| 1 | /*
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| 2 | * SPDX-FileCopyrightText: 2022 Jiri Svoboda
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| 3 | *
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| 4 | * SPDX-License-Identifier: BSD-3-Clause
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| 5 | */
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| 6 |
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| 7 | /** @addtogroup libui
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| 8 | * @{
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| 9 | */
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| 10 | /**
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| 11 | * @file Accelerator processing
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| 12 | */
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| 13 |
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| 14 | #include <ctype.h>
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| 15 | #include <errno.h>
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| 16 | #include <stdlib.h>
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| 17 | #include <str.h>
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| 18 | #include <ui/accel.h>
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| 19 |
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| 20 | /** Process text with accelerator markup.
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| 21 | *
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| 22 | * Parse text with tilde markup into a list of strings. @a *rbuf is set
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| 23 | * to point to a newly allocated buffer containing consecutive null-terminated
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| 24 | * strings.
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| 25 | *
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| 26 | * Each part between two '~' becomes one string. '~~' is translated into
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| 27 | * a literal '~' character. @a *endptr is set to point to the first character
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| 28 | * beyond the end of the list.
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| 29 | *
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| 30 | * @param str String with tilde markup
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| 31 | * @param rbuf Place to store pointer to newly allocated buffer.
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| 32 | * @param endptr Place to store end pointer (just after last character)
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| 33 | * @return EOK on success or an error code
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| 34 | */
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| 35 | errno_t ui_accel_process(const char *str, char **rbuf, char **endptr)
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| 36 | {
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| 37 | const char *sp;
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| 38 | char *dp;
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| 39 | char *buf;
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| 40 |
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| 41 | buf = malloc(str_size(str) + 1);
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| 42 | if (buf == NULL)
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| 43 | return ENOMEM;
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| 44 |
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| 45 | /* Break down string into list of (non)highlighted parts */
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| 46 | sp = str;
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| 47 | dp = buf;
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| 48 | while (*sp != '\0') {
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| 49 | if (*sp == '~') {
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| 50 | if (sp[1] == '~') {
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| 51 | sp += 2;
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| 52 | *dp++ = '~';
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| 53 | } else {
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| 54 | ++sp;
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| 55 | *dp++ = '\0';
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| 56 | }
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| 57 | } else {
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| 58 | *dp++ = *sp++;
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| 59 | }
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| 60 | }
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| 61 |
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| 62 | *dp++ = '\0';
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| 63 | *rbuf = buf;
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| 64 | *endptr = dp;
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| 65 |
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| 66 | return EOK;
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| 67 | }
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| 68 |
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| 69 | /** Get accelerator character from marked-up string.
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| 70 | *
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| 71 | * @param str String with '~' accelerator markup
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| 72 | *
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| 73 | * @return Accelerator character (lowercase) or the null character if
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| 74 | * the menu has no accelerator.
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| 75 | */
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| 76 | char32_t ui_accel_get(const char *str)
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| 77 | {
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| 78 | const char *sp = str;
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| 79 | size_t off;
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| 80 |
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| 81 | while (*sp != '\0') {
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| 82 | if (*sp == '~') {
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| 83 | if (sp[1] == '~') {
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| 84 | ++sp;
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| 85 | } else {
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| 86 | /* Found the accelerator */
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| 87 | ++sp;
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| 88 | break;
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| 89 | }
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| 90 | }
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| 91 |
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| 92 | ++sp;
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| 93 | }
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| 94 |
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| 95 | if (*sp == '\0') {
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| 96 | /* No accelerator */
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| 97 | return '\0';
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| 98 | }
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| 99 |
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| 100 | /* Decode accelerator character */
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| 101 | off = 0;
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| 102 |
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| 103 | /*
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| 104 | * NOTE: tolower is unlike to actually convert to lowercase
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| 105 | * in case of non-ASCII characters
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| 106 | */
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| 107 | return tolower(str_decode(sp, &off, STR_NO_LIMIT));
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| 108 | }
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| 109 |
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| 110 | /** @}
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| 111 | */
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