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69 lines
1.4 KiB
C++
69 lines
1.4 KiB
C++
/*
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* Copyright (c) 2008 Andrew Garrett.
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* Copyright (c) 2008 River Tarnell <river@wikimedia.org>
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* Derived from public domain code contributed by Victor Vasiliev.
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*
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* Permission is granted to anyone to use this software for any purpose,
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* including commercial applications, and to alter it and redistribute it
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* freely. This software is provided 'as-is', without any express or
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* implied warranty.
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*/
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#include <fstream>
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#include <string>
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#include <boost/lexical_cast.hpp>
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#include "equiv.h"
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#include "aftypes.h"
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#define EQUIVSET_LOC "equivset.txt"
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namespace afp {
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equiv_set::equiv_set()
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{
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// Map of codepoint:codepoint
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std::ifstream eqsFile(EQUIVSET_LOC);
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if (!eqsFile)
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throw exception( "Unable to open equivalence sets!" );
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std::string line;
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while (getline(eqsFile, line)) {
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size_t pos = line.find(':');
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if (pos != line.npos) try {
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// We have a codepoint:codepoint thing.
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int actual = boost::lexical_cast<int>(line.substr(0, pos));
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int canonical = boost::lexical_cast<int>(line.substr(pos + 1));
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if (actual != 0 && canonical != 0)
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equivs_[actual] = canonical;
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} catch (boost::bad_lexical_cast &) {}
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}
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}
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int
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equiv_set::get(int c) const
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{
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std::map<int, int>::const_iterator it;
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if ((it = equivs_.find(c)) == equivs_.end())
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return c;
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return it->second;
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}
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equiv_set const &
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equiv_set::instance()
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{
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static equiv_set inst;
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return inst;
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}
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} // namespace afp
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