I got errors in parser.java. How to create methods in TokenHandler.java for getCurrentToken(), consumeToken(), getLastMatchedToken()? Please create these methods in TokenHandler.java. Fix the error for programNode that is attached. Below is TokenHandler.java TokenHandler.javaimport java.util.LinkedList;import java.util.Optional;import mypack.Token.TokenType; public class TokenHandler { private LinkedList<Token> tokens;// List of tokens public TokenHandler(LinkedList<Token> tokens) { this.tokens = tokens; } public Optional<Token> Peek(int j) { if (j < tokens.size()) { return Optional.of(tokens.get(j)); } else { return Optional.empty(); } } public boolean MoreTokens() { return !tokens.isEmpty(); } public Optional<Token> MatchAndRemove(TokenType t) { if (MoreTokens() && Peek(0).get().getType() == t) { return Optional.of(tokens.remove(0)); // Remove and return a token of specified type } else { return Optional.empty(); } }} 21ជ ជួ ន ដ ឌ ន ន ន ន ន222324252627282930310*323334€3536373839404142430444546474849505152535455565758}}if (currentToken.getType() == Token. TokenType.NEWLINE || currentToken.getType() == Token. TokenType.tokenHandler.consumeToken();foundSeparator = true;} else {}break;}return foundSeparator;public ProgramNode Parse() throws Exception {ProgramNode program = new ProgramNode ();while (tokenHandler.MoreTokens()) {if (!parseFunction (programNode) && !parseAction (programNode)) {throw new ParseException ("Unexpected token: " + tokenHandler.getCurrentToken());}}return programNode;private booToken fif (tokFunproprogramNode cannot be resolved to a variable5 quick fixes available:}• Create local variable 'programNode'• Create field 'programNode'Change to 'program'Create parameter 'programNode'• Create constant 'programNode'de) {htToken();IDENTIFIER) != null) {unctionDefinitionNode (functionName Token.getValue());if (tokenHandler.MatchAndRemove (Token. TokenType. LPAREN) != null) {// Handle function parameters here if needed// You can implement this part according to your language's syntax// For simplicity, let's assume no parameters for nowif (tokenHandler. MatchAndRemove (Token. TokenType.RPAREN)!= null) {AcceptSeparators();return true;■

Answered: I got errors in parser.java. How to…

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

I got errors in parser.java. How to create methods in TokenHandler.java for getCurrentToken(), consumeToken(), getLastMatchedToken()? Please create these methods in TokenHandler.java. Fix the error for programNode that is attached. Below is TokenHandler.java

TokenHandler.java

import java.util.LinkedList;

import java.util.Optional;

import mypack.Token.TokenType;

public class TokenHandler {

private LinkedList<Token> tokens;// List of tokens

public TokenHandler(LinkedList<Token> tokens) {

this.tokens = tokens;

}

public Optional<Token> Peek(int j) {

if (j < tokens.size()) {

return Optional.of(tokens.get(j));

} else {

return Optional.empty();

}

public boolean MoreTokens() {

return !tokens.isEmpty();

}

public Optional<Token> MatchAndRemove(TokenType t) {

if (MoreTokens() && Peek(0).get().getType() == t) {

return Optional.of(tokens.remove(0)); // Remove and return a token of specified type

} else {

return Optional.empty();

}

21
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*32
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€35
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}
}
if (currentToken.getType() == Token. TokenType.NEWLINE || currentToken.getType() == Token. TokenType.
tokenHandler.consumeToken();
foundSeparator = true;
} else {
}
break;
}
return foundSeparator;
public ProgramNode Parse() throws Exception {
ProgramNode program = new ProgramNode ();
while (tokenHandler.MoreTokens()) {
if (!parseFunction (programNode) && !parseAction (programNode)) {
throw new ParseException ("Unexpected token: " + tokenHandler.getCurrentToken());
}
}
return programNode;
private boo
Token f
if (tok
Fun
pro
programNode cannot be resolved to a variable
5 quick fixes available:
}
• Create local variable 'programNode'
• Create field 'programNode'
Change to 'program'
Create parameter 'programNode'
• Create constant 'programNode'
de) {
htToken();
IDENTIFIER) != null) {
unctionDefinitionNode (functionName Token.getValue());
if (tokenHandler.MatchAndRemove (Token. TokenType. LPAREN) != null) {
// Handle function parameters here if needed
// You can implement this part according to your language's syntax
// For simplicity, let's assume no parameters for now
if (tokenHandler. MatchAndRemove (Token. TokenType.RPAREN)!= null) {
AcceptSeparators();
return true;
■

Expert Solution

Step 1: Code after errors correction

To create the methods getCurrentToken(), consumeToken(), and getLastMatchedToken() in TokenHandler.java, you can modify the class as follows:

import java.util.LinkedList;
import java.util.Optional;
import mypack.Token.TokenType;

public class TokenHandler {

private LinkedList<Token> tokens; // List of tokens
private Token currentToken;
private Token lastMatchedToken;

public TokenHandler(LinkedList<Token> tokens) {
this.tokens = tokens;
this.currentToken = null;
this.lastMatchedToken = null;
}

public Optional<Token> Peek(int j) {
if (j < tokens.size()) {
return Optional.of(tokens.get(j));
} else {
return Optional.empty();
}
}

public boolean MoreTokens() {
return !tokens.isEmpty();
}

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