Abseil Common Libraries (C++) (grcp 依赖)
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93 lines
3.1 KiB
93 lines
3.1 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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// https://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: strip.h |
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// ----------------------------------------------------------------------------- |
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// |
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// This file contains various functions for stripping substrings from a string. |
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#ifndef ABSL_STRINGS_STRIP_H_ |
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#define ABSL_STRINGS_STRIP_H_ |
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#include <cstddef> |
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#include <string> |
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#include "absl/base/macros.h" |
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#include "absl/strings/ascii.h" |
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#include "absl/strings/match.h" |
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#include "absl/strings/string_view.h" |
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namespace absl { |
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ABSL_NAMESPACE_BEGIN |
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// ConsumePrefix() |
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// |
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// Strips the `expected` prefix, if found, from the start of `str`. |
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// If the operation succeeded, `true` is returned. If not, `false` |
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// is returned and `str` is not modified. |
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// |
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// Example: |
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// |
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// absl::string_view input("abc"); |
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// EXPECT_TRUE(absl::ConsumePrefix(&input, "a")); |
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// EXPECT_EQ(input, "bc"); |
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inline bool ConsumePrefix(absl::string_view* str, absl::string_view expected) { |
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if (!absl::StartsWith(*str, expected)) return false; |
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str->remove_prefix(expected.size()); |
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return true; |
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} |
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// ConsumeSuffix() |
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// |
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// Strips the `expected` suffix, if found, from the end of `str`. |
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// If the operation succeeded, `true` is returned. If not, `false` |
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// is returned and `str` is not modified. |
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// |
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// Example: |
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// |
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// absl::string_view input("abcdef"); |
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// EXPECT_TRUE(absl::ConsumeSuffix(&input, "def")); |
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// EXPECT_EQ(input, "abc"); |
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inline bool ConsumeSuffix(absl::string_view* str, absl::string_view expected) { |
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if (!absl::EndsWith(*str, expected)) return false; |
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str->remove_suffix(expected.size()); |
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return true; |
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} |
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// StripPrefix() |
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// |
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// Returns a view into the input string `str` with the given `prefix` removed, |
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// but leaving the original string intact. If the prefix does not match at the |
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// start of the string, returns the original string instead. |
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ABSL_MUST_USE_RESULT inline absl::string_view StripPrefix( |
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absl::string_view str, absl::string_view prefix) { |
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if (absl::StartsWith(str, prefix)) str.remove_prefix(prefix.size()); |
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return str; |
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} |
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// StripSuffix() |
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// |
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// Returns a view into the input string `str` with the given `suffix` removed, |
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// but leaving the original string intact. If the suffix does not match at the |
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// end of the string, returns the original string instead. |
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ABSL_MUST_USE_RESULT inline absl::string_view StripSuffix( |
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absl::string_view str, absl::string_view suffix) { |
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if (absl::EndsWith(str, suffix)) str.remove_suffix(suffix.size()); |
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return str; |
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} |
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ABSL_NAMESPACE_END |
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} // namespace absl |
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#endif // ABSL_STRINGS_STRIP_H_
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