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Merge pull request #94558 from stuartcarnie/sgc/sprintf_allocations

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Reduce allocations in `String::sprintf`
This commit is contained in:
Rémi Verschelde 2024-08-16 10:34:28 +02:00
commit 70096c0e6a
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GPG key ID: C3336907360768E1
1 changed files with 14 additions and 9 deletions
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23
core/string/ustring.cpp
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@ -5361,6 +5361,11 @@ String String::lpad(int min_length, const String &character) const {
// "fish %s %d pie" % ["frog", 12]
// In case of an error, the string returned is the error description and "error" is true.
String String::sprintf(const Array &values, bool *error) const {
static const String ZERO("0");
static const String SPACE(" ");
static const String MINUS("-");
static const String PLUS("+");
String formatted;
char32_t *self = (char32_t *)get_data();
bool in_format = false;
@ -5383,7 +5388,7 @@ String String::sprintf(const Array &values, bool *error) const {
if (in_format) { // We have % - let's see what else we get.
switch (c) {
case '%': { // Replace %% with %
formatted += chr(c);
formatted += c;
in_format = false;
break;
}
@ -5433,7 +5438,7 @@ String String::sprintf(const Array &values, bool *error) const {
// Padding.
int pad_chars_count = (negative || show_sign) ? min_chars - 1 : min_chars;
String pad_char = pad_with_zeros ? String("0") : String(" ");
const String &pad_char = pad_with_zeros ? ZERO : SPACE;
if (left_justified) {
str = str.rpad(pad_chars_count, pad_char);
} else {
@ -5442,7 +5447,7 @@ String String::sprintf(const Array &values, bool *error) const {
// Sign.
if (show_sign || negative) {
String sign_char = negative ? "-" : "+";
const String &sign_char = negative ? MINUS : PLUS;
if (left_justified) {
str = str.insert(0, sign_char);
} else {
@ -5479,7 +5484,7 @@ String String::sprintf(const Array &values, bool *error) const {
// Padding. Leave room for sign later if required.
int pad_chars_count = (is_negative || show_sign) ? min_chars - 1 : min_chars;
String pad_char = (pad_with_zeros && is_finite) ? String("0") : String(" "); // Never pad NaN or inf with zeros
const String &pad_char = (pad_with_zeros && is_finite) ? ZERO : SPACE; // Never pad NaN or inf with zeros
if (left_justified) {
str = str.rpad(pad_chars_count, pad_char);
} else {
@ -5488,7 +5493,7 @@ String String::sprintf(const Array &values, bool *error) const {
// Add sign if needed.
if (show_sign || is_negative) {
String sign_char = is_negative ? "-" : "+";
const String &sign_char = is_negative ? MINUS : PLUS;
if (left_justified) {
str = str.insert(0, sign_char);
} else {
@ -5541,7 +5546,7 @@ String String::sprintf(const Array &values, bool *error) const {
// Padding. Leave room for sign later if required.
int pad_chars_count = val < 0 ? min_chars - 1 : min_chars;
String pad_char = (pad_with_zeros && is_finite) ? String("0") : String(" "); // Never pad NaN or inf with zeros
const String &pad_char = (pad_with_zeros && is_finite) ? ZERO : SPACE; // Never pad NaN or inf with zeros
if (left_justified) {
number_str = number_str.rpad(pad_chars_count, pad_char);
} else {
@ -5551,9 +5556,9 @@ String String::sprintf(const Array &values, bool *error) const {
// Add sign if needed.
if (val < 0) {
if (left_justified) {
number_str = number_str.insert(0, "-");
number_str = number_str.insert(0, MINUS);
} else {
number_str = number_str.insert(pad_with_zeros ? 0 : number_str.length() - initial_len, "-");
number_str = number_str.insert(pad_with_zeros ? 0 : number_str.length() - initial_len, MINUS);
}
}
@ -5718,7 +5723,7 @@ String String::sprintf(const Array &values, bool *error) const {
in_decimals = false;
break;
default:
formatted += chr(c);
formatted += c;
}
}
}