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author | Abseil Team <absl-team@google.com> | 2020-02-25 22:27:31 +0100 |
---|---|---|
committer | CJ Johnson <johnsoncj@google.com> | 2020-02-25 17:56:58 -0500 |
commit | b832dce8489ef7b6231384909fd9b68d5a5ff2b7 (patch) | |
tree | 3ad4be9a9a4105366be714da9458e076a77be18f /absl/strings/internal/str_format/extension.h | |
parent | aa844899c937bde5d2b24f276b59997e5b668bde (diff) |
Creation of LTS branch "lts_2020_02_25"20200225
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GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421
Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7
Diffstat (limited to 'absl/strings/internal/str_format/extension.h')
-rw-r--r-- | absl/strings/internal/str_format/extension.h | 366 |
1 files changed, 184 insertions, 182 deletions
diff --git a/absl/strings/internal/str_format/extension.h b/absl/strings/internal/str_format/extension.h index 4fbe4a06..d1665753 100644 --- a/absl/strings/internal/str_format/extension.h +++ b/absl/strings/internal/str_format/extension.h @@ -17,19 +17,18 @@ #define ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_ #include <limits.h> + #include <cstddef> #include <cstring> #include <ostream> +#include "absl/base/config.h" #include "absl/base/port.h" #include "absl/strings/internal/str_format/output.h" #include "absl/strings/string_view.h" -class Cord; - namespace absl { -inline namespace lts_2019_08_08 { - +ABSL_NAMESPACE_BEGIN namespace str_format_internal { class FormatRawSinkImpl { @@ -137,56 +136,8 @@ struct Flags { } }; -struct LengthMod { - public: - enum Id : uint8_t { - h, hh, l, ll, L, j, z, t, q, none - }; - static const size_t kNumValues = none + 1; - - LengthMod() : id_(none) {} - - // Index into the opaque array of LengthMod enums. - // Requires: i < kNumValues - static LengthMod FromIndex(size_t i) { - return LengthMod(kSpecs[i].value); - } - - static LengthMod FromId(Id id) { return LengthMod(id); } - - // The length modifier std::string associated with a specified LengthMod. - string_view name() const { - const Spec& spec = kSpecs[id_]; - return {spec.name, spec.name_length}; - } - - Id id() const { return id_; } - - friend bool operator==(const LengthMod& a, const LengthMod& b) { - return a.id() == b.id(); - } - friend bool operator!=(const LengthMod& a, const LengthMod& b) { - return !(a == b); - } - friend std::ostream& operator<<(std::ostream& os, const LengthMod& v) { - return os << v.name(); - } - - private: - struct Spec { - Id value; - const char *name; - size_t name_length; - }; - static const Spec kSpecs[]; - - explicit LengthMod(Id id) : id_(id) {} - - Id id_; -}; - // clang-format off -#define ABSL_CONVERSION_CHARS_EXPAND_(X_VAL, X_SEP) \ +#define ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(X_VAL, X_SEP) \ /* text */ \ X_VAL(c) X_SEP X_VAL(C) X_SEP X_VAL(s) X_SEP X_VAL(S) X_SEP \ /* ints */ \ @@ -197,121 +148,135 @@ struct LengthMod { X_VAL(g) X_SEP X_VAL(G) X_SEP X_VAL(a) X_SEP X_VAL(A) X_SEP \ /* misc */ \ X_VAL(n) X_SEP X_VAL(p) -// clang-format on -struct ConversionChar { - public: - enum Id : uint8_t { +enum class FormatConversionChar : uint8_t { c, C, s, S, // text d, i, o, u, x, X, // int f, F, e, E, g, G, a, A, // float n, p, // misc - none - }; - static const size_t kNumValues = none + 1; - - ConversionChar() : id_(none) {} - - public: - // Index into the opaque array of ConversionChar enums. - // Requires: i < kNumValues - static ConversionChar FromIndex(size_t i) { - return ConversionChar(kSpecs[i].value); - } + kNone, + none = kNone +}; +// clang-format on - static ConversionChar FromChar(char c) { - ConversionChar::Id out_id = ConversionChar::none; - switch (c) { -#define X_VAL(id) \ - case #id[0]: \ - out_id = ConversionChar::id; \ - break; - ABSL_CONVERSION_CHARS_EXPAND_(X_VAL, ) -#undef X_VAL - default: - break; - } - return ConversionChar(out_id); +inline FormatConversionChar FormatConversionCharFromChar(char c) { + switch (c) { +#define ABSL_INTERNAL_X_VAL(id) \ + case #id[0]: \ + return FormatConversionChar::id; + ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_X_VAL, ) +#undef ABSL_INTERNAL_X_VAL } + return FormatConversionChar::kNone; +} - static ConversionChar FromId(Id id) { return ConversionChar(id); } - Id id() const { return id_; } - - int radix() const { - switch (id()) { - case x: case X: case a: case A: case p: return 16; - case o: return 8; - default: return 10; - } +inline int FormatConversionCharRadix(FormatConversionChar c) { + switch (c) { + case FormatConversionChar::x: + case FormatConversionChar::X: + case FormatConversionChar::a: + case FormatConversionChar::A: + case FormatConversionChar::p: + return 16; + case FormatConversionChar::o: + return 8; + default: + return 10; } +} - bool upper() const { - switch (id()) { - case X: case F: case E: case G: case A: return true; - default: return false; - } +inline bool FormatConversionCharIsUpper(FormatConversionChar c) { + switch (c) { + case FormatConversionChar::X: + case FormatConversionChar::F: + case FormatConversionChar::E: + case FormatConversionChar::G: + case FormatConversionChar::A: + return true; + default: + return false; } +} - bool is_signed() const { - switch (id()) { - case d: case i: return true; - default: return false; - } +inline bool FormatConversionCharIsSigned(FormatConversionChar c) { + switch (c) { + case FormatConversionChar::d: + case FormatConversionChar::i: + return true; + default: + return false; } +} - bool is_integral() const { - switch (id()) { - case d: case i: case u: case o: case x: case X: - return true; - default: return false; - } +inline bool FormatConversionCharIsIntegral(FormatConversionChar c) { + switch (c) { + case FormatConversionChar::d: + case FormatConversionChar::i: + case FormatConversionChar::u: + case FormatConversionChar::o: + case FormatConversionChar::x: + case FormatConversionChar::X: + return true; + default: + return false; } +} - bool is_float() const { - switch (id()) { - case a: case e: case f: case g: case A: case E: case F: case G: - return true; - default: return false; - } +inline bool FormatConversionCharIsFloat(FormatConversionChar c) { + switch (c) { + case FormatConversionChar::a: + case FormatConversionChar::e: + case FormatConversionChar::f: + case FormatConversionChar::g: + case FormatConversionChar::A: + case FormatConversionChar::E: + case FormatConversionChar::F: + case FormatConversionChar::G: + return true; + default: + return false; } +} - bool IsValid() const { return id() != none; } - - // The associated char. - char Char() const { return kSpecs[id_].name; } - - friend bool operator==(const ConversionChar& a, const ConversionChar& b) { - return a.id() == b.id(); - } - friend bool operator!=(const ConversionChar& a, const ConversionChar& b) { - return !(a == b); +inline char FormatConversionCharToChar(FormatConversionChar c) { + switch (c) { +#define ABSL_INTERNAL_X_VAL(e) \ + case FormatConversionChar::e: \ + return #e[0]; +#define ABSL_INTERNAL_X_SEP + ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_X_VAL, + ABSL_INTERNAL_X_SEP) + case FormatConversionChar::kNone: + return '\0'; +#undef ABSL_INTERNAL_X_VAL +#undef ABSL_INTERNAL_X_SEP } - friend std::ostream& operator<<(std::ostream& os, const ConversionChar& v) { - char c = v.Char(); - if (!c) c = '?'; - return os << c; - } - - private: - struct Spec { - Id value; - char name; - }; - static const Spec kSpecs[]; + return '\0'; +} - explicit ConversionChar(Id id) : id_(id) {} +// The associated char. +inline std::ostream& operator<<(std::ostream& os, FormatConversionChar v) { + char c = FormatConversionCharToChar(v); + if (!c) c = '?'; + return os << c; +} - Id id_; -}; +struct FormatConversionSpecImplFriend; -class ConversionSpec { +class FormatConversionSpec { public: - Flags flags() const { return flags_; } - LengthMod length_mod() const { return length_mod_; } - ConversionChar conv() const { + // Width and precison are not specified, no flags are set. + bool is_basic() const { return flags_.basic; } + bool has_left_flag() const { return flags_.left; } + bool has_show_pos_flag() const { return flags_.show_pos; } + bool has_sign_col_flag() const { return flags_.sign_col; } + bool has_alt_flag() const { return flags_.alt; } + bool has_zero_flag() const { return flags_.zero; } + + FormatConversionChar conversion_char() const { // Keep this field first in the struct . It generates better code when // accessing it when ConversionSpec is passed by value in registers. - static_assert(offsetof(ConversionSpec, conv_) == 0, ""); + static_assert(offsetof(FormatConversionSpec, conv_) == 0, ""); return conv_; } @@ -322,46 +287,71 @@ class ConversionSpec { // negative value. int precision() const { return precision_; } - void set_flags(Flags f) { flags_ = f; } - void set_length_mod(LengthMod lm) { length_mod_ = lm; } - void set_conv(ConversionChar c) { conv_ = c; } - void set_width(int w) { width_ = w; } - void set_precision(int p) { precision_ = p; } - void set_left(bool b) { flags_.left = b; } + // Deprecated (use has_x_flag() instead). + Flags flags() const { return flags_; } + // Deprecated + FormatConversionChar conv() const { return conversion_char(); } private: - ConversionChar conv_; + friend struct str_format_internal::FormatConversionSpecImplFriend; + FormatConversionChar conv_ = FormatConversionChar::kNone; Flags flags_; - LengthMod length_mod_; int width_; int precision_; }; -constexpr uint64_t ConversionCharToConvValue(char conv) { +struct FormatConversionSpecImplFriend final { + static void SetFlags(Flags f, FormatConversionSpec* conv) { + conv->flags_ = f; + } + static void SetConversionChar(FormatConversionChar c, + FormatConversionSpec* conv) { + conv->conv_ = c; + } + static void SetWidth(int w, FormatConversionSpec* conv) { conv->width_ = w; } + static void SetPrecision(int p, FormatConversionSpec* conv) { + conv->precision_ = p; + } + static std::string FlagsToString(const FormatConversionSpec& spec) { + return spec.flags_.ToString(); + } +}; + +constexpr uint64_t FormatConversionCharToConvValue(char conv) { return -#define CONV_SET_CASE(c) \ - conv == #c[0] ? (uint64_t{1} << (1 + ConversionChar::Id::c)): - ABSL_CONVERSION_CHARS_EXPAND_(CONV_SET_CASE, ) -#undef CONV_SET_CASE +#define ABSL_INTERNAL_CHAR_SET_CASE(c) \ + conv == #c[0] \ + ? (uint64_t{1} << (1 + static_cast<uint8_t>(FormatConversionChar::c))) \ + : + ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_CHAR_SET_CASE, ) +#undef ABSL_INTERNAL_CHAR_SET_CASE conv == '*' ? 1 : 0; } -enum class Conv : uint64_t { -#define CONV_SET_CASE(c) c = ConversionCharToConvValue(#c[0]), - ABSL_CONVERSION_CHARS_EXPAND_(CONV_SET_CASE, ) -#undef CONV_SET_CASE +enum class FormatConversionCharSet : uint64_t { +#define ABSL_INTERNAL_CHAR_SET_CASE(c) \ + c = FormatConversionCharToConvValue(#c[0]), + ABSL_INTERNAL_CONVERSION_CHARS_EXPAND_(ABSL_INTERNAL_CHAR_SET_CASE, ) +#undef ABSL_INTERNAL_CHAR_SET_CASE // Used for width/precision '*' specification. - star = ConversionCharToConvValue('*'), - + kStar = FormatConversionCharToConvValue('*'), // Some predefined values: - integral = d | i | u | o | x | X, - floating = a | e | f | g | A | E | F | G, - numeric = integral | floating, - string = s, - pointer = p + kIntegral = d | i | u | o | x | X, + kFloating = a | e | f | g | A | E | F | G, + kNumeric = kIntegral | kFloating, + kString = s, + kPointer = p, + + // The following are deprecated + star = kStar, + integral = kIntegral, + floating = kFloating, + numeric = kNumeric, + string = kString, + pointer = kPointer }; // Type safe OR operator. @@ -369,45 +359,57 @@ enum class Conv : uint64_t { // 1. operator| on enums makes them decay to integers and the result is an // integer. We need the result to stay as an enum. // 2. We use "enum class" which would not work even if we accepted the decay. -constexpr Conv operator|(Conv a, Conv b) { - return Conv(static_cast<uint64_t>(a) | static_cast<uint64_t>(b)); +constexpr FormatConversionCharSet operator|(FormatConversionCharSet a, + FormatConversionCharSet b) { + return FormatConversionCharSet(static_cast<uint64_t>(a) | + static_cast<uint64_t>(b)); } // Get a conversion with a single character in it. -constexpr Conv ConversionCharToConv(char c) { - return Conv(ConversionCharToConvValue(c)); +constexpr FormatConversionCharSet ConversionCharToConv(char c) { + return FormatConversionCharSet(FormatConversionCharToConvValue(c)); } // Checks whether `c` exists in `set`. -constexpr bool Contains(Conv set, char c) { - return (static_cast<uint64_t>(set) & ConversionCharToConvValue(c)) != 0; +constexpr bool Contains(FormatConversionCharSet set, char c) { + return (static_cast<uint64_t>(set) & FormatConversionCharToConvValue(c)) != 0; } // Checks whether all the characters in `c` are contained in `set` -constexpr bool Contains(Conv set, Conv c) { +constexpr bool Contains(FormatConversionCharSet set, + FormatConversionCharSet c) { return (static_cast<uint64_t>(set) & static_cast<uint64_t>(c)) == static_cast<uint64_t>(c); } // Return type of the AbslFormatConvert() functions. -// The Conv template parameter is used to inform the framework of what -// conversion characters are supported by that AbslFormatConvert routine. -template <Conv C> -struct ConvertResult { - static constexpr Conv kConv = C; +// The FormatConversionCharSet template parameter is used to inform the +// framework of what conversion characters are supported by that +// AbslFormatConvert routine. +template <FormatConversionCharSet C> +struct FormatConvertResult { + static constexpr FormatConversionCharSet kConv = C; bool value; }; -template <Conv C> -constexpr Conv ConvertResult<C>::kConv; + +template <FormatConversionCharSet C> +constexpr FormatConversionCharSet FormatConvertResult<C>::kConv; // Return capacity - used, clipped to a minimum of 0. inline size_t Excess(size_t used, size_t capacity) { return used < capacity ? capacity - used : 0; } +// Type alias for use during migration. +using ConversionChar = FormatConversionChar; +using ConversionSpec = FormatConversionSpec; +using Conv = FormatConversionCharSet; +template <FormatConversionCharSet C> +using ConvertResult = FormatConvertResult<C>; + } // namespace str_format_internal -} // inline namespace lts_2019_08_08 +ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_ |