/// Returns the number of characters in the escape code starting at 'code'. We only handle sequences
/// that begin with \x1B. If it doesn't we return zero. We also return zero if we don't recognize the
/// escape sequence based on querying terminfo and other heuristics.
size_t escape_code_length(const wchar_t *code) {
assert(code != NULL);
if (*code != L'\x1B') return 0;
size_t esc_seq_len = cached_layouts.find_escape_code(code);
if (esc_seq_len) return esc_seq_len;
bool found = is_color_escape_seq(code, &esc_seq_len);
if (!found) found = is_visual_escape_seq(code, &esc_seq_len);
if (!found) found = is_screen_name_escape_seq(code, &esc_seq_len);
if (!found) found = is_iterm2_escape_seq(code, &esc_seq_len);
if (!found) found = is_single_byte_escape_seq(code, &esc_seq_len);
if (!found) found = is_csi_style_escape_seq(code, &esc_seq_len);
if (!found) found = is_two_byte_escape_seq(code, &esc_seq_len);
if (found) cached_layouts.add_escape_code(wcstring(code, esc_seq_len));
return esc_seq_len;
}
/// Returns the number of characters in the escape code starting at 'code' (which should initially
/// contain \x1b).
size_t escape_code_length(const wchar_t *code) {
assert(code != NULL);
// The only escape codes we recognize start with \x1b.
if (code[0] != L'\x1b') return 0;
size_t resulting_length = 0;
bool found = false;
if (cur_term != NULL) {
// Detect these terminfo color escapes with parameter value 0..7, all of which don't move
// the cursor.
char *const esc[] = {
set_a_foreground, set_a_background, set_foreground, set_background,
};
for (size_t p = 0; p < sizeof esc / sizeof *esc && !found; p++) {
if (!esc[p]) continue;
for (size_t k = 0; k < 8; k++) {
size_t len = try_sequence(tparm(esc[p], k), code);
if (len) {
resulting_length = len;
found = true;
break;
}
}
}
}
if (cur_term != NULL) {
// Detect these semi-common terminfo escapes without any parameter values, all of which
// don't move the cursor.
char *const esc2[] = {enter_bold_mode, exit_attribute_mode, enter_underline_mode,
exit_underline_mode, enter_standout_mode, exit_standout_mode,
flash_screen, enter_subscript_mode, exit_subscript_mode,
enter_superscript_mode, exit_superscript_mode, enter_blink_mode,
enter_italics_mode, exit_italics_mode, enter_reverse_mode,
enter_shadow_mode, exit_shadow_mode, enter_standout_mode,
exit_standout_mode, enter_secure_mode};
for (size_t p = 0; p < sizeof esc2 / sizeof *esc2 && !found; p++) {
if (!esc2[p]) continue;
// Test both padded and unpadded version, just to be safe. Most versions of tparm don't
// actually seem to do anything these days.
size_t len = maxi(try_sequence(tparm(esc2[p]), code), try_sequence(esc2[p], code));
if (len) {
resulting_length = len;
found = true;
}
}
}
if (!found) found = is_screen_name_escape_seq(code, &resulting_length);
if (!found) found = is_iterm2_escape_seq(code, &resulting_length);
if (!found) found = is_single_byte_escape_seq(code, &resulting_length);
if (!found) found = is_csi_style_escape_seq(code, &resulting_length);
if (!found) found = is_two_byte_escape_seq(code, &resulting_length);
return resulting_length;
}