match.h
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1 //
2 // Copyright 2017 The Abseil Authors.
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 // https://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 // File: match.h
18 // -----------------------------------------------------------------------------
19 //
20 // This file contains simple utilities for performing string matching checks.
21 // All of these function parameters are specified as `absl::string_view`,
22 // meaning that these functions can accept `std::string`, `absl::string_view` or
23 // nul-terminated C-style strings.
24 //
25 // Examples:
26 // std::string s = "foo";
27 // absl::string_view sv = "f";
28 // assert(absl::StrContains(s, sv));
29 //
30 // Note: The order of parameters in these functions is designed to mimic the
31 // order an equivalent member function would exhibit;
32 // e.g. `s.Contains(x)` ==> `absl::StrContains(s, x).
33 #ifndef ABSL_STRINGS_MATCH_H_
34 #define ABSL_STRINGS_MATCH_H_
35 
36 #include <cstring>
37 
39 
40 namespace absl {
41 
42 // StrContains()
43 //
44 // Returns whether a given string `haystack` contains the substring `needle`.
45 inline bool StrContains(absl::string_view haystack, absl::string_view needle) {
46  return haystack.find(needle, 0) != haystack.npos;
47 }
48 
49 // StartsWith()
50 //
51 // Returns whether a given string `text` begins with `prefix`.
52 inline bool StartsWith(absl::string_view text, absl::string_view prefix) {
53  return prefix.empty() ||
54  (text.size() >= prefix.size() &&
55  memcmp(text.data(), prefix.data(), prefix.size()) == 0);
56 }
57 
58 // EndsWith()
59 //
60 // Returns whether a given string `text` ends with `suffix`.
61 inline bool EndsWith(absl::string_view text, absl::string_view suffix) {
62  return suffix.empty() ||
63  (text.size() >= suffix.size() &&
64  memcmp(text.data() + (text.size() - suffix.size()), suffix.data(),
65  suffix.size()) == 0
66  );
67 }
68 
69 // EqualsIgnoreCase()
70 //
71 // Returns whether given ASCII strings `piece1` and `piece2` are equal, ignoring
72 // case in the comparison.
74 
75 // StartsWithIgnoreCase()
76 //
77 // Returns whether a given ASCII string `text` starts with `prefix`,
78 // ignoring case in the comparison.
80 
81 // EndsWithIgnoreCase()
82 //
83 // Returns whether a given ASCII string `text` ends with `suffix`, ignoring
84 // case in the comparison.
86 
87 } // namespace absl
88 
89 #endif // ABSL_STRINGS_MATCH_H_
size_type find(string_view s, size_type pos=0) const noexcept
Definition: string_view.cc:92
static constexpr size_type npos
Definition: string_view.h:159
Definition: algorithm.h:29
constexpr size_type size() const noexcept
Definition: string_view.h:260
bool EndsWith(absl::string_view text, absl::string_view suffix)
Definition: match.h:61
constexpr bool empty() const noexcept
Definition: string_view.h:277
bool EndsWithIgnoreCase(absl::string_view text, absl::string_view suffix)
Definition: match.cc:33
bool StartsWithIgnoreCase(absl::string_view text, absl::string_view prefix)
Definition: match.cc:28
constexpr const_pointer data() const noexcept
Definition: string_view.h:302
bool StartsWith(absl::string_view text, absl::string_view prefix)
Definition: match.h:52
bool StrContains(absl::string_view haystack, absl::string_view needle)
Definition: match.h:45
bool EqualsIgnoreCase(absl::string_view piece1, absl::string_view piece2)
Definition: match.cc:21


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autogenerated on Mon Feb 28 2022 21:31:19