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+++ b/absl/strings/internal/str_format/extension.h @@ -0,0 +1,414 @@ +// +// Copyright 2017 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// http://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// +#ifndef ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_ +#define ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_ + +#include +#include +#include +#include + +#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_2018_12_18 { + +namespace str_format_internal { + +class FormatRawSinkImpl { + public: + // Implicitly convert from any type that provides the hook function as + // described above. + template (), string_view()))* = nullptr> + FormatRawSinkImpl(T* raw) // NOLINT + : sink_(raw), write_(&FormatRawSinkImpl::Flush) {} + + void Write(string_view s) { write_(sink_, s); } + + template + static FormatRawSinkImpl Extract(T s) { + return s.sink_; + } + + private: + template + static void Flush(void* r, string_view s) { + str_format_internal::InvokeFlush(static_cast(r), s); + } + + void* sink_; + void (*write_)(void*, string_view); +}; + +// An abstraction to which conversions write their string data. +class FormatSinkImpl { + public: + explicit FormatSinkImpl(FormatRawSinkImpl raw) : raw_(raw) {} + + ~FormatSinkImpl() { Flush(); } + + void Flush() { + raw_.Write(string_view(buf_, pos_ - buf_)); + pos_ = buf_; + } + + void Append(size_t n, char c) { + if (n == 0) return; + size_ += n; + auto raw_append = [&](size_t count) { + memset(pos_, c, count); + pos_ += count; + }; + while (n > Avail()) { + n -= Avail(); + if (Avail() > 0) { + raw_append(Avail()); + } + Flush(); + } + raw_append(n); + } + + void Append(string_view v) { + size_t n = v.size(); + if (n == 0) return; + size_ += n; + if (n >= Avail()) { + Flush(); + raw_.Write(v); + return; + } + memcpy(pos_, v.data(), n); + pos_ += n; + } + + size_t size() const { return size_; } + + // Put 'v' to 'sink' with specified width, precision, and left flag. + bool PutPaddedString(string_view v, int w, int p, bool l); + + template + T Wrap() { + return T(this); + } + + template + static FormatSinkImpl* Extract(T* s) { + return s->sink_; + } + + private: + size_t Avail() const { return buf_ + sizeof(buf_) - pos_; } + + FormatRawSinkImpl raw_; + size_t size_ = 0; + char* pos_ = buf_; + char buf_[1024]; +}; + +struct Flags { + bool basic : 1; // fastest conversion: no flags, width, or precision + bool left : 1; // "-" + bool show_pos : 1; // "+" + bool sign_col : 1; // " " + bool alt : 1; // "#" + bool zero : 1; // "0" + std::string ToString() const; + friend std::ostream& operator<<(std::ostream& os, const Flags& v) { + return os << v.ToString(); + } +}; + +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) \ + /* text */ \ + X_VAL(c) X_SEP X_VAL(C) X_SEP X_VAL(s) X_SEP X_VAL(S) X_SEP \ + /* ints */ \ + X_VAL(d) X_SEP X_VAL(i) X_SEP X_VAL(o) X_SEP \ + X_VAL(u) X_SEP X_VAL(x) X_SEP X_VAL(X) X_SEP \ + /* floats */ \ + X_VAL(f) X_SEP X_VAL(F) X_SEP X_VAL(e) X_SEP X_VAL(E) X_SEP \ + 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 { + 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); + } + + 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); + } + + 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; + } + } + + bool upper() const { + switch (id()) { + case X: case F: case E: case G: case A: return true; + default: return false; + } + } + + bool is_signed() const { + switch (id()) { + case d: case 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; + } + } + + 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; + } + } + + 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); + } + 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[]; + + explicit ConversionChar(Id id) : id_(id) {} + + Id id_; +}; + +class ConversionSpec { + public: + Flags flags() const { return flags_; } + LengthMod length_mod() const { return length_mod_; } + ConversionChar conv() 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, ""); + return conv_; + } + + // Returns the specified width. If width is unspecfied, it returns a negative + // value. + int width() const { return width_; } + // Returns the specified precision. If precision is unspecfied, it returns a + // 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; } + + private: + ConversionChar conv_; + Flags flags_; + LengthMod length_mod_; + int width_; + int precision_; +}; + +constexpr uint64_t ConversionCharToConvValue(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 + 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 + + // Used for width/precision '*' specification. + star = ConversionCharToConvValue('*'), + + // Some predefined values: + integral = d | i | u | o | x | X, + floating = a | e | f | g | A | E | F | G, + numeric = integral | floating, + string = s, // absl:ignore(std::string) + pointer = p +}; + +// Type safe OR operator. +// We need this for two reasons: +// 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(a) | static_cast(b)); +} + +// Get a conversion with a single character in it. +constexpr Conv ConversionCharToConv(char c) { + return Conv(ConversionCharToConvValue(c)); +} + +// Checks whether `c` exists in `set`. +constexpr bool Contains(Conv set, char c) { + return (static_cast(set) & ConversionCharToConvValue(c)) != 0; +} + +// Checks whether all the characters in `c` are contained in `set` +constexpr bool Contains(Conv set, Conv c) { + return (static_cast(set) & static_cast(c)) == + static_cast(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 +struct ConvertResult { + static constexpr Conv kConv = C; + bool value; +}; +template +constexpr Conv ConvertResult::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; +} + +} // namespace str_format_internal + +} // inline namespace lts_2018_12_18 +} // namespace absl + +#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_ -- cgit v1.2.3