Delete Parserv2.cpp
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Brandon Jackson
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391cc2ab50
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1 changed files with 0 additions and 196 deletions
196
Parserv2.cpp
196
Parserv2.cpp
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#include <string>
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#include <iostream>
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#include <sstream>
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#include <vector>
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#include <string>
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using namespace std;
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vector<string> tokenize(string ss)
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{
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string tempString;
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stringstream lineStream(ss);
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vector<string> output;
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while (lineStream >> tempString)
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{
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output.push_back(tempString);
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}
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//testing---------------
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cout<<"TokenList: ";
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for (int i = 0; i <output.size(); ++i)
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{
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cout<<output[i]<<" ";
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}
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//----------------------
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return output;
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}
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void displayTokenList(vector<string> input)
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{
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cout<<"TokenList: "<<endl;
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for (int i = 0; i < input.size(); ++i)
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{
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cout<<input[i]<<endl;
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}
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}
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vector<string> insertCMD(vector<string> input)
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{
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//relation name will be the first element of the vector of data returned by this function
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vector<string> output;
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if (input[0] == "INTO")
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{
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input.erase(input.begin());
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output.push_back(input[0]); //pushing relation name
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input.erase(input.begin());
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if (input[0] == "VALUES" && input[1] == "FROM")
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{
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input.erase(input.begin());
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input.erase(input.begin());
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if(input[0] == "(")
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{
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input.erase(input.begin());
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while(input[0] != ")") //inserting all values to relation
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//for (int i = 0; i < 2; ++i)
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{
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if (input[0] == ",") input.erase(input.begin());
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output.push_back(input[0]);
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input.erase(input.begin());
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}
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return output;
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}
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else cout<<"Syntax error!"<<endl;
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}
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else cout<<"Syntax error!"<<endl;
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}
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else cout<<"Syntax error!"<<endl;
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}
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vector<string> showCMD(vector<string> input)
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{
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if (input.size() > 3)
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{
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cout<<"Syntax error!"<<endl;
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}
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cout<<"\nPassing the following arguments to dbEngine: "<<endl;
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cout << "command :" << input[0] << endl;
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cout << "relation name / expression: "<< input[1] << endl;
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return input;
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}
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vector<string> exitCMD(vector<string> input)
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{
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if (input[1] != ";")
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{
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cout<<"ERROR: missing semicolon!"<<endl;
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return input;
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}
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if (input[0] != "EXIT") {
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cout<<"Wrong function/syntax error!"<<endl;
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return input;
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}
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cout<<"Passing command: "<< input[0] <<endl;
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return input;
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}
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vector<string> createCMD(vector<string> input)
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{
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if (input[0] != "CREATE") {
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cout << "Error: create keyword is missing." <<endl;
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return input;
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}
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cout << "\nPassing the following arguments to dbEngine: " << endl;
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// CREATE TABLE relation-name ( typed-attribute-list ) PRIMARY KEY ( attribute-list )
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cout << "command :" << input[0] << endl;
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cout << "argument: " << input[1] << endl;
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return input;
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}
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vector<string> openCMD(vector<string> input){
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if (input[0] != "OPEN") {
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cout << "Error: open keyword is missing." <<endl;
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return input;
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}
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cout << "\nPassing the following arguments to dbEngine: " << endl;
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cout << "command :" << input[0] << endl;
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cout << "relation: " << input[1] << endl;
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}
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vector<string> closeCMD(vector<string> input){
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if (input[0] != "CLOSE") {
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cout << "Error: close keyword is missing." <<endl;
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return input;
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}
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cout << "\nPassing the following arguments to dbEngine: " << endl;
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cout << "command :" << input[0] << endl;
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cout << "relation: " << input[1] << endl;
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return input;
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}
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vector<string> saveCMD(vector<string> input){
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if (input[0] != "SAVE") {
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cout << "Error: save keyword is missing." <<endl;
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return input;
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}
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cout << "\nPassing the following arguments to dbEngine: " << endl;
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cout << "command :" << input[0] << endl;
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cout << "relation: " << input[1] << endl;
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return input;
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}
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vector<string> updateCMD(vector<string> input){
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//UPDATE relation-name SET attribute-name = literal { , attribute-name = literal } WHERE condition
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}
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vector<string> deleteCMD(vector<string> input){
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//DELETE FROM relation-name WHERE condition
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if (input[0] != "DELETE") {
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cout << "Error: save keyword is missing." <<endl;
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return input;
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}
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cout << "\nPassing the following arguments to dbEngine: " << endl;
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cout << "command :" << input[0] << endl;
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cout << "relation: " << input[2] << endl;
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cout << "condition: " << input[5] << input[6] << input[7] << endl;
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return input;
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}
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int main () {
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string s = "DELETE FROM animals WHERE ( age == 12 ) ;";
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vector<string> listOfTokens = tokenize(s);
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deleteCMD(listOfTokens);
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}
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