Java Programming: Below is the ProgramNode extends Node.java file. There are errors in the code so please fix those errors. There must be no errors at all. Attached is the rubric that is circled in black all the components the ProgramNode extends Node.java file must have. public class ProgramNode extends Node { private Map<String, FunctionNode> functions; public ProgramNode(Map<String, FunctionNode> functions) { this.functions = functions; } public Map<String, FunctionNode> getFunctions() { return functions; } public void setFunctions(Map<String, FunctionNode> functions) { this.functions = functions; } public String toString() { return "ProgramNode [functions=" + functions + "]"; } public FunctionNode function() { if(checkToken("define")) { nextToken(); String name = getToken(TokenType.IDENTIFIER); nextToken(); if(checkToken("(")) { nextToken(); List<VariableNode> parameters = parameterDeclarations(); if(checkToken(")")) { nextToken(); if(checkToken(TokenType.END_OF_LINE)) { nextToken(); List<VariableNode> constants = constantDeclarations(); List<VariableNode> variables = variableDeclarations(); if(checkToken(TokenType.INDENT)) { nextToken(); List<StatementNode> statements = new ArrayList<StatementNode>(); while(true) { StatementNode statement = expression(); if(statement == null) { break; } else { statements.add(statement); } } if(checkToken(TokenType.DEDENT)) { nextToken(); return new FunctionNode(name, parameters, constants, variables, statements); } } } } } } return null; } public List<VariableNode> parameterDeclarations() { List<VariableNode> parameters = new ArrayList<VariableNode>(); while(true) { if(checkToken("var")) { nextToken(); boolean changeable = true; } else { boolean changeable = false; } String name = getToken(TokenType.IDENTIFIER); nextToken(); Node type = factor(); if(type == null) { break; } VariableNode variable = new VariableNode(name, changeable, type); parameters.add(variable); if(checkToken(",")) { nextToken(); } else { break; } } return parameters; } public List<VariableNode> constantDeclarations() { List<VariableNode> constants = new ArrayList<VariableNode>(); while(true) { if(checkToken("const")) { nextToken(); } String name = getToken(TokenType.IDENTIFIER); nextToken(); Node type = factor(); if(type == null) { break; } VariableNode constant = new VariableNode(name, false, type); constants.add(constant); if(checkToken(",")) { nextToken(); } else { break; } } return constants; } public List<VariableNode> variableDeclarations() { List<VariableNode> variables = new ArrayList<VariableNode>(); while(true) { if(checkToken("var")) { nextToken(); } String name = getToken(TokenType.IDENTIFIER); nextToken(); Node type = factor(); if(type == null) { break; } VariableNode variable = new VariableNode(name, true, type); variables.add(variable); if(checkToken(",")) { nextToken(); } else { break; } } return variables; } public ProgramNode parse() { Map<String, FunctionNode> functions = new HashMap<String, FunctionNode>(); while(t.

1. Java Programming: Below is the ProgramNode extends Node.java file. There are errors in the
code so please fix those errors. There must be no errors at all. Attached is the rubric that is
circled in black all the components the ProgramNode extends Node.java file must have.
public class ProgramNode extends Node {
private Map<String, FunctionNode> functions;
public ProgramNode(Map<String, FunctionNode> functions) {
this.functions = functions;
}
public Map<String, FunctionNode> getFunctions() {
return functions;
}
public void setFunctions(Map<String, FunctionNode> functions) {
this.functions = functions;
}
public String toString() {
return "ProgramNode [functions=" + functions + "]";
}
public FunctionNode function() {
if(checkToken("define")) {
nextToken();
String name = getToken(TokenType.IDENTIFIER);
nextToken();
if(checkToken("(")) {
nextToken();

2. List<VariableNode> parameters = parameterDeclarations();
if(checkToken(")")) {
nextToken();
if(checkToken(TokenType.END_OF_LINE)) {
nextToken();
List<VariableNode> constants = constantDeclarations();
List<VariableNode> variables = variableDeclarations();
if(checkToken(TokenType.INDENT)) {
nextToken();
List<StatementNode> statements = new ArrayList<StatementNode>();
while(true) {
StatementNode statement = expression();
if(statement == null) {
break;
} else {
statements.add(statement);
}
}
if(checkToken(TokenType.DEDENT)) {
nextToken();
return new FunctionNode(name, parameters, constants, variables, statements);
}
}

3. }
}
}
}
return null;
}
public List<VariableNode> parameterDeclarations() {
List<VariableNode> parameters = new ArrayList<VariableNode>();
while(true) {
if(checkToken("var")) {
nextToken();
boolean changeable = true;
} else {
boolean changeable = false;
}
String name = getToken(TokenType.IDENTIFIER);
nextToken();
Node type = factor();
if(type == null) {
break;
}
VariableNode variable = new VariableNode(name, changeable, type);
parameters.add(variable);

4. if(checkToken(",")) {
nextToken();
} else {
break;
}
}
return parameters;
}
public List<VariableNode> constantDeclarations() {
List<VariableNode> constants = new ArrayList<VariableNode>();
while(true) {
if(checkToken("const")) {
nextToken();
}
String name = getToken(TokenType.IDENTIFIER);
nextToken();
Node type = factor();
if(type == null) {
break;
}
VariableNode constant = new VariableNode(name, false, type);
constants.add(constant);
if(checkToken(",")) {

5. nextToken();
} else {
break;
}
}
return constants;
}
public List<VariableNode> variableDeclarations() {
List<VariableNode> variables = new ArrayList<VariableNode>();
while(true) {
if(checkToken("var")) {
nextToken();
}
String name = getToken(TokenType.IDENTIFIER);
nextToken();
Node type = factor();
if(type == null) {
break;
}
VariableNode variable = new VariableNode(name, true, type);
variables.add(variable);
if(checkToken(",")) {
nextToken();

6. } else {
break;
}
}
return variables;
}
public ProgramNode parse() {
Map<String, FunctionNode> functions = new HashMap<String, FunctionNode>();
while(true) {
FunctionNode function = function();
if(function == null) {
break;
} else {
functions.put(function.getName(), function);
}
}
return new ProgramNode(functions);
}
public static void main(String[] args) {
ProgramNode program = parse();
for(FunctionNode function : program.getFunctions().values()) {
System.out.println(function);
}

7. }
}