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Make format_specs construction constexpr

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This commit is contained in:
Victor Zverovich
2017-10-22 08:18:26 -07:00
parent a38bd9ca24
commit 6b3840b73c
2 changed files with 84 additions and 40 deletions
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70
test/format-test.cc
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@@ -1619,7 +1619,7 @@ TEST(FormatTest, ConstexprParseArgID) {
static_assert(parse_arg_id("!").res == test_arg_id_handler::ERROR, "");
}
struct test_format_specs_handlers {
struct test_format_specs_handler {
enum Result { NONE, PLUS, MINUS, SPACE, HASH, ZERO, ERROR };
Result res = NONE;
@@ -1656,24 +1656,62 @@ struct test_format_specs_handlers {
constexpr void on_error(const char *) { res = ERROR; }
};
constexpr test_format_specs_handlers parse_specs(const char *s) {
test_format_specs_handlers h;
constexpr test_format_specs_handler parse_test_specs(const char *s) {
test_format_specs_handler h;
fmt::internal::parse_format_specs(s, h);
return h;
}
TEST(FormatTest, ConstexprParseFormatSpecs) {
static_assert(parse_specs("<").align == fmt::ALIGN_LEFT, "");
static_assert(parse_specs("*^").fill == '*', "");
static_assert(parse_specs("+").res == test_format_specs_handlers::PLUS, "");
static_assert(parse_specs("-").res == test_format_specs_handlers::MINUS, "");
static_assert(parse_specs(" ").res == test_format_specs_handlers::SPACE, "");
static_assert(parse_specs("#").res == test_format_specs_handlers::HASH, "");
static_assert(parse_specs("0").res == test_format_specs_handlers::ZERO, "");
static_assert(parse_specs("42").width == 42, "");
static_assert(parse_specs("{42}").width_ref.index == 42, "");
static_assert(parse_specs(".42").precision == 42, "");
static_assert(parse_specs(".{42}").precision_ref.index == 42, "");
static_assert(parse_specs("d").type == 'd', "");
static_assert(parse_specs("{<").res == test_format_specs_handlers::ERROR, "");
using handler = test_format_specs_handler;
static_assert(parse_test_specs("<").align == fmt::ALIGN_LEFT, "");
static_assert(parse_test_specs("*^").fill == '*', "");
static_assert(parse_test_specs("+").res == handler::PLUS, "");
static_assert(parse_test_specs("-").res == handler::MINUS, "");
static_assert(parse_test_specs(" ").res == handler::SPACE, "");
static_assert(parse_test_specs("#").res == handler::HASH, "");
static_assert(parse_test_specs("0").res == handler::ZERO, "");
static_assert(parse_test_specs("42").width == 42, "");
static_assert(parse_test_specs("{42}").width_ref.index == 42, "");
static_assert(parse_test_specs(".42").precision == 42, "");
static_assert(parse_test_specs(".{42}").precision_ref.index == 42, "");
static_assert(parse_test_specs("d").type == 'd', "");
static_assert(parse_test_specs("{<").res == handler::ERROR, "");
}
struct test_context {
using char_type = char;
fmt::basic_arg<test_context> next_arg() {
return fmt::basic_arg<test_context>();
}
template <typename Id>
fmt::basic_arg<test_context> get_arg(Id) {
return fmt::basic_arg<test_context>();
}
template <typename Id>
void check_arg_id(Id) {}
};
constexpr fmt::format_specs parse_specs(const char *s) {
fmt::format_specs specs;
test_context ctx;
fmt::internal::specs_handler<test_context> h(specs, ctx);
parse_format_specs(s, h);
return specs;
}
TEST(FormatTest, ConstexprSpecsHandler) {
static_assert(parse_specs("<").align() == fmt::ALIGN_LEFT, "");
static_assert(parse_specs("*^").fill() == '*', "");
static_assert(parse_specs("+").flag(fmt::PLUS_FLAG), "");
static_assert(parse_specs("-").flag(fmt::MINUS_FLAG), "");
static_assert(parse_specs(" ").flag(fmt::SIGN_FLAG), "");
static_assert(parse_specs("#").flag(fmt::HASH_FLAG), "");
static_assert(parse_specs("0").align() == fmt::ALIGN_NUMERIC, "");
static_assert(parse_specs("42").width() == 42, "");
static_assert(parse_specs(".42").precision() == 42, "");
static_assert(parse_specs("d").type() == 'd', "");
}