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PlantUML is a component that allows to quickly write diagrams from text.

There is a newer version: 1.2024.8

// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
package net.sourceforge.plantuml.posimo;

import java.util.Collection;
import java.util.Objects;

import net.sourceforge.plantuml.klimt.geom.XDimension2D;
import net.sourceforge.plantuml.utils.Log;

public class DotxMaker {

	private final Cluster root;
	private final Collection paths;

	public DotxMaker(Cluster root, Collection paths) {
		this.root = root;
		this.paths = paths;
	}

	public String createDotString(String... dotStrings) {
		final StringBuilder sb = new StringBuilder();
		sb.append("digraph unix {");

		for (String s : dotStrings) {
			sb.append(s);
		}

		sb.append("compound=true;");

		printCluster(sb, root);

		for (Path p : paths) {
			sb.append(getPathString(p) + ";");
		}

		sb.append("}");

		return sb.toString();
	}

	private void printCluster(StringBuilder sb, Cluster cl) {
		if (cl.getContents().size() == 0 && cl.getSubClusters().size() == 0) {
			throw new IllegalStateException(cl.toString());
		}
		for (Cluster sub : cl.getSubClusters()) {
			sb.append("subgraph cluster" + sub.getUid() + " {");
			if (sub.getTitleWidth() > 0 && sub.getTitleHeight() > 0) {
				sb.append("label=<>");
			}

			printCluster(sb, sub);
			sb.append("}");

		}
		for (Block b : cl.getContents()) {
			sb.append("b" + b.getUid() + getNodeAttibute(b) + ";");
		}

	}

	private String getPathString(Path p) {
		Objects.requireNonNull(p);
		final StringBuilder sb = new StringBuilder("b" + p.getStart().getUid() + " -> b" + p.getEnd().getUid());
		sb.append(" [dir=none, arrowhead=none, headclip=true, tailclip=true");
		final int len = p.getLength();
		if (len >= 3) {
			sb.append(",minlen=" + (len - 1));
		}
		if (p.getLabel() == null) {
			sb.append("]");
		} else {
			final XDimension2D size = p.getLabel().getSize();
			sb.append(", label=<>]");
		}

		if (p.getLength() <= 1) {
			final boolean samePackage = p.getStart().getParent() == p.getEnd().getParent();
			if (samePackage) {
				sb.append("{rank=same; b" + p.getStart().getUid() + "; b" + p.getEnd().getUid() + "}");
			} else {
				Log.println("!!!!!!!!!!!!!!!!!TURNING ARROUND DOT BUG!!!!!!!!!!!!!!!!!!");
			}
		}

		return sb.toString();
	}

	private String getNodeAttibute(Block b) {
		final StringBuilder sb = new StringBuilder("[");
		sb.append("label=\"\",");
		sb.append("fixedsize=true,");
		sb.append("width=" + b.getSize().getWidth() / 72.0 + ",");
		sb.append("height=" + b.getSize().getHeight() / 72.0 + ",");
		sb.append("shape=rect");
		sb.append("]");
		return sb.toString();
	}

}