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Implement compile-time checks for dynamic width/precision type

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This commit is contained in:
Victor Zverovich 2022-06-09 17:59:27 -07:00
parent bc5c7c50fd
commit 48e0a59222
3 changed files with 23 additions and 3 deletions
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24
include/fmt/core.h
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@ -710,8 +710,8 @@ class basic_format_parse_context : private ErrorHandler {
next_arg_id_ = -1;
do_check_arg_id(id);
}
FMT_CONSTEXPR void check_arg_id(basic_string_view<Char>) {}
FMT_CONSTEXPR void check_dynamic_spec(int arg_id);
FMT_CONSTEXPR void on_error(const char* message) {
ErrorHandler::on_error(message);
@ -738,7 +738,8 @@ class compile_parse_context
ErrorHandler eh = {}, int next_arg_id = 0)
: base(format_str, eh, next_arg_id), num_args_(num_args), types_(types) {}
constexpr int num_args() const { return num_args_; }
constexpr auto num_args() const -> int { return num_args_; }
constexpr auto arg_type(int id) const -> type { return types_[id]; }
FMT_CONSTEXPR auto next_arg_id() -> int {
int id = base::next_arg_id();
@ -751,6 +752,11 @@ class compile_parse_context
if (id >= num_args_) this->on_error("argument not found");
}
using base::check_arg_id;
FMT_CONSTEXPR void check_dynamic_spec(int arg_id) {
if (arg_id < num_args_ && types_ && !is_integral_type(types_[arg_id]))
this->on_error("width/precision is not integer");
}
};
FMT_END_DETAIL_NAMESPACE
@ -766,6 +772,15 @@ basic_format_parse_context<Char, ErrorHandler>::do_check_arg_id(int id) {
}
}
template <typename Char, typename ErrorHandler>
FMT_CONSTEXPR void
basic_format_parse_context<Char, ErrorHandler>::check_dynamic_spec(int arg_id) {
if (detail::is_constant_evaluated()) {
using context = detail::compile_parse_context<Char, ErrorHandler>;
static_cast<context*>(this)->check_dynamic_spec(arg_id);
}
}
template <typename Context> class basic_format_arg;
template <typename Context> class basic_format_args;
template <typename Context> class dynamic_format_arg_store;
@ -2243,11 +2258,14 @@ class dynamic_specs_handler
FMT_CONSTEXPR auto make_arg_ref(int arg_id) -> arg_ref_type {
context_.check_arg_id(arg_id);
context_.check_dynamic_spec(arg_id);
return arg_ref_type(arg_id);
}
FMT_CONSTEXPR auto make_arg_ref(auto_id) -> arg_ref_type {
return arg_ref_type(context_.next_arg_id());
int arg_id = context_.next_arg_id();
context_.check_dynamic_spec(arg_id);
return arg_ref_type(arg_id);
}
FMT_CONSTEXPR auto make_arg_ref(basic_string_view<char_type> arg_id)

1
test/core-test.cc
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@ -584,6 +584,7 @@ struct test_parse_context {
constexpr int next_arg_id() { return 11; }
template <typename Id> FMT_CONSTEXPR void check_arg_id(Id) {}
FMT_CONSTEXPR void check_dynamic_spec(int) {}
constexpr const char* begin() { return nullptr; }
constexpr const char* end() { return nullptr; }

1
test/format-test.cc
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@ -2177,6 +2177,7 @@ TEST(format_test, format_string_errors) {
EXPECT_ERROR("{: }", "format specifier requires signed argument", unsigned);
EXPECT_ERROR("{:{}}", "argument not found", int);
EXPECT_ERROR("{:.{}}", "argument not found", double);
EXPECT_ERROR("{:{}}", "width/precision is not integer", int, double);
EXPECT_ERROR("{:.2}", "precision not allowed for this argument type", int);
EXPECT_ERROR("{:s}", "invalid type specifier", int);
EXPECT_ERROR("{:s}", "invalid type specifier", char);