SkStringView.h

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/*
 * Copyright 2021 Google LLC.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */
 
#ifndef SkStringView_DEFINED
#define SkStringView_DEFINED
 
#include <cstring>
#include <string_view>
 
namespace skstd {
 
// C++20 additions
inline constexpr bool starts_with(std::string_view str, std::string_view prefix) {
    if (prefix.length() > str.length()) {
        return false;
    }
    return prefix.length() == 0 || !memcmp(str.data(), prefix.data(), prefix.length());
}
 
inline constexpr bool starts_with(std::string_view str, std::string_view::value_type c) {
    return !str.empty() && str.front() == c;
}
 
inline constexpr bool ends_with(std::string_view str, std::string_view suffix) {
    if (suffix.length() > str.length()) {
        return false;
    }
    return suffix.length() == 0 || !memcmp(str.data() + str.length() - suffix.length(),
                                           suffix.data(), suffix.length());
}
 
inline constexpr bool ends_with(std::string_view str, std::string_view::value_type c) {
    return !str.empty() && str.back() == c;
}
 
// C++23 additions
inline constexpr bool contains(std::string_view str, std::string_view needle) {
    return str.find(needle) != std::string_view::npos;
}
 
inline constexpr bool contains(std::string_view str, std::string_view::value_type c) {
    return str.find(c) != std::string_view::npos;
}
 
}  // namespace skstd
 
#endif