LineCounter

package sk.upjs.ics.agilnaRuka;

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

public class LineCounter {

    List<String> readFile(String filepath) {
        List<String> fileLines = new ArrayList<>();
        BufferedReader bufferedReader;
        String currentLine;
        try {
            bufferedReader = new BufferedReader(new FileReader(filepath));
            while ((currentLine = bufferedReader.readLine()) != null) {
                fileLines.add(currentLine);
            }
            bufferedReader.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

        return fileLines;
    }

    List<String> trimEachLine(List<String> lines) {
        List<String> linesCopy = new ArrayList<>(lines);
        List<String> trimmedLines = new ArrayList<>();

        for (String line : linesCopy) {
            trimmedLines.add(line.trim());
        }

        return trimmedLines;
    }

    List<String> removeEachComment(List<String> trimmedLines) {
        List<String> removedWholeLineComments = removeWholeLineComments(trimmedLines);
        return removePartialLineComments(removedWholeLineComments);
    }

    boolean isWholeLineComment(String line) {
        return (line != null && line.length() >= 2 && line.startsWith("//"));
    }

    List<String> removeWholeLineComments(List<String> trimmedLines) {
        List<String> linesCopy = new ArrayList<>(trimmedLines);

        for (String line : linesCopy) {
            if (isWholeLineComment(line)) {
                linesCopy.set(linesCopy.indexOf(line), "");
            }
        }

        return linesCopy;
    }

    List<String> removePartialLineComments(List<String> trimmedLines) {
        List<String> linesCopy = new ArrayList<>(trimmedLines);
        boolean isComment = false;
        boolean isInString = false;

        for (String line : linesCopy) {
            StringBuilder temp = new StringBuilder("");

            for (int j = 0; j < line.length(); j++) {

                if (isComment == false) {
                    isInString = isPartOfString(isInString, line, j);
                }

                if (isInString) {
                    temp.append(line.charAt(j));
                } else {

                    isComment = isPartOfComment(isComment, line, j);

                    if (isComment == false) {
                        temp.append(line.charAt(j));
                    }

                    isComment = isNextStillComment(isComment, line, j);

                }
            }
            linesCopy.set(linesCopy.indexOf(line), temp.toString());
        }

        return linesCopy;
    }

    boolean isPartOfString(boolean isInString, String line, int j) {

        if (isInString == false) {
            if (line.charAt(j) == '"') {
                isInString = true;
            }
            return isInString;
        } else {
            if (j - 1 >= 0 && line.charAt(j - 1) != '\\' && line.charAt(j) == '"') { // string " \" "
                isInString = false;
            }
            return isInString;
        }
    }

    private boolean isNextStillComment(boolean isComment, String line, int j) { // citatelne? pomocne premenne? vnorene
                                                                                // ify?
        if (isComment == true && j - 1 >= 0 && line.charAt(j - 1) == '*' && line.charAt(j) == '/') {
            isComment = false;
        }

        return isComment;
    }

    boolean isPartOfComment(boolean isComment, String line, int j) {
        if (isComment == false && j + 1 < line.length() && line.charAt(j) == '/' && line.charAt(j + 1) == '*') {
            return true;
        }

        return isComment;
    }

    int countLinesOfCode(String filepath) {
        int numberOfLinesWithoutComment = 0;
        List<String> fileLines = readFile("App.java");
        List<String> trimFileLines = trimEachLine(fileLines);
        List<String> withoutComments = removeEachComment(trimFileLines);

        for (String string : withoutComments) {
            if (!string.isEmpty()) {
                numberOfLinesWithoutComment++;
            }
        }

        return numberOfLinesWithoutComment;
    }

}