forked from enlightenment/efl
98 lines
2.3 KiB
C++
98 lines
2.3 KiB
C++
/*
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* Copyright 2019 by its authors. See AUTHORS.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef EOLIAN_CXX_GRAMMAR_INDENTATION_HPP
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#define EOLIAN_CXX_GRAMMAR_INDENTATION_HPP
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#include "grammar/generator.hpp"
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#include "grammar/attributes.hpp"
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namespace efl { namespace eolian { namespace grammar {
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struct scope_tab_generator
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{
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constexpr scope_tab_generator(int n, int m = 4)
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: n(n)
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, m(m)
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{}
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constexpr scope_tab_generator(scope_tab_generator const&) = default;
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scope_tab_generator& operator=(scope_tab_generator const&) = default;
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template <typename OutputIterator, typename Context>
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bool generate(OutputIterator sink, attributes::unused_type, Context const&) const
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{
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for(int i = 0; i != n; ++i)
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{
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for(int j = 0; j != m; ++j)
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*sink++ = ' ';
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}
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return true;
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}
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constexpr scope_tab_generator inc(int nplus = 1) const
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{
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return {n+nplus, m};
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}
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constexpr scope_tab_generator dec(int nminus = 1) const
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{
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return {n-nminus, m};
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}
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int n;
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int m;
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explicit operator std::string() const
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{
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return std::string(n * m, ' ');
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}
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};
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template <>
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struct is_eager_generator<scope_tab_generator> : std::true_type {};
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template <>
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struct is_generator<scope_tab_generator> : std::true_type {};
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struct scope_tab_terminal
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{
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scope_tab_generator operator()(int n, int m = 4) const
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{
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return {n, m};
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}
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operator scope_tab_generator() const
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{
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return {1};
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}
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explicit operator std::string() const
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{
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return static_cast<std::string>(scope_tab_generator{1});
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}
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} const scope_tab = {};
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template <>
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struct is_generator<scope_tab_terminal> : std::true_type {};
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scope_tab_generator as_generator(scope_tab_terminal)
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{
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return scope_tab_generator(1);
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}
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} } }
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#endif
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