Refactored namespaces
This commit is contained in:
emeric
@@ -0,0 +1,439 @@
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/*
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* Copyright (C) 2020 Emeric Poupon
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*
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* This file is part of LMS.
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*
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* LMS is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* LMS is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with LMS. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "core/String.hpp"
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#include <algorithm>
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#include <iomanip>
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#include <utility>
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#include <Wt/WDateTime.h>
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#include <Wt/WDate.h>
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namespace lms::core::stringUtils
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{
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namespace details
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{
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constexpr std::pair<char, std::string_view> jsEscapeChars[]
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{
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{ '\\', "\\\\" },
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{ '\n', "\\n" },
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{ '\r', "\\r" },
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{ '\t', "\\t" },
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{ '"', "\\\"" },
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{ '\'', "\\\'" },
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};
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constexpr std::pair<char, std::string_view> jsonEscapeChars[]
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{
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{ '\\', "\\\\" },
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{ '\n', "\\n" },
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{ '\r', "\\r" },
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{ '\t', "\\t" },
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{ '"', "\\\"" },
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};
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template <std::size_t N>
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std::string escape(std::string_view str, const std::pair<char, std::string_view>(&charsToEscape)[N])
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{
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std::string escaped;
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escaped.reserve(str.length());
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for (const char c : str)
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{
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auto it{ std::find_if(std::cbegin(charsToEscape), std::cend(charsToEscape), [c](const auto& entry) { return entry.first == c; }) };
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if (it == std::cend(charsToEscape))
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{
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escaped += c;
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continue;
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}
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escaped += it->second;
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}
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return escaped;
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}
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template <std::size_t N>
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void writeEscapedString(std::ostream& os, std::string_view str, const std::pair<char, std::string_view>(&charsToEscape)[N])
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{
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for (const char c : str)
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{
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auto itEntry{ std::find_if(std::cbegin(charsToEscape), std::cend(charsToEscape), [=](const auto& entry) { return entry.first == c;}) };
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if (itEntry != std::cend(charsToEscape))
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os << itEntry->second;
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else
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os << c;
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}
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}
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template <typename StringType>
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std::string joinStrings(std::span<const StringType> strings, std::string_view delimiter)
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{
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std::string res;
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bool first{ true };
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for (const StringType& str : strings)
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{
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if (!first)
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res += delimiter;
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res += str;
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first = false;
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}
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return res;
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}
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}
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template<>
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std::optional<std::string> readAs(std::string_view str)
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{
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return std::string{ str };
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}
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template<>
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std::optional<std::string_view> readAs(std::string_view str)
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{
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return str;
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}
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template<>
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std::optional<bool> readAs(std::string_view str)
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{
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if (str == "1" || str == "true")
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return true;
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else if (str == "0" || str == "false")
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return false;
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return std::nullopt;
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}
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std::vector<std::string_view> splitString(std::string_view str, char separator)
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{
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return splitString(str, std::string_view{ &separator, 1 });
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}
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std::vector<std::string_view> splitString(std::string_view str, std::string_view separator)
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{
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std::vector<std::string_view> res;
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if (separator.empty())
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return { str };
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size_t pos{};
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size_t found{ str.find(separator) };
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while (found != std::string_view::npos)
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{
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res.push_back(str.substr(pos, found - pos));
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pos = found + separator.size();
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found = str.find(separator, pos);
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}
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res.push_back(str.substr(pos));
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return res;
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}
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std::string joinStrings(std::span<const std::string_view> strings, std::string_view delimiter)
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{
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return details::joinStrings(strings, delimiter);
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}
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std::string joinStrings(std::span<const std::string> strings, std::string_view delimiter)
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{
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return details::joinStrings(strings, delimiter);
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}
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std::string joinStrings(std::span<const std::string> strings, char delimiter)
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{
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return details::joinStrings(strings, std::string_view{ &delimiter, 1 });
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}
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std::string joinStrings(std::span<const std::string_view> strings, char delimiter)
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{
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return details::joinStrings(strings, std::string_view{ &delimiter, 1 });
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}
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std::string escapeAndJoinStrings(std::span<const std::string_view> strings, char delimiter, char escapeChar)
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{
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std::string result;
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for (const std::string_view str : strings)
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{
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if (!result.empty())
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result.push_back(delimiter);
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for (char c : str)
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{
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if (c == delimiter || c == escapeChar)
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result.push_back(escapeChar);
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result.push_back(c);
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}
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}
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return result;
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}
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std::vector<std::string> splitEscapedStrings(std::string_view str, char delimiter, char escapeChar)
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{
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std::vector<std::string> result;
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std::string current;
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bool escaped{};
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for (char c : str)
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{
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if (escaped) {
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current.push_back(c);
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escaped = false;
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}
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else
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{
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if (c == delimiter)
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{
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result.push_back(std::move(current));
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current.clear();
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}
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else if (c == escapeChar)
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escaped = true;
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else
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current.push_back(c);
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}
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}
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if (!current.empty())
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result.push_back(std::move(current));
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return result;
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}
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std::string_view stringTrim(std::string_view str, std::string_view whitespaces)
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{
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std::string_view res;
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const auto strBegin = str.find_first_not_of(whitespaces);
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if (strBegin != std::string_view::npos)
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{
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const auto strEnd{ str.find_last_not_of(whitespaces) };
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const auto strRange{ strEnd - strBegin + 1 };
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res = str.substr(strBegin, strRange);
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}
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return res;
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}
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std::string_view stringTrimEnd(std::string_view str, std::string_view whitespaces)
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{
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return str.substr(0, str.find_last_not_of(whitespaces) + 1);
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}
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std::string stringToLower(std::string_view str)
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{
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std::string res;
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res.reserve(str.size());
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std::transform(std::cbegin(str), std::cend(str), std::back_inserter(res), [](unsigned char c) { return std::tolower(c);});
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return res;
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}
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void stringToLower(std::string& str)
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{
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std::transform(std::cbegin(str), std::cend(str), std::begin(str), [](unsigned char c) { return std::tolower(c);});
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}
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std::string stringToUpper(const std::string& str)
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{
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std::string res;
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res.reserve(str.size());
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std::transform(std::cbegin(str), std::cend(str), std::back_inserter(res), [](char c) { return std::toupper(c);});
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return res;
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}
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std::string bufferToString(std::span<const unsigned char> data)
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{
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std::ostringstream oss;
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for (unsigned char c : data)
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{
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oss << std::setw(2) << std::setfill('0') << std::hex << (int)c;
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}
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return oss.str();
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}
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bool stringCaseInsensitiveEqual(std::string_view strA, std::string_view strB)
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{
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if (strA.size() != strB.size())
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return false;
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for (std::size_t i{}; i < strA.size(); ++i)
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{
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if (std::tolower(strA[i]) != std::tolower(strB[i]))
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return false;
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}
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return true;
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}
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void capitalize(std::string& str)
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{
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for (auto it{ std::begin(str) }; it != std::end(str); ++it)
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{
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if (std::isspace(*it))
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continue;
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if (std::isalpha(*it))
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*it = std::toupper(*it);
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break;
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}
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}
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std::string replaceInString(std::string_view str, const std::string& from, const std::string& to)
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{
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std::string res{ str };
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size_t pos = 0;
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while ((pos = res.find(from, pos)) != std::string::npos)
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{
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res.replace(pos, from.length(), to);
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pos += to.length();
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}
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return res;
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}
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std::string jsEscape(std::string_view str)
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{
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return details::escape(str, details::jsEscapeChars);
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}
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void writeJSEscapedString(std::ostream& os, std::string_view str)
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{
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details::writeEscapedString(os, str, details::jsEscapeChars);
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}
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std::string jsonEscape(std::string_view str)
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{
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return details::escape(str, details::jsonEscapeChars);
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}
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void writeJsonEscapedString(std::ostream& os, std::string_view str)
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{
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details::writeEscapedString(os, str, details::jsonEscapeChars);
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}
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std::string escapeString(std::string_view str, std::string_view charsToEscape, char escapeChar)
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{
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std::string res;
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res.reserve(str.size());
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for (const char c : str)
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{
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if (std::any_of(std::cbegin(charsToEscape), std::cend(charsToEscape), [c](char charToEscape) { return c == charToEscape; }))
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res += escapeChar;
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res += c;
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}
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return res;
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}
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std::string unescapeString(std::string_view str, char escapeChar)
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{
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std::string res;
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res.reserve(str.size());
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bool escaped{};
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for (char c : str)
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{
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if (escaped)
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{
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res += c;
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escaped = false;
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}
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else
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{
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if (c == escapeChar)
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escaped = true;
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else
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res += c;
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}
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}
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if (escaped)
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res += escapeChar;
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return res;
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}
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bool stringEndsWith(std::string_view str, std::string_view ending)
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{
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if (str.length() < ending.length())
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return false;
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return str.substr(str.length() - ending.length()) == ending;
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}
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std::optional<std::string> stringFromHex(const std::string& str)
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{
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static const char lut[]{ "0123456789ABCDEF" };
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if (str.length() % 2 != 0)
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return std::nullopt;
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std::string res;
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res.reserve(str.length() / 2);
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auto it{ std::cbegin(str) };
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while (it != std::cend(str))
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{
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unsigned val{};
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auto itHigh{ std::lower_bound(std::cbegin(lut), std::cend(lut), std::toupper(*(it++))) };
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auto itLow{ std::lower_bound(std::cbegin(lut), std::cend(lut), std::toupper(*(it++))) };
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if (itHigh == std::cend(lut) || itLow == std::cend(lut))
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return {};
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val = std::distance(std::cbegin(lut), itHigh) << 4;
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val += std::distance(std::cbegin(lut), itLow);
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res.push_back(static_cast<char>(val));
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}
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return res;
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}
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std::string toISO8601String(const Wt::WDateTime& dateTime)
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{
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// assume UTC
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return dateTime.toString("yyyy-MM-ddThh:mm:ss.zzz", false).toUTF8();
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}
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std::string toISO8601String(const Wt::WDate& date)
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{
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// assume UTC
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return date.toString("yyyy-MM-dd").toUTF8();
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}
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}
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