1 /*
2 * Copyright (c) Huawei Technologies Co., Ltd. 2021. All rights reserved.
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 #include "string_utils.h"
16 #include <sstream>
17 #include <iomanip>
18
EndsWith(const std::string& str, const std::string& postfix)19 bool StringUtils::EndsWith(const std::string& str, const std::string& postfix)
20 {
21 if (str.size() < postfix.size()) {
22 return false;
23 }
24 return str.compare(str.size() - postfix.size(), postfix.size(), postfix) == 0;
25 }
26
StartsWith(const std::string& str, const std::string& prefix)27 bool StringUtils::StartsWith(const std::string& str, const std::string& prefix)
28 {
29 if (str.size() < prefix.size()) {
30 return false;
31 }
32 return str.compare(0, prefix.size(), prefix) == 0;
33 }
34
ConvertToHex(uint64_t num)35 std::string StringUtils::ConvertToHex(uint64_t num)
36 {
37 std::stringstream ss;
38 ss << std::hex << num;
39 return ss.str();
40 }
41
Contains(const std::string& str, const std::string& target)42 bool StringUtils::Contains(const std::string& str, const std::string& target)
43 {
44 return str.find(target) != std::string::npos;
45 }
46
Strip(const std::string& str)47 std::string StringUtils::Strip(const std::string& str)
48 {
49 std::string blanks = " \f\v\t\r\n";
50
51 auto first = str.find_first_not_of(blanks);
52 if (first == std::string::npos) {
53 return "";
54 }
55
56 auto last = str.find_last_not_of(blanks);
57 if (last == std::string::npos) {
58 return "";
59 }
60 return str.substr(first, last - first + 1);
61 }
62
Join(const std::vector<std::string>& strs, const std::string& sep)63 std::string StringUtils::Join(const std::vector<std::string>& strs, const std::string& sep)
64 {
65 std::string result;
66 for (auto& s : strs) {
67 result += s;
68 result += sep;
69 }
70 if (result.size() > sep.size()) {
71 result.resize(result.size() - sep.size());
72 }
73 return result;
74 }
75
Split(const std::string& str, const std::string& sep)76 std::vector<std::string> StringUtils::Split(const std::string& str, const std::string& sep)
77 {
78 std::vector<std::string> result;
79 if (str.empty() || sep.empty() || str.size() < sep.size()) {
80 return result;
81 }
82 size_t start = 0; // start index
83 size_t pos = 0;
84 while (start < str.size()) {
85 pos = str.find(sep, start);
86 if (pos != std::string::npos) {
87 result.push_back(str.substr(start, pos - start));
88 start = pos + sep.size(); // next start index
89 } else {
90 // the last part
91 result.push_back(str.substr(start));
92 break;
93 }
94 }
95 return result;
96 }