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

There is a newer version: 1.2025.0

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

import java.util.StringTokenizer;
import java.util.regex.Matcher;

public class Guillemet {

	public static final Guillemet NONE = new Guillemet("", "");
	public static final Guillemet DOUBLE_COMPARATOR = new Guillemet("<<", ">>");
	public static final Guillemet GUILLEMET = new Guillemet("\u00AB", "\u00BB");

	private final String start;
	private final String end;

	public Guillemet fromDescription(String value) {
		if (value != null) {
			if ("false".equalsIgnoreCase(value)) {
				return Guillemet.DOUBLE_COMPARATOR;
			}
			if ("<< >>".equalsIgnoreCase(value)) {
				return Guillemet.DOUBLE_COMPARATOR;
			}
			if ("none".equalsIgnoreCase(value)) {
				return Guillemet.NONE;
			}
			if (value.contains(" ")) {
				final StringTokenizer st = new StringTokenizer(value, " ");
				return new Guillemet(st.nextToken(), st.nextToken());
			}
		}
		return Guillemet.GUILLEMET;
	}

	private Guillemet(String start, String end) {
		this.start = start;
		this.end = end;

	}

	public String manageGuillemet(String st) {
		if (this == DOUBLE_COMPARATOR) {
			return st;
		}
		return st.replaceAll("\\<\\<\\s?((?:\\<&\\w+\\>|[^<>])+?)\\s?\\>\\>",
				Matcher.quoteReplacement(start) + "$1" + Matcher.quoteReplacement(end));
	}

	public String manageGuillemetStrict(String st) {
		if (this == DOUBLE_COMPARATOR) {
			return st;
		}
		if (st.startsWith("<< ")) {
			st = start + st.substring(3);
		} else if (st.startsWith("<<")) {
			st = start + st.substring(2);
		}
		if (st.endsWith(" >>")) {
			st = st.substring(0, st.length() - 3) + end;
		} else if (st.endsWith(">>")) {
			st = st.substring(0, st.length() - 2) + end;
		}
		return st;
	}

}