1 /**
2 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #ifndef PANDA_VERIFIER_UTIL_STR_HPP
17 #define PANDA_VERIFIER_UTIL_STR_HPP
18
19 #include "lazy.h"
20 #include "include/mem/panda_string.h"
21
22 #include <type_traits>
23
24 namespace panda::verifier {
25
26 template <typename StrT, typename Gen>
27 StrT Join(Gen gen, StrT delim = {", "})
28 {
29 return FoldLeft(gen, StrT {""}, [needDelim = false, &delim](StrT accum, StrT str) mutable {
30 if (needDelim) {
31 accum += delim;
32 }
33 needDelim = true;
34 return accum + str;
35 });
36 }
37
38 template <typename Int, typename = std::enable_if_t<std::is_integral_v<Int>>>
39 // NOLINTNEXTLINE(readability-magic-numbers)
40 PandaString NumToStr(Int val, Int base = 10, size_t width = 0)
41 {
42 PandaString result {};
43 if (base <= 0) {
44 return result;
45 }
46 bool neg = false;
47 if (val < 0) {
48 neg = true;
49 val = -val;
50 }
51 do {
52 char c = static_cast<char>(val % base);
53 constexpr char LETTER_DIGIT_START = static_cast<char>(10);
54 if (c >= LETTER_DIGIT_START) {
55 c += 'a' - LETTER_DIGIT_START;
56 } else {
57 c += '0';
58 }
59 result.insert(0, 1, c);
60 val = val / base;
61 } while (val);
62 if (width > 0) {
63 if (neg) {
64 width -= 1;
65 }
66 if (result.length() < width) {
67 result.insert(0, width - result.length(), '0');
68 }
69 }
70 if (neg) {
71 result.insert(0, "-");
72 }
73 return result;
74 }
75
76 template <typename Offset>
OffsetToHexStr(Offset offset)77 PandaString OffsetToHexStr(Offset offset)
78 {
79 constexpr Offset BASE = 16U;
80 // leave space for - if needed
81 constexpr size_t WIDTH = sizeof(Offset) + (std::is_signed_v<Offset> ? 1 : 0);
82 return NumToStr(offset, BASE, WIDTH);
83 }
84 } // namespace panda::verifier
85
86 #endif // !PANDA_VERIFIER_UTIL_STR_HPP
87