Below is interpreter.java & there's errors in the code, so make sure to fix those errors with the information of what the code must have. Attached is images of the code with errors. Interpreter.java import java.util.*;
Below is interpreter.java & there's errors in the code, so make sure to fix those errors with the information of what the code must have. Attached is images of the code with errors. Interpreter.java import java.util.*;
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
Related questions
Question
Below is interpreter.java & there's errors in the code, so make sure to fix those errors with the information of what the code must have. Attached is images of the code with errors.
Interpreter.java
import java.util.*;
public class Interpreter {
privateHashMap<String, Object> variables;
publicvoidinterpretFunction(FunctionNode fn){
variables = new HashMap<String, Object>();
for(Node constantNode : fn.getConstants()){
Object constant = constantNode.getValue();
variables.put(constantNode.getName(), constant);
}
for(Node localVarNode : fn.getVariables()){
Object localVar =null;
variables.put(localVarNode.getName(), localVar);
}
interpretBlock(fn.getStatements(), variables);
}
publicvoidinterpretBlock(List<StatementNode> statementNodes,HashMap<String, Object> variables){
for(StatementNode statement : statementNodes){
if(statement instanceofIfNode){
interpretIfNode((IfNode) statement, variables);
}elseif(statement instanceofVariableReferenceNode){
interpretVariableReferenceNode((VariableReferenceNode) statement, variables);
}elseif(statement instanceofMathOpNode){
interpretMathOpNode((MathOpNode) statement, variables);
}elseif(statement instanceofBooleanCompareNode){
interpretBooleanCompareNode((BooleanCompareNode) statement, variables);
}elseif(statement instanceofForNode){
interpretForNode((ForNode) statement, variables);
}elseif(statement instanceofRepeatNode){
interpretRepeatNode((RepeatNode) statement, variables);
}elseif(statement instanceofConstantNode){
interpretConstantNode((ConstantNode) statement, variables);
}elseif(statement instanceofWhileNode){
interpretWhileNode((WhileNode) statement, variables);
}elseif(statement instanceofAssignmentNode){
interpretAssignmentNode((AssignmentNode) statement, variables);
}elseif(statement instanceofFunctionCallNode){
interpretFunctionCallNode((FunctionCallNode) statement, variables);
}
}
}
publicvoidinterpretIfNode(IfNode ifNode,HashMap<String, Object> variables){
Object result =expression(ifNode.getBooleanCompare(), variables);
if(result !=null&&(result instanceofBoolean&&(Boolean) result)){
interpretBlock(ifNode.getStatements(), variables);
}elseif(ifNode.getNextIfNode()!=null){
interpretIfNode(ifNode.getNextIfNode(), variables);
}
}
publicObjectinterpretVariableReferenceNode(VariableReferenceNode varRefNode,HashMap<String, Object> variables){
String name = varRefNode.getName();
if(variables.containsKey(name)){
return variables.get(name);
}else{
thrownewRuntimeException("Variable '"+ name +"' does not exist.");
}
}
publicObjectinterpretMathOpNode(MathOpNode mathOpNode,HashMap<String, Object> variables){
Object leftNode =expression(mathOpNode.getLeft(), variables);
Object rightNode =expression(mathOpNode.getRight(), variables);
if(!(leftNode instanceofDouble)||!(rightNode instanceofDouble)){
thrownewRuntimeException("Cannot add/subtract/multiply/divide/modulo "+ leftNode +" and "+ rightNode);
}
Double left =(Double) leftNode;
Double right =(Double) rightNode;
Object result =null;
switch(mathOpNode.getOp()){
case"+":
result = left + right;
break;
case"-":
result = left - right;
break;
case"*":
result = left * right;
break;
case"/":
result = left / right;
break;
case"%":
result = left % right;
break;
default:
thrownewRuntimeException();
}
}
}
|
Comments |
None/Excessive (0) |
“What” not “Why”, few (5) |
Some “what” comments or missing some (7) |
Anything not obvious has reasoning (10) |
|
Variable/Function naming |
Single letters everywhere (0) |
Lots of abbreviations (5) |
Full words most of the time (8) |
Full words, descriptive (10) |
|
interpretFunction |
Not handled(0) |
|
|
Creates variables and calls interpretBlock (10) |
|
interpretBlock |
Not handled(0) |
|
|
Loops over the statement nodes and calls methods for each (5) |
|
expression |
Not handled(0) |
|
|
Handles mathOpNode, constantNodes, variable references (10) |
|
booleanCompare |
Not handled(0) |
|
|
Calls expression(), then compares (5) |
|
variableReferenceNode |
Not handled(0) |
|
|
Looks up nodes and returns IDT (5) |
|
mathOpNode |
Not handled(0) |
|
|
Calls expression(), then calculates (5) |
|
ifNode |
Not handled(0) |
|
|
Calls booleanCompare and chains (10) |
|
forNode |
Not handled(0) |
|
|
Loops over the range and calls interpretBlock(10) |
|
repeatNode |
Not handled(0) |
|
|
Calls booleanCompare and interpretBlock correctly (5) |
|
constantNodes |
Not handled(0) |
|
|
Returns a new IDT (5) |
|
whileNode |
Not handled(0) |
|
|
Calls booleanCompare and interpretBlock correctly (5) |
|
assignmentNode |
Not handled(0) |
|
|
calls expression() and replaces the IDT entry for the variable(5) |
Transcribed Image Text:1010 public Object interpretMathOpNode (MathOpNode mathOpNode, HashMap<String, Object> variables) {
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}
Object leftNode = expression (mathOpNode.getLeft(), variables);
Object rightNode = expression (mathOpNode.getRight(), variables);
if(!(leftNode instanceof Double) || (rightNode instanceof Double)) {
throw new RuntimeException("Cannot add/subtract/multiply/divide/modulo " + leftNode + " and " + ri
}
Double left = (Double) leftNode;
Double right = (Double) rightNode;
Object result = null;
switch (mathOpNode.getOp()) {
case "+":
result left + right;
break;
"_".
case -
result left right;
break;
**".
case www.
result left* right;
break;
case "/":
result left/right;
break;
case "%":
result left % right;
break;
default:
throw new Runtime Exception ("Unrecognized arithmetic operation");
Transcribed Image Text:320
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public void
interpretBlock(List<StatementNode> statementNodes, HashMap<String, Object> variables) {
for (StatementNode statement : statementNodes) {
if(statement instanceof IfNode) {
59
}
interpretIfNode ((IfNode) statement, variables);
} else if (statement instanceof VariableReferenceNode) {
}
interpretVariableReferenceNode ((VariableReferenceNode) statement, variables);
} else if(statement instanceof MathOpNode) {
interpretMathOpNode ( (MathOpNode) statement, variables);
} else if (statement instanceof BooleanCompareNode) {
interpretBooleanCompareNode((BooleanCompareNode) statement, variables);
else if (statement instanceof ForNode) {
interpretForNode((ForNode) statement, variables);
} else if (statement instanceof RepeatNode) {
interpretRepeatNode ((RepeatNode) statement, variables);
}
} else if(statement instanceof ConstantNode) {
interpretConstantNode((ConstantNode) statement, variables);
} else if (statement instanceof WhileNode) {
interpretWhileNode((WhileNode) statement, variables);
} else if(statement instanceof AssignmentNode) {
interpretAssignmentNode ((AssignmentNode) statement, variables);
} else if (statement instanceof FunctionCallNode) {
interpretFunctionCallNode((FunctionCallNode)
580 private void interpretFunctionCallNode (FunctionCallNode statement, HashMap<String, Object> variables2) {
// TODO Auto-generated method stub
statement, variables);
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