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https://github.com/fmtlib/fmt.git
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Refactor float spec parsing
This commit is contained in:
Victor Zverovich
parent
ed117baa4f
commit
56a2e2075c
@ -70,6 +70,12 @@
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# define FMT_HAS_BUILTIN(x) 0
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#endif
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#if FMT_HAS_CPP_ATTRIBUTE(fallthrough) >= 201603 && __cplusplus >= 201703
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# define FMT_FALLTHROUGH [[fallthrough]]
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#else
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# define FMT_FALLTHROUGH
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#endif
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#ifndef FMT_THROW
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# if FMT_EXCEPTIONS
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# if FMT_MSC_VER
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@ -1053,9 +1059,18 @@ namespace internal {
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// A floating-point presentation format.
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enum class float_format {
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general, // General: shortest of exponential and fixed.
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exp, // Exponential: 1e42
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fixed // Fixed: 1.42
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shortest, // Shortest round-trip format.
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general, // General: exponent notation or fixed point based on magnitude.
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exp, // Exponent notation with the default precision of 6, e.g. 1.2e-3.
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fixed, // Fixed point with the default precision of 6, e.g. 0.0012.
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hex
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};
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struct float_spec {
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float_format format;
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bool upper;
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bool locale;
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bool percent;
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};
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struct gen_digits_params {
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@ -1244,36 +1259,48 @@ FMT_CONSTEXPR void handle_int_type_spec(char spec, Handler&& handler) {
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}
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}
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template <typename Handler>
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FMT_CONSTEXPR void handle_float_type_spec(char spec, Handler&& handler) {
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template <typename ErrorHandler = error_handler>
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FMT_CONSTEXPR float_spec parse_float_type_spec(char spec,
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ErrorHandler&& eh = {}) {
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auto result = float_spec();
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switch (spec) {
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case 'G':
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result.upper = true;
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FMT_FALLTHROUGH;
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case 0:
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case 'g':
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case 'G':
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handler.on_general();
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result.format = float_format::general;
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break;
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case 'e':
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case 'E':
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handler.on_exp();
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result.upper = true;
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FMT_FALLTHROUGH;
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case 'e':
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result.format = float_format::exp;
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break;
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case 'f':
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case 'F':
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handler.on_fixed();
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result.upper = true;
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FMT_FALLTHROUGH;
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case 'f':
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result.format = float_format::fixed;
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break;
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case '%':
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handler.on_percent();
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result.format = float_format::fixed;
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result.percent = true;
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break;
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case 'a':
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case 'A':
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handler.on_hex();
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result.upper = true;
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FMT_FALLTHROUGH;
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case 'a':
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result.format = float_format::hex;
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break;
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case 'n':
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handler.on_num();
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result.locale = true;
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break;
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default:
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handler.on_error();
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eh.on_error("invalid type specifier");
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break;
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}
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return result;
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}
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template <typename Char, typename Handler>
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@ -1321,68 +1348,6 @@ template <typename ErrorHandler> class int_type_checker : private ErrorHandler {
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}
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};
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template <typename ErrorHandler>
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class float_type_checker : private ErrorHandler {
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public:
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FMT_CONSTEXPR explicit float_type_checker(ErrorHandler eh)
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: ErrorHandler(eh) {}
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FMT_CONSTEXPR void on_general() {}
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FMT_CONSTEXPR void on_exp() {}
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FMT_CONSTEXPR void on_fixed() {}
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FMT_CONSTEXPR void on_percent() {}
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FMT_CONSTEXPR void on_hex() {}
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FMT_CONSTEXPR void on_num() {}
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FMT_CONSTEXPR void on_error() {
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ErrorHandler::on_error("invalid type specifier");
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}
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};
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struct float_spec_handler {
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char type;
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bool upper;
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float_format format;
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bool as_percentage;
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bool use_locale;
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explicit float_spec_handler(char t)
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: type(t),
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upper(false),
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format(float_format::general),
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as_percentage(false),
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use_locale(false) {}
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void on_general() {
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if (type == 'G') upper = true;
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}
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void on_exp() {
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format = float_format::exp;
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if (type == 'E') upper = true;
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}
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void on_fixed() {
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format = float_format::fixed;
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if (type == 'F') upper = true;
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}
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void on_percent() {
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format = float_format::fixed;
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as_percentage = true;
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}
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void on_hex() {
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if (type == 'A') upper = true;
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}
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void on_num() { use_locale = true; }
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FMT_NORETURN void on_error() {
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FMT_THROW(format_error("invalid type specifier"));
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}
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};
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template <typename ErrorHandler>
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class char_specs_checker : public ErrorHandler {
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private:
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@ -2835,10 +2800,6 @@ template <typename Range>
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template <typename T, bool USE_GRISU>
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void internal::basic_writer<Range>::write_fp(T value,
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const format_specs& specs) {
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// Check type.
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float_spec_handler handler(specs.type);
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handle_float_type_spec(handler.type, handler);
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auto sign = specs.sign;
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// Use signbit instead of value < 0 since the latter is always false for NaN.
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if (std::signbit(value)) {
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@ -2848,20 +2809,20 @@ void internal::basic_writer<Range>::write_fp(T value,
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sign = sign::none;
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}
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float_spec fspec = parse_float_type_spec(specs.type);
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if (!std::isfinite(value)) {
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const char* str = std::isinf(value) ? (handler.upper ? "INF" : "inf")
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: (handler.upper ? "NAN" : "nan");
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return write_padded(specs,
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inf_or_nan_writer{sign, handler.as_percentage, str});
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const char* str = std::isinf(value) ? (fspec.upper ? "INF" : "inf")
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: (fspec.upper ? "NAN" : "nan");
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return write_padded(specs, inf_or_nan_writer{sign, fspec.percent, str});
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}
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if (handler.as_percentage) value *= 100;
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if (fspec.percent) value *= 100;
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memory_buffer buffer;
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int exp = 0;
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int precision = specs.precision >= 0 || !specs.type ? specs.precision : 6;
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unsigned options = 0;
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if (handler.format == float_format::fixed) options |= grisu_options::fixed;
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if (fspec.format == float_format::fixed) options |= grisu_options::fixed;
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if (const_check(sizeof(value) == sizeof(float)))
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options |= grisu_options::binary32;
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bool use_grisu =
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@ -2872,7 +2833,7 @@ void internal::basic_writer<Range>::write_fp(T value,
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char* decimal_point_pos = nullptr;
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if (!use_grisu) decimal_point_pos = sprintf_format(value, buffer, specs);
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if (handler.as_percentage) {
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if (fspec.percent) {
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buffer.push_back('%');
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--exp; // Adjust decimal place position.
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}
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@ -2888,17 +2849,17 @@ void internal::basic_writer<Range>::write_fp(T value,
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} else if (specs.align == align::none) {
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as.align = align::right;
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}
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char_type decimal_point = handler.use_locale
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char_type decimal_point = fspec.locale
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? internal::decimal_point<char_type>(locale_)
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: static_cast<char_type>('.');
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if (use_grisu) {
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auto params = gen_digits_params();
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params.sign = sign;
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params.format = handler.format;
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params.format = fspec.format;
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params.num_digits = precision;
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params.trailing_zeros =
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(precision != 0 &&
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(handler.format == float_format::fixed || !specs.type)) ||
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(fspec.format == float_format::fixed || !specs.type)) ||
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specs.alt;
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int num_digits = static_cast<int>(buffer.size());
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write_padded(as, grisu_writer<char_type>(buffer.data(), num_digits, exp,
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@ -3078,8 +3039,7 @@ struct formatter<T, Char,
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case internal::float_type:
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case internal::double_type:
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case internal::long_double_type:
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handle_float_type_spec(specs_.type,
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internal::float_type_checker<decltype(eh)>(eh));
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internal::parse_float_type_spec(specs_.type, eh);
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break;
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case internal::cstring_type:
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internal::handle_cstring_type_spec(
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@ -666,8 +666,7 @@ struct formatter {
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break;
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case internal::double_type:
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case internal::long_double_type:
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handle_float_type_spec(type_spec,
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internal::float_type_checker<decltype(eh)>(eh));
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internal::parse_float_type_spec(type_spec, eh);
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break;
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case internal::cstring_type:
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internal::handle_cstring_type_spec(
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