dmspine64backup/Parserv2.cpp

#include <string>       // std::string
#include <iostream>     // std::cout
#include <sstream>      // std::stringstream
#include <vector>
#include <string>

using namespace std;

/*
	as of now, this parser can take a string and break it into tokens
*/


vector<string> tokenize(string ss)
{
	string tempString;
	stringstream lineStream(ss);
	vector<string> output;
	
	while (lineStream >> tempString)
	{
		output.push_back(tempString);
	}
	
	//testing---------------
	cout<<"TokenList: ";
	
	for (int i = 0; i <output.size(); ++i)
	{
		cout<<output[i]<<"  ";
	}
	//----------------------
	
	return output;
	
}


// void par_select(vector<string> input)
// {
	// // if (input[0] != "(")
	// // {
		// // cout<<"ERROR! missing parenthesis"<<endl;
	// // }
	
	// // else
	// // {
		// // input.erase(input.begin());
		
	// // }
	
	// cout<<"par_select function was called!"<<endl;
// }

void displayTokenList(vector<string> input)
{
	cout<<"TokenList: "<<endl;
	for (int i = 0; i < input.size(); ++i)
	{
		cout<<input[i]<<endl;
	}
}


vector<string> insertCMD(vector<string> input)
{
	//relation name will be the first element of the vector of data returned by this function
	vector<string> output;
		
	if (input[0] == "INTO")
	{
		input.erase(input.begin());
		
		output.push_back(input[0]);		//pushing relation name
		
		input.erase(input.begin());
		
		if (input[0] == "VALUES" && input[1] == "FROM")
		{
			input.erase(input.begin());
			input.erase(input.begin());
			
			
			if(input[0] == "(")
			{			
				input.erase(input.begin());
				
				while(input[0] != ")")	//inserting all values to relation
				//for (int i = 0; i < 2; ++i)
				{
					if (input[0] == ",") input.erase(input.begin());
					
					output.push_back(input[0]);
					
					input.erase(input.begin());
				}
				
				return output;
				
			}
			
			else cout<<"Syntax error!"<<endl;
		}
		else cout<<"Syntax error!"<<endl;
		
	}
	
	else cout<<"Syntax error!"<<endl;
	
}

vector<string> showCMD(vector<string> input)
{
	if (input.size() > 3)
	{
		cout<<"Syntax error!"<<endl;
	}
				
	cout<<"\nPassing the following arguments to dbEngine: "<<endl;
	cout<<"command :"<<input[0]<<endl;
	cout<<"argument: "<<input[1]<<endl;	
	
	return input;
}

vector<string> exitCMD(vector<string> input)
{
	if (input[1] != ";")
	{
		cout<<"ERROR: missing semicolon!"<<endl;
	}
	
	if (input[0] != "EXIT") { cout<<"Wrong function/syntax error!"<<endl;}
	cout<<"Passing command: "<<input[0]<<endl;
	
	return input;
}


vector<string> createCMD(vector<string> input)
{
	// //relation name will be the first element of the vector of data returned by this function
	// vector<string> output;
	
	// output.push_back(input[0])	//pushing relation name
	
	
		
	// if (input[0] == "VALUES" && input[1] == "FROM")
	// {
		// input.erase(input.begin());
		// input.erase(input.begin());
			
			
		// if(input[0] == "(")
		// {			
			// input.erase(input.begin());
			
			// while(input[0] != ")")	//inserting all values to relation
			// //for (int i = 0; i < 2; ++i)
			// {
				// if (input[0] == ",") input.erase(input.begin());
				
				// output.push_back(input[0]);
				
				// input.erase(input.begin());
			// }
			
			// return output;
			
		// }
			
		// else cout<<"Syntax error!"<<endl;
	// }
	// else cout<<"Syntax error!"<<endl;
	
}






void par_line(vector<string> input)	//calls par_command() or par_query() depending on first item from token list
{
/*
• Match the first item in the token list and determine weather this is a command or a query.
• Call functions par_command() or par_query();
• After either par_command() or par_query() returns, make sure the line ends properly with “;” token
*/
	string tempChar = input.back();
	if (tempChar != ";")
	{
		cout<<"ERROR! missing semicolon "<<endl;
	}
	
	else
	{
		//command
		// if ( input[0] == "open-cmd" || input[0] == "close-cmd" || 
			 // input[0] == "save-cmd" || input[0] == "exit-cmd" || 
			 // input[0] == "show-cmd" || input[0] == "create-cmd" || 
			 // input[0] == "update-cmd" || input[0] == "insert-cmd" || 
			 // input[0] == "delete-cmd" ) 
			// {
				// par_command(input[0]);
			// }

		//query
		// if ( input[0] == "select" || input[0] == "project" || 
			 // input[0] == "product" || input[0] == "difference" || 
			 // input[0] == "union" || input[0] == "renaming" || 
			 // input[0] == "update-cmd" || input[0] == "insert-cmd" || 
			 // input[0] == "delete-cmd" ) 
			// {
				// par_query(input[0]);
			// }
	
			if ( input[0] == "INSERT")
			{
				cout<<"\nPassing the following arguments to dbEngine: \nCommand: "<<input[0]<<endl;
				input.erase(input.begin());
				vector<string> insertInput = insertCMD(input);
				cout<<"arguments: "<<endl;
				displayTokenList(insertInput);
				
			}
			
			if ( input[0] == "CREATE")
			{
				cout<<"\nPassing the following arguments to dbEngine: \nCommand: "<<input[0]<<endl;
				input.erase(input.begin());
				input.erase(input.begin());
				
				vector<string> insertInput = insertCMD(input);
				cout<<"arguments: "<<endl;
				displayTokenList(insertInput);
				
			}
			
			
			if ( input[0] == "SHOW")
			{
				showCMD(input);			
			}
			
			if ( input[0] == "EXIT")
			{
				exitCMD(input);			
			}
			
			
	}


}



// void par_command(string ss)
// {
	
// }
// void par_query(string ss);
// {
	// if (input[0] == "select");
// }

// void par_insert();
// void par_relationName();
// void par_literals();


// void par_condition();
// void par_conjuction();
// void par_automicexpr():
// /*
// • try to match the current pointer in the token list with the atomic-expr grammar.
// • If an Expr is identified, call par_expr() grammar function
// */
// void par_expr():
// /*
// try to match the current pointer in the token list with the expr grammar.
// Check the current token and identify a proper query (e.g., if project-query is identified, call par_project() grammer function).
// */
// void par_projection():
// /*try to match the current pointer in the token list with the projection grammar
// ◦ Call grammar function par_attribute_list
// ◦ (later on, return a View after the evaluation)
// */
int main () {

	
	string ss = "INSERT INTO animals VALUES FROM  ( Joe , cat , 4 ) ;";
	string ss2 = "SHOW Dogs ;";
	string ss3 = "EXIT ; ";
	
	vector<string> listOfTokens = tokenize(ss);
	vector<string> listOfTokens2 = tokenize(ss2);
	vector<string> listOfTokens3 = tokenize(ss3);
	
	par_line(listOfTokens);
	par_line(listOfTokens2);
	par_line(listOfTokens3);
	
		
}