69 lines
2.1 KiB
Java
69 lines
2.1 KiB
Java
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// EvaluationSource.java
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// FESI Copyright (c) Jean-Marc Lugrin, 1999
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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// This program 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 GNU
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// Lesser General Public License for more details.
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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package FESI.Interpreter;
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/**
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* Abstract declaration of an evaluation source. An evaluation
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* source is used to describe the source of a program for
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* error messages and debugging purpose.
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*/
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public abstract class EvaluationSource {
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/**
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* The end of line string for this machine.
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*/
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protected String eol = System.getProperty("line.separator", "\n");
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/**
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* The previous source in case of multi-level evaluation.
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*/
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protected EvaluationSource previousSource = null;
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/**
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* Create a evaluation source linked to the previous source
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* (which can be null)
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*/
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public EvaluationSource(EvaluationSource previousSource) {
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super();
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this.previousSource = previousSource;
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}
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/**
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* Return a description of the evaluation source. Must be
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* implemented for each specific evaluation source.
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*/
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abstract protected String getEvaluationSourceText();
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/**
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* Display the description of the evaluation source
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*/
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public String toString() {
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return getEvaluationSourceText();
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}
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/**
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* Return an evaluation source number if defined
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* @return -1 if not defined
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*/
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public int getLineNumber() {
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if (previousSource != null) {
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return previousSource.getLineNumber();
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}
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return -1; // undefined
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}
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}
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