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Enable zero padding with float specifier for format strings 

Godot currently supports zero padding for integers, octals and
hexadecimals when using format strings, but not for floats.

This commit adds support for zero padding for floats, thus ensuring
consistent behavior for all types, and making Godot's format specifiers'
behavior closer to c's `printf()`.

Before: `print("<%07.2f>" % -0.2345)` prints `<  -0.23>`.
Now: `print("<%07.2f>" % -0.2345)` prints `<-000.23>`.
     `print("<%7.2f>" % -0.2345)` prints `<  -0.23>`.
This commit is contained in:
Maganty Rushyendra 2020-06-03 19:47:47 +08:00
parent 901832e21c
commit b7d835d9ca
1 changed files with 23 additions and 10 deletions
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33
core/ustring.cpp
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@ -4143,27 +4143,40 @@ String String::sprintf(const Array &values, bool *error) const {
}
double value = values[value_index];
String str = String::num(value, min_decimals);
bool is_negative = (value < 0);
String str = String::num(abs(value), min_decimals);
// Pad decimals out.
str = str.pad_decimals(min_decimals);
// Show sign
if (show_sign && str.left(1) != "-") {
str = str.insert(0, "+");
int initial_len = str.length();
// 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_zeroes ? String("0") : String(" ");
if (left_justified) {
if (pad_with_zeroes) {
return "left justification cannot be used with zeros as the padding";
} else {
str = str.rpad(pad_chars_count, pad_char);
}
} else {
str = str.lpad(pad_chars_count, pad_char);
}
// Padding
if (left_justified) {
str = str.rpad(min_chars);
} else {
str = str.lpad(min_chars);
// Add sign if needed.
if (show_sign || is_negative) {
String sign_char = is_negative ? "-" : "+";
if (left_justified) {
str = str.insert(0, sign_char);
} else {
str = str.insert(pad_with_zeroes ? 0 : str.length() - initial_len, sign_char);
}
}
formatted += str;
++value_index;
in_format = false;
break;
}
case 's': { // String