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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.tim.expression;

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Deque;
import java.util.List;

import net.sourceforge.plantuml.tim.EaterException;
import net.sourceforge.plantuml.tim.EaterExceptionLocated;
import net.sourceforge.plantuml.tim.TContext;
import net.sourceforge.plantuml.tim.TFunction;
import net.sourceforge.plantuml.tim.TFunctionSignature;
import net.sourceforge.plantuml.tim.TMemory;
import net.sourceforge.plantuml.utils.LineLocation;

public class ReversePolishInterpretor {

	private final TValue result;
	private final boolean trace = false;

	public ReversePolishInterpretor(TokenStack queue, Knowledge knowledge, TMemory memory, TContext context)
			throws EaterException, EaterExceptionLocated {
		this(null, queue, knowledge, memory, context);
	}

	public ReversePolishInterpretor(LineLocation location, TokenStack queue, Knowledge knowledge, TMemory memory,
			TContext context) throws EaterException, EaterExceptionLocated {

		final Deque stack = new ArrayDeque<>();
		if (trace)
			System.err.println("ReversePolishInterpretor::queue=" + queue);
		for (TokenIterator it = queue.tokenIterator(); it.hasMoreTokens();) {
			final Token token = it.nextToken();
			if (trace)
				System.err.println("rpn " + token);
			if (token.getTokenType() == TokenType.NUMBER) {
				stack.addFirst(TValue.fromNumber(token));
			} else if (token.getTokenType() == TokenType.QUOTED_STRING) {
				stack.addFirst(TValue.fromString(token));
			} else if (token.getTokenType() == TokenType.JSON_DATA) {
				stack.addFirst(TValue.fromJson(token.getJson()));
			} else if (token.getTokenType() == TokenType.OPERATOR) {
				final TValue v2 = stack.removeFirst();
				final TValue v1 = stack.removeFirst();
				final TokenOperator op = token.getTokenOperator();
				if (op == null) {
					throw EaterException.unlocated("bad op");
				}
				final TValue tmp = op.operate(v1, v2);
				stack.addFirst(tmp);
			} else if (token.getTokenType() == TokenType.OPEN_PAREN_FUNC) {
				final int nb = Integer.parseInt(token.getSurface());
				final Token token2 = it.nextToken();
				if (token2.getTokenType() != TokenType.FUNCTION_NAME) {
					throw EaterException.unlocated("rpn43");
				}
				if (trace)
					System.err.println("token2=" + token2);
				final TFunction function = knowledge.getFunction(new TFunctionSignature(token2.getSurface(), nb));
				if (trace)
					System.err.println("function=" + function);
				if (function == null) {
					throw EaterException.unlocated("Unknown built-in function " + token2.getSurface());
				}
				if (function.canCover(nb, Collections.emptySet()) == false) {
					throw EaterException
							.unlocated("Bad number of arguments for " + function.getSignature().getFunctionName());
				}
				final List args = new ArrayList<>();
				for (int i = 0; i < nb; i++) {
					args.add(0, stack.removeFirst());
				}
				if (trace)
					System.err.println("args=" + args);
				if (location == null) {
					throw EaterException.unlocated("rpn44");
				}
				final TValue r = function.executeReturnFunction(context, memory, location, args,
						Collections.emptyMap());
				if (trace)
					System.err.println("r=" + r);
				stack.addFirst(r);
			} else {
				throw EaterException.unlocated("rpn41");
			}
		}
		result = stack.removeFirst();
	}

	public final TValue getResult() {
		return result;
	}
}