921 lines
21 KiB
C++
921 lines
21 KiB
C++
/*****************************************************************************
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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) 2016 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/value.hpp>
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#include <mapnik/value_types.hpp>
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#include <mapnik/util/conversions.hpp>
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// stl
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#include <cmath>
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#include <string>
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#include <type_traits>
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// icu
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#include <unicode/unistr.h>
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#include <unicode/ustring.h>
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namespace mapnik {
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namespace detail {
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namespace {
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template <typename T, typename U>
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struct both_arithmetic : std::integral_constant<bool,
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std::is_arithmetic<T>::value &&
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std::is_arithmetic<U>::value> {};
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struct equals
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{
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static bool apply(value_null, value_unicode_string const& rhs)
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{
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return false;
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}
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template <typename T>
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static auto apply(T const& lhs, T const& rhs)
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-> decltype(lhs == rhs)
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{
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return lhs == rhs;
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}
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};
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struct not_equal
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{
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// back compatibility shim to equate empty string with null for != test
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// https://github.com/mapnik/mapnik/issues/1859
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// TODO - consider removing entire specialization at Mapnik 3.1.x
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static bool apply(value_null, value_unicode_string const& rhs)
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{
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if (rhs.isEmpty()) return false;
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return true;
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}
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template <typename T>
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static auto apply(T const& lhs, T const& rhs)
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-> decltype(lhs != rhs)
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{
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return lhs != rhs;
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}
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};
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struct greater_than
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{
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static bool apply(value_null, value_unicode_string const& rhs)
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{
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return false;
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}
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template <typename T>
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static auto apply(T const& lhs, T const& rhs)
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-> decltype(lhs > rhs)
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{
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return lhs > rhs;
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}
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};
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struct greater_or_equal
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{
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static bool apply(value_null, value_unicode_string const& rhs)
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{
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return false;
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}
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template <typename T>
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static auto apply(T const& lhs, T const& rhs)
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-> decltype(lhs >= rhs)
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{
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return lhs >= rhs;
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}
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};
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struct less_than
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{
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static bool apply(value_null, value_unicode_string const& rhs)
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{
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return false;
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}
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template <typename T>
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static auto apply(T const& lhs, T const& rhs)
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-> decltype(lhs < rhs)
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{
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return lhs < rhs;
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}
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};
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struct less_or_equal
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{
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static bool apply(value_null, value_unicode_string const& rhs)
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{
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return false;
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}
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template <typename T>
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static auto apply(T const& lhs, T const& rhs)
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-> decltype(lhs <= rhs)
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{
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return lhs <= rhs;
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}
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};
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}
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template <typename Op, bool default_result>
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struct comparison
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{
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// special case for unicode_strings (fixes MSVC C4800)
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bool operator()(value_unicode_string const& lhs,
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value_unicode_string const& rhs) const
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{
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return Op::apply(lhs, rhs) ? true : false;
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}
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//////////////////////////////////////////////////////////////////////////
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// special case for unicode_string and value_null
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//////////////////////////////////////////////////////////////////////////
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bool operator()(value_null const& lhs, value_unicode_string const& rhs) const
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{
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return Op::apply(lhs, rhs);
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}
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//////////////////////////////////////////////////////////////////////////
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// same types
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template <typename T>
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bool operator()(T lhs, T rhs) const
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{
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return Op::apply(lhs, rhs);
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}
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// both types are arithmetic - promote to the common type
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template <typename T, typename U, typename std::enable_if<both_arithmetic<T, U>::value, int>::type = 0>
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bool operator()(T const& lhs, U const& rhs) const
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{
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using common_type = typename std::common_type<T, U>::type;
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return Op::apply(static_cast<common_type>(lhs), static_cast<common_type>(rhs));
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}
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//
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template <typename T, typename U, typename std::enable_if<!both_arithmetic<T, U>::value, int>::type = 0>
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bool operator()(T const& lhs, U const& rhs) const
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{
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return default_result;
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}
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};
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template <typename V>
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struct add
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{
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using value_type = V;
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value_type operator()(value_unicode_string const& lhs,
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value_unicode_string const& rhs) const
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{
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return lhs + rhs;
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}
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value_type operator()(value_null const& lhs,
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value_null const& rhs) const
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{
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return lhs;
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}
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value_type operator()(value_unicode_string const& lhs, value_null) const
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{
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return lhs;
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}
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value_type operator()(value_null, value_unicode_string const& rhs) const
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{
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return rhs;
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}
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template <typename L>
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value_type operator()(L const& lhs, value_null const&) const
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{
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return lhs;
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}
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template <typename R>
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value_type operator()(value_null const&, R const& rhs) const
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{
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return rhs;
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}
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template <typename L>
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value_type operator()(L const& lhs, value_unicode_string const& rhs) const
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{
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std::string val;
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if (util::to_string(val, lhs))
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return value_unicode_string(val.c_str()) + rhs;
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return rhs;
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}
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template <typename R>
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value_type operator()(value_unicode_string const& lhs, R const& rhs) const
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{
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std::string val;
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if (util::to_string(val, rhs))
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return lhs + value_unicode_string(val.c_str());
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return lhs;
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}
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template <typename T1, typename T2>
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value_type operator()(T1 const& lhs, T2 const& rhs) const
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{
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return typename std::common_type<T1, T2>::type{lhs + rhs};
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}
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value_type operator()(value_bool lhs, value_bool rhs) const
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{
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return value_integer(lhs + rhs);
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}
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};
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template <typename V>
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struct sub
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{
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using value_type = V;
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value_type operator()(value_null const& lhs,
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value_null const& rhs) const
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{
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return lhs;
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}
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value_type operator()(value_null, value_unicode_string const& rhs) const
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{
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return rhs;
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}
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value_type operator()(value_unicode_string const& lhs, value_null) const
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{
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return lhs;
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}
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template <typename R>
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value_type operator()(value_unicode_string const& lhs, R const&) const
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{
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return lhs;
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}
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template <typename L>
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value_type operator()(L const&, value_unicode_string const& rhs) const
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{
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return rhs;
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}
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template <typename L>
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value_type operator()(L const& lhs, value_null const&) const
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{
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return lhs;
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}
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template <typename R>
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value_type operator()(value_null const&, R const& rhs) const
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{
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return rhs;
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}
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template <typename T>
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value_type operator()(T lhs, T rhs) const
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{
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return lhs - rhs;
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}
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value_type operator()(value_unicode_string const&,
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value_unicode_string const&) const
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{
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return value_type();
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}
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template <typename T1, typename T2>
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value_type operator()(T1 const& lhs, T2 const& rhs) const
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{
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return typename std::common_type<T1, T2>::type{lhs - rhs};
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}
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value_type operator()(value_bool lhs, value_bool rhs) const
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{
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return value_integer(lhs - rhs);
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}
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};
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template <typename V>
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struct mult
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{
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using value_type = V;
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value_type operator()(value_null const& lhs,
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value_null const& rhs) const
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{
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return lhs;
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}
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value_type operator()(value_unicode_string const& lhs, value_null) const
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{
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return lhs;
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}
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value_type operator()(value_null, value_unicode_string const& rhs) const
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{
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return rhs;
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}
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template <typename L>
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value_type operator()(L const& lhs, value_null const&) const
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{
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return lhs;
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}
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template <typename R>
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value_type operator()(value_null const&, R const& rhs) const
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{
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return rhs;
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}
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template <typename R>
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value_type operator()(value_unicode_string const& lhs, R const&) const
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{
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return lhs;
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}
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template <typename L>
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value_type operator()(L const&, value_unicode_string const& rhs) const
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{
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return rhs;
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}
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template <typename T>
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value_type operator()(T lhs, T rhs) const
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{
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return lhs * rhs;
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}
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value_type operator()(value_unicode_string const&,
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value_unicode_string const&) const
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{
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return value_type();
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}
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template <typename T1, typename T2>
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value_type operator()(T1 const& lhs, T2 const& rhs) const
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{
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return typename std::common_type<T1, T2>::type{lhs * rhs};
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}
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value_type operator()(value_bool lhs, value_bool rhs) const
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{
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return value_integer(lhs * rhs);
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}
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};
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template <typename V>
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struct div
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{
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using value_type = V;
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value_type operator()(value_null const& lhs,
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value_null const& rhs) const
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{
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return lhs;
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}
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value_type operator()(value_unicode_string const& lhs, value_null) const
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{
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return lhs;
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}
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value_type operator()(value_null, value_unicode_string const& rhs) const
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{
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return rhs;
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}
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template <typename L>
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value_type operator()(L const& lhs, value_null const&) const
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{
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return lhs;
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}
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template <typename R>
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value_type operator()(value_null const&, R const& rhs) const
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{
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return rhs;
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}
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template <typename T>
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value_type operator()(T lhs, T rhs) const
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{
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if (rhs == 0) return value_type();
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return lhs / rhs;
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}
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value_type operator()(value_bool lhs, value_bool rhs) const
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{
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if (rhs == 0) return lhs;
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return value_integer(lhs) / value_integer(rhs);
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}
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value_type operator()(value_unicode_string const&,
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value_unicode_string const&) const
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{
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return value_type();
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}
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template <typename R>
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value_type operator()(value_unicode_string const& lhs, R const&) const
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{
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return lhs;
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}
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template <typename L>
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value_type operator()(L const&, value_unicode_string const& rhs) const
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{
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return rhs;
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}
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template <typename T1, typename T2>
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value_type operator()(T1 const& lhs, T2 const& rhs) const
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{
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if (rhs == 0) return value_type();
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using common_type = typename std::common_type<T1, T2>::type;
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return common_type(lhs) / common_type(rhs);
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}
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};
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template <typename V>
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struct mod
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{
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using value_type = V;
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template <typename T1, typename T2>
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value_type operator()(T1 const& lhs, T2 const&) const
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{
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return lhs;
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}
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template <typename T>
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value_type operator()(T lhs, T rhs) const
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{
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return lhs % rhs;
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}
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value_type operator()(value_unicode_string const&,
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value_unicode_string const&) const
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{
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return value_type();
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}
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value_type operator()(value_bool,
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value_bool) const
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{
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return false;
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}
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value_type operator()(value_double lhs, value_integer rhs) const
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{
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return std::fmod(lhs, static_cast<value_double>(rhs));
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}
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value_type operator()(value_integer lhs, value_double rhs) const
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{
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return std::fmod(static_cast<value_double>(lhs), rhs);
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}
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value_type operator()(value_double lhs, value_double rhs) const
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{
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return std::fmod(lhs, rhs);
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}
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};
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template <typename V>
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struct negate
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{
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using value_type = V;
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template <typename T>
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value_type operator()(T val) const
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{
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return -val;
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}
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value_type operator()(value_null val) const
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{
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return val;
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}
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value_type operator()(value_bool val) const
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{
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return val ? value_integer(-1) : value_integer(0);
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}
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value_type operator()(value_unicode_string const&) const
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{
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return value_type();
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}
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};
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// converters
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template <typename T>
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struct convert
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{
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};
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|
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template <>
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struct convert<value_bool>
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{
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value_bool operator()(value_bool val) const
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{
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return val;
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}
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value_bool operator()(value_unicode_string const& ustr) const
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{
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return !ustr.isEmpty();
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}
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|
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value_bool operator()(value_null const&) const
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{
|
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return false;
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}
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|
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template <typename T>
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value_bool operator()(T val) const
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{
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return val > 0 ? true : false;
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}
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};
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|
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template <>
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struct convert<value_double>
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{
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value_double operator()(value_double val) const
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{
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return val;
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}
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value_double operator()(value_integer val) const
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{
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return static_cast<value_double>(val);
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}
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value_double operator()(value_bool val) const
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{
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return static_cast<value_double>(val);
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}
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value_double operator()(std::string const& val) const
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{
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value_double result;
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if (util::string2double(val, result))
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return result;
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return 0;
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}
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|
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value_double operator()(value_unicode_string const& val) const
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{
|
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std::string utf8;
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val.toUTF8String(utf8);
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return operator()(utf8);
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}
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|
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value_double operator()(value_null const&) const
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{
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return 0.0;
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}
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};
|
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|
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template <>
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struct convert<value_integer>
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{
|
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value_integer operator()(value_integer val) const
|
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{
|
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return val;
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}
|
|
|
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value_integer operator()(value_double val) const
|
|
{
|
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return static_cast<value_integer>(rint(val));
|
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}
|
|
|
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value_integer operator()(value_bool val) const
|
|
{
|
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return static_cast<value_integer>(val);
|
|
}
|
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|
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value_integer operator()(std::string const& val) const
|
|
{
|
|
value_integer result;
|
|
if (util::string2int(val, result))
|
|
return result;
|
|
return value_integer(0);
|
|
}
|
|
|
|
value_integer operator()(value_unicode_string const& val) const
|
|
{
|
|
std::string utf8;
|
|
val.toUTF8String(utf8);
|
|
return operator()(utf8);
|
|
}
|
|
|
|
value_integer operator()(value_null const&) const
|
|
{
|
|
return value_integer(0);
|
|
}
|
|
};
|
|
|
|
template <>
|
|
struct convert<std::string>
|
|
{
|
|
template <typename T>
|
|
std::string operator()(T val) const
|
|
{
|
|
std::string str;
|
|
util::to_string(str, val);
|
|
return str;
|
|
}
|
|
|
|
// specializations
|
|
std::string operator()(value_unicode_string const& val) const
|
|
{
|
|
std::string utf8;
|
|
val.toUTF8String(utf8);
|
|
return utf8;
|
|
}
|
|
|
|
std::string operator()(value_double val) const
|
|
{
|
|
std::string str;
|
|
util::to_string(str, val); // TODO set precision(16)
|
|
return str;
|
|
}
|
|
|
|
std::string operator()(value_bool val) const
|
|
{
|
|
return val ? "true" : "false";
|
|
}
|
|
|
|
std::string operator()(value_null const&) const
|
|
{
|
|
return std::string();
|
|
}
|
|
};
|
|
|
|
struct to_unicode_impl
|
|
{
|
|
|
|
template <typename T>
|
|
value_unicode_string operator()(T val) const
|
|
{
|
|
std::string str;
|
|
util::to_string(str, val);
|
|
return value_unicode_string(str.c_str());
|
|
}
|
|
|
|
// specializations
|
|
value_unicode_string const& operator()(value_unicode_string const& val) const
|
|
{
|
|
return val;
|
|
}
|
|
|
|
value_unicode_string operator()(value_double val) const
|
|
{
|
|
std::string str;
|
|
util::to_string(str, val);
|
|
return value_unicode_string(str.c_str());
|
|
}
|
|
|
|
value_unicode_string operator()(value_bool val) const
|
|
{
|
|
return value_unicode_string(val ? "true" : "false");
|
|
}
|
|
|
|
value_unicode_string operator()(value_null const&) const
|
|
{
|
|
return value_unicode_string();
|
|
}
|
|
};
|
|
|
|
struct to_expression_string_impl
|
|
{
|
|
struct EscapingByteSink : U_NAMESPACE_QUALIFIER ByteSink
|
|
{
|
|
std::string dest_;
|
|
char quote_;
|
|
|
|
explicit EscapingByteSink(char quote)
|
|
: quote_(quote)
|
|
{
|
|
}
|
|
|
|
virtual void Append(const char* data, int32_t n)
|
|
{
|
|
// reserve enough room to hold the appended chunk and quotes;
|
|
// if another chunk follows, or any character needs escaping,
|
|
// the string will grow naturally
|
|
if (dest_.empty())
|
|
{
|
|
dest_.reserve(2 + static_cast<std::size_t>(n));
|
|
dest_.append(1, quote_);
|
|
}
|
|
else
|
|
{
|
|
dest_.reserve(dest_.size() + n + 1);
|
|
}
|
|
|
|
for (auto end = data + n; data < end; ++data)
|
|
{
|
|
if (*data == '\\' || *data == quote_)
|
|
dest_.append(1, '\\');
|
|
dest_.append(1, *data);
|
|
}
|
|
}
|
|
|
|
virtual void Flush()
|
|
{
|
|
if (dest_.empty())
|
|
dest_.append(2, quote_);
|
|
else
|
|
dest_.append(1, quote_);
|
|
}
|
|
};
|
|
|
|
explicit to_expression_string_impl(char quote = '\'')
|
|
: quote_(quote) {}
|
|
|
|
std::string operator()(value_unicode_string const& val) const
|
|
{
|
|
EscapingByteSink sink(quote_);
|
|
val.toUTF8(sink);
|
|
return sink.dest_;
|
|
}
|
|
|
|
std::string operator()(value_integer val) const
|
|
{
|
|
std::string output;
|
|
util::to_string(output, val);
|
|
return output;
|
|
}
|
|
|
|
std::string operator()(value_double val) const
|
|
{
|
|
std::string output;
|
|
util::to_string(output, val); // TODO precision(16)
|
|
return output;
|
|
}
|
|
|
|
std::string operator()(value_bool val) const
|
|
{
|
|
return val ? "true" : "false";
|
|
}
|
|
|
|
std::string operator()(value_null const&) const
|
|
{
|
|
return "null";
|
|
}
|
|
|
|
const char quote_;
|
|
};
|
|
|
|
} // ns detail
|
|
|
|
namespace value_adl_barrier {
|
|
|
|
bool value::operator==(value const& other) const
|
|
{
|
|
return util::apply_visitor(detail::comparison<detail::equals, false>(), *this, other);
|
|
}
|
|
|
|
bool value::operator!=(value const& other) const
|
|
{
|
|
return util::apply_visitor(detail::comparison<detail::not_equal, true>(), *this, other);
|
|
}
|
|
|
|
bool value::operator>(value const& other) const
|
|
{
|
|
return util::apply_visitor(detail::comparison<detail::greater_than, false>(), *this, other);
|
|
}
|
|
|
|
bool value::operator>=(value const& other) const
|
|
{
|
|
return util::apply_visitor(detail::comparison<detail::greater_or_equal, false>(), *this, other);
|
|
}
|
|
|
|
bool value::operator<(value const& other) const
|
|
{
|
|
return util::apply_visitor(detail::comparison<detail::less_than, false>(), *this, other);
|
|
}
|
|
|
|
bool value::operator<=(value const& other) const
|
|
{
|
|
return util::apply_visitor(detail::comparison<detail::less_or_equal, false>(), *this, other);
|
|
}
|
|
|
|
value value::operator-() const
|
|
{
|
|
return util::apply_visitor(detail::negate<value>(), *this);
|
|
}
|
|
|
|
value_bool value::to_bool() const
|
|
{
|
|
return util::apply_visitor(detail::convert<value_bool>(), *this);
|
|
}
|
|
|
|
std::string value::to_expression_string(char quote) const
|
|
{
|
|
return util::apply_visitor(detail::to_expression_string_impl(quote), *this);
|
|
}
|
|
|
|
std::string value::to_string() const
|
|
{
|
|
return util::apply_visitor(detail::convert<std::string>(), *this);
|
|
}
|
|
|
|
value_unicode_string value::to_unicode() const
|
|
{
|
|
return util::apply_visitor(detail::to_unicode_impl(), *this);
|
|
}
|
|
|
|
value_double value::to_double() const
|
|
{
|
|
return util::apply_visitor(detail::convert<value_double>(), *this);
|
|
}
|
|
|
|
value_integer value::to_int() const
|
|
{
|
|
return util::apply_visitor(detail::convert<value_integer>(), *this);
|
|
}
|
|
|
|
bool value::is_null() const
|
|
{
|
|
return util::apply_visitor(mapnik::detail::is_null_visitor(), *this);
|
|
}
|
|
|
|
template <>
|
|
value_double value::convert() const
|
|
{
|
|
return util::apply_visitor(detail::convert<value_double>(), *this);
|
|
}
|
|
|
|
template <>
|
|
value_integer value::convert() const
|
|
{
|
|
return util::apply_visitor(detail::convert<value_integer>(), *this);
|
|
}
|
|
|
|
template <>
|
|
value_bool value::convert() const
|
|
{
|
|
return util::apply_visitor(detail::convert<value_bool>(), *this);
|
|
}
|
|
|
|
template <>
|
|
std::string value::convert() const
|
|
{
|
|
return util::apply_visitor(detail::convert<std::string>(), *this);
|
|
}
|
|
|
|
//
|
|
value operator+(value const& p1, value const& p2)
|
|
{
|
|
return value(util::apply_visitor(detail::add<value>(), p1, p2));
|
|
}
|
|
|
|
value operator-(value const& p1, value const& p2)
|
|
{
|
|
return value(util::apply_visitor(detail::sub<value>(), p1, p2));
|
|
}
|
|
|
|
value operator*(value const& p1, value const& p2)
|
|
{
|
|
return value(util::apply_visitor(detail::mult<value>(), p1, p2));
|
|
}
|
|
|
|
value operator/(value const& p1, value const& p2)
|
|
{
|
|
return value(util::apply_visitor(detail::div<value>(), p1, p2));
|
|
}
|
|
|
|
value operator%(value const& p1, value const& p2)
|
|
{
|
|
return value(util::apply_visitor(detail::mod<value>(), p1, p2));
|
|
}
|
|
|
|
} // namespace value_adl_barrier
|
|
} // namespace mapnik
|