My scanner class detects an extra character?

[bananacat]

Hi. I'm using 3 classes: the Character class, the Scanner class, and the Test class.

This is the Character class:

public class Character {
    private char cargo = '\u0007'; 
    private String sourceText = ""; 
    private int sourceIndex = 0; 
    private int lineIndex = 0;
    private int columnIndex = 0;

    public Character(String sourceText, char cargo, int sourceIndex, int lineIndex, int columnIndex) {
        this.sourceText = sourceText;
        this.cargo = cargo;
        this.sourceIndex = sourceIndex;
        this.lineIndex = lineIndex;
        this.columnIndex = columnIndex;
    }

    /*****************************************************************************************/
    /* Returns the String representation of the Character object                      */
    /*****************************************************************************************/
    @Override
    public String toString() {
        switch (cargo) {
            case ' ': return String.format("%6d %-6d " + "    blank", lineIndex, columnIndex);
            case '\t': return String.format("%6d %-6d " + "    tab", lineIndex, columnIndex);
            case '\n': return String.format("%6d %-6d " + "    newline", lineIndex, columnIndex);
            default: return String.format("%6d %-6d " + cargo, lineIndex, columnIndex);
        }
    }
}

This is the Scanner class:

public class Scanner {
    private String sourceText = ""; 
    private int sourceIndex = -1; 
    private int lineIndex = 0;
    private int columnIndex = -1;
    private int lastIndex = 0;

    /*****************************************************************************************/
    /* Assign proper values                                                                  */
    /*****************************************************************************************/ 
    public Scanner(String sourceText) {
        this.sourceText = sourceText;
        lastIndex = sourceText.length() - 1;
    }

    /*****************************************************************************************/
    /* Returns the next character in the source text                                         */
    /*****************************************************************************************/   
    public Character getNextCharacter() {
        if (sourceIndex > 0 && sourceText.charAt(sourceIndex - 1) == '\n') {
            ++lineIndex;
            columnIndex = -1;
        }
        ++sourceIndex;
        ++columnIndex;

        char currentChar = sourceText.charAt(sourceIndex);
        Character objCharacter = new Character(sourceText, currentChar, sourceIndex, lineIndex, columnIndex);

        return objCharacter;
    }
}

And this is the Test class's main method:

public static void main(String[] args) 
{
    String sourceText = "";
    String filePath = "D:\\Somepath\\SampleCode.dat";
    try { sourceText = readFile(filePath, StandardCharsets.UTF_8); }
    catch (IOException io) { System.out.println(io.toString()); }
    LexicalAnalyzer.Scanner sca = new LexicalAnalyzer.Scanner(sourceText);
    LexicalAnalyzer.Character cha;
    int i =0;
    while(i < sourceText.length()) 
    {
        cha = sca.getNextCharacter();
        System.out.println(cha.toString());
        i++;
    }
}

Basically, what I'm trying to do is print each character in my source file, along with its other character details such as line number and column number. Also, please note my switch statements in the toString() method of the Character class.

Let's say, for example, my file contains the text:

This is line #1.
This is line #2.

From my code, I'm expecting to get:

     0 0      T
     0 1      h
     0 2      i
     0 3      s
     0 4          blank
     0 5      i
     0 6      s
     0 7          blank
     0 8      l
     0 9      i
     0 10     n
     0 11     e
     0 12         blank
     0 13     #
     0 14     1
     0 15     .
     0 16         newline
     1 0      T
     1 1      h
     1 1      i
     1 2      s
     1 3          blank
     1 4      i
     1 5      s
     1 6          blank
     1 7      l
     1 8      i
     1 9      n
     1 10     e
     1 11         blank
     1 12     #
     1 13     2
     1 14     .

However, I'm getting:

     0 0      T
     0 1      h
     0 2      i
     0 3      s
     0 4          blank
     0 5      i
     0 6      s
     0 7          blank
     0 8      l
     0 9      i
     0 10     n
     0 11     e
     0 12         blank
     0 13     #
     0 14     1
     0 15     .
     0 16     
     0 17         newline
     0 18     T
     1 0      h
     1 1      i
     1 2      s
     1 3          blank
     1 4      i
     1 5      s
     1 6          blank
     1 7      l
     1 8      i
     1 9      n
     1 10     e
     1 11         blank
     1 12     #
     1 13     2
     1 14     .

Notice what it prints when there'a newline character. Space and tab characters work fine. I get what I want, but not for newline. BTW, this is just a Java code of this: http://parsingintro.sourceforge.net/#contents_item_4.2.

Please don't attack me. I've been trying to find out the reason behind this for hours and hours.

[bananacat]

Wrong section. :/ Somebody help me move this thread.

[rproffitt]

First thought. The old CRLF discussion.
http://stackoverflow.com/questions/1761051/difference-between-n-and-r

I can't tell how you created the text file or on what OS.
HTH.