3a37d8320c
Shaves lots of string allocations, and uses optimized code paths Change-Id: I8e33e2aecdc7e0d2f2c31b774daa36304b3973ac Reviewed-on: https://gerrit.libreoffice.org/c/core/+/173179 Tested-by: Jenkins Reviewed-by: Mike Kaganski <mike.kaganski@collabora.com>
107 lines
3.3 KiB
C++
107 lines
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/*
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* This file is part of the LibreOffice project.
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*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/.
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*/
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#include <fasttokenhandler.hxx>
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#include <xmloff/token/tokens.hxx>
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namespace xmloff {
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namespace {
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// include auto-generated Perfect_Hash
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#if defined __clang__
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#pragma GCC diagnostic push
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#pragma GCC diagnostic ignored "-Wimplicit-fallthrough"
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#if __has_warning("-Wdeprecated-register")
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#pragma GCC diagnostic ignored "-Wdeprecated-register"
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#endif
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#endif
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#include <tokenhash.inc>
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#if defined __clang__
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#pragma GCC diagnostic pop
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#endif
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} // namespace
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namespace token {
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using namespace css;
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static sal_Int32 getTokenPerfectHash(const char* pStr, sal_Int32 nLength)
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{
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const struct xmltoken* pToken = Perfect_Hash::in_word_set(pStr, nLength);
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return pToken ? pToken->nToken : xmloff::XML_TOKEN_INVALID;
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}
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static const std::pair<css::uno::Sequence<sal_Int8>, OUString>& getNames(sal_Int32 nToken)
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{
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static const auto saTokenNames = []()
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{
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static constexpr std::string_view sppcTokenNames[] = {
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#include <tokennames.inc>
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};
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static_assert(std::size(sppcTokenNames) == XML_TOKEN_COUNT);
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std::vector<std::pair<css::uno::Sequence<sal_Int8>, OUString>> names;
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names.reserve(std::size(sppcTokenNames));
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std::transform(std::begin(sppcTokenNames), std::end(sppcTokenNames),
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std::back_inserter(names),
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[](auto token)
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{
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return std::make_pair(
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css::uno::Sequence<sal_Int8>(
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reinterpret_cast<const sal_Int8*>(token.data()), token.size()),
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OStringToOUString(token, RTL_TEXTENCODING_UTF8));
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});
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return names;
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}();
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SAL_WARN_IF(nToken < 0 || nToken >= XML_TOKEN_COUNT, "xmloff", "Wrong nToken parameter");
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if (0 <= nToken && nToken < XML_TOKEN_COUNT)
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return saTokenNames[nToken];
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static const std::pair<css::uno::Sequence<sal_Int8>, OUString> EMPTY;
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return EMPTY;
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}
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css::uno::Sequence<sal_Int8> const& TokenMap::getUtf8TokenName(sal_Int32 nToken)
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{
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return getNames(nToken).first;
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}
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sal_Int32 TokenMap::getTokenFromUtf8(std::string_view token)
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{
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return getTokenPerfectHash(token.data(), token.size());
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}
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// XFastTokenHandler
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uno::Sequence< sal_Int8 > FastTokenHandler::getUTF8Identifier( sal_Int32 nToken )
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{
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return TokenMap::getUtf8TokenName( nToken );
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}
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const OUString& FastTokenHandler::getIdentifier(sal_Int32 nToken)
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{
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return getNames(nToken).second;
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}
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sal_Int32 FastTokenHandler::getTokenFromUTF8( const uno::Sequence< sal_Int8 >& rIdentifier )
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{
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return TokenMap::getTokenFromUtf8(std::string_view(
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reinterpret_cast<const char*>(rIdentifier.getConstArray()), rIdentifier.getLength()));
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}
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// Much faster direct C++ shortcut
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sal_Int32 FastTokenHandler::getTokenDirect(std::string_view token) const
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{
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return TokenMap::getTokenFromUtf8(token);
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}
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} // namespace token
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} // namespace xmloff
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/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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