64 lines
1.9 KiB
C++
64 lines
1.9 KiB
C++
/*
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openDCM, dimensional constraint manager
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Copyright (C) 2013 Stefan Troeger <stefantroeger@gmx.net>
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This library is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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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
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License along
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with this library; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef DCM_INDENT_H
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#define DCM_INDENT_H
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#include <boost/iostreams/concepts.hpp>
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#include <boost/iostreams/operations.hpp>
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#include <boost/iostreams/filtering_stream.hpp>
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class indent_filter : public boost::iostreams::output_filter {
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public:
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explicit indent_filter() : indent(0) {};
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template<typename Sink>
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bool put(Sink& dest, int c) {
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if(c == '#') {
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indent++;
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return true;
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} else if(c == '$') {
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indent--;
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return true;
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} else if(c == '\n') {
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bool ret = boost::iostreams::put(dest, c);
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for(int i=0; (i<indent) && ret; i++) {
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ret = boost::iostreams::put(dest, ' ');
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ret = boost::iostreams::put(dest, ' ');
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}
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return ret;
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};
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indent = (indent < 0) ? 0 : indent;
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return boost::iostreams::put(dest, c);
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}
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template<typename Source>
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void close(Source&) {
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indent = 0;
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}
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private:
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int indent;
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};
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#endif //DCM_INDENT_H
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