--- /dev/null
+//
+// 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
+//
+// https://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 <limits.h>
+#include <cstddef>
+#include <cstring>
+#include <ostream>
+
+#include "absl/base/port.h"
+#include "absl/strings/internal/str_format/output.h"
+#include "absl/strings/string_view.h"
+
+class Cord;
+
+namespace absl {
+
+namespace str_format_internal {
+
+class FormatRawSinkImpl {
+ public:
+ // Implicitly convert from any type that provides the hook function as
+ // described above.
+ template <typename T, decltype(str_format_internal::InvokeFlush(
+ std::declval<T*>(), string_view()))* = nullptr>
+ FormatRawSinkImpl(T* raw) // NOLINT
+ : sink_(raw), write_(&FormatRawSinkImpl::Flush<T>) {}
+
+ void Write(string_view s) { write_(sink_, s); }
+
+ template <typename T>
+ static FormatRawSinkImpl Extract(T s) {
+ return s.sink_;
+ }
+
+ private:
+ template <typename T>
+ static void Flush(void* r, string_view s) {
+ str_format_internal::InvokeFlush(static_cast<T*>(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 <typename T>
+ T Wrap() {
+ return T(this);
+ }
+
+ template <typename T>
+ 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,
+ 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<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));
+}
+
+// Checks whether `c` exists in `set`.
+constexpr bool Contains(Conv set, char c) {
+ return (static_cast<uint64_t>(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<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;
+ bool value;
+};
+template <Conv C>
+constexpr Conv ConvertResult<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;
+}
+
+} // namespace str_format_internal
+
+} // namespace absl
+
+#endif // ABSL_STRINGS_INTERNAL_STR_FORMAT_EXTENSION_H_
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