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//
// 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 constexpr bool StartsWith(absl::string_view text,
absl::string_view prefix) noexcept {
if (prefix.empty()) {
return true;
}
if (text.size() < prefix.size()) {
return false;
}
absl::string_view possible_match = text.substr(0, prefix.size());
return possible_match == prefix;
}
// EndsWith()
//
// Returns whether a given string `text` ends with `suffix`.
inline constexpr bool EndsWith(absl::string_view text,
absl::string_view suffix) noexcept {
if (suffix.empty()) {
return true;
}
if (text.size() < suffix.size()) {
return false;
}
absl::string_view possible_match = text.substr(text.size() - suffix.size());
return possible_match == suffix;
}
// StrContainsIgnoreCase()
//
// Returns whether a given ASCII string `haystack` contains the ASCII substring
// `needle`, ignoring case in the comparison.
bool StrContainsIgnoreCase(absl::string_view haystack,
absl::string_view needle) noexcept;
bool StrContainsIgnoreCase(absl::string_view haystack,
char needle) noexcept;
// 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;
// Yields the longest prefix in common between both input strings.
// Pointer-wise, the returned result is a subset of input "a".
absl::string_view FindLongestCommonPrefix(absl::string_view a,
absl::string_view b);
// Yields the longest suffix in common between both input strings.
// Pointer-wise, the returned result is a subset of input "a".
absl::string_view FindLongestCommonSuffix(absl::string_view a,
absl::string_view b);
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_STRINGS_MATCH_H_
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