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#ifndef TERM_TEXT_RUN_H
#define TERM_TEXT_RUN_H
#include "cell.h"
#include "unicode/unicode.h"
#include "unicode/grapheme.h"
#define UTF8_LEAD_MIN 0xc2
#define UTF8_LEAD_MAX 0xf4
#define UTF8_LEAD3_TAG 0xE0
#define UTF8_LEAD3_MASK 0xF0
#define TERM_WIDTH_SLOTS 4
struct width_cache {
uint32_t lo[TERM_WIDTH_SLOTS];
uint32_t span[TERM_WIDTH_SLOTS];
uint8_t klass;
uint8_t next;
};
/* term_new() builds the shared tables before any terminal can use them. */
bool term_tables_ready(void);
void term_text_tables_init(void);
int term_text_class(uint32_t cp);
struct text_run_result {
int bytes;
int cols;
uint32_t last;
};
struct text_run_result term_text_run(struct cell *restrict row, const char *restrict buf,
int len, int max_cols, uint32_t fg, uint32_t bg,
uint32_t flags, uint32_t last, struct width_cache *restrict wc);
struct text_run_bytes {
int bytes; /* input used */
int cols;
int out; /* bytes written */
int chars;
uint32_t last;
bool wide, narrow; /* narrow: every character was one ASCII byte */
};
/* term_text_run() with the same rules, that writes the text in the history
* format instead of cells: raw UTF-8, a wide character after 0xF5. dst has
* room for 4 bytes per column. */
struct text_run_bytes term_text_run_bytes(uint8_t *restrict dst, const char *restrict buf, int len,
int max_cols, uint32_t last, struct width_cache *restrict wc);
static inline bool joins_cluster(uint32_t cp, int klass)
{
if (cp < 0x0300)
return false;
if (klass == 0 || grapheme_emoji_modifier(cp))
return true;
return klass == 1 && unicode_spacing_mark(cp);
}
static inline bool can_extend_cluster(uint32_t last_char, uint32_t cp, int klass)
{
if (klass == 0) return true;
if (last_char == 0x200D || grapheme_is_handle(last_char)) return true;
if (cp - 0x1F1E6u <= 0x19u && grapheme_regional_indicator(cp))
return true;
return joins_cluster(cp, klass);
}
static inline bool cluster_contextual(uint32_t cp)
{
return unicode_spacing_mark(cp) || grapheme_emoji_modifier(cp) ||
(cp - 0x1F1E6u <= 0x19u && grapheme_regional_indicator(cp));
}
static inline bool cluster_joins(const uint32_t *cps, int len,
uint32_t cp, int klass)
{
if (joins_cluster(cp, klass))
return true;
if (cps[len - 1] == 0x200D)
return unicode_extended_pictographic(cp);
return len == 1 && cp - 0x1F1E6u <= 0x19u &&
grapheme_regional_indicator(cp) &&
grapheme_regional_indicator(cps[0]);
}
#endif
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