1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef MINIKIN_U16STRING_PIECE_H
18#define MINIKIN_U16STRING_PIECE_H
19
20#include <vector>
21
22#include "minikin/Range.h"
23
24namespace minikin {
25
26class U16StringPiece {
27public:
28    U16StringPiece() : mData(nullptr), mLength(0) {}
29    U16StringPiece(const uint16_t* data, uint32_t length) : mData(data), mLength(length) {}
30    U16StringPiece(const std::vector<uint16_t>& v)  // Intentionally not explicit.
31            : mData(v.data()), mLength(static_cast<uint32_t>(v.size())) {}
32    template <uint32_t length>
33    U16StringPiece(uint16_t const (&data)[length]) : mData(data), mLength(length) {}
34
35    U16StringPiece(const U16StringPiece&) = default;
36    U16StringPiece& operator=(const U16StringPiece&) = default;
37
38    inline const uint16_t* data() const { return mData; }
39    inline uint32_t size() const { return mLength; }
40    inline uint32_t length() const { return mLength; }
41
42    // Undefined behavior if pos is out of range.
43    inline const uint16_t& at(uint32_t pos) const { return mData[pos]; }
44    inline const uint16_t& operator[](uint32_t pos) const { return mData[pos]; }
45
46    inline U16StringPiece substr(const Range& range) const {
47        return U16StringPiece(mData + range.getStart(), range.getLength());
48    }
49
50    inline bool hasChar(uint16_t c) const {
51        const uint16_t* end = mData + mLength;
52        return std::find(mData, end, c) != end;
53    }
54
55private:
56    const uint16_t* mData;
57    uint32_t mLength;
58};
59
60}  // namespace minikin
61
62#endif  // MINIKIN_U16STRING_PIECE_H
63