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normalize string_util (firebase#708)
* refactoring string_util * port string_util to iOS
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,72 @@ | ||
| /* | ||
| * Copyright 2017 Google | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| // Useful string functions and so forth. This is a grab-bag file. | ||
| // | ||
| // These functions work fine for UTF-8 strings as long as you can | ||
| // consider them to be just byte strings. For example, due to the | ||
| // design of UTF-8 you do not need to worry about accidental matches, | ||
| // as long as all your inputs are valid UTF-8 (use \uHHHH, not \xHH or \oOOO). | ||
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| #ifndef FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_STRING_UTIL_H_ | ||
| #define FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_STRING_UTIL_H_ | ||
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| #include <string> | ||
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| #include "absl/strings/string_view.h" | ||
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| namespace firebase { | ||
| namespace firestore { | ||
| namespace util { | ||
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| /* | ||
| * Returns the smallest lexicographically larger string of equal or smaller | ||
| * length. Returns an empty string if there is no such successor (if the input | ||
| * is empty or consists entirely of 0xff bytes). | ||
| * Useful for calculating the smallest lexicographically larger string | ||
| * that will not be prefixed by the input string. | ||
| * | ||
| * Examples: | ||
| * "a" -> "b", "aaa" -> "aab", "aa\xff" -> "ab", "\xff" -> "", "" -> "" | ||
| */ | ||
| std::string PrefixSuccessor(absl::string_view prefix); | ||
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| /* | ||
| * Returns the immediate lexicographically-following string. This is useful to | ||
| * turn an inclusive range into something that can be used with Bigtable's | ||
| * SetLimitRow(): | ||
| * | ||
| * // Inclusive range [min_element, max_element]. | ||
| * string min_element = ...; | ||
| * string max_element = ...; | ||
| * | ||
| * // Equivalent range [range_start, range_end). | ||
| * string range_start = min_element; | ||
| * string range_end = ImmediateSuccessor(max_element); | ||
| * | ||
| * WARNING: Returns the input string with a '\0' appended; if you call c_str() | ||
| * on the result, it will compare equal to s. | ||
| * | ||
| * WARNING: Transforms "" -> "\0"; this doesn't account for Bigtable's special | ||
| * treatment of "" as infinity. | ||
| */ | ||
| std::string ImmediateSuccessor(absl::string_view s); | ||
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| } // namespace util | ||
| } // namespace firestore | ||
| } // namespace firebase | ||
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| #endif // FIRESTORE_CORE_SRC_FIREBASE_FIRESTORE_UTIL_STRING_UTIL_H_ |
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