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