|
std::string query_word;
};
class NotQuery : public Query_base{
friend Query operator~(const Query&);
NotQuery(const Query& q)
:query(q){//调用Query的拷贝构造函数
std::cout << "NotQuery" << std::endl;
}
std::string rep() const {
return "~(" + query.rep() + ")";
}
virtual NotQuery* clone() const {
return new NotQuery(*this);
}
QueryResult eva l(const TextQuery&)const;
Query query;
};
inline Query operator~(const Query& op){
//return std::shared_ptr<Query_base>(new NotQuery(op));
Query_base* tmp = new NotQuery(op);
return Query(tmp);
}
class BinaryQuery : public Query_base{
protected:
BinaryQuery(const Query& l, const Query& r,
std::string s)
: lhs(l), rhs(r), opSym(s){
std::cout << "BinaryQuery" << std::endl;
}
std::string rep() const {
return "(" + lhs.rep() + " "
+ opSym + " "
+ rhs.rep() + ")";
}
Query lhs, rhs;
std::string opSym;
};
class AndQuery : public BinaryQuery{
friend Query operator&(const Query&, const Query&);
AndQuery(const Query& l, const Query& r)
: BinaryQuery(l, r, "&"){
std::cout << "AndQuery" << std::endl;
}
QueryResult eva l(const TextQuery&) const;
virtual AndQuery* clone() const {
return new AndQuery(*this);
}
};
inline Query operator&(const Query& lhs, const Query& rhs){
return new AndQuery(lhs, rhs);
}
class OrQuery : public BinaryQuery{
friend Query operator|(const Query&, const Query&);
OrQuery(const Query& l, const Query& r)
: BinaryQuery(l, r, "|"){
std::cout << "OrQuery" << std::endl;
}
virtual OrQuery* clone() const {
return new OrQuery(*this);
}
QueryResult eva l(const TextQuery&) const;
};
inline Query operator|(const Query& lhs, const Query& rhs){
return new OrQuery(lhs, rhs);
}
#endif
Query.cpp #include "Query.h"
#include <algorithm>
#include <memory>
/*
std::ostream& operator<<(std::ostream& os, const Query& q){
//Query::rep通过它的Query_base指针对rep()进行虚调用
return os << q.rep();
}
*/
Query::Query(const std::string& s) : q(new WordQuery(s)){
std::cout << "Query pub" << std::endl;
}
QueryResult NotQuery::eva l(const TextQuery& text)const{
//通过Query运算对象对eva l进行虚调用
auto result = query.eva l(text);
//开始时结果set为空
auto ret_lines = std::make_shared<std::set<line_no>>();
auto beg = result.begin();
auto end = result.end();
//对于输入文件的每一行，如果该行不在result当中，则将其添加到ret_lines
auto sz = result.get_file()->size();
for(size_t n = 0; n != sz; ++n){
//如果还没有处理完result的所以行
//检查当前行是否存在
if(beg == end || *beg != n){
ret_lines->insert(n);
}
else if(beg != end){
++beg;//继续获取reslut的下一行
}
}
return QueryResult(rep(), ret_lines, result.get_file());
}
QueryResult AndQuery::eva l(const TextQuery& text)const{
//通过Query成员lhs,rhs进行虚调用
//调用eva l返回每个对象的QueryResult
auto right = rhs.eva l(text);
auto left = lhs.eva l(text);
//保存left和right交集的set
auto ret_lines =
std::make_shared<std::set<line_no>>();
//将两个范围的交集写入一个目的迭代其中。
std::set_intersection(left.begin(), left.end(),
right.begin(), right.end(),
inserter(*ret_lines, ret_li
|