TxtParser.java

package tppitweaks.util;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.Scanner;

import tppitweaks.TPPITweaks;

/**
 * Beware all ye who enter here, for the sake of your sanity, turn back
 */
public class TxtParser
{
    /** The useable lines (not commented) from the file last processed by parseFileMain **/
    private static ArrayList<String> useableLines = new ArrayList<String>();

    /**
     * Parses a file, taking into account all comments, line-skips, and pagination/formatting
     * 
     * @param file
     * @return an array of pages
     */
    public static ArrayList<String> parseFileMain(InputStream file)
    {
        ArrayList<String> bookText = new ArrayList<String>();
        useableLines.clear();

        if (file == null)
            return new ArrayList<String>();

        Scanner scanner;
        scanner = new Scanner(file);

        String nextPage = "";

        while (scanner.hasNextLine())
        {
            String temp = scanner.nextLine();

            // If the line is a comment
            if (temp.length() == 0 || temp.startsWith("**"))
            {
                // If the line is possibly a line-skip comment
                if (temp.startsWith("***"))
                {
                    boolean validSkip = true;
                    for (int i = 3; i < temp.length(); i++)
                        if (!isANumber(temp.charAt(i)))
                        {
                            validSkip = false;
                            break;
                        }
                    // Skip the requested amount of lines by parsing the number
                    // after the asterisks
                    if (validSkip)
                    {
                        for (int i = 0; i <= Integer.parseInt(temp.substring(3, temp.length())); i++)
                        {
                            scanner.nextLine();
                        }
                    }
                    else
                        TPPITweaks.logger.warn("Invalid line-skip in changelog. This may not work as intended");
                }
                // Finally, do not add this to the page
                continue;
            }

            // If this line is a page break
            if (temp.equals("~~~"))
            {
                bookText.add(nextPage);
                nextPage = "";
            }
            else
            {
                useableLines.add(temp);

                // If there is a line break
                if (temp.charAt(temp.length() - 1) == '~')
                {
                    temp = temp.substring(0, temp.length() - 1);
                    temp += "\n";
                    if (nextPage.length() + temp.length() > 240 && nextPage.length() != 0 && temp.length() != 0)
                    {
                        bookText.add(nextPage);
                        nextPage = temp;
                        temp = "";
                    }
                    else
                        nextPage += temp;
                }
                // In the end just concatenate to the page
                else
                {
                    if (nextPage.length() + temp.length() > 240 && nextPage.length() != 0 && temp.length() != 0)
                    {
                        bookText.add(nextPage);
                        nextPage = temp;
                        temp = "";
                    }
                    else
                        nextPage += temp + " ";
                }
            }
        }

        if (nextPage.length() > 1)
            bookText.add(nextPage);

        scanner.close();

        return bookText;
    }

    /**
     * @param charAt
     * @return If this char is a number
     */
    private static boolean isANumber(char charAt)
    {
        for (int i = 0; i < 10; i++)
        {
            try
            {
                if (Integer.parseInt(String.valueOf(charAt)) == i)
                    return true;
            }
            catch (Exception e)
            {
                // Do Nothing
            }
        }
        return false;
    }

    /**
     * Parses a file, identically to ParseFileMain, but takes into account mod names, searching for the >< identifier.
     * 
     * @param file
     * @param modName
     * @return an array of pages, only containing the lines of info about the passed in modname
     */
    public static ArrayList<String> parseFileMods(InputStream file, String modName)
    {
        ArrayList<String> bookText = new ArrayList<String>();

        Scanner scanner = new Scanner(file);

        String nextPage = "";

        while (scanner.hasNextLine())
        {
            String temp = scanner.nextLine();
            if (temp.startsWith(">") && temp.contains("<"))
            {
                String test = temp.substring(1, temp.length() - 1);
                if (test.contains(modName))
                    break;
            }
        }

        while (scanner.hasNextLine())
        {
            String temp = scanner.nextLine();
            if (temp.startsWith(">") && temp.contains("<"))
                break;

            // If the line is a comment
            if (temp.length() == 0 || temp.startsWith("**"))
            {
                // If the line is possibly a line-skip comment
                if (temp.startsWith("***"))
                {
                    boolean validSkip = true;
                    for (int i = 3; i < temp.length(); i++)
                        if (!isANumber(temp.charAt(i)))
                        {
                            validSkip = false;
                            break;
                        }
                    // Skip the requested amount of lines by parsing the number
                    // after the asterisks
                    if (validSkip)
                    {
                        for (int i = 0; i <= Integer.parseInt(temp.substring(3, temp.length())); i++)
                        {
                            scanner.nextLine();
                        }
                    }
                    else
                        TPPITweaks.logger.warn("Invalid line-skip in changelog. This may not work as intended");
                }

                // Finally, do not add this to the page
                continue;
            }

            // If this line is a page break
            if (temp.equals("~~~"))
            {
                bookText.add(nextPage);
                nextPage = "";
            }
            else
            {
                // If there is a line break
                if (temp.charAt(temp.length() - 1) == '~')
                {
                    temp = temp.substring(0, temp.length() - 1);
                    temp += "\n";
                    if (nextPage.length() + temp.length() > 240 && nextPage.length() != 0 && temp.length() != 0)
                    {
                        bookText.add(nextPage);
                        nextPage = temp;
                        temp = "";
                    }
                    else
                        nextPage += temp;
                }
                // In the end just concatenate to the page
                else
                {
                    if (nextPage.length() + temp.length() > 240 && nextPage.length() != 0 && temp.length() != 0)
                    {
                        bookText.add(nextPage);
                        nextPage = temp;
                        temp = "";
                    }
                    else
                        nextPage += temp + " ";
                }
            }
        }

        if (nextPage.length() > 1)
            bookText.add(nextPage);

        scanner.close();

        return bookText;
    }
}