76 lines
1.3 KiB
C++
76 lines
1.3 KiB
C++
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/**
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* @file mix_cc/matheval/ast.hpp
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* @brief 抽象语法树
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* @author Cat (null.null.null@qq.com)
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* @version 0.1
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* @date 2021-09-17
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*
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* Copyright: Baosight Co. Ltd.
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* DO NOT COPY/USE WITHOUT PERMISSION
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*
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*/
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#ifndef MATHEVAL_IMPLEMENTATION
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#error "Do not include ast.hpp directly!"
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#endif
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#pragma once
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#include <boost/spirit/home/x3.hpp>
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#include <boost/spirit/home/x3/support/ast/variant.hpp>
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#include <list>
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#include <string>
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namespace mix_cc {
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namespace matheval {
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namespace x3 = boost::spirit::x3;
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namespace ast {
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struct nil {};
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struct unary_op;
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struct binary_op;
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struct expression;
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// clang-format off
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struct operand : x3::variant<
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nil
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, double
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, std::string
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, x3::forward_ast<unary_op>
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, x3::forward_ast<binary_op>
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, x3::forward_ast<expression>
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> {
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using base_type::base_type;
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using base_type::operator=;
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};
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// clang-format on
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struct unary_op {
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double (*op)(double);
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operand rhs;
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};
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struct binary_op {
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double (*op)(double, double);
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operand lhs;
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operand rhs;
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};
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struct operation {
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double (*op)(double, double);
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operand rhs;
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};
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struct expression {
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operand lhs;
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std::list<operation> rhs;
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};
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} // namespace ast
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} // namespace matheval
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} // namespace mix_cc
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