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Diffstat (limited to 'absl/strings/strip.h')
-rw-r--r-- | absl/strings/strip.h | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/absl/strings/strip.h b/absl/strings/strip.h new file mode 100644 index 00000000..370f9e88 --- /dev/null +++ b/absl/strings/strip.h @@ -0,0 +1,89 @@ +// +// 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 +// +// http://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: strip.h +// ----------------------------------------------------------------------------- +// +// This file contains various functions for stripping substrings from a std::string. +#ifndef ABSL_STRINGS_STRIP_H_ +#define ABSL_STRINGS_STRIP_H_ + +#include <cstddef> +#include <string> + +#include "absl/base/macros.h" +#include "absl/strings/ascii.h" +#include "absl/strings/match.h" +#include "absl/strings/string_view.h" + +namespace absl { + +// ConsumePrefix() +// +// Strips the `expected` prefix from the start of the given std::string, returning +// `true` if the strip operation succeeded or false otherwise. +// +// Example: +// +// absl::string_view input("abc"); +// EXPECT_TRUE(absl::ConsumePrefix(&input, "a")); +// EXPECT_EQ(input, "bc"); +inline bool ConsumePrefix(absl::string_view* str, absl::string_view expected) { + if (!absl::StartsWith(*str, expected)) return false; + str->remove_prefix(expected.size()); + return true; +} +// ConsumeSuffix() +// +// Strips the `expected` suffix from the end of the given std::string, returning +// `true` if the strip operation succeeded or false otherwise. +// +// Example: +// +// absl::string_view input("abcdef"); +// EXPECT_TRUE(absl::ConsumeSuffix(&input, "def")); +// EXPECT_EQ(input, "abc"); +inline bool ConsumeSuffix(absl::string_view* str, absl::string_view expected) { + if (!absl::EndsWith(*str, expected)) return false; + str->remove_suffix(expected.size()); + return true; +} + +// StripPrefix() +// +// Returns a view into the input std::string 'str' with the given 'prefix' removed, +// but leaving the original std::string intact. If the prefix does not match at the +// start of the std::string, returns the original std::string instead. +inline absl::string_view StripPrefix(absl::string_view str, + absl::string_view prefix) { + if (absl::StartsWith(str, prefix)) str.remove_prefix(prefix.size()); + return str; +} + +// StripSuffix() +// +// Returns a view into the input std::string 'str' with the given 'suffix' removed, +// but leaving the original std::string intact. If the suffix does not match at the +// end of the std::string, returns the original std::string instead. +inline absl::string_view StripSuffix(absl::string_view str, + absl::string_view suffix) { + if (absl::EndsWith(str, suffix)) str.remove_suffix(suffix.size()); + return str; +} + +} // namespace absl + +#endif // ABSL_STRINGS_STRIP_H_ |