1 /*
2 * Copyright 2021 Google LLC.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #ifndef SkStringView_DEFINED
9 #define SkStringView_DEFINED
10
11 #include <cstring>
12 #include <string_view>
13
14 namespace skstd {
15
16 // C++20 additions
starts_with(std::string_view str,std::string_view prefix)17 inline constexpr bool starts_with(std::string_view str, std::string_view prefix) {
18 if (prefix.length() > str.length()) {
19 return false;
20 }
21 return prefix.length() == 0 || !memcmp(str.data(), prefix.data(), prefix.length());
22 }
23
starts_with(std::string_view str,std::string_view::value_type c)24 inline constexpr bool starts_with(std::string_view str, std::string_view::value_type c) {
25 return !str.empty() && str.front() == c;
26 }
27
ends_with(std::string_view str,std::string_view suffix)28 inline constexpr bool ends_with(std::string_view str, std::string_view suffix) {
29 if (suffix.length() > str.length()) {
30 return false;
31 }
32 return suffix.length() == 0 || !memcmp(str.data() + str.length() - suffix.length(),
33 suffix.data(), suffix.length());
34 }
35
ends_with(std::string_view str,std::string_view::value_type c)36 inline constexpr bool ends_with(std::string_view str, std::string_view::value_type c) {
37 return !str.empty() && str.back() == c;
38 }
39
40 // C++23 additions
contains(std::string_view str,std::string_view needle)41 inline constexpr bool contains(std::string_view str, std::string_view needle) {
42 return str.find(needle) != std::string_view::npos;
43 }
44
contains(std::string_view str,std::string_view::value_type c)45 inline constexpr bool contains(std::string_view str, std::string_view::value_type c) {
46 return str.find(c) != std::string_view::npos;
47 }
48
49 } // namespace skstd
50
51 #endif
52