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Reduce input latency searching for readline function mappings

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The lookups are executed on all input events, so they are worth
optimizing.

Cache the list of names, use binary search to get a function code from a
name, and stop enumerating mappings after `has_function` and `has_command`
have been determined.
This commit is contained in:
Mahmoud Al-Qudsi 2021-02-07 16:59:07 -06:00
parent 6dd6a57c60
commit 5c014e129a
2 changed files with 107 additions and 88 deletions
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193
src/input.cpp
View file

@ -80,87 +80,89 @@ static constexpr size_t input_function_count = R_END_INPUT_FUNCTIONS;
/// Input function metadata. This list should be kept in sync with the key code list in
/// input_common.h.
struct input_function_metadata_t {
readline_cmd_t code;
const wchar_t *name;
readline_cmd_t code;
};
/// A static mapping of all readline commands as strings to their readline_cmd_t equivalent.
/// Keep this list sorted alphabetically!
static const input_function_metadata_t input_function_metadata[] = {
{readline_cmd_t::beginning_of_line, L"beginning-of-line"},
{readline_cmd_t::end_of_line, L"end-of-line"},
{readline_cmd_t::forward_char, L"forward-char"},
{readline_cmd_t::backward_char, L"backward-char"},
{readline_cmd_t::forward_single_char, L"forward-single-char"},
{readline_cmd_t::forward_word, L"forward-word"},
{readline_cmd_t::backward_word, L"backward-word"},
{readline_cmd_t::forward_bigword, L"forward-bigword"},
{readline_cmd_t::backward_bigword, L"backward-bigword"},
{readline_cmd_t::history_prefix_search_backward, L"history-prefix-search-backward"},
{readline_cmd_t::history_prefix_search_forward, L"history-prefix-search-forward"},
{readline_cmd_t::history_search_backward, L"history-search-backward"},
{readline_cmd_t::history_search_forward, L"history-search-forward"},
{readline_cmd_t::delete_char, L"delete-char"},
{readline_cmd_t::backward_delete_char, L"backward-delete-char"},
{readline_cmd_t::kill_line, L"kill-line"},
{readline_cmd_t::yank, L"yank"},
{readline_cmd_t::yank_pop, L"yank-pop"},
{readline_cmd_t::complete, L"complete"},
{readline_cmd_t::complete_and_search, L"complete-and-search"},
{readline_cmd_t::pager_toggle_search, L"pager-toggle-search"},
{readline_cmd_t::beginning_of_history, L"beginning-of-history"},
{readline_cmd_t::end_of_history, L"end-of-history"},
{readline_cmd_t::backward_kill_line, L"backward-kill-line"},
{readline_cmd_t::kill_whole_line, L"kill-whole-line"},
{readline_cmd_t::kill_word, L"kill-word"},
{readline_cmd_t::kill_bigword, L"kill-bigword"},
{readline_cmd_t::backward_kill_word, L"backward-kill-word"},
{readline_cmd_t::backward_kill_path_component, L"backward-kill-path-component"},
{readline_cmd_t::backward_kill_bigword, L"backward-kill-bigword"},
{readline_cmd_t::history_token_search_backward, L"history-token-search-backward"},
{readline_cmd_t::history_token_search_forward, L"history-token-search-forward"},
{readline_cmd_t::self_insert, L"self-insert"},
{readline_cmd_t::self_insert_notfirst, L"self-insert-notfirst"},
{readline_cmd_t::transpose_chars, L"transpose-chars"},
{readline_cmd_t::transpose_words, L"transpose-words"},
{readline_cmd_t::upcase_word, L"upcase-word"},
{readline_cmd_t::downcase_word, L"downcase-word"},
{readline_cmd_t::capitalize_word, L"capitalize-word"},
{readline_cmd_t::togglecase_char, L"togglecase-char"},
{readline_cmd_t::togglecase_selection, L"togglecase-selection"},
{readline_cmd_t::execute, L"execute"},
{readline_cmd_t::beginning_of_buffer, L"beginning-of-buffer"},
{readline_cmd_t::end_of_buffer, L"end-of-buffer"},
{readline_cmd_t::repaint_mode, L"repaint-mode"},
{readline_cmd_t::repaint, L"repaint"},
{readline_cmd_t::force_repaint, L"force-repaint"},
{readline_cmd_t::up_line, L"up-line"},
{readline_cmd_t::down_line, L"down-line"},
{readline_cmd_t::suppress_autosuggestion, L"suppress-autosuggestion"},
{readline_cmd_t::accept_autosuggestion, L"accept-autosuggestion"},
{readline_cmd_t::begin_selection, L"begin-selection"},
{readline_cmd_t::swap_selection_start_stop, L"swap-selection-start-stop"},
{readline_cmd_t::end_selection, L"end-selection"},
{readline_cmd_t::kill_selection, L"kill-selection"},
{readline_cmd_t::insert_line_under, L"insert-line-under"},
{readline_cmd_t::insert_line_over, L"insert-line-over"},
{readline_cmd_t::forward_jump, L"forward-jump"},
{readline_cmd_t::backward_jump, L"backward-jump"},
{readline_cmd_t::forward_jump_till, L"forward-jump-till"},
{readline_cmd_t::backward_jump_till, L"backward-jump-till"},
{readline_cmd_t::repeat_jump, L"repeat-jump"},
{readline_cmd_t::reverse_repeat_jump, L"repeat-jump-reverse"},
{readline_cmd_t::func_and, L"and"},
{readline_cmd_t::func_or, L"or"},
{readline_cmd_t::expand_abbr, L"expand-abbr"},
{readline_cmd_t::delete_or_exit, L"delete-or-exit"},
{readline_cmd_t::exit, L"exit"},
{readline_cmd_t::cancel_commandline, L"cancel-commandline"},
{readline_cmd_t::cancel, L"cancel"},
{readline_cmd_t::undo, L"undo"},
{readline_cmd_t::redo, L"redo"},
{readline_cmd_t::begin_undo_group, L"begin-undo-group"},
{readline_cmd_t::end_undo_group, L"end-undo-group"},
// NULL makes it unusable - this is specially inserted when we detect mouse input
{readline_cmd_t::disable_mouse_tracking, NULL},
{L"", readline_cmd_t::disable_mouse_tracking},
{L"accept-autosuggestion", readline_cmd_t::accept_autosuggestion},
{L"and", readline_cmd_t::func_and},
{L"backward-bigword", readline_cmd_t::backward_bigword},
{L"backward-char", readline_cmd_t::backward_char},
{L"backward-delete-char", readline_cmd_t::backward_delete_char},
{L"backward-jump", readline_cmd_t::backward_jump},
{L"backward-jump-till", readline_cmd_t::backward_jump_till},
{L"backward-kill-bigword", readline_cmd_t::backward_kill_bigword},
{L"backward-kill-line", readline_cmd_t::backward_kill_line},
{L"backward-kill-path-component", readline_cmd_t::backward_kill_path_component},
{L"backward-kill-word", readline_cmd_t::backward_kill_word},
{L"backward-word", readline_cmd_t::backward_word},
{L"begin-selection", readline_cmd_t::begin_selection},
{L"begin-undo-group", readline_cmd_t::begin_undo_group},
{L"beginning-of-buffer", readline_cmd_t::beginning_of_buffer},
{L"beginning-of-history", readline_cmd_t::beginning_of_history},
{L"beginning-of-line", readline_cmd_t::beginning_of_line},
{L"cancel", readline_cmd_t::cancel},
{L"cancel-commandline", readline_cmd_t::cancel_commandline},
{L"capitalize-word", readline_cmd_t::capitalize_word},
{L"complete", readline_cmd_t::complete},
{L"complete-and-search", readline_cmd_t::complete_and_search},
{L"delete-char", readline_cmd_t::delete_char},
{L"delete-or-exit", readline_cmd_t::delete_or_exit},
{L"down-line", readline_cmd_t::down_line},
{L"downcase-word", readline_cmd_t::downcase_word},
{L"end-of-buffer", readline_cmd_t::end_of_buffer},
{L"end-of-history", readline_cmd_t::end_of_history},
{L"end-of-line", readline_cmd_t::end_of_line},
{L"end-selection", readline_cmd_t::end_selection},
{L"end-undo-group", readline_cmd_t::end_undo_group},
{L"execute", readline_cmd_t::execute},
{L"exit", readline_cmd_t::exit},
{L"expand-abbr", readline_cmd_t::expand_abbr},
{L"force-repaint", readline_cmd_t::force_repaint},
{L"forward-bigword", readline_cmd_t::forward_bigword},
{L"forward-char", readline_cmd_t::forward_char},
{L"forward-jump", readline_cmd_t::forward_jump},
{L"forward-jump-till", readline_cmd_t::forward_jump_till},
{L"forward-single-char", readline_cmd_t::forward_single_char},
{L"forward-word", readline_cmd_t::forward_word},
{L"history-prefix-search-backward", readline_cmd_t::history_prefix_search_backward},
{L"history-prefix-search-forward", readline_cmd_t::history_prefix_search_forward},
{L"history-search-backward", readline_cmd_t::history_search_backward},
{L"history-search-forward", readline_cmd_t::history_search_forward},
{L"history-token-search-backward", readline_cmd_t::history_token_search_backward},
{L"history-token-search-forward", readline_cmd_t::history_token_search_forward},
{L"insert-line-over", readline_cmd_t::insert_line_over},
{L"insert-line-under", readline_cmd_t::insert_line_under},
{L"kill-bigword", readline_cmd_t::kill_bigword},
{L"kill-line", readline_cmd_t::kill_line},
{L"kill-selection", readline_cmd_t::kill_selection},
{L"kill-whole-line", readline_cmd_t::kill_whole_line},
{L"kill-word", readline_cmd_t::kill_word},
{L"or", readline_cmd_t::func_or},
{L"pager-toggle-search", readline_cmd_t::pager_toggle_search},
{L"redo", readline_cmd_t::redo},
{L"repaint", readline_cmd_t::repaint},
{L"repaint-mode", readline_cmd_t::repaint_mode},
{L"repeat-jump", readline_cmd_t::repeat_jump},
{L"repeat-jump-reverse", readline_cmd_t::reverse_repeat_jump},
{L"self-insert", readline_cmd_t::self_insert},
{L"self-insert-notfirst", readline_cmd_t::self_insert_notfirst},
{L"suppress-autosuggestion", readline_cmd_t::suppress_autosuggestion},
{L"swap-selection-start-stop", readline_cmd_t::swap_selection_start_stop},
{L"togglecase-char", readline_cmd_t::togglecase_char},
{L"togglecase-selection", readline_cmd_t::togglecase_selection},
{L"transpose-chars", readline_cmd_t::transpose_chars},
{L"transpose-words", readline_cmd_t::transpose_words},
{L"undo", readline_cmd_t::undo},
{L"up-line", readline_cmd_t::up_line},
{L"upcase-word", readline_cmd_t::upcase_word},
{L"yank", readline_cmd_t::yank},
{L"yank-pop", readline_cmd_t::yank_pop},
};
static_assert(sizeof(input_function_metadata) / sizeof(input_function_metadata[0]) ==
@ -375,6 +377,10 @@ void inputter_t::mapping_execute(const input_mapping_t &m,
} else {
has_commands = true;
}
if (has_functions && has_commands) {
break;
}
}
// !has_functions && !has_commands: only set bind mode
@ -817,22 +823,35 @@ wcstring_list_t input_terminfo_get_names(bool skip_null) {
return result;
}
wcstring_list_t input_function_get_names() {
wcstring_list_t result;
result.reserve(input_function_count);
for (const auto &md : input_function_metadata) {
if (md.name) {
result.push_back(md.name);
const wcstring_list_t &input_function_get_names() {
// The list and names of input functions are hard-coded and never change
static wcstring_list_t result = ([&]() {
wcstring_list_t result;
result.reserve(input_function_count);
for (const auto &md : input_function_metadata) {
if (md.name[0]) {
result.push_back(md.name);
}
}
}
return result;
})();
return result;
}
maybe_t<readline_cmd_t> input_function_get_code(const wcstring &name) {
for (const auto &md : input_function_metadata) {
if (md.name && name == md.name) {
return md.code;
}
// `input_function_metadata` is required to be kept in asciibetical order, making it OK to do
// a binary search for the matching name.
constexpr auto end = &input_function_metadata[0] + input_function_count;
auto result = std::lower_bound(
&input_function_metadata[0], end,
input_function_metadata_t{name.data(), static_cast<readline_cmd_t>(-1)},
[&](const input_function_metadata_t &lhs, const input_function_metadata_t &rhs) {
return wcscmp(lhs.name, rhs.name) < 0;
});
if (result != end && result->name[0] && name == result->name) {
return result->code;
}
return none();
}

2
src/input.h
View file

@ -144,6 +144,6 @@ wcstring_list_t input_terminfo_get_names(bool skip_null);
maybe_t<readline_cmd_t> input_function_get_code(const wcstring &name);
/// Returns a list of all existing input function names.
wcstring_list_t input_function_get_names(void);
const wcstring_list_t &input_function_get_names(void);
#endif