mirror of
https://github.com/tmux/tmux.git
synced 2025-11-04 00:56:10 +00:00
Rewrite key string conversions to be readable and to work properly for
multiple modifiers.
This commit is contained in:
Nicholas Marriott
198
key-string.c
198
key-string.c
@@ -23,10 +23,11 @@
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#include "tmux.h"
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int key_string_search_table(const char *);
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int key_string_get_modifiers(const char **);
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struct {
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const char *string;
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int key;
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const char *string;
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int key;
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} key_string_table[] = {
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/* Function keys. */
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{ "F1", KEYC_F1 },
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@@ -100,146 +101,123 @@ key_string_search_table(const char *string)
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return (KEYC_NONE);
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}
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/* Lookup a string and convert to a key value, handling C-/M-/S- prefix. */
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/* Find modifiers. */
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int
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key_string_get_modifiers(const char **string)
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{
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int modifiers;
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modifiers = 0;
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while (((*string)[0] != '\0') && (*string)[1] == '-') {
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switch ((*string)[0]) {
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case 'C':
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case 'c':
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modifiers |= KEYC_CTRL;
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break;
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case 'M':
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case 'm':
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modifiers |= KEYC_ESCAPE;
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break;
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case 'S':
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case 's':
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modifiers |= KEYC_SHIFT;
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break;
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}
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*string += 2;
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}
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return (modifiers);
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}
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/* Lookup a string and convert to a key value. */
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int
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key_string_lookup_string(const char *string)
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{
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int key;
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const char *ptr;
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int key, modifiers;
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/* Check for modifiers. */
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modifiers = 0;
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if (string[0] == '^' && string[1] != '\0') {
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modifiers |= KEYC_CTRL;
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string++;
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}
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modifiers |= key_string_get_modifiers(&string);
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if (string[0] == '\0')
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return (KEYC_NONE);
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if (string[1] == '\0')
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return ((u_char) string[0]);
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ptr = NULL;
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if ((string[0] == 'C' || string[0] == 'c') && string[1] == '-')
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ptr = string + 2;
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else if (string[0] == '^')
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ptr = string + 1;
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if (ptr != NULL) {
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if (ptr[0] == '\0')
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/* Is this a standard ASCII key? */
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if (string[1] == '\0') {
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key = (u_char) string[0];
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if (key < 32 || key > 126)
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return (KEYC_NONE);
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/*
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* Lookup as a named key. If a function key (>= KEYC_BASE),
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* return it with the ctrl modifier, otherwise fallthrough with
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* the key value from the table (eg for C-Space). If not a
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* named key, check for single character keys and try that.
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*/
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key = key_string_search_table(ptr);
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if (key != KEYC_NONE) {
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if (key >= KEYC_BASE)
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return (key | KEYC_CTRL);
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} else {
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if (ptr[1] != '\0')
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/* Convert the standard control keys. */
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if (modifiers & KEYC_CTRL) {
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if (key >= 97 && key <= 122)
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key -= 96;
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else if (key >= 65 && key <= 90)
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key -= 65;
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else if (key == 32)
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key = 0;
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else if (key == 63)
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key = KEYC_BSPACE;
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else
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return (KEYC_NONE);
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key = (u_char) ptr[0];
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modifiers &= ~KEYC_CTRL;
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}
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/*
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* Figure out if the single character in key is a valid ctrl
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* key.
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*/
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if (key == 32)
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return (0);
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if (key == 63)
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return (KEYC_BSPACE);
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if (key >= 64 && key <= 95)
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return (key - 64);
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if (key >= 97 && key <= 122)
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return (key - 96);
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return (KEYC_NONE);
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return (key | modifiers);
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}
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if ((string[0] == 'M' || string[0] == 'm') && string[1] == '-') {
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ptr = string + 2;
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if (ptr[0] == '\0')
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return (KEYC_NONE);
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key = key_string_lookup_string(ptr);
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if (key != KEYC_NONE) {
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if (key >= KEYC_BASE)
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return (key | KEYC_ESCAPE);
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} else {
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if (ptr[1] == '\0')
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return (KEYC_NONE);
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key = (u_char) ptr[0];
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}
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if (key >= 32 && key <= 127)
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return (key | KEYC_ESCAPE);
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/* Otherwise look the key up in the table. */
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key = key_string_search_table(string);
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if (key == KEYC_NONE)
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return (KEYC_NONE);
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}
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if ((string[0] == 'S' || string[0] == 's') && string[1] == '-') {
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ptr = string + 2;
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if (ptr[0] == '\0')
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return (KEYC_NONE);
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key = key_string_lookup_string(ptr);
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if (key != KEYC_NONE) {
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if (key >= KEYC_BASE)
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return (key | KEYC_SHIFT);
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} else {
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if (ptr[1] == '\0')
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return (KEYC_NONE);
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key = (u_char) ptr[0];
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}
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if (key >= 32 && key <= 127)
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return (key | KEYC_SHIFT);
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return (KEYC_NONE);
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}
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return (key_string_search_table(string));
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return (key | modifiers);
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}
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/* Convert a key code into string format, with prefix if necessary. */
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const char *
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key_string_lookup_key(int key)
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{
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static char tmp[24], tmp2[24];
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const char *s;
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u_int i;
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static char out[24];
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char tmp[8];
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u_int i;
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if (key == 127)
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return (NULL);
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*out = '\0';
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if (key & KEYC_ESCAPE) {
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if ((s = key_string_lookup_key(key & ~KEYC_ESCAPE)) == NULL)
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return (NULL);
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xsnprintf(tmp2, sizeof tmp2, "M-%s", s);
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return (tmp2);
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}
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if (key & KEYC_CTRL) {
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if ((s = key_string_lookup_key(key & ~KEYC_CTRL)) == NULL)
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return (NULL);
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xsnprintf(tmp2, sizeof tmp2, "C-%s", s);
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return (tmp2);
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}
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if (key & KEYC_SHIFT) {
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if ((s = key_string_lookup_key(key & ~KEYC_SHIFT)) == NULL)
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return (NULL);
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xsnprintf(tmp2, sizeof tmp2, "S-%s", s);
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return (tmp2);
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}
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/* Fill in the modifiers. */
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if (key & KEYC_CTRL)
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strlcat(out, "C-", sizeof out);
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if (key & KEYC_ESCAPE)
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strlcat(out, "M-", sizeof out);
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if (key & KEYC_SHIFT)
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strlcat(out, "S-", sizeof out);
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key &= ~(KEYC_CTRL|KEYC_ESCAPE|KEYC_SHIFT);
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/* Try the key against the string table. */
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for (i = 0; i < nitems(key_string_table); i++) {
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if (key == key_string_table[i].key)
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return (key_string_table[i].string);
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break;
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}
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if (i != nitems(key_string_table)) {
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strlcat(out, key_string_table[i].string, sizeof out);
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return (out);
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}
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if (key >= 32 && key <= 255) {
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tmp[0] = (char) key;
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tmp[1] = '\0';
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return (tmp);
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}
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/* Invalid keys are errors. */
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if (key >= 127)
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return (NULL);
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/* Check for standard or control key. */
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if (key >= 0 && key <= 32) {
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if (key == 0 || key > 26)
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xsnprintf(tmp, sizeof tmp, "C-%c", 64 + key);
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else
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xsnprintf(tmp, sizeof tmp, "C-%c", 96 + key);
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return (tmp);
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} else if (key >= 32 && key <= 126) {
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tmp[0] = key;
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tmp[1] = '\0';
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}
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return (NULL);
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strlcat(out, tmp, sizeof out);
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return (out);
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}
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