summaryrefslogtreecommitdiffstats
path: root/parser/html/jArray.h
blob: 24bad27dcea81a14f7b7be6a67977d709b4c731d (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
/*
 * Copyright (c) 2008-2015 Mozilla Foundation
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 */

#ifndef jArray_h
#define jArray_h

#include <array>
#include "mozilla/Attributes.h"
#include "mozilla/BinarySearch.h"

template <class T, class L>
struct staticJArray {
  const T* arr;
  const L length;
  operator T*() { return arr; }
  T& operator[](L const index) {
    MOZ_ASSERT(index >= 0, "Array access with negative index.");
    MOZ_ASSERT(index < length, "Array index out of bounds.");
    return ((T*)arr)[index];
  }
  L binarySearch(T const elem) {
    size_t idx;
    bool found = mozilla::BinarySearch(arr, 0, length, elem, &idx);
    return found ? idx : -1;
  }
};

template <class T, class L>
class autoJArray;

template <class T, class L>
class jArray {
  friend class autoJArray<T, L>;

 private:
  T* arr;

 public:
  L length;
  static jArray<T, L> newJArray(L const len) {
    MOZ_ASSERT(len >= 0, "Negative length.");
    jArray<T, L> newArray = {new T[size_t(len)], len};
    return newArray;
  }
  static jArray<T, L> newFallibleJArray(L const len) {
    MOZ_ASSERT(len >= 0, "Negative length.");
    T* a = new (mozilla::fallible) T[size_t(len)];
    jArray<T, L> newArray = {a, a ? len : 0};
    return newArray;
  }
  operator T*() { return arr; }
  T& operator[](L const index) {
    MOZ_ASSERT(index >= 0, "Array access with negative index.");
    MOZ_ASSERT(index < length, "Array index out of bounds.");
    return arr[index];
  }
  void operator=(staticJArray<T, L>& other) {
    arr = (T*)other.arr;
    length = other.length;
  }
  MOZ_IMPLICIT jArray(decltype(nullptr)) : arr(nullptr), length(0) {}
  jArray() : arr(nullptr), length(0) {}

 private:
  jArray(T* aArr, L aLength) : arr(aArr), length(aLength) {}
};

template <class T, class L>
class autoJArray {
 private:
  T* arr;

 public:
  L length;
  autoJArray() : arr(0), length(0) {}
  MOZ_IMPLICIT autoJArray(const jArray<T, L>& other)
      : arr(other.arr), length(other.length) {}
  ~autoJArray() { delete[] arr; }
  operator T*() { return arr; }
  T& operator[](L const index) {
    MOZ_ASSERT(index >= 0, "Array access with negative index.");
    MOZ_ASSERT(index < length, "Array index out of bounds.");
    return arr[index];
  }
  operator jArray<T, L>() {
    // WARNING! This makes it possible to goof with buffer ownership!
    // This is needed for the getStack and getListOfActiveFormattingElements
    // methods to work sensibly.
    jArray<T, L> newArray = {arr, length};
    return newArray;
  }
  void operator=(const jArray<T, L>& other) {
    delete[] arr;
    arr = other.arr;
    length = other.length;
  }
  void operator=(decltype(nullptr)) {
    // Make assigning null to an array in Java delete the buffer in C++
    delete[] arr;
    arr = nullptr;
    length = 0;
  }
};

template <class T, size_t S>
class jInlineArray : public std::array<T, S> {
 public:
  using std::array<T, S>::array;

  template <typename U>
  explicit jInlineArray(U* aData) {
    T* data = this->data();
    for (size_t i = 0; i < S; ++i) {
      data[i] = aData[i];
    }
  }
};

#endif  // jArray_h