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Optimize _camelcase_to_underscore (and thus String.capitalize) by using a rolling cache of character attributes, instead of re-computing each iteration.

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This commit is contained in:
Lukas Tenbrink
2024-12-04 18:39:38 +01:00
parent 0f20e67d8d
commit 8d82933c7c
1 changed files with 16 additions and 8 deletions
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24
core/string/ustring.cpp
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@@ -1109,17 +1109,21 @@ String String::_camelcase_to_underscore() const {
String new_string;
int start_index = 0;
for (int i = 1; i < size(); i++) {
bool is_prev_upper = is_unicode_upper_case(cstr[i - 1]);
bool is_prev_lower = is_unicode_lower_case(cstr[i - 1]);
bool is_prev_digit = is_digit(cstr[i - 1]);
if (length() == 0) {
return *this;
}
bool is_curr_upper = is_unicode_upper_case(cstr[i]);
bool is_curr_lower = is_unicode_lower_case(cstr[i]);
bool is_curr_digit = is_digit(cstr[i]);
bool is_prev_upper = is_unicode_upper_case(cstr[0]);
bool is_prev_lower = is_unicode_lower_case(cstr[0]);
bool is_prev_digit = is_digit(cstr[0]);
for (int i = 1; i < length(); i++) {
const bool is_curr_upper = is_unicode_upper_case(cstr[i]);
const bool is_curr_lower = is_unicode_lower_case(cstr[i]);
const bool is_curr_digit = is_digit(cstr[i]);
bool is_next_lower = false;
if (i + 1 < size()) {
if (i + 1 < length()) {
is_next_lower = is_unicode_lower_case(cstr[i + 1]);
}
@@ -1132,6 +1136,10 @@ String String::_camelcase_to_underscore() const {
new_string += substr(start_index, i - start_index) + "_";
start_index = i;
}
is_prev_upper = is_curr_upper;
is_prev_lower = is_curr_lower;
is_prev_digit = is_curr_digit;
}
new_string += substr(start_index, size() - start_index);