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Fix handling of dynamic width in chrono formatter

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Thanks to Howard Hinnant.
This commit is contained in:
Victor Zverovich 2019-01-09 15:13:29 -08:00
parent f5cc77cea0
commit dc8f8ce4c0
2 changed files with 9 additions and 4 deletions
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11
include/fmt/chrono.h
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@ -18,7 +18,7 @@
FMT_BEGIN_NAMESPACE
namespace internal{
namespace internal {
enum class numeric_system {
standard,
@ -415,7 +415,8 @@ struct formatter<std::chrono::duration<Rep, Period>, Char> {
if (begin == end) return begin;
begin = internal::parse_width(begin, end, handler);
end = parse_chrono_format(begin, end, internal::chrono_format_checker());
format_str = basic_string_view<Char>(&*begin, internal::to_unsigned(end - begin));
format_str = basic_string_view<Char>(
&*begin, internal::to_unsigned(end - begin));
return end;
}
@ -423,6 +424,8 @@ struct formatter<std::chrono::duration<Rep, Period>, Char> {
auto format(const duration &d, FormatContext &ctx)
-> decltype(ctx.out()) {
auto begin = format_str.begin(), end = format_str.end();
// As a possible future optimization, we could avoid extra copying if width
// is not specified.
memory_buffer buf;
typedef output_range<decltype(ctx.out()), Char> range;
basic_writer<range> w(range(ctx.out()));
@ -433,8 +436,6 @@ struct formatter<std::chrono::duration<Rep, Period>, Char> {
format_to(buf, "{}[{}]s", d.count(), Period::num);
else
format_to(buf, "{}[{}/{}]s", d.count(), Period::num, Period::den);
internal::handle_dynamic_spec<internal::width_checker>(
spec.width_, width_ref, ctx);
} else {
auto out = std::back_inserter(buf);
internal::chrono_formatter<FormatContext, decltype(out)> f(ctx, out);
@ -442,6 +443,8 @@ struct formatter<std::chrono::duration<Rep, Period>, Char> {
f.ms = std::chrono::duration_cast<std::chrono::milliseconds>(d - f.s);
parse_chrono_format(begin, end, f);
}
internal::handle_dynamic_spec<internal::width_checker>(
spec.width_, width_ref, ctx);
w.write(buf.data(), buf.size(), spec);
return w.out();
}

2
test/chrono-test.cc
View File

@ -103,6 +103,8 @@ TEST(ChronoTest, Align) {
fmt::format("{:>12%H:%M:%S}", std::chrono::seconds(12345)));
EXPECT_EQ("~~03:25:45~~",
fmt::format("{:~^12%H:%M:%S}", std::chrono::seconds(12345)));
EXPECT_EQ("03:25:45 ",
fmt::format("{:{}%H:%M:%S}", std::chrono::seconds(12345), 12));
}