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80 lines
2.5 KiB
80 lines
2.5 KiB
//==============================================================================
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//
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// Copyright (c) 2002-
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// Authors:
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// * Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford, formerly University of Birmingham)
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//
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//------------------------------------------------------------------------------
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//
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// This file is part of PRISM.
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//
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// PRISM is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// PRISM is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with PRISM; if not, write to the Free Software Foundation,
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// Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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//
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//==============================================================================
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package parser.visitor;
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import parser.ast.*;
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import parser.type.*;
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import prism.PrismLangException;
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/**
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* Expand all constants, return result.
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*/
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public class ExpandConstants extends ASTTraverseModify
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{
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private ConstantList constantList;
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public ExpandConstants(ConstantList constantList)
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{
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this.constantList = constantList;
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}
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public Object visit(ExpressionConstant e) throws PrismLangException
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{
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int i;
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Type t;
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Expression expr;
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// See if identifier corresponds to a constant
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i = constantList.getConstantIndex(e.getName());
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if (i != -1) {
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// And check that the constant is defined
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if (constantList.getConstant(i) != null) {
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// If so, replace it with the corresponding expression
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expr = constantList.getConstant(i).deepCopy();
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// But also recursively expand that
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expr = (Expression) expr.expandConstants(constantList);
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// Put in brackets so precedence is preserved
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// (for display purposes only; in case of re-parse)
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// This is being done after type-checking so also set type
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t = expr.getType();
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expr = Expression.Parenth(expr);
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expr.setType(t);
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// Return replacement expression
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return expr;
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}
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else {
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// Error (should never happen)
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throw new PrismLangException("Undefined constant", e);
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}
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}
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else {
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// Error (should never happen)
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throw new PrismLangException("Undefined constant", e);
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}
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}
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}
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