// // Copyright 2017 The Abseil Authors. // // Licensed under the Apache License, Version 2.0 (the "License"); // you may not use this file except in compliance with the License. // You may obtain a copy of the License at // // https://www.apache.org/licenses/LICENSE-2.0 // // Unless required by applicable law or agreed to in writing, software // distributed under the License is distributed on an "AS IS" BASIS, // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. // See the License for the specific language governing permissions and // limitations under the License. // // ----------------------------------------------------------------------------- // File: match.h // ----------------------------------------------------------------------------- // // This file contains simple utilities for performing string matching checks. // All of these function parameters are specified as `absl::string_view`, // meaning that these functions can accept `std::string`, `absl::string_view` or // NUL-terminated C-style strings. // // Examples: // std::string s = "foo"; // absl::string_view sv = "f"; // assert(absl::StrContains(s, sv)); // // Note: The order of parameters in these functions is designed to mimic the // order an equivalent member function would exhibit; // e.g. `s.Contains(x)` ==> `absl::StrContains(s, x). #ifndef ABSL_STRINGS_MATCH_H_ #define ABSL_STRINGS_MATCH_H_ #include <cstring> #include "absl/strings/string_view.h" namespace absl { ABSL_NAMESPACE_BEGIN // StrContains() // // Returns whether a given string `haystack` contains the substring `needle`. inline bool StrContains(absl::string_view haystack, absl::string_view needle) noexcept { return haystack.find(needle, 0) != haystack.npos; } inline bool StrContains(absl::string_view haystack, char needle) noexcept { return haystack.find(needle) != haystack.npos; } // StartsWith() // // Returns whether a given string `text` begins with `prefix`. inline bool StartsWith(absl::string_view text, absl::string_view prefix) noexcept { return prefix.empty() || (text.size() >= prefix.size() && memcmp(text.data(), prefix.data(), prefix.size()) == 0); } // EndsWith() // // Returns whether a given string `text` ends with `suffix`. inline bool EndsWith(absl::string_view text, absl::string_view suffix) noexcept { return suffix.empty() || (text.size() >= suffix.size() && memcmp(text.data() + (text.size() - suffix.size()), suffix.data(), suffix.size()) == 0); } // EqualsIgnoreCase() // // Returns whether given ASCII strings `piece1` and `piece2` are equal, ignoring // case in the comparison. bool EqualsIgnoreCase(absl::string_view piece1, absl::string_view piece2) noexcept; // StartsWithIgnoreCase() // // Returns whether a given ASCII string `text` starts with `prefix`, // ignoring case in the comparison. bool StartsWithIgnoreCase(absl::string_view text, absl::string_view prefix) noexcept; // EndsWithIgnoreCase() // // Returns whether a given ASCII string `text` ends with `suffix`, ignoring // case in the comparison. bool EndsWithIgnoreCase(absl::string_view text, absl::string_view suffix) noexcept; ABSL_NAMESPACE_END } // namespace absl #endif // ABSL_STRINGS_MATCH_H_