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escape_code_length: Test colors last

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We have a *lot* of color sequences to try and tparm is slow (on the
whole, when you do this thousands of times).

So let's just check colors last, which makes everything else (which is
comparatively nothing) faster, while barely impacting
colors (benchmarking confirms no measurable difference).

Fixes #8253.
This commit is contained in:
Fabian Homborg 2021-08-26 21:01:55 +02:00
parent a36a26c28b
commit ee2d2caeaa
1 changed files with 4 additions and 2 deletions
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6
src/screen.cpp
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@ -252,13 +252,15 @@ maybe_t<size_t> escape_code_length(const wchar_t *code) {
if (*code != L'\x1B') return none();
size_t esc_seq_len = 0;
bool found = is_color_escape_seq(code, &esc_seq_len);
if (!found) found = is_visual_escape_seq(code, &esc_seq_len);
bool 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_osc_escape_seq(code, &esc_seq_len);
if (!found) found = is_three_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);
// Colors are the hardest to match, so we try last.
// (also tparm is *slow*, we should try to find a better replacement)
if (!found) found = is_color_escape_seq(code, &esc_seq_len);
return found ? maybe_t<size_t>{esc_seq_len} : none();
}