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Diagnose invalid precision

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This commit is contained in:
Victor Zverovich 2024-07-27 09:54:40 -07:00
parent 707d7d923a
commit a80d668a52
4 changed files with 36 additions and 28 deletions
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42
include/fmt/base.h
View File

@ -2323,7 +2323,7 @@ template <typename Char> struct dynamic_spec_id_handler {
}
};
// Parses [integer | "{" [arg_id] "}"].
// Parses integer | "{" [arg_id] "}".
template <typename Char>
FMT_CONSTEXPR auto parse_dynamic_spec(const Char* begin, const Char* end,
int& value, arg_ref<Char>& ref,
@ -2332,24 +2332,24 @@ FMT_CONSTEXPR auto parse_dynamic_spec(const Char* begin, const Char* end,
FMT_ASSERT(begin != end, "");
if ('0' <= *begin && *begin <= '9') {
int val = parse_nonnegative_int(begin, end, -1);
if (val != -1)
value = val;
else
report_error("number is too big");
} else if (*begin == '{') {
++begin;
if (begin != end) {
Char c = *begin;
if (c == '}' || c == ':') {
int id = ctx.next_arg_id();
ref = arg_ref<Char>(id);
ctx.check_dynamic_spec(id);
} else {
begin =
parse_arg_id(begin, end, dynamic_spec_id_handler<Char>{ctx, ref});
if (val == -1) report_error("number is too big");
value = val;
} else {
if (*begin == '{') {
++begin;
if (begin != end) {
Char c = *begin;
if (c == '}' || c == ':') {
int id = ctx.next_arg_id();
ref = arg_ref<Char>(id);
ctx.check_dynamic_spec(id);
} else {
begin =
parse_arg_id(begin, end, dynamic_spec_id_handler<Char>{ctx, ref});
}
}
if (begin != end && *begin == '}') return ++begin;
}
if (begin != end && *begin == '}') return ++begin;
report_error("invalid format string");
}
return begin;
@ -2361,11 +2361,9 @@ FMT_CONSTEXPR auto parse_precision(const Char* begin, const Char* end,
basic_format_parse_context<Char>& ctx)
-> const Char* {
++begin;
if (begin == end || *begin == '}') {
report_error("invalid precision");
return begin;
}
return parse_dynamic_spec(begin, end, value, ref, ctx);
if (begin != end) begin = parse_dynamic_spec(begin, end, value, ref, ctx);
else report_error("invalid precision");
return begin;
}
enum class state { start, align, sign, hash, zero, width, precision, locale };

14
include/fmt/chrono.h
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@ -2251,8 +2251,11 @@ struct formatter<std::chrono::duration<Rep, Period>, Char> {
it = detail::parse_align(it, end, specs_);
if (it == end) return it;
it = detail::parse_dynamic_spec(it, end, specs_.width, width_ref_, ctx);
if (it == end) return it;
Char c = *it;
if ((c >= '0' && c <= '9') || c == '{') {
it = detail::parse_dynamic_spec(it, end, specs_.width, width_ref_, ctx);
if (it == end) return it;
}
auto checker = detail::chrono_format_checker();
if (*it == '.') {
@ -2410,8 +2413,11 @@ template <typename Char> struct formatter<std::tm, Char> {
it = detail::parse_align(it, end, specs_);
if (it == end) return it;
it = detail::parse_dynamic_spec(it, end, specs_.width, width_ref_, ctx);
if (it == end) return it;
Char c = *it;
if ((c >= '0' && c <= '9') || c == '{') {
it = detail::parse_dynamic_spec(it, end, specs_.width, width_ref_, ctx);
if (it == end) return it;
}
end = detail::parse_chrono_format(it, end, detail::tm_format_checker());
// Replace the default format_str only if the new spec is not empty.

4
include/fmt/std.h
View File

@ -129,7 +129,9 @@ template <typename Char> struct formatter<std::filesystem::path, Char> {
it = detail::parse_align(it, end, specs_);
if (it == end) return it;
it = detail::parse_dynamic_spec(it, end, specs_.width, width_ref_, ctx);
Char c = *it;
if ((c >= '0' && c <= '9') || c == '{')
it = detail::parse_dynamic_spec(it, end, specs_.width, width_ref_, ctx);
if (it != end && *it == '?') {
debug_ = true;
++it;

4
test/format-test.cc
View File

@ -945,7 +945,7 @@ TEST(format_test, precision) {
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:."), 0.0), format_error,
"invalid precision");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.}"), 0.0), format_error,
"invalid precision");
"invalid format string");
EXPECT_THROW_MSG((void)fmt::format(runtime("{0:.2"), 0), format_error,
"invalid format specifier");
@ -1066,6 +1066,8 @@ TEST(format_test, precision) {
EXPECT_THROW_MSG(
(void)fmt::format("{:.2147483646f}", -2.2121295195081227E+304),
format_error, "number is too big");
EXPECT_THROW_MSG((void)fmt::format(runtime("{:.f}"), 42.0), format_error,
"invalid format string");
EXPECT_EQ(fmt::format("{0:.2}", "str"), "st");
EXPECT_EQ(fmt::format("{0:.5}", "вожыкі"), "вожык");