102 lines
2.3 KiB
C++
102 lines
2.3 KiB
C++
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#define MATHEVAL_IMPLEMENTATION
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#include "matheval.hpp"
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#include "ast.hpp"
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#include "evaluator.hpp"
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#include "parser.hpp"
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#include <memory>
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#include <stdexcept>
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#include <string>
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namespace mix_cc {
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namespace matheval {
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class Parser::impl {
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ast::operand ast;
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public:
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void parse(std::string const& expr) {
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auto ast_ = ast::expression{};
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auto first = expr.begin();
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auto last = expr.end();
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boost::spirit::x3::ascii::space_type space;
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bool r = phrase_parse(first, last, grammar(), space, ast_);
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if (!r || first != last) {
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std::string rest(first, last);
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throw std::runtime_error("Parsing failed at " + rest); // NOLINT
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}
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ast = ast_;
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}
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void optimize() { ast = boost::apply_visitor(ast::ConstantFolder{}, ast); }
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double evaluate(std::map<std::string, double> const& st) {
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return boost::apply_visitor(ast::eval{st}, ast);
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}
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};
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Parser::Parser() : pimpl{std::make_unique<Parser::impl>()} {}
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Parser::~Parser() {}
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void Parser::parse(std::string const& expr) { pimpl->parse(expr); }
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void Parser::optimize() { pimpl->optimize(); }
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double Parser::evaluate(std::map<std::string, double> const& st) {
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return pimpl->evaluate(st);
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}
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class Expression::impl {
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ast::operand ast;
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std::map<std::string, double>* st_ptr;
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public:
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void parse(std::string const& expr) {
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auto ast_ = ast::expression{};
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auto first = expr.begin();
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auto last = expr.end();
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boost::spirit::x3::ascii::space_type space;
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bool r = phrase_parse(first, last, grammar(), space, ast_);
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if (!r || first != last) {
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std::string rest(first, last);
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throw std::runtime_error("Parsing failed at " + rest); // NOLINT
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}
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ast = ast_;
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}
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void set_variable(std::map<std::string, double>* const ptr) {
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this->st_ptr = ptr;
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}
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void optimize() { ast = boost::apply_visitor(ast::ConstantFolder{}, ast); }
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double evaluate() { return boost::apply_visitor(ast::eval{*st_ptr}, ast); }
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};
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Expression::Expression(std::string const& math_expr,
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std::map<std::string, double>* const ptr)
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: pimpl{std::make_unique<Expression::impl>()} {
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pimpl->parse(math_expr);
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pimpl->optimize();
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pimpl->set_variable(ptr);
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}
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Expression::~Expression() {}
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double Expression::evaluate() { return pimpl->evaluate(); }
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} // namespace matheval
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} // namespace mix_cc
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