summaryrefslogtreecommitdiff
path: root/core/fxcrt/bytestring.h
blob: f534b08b8a03d379ca4bc1be3dbde38d25cace41 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
// Copyright 2017 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com

#ifndef CORE_FXCRT_BYTESTRING_H_
#define CORE_FXCRT_BYTESTRING_H_

#include <functional>
#include <iterator>
#include <sstream>
#include <utility>

#include "core/fxcrt/fx_system.h"
#include "core/fxcrt/retain_ptr.h"
#include "core/fxcrt/string_data_template.h"
#include "core/fxcrt/string_view_template.h"
#include "third_party/base/optional.h"

namespace fxcrt {

class ByteString_Concat_Test;
class StringPool_ByteString_Test;
class WideString;

// A mutable string with shared buffers using copy-on-write semantics that
// avoids the cost of std::string's iterator stability guarantees.
class ByteString {
 public:
  using CharType = char;
  using const_iterator = const CharType*;
  using const_reverse_iterator = std::reverse_iterator<const_iterator>;

  ByteString();
  ByteString(const ByteString& other);
  ByteString(ByteString&& other) noexcept;

  // Deliberately implicit to avoid calling on every string literal.
  // NOLINTNEXTLINE(runtime/explicit)
  ByteString(char ch);
  // NOLINTNEXTLINE(runtime/explicit)
  ByteString(const char* ptr);

  // No implicit conversions from wide strings.
  // NOLINTNEXTLINE(runtime/explicit)
  ByteString(wchar_t) = delete;

  ByteString(const char* ptr, size_t len);
  ByteString(const uint8_t* ptr, size_t len);

  explicit ByteString(const ByteStringView& bstrc);
  ByteString(const ByteStringView& bstrc1, const ByteStringView& bstrc2);
  ByteString(const std::initializer_list<ByteStringView>& list);
  explicit ByteString(const std::ostringstream& outStream);

  ~ByteString();

  void clear() { m_pData.Reset(); }

  static ByteString FromUnicode(const WideString& str);

  // Explicit conversion to C-style string.
  // Note: Any subsequent modification of |this| will invalidate the result.
  const char* c_str() const { return m_pData ? m_pData->m_String : ""; }

  // Explicit conversion to uint8_t*.
  // Note: Any subsequent modification of |this| will invalidate the result.
  const uint8_t* raw_str() const {
    return m_pData ? reinterpret_cast<const uint8_t*>(m_pData->m_String)
                   : nullptr;
  }

  // Explicit conversion to ByteStringView.
  // Note: Any subsequent modification of |this| will invalidate the result.
  ByteStringView AsStringView() const {
    return ByteStringView(raw_str(), GetLength());
  }

  // Note: Any subsequent modification of |this| will invalidate iterators.
  const_iterator begin() const { return m_pData ? m_pData->m_String : nullptr; }
  const_iterator end() const {
    return m_pData ? m_pData->m_String + m_pData->m_nDataLength : nullptr;
  }

  // Note: Any subsequent modification of |this| will invalidate iterators.
  const_reverse_iterator rbegin() const {
    return const_reverse_iterator(end());
  }
  const_reverse_iterator rend() const {
    return const_reverse_iterator(begin());
  }

  size_t GetLength() const { return m_pData ? m_pData->m_nDataLength : 0; }
  size_t GetStringLength() const {
    return m_pData ? strlen(m_pData->m_String) : 0;
  }
  bool IsEmpty() const { return !GetLength(); }
  bool IsValidIndex(size_t index) const { return index < GetLength(); }
  bool IsValidLength(size_t length) const { return length <= GetLength(); }

  int Compare(const ByteStringView& str) const;
  bool EqualNoCase(const ByteStringView& str) const;

  bool operator==(const char* ptr) const;
  bool operator==(const ByteStringView& str) const;
  bool operator==(const ByteString& other) const;

  bool operator!=(const char* ptr) const { return !(*this == ptr); }
  bool operator!=(const ByteStringView& str) const { return !(*this == str); }
  bool operator!=(const ByteString& other) const { return !(*this == other); }

  bool operator<(const char* ptr) const;
  bool operator<(const ByteStringView& str) const;
  bool operator<(const ByteString& other) const;

  const ByteString& operator=(const char* str);
  const ByteString& operator=(const ByteStringView& bstrc);
  const ByteString& operator=(const ByteString& stringSrc);

  const ByteString& operator+=(char ch);
  const ByteString& operator+=(const char* str);
  const ByteString& operator+=(const ByteString& str);
  const ByteString& operator+=(const ByteStringView& bstrc);

  CharType operator[](const size_t index) const {
    ASSERT(IsValidIndex(index));
    return m_pData ? m_pData->m_String[index] : 0;
  }

  CharType First() const { return GetLength() ? (*this)[0] : 0; }
  CharType Last() const { return GetLength() ? (*this)[GetLength() - 1] : 0; }

  void SetAt(size_t index, char c);

  size_t Insert(size_t index, char ch);
  size_t InsertAtFront(char ch) { return Insert(0, ch); }
  size_t InsertAtBack(char ch) { return Insert(GetLength(), ch); }
  size_t Delete(size_t index, size_t count = 1);

  void Format(const char* lpszFormat, ...);
  void FormatV(const char* lpszFormat, va_list argList);

  void Reserve(size_t len);
  char* GetBuffer(size_t len);
  void ReleaseBuffer(size_t len);

  ByteString Mid(size_t first, size_t count) const;
  ByteString Left(size_t count) const;
  ByteString Right(size_t count) const;

  pdfium::Optional<size_t> Find(const ByteStringView& lpszSub,
                                size_t start = 0) const;
  pdfium::Optional<size_t> Find(char ch, size_t start = 0) const;
  pdfium::Optional<size_t> ReverseFind(char ch) const;

  bool Contains(const ByteStringView& lpszSub, size_t start = 0) const {
    return Find(lpszSub, start).has_value();
  }

  bool Contains(char ch, size_t start = 0) const {
    return Find(ch, start).has_value();
  }

  void MakeLower();
  void MakeUpper();

  void TrimRight();
  void TrimRight(char chTarget);
  void TrimRight(const ByteStringView& lpszTargets);

  void TrimLeft();
  void TrimLeft(char chTarget);
  void TrimLeft(const ByteStringView& lpszTargets);

  size_t Replace(const ByteStringView& lpszOld, const ByteStringView& lpszNew);

  size_t Remove(char ch);

  WideString UTF8Decode() const;

  uint32_t GetID() const { return AsStringView().GetID(); }

  static ByteString FormatInteger(int i);
  static ByteString FormatFloat(float f);

 protected:
  using StringData = StringDataTemplate<char>;

  void ReallocBeforeWrite(size_t nNewLen);
  void AllocBeforeWrite(size_t nNewLen);
  void AllocCopy(ByteString& dest, size_t nCopyLen, size_t nCopyIndex) const;
  void AssignCopy(const char* pSrcData, size_t nSrcLen);
  void Concat(const char* lpszSrcData, size_t nSrcLen);

  RetainPtr<StringData> m_pData;

  friend ByteString_Concat_Test;
  friend class StringPool_ByteString_Test;
};

inline bool operator==(const char* lhs, const ByteString& rhs) {
  return rhs == lhs;
}
inline bool operator==(const ByteStringView& lhs, const ByteString& rhs) {
  return rhs == lhs;
}
inline bool operator!=(const char* lhs, const ByteString& rhs) {
  return rhs != lhs;
}
inline bool operator!=(const ByteStringView& lhs, const ByteString& rhs) {
  return rhs != lhs;
}
inline bool operator<(const char* lhs, const ByteString& rhs) {
  return rhs.Compare(lhs) > 0;
}

inline ByteString operator+(const ByteStringView& str1,
                            const ByteStringView& str2) {
  return ByteString(str1, str2);
}
inline ByteString operator+(const ByteStringView& str1, const char* str2) {
  return ByteString(str1, str2);
}
inline ByteString operator+(const char* str1, const ByteStringView& str2) {
  return ByteString(str1, str2);
}
inline ByteString operator+(const ByteStringView& str1, char ch) {
  return ByteString(str1, ByteStringView(ch));
}
inline ByteString operator+(char ch, const ByteStringView& str2) {
  return ByteString(ch, str2);
}
inline ByteString operator+(const ByteString& str1, const ByteString& str2) {
  return ByteString(str1.AsStringView(), str2.AsStringView());
}
inline ByteString operator+(const ByteString& str1, char ch) {
  return ByteString(str1.AsStringView(), ByteStringView(ch));
}
inline ByteString operator+(char ch, const ByteString& str2) {
  return ByteString(ch, str2.AsStringView());
}
inline ByteString operator+(const ByteString& str1, const char* str2) {
  return ByteString(str1.AsStringView(), str2);
}
inline ByteString operator+(const char* str1, const ByteString& str2) {
  return ByteString(str1, str2.AsStringView());
}
inline ByteString operator+(const ByteString& str1,
                            const ByteStringView& str2) {
  return ByteString(str1.AsStringView(), str2);
}
inline ByteString operator+(const ByteStringView& str1,
                            const ByteString& str2) {
  return ByteString(str1, str2.AsStringView());
}

std::ostream& operator<<(std::ostream& os, const ByteString& str);
std::ostream& operator<<(std::ostream& os, const ByteStringView& str);

}  // namespace fxcrt

using ByteString = fxcrt::ByteString;

uint32_t FX_HashCode_GetA(const ByteStringView& str, bool bIgnoreCase);

namespace std {

template <>
struct hash<ByteString> {
  std::size_t operator()(const ByteString& str) const {
    return FX_HashCode_GetA(str.AsStringView(), false);
  }
};

}  // namespace std

extern template struct std::hash<ByteString>;

#endif  // CORE_FXCRT_BYTESTRING_H_