Add absl::CharSet.

PiperOrigin-RevId: 559415517
Change-Id: I5bbc744bf00be2fd15ec7544b725d699e0d982fb

3 files changed, 0 insertions, 391 deletions

diff --git a/absl/strings/internal/char_map.h b/absl/strings/internal/char_map.h
deleted file mode 100644
index 70a90343..00000000
--- a/absl/strings/internal/char_map.h
+++ /dev/null
@@ -1,158 +0,0 @@
-// 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.
-//
-// Character Map Class
-//
-// A fast, bit-vector map for 8-bit unsigned characters.
-// This class is useful for non-character purposes as well.
-
-#ifndef ABSL_STRINGS_INTERNAL_CHAR_MAP_H_
-#define ABSL_STRINGS_INTERNAL_CHAR_MAP_H_
-
-#include <cstddef>
-#include <cstdint>
-#include <cstring>
-
-#include "absl/base/macros.h"
-#include "absl/base/port.h"
-
-namespace absl {
-ABSL_NAMESPACE_BEGIN
-namespace strings_internal {
-
-class Charmap {
- public:
-  constexpr Charmap() : m_() {}
-
-  // Initializes with a given char*.  Note that NUL is not treated as
-  // a terminator, but rather a char to be flicked.
-  Charmap(const char* str, int len) : m_() {
-    while (len--) SetChar(*str++);
-  }
-
-  // Initializes with a given char*.  NUL is treated as a terminator
-  // and will not be in the charmap.
-  explicit Charmap(const char* str) : m_() {
-    while (*str) SetChar(*str++);
-  }
-
-  constexpr bool contains(unsigned char c) const {
-    return (m_[c / 64] >> (c % 64)) & 0x1;
-  }
-
-  // Returns true if and only if a character exists in both maps.
-  bool IntersectsWith(const Charmap& c) const {
-    for (size_t i = 0; i < ABSL_ARRAYSIZE(m_); ++i) {
-      if ((m_[i] & c.m_[i]) != 0) return true;
-    }
-    return false;
-  }
-
-  bool IsZero() const {
-    for (uint64_t c : m_) {
-      if (c != 0) return false;
-    }
-    return true;
-  }
-
-  // Containing only a single specified char.
-  static constexpr Charmap Char(char x) {
-    return Charmap(CharMaskForWord(x, 0), CharMaskForWord(x, 1),
-                   CharMaskForWord(x, 2), CharMaskForWord(x, 3));
-  }
-
-  // Containing all the chars in the C-string 's'.
-  static constexpr Charmap FromString(const char* s) {
-    Charmap ret;
-    while (*s) ret = ret | Char(*s++);
-    return ret;
-  }
-
-  // Containing all the chars in the closed interval [lo,hi].
-  static constexpr Charmap Range(char lo, char hi) {
-    return Charmap(RangeForWord(lo, hi, 0), RangeForWord(lo, hi, 1),
-                   RangeForWord(lo, hi, 2), RangeForWord(lo, hi, 3));
-  }
-
-  friend constexpr Charmap operator&(const Charmap& a, const Charmap& b) {
-    return Charmap(a.m_[0] & b.m_[0], a.m_[1] & b.m_[1], a.m_[2] & b.m_[2],
-                   a.m_[3] & b.m_[3]);
-  }
-
-  friend constexpr Charmap operator|(const Charmap& a, const Charmap& b) {
-    return Charmap(a.m_[0] | b.m_[0], a.m_[1] | b.m_[1], a.m_[2] | b.m_[2],
-                   a.m_[3] | b.m_[3]);
-  }
-
-  friend constexpr Charmap operator~(const Charmap& a) {
-    return Charmap(~a.m_[0], ~a.m_[1], ~a.m_[2], ~a.m_[3]);
-  }
-
- private:
-  constexpr Charmap(uint64_t b0, uint64_t b1, uint64_t b2, uint64_t b3)
-      : m_{b0, b1, b2, b3} {}
-
-  static constexpr uint64_t RangeForWord(char lo, char hi, uint64_t word) {
-    return OpenRangeFromZeroForWord(static_cast<unsigned char>(hi) + 1, word) &
-           ~OpenRangeFromZeroForWord(static_cast<unsigned char>(lo), word);
-  }
-
-  // All the chars in the specified word of the range [0, upper).
-  static constexpr uint64_t OpenRangeFromZeroForWord(uint64_t upper,
-                                                     uint64_t word) {
-    return (upper <= 64 * word)
-               ? 0
-               : (upper >= 64 * (word + 1))
-                     ? ~static_cast<uint64_t>(0)
-                     : (~static_cast<uint64_t>(0) >> (64 - upper % 64));
-  }
-
-  static constexpr uint64_t CharMaskForWord(char x, uint64_t word) {
-    const auto unsigned_x = static_cast<unsigned char>(x);
-    return (unsigned_x / 64 == word)
-               ? (static_cast<uint64_t>(1) << (unsigned_x % 64))
-               : 0;
-  }
-
-  void SetChar(char c) {
-    const auto unsigned_c = static_cast<unsigned char>(c);
-    m_[unsigned_c / 64] |= static_cast<uint64_t>(1) << (unsigned_c % 64);
-  }
-
-  uint64_t m_[4];
-};
-
-// Mirror the char-classifying predicates in <cctype>
-constexpr Charmap UpperCharmap() { return Charmap::Range('A', 'Z'); }
-constexpr Charmap LowerCharmap() { return Charmap::Range('a', 'z'); }
-constexpr Charmap DigitCharmap() { return Charmap::Range('0', '9'); }
-constexpr Charmap AlphaCharmap() { return LowerCharmap() | UpperCharmap(); }
-constexpr Charmap AlnumCharmap() { return DigitCharmap() | AlphaCharmap(); }
-constexpr Charmap XDigitCharmap() {
-  return DigitCharmap() | Charmap::Range('A', 'F') | Charmap::Range('a', 'f');
-}
-constexpr Charmap PrintCharmap() { return Charmap::Range(0x20, 0x7e); }
-constexpr Charmap SpaceCharmap() { return Charmap::FromString("\t\n\v\f\r "); }
-constexpr Charmap CntrlCharmap() {
-  return Charmap::Range(0, 0x7f) & ~PrintCharmap();
-}
-constexpr Charmap BlankCharmap() { return Charmap::FromString("\t "); }
-constexpr Charmap GraphCharmap() { return PrintCharmap() & ~SpaceCharmap(); }
-constexpr Charmap PunctCharmap() { return GraphCharmap() & ~AlnumCharmap(); }
-
-}  // namespace strings_internal
-ABSL_NAMESPACE_END
-}  // namespace absl
-
-#endif  // ABSL_STRINGS_INTERNAL_CHAR_MAP_H_
diff --git a/absl/strings/internal/char_map_benchmark.cc b/absl/strings/internal/char_map_benchmark.cc
deleted file mode 100644
index 5cef967b..00000000
--- a/absl/strings/internal/char_map_benchmark.cc
+++ /dev/null
@@ -1,61 +0,0 @@
-// 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.
-
-#include "absl/strings/internal/char_map.h"
-
-#include <cstdint>
-
-#include "benchmark/benchmark.h"
-
-namespace {
-
-absl::strings_internal::Charmap MakeBenchmarkMap() {
-  absl::strings_internal::Charmap m;
-  uint32_t x[] = {0x0, 0x1, 0x2, 0x3, 0xf, 0xe, 0xd, 0xc};
-  for (uint32_t& t : x) t *= static_cast<uint32_t>(0x11111111UL);
-  for (uint32_t i = 0; i < 256; ++i) {
-    if ((x[i / 32] >> (i % 32)) & 1)
-      m = m | absl::strings_internal::Charmap::Char(i);
-  }
-  return m;
-}
-
-// Micro-benchmark for Charmap::contains.
-void BM_Contains(benchmark::State& state) {
-  // Loop-body replicated 10 times to increase time per iteration.
-  // Argument continuously changed to avoid generating common subexpressions.
-  const absl::strings_internal::Charmap benchmark_map = MakeBenchmarkMap();
-  unsigned char c = 0;
-  int ops = 0;
-  for (auto _ : state) {
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-    ops += benchmark_map.contains(c++);
-  }
-  benchmark::DoNotOptimize(ops);
-}
-BENCHMARK(BM_Contains);
-
-// We don't bother benchmarking Charmap::IsZero or Charmap::IntersectsWith;
-// their running time is data-dependent and it is not worth characterizing
-// "typical" data.
-
-}  // namespace
diff --git a/absl/strings/internal/char_map_test.cc b/absl/strings/internal/char_map_test.cc
deleted file mode 100644
index d3306241..00000000
--- a/absl/strings/internal/char_map_test.cc
+++ /dev/null
@@ -1,172 +0,0 @@
-// 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.
-
-#include "absl/strings/internal/char_map.h"
-
-#include <cctype>
-#include <string>
-#include <vector>
-
-#include "gmock/gmock.h"
-#include "gtest/gtest.h"
-
-namespace {
-
-constexpr absl::strings_internal::Charmap everything_map =
-    ~absl::strings_internal::Charmap();
-constexpr absl::strings_internal::Charmap nothing_map{};
-
-TEST(Charmap, AllTests) {
-  const absl::strings_internal::Charmap also_nothing_map("", 0);
-  ASSERT_TRUE(everything_map.contains('\0'));
-  ASSERT_TRUE(!nothing_map.contains('\0'));
-  ASSERT_TRUE(!also_nothing_map.contains('\0'));
-  for (unsigned char ch = 1; ch != 0; ++ch) {
-    ASSERT_TRUE(everything_map.contains(ch));
-    ASSERT_TRUE(!nothing_map.contains(ch));
-    ASSERT_TRUE(!also_nothing_map.contains(ch));
-  }
-
-  const absl::strings_internal::Charmap symbols("&@#@^!@?", 5);
-  ASSERT_TRUE(symbols.contains('&'));
-  ASSERT_TRUE(symbols.contains('@'));
-  ASSERT_TRUE(symbols.contains('#'));
-  ASSERT_TRUE(symbols.contains('^'));
-  ASSERT_TRUE(!symbols.contains('!'));
-  ASSERT_TRUE(!symbols.contains('?'));
-  int cnt = 0;
-  for (unsigned char ch = 1; ch != 0; ++ch)
-    cnt += symbols.contains(ch);
-  ASSERT_EQ(cnt, 4);
-
-  const absl::strings_internal::Charmap lets("^abcde", 3);
-  const absl::strings_internal::Charmap lets2("fghij\0klmnop", 10);
-  const absl::strings_internal::Charmap lets3("fghij\0klmnop");
-  ASSERT_TRUE(lets2.contains('k'));
-  ASSERT_TRUE(!lets3.contains('k'));
-
-  ASSERT_TRUE(symbols.IntersectsWith(lets));
-  ASSERT_TRUE(!lets2.IntersectsWith(lets));
-  ASSERT_TRUE(lets.IntersectsWith(symbols));
-  ASSERT_TRUE(!lets.IntersectsWith(lets2));
-
-  ASSERT_TRUE(nothing_map.IsZero());
-  ASSERT_TRUE(!lets.IsZero());
-}
-
-namespace {
-std::string Members(const absl::strings_internal::Charmap& m) {
-  std::string r;
-  for (size_t i = 0; i < 256; ++i)
-    if (m.contains(i)) r.push_back(i);
-  return r;
-}
-
-std::string ClosedRangeString(unsigned char lo, unsigned char hi) {
-  // Don't depend on lo<hi. Just increment until lo==hi.
-  std::string s;
-  while (true) {
-    s.push_back(lo);
-    if (lo == hi) break;
-    ++lo;
-  }
-  return s;
-}
-
-}  // namespace
-
-TEST(Charmap, Constexpr) {
-  constexpr absl::strings_internal::Charmap kEmpty = nothing_map;
-  EXPECT_THAT(Members(kEmpty), "");
-  constexpr absl::strings_internal::Charmap kA =
-      absl::strings_internal::Charmap::Char('A');
-  EXPECT_THAT(Members(kA), "A");
-  constexpr absl::strings_internal::Charmap kAZ =
-      absl::strings_internal::Charmap::Range('A', 'Z');
-  EXPECT_THAT(Members(kAZ), "ABCDEFGHIJKLMNOPQRSTUVWXYZ");
-  constexpr absl::strings_internal::Charmap kIdentifier =
-      absl::strings_internal::Charmap::Range('0', '9') |
-      absl::strings_internal::Charmap::Range('A', 'Z') |
-      absl::strings_internal::Charmap::Range('a', 'z') |
-      absl::strings_internal::Charmap::Char('_');
-  EXPECT_THAT(Members(kIdentifier),
-              "0123456789"
-              "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
-              "_"
-              "abcdefghijklmnopqrstuvwxyz");
-  constexpr absl::strings_internal::Charmap kAll = everything_map;
-  for (size_t i = 0; i < 256; ++i) {
-    EXPECT_TRUE(kAll.contains(i)) << i;
-  }
-  constexpr absl::strings_internal::Charmap kHello =
-      absl::strings_internal::Charmap::FromString("Hello, world!");
-  EXPECT_THAT(Members(kHello), " !,Hdelorw");
-
-  // test negation and intersection
-  constexpr absl::strings_internal::Charmap kABC =
-      absl::strings_internal::Charmap::Range('A', 'Z') &
-      ~absl::strings_internal::Charmap::Range('D', 'Z');
-  EXPECT_THAT(Members(kABC), "ABC");
-}
-
-TEST(Charmap, Range) {
-  // Exhaustive testing takes too long, so test some of the boundaries that
-  // are perhaps going to cause trouble.
-  std::vector<size_t> poi = {0,   1,   2,   3,   4,   7,   8,   9,  15,
-                             16,  17,  30,  31,  32,  33,  63,  64, 65,
-                             127, 128, 129, 223, 224, 225, 254, 255};
-  for (auto lo = poi.begin(); lo != poi.end(); ++lo) {
-    SCOPED_TRACE(*lo);
-    for (auto hi = lo; hi != poi.end(); ++hi) {
-      SCOPED_TRACE(*hi);
-      EXPECT_THAT(Members(absl::strings_internal::Charmap::Range(*lo, *hi)),
-                  ClosedRangeString(*lo, *hi));
-    }
-  }
-}
-
-bool AsBool(int x) { return static_cast<bool>(x); }
-
-TEST(CharmapCtype, Match) {
-  for (int c = 0; c < 256; ++c) {
-    SCOPED_TRACE(c);
-    SCOPED_TRACE(static_cast<char>(c));
-    EXPECT_EQ(AsBool(std::isupper(c)),
-              absl::strings_internal::UpperCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::islower(c)),
-              absl::strings_internal::LowerCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::isdigit(c)),
-              absl::strings_internal::DigitCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::isalpha(c)),
-              absl::strings_internal::AlphaCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::isalnum(c)),
-              absl::strings_internal::AlnumCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::isxdigit(c)),
-              absl::strings_internal::XDigitCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::isprint(c)),
-              absl::strings_internal::PrintCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::isspace(c)),
-              absl::strings_internal::SpaceCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::iscntrl(c)),
-              absl::strings_internal::CntrlCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::isblank(c)),
-              absl::strings_internal::BlankCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::isgraph(c)),
-              absl::strings_internal::GraphCharmap().contains(c));
-    EXPECT_EQ(AsBool(std::ispunct(c)),
-              absl::strings_internal::PunctCharmap().contains(c));
-  }
-}
-
-}  // namespace