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/* ========================================================================
 * PlantUML : a free UML diagram generator
 * ========================================================================
 *
 * (C) Copyright 2009-2024, Arnaud Roques
 *
 * Project Info:  https://plantuml.com
 *
 * If you like this project or if you find it useful, you can support us at:
 *
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 * This file is part of PlantUML.
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 * PlantUML is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by
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 *
 * PlantUML distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
 * License for more details.
 *
 * You should have received a copy of the GNU General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301,
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 * Original Author:  Arnaud Roques
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 */
package net.sourceforge.plantuml.tim;

import net.sourceforge.plantuml.text.StringLocated;
import net.sourceforge.plantuml.tim.expression.TValue;

public class EaterAffectation extends Eater {

	public EaterAffectation(StringLocated sl) {
		super(sl.getTrimmed());
	}

	@Override
	public void analyze(TContext context, TMemory memory) throws EaterException, EaterExceptionLocated {
		skipSpaces();
		checkAndEatChar("!");
		skipSpaces();
		String varname = eatAndGetVarname();
		TVariableScope scope = TVariableScope.lazzyParse(varname);
		if (scope != null) {
			skipSpaces();
			if (peekChar() == '?' || peekChar() == '=') {
				// The variable itself is "local" or "glocal", which is not a good idea by the way
				scope = null;
			} else
				varname = eatAndGetVarname();
		}
		skipSpaces();
		boolean conditional = false;
		if (peekChar() == '?') {
			checkAndEatChar('?');
			conditional = true;
		}
		checkAndEatChar('=');
		if (conditional)
			if (memory.getVariable(varname) != null)
				return;

		skipSpaces();
		final TValue value = eatExpression(context, memory);
		memory.putVariable(varname, value, scope);
	}

}