66 lines
1.3 KiB
C
66 lines
1.3 KiB
C
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#include <string>
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#include <iostream>
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using namespace std;
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class Expression
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{
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public:
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Expression(){}
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virtual ~Expression(){}
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virtual bool interpret(string context) = 0;
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};
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class TerminalExpression: public Expression
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{
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public:
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TerminalExpression(string data) : data(data)
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{
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cout << "init TerminalExpression" << endl;
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}
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bool interpret(string context)
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{
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if(context.find(data) != string::npos)
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{
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return true;
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}
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return false;
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}
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private:
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string data;
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};
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class OrExpression: public Expression
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{
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public:
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OrExpression(Expression *exp1, Expression *exp2) : exp1(exp1), exp2(exp2)
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{
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cout << "init OrExpression" << endl;
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}
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bool interpret(string context)
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{
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return exp1->interpret(context) || exp2->interpret(context);
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}
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private:
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Expression *exp1 = nullptr;
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Expression *exp2 = nullptr;
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};
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class AndExpression: public Expression
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{
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public:
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AndExpression(Expression *exp1, Expression *exp2) : exp1(exp1), exp2(exp2)
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{
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cout << "init AndExpression" << endl;
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}
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bool interpret(string context)
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{
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return exp1->interpret(context) && exp2->interpret(context);
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}
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private:
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Expression *exp1 = nullptr;
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Expression *exp2 = nullptr;
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};
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