC0 | (ch >> 6));
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| 64 | len = 2;
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| 65 | }
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| 66 | else if (ch < 0x00010000) {
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| 67 | utf8[2] = (0x80 | (ch & 0x3F));
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| 68 | utf8[1] = (0x80 | ((ch >> 6) & 0x3F));
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| 69 | utf8[0] = (0xE0 | (ch >> 12));
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| 70 | len = 3;
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| 71 | }
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| 72 | else if (ch < 0x00200000) {
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| 73 | utf8[3] = (0x80 | (ch & 0x3F));
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| 74 | utf8[2] = (0x80 | ((ch >> 6) & 0x3F));
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| 75 | utf8[1] = (0x80 | ((ch >> 12) & 0x3F));
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| 76 | utf8[0] = (0xF0 | (ch >> 18));
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| 77 | len = 4;
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| 78 | }
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| 79 | else if (ch < 0x04000000) {
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| 80 | utf8[4] = (0x80 | (ch & 0x3F));
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| 81 | utf8[3] = (0x80 | ((ch >> 6) & 0x3F));
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| 82 | utf8[2] = (0x80 | ((ch >> 12) & 0x3F));
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| 83 | utf8[1] = (0x80 | ((ch >> 18) & 0x3F));
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| 84 | utf8[0] = (0xF8 | (ch >> 24));
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| 85 | len = 5;
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| 86 | }
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| 87 | else if (ch < 0x80000000) {
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| 88 | utf8[5] = (0x80 | (ch & 0x3F));
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| 89 | utf8[4] = (0x80 | ((ch >> 6) & 0x3F));
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| 90 | utf8[3] = (0x80 | ((ch >> 12) & 0x3F));
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| 91 | utf8[2] = (0x80 | ((ch >> 18) & 0x3F));
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| 92 | utf8[1] = (0x80 | ((ch >> 24) & 0x3F));
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| 93 | utf8[0] = (0xFC | (ch >> 30));
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| 94 | len = 6;
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| 95 | }
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| 96 | else {
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| 97 | return 0;
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| 98 | }
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| 99 |
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| 100 | if (p->len >= (int)sizeof(p->buffer) - len)
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| 101 | return 0;
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| 102 |
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| 103 | int n = p->len - p->pos + len;
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| 104 | char *src = p->buffer + p->len + 0;
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| 105 | char *des = p->buffer + p->len + len;
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| 106 | for (int i = 0; i < n; i++) {
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| 107 | *des = *src;
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| 108 | des--;
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| 109 | src--;
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| 110 | }
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| 111 |
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| 112 | for (int i = 0; i < len; i++) {
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| 113 | p->buffer[p->pos] = utf8[i];
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| 114 | p->pos++;
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| 115 | p->len++;
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| 116 | }
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| 117 | p->buffer[p->len] = '\0';
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| 118 | return len;
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| 119 | }
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| 120 |
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| 121 | /**
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| 122 | * @brief count bytes of a deleted character by backspace.
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| 123 | *
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| 124 | * @param str A pointer to the text.
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| 125 | * @param pos The end of the text.
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| 126 | */
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| 127 | int bs_char_count(char *str, int pos)
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| 128 | {
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| 129 | int num = 1, local_pos = pos;
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| 130 | char *c;
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| 131 |
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| 132 | while (1) {
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| 133 | c = str + local_pos;
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| 134 |
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| 135 | if ((*c & 0x80) != 0x80)
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| 136 | return num;
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| 137 |
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| 138 | if (((*c & 0xE0) == 0xC0) && (num == 2)) {
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| 139 | return num;
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| 140 | }
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| 141 | else if (((*c & 0xF0) == 0xE0) && (num == 3)) {
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| 142 | return num;
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| 143 | }
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| 144 | else if (((*c & 0xF8) == 0xF0) && (num == 4)) {
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| 145 | return num;
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| 146 | }
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| 147 | else if (((*c & 0xFC) == 0xF8) && (num == 5)) {
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| 148 | return num;
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| 149 | }
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| 150 | else if (((*c & 0xFE) == 0xFC) && (num == 6)) {
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| 151 | return num;
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| 152 | }
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| 153 | else {
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| 154 | if (local_pos > 0) {
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| 155 | local_pos--;
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| 156 | num++;
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| 157 | }
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| 158 | else
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| 159 | return 0;
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| 160 | }
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| 161 | }
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| 162 |
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| 163 | return 0;
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| 164 | }
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| 165 |
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| 166 | /**
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| 167 | * @brief Delete a character.
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| 168 | *
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| 169 | * @param p A pointer to the text editor handler.
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| 170 | */
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| 171 | int text_editor_backspace(text_editor_t *p)
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| 172 | {
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| 173 | int bs_char_num;
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| 174 |
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| 175 | if (0 < p->pos) {
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| 176 | int n = p->len - p->pos;
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| 177 | int i;
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| 178 | char *src = p->buffer + p->pos - 0;
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| 179 | char *des = p->buffer + p->pos - 1;
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| 180 |
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| 181 | bs_char_num = bs_char_count(p->buffer, p->pos - 1);
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| 182 | p->pos -= bs_char_num;
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| 183 | p->len -= bs_char_num;
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| 184 |
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| 185 | for (i = 0; i < n; i++) {
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| 186 | *des = *src;
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| 187 | des++;
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| 188 | src++;
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| 189 | }
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| 190 | *(p->buffer + p->len) = '\0';
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| 191 | return (bs_char_num > 2 ? 2 : 1);
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| 192 | }
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| 193 | return 0;
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| 194 | }
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| 195 |
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| 196 | /**
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| 197 | * @brief Delete a character.
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| 198 | *
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| 199 | * @param p A pointer to the text editor handler.
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| 200 | */
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| 201 | int text_editor_delete(text_editor_t *p)
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| 202 | {
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| 203 | if (p->pos < p->len) {
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| 204 | int n = p->len - p->pos - 1;
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| 205 | int i;
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| 206 | char *src = p->buffer + p->pos + 1;
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| 207 | char *des = p->buffer + p->pos + 0;
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| 208 | p->len--;
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| 209 | for (i = 0; i < n; i++) {
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| 210 | *des = *src;
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| 211 | des++;
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| 212 | src++;
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| 213 | }
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| 214 | *(p->buffer + p->len) = '\0';
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| 215 | return 1;
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| 216 | }
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| 217 | return 0;
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| 218 | }
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| 219 |
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| 220 | /**
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| 221 | * @brief Get the cursor position.
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| 222 | *
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| 223 | * @param p A pointer to the text editor handler.
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| 224 | */
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| 225 | int text_editor_cursor_get_position(text_editor_t *p)
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| 226 | {
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| 227 | return p->pos;
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| 228 | }
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| 229 |
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| 230 | /**
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| 231 | * @brief Move to the cursor to the head of the line.
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| 232 | *
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| 233 | * @param p A pointer to the text editor handler.
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| 234 | */
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| 235 | int text_editor_cursor_head(text_editor_t *p)
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| 236 | {
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| 237 | if (0 < p->pos) {
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| 238 | p->pos = 0;
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| 239 | return 1;
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| 240 | }
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| 241 | return 0;
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| 242 | }
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| 243 |
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| 244 | /**
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| 245 | * @brief Move to the cursor to the tail of the line.
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| 246 | *
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| 247 | * @param p A pointer to the text editor handler.
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| 248 | */
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| 249 | int text_editor_cursor_tail(text_editor_t *p)
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| 250 | {
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| 251 | if (p->pos < p->len) {
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| 252 | p->pos = p->len;
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| 253 | return 1;
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| 254 | }
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| 255 | return 0;
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| 256 | }
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| 257 |
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| 258 | /**
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| 259 | * @brief Move to the cursor to left.
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| 260 | *
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| 261 | * @param p A pointer to the text editor handler.
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| 262 | */
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| 263 | int text_editor_cursor_left(text_editor_t *p)
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| 264 | {
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| 265 | if (0 < p->pos) {
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| 266 | p->pos--;
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| 267 | return 1;
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| 268 | }
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| 269 | return 0;
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| 270 | }
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| 271 |
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| 272 | /**
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| 273 | * @brief Move to the cursor to right.
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| 274 | *
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| 275 | * @param p A pointer to the text editor handler.
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| 276 | */
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| 277 | int text_editor_cursor_right(text_editor_t *p)
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| 278 | {
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| 279 | if (p->pos < p->len) {
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| 280 | p->pos++;
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| 281 | return 1;
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| 282 | }
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| 283 | return 0;
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| 284 | }
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| 285 |
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| 286 | /**
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| 287 | * @brief Set the edit line.
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| 288 | *
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| 289 | * @param p A pointer to the text editor handler.
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| 290 | * @param buf A text string.
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| 291 | */
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| 292 | int text_editor_set_text(text_editor_t *p, char *buf)
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| 293 | {
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| 294 | char *src = buf;
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| 295 | char *des = p->buffer;
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| 296 | int n = 0;
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| 297 | while (*src) {
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| 298 | *des = *src;
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| 299 | des++;
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| 300 | src++;
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| 301 | n++;
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| 302 | if ((int)sizeof(p->buffer) <= n - 1) {
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| 303 | break;
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| 304 | }
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| 305 | }
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| 306 | *des = '\0';
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| 307 | p->len = n;
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| 308 | p->pos = p->len;
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| 309 | return n;
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| 310 | }
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| 311 |
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| 312 | /**
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| 313 | * @brief Get the edit line.
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| 314 | *
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| 315 | * @param p A pointer to the text editor handler.
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| 316 | * @param buf A text string.
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| 317 | * @param siz Size of the text string buffer.
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| 318 | */
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| 319 | int text_editor_get_text(text_editor_t *p, char *buf, int siz)
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| 320 | {
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| 321 | char *src = p->buffer;
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| 322 | char *des = buf;
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| 323 | int n = 0;
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| 324 | while (*src) {
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| 325 | *des++ = *src++;
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| 326 | n++;
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| 327 | if (siz <= n) {
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| 328 | break;
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| 329 | }
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| 330 | }
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| 331 | *des = '\0';
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| 332 | return n;
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| 333 | }
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| 334 |
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| 335 | /**
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| 336 | * @brief Clear the text string.
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| 337 | *
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| 338 | * @param p A pointer to the text editor handler.
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| 339 | */
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| 340 | void text_editor_clear(text_editor_t *p)
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| 341 | {
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| 342 | p->pos = 0;
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| 343 | p->len = 0;
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| 344 | p->buffer[p->len] = '\0';
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| 345 | }
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