Java Program: There are errors in the lexer and shank file. Please fix those errors and there must be no error in any of the code at all. Below is the lexer, shank, and token files. The shank file is the main method. There is a rubric attached as well.

Lexer.java

import java.util.ArrayList; import java.util.HashMap; import java.util.List;

import mypack.Token.TokenType;

public class Lexer {

private static final int INTEGER_STATE = 1; private static final int DECIMAL_STATE = 2; private static final int IDENTIFIER_STATE = 3; private static final int SYMBOL_STATE = 4; private static final int ERROR_STATE = 5; private static final int STRING_STATE = 6; private static final int CHAR_STATE = 7; private static final int COMMENT_STATE = 8;

private static final char EOF = (char) -1;

private static String input; private static int index; private static char currentChar; private static int lineNumber = 1; private static int indentLevel = 0; private static int lastIndentLevel = 0;

private static HashMap keywords = new HashMap() {{ put("while", TokenType.WHILE); put("if", TokenType.IF); put("else", TokenType.ELSE); put("print", TokenType.PRINT); }};

private static HashMap symbols = new HashMap() {{ put('+', TokenType.PLUS); put('-', TokenType.MINUS); put('*', TokenType.MULTIPLY); put('/', TokenType.DIVIDE); put('=', TokenType.EQUALS); put(':', TokenType.COLON); put(';', TokenType.SEMICOLON); put('(', TokenType.LEFT_PAREN); put(')', TokenType.RIGHT_PAREN); put('{', TokenType.LEFT_BRACE); put('}', TokenType.RIGHT_BRACE); put('', TokenType.GREATER_THAN); }};

public Lexer(String input) { Lexer.input = input; index = 0; currentChar = input.charAt(index); }

private void nextChar() { index++; if (index >= input.length()) { currentChar = EOF; } else { currentChar = input.charAt(index); } }

private void skipWhiteSpace() { while (Character.isWhitespace(currentChar)) { nextChar(); } }

private int getIndentLevel() { int level = 0; int i = index; char c = input.charAt(i); while (c == ' ' || c == '\t') { if (c == '\t') { level += 1; } else if (c == ' ') { level += 1; } i++; if (i >= input.length()) { break; }

Shank.java

package mypack;

import java.io.IOException; import java.nio.file.Files; import java.nio.file.Paths; import java.util.List;

public class Shank { public static void main(String[] args) { if (args.length != 1) { System.out.println("Error: Exactly one argument is required."); System.exit(0); }

String filename = args[0];

try { List lines = Files.readAllLines(Paths.get(filename));

for (String line : lines) { try { Lexer lexer = new Lexer(line); List tokens = lexer.lex(line);

for (Token token : tokens) { System.out.println(token); } } catch (Exception e) { System.out.println("Exception: " + e.getMessage()); } } } catch (IOException e) { System.out.println("Error: Could not read file '" + filename + "'."); } } }

Token.java

package mypack;

public class Token { public enum TokenType { WORD, NUMBER, SYMBOL }

public TokenType tokenType; private String value; public Token(TokenType type, String val) { this.tokenType = type; this.value = val; } public TokenType getTokenType() { return this.tokenType; }

public String toString() { return this.tokenType + ": " + this.value; } }