date and boolean data types added

lexer.cpp

@@ -45,7 +45,7 @@ namespace usql {
 			    match_str = stringLiteral(match_str);
 
 		    if (token_type != TokenType::newline)
-			    m_tokens.push_back(Token{match_str, token_type});
+			    m_tokens.emplace_back(match_str, token_type);
 	    }
 
 	    // DEBUG IT
@@ -56,8 +56,8 @@ namespace usql {
 
     void Lexer::debugTokens() {
 	    int i = 0;
-	    for (std::vector<Token>::iterator it = m_tokens.begin(); it != m_tokens.end(); ++it) {
-		    std::cerr << i << "\t" << it->token_string << std::endl;
+	    for (auto & m_token : m_tokens) {
+		    std::cerr << i << "\t" << m_token.token_string << std::endl;
 		    i++;
 	    }
     }
@@ -197,6 +197,10 @@ namespace usql {
 		    return TokenType::keyword_float;
 	    if (token == "varchar")
 		    return TokenType::keyword_varchar;
+	    if (token == "date")
+		    return TokenType::keyword_date;
+	    if (token == "boolean")
+		    return TokenType::keyword_bool;
 	    if (token == "distinct")
 		    return TokenType::keyword_distinct;
 	    if (token == "or")
@@ -244,7 +248,7 @@ namespace usql {
 	    if (!replace) {
 		    return str;
 	    }
-	    std::string out = "";
+	    std::string out;
 	    out.reserve(str.size());
 
 
@@ -384,6 +388,12 @@ namespace usql {
 		    case TokenType::keyword_varchar:
 			    txt = "varchar";
 			    break;
+		    case TokenType::keyword_date:
+			    txt = "date";
+			    break;
+		    case TokenType::keyword_bool:
+			    txt = "boolean";
+			    break;
 		    case TokenType::keyword_distinct:
 			    txt = "distinct";
 			    break;