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Clean up String::find to remove duplicate code, and speed up comparison with memcmp where possible.

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This commit is contained in:
Lukas Tenbrink
2025-09-22 14:46:55 +02:00
parent b15a13eed3
commit 43a8009a56
3 changed files with 62 additions and 167 deletions
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201
core/string/ustring.cpp
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@@ -63,6 +63,17 @@ static _FORCE_INLINE_ char32_t lower_case(char32_t c) {
return (is_ascii_upper_case(c) ? (c + ('a' - 'A')) : c);
}
// Case-insensitive version of are_spans_equal
template <typename T1, typename T2>
static bool strings_equal_lower(const T1 *p_lhs_begin, const T2 *p_rhs_begin, size_t p_len) {
for (size_t i = 0; i < p_len; ++i) {
if (_find_lower(p_lhs_begin[i]) != _find_lower(p_rhs_begin[i])) {
return false;
}
}
return true;
}
Error String::parse_url(String &r_scheme, String &r_host, int &r_port, String &r_path, String &r_fragment) const {
// Splits the URL into scheme, host, port, path, fragment. Strip credentials when present.
String base = *this;
@@ -3043,41 +3054,7 @@ int String::find(const char *p_str, int p_from) const {
return find_char(*p_str, p_from); // Optimize with single-char find.
}
const char32_t *src = get_data();
if (str_len == 1) {
const char32_t needle = p_str[0];
for (int i = p_from; i < len; i++) {
if (src[i] == needle) {
return i;
}
}
} else {
for (int i = p_from; i <= (len - str_len); i++) {
bool found = true;
for (int j = 0; j < str_len; j++) {
int read_pos = i + j;
if (read_pos >= len) {
ERR_PRINT("read_pos>=length()");
return -1;
}
if (src[read_pos] != (char32_t)p_str[j]) {
found = false;
break;
}
}
if (found) {
return i;
}
}
}
return -1;
return span().find_sequence(Span((const unsigned char *)p_str, str_len), p_from);
}
int String::find_char(char32_t p_char, int p_from) const {
@@ -3110,35 +3087,20 @@ int String::findmk(const Vector<String> &p_keys, int p_from, int *r_key) const {
const char32_t *src = get_data();
for (int i = p_from; i < len; i++) {
bool found = true;
for (int k = 0; k < key_count; k++) {
found = true;
if (r_key) {
*r_key = k;
const int str_len = keys[k].length();
if (i + str_len > len) {
continue; // Can't find this key here.
}
const char32_t *cmp = keys[k].get_data();
int l = keys[k].length();
for (int j = 0; j < l; j++) {
int read_pos = i + j;
if (read_pos >= len) {
found = false;
break;
}
if (src[read_pos] != cmp[j]) {
found = false;
break;
const char32_t *str = keys[k].get_data();
if (are_spans_equal(src + i, str, str_len)) {
if (r_key) {
*r_key = k;
}
return i;
}
if (found) {
break;
}
}
if (found) {
return i;
}
}
@@ -3156,28 +3118,11 @@ int String::findn(const String &p_str, int p_from) const {
return -1; // Still out of bounds
}
const char32_t *srcd = get_data();
const char32_t *src = get_data();
const char32_t *str = p_str.get_data();
for (int i = p_from; i <= (len - str_len); i++) {
bool found = true;
for (int j = 0; j < str_len; j++) {
int read_pos = i + j;
if (read_pos >= len) {
ERR_PRINT("read_pos>=length()");
return -1;
}
char32_t src = _find_lower(srcd[read_pos]);
char32_t dst = _find_lower(p_str[j]);
if (src != dst) {
found = false;
break;
}
}
if (found) {
if (strings_equal_lower(src + i, str, str_len)) {
return i;
}
}
@@ -3196,28 +3141,10 @@ int String::findn(const char *p_str, int p_from) const {
return -1; // Still out of bounds
}
const char32_t *srcd = get_data();
const char32_t *src = get_data();
for (int i = p_from; i <= (len - str_len); i++) {
bool found = true;
for (int j = 0; j < str_len; j++) {
int read_pos = i + j;
if (read_pos >= len) {
ERR_PRINT("read_pos>=length()");
return -1;
}
char32_t src = _find_lower(srcd[read_pos]);
char32_t dst = _find_lower(p_str[j]);
if (src != dst) {
found = false;
break;
}
}
if (found) {
if (strings_equal_lower(src + i, p_str, str_len)) {
return i;
}
}
@@ -3255,31 +3182,12 @@ int String::rfind(const char *p_str, int p_from) const {
return -1; // Still out of bounds
}
const char32_t *source = get_data();
for (int i = p_from; i >= 0; i--) {
bool found = true;
for (int j = 0; j < str_len; j++) {
int read_pos = i + j;
if (read_pos >= length()) {
ERR_PRINT("read_pos>=length()");
return -1;
}
const char32_t key_needle = p_str[j];
if (source[read_pos] != key_needle) {
found = false;
break;
}
}
if (found) {
return i;
}
if (str_len == 1) {
// Optimize with single-char implementation.
return span().rfind(p_str[0], p_from);
}
return -1;
return span().rfind_sequence(Span((const unsigned char *)p_str, str_len), p_from);
}
int String::rfind_char(char32_t p_char, int p_from) const {
@@ -3303,28 +3211,16 @@ int String::rfindn(const String &p_str, int p_from) const {
return -1; // Still out of bounds
}
if (str_len == 1) {
// Optimize with single-char implementation.
return span().rfind(p_str[0], p_from);
}
const char32_t *src = get_data();
const char32_t *str = p_str.get_data();
for (int i = p_from; i >= 0; i--) {
bool found = true;
for (int j = 0; j < str_len; j++) {
int read_pos = i + j;
if (read_pos >= len) {
ERR_PRINT("read_pos>=length()");
return -1;
}
char32_t srcc = _find_lower(src[read_pos]);
char32_t dstc = _find_lower(p_str[j]);
if (srcc != dstc) {
found = false;
break;
}
}
if (found) {
if (strings_equal_lower(src + i, str, str_len)) {
return i;
}
}
@@ -3343,29 +3239,10 @@ int String::rfindn(const char *p_str, int p_from) const {
return -1; // Still out of bounds
}
const char32_t *source = get_data();
const char32_t *src = get_data();
for (int i = p_from; i >= 0; i--) {
bool found = true;
for (int j = 0; j < str_len; j++) {
int read_pos = i + j;
if (read_pos >= len) {
ERR_PRINT("read_pos>=length()");
return -1;
}
const char32_t key_needle = p_str[j];
int srcc = _find_lower(source[read_pos]);
int keyc = _find_lower(key_needle);
if (srcc != keyc) {
found = false;
break;
}
}
if (found) {
if (strings_equal_lower(src + i, p_str, str_len)) {
return i;
}
}