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LibVT: Use StringBuilder's inline capacity instead of temporary Strings

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This let's us avoid heap allocations.
This commit is contained in:
Idan Horowitz 2022-02-15 21:12:30 +02:00 • committed by Andreas Kling
parent 316fa0c3f3
commit 727fbca1a6
1 changed files with 11 additions and 5 deletions
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16
Userland/Libraries/LibVT/Terminal.cpp
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@ -975,7 +975,9 @@ void Terminal::DSR(Parameters params)
emit_string("\033[0n"); // Terminal status OK!
} else if (params.size() == 1 && params[0] == 6) {
// Cursor position query
emit_string(String::formatted("\e[{};{}R", cursor_row() + 1, cursor_column() + 1));
StringBuilder builder;
MUST(builder.try_appendff("\e[{};{}R", cursor_row() + 1, cursor_column() + 1)); // StringBuilder's inline capacity of 256 is enough to guarantee no allocations
emit_string(builder.string_view());
} else {
dbgln("Unknown DSR");
}
@ -1344,16 +1346,20 @@ void Terminal::handle_key_press(KeyCode key, u32 code_point, u8 flags)
auto emit_final_with_modifier = [this, modifier_mask](char final) {
char escape_character = m_cursor_keys_mode == CursorKeysMode::Application ? 'O' : '[';
StringBuilder builder;
if (modifier_mask)
emit_string(String::formatted("\e{}1;{}{:c}", escape_character, modifier_mask + 1, final));
MUST(builder.try_appendff("\e{}1;{}{:c}", escape_character, modifier_mask + 1, final)); // StringBuilder's inline capacity of 256 is enough to guarantee no allocations
else
emit_string(String::formatted("\e{}{:c}", escape_character, final));
MUST(builder.try_appendff("\e{}{:c}", escape_character, final)); // StringBuilder's inline capacity of 256 is enough to guarantee no allocations
emit_string(builder.string_view());
};
auto emit_tilde_with_modifier = [this, modifier_mask](unsigned num) {
StringBuilder builder;
if (modifier_mask)
emit_string(String::formatted("\e[{};{}~", num, modifier_mask + 1));
MUST(builder.try_appendff("\e[{};{}~", num, modifier_mask + 1)); // StringBuilder's inline capacity of 256 is enough to guarantee no allocations
else
emit_string(String::formatted("\e[{}~", num));
MUST(builder.try_appendff("\e[{}~", num)); // StringBuilder's inline capacity of 256 is enough to guarantee no allocations
emit_string(builder.string_view());
};
switch (key) {