130 lines
2.4 KiB
C++
130 lines
2.4 KiB
C++
#ifndef __INTERPRETOR_PATTERN_H__
|
||
#define __INTERPRETOR_PATTERN_H__
|
||
|
||
#include <vector>
|
||
using namespace std;
|
||
|
||
// 抽象表达式类
|
||
class AbstractNode
|
||
{
|
||
public:
|
||
AbstractNode(){}
|
||
virtual ~AbstractNode(){}
|
||
// 声明抽象接口
|
||
virtual char interpret() = 0;
|
||
};
|
||
|
||
// 终结符表达式：ValueNode
|
||
class ValueNode :public AbstractNode
|
||
{
|
||
public :
|
||
ValueNode(){}
|
||
ValueNode(int iValue){
|
||
this->value = iValue;
|
||
}
|
||
// 实现解释操作
|
||
char interpret(){
|
||
return value;
|
||
}
|
||
private:
|
||
int value;
|
||
};
|
||
|
||
// 终结符表达式：OperationNode
|
||
class OperatorNode :public AbstractNode
|
||
{
|
||
public:
|
||
OperatorNode(){}
|
||
OperatorNode(string iOp){
|
||
this->op = iOp;
|
||
}
|
||
// 实现解释操作
|
||
char interpret(){
|
||
if (op == "and"){
|
||
return '&';
|
||
}
|
||
else if (op == "or"){
|
||
return '|';
|
||
}
|
||
return 0;
|
||
}
|
||
private:
|
||
string op;
|
||
};
|
||
|
||
// 非终结符表达式：SentenceNode
|
||
class SentenceNode :public AbstractNode
|
||
{
|
||
public:
|
||
SentenceNode(){}
|
||
SentenceNode(AbstractNode *iLeftNode,
|
||
AbstractNode *iRightNode, AbstractNode* iOperatorNode){
|
||
this->leftNode = iLeftNode;
|
||
this->rightNode = iRightNode;
|
||
this->operatorNode = iOperatorNode;
|
||
}
|
||
char interpret(){
|
||
if (operatorNode->interpret() == '&'){
|
||
return leftNode->interpret()&rightNode->interpret();
|
||
}
|
||
else{
|
||
return leftNode->interpret()|rightNode->interpret();
|
||
}
|
||
return 0;
|
||
}
|
||
private:
|
||
AbstractNode *leftNode;
|
||
AbstractNode *rightNode;
|
||
AbstractNode *operatorNode;
|
||
};
|
||
|
||
// 处理者
|
||
class Handler
|
||
{
|
||
public:
|
||
Handler(){}
|
||
void setInput(string iInput){
|
||
this->input = iInput;
|
||
}
|
||
void handle(){
|
||
AbstractNode *left = NULL;
|
||
AbstractNode *right = NULL;
|
||
AbstractNode *op = NULL;
|
||
AbstractNode *sentence = NULL;
|
||
string iInput = this->input;
|
||
vector<string>inputList;
|
||
char* inputCh = const_cast<char*>(iInput.c_str());
|
||
char *token = strtok(inputCh, " ");
|
||
while (token != NULL){
|
||
inputList.push_back(token);
|
||
token = strtok(NULL, " ");
|
||
}
|
||
for (int i = 0; i < inputList.size() - 2; i += 2){
|
||
left = new ValueNode(*(inputList[i].c_str()));
|
||
op = new OperatorNode(inputList[i + 1]);
|
||
right = new ValueNode(*(inputList[i+2].c_str()));
|
||
sentence = new SentenceNode(left, right, op);
|
||
inputList[i + 2] = string(1, sentence->interpret());
|
||
}
|
||
string tmpRes = inputList[inputList.size() - 1];
|
||
if (tmpRes == "1"){
|
||
result = 1;
|
||
}
|
||
else if (tmpRes == "0"){
|
||
result = 0;
|
||
}
|
||
else{
|
||
result = -1;
|
||
}
|
||
this->output();
|
||
}
|
||
void output(){
|
||
printf("%s = %d\n", input.c_str(), result);
|
||
}
|
||
private:
|
||
string input;
|
||
char result;
|
||
};
|
||
|
||
|
||
#endif //__INTERPRETOR_PATTERN_H__
|