Java Code: Below is Parser.java and there are errors. getType() and getStart() is undefined for the type Optional and there is an error in addNode(). Make sure to get rid of all the errors in the code. Attached is images of the errors. Parser.java import java.text.ParseException; import java.util.LinkedList; import java.util.List; import java.util.Optional; import javax.swing.ActionMap; public class Parser { private TokenHandler tokenHandler; private LinkedList tokens; public Parser(LinkedList tokens) { this.tokenHandler = new TokenHandler(tokens); this.tokens = tokens; } public boolean AcceptSeparators() { boolean foundSeparator = false; while (tokenHandler.MoreTokens()) { Optional currentToken = tokenHandler.getCurrentToken(); if (currentToken.getType() == Token.TokenType.NEWLINE || currentToken.getType() == Token.TokenType.SEMICOLON) { tokenHandler.consumeMatchedToken(); foundSeparator = true; } else { break; } } return foundSeparator; } public ProgramNode Parse() throws ParseException { ProgramNode programNode = new ProgramNode(null, 0); while (tokenHandler.MoreTokens()) { if (!ParseFunction(programNode) && !parseAction(programNode)) { throw new ParseException("Unexpected token: " + tokenHandler.getCurrentToken(), tokenHandler.getCurrentToken().getStart()); } } return programNode; } private boolean ParseFunction(ProgramNode programNode) { Optional functionNameToken = tokenHandler.getCurrentToken(); if (tokenHandler.MatchAndRemove(Token.TokenType.IDENTIFIER) != null) { FunctionDefinitionNode functionNode = new FunctionDefinitionNode(functionNameToken.getType()); programNode.addNode(functionNode); if (tokenHandler.MatchAndRemove(Token.TokenType.LPAREN) != null) { if (tokenHandler.MatchAndRemove(Token.TokenType.RPAREN) != null) { AcceptSeparators(); return true; } } } return false; } private boolean parseAction(ProgramNode programNode) { Optional functionNameToken = tokenHandler.getCurrentToken(); if (tokenHandler.MatchAndRemove(Token.TokenType.IDENTIFIER) != null) { ActionMap actionMap = new ActionMap(tokenHandler.getLastMatchedToken().getType()); programNode.addNode(actionMap); AcceptSeparators(); return true; } return false; } }

Java Code: Below is Parser.java and there are errors. getType() and getStart() is undefined for the type Optional and there is an error in addNode(). Make sure to get rid of all the errors in the code. Attached is images of the errors. Parser.java import java.text.ParseException; import java.util.LinkedList; import java.util.List; import java.util.Optional; import javax.swing.ActionMap; public class Parser { private TokenHandler tokenHandler; private LinkedList tokens; public Parser(LinkedList tokens) { this.tokenHandler = new TokenHandler(tokens); this.tokens = tokens; } public boolean AcceptSeparators() { boolean foundSeparator = false; while (tokenHandler.MoreTokens()) { Optional currentToken = tokenHandler.getCurrentToken(); if (currentToken.getType() == Token.TokenType.NEWLINE || currentToken.getType() == Token.TokenType.SEMICOLON) { tokenHandler.consumeMatchedToken(); foundSeparator = true; } else { break; } } return foundSeparator; } public ProgramNode Parse() throws ParseException { ProgramNode programNode = new ProgramNode(null, 0); while (tokenHandler.MoreTokens()) { if (!ParseFunction(programNode) && !parseAction(programNode)) { throw new ParseException("Unexpected token: " + tokenHandler.getCurrentToken(), tokenHandler.getCurrentToken().getStart()); } } return programNode; } private boolean ParseFunction(ProgramNode programNode) { Optional functionNameToken = tokenHandler.getCurrentToken(); if (tokenHandler.MatchAndRemove(Token.TokenType.IDENTIFIER) != null) { FunctionDefinitionNode functionNode = new FunctionDefinitionNode(functionNameToken.getType()); programNode.addNode(functionNode); if (tokenHandler.MatchAndRemove(Token.TokenType.LPAREN) != null) { if (tokenHandler.MatchAndRemove(Token.TokenType.RPAREN) != null) { AcceptSeparators(); return true; } } } return false; } private boolean parseAction(ProgramNode programNode) { Optional functionNameToken = tokenHandler.getCurrentToken(); if (tokenHandler.MatchAndRemove(Token.TokenType.IDENTIFIER) != null) { ActionMap actionMap = new ActionMap(tokenHandler.getLastMatchedToken().getType()); programNode.addNode(actionMap); AcceptSeparators(); return true; } return false; } }

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Java Code: Below is Parser.java and there are errors. getType() and getStart() is undefined for the type Optional<Token> and there is an error in addNode(). Make sure to get rid of all the errors in the code. Attached is images of the errors.

Parser.java

import java.text.ParseException;
import java.util.LinkedList;
import java.util.List;
import java.util.Optional;

import javax.swing.ActionMap;

public class Parser {

private TokenHandler tokenHandler;
private LinkedList<Token> tokens;

public Parser(LinkedList<Token> tokens) {
this.tokenHandler = new TokenHandler(tokens);
this.tokens = tokens;
}

public boolean AcceptSeparators() {
boolean foundSeparator = false;
while (tokenHandler.MoreTokens()) {
Optional<Token> currentToken = tokenHandler.getCurrentToken();
if (currentToken.getType() == Token.TokenType.NEWLINE || currentToken.getType() == Token.TokenType.SEMICOLON) {
tokenHandler.consumeMatchedToken();
foundSeparator = true;
} else {
break;
}
}
return foundSeparator;
}

public ProgramNode Parse() throws ParseException {
ProgramNode programNode = new ProgramNode(null, 0);
while (tokenHandler.MoreTokens()) {
if (!ParseFunction(programNode) && !parseAction(programNode)) {
throw new ParseException("Unexpected token: " + tokenHandler.getCurrentToken(), tokenHandler.getCurrentToken().getStart());
}
}
return programNode;
}

private boolean ParseFunction(ProgramNode programNode) {
Optional<Token> functionNameToken = tokenHandler.getCurrentToken();
if (tokenHandler.MatchAndRemove(Token.TokenType.IDENTIFIER) != null) {
FunctionDefinitionNode functionNode = new FunctionDefinitionNode(functionNameToken.getType());
programNode.addNode(functionNode);
if (tokenHandler.MatchAndRemove(Token.TokenType.LPAREN) != null) {
if (tokenHandler.MatchAndRemove(Token.TokenType.RPAREN) != null) {
AcceptSeparators();
return true;
}
}
}
return false;
}

private boolean parseAction(ProgramNode programNode) {
Optional<Token> functionNameToken = tokenHandler.getCurrentToken();
if (tokenHandler.MatchAndRemove(Token.TokenType.IDENTIFIER) != null) {
ActionMap actionMap = new ActionMap(tokenHandler.getLastMatchedToken().getType());
programNode.addNode(actionMap);
AcceptSeparators();
return true;
}
return false;
}
}

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}
public ProgramNode Parse() throws ParseException {
ProgramNode programNode = new ProgramNode(null, 0);
while (tokenHandler. More Tokens()) {
if (!ParseFunction (programNode) && !parseAction(programNode)) {|
throw new ParseException ("Unexpected token: " + tokenHandler.getCurrentToken(), tokenHandler.ge
}
}
private boolean ParseFunction (ProgramNode programNode) {
Optional<Token > functionNameToken = tokenHandler.getCurrentToken();
if (tokenHandler.MatchAnd Remove(Token. TokenType.IDENTIFIER) != null) {
FunctionDefinitionNode functionNode = new FunctionDefinitionNode (functionName Token.getType());
}
}
return programNode;
}
programNode.addNode(functionNode);
if (tokenHandler.MatchAnd Remove(Token. TokenType.LPAREN) != null) {
if (tokenHandler.MatchAndRemove (Token. TokenType.RPAREN) != null) {
AcceptSeparators();
return true;
}
}
}
return false;
private boolean parseAction (ProgramNode programNode) {
Optional<Token› functionNameToken = tokenHandler.getCurrentToken();
if (tokenHandler.MatchAnd Remove (Token. Token Type. IDENTIFIER) != null) {
ActionMap actionMap = new Action Map (tokenHandler.getLast Matched Token ().getType());
programNode.addNode(actionMap);
AcceptSeparators();
return true;
}
return false;
#mypack
✓ Parser
.Parser(LinkedList<Token>)
AcceptSeparators(): boolean
Parse(): ProgramNode
parseAction(ProgramNode): boolean
ParseFunction(ProgramNode): boolean
The method getType() is undefined for the type Optional <Token>
Press 'F2' for focus

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}
public ProgramNode Parse() throws ParseException {
ProgramNode programNode = new ProgramNode (null, 0);
while (tokenHandler. More Tokens ()) {
}
}
if (!ParseFunction (programNode) && !parseAction(programNode)) {|
throw new ParseException ("Unexpected token: " + tokenHandler.getCurrentToken(), tokenHandler.ge
}
private boolean ParseFunction (ProgramNode programNode) {
Optional<Token› functionNameToken = tokenHandler.getCurrentToken();
if (tokenHandler.MatchAnd Remove (Token. TokenType.IDENTIFIER) != null) {
FunctionDefinitionNode functionNode = new FunctionDefinitionNode (functionName Token.getType());
programNode.addNode (functionNode);
}
return programNode;
}
if (tokenHandler.MatchAnd Remove (Token. TokenType.LPAREN) != null) {
if (tokenHandler.MatchAnd Remove (Token. TokenType.RPAREN) != null) {
AcceptSeparators();
return true;
}
}
return false;
private boolean parseAction (ProgramNode programNode) {
Optional<Token> functionNameToken = tokenHandler.getCurrentToken();
if (tokenHandler.MatchAndRemove (Token. TokenType.IDENTIFIER) != null) {
ActionMap actionMap = new ActionMap (tokenHandler.getLastMatchedToken().getType());
programNode.addNode (actionMap);
AcceptSepara
return true;
}
return false;
The method addNode(ActionMap) is undefined for the type ProgramNode
2 quick fixes available:
• Create method 'addNode(Action Map) in type 'ProgramNode'
Add cast to 'programNode'
Press 'F2' for focus

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