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The n specifier for ranges.

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This commit is contained in:
Barry Revzin 2022-07-09 01:20:31 -05:00
parent b761f1279e
commit 8632c30404
2 changed files with 11 additions and 3 deletions
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12
include/fmt/ranges.h
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@ -415,6 +415,7 @@ struct formatter<
detail::range_formatter_type<Char, detail::uncvref_type<range_type>>;
formatter_type underlying_;
bool custom_specs_ = false;
bool use_brackets_ = true;
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
@ -422,8 +423,13 @@ struct formatter<
auto end = ctx.end();
if (it == end || *it == '}') return it;
if (*it == 'n') {
use_brackets_ = false;
++it;
}
if (*it != ':')
FMT_THROW(format_error("no top-level range formatters supported"));
FMT_THROW(format_error("no other top-level range formatters supported"));
custom_specs_ = true;
++it;
@ -438,7 +444,7 @@ struct formatter<
Char postfix = detail::is_set<R>::value ? '}' : ']';
detail::range_mapper<buffer_context<Char>> mapper;
auto out = ctx.out();
*out++ = prefix;
if (use_brackets_) *out++ = prefix;
int i = 0;
auto it = detail::range_begin(range);
auto end = detail::range_end(range);
@ -452,7 +458,7 @@ struct formatter<
}
++i;
}
*out++ = postfix;
if (use_brackets_) *out++ = postfix;
return out;
}
};

2
test/ranges-test.cc
View File

@ -47,12 +47,14 @@ TEST(ranges_test, format_vector) {
auto v = std::vector<int>{1, 2, 3, 5, 7, 11};
EXPECT_EQ(fmt::format("{}", v), "[1, 2, 3, 5, 7, 11]");
EXPECT_EQ(fmt::format("{::#x}", v), "[0x1, 0x2, 0x3, 0x5, 0x7, 0xb]");
EXPECT_EQ(fmt::format("{:n:#x}", v), "0x1, 0x2, 0x3, 0x5, 0x7, 0xb");
}
TEST(ranges_test, format_vector2) {
auto v = std::vector<std::vector<int>>{{1, 2}, {3, 5}, {7, 11}};
EXPECT_EQ(fmt::format("{}", v), "[[1, 2], [3, 5], [7, 11]]");
EXPECT_EQ(fmt::format("{:::#x}", v), "[[0x1, 0x2], [0x3, 0x5], [0x7, 0xb]]");
EXPECT_EQ(fmt::format("{:n:n:#x}", v), "0x1, 0x2, 0x3, 0x5, 0x7, 0xb");
}
TEST(ranges_test, format_map) {