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;
        }
    }
}




VB: Dim MText as QMemorystream
    MText.WriteLine "Given$a$text$file$of$many$lines,$where$fields$within$a$line$"
    MText.WriteLine "are$delineated$by$a$single$
    MText.WriteLine "that$aligns$each$column$of$fields$by$ensuring$that$words$in$each$"
    MText.WriteLine "column$are$separated$by$at$least$one$space."
    MText.WriteLine "Further,$allow$for$each$word$in$a$column$to$be$either$left$"
    MText.WriteLine "justified,$right$justified,$or$center$justified$within$its$column."

DefStr TextLeft, TextRight, TextCenter
DefStr MLine, LWord, Newline = chr$(13)+chr$(10)
DefInt ColWidth(100), ColCount
DefSng NrSpaces 


MText.position = 0
for x = 0 to MText.linecount -1
    MLine = MText.ReadLine
    for y = 0 to Tally(MLine, "$")
        LWord = Field$(MLine, "$", y+1)
        ColWidth(y) = iif (ColWidth(y) < len(LWord), len(LWord), ColWidth(y))
    next
next


MText.position = 0
for x = 0 to MText.linecount -1
    MLine = MText.ReadLine
    for y = 0 to Tally(MLine, "$")
        LWord = Field$(MLine, "$", y+1)
        NrSpaces = ColWidth(y) - len(LWord)
        
        TextLeft = TextLeft + LWord + Space$(NrSpaces+1)
        
        TextRight = TextRight + Space$(NrSpaces+1) + LWord
        
        TextCenter = TextCenter + Space$(floor((NrSpaces)/2)+1) + LWord + Space$(Ceil((NrSpaces)/2))
    next
    TextLeft = TextLeft + Newline 
    TextRight = TextRight + Newline 
    TextCenter = TextCenter + Newline 
next