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PlantUML is a component that allows to quickly write diagrams from text.
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// THIS FILE HAS BEEN GENERATED BY A PREPROCESSOR.
/* +=======================================================================
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* | PlantUML : a free UML diagram generator
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* (C) Copyright 2009-2024, Arnaud Roques
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*/
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.text.StringLocated;
import net.sourceforge.plantuml.tim.EaterException;
import net.sourceforge.plantuml.tim.TContext;
import net.sourceforge.plantuml.tim.TFunction;
import net.sourceforge.plantuml.tim.TFunctionSignature;
import net.sourceforge.plantuml.tim.TMemory;
public class ReversePolishInterpretor {
private final TValue result;
private final boolean trace = false;
public ReversePolishInterpretor(StringLocated location, TokenStack queue, Knowledge knowledge, TMemory memory,
TContext context) throws EaterException {
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 new EaterException("bad op", location);
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 new EaterException("rpn43", location);
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 new EaterException("Unknown built-in function " + token2.getSurface(), location);
if (function.canCover(nb, Collections.emptySet()) == false)
throw new EaterException("Bad number of arguments for " + function.getSignature().getFunctionName(), location);
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 new EaterException("rpn44", location);
final TValue r = function.executeReturnFunction(context, memory, location, args,
Collections.emptyMap());
if (trace)
System.err.println("r=" + r);
stack.addFirst(r);
} else {
throw new EaterException("rpn41", location);
}
}
result = stack.removeFirst();
}
public final TValue getResult() {
return result;
}
}