1 /*
2 * Copyright (C) 2015 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 #include "android-base/strings.h"
18
19 #include <stdlib.h>
20 #include <string.h>
21
22 #include <string>
23 #include <vector>
24
25 namespace android {
26 namespace base {
27
28 #define CHECK_NE(a, b) \
29 if ((a) == (b)) abort();
30
Split(const std::string & s,const std::string & delimiters)31 std::vector<std::string> Split(const std::string& s,
32 const std::string& delimiters) {
33 CHECK_NE(delimiters.size(), 0U);
34
35 std::vector<std::string> result;
36
37 size_t base = 0;
38 size_t found;
39 while (true) {
40 found = s.find_first_of(delimiters, base);
41 result.push_back(s.substr(base, found - base));
42 if (found == s.npos) break;
43 base = found + 1;
44 }
45
46 return result;
47 }
48
Trim(const std::string & s)49 std::string Trim(const std::string& s) {
50 std::string result;
51
52 if (s.size() == 0) {
53 return result;
54 }
55
56 size_t start_index = 0;
57 size_t end_index = s.size() - 1;
58
59 // Skip initial whitespace.
60 while (start_index < s.size()) {
61 if (!isspace(s[start_index])) {
62 break;
63 }
64 start_index++;
65 }
66
67 // Skip terminating whitespace.
68 while (end_index >= start_index) {
69 if (!isspace(s[end_index])) {
70 break;
71 }
72 end_index--;
73 }
74
75 // All spaces, no beef.
76 if (end_index < start_index) {
77 return "";
78 }
79 // Start_index is the first non-space, end_index is the last one.
80 return s.substr(start_index, end_index - start_index + 1);
81 }
82
83 // These cases are probably the norm, so we mark them extern in the header to
84 // aid compile time and binary size.
85 template std::string Join(const std::vector<std::string>&, char);
86 template std::string Join(const std::vector<const char*>&, char);
87 template std::string Join(const std::vector<std::string>&, const std::string&);
88 template std::string Join(const std::vector<const char*>&, const std::string&);
89
StartsWith(std::string_view s,std::string_view prefix)90 bool StartsWith(std::string_view s, std::string_view prefix) {
91 return s.substr(0, prefix.size()) == prefix;
92 }
93
StartsWith(std::string_view s,char prefix)94 bool StartsWith(std::string_view s, char prefix) {
95 return !s.empty() && s.front() == prefix;
96 }
97
StartsWithIgnoreCase(std::string_view s,std::string_view prefix)98 bool StartsWithIgnoreCase(std::string_view s, std::string_view prefix) {
99 return s.size() >= prefix.size() && strncasecmp(s.data(), prefix.data(), prefix.size()) == 0;
100 }
101
EndsWith(std::string_view s,std::string_view suffix)102 bool EndsWith(std::string_view s, std::string_view suffix) {
103 return s.size() >= suffix.size() && s.substr(s.size() - suffix.size(), suffix.size()) == suffix;
104 }
105
EndsWith(std::string_view s,char suffix)106 bool EndsWith(std::string_view s, char suffix) {
107 return !s.empty() && s.back() == suffix;
108 }
109
EndsWithIgnoreCase(std::string_view s,std::string_view suffix)110 bool EndsWithIgnoreCase(std::string_view s, std::string_view suffix) {
111 return s.size() >= suffix.size() &&
112 strncasecmp(s.data() + (s.size() - suffix.size()), suffix.data(), suffix.size()) == 0;
113 }
114
EqualsIgnoreCase(std::string_view lhs,std::string_view rhs)115 bool EqualsIgnoreCase(std::string_view lhs, std::string_view rhs) {
116 return lhs.size() == rhs.size() && strncasecmp(lhs.data(), rhs.data(), lhs.size()) == 0;
117 }
118
StringReplace(std::string_view s,std::string_view from,std::string_view to,bool all)119 std::string StringReplace(std::string_view s, std::string_view from, std::string_view to,
120 bool all) {
121 if (from.empty()) return std::string(s);
122
123 std::string result;
124 std::string_view::size_type start_pos = 0;
125 do {
126 std::string_view::size_type pos = s.find(from, start_pos);
127 if (pos == std::string_view::npos) break;
128
129 result.append(s.data() + start_pos, pos - start_pos);
130 result.append(to.data(), to.size());
131
132 start_pos = pos + from.size();
133 } while (all);
134 result.append(s.data() + start_pos, s.size() - start_pos);
135 return result;
136 }
137
138 } // namespace base
139 } // namespace android
140