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