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fmt,cxxrtl: add support for NUMERIC justification.

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Before this commit, the existing alignments were `LEFT` and `RIGHT`,
which added the `padding` character to the right and left just before
finishing formatting. However, if `padding == '0'` and the alignment is
to the right, then the padding character (digit zero) was added after
the sign, if one is present.

After this commit, the special case for `padding == '0'` is removed,
and the new justification `NUMERIC` adds the padding character like
the justification `RIGHT`, except after the sign, if one is present.
(Space, for the `SPACE_MINUS` sign mode, counts as the sign.)
This commit is contained in:
Catherine 2024-03-28 07:23:09 +00:00 • committed by Marcelina Kościelnicka
parent 6d6b138607
commit 1780e2eb1e
3 changed files with 21 additions and 8 deletions
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5
backends/cxxrtl/runtime/cxxrtl/cxxrtl.h
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@ -1026,6 +1026,7 @@ struct fmt_part {
enum {
RIGHT = 0,
LEFT = 1,
NUMERIC = 2,
} justify; // = RIGHT;
char padding; // = '\0';
size_t width; // = 0;
@ -1131,9 +1132,9 @@ struct fmt_part {
std::string str;
assert(width == 0 || padding != '\0');
if (justify == RIGHT && buf.size() < width) {
if (justify != LEFT && buf.size() < width) {
size_t pad_width = width - buf.size();
if (padding == '0' && (buf.front() == '+' || buf.front() == '-')) {
if (justify == NUMERIC && (buf.front() == '+' || buf.front() == '-' || buf.front() == ' ')) {
str += buf.front();
buf.erase(0, 1);
}