96 lines
2.6 KiB
C++
96 lines
2.6 KiB
C++
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/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2014 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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// mapnik
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#include <mapnik/text/font_feature_settings.hpp>
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#include <mapnik/config_error.hpp>
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// boost
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#include <boost/spirit/include/qi.hpp>
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// stl
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#include <algorithm>
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#include <cctype>
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#include <sstream>
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namespace mapnik
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{
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font_feature_settings::font_feature_settings(std::string const& features)
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{
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from_string(features);
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}
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void font_feature_settings::from_string(std::string const& features)
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{
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features_.clear();
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if (std::all_of(features.begin(), features.end(), isspace)) return;
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namespace qi = boost::spirit::qi;
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qi::char_type char_;
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qi::as_string_type as_string;
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auto app = [&](std::string const& s) { append(s); };
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if (!qi::parse(features.begin(), features.end(), as_string[+(char_ - ',')][app] % ','))
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{
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throw config_error("failed to parse font-features: '" + features + "'");
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}
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}
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std::string font_feature_settings::to_string() const
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{
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std::ostringstream output;
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constexpr size_t buffsize = 128;
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char buff[buffsize];
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bool first = true;
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for (auto feature : features_)
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{
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if (!first)
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{
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output << ", ";
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first = false;
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}
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hb_feature_to_string(&feature, buff, buffsize);
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output << buff;
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}
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return output.str();
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}
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void font_feature_settings::append(std::string const& feature)
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{
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features_.emplace_back();
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feature_iterator current_feature = features_.end() - 1;
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if (!hb_feature_from_string(feature.c_str(), feature.length(), &*current_feature))
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{
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features_.erase(current_feature);
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throw config_error("failed to parse font-features: '" + feature + "'");
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}
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}
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}
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