79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
#include "Calc.h"
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#include <iostream>
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#include<algorithm>
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// 静态成员初始化
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Tokenizer Calc::tokenizer;
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InfixToPostfix Calc::converter;
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PostfixEval Calc::evaluator;
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std::unordered_map<std::string, double> Calc::vars = {
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{"PAI", 2 * std::asin(1)},
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{"pi", 3.14159265358979},
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{"e", std::exp(1)}
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};
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// 主计算接口：表达式字符串 -> 计算结果
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double Calc::eval(const string& expression) {
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std::string varName, rightExpr;
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// 判断是否为赋值表达式，例如 x = 3 + sin(2)
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if (is_assign(expression, varName, rightExpr)) {
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vector<Token> tokens = tokenizer.run(rightExpr);
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vector<Token> postfix = converter.run(tokens);
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double val = evaluator.run(postfix, vars);
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vars[varName] = val;
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return val;
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}
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vector<Token> tokens = tokenizer.run(expression);
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vector<Token> postfix = converter.run(tokens);
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return evaluator.run(postfix,vars);
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}
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// 安全计算接口：带 try-catch 封装，返回 bool 标志
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bool Calc::safeEval(const string& expr, double& res) {
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try {
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res = eval(expr);
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return true;
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}
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catch (const exception& e) {
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cerr << "[Error] " << e.what() << endl;
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return false;
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}
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}
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// 调试接口：打印中间结果（token 列表 和 后缀表达式）
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void Calc::debug(const string& expr) {
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try {
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vector<Token> tokens = tokenizer.run(expr);
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cout << "[Token List]" << endl;
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for (const auto& t : tokens) cout << t.value << " ";
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cout << endl;
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vector<Token> postfix = converter.run(tokens);
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cout << "[Postfix]" << endl;
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for (const auto& t : postfix) cout << t.value << " ";
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cout << endl;
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}
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catch (const exception& e) {
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cerr << "[Debug Error] " << e.what() << endl;
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}
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}
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bool Calc::is_assign(const std::string& expr, std::string& varName, std::string& rightExpr) {
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size_t eqPos = expr.find('=');
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if (eqPos != std::string::npos) {
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varName = expr.substr(0, eqPos);
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rightExpr = expr.substr(eqPos + 1);
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// 去除空格
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varName.erase(remove_if(varName.begin(), varName.end(), isspace), varName.end());
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rightExpr.erase(remove_if(rightExpr.begin(), rightExpr.end(), isspace), rightExpr.end());
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// 检查变量是否合法（只含字母）
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return !varName.empty() && std::all_of(varName.begin(), varName.end(), ::isalpha);
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}
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return false;
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}
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