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search: utility functions distance_{next,prev}_word()

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These functions calculate the distance from the current cursor to the
next/previous word.
This commit is contained in:
Daniel Eklöf 2019-08-30 19:36:37 +02:00
parent fcb0e05009
commit 61318d068e
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1 changed files with 56 additions and 0 deletions
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search.c
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@ -1,6 +1,7 @@
#include "search.h"
#include <wchar.h>
#include <wctype.h>
#include <wayland-client.h>
#include <xkbcommon/xkbcommon-compose.h>
@ -217,6 +218,61 @@ search_update(struct terminal *term)
#undef ROW_DEC
}
static size_t
distance_next_word(const struct terminal *term)
{
size_t cursor = term->search.cursor;
/* First eat non-whitespace. This is the word we're skipping past */
while (cursor < term->search.len) {
if (iswspace(term->search.buf[cursor++]))
break;
}
assert(cursor == term->search.len || iswspace(term->search.buf[cursor - 1]));
/* Now skip past whitespace, so that we end up at the beginning of
* the next word */
while (cursor < term->search.len) {
if (!iswspace(term->search.buf[cursor++]))
break;
}
LOG_INFO("cursor = %zu, iswspace() = %d", cursor, iswspace(term->search.buf[cursor - 1]));
assert(cursor == term->search.len || !iswspace(term->search.buf[cursor - 1]));
if (cursor < term->search.len && !iswspace(term->search.buf[cursor]))
cursor--;
return cursor - term->search.cursor;
}
static size_t
distance_prev_word(const struct terminal *term)
{
int cursor = term->search.cursor;
/* First, eat whitespace prefix */
while (cursor > 0) {
if (!iswspace(term->search.buf[--cursor]))
break;
}
assert(cursor == 0 || !iswspace(term->search.buf[cursor]));
/* Now eat non-whitespace. This is the word we're skipping past */
while (cursor > 0) {
if (iswspace(term->search.buf[--cursor]))
break;
}
assert(cursor == 0 || iswspace(term->search.buf[cursor]));
if (iswspace(term->search.buf[cursor]))
cursor++;
return term->search.cursor - cursor;
}
void
search_input(struct terminal *term, uint32_t key, xkb_keysym_t sym, xkb_mod_mask_t mods)
{