Interpreter.java is missing these methods in the code so make sure to add them: -print, printf: Exist, marked as variadic, call Java functions -getline and next: Exist and call SplitAndAssign -gsub, match, sub, index, length, split, substr, tolower, toupper: Exist, call Java functions, correct return Below is interpreter.java import java.util.ArrayList; import java.util.HashMap; import java.util.List; public class Interpreter { private HashMap globalVariables; private HashMap functions; private class LineManager { private List lines; private int currentLineIndex; public LineManager(List inputLines) { this.lines = inputLines; this.currentLineIndex = 0; } public boolean splitAndAssign() { if (currentLineIndex < lines.size()) { String currentLine = lines.get(currentLineIndex); currentLineIndex++; // Move to the next line return true; } return false; } } public Interpreter(ProgramNode node, String path) { globalVariables = new HashMap<>(); functions = new HashMap<>(); if (path != null) { List inputLines = readAndParseFile(path); LineManager lineManager = new LineManager(inputLines); } } private List readAndParseFile(String path) { return new ArrayList<>(); } }

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

Interpreter.java is missing these methods in the code so make sure to add them:

-print, printf: Exist, marked as variadic, call Java functions

-getline and next: Exist and call SplitAndAssign

-gsub, match, sub, index, length, split, substr, tolower, toupper: Exist, call Java functions, correct return

Below is interpreter.java

import java.util.ArrayList;

import java.util.HashMap;

import java.util.List;

public class Interpreter {

private HashMap<String, InterpreterDataType> globalVariables;

private HashMap<String, FunctionDefinitionNode> functions;

private class LineManager {

private List<String> lines;

private int currentLineIndex;

public LineManager(List<String> inputLines) {

this.lines = inputLines;

this.currentLineIndex = 0;

}

public boolean splitAndAssign() {

if (currentLineIndex < lines.size()) {

String currentLine = lines.get(currentLineIndex);

currentLineIndex++; // Move to the next line

return true;

}

return false;

}

public Interpreter(ProgramNode node, String path) {

globalVariables = new HashMap<>();

functions = new HashMap<>();

if (path != null) {

List<String> inputLines = readAndParseFile(path);

LineManager lineManager = new LineManager(inputLines);

}

private List<String> readAndParseFile(String path) {

return new ArrayList<>();

}

Expert Solution

Step 1: Providing Introduction

The solution is about expanding an Interpreter class's capability in a Java program inside the context of a programming task. The solution entails incorporating a number of crucial techniques and making sure they are applied correctly. From fundamental input/output operations like print and printf to string manipulation techniques like gsub, match, and more, these methods span a broad variety of functions. The objective is to incorporate these functions into the Interpreter class in order to improve its functionality and give it the ability to understand and carry out different operations in a unique programming language.

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Follow-up Question

There are errors in lines 56 and 57. Please fix those errors and show the fixed code.

```java
if (path != null) {
// Read and parse the input file at the given path
// Create a LineManager instance with the parsed lines
List<String> inputLines = readAndParseFile(path);
LineManager lineManager = new LineManager(inputLines);
}

// Initialize global variables and functions...

// Other methods and functionality...

private List<String> readAndParseFile(String path) {
// Implement the logic to read and parse the file at the specified path
return new ArrayList<>(); // Replace with actual data
}

//print and printf methods
public void print(String message) {
System.out.print(message);
}

public void printf(String format, Object... args) {
System.out.printf(format, args);
}

// getline and next methods
public String getline() {
if (splitAndAssign()) {
return lines.get(currentLineIndex - 1);
}
return null;
}

public String next() {
return getline();
}
```

### Explanation:

1. **Reading and Parsing Files:**
- The code snippet provides a method to read and parse data from a file specified by a path.
- A `LineManager` object is then created using the parsed lines.

2. **Print Methods:**
- Implements `print(String message)` and `printf(String format, Object... args)` methods for displaying output.

3. **Getline and Next Methods:**
- Defines logic for retrieving lines from an internal list (`lines`), assuming `splitAndAssign()` processes the data correctly.

This code demonstrates basic file handling, output formatting, and string processing within a Java program.

Solution

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