CommandCreoleExposantChange.java

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 * PlantUML : a free UML diagram generator
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package net.sourceforge.plantuml.klimt.creole.command;

import java.util.List;

import com.plantuml.ubrex.UMatcher;
import com.plantuml.ubrex.UnicodeBracketedExpression;

import net.sourceforge.plantuml.klimt.creole.legacy.StripeSimple;
import net.sourceforge.plantuml.klimt.font.FontConfiguration;
import net.sourceforge.plantuml.klimt.font.FontPosition;

public class CommandCreoleExposantChange implements Command {

	private final FontPosition position;
	private final UnicodeBracketedExpression ubrex;

	@Override
	public String startingChars() {
		return "<";
	}

	private CommandCreoleExposantChange(String ubrexString, FontPosition position) {
		this.position = position;
		this.ubrex = UnicodeBracketedExpression.build(ubrexString);
	}

	public static Command create(FontPosition position) {
		final String htmlTag = position.getHtmlTag();
		final String ubrexString = "<" + htmlTag + ">〶$V=〄>〘</" + htmlTag + ">〙";
		return new CommandCreoleExposantChange(ubrexString, position);
	}

	public int matchingSize(String line) {
		final UMatcher matcher = ubrex.match(line);
		final List<String> value = matcher.getCapture("V");
		if (value.size() == 0)
			return 0;
		return value.get(0).length();
	}

	public String executeAndGetRemaining(String line, StripeSimple stripe) {

		final UMatcher matcher = ubrex.match(line);
		final List<String> value = matcher.getCapture("V");
		final String accepted = matcher.getAcceptedMatch();

		if (value.size() == 0)
			throw new IllegalStateException();

		final FontConfiguration fc1 = stripe.getActualFontConfiguration();
		final FontConfiguration fc2 = fc1.changeFontPosition(position);

		stripe.setActualFontConfiguration(fc2);
		stripe.analyzeAndAdd(value.get(0));
		stripe.setActualFontConfiguration(fc1);
		return line.substring(accepted.length());
	}

}