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Implement precision for floating-point durations.

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The formatting syntax follows p1361r0, augmented by a precision field as proposed in #1004.

Signed-off-by: Daniela Engert <dani@ngrt.de>
This commit is contained in:
Daniela Engert
2019-01-12 14:31:55 +01:00
committed by Victor Zverovich
parent 7cdb1e5e40
commit 9f70b034e1
3 changed files with 92 additions and 27 deletions
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39
include/fmt/format.h
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@@ -1935,6 +1935,28 @@ FMT_CONSTEXPR const Char* parse_width(const Char* begin, const Char* end,
return begin;
}
template <typename Char, typename Handler>
FMT_CONSTEXPR const Char* parse_precision(const Char* begin, const Char* end,
Handler&& handler) {
++begin;
auto c = begin != end ? *begin : 0;
if ('0' <= c && c <= '9') {
handler.on_precision(parse_nonnegative_int(begin, end, handler));
} else if (c == '{') {
++begin;
if (begin != end) {
begin =
parse_arg_id(begin, end, precision_adapter<Handler, Char>(handler));
}
if (begin == end || *begin++ != '}')
return handler.on_error("invalid format string"), begin;
} else {
return handler.on_error("missing precision specifier"), begin;
}
handler.end_precision();
return begin;
}
// Parses standard format specifiers and sends notifications about parsed
// components to handler.
template <typename Char, typename SpecHandler>
@@ -1978,22 +2000,7 @@ FMT_CONSTEXPR const Char* parse_format_specs(const Char* begin, const Char* end,
// Parse precision.
if (*begin == '.') {
++begin;
auto c = begin != end ? *begin : 0;
if ('0' <= c && c <= '9') {
handler.on_precision(parse_nonnegative_int(begin, end, handler));
} else if (c == '{') {
++begin;
if (begin != end) {
begin = parse_arg_id(begin, end,
precision_adapter<SpecHandler, Char>(handler));
}
if (begin == end || *begin++ != '}')
return handler.on_error("invalid format string"), begin;
} else {
return handler.on_error("missing precision specifier"), begin;
}
handler.end_precision();
begin = parse_precision(begin, end, handler);
}
// Parse type.