Task: Align columns





Java: import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.List;

import org.apache.commons.lang3.StringUtils;


public class ColumnAligner {
    private List<String[]> words = new ArrayList<>();
    private int columns = 0;
    private List<Integer> columnWidths = new ArrayList<>();

    
    public ColumnAligner(String s) {
        String[] lines = s.split("\\n");
        for (String line : lines) {
            processInputLine(line);
        }
    }

    
    public ColumnAligner(List<String> lines) {
        for (String line : lines) {
            processInputLine(line);
        }
    }

    private void processInputLine(String line) {
        String[] lineWords = line.split("\\$");
        words.add(lineWords);
        columns = Math.max(columns, lineWords.length);
        for (int i = 0; i < lineWords.length; i++) {
            String word = lineWords[i];
            if (i >= columnWidths.size()) {
                columnWidths.add(word.length());
            } else {
                columnWidths.set(i, Math.max(columnWidths.get(i), word.length()));
            }
        }
    }

    interface AlignFunction {
        String align(String s, int length);
    }

    
    public String alignLeft() {
        return align(new AlignFunction() {
            @Override
            public String align(String s, int length) {
                return StringUtils.rightPad(s, length);
            }
        });
    }

    
    public String alignRight() {
        return align(new AlignFunction() {
            @Override
            public String align(String s, int length) {
                return StringUtils.leftPad(s, length);
            }
        });
    }

    
    public String alignCenter() {
        return align(new AlignFunction() {
            @Override
            public String align(String s, int length) {
                return StringUtils.center(s, length);
            }
        });
    }

    private String align(AlignFunction a) {
        StringBuilder result = new StringBuilder();
        for (String[] lineWords : words) {
            for (int i = 0; i < lineWords.length; i++) {
                String word = lineWords[i];
                if (i == 0) {
                    result.append("|");
                }
                result.append(a.align(word, columnWidths.get(i)) + "|");
            }
            result.append("\n");
        }
        return result.toString();
    }

    public static void main(String args[]) throws IOException {
        if (args.length < 1) {
            System.out.println("Usage: ColumnAligner file [left|right|center]");
            return;
        }
        String filePath = args[0];
        String alignment = "left";
        if (args.length >= 2) {
            alignment = args[1];
        }
        ColumnAligner ca = new ColumnAligner(Files.readAllLines(Paths.get(filePath), StandardCharsets.UTF_8));
        switch (alignment) {
        case "left":
            System.out.print(ca.alignLeft());
            break;
        case "right":
            System.out.print(ca.alignRight());
            break;
        case "center":
            System.out.print(ca.alignCenter());
            break;
        default:
            System.err.println(String.format("Error! Unknown alignment: '%s'", alignment));
            break;
        }
    }
}





COBOL:        identification division.
       program-id. AlignColumns.

       data division.
       working-storage section.
      
       78 MAX-LINES value 6.
       78 MAX-LINE-SIZE value 66.
       78 MAX-COLUMNS value 12.
       78 MAX-COLUMN-SIZE value 16.
      
       01 w-idx                   pic is 9(2).
       01 w-idy                   pic is 9(2).
       01 w-pos                   pic is 9(3).
      
       01 w-lines.
          05 w-line               pic is x(MAX-LINE-SIZE) occurs MAX-LINES.
       01 w-column-sizes.
          05 w-column-size        pic is 99 occurs MAX-COLUMNS value zeros.
       01 w-matrix.
          05 filler               occurs MAX-LINES.
             10 filler            occurs MAX-COLUMNS.
                15 w-content      pic is x(MAX-COLUMN-SIZE).
      
       01 w-line-out              pic is x(120).
      
       01 w-alignment             pic is x(1).
          88 alignment-left       value is "L".
          88 alignment-center     value is "C".
          88 alignment-right      value is "R".

       procedure division.
       main.
           move "Given$a$text$file$of$many$lines,$where$fields$within$a$line$" to w-line(1)
           move "are$delineated$by$a$single$'dollar'$character,$write$a$program" to w-line(2)
           move "that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$" to w-line(3)
           move "column$are$separated$by$at$least$one$space." to w-line(4)
           move "Further,$allow$for$each$word$in$a$column$to$be$either$left$" to w-line(5)
           move "justified,$right$justified,$or$center$justified$within$its$column." to w-line(6)
           perform calculate-size-columns
           set alignment-left to true
           perform show-content
           set alignment-center to true
           perform show-content
           set alignment-right to true
           perform show-content
           goback
           .
       calculate-size-columns.
           perform
              varying             w-idx from 1 by 1
                 until            w-idx > MAX-LINES
              unstring w-line(w-idx) delimited by "$" into w-content(w-idx, 1), w-content(w-idx, 2), 
                  w-content(w-idx, 3), w-content(w-idx, 4), w-content(w-idx, 5), w-content(w-idx, 6), 
                  w-content(w-idx, 7), w-content(w-idx, 8), w-content(w-idx, 9), w-content(w-idx, 10), 
                  w-content(w-idx, 11), w-content(w-idx, 12),
              perform
                 varying          w-idy from 1 by 1
                    until         w-idy > MAX-COLUMNS
                 if function stored-char-length(w-content(w-idx, w-idy)) > w-column-size(w-idy)
                    move function stored-char-length(w-content(w-idx, w-idy)) to w-column-size(w-idy)
                 end-if
              end-perform
           end-perform
           .
       show-content.
           move all "-" to w-line-out
           display w-line-out
           perform
              varying             w-idx from 1 by 1
                 until            w-idx > MAX-LINES
              move spaces to w-line-out
              move 1 to w-pos
              perform
                 varying          w-idy from 1 by 1
                    until         w-idy > MAX-COLUMNS
                 call "C$JUSTIFY" using w-content(w-idx, w-idy)(1:w-column-size(w-idy)), w-alignment
                 move w-content(w-idx, w-idy) to w-line-out(w-pos:w-column-size(w-idy))
                 compute w-pos = w-pos + w-column-size(w-idy) + 1
              end-perform
              display w-line-out
           end-perform
           .