74 lines
1.4 KiB
C++
74 lines
1.4 KiB
C++
/**
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* @file mix_cc/matheval/evaluator.hpp
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* @brief 执行器
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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 evaluator.hpp directly!"
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#endif
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#pragma once
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#include "ast.hpp"
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#include <map>
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#include <string>
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namespace mix_cc{
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namespace matheval {
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namespace ast {
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struct ConstantFolder {
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using result_type = operand;
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result_type operator()(nil) const;
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result_type operator()(double n) const;
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result_type operator()(std::string const &c) const;
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result_type operator()(operation const &x, operand const &lhs) const;
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result_type operator()(unary_op const &x) const;
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result_type operator()(binary_op const &x) const;
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result_type operator()(expression const &x) const;
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};
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struct eval {
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using result_type = double;
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explicit eval(std::map<std::string, double> sym) : st(std::move(sym)) {}
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double operator()(nil) const;
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double operator()(double n) const;
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double operator()(std::string const &c) const;
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double operator()(operation const &x, double lhs) const;
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double operator()(unary_op const &x) const;
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double operator()(binary_op const &x) const;
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double operator()(expression const &x) const;
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private:
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std::map<std::string, double> st;
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};
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} // namespace ast
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} // namespace matheval
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}
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