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/* |
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$Id $ |
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|
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Copyright (C) 2010 Nicklas Nordborg |
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This file is part of BASE - BioArray Software Environment. |
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Available at http://base.thep.lu.se/ |
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8 |
|
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BASE is free software; you can redistribute it and/or |
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modify it under the terms of the GNU General Public License |
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as published by the Free Software Foundation; either version 3 |
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of the License, or (at your option) any later version. |
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|
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BASE 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 BASE. If not, see <http://www.gnu.org/licenses/>. |
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*/ |
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package net.sf.basedb.util.jep; |
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|
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import java.io.IOException; |
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import java.io.NotSerializableException; |
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import java.io.ObjectInputStream; |
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import java.io.ObjectOutputStream; |
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import java.io.Serializable; |
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import java.util.Stack; |
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|
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import org.nfunk.jep.FunctionTable; |
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import org.nfunk.jep.JEP; |
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import org.nfunk.jep.Node; |
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import org.nfunk.jep.ParseException; |
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import org.nfunk.jep.Token; |
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import org.nfunk.jep.function.PostfixMathCommandI; |
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|
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/** |
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Extension to the JEP parser that provides better error handling for |
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unknown functions. The normal error message when JEP encounters |
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an unknown function is: Syntax Error (implicit multiplication not enabled). |
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This is not very informative so this class improves the error handling |
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by giving a message: Unknown function foo() instead. |
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|
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@author Nicklas |
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@since 2.15 |
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@base.modified $Date $ |
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*/ |
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public class FunctionSafeJep |
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extends JEP |
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{ |
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|
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/** |
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Create a new function-safe JEP parser. |
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*/ |
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public FunctionSafeJep() |
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{ |
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super(); |
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} |
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|
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/** |
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Overrides the regular function lookup table by replacing it with a |
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function table that pretends that all functions has been registered, |
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but then generates an error message if it doesn't exists. |
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*/ |
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@Override |
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public void initFunTab() |
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{ |
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this.funTab = new SafeFunctionTable(this); |
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} |
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|
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/** |
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Adds an error message to the "real" JEP parser. |
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*/ |
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@SuppressWarnings("unchecked") |
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void addError(String error) |
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{ |
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this.errorList.add(error); |
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} |
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|
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/** |
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Override the superclass method so that exceptions are passed on |
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instead of swallowed. |
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@since 3.0 |
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*/ |
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@Override |
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public Object getValueAsObject() |
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{ |
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Node topNode = getTopNode(); |
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if (topNode == null || hasError()) return null; |
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try |
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{ |
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return this.ev.getValue(topNode, this.symTab); |
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} |
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catch (ParseException ex) |
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{ |
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throw new RuntimeException(ex); |
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} |
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} |
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|
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/** |
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Function table implementation that pretends that all possible functions |
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exists, but sends an error message if someone tries to use a function that |
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doesn't really exists. |
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*/ |
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static class SafeFunctionTable |
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extends FunctionTable |
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{ |
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|
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private static final long serialVersionUID = 4430148600636575401L; |
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private final FunctionSafeJep jep; |
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SafeFunctionTable(FunctionSafeJep jep) |
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{ |
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super(); |
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this.jep = jep; |
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} |
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|
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|
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/** |
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If the key is already registered, return TRUE. If the key is not |
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registered and is a function, register it as an unknown function, |
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set an error message and return TRUE. Otherwise return FALSE. |
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*/ |
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@Override |
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public boolean containsKey(Object key) |
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{ |
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boolean exists = super.containsKey(key); |
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if (!exists && key instanceof String) |
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{ |
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String name = (String)key; |
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if ("(".equals(nextToken(name))) |
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{ |
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super.put(key, new UnknownFunction(name)); |
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jep.addError("Unknown function: " + name + "()"); |
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exists = true; |
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} |
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} |
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return exists; |
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} |
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|
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/** |
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Get the next token in the parser. If this is a "(", the |
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parse is currently looking up a function name. |
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@param token The current token |
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*/ |
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private String nextToken(String token) |
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{ |
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String next = null; |
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Token t = jep.parser.token; |
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while (t != null) |
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{ |
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if (token.equals(t.image)) |
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{ |
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if (t.next != null) next = t.next.image; |
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break; |
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} |
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t = t.next; |
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} |
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return next; |
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} |
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|
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// This class is not serializable |
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private void readObject(ObjectInputStream ois) |
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throws ClassNotFoundException, IOException |
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{ |
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throw new NotSerializableException(); |
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} |
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private void writeObject(ObjectOutputStream ois) |
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throws IOException |
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{ |
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throw new NotSerializableException(); |
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} |
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|
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} |
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|
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/** |
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Represents an unknown function that appears in an expression. |
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The error is usually catched at parse time, otherwise it will |
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be catched at evaluation time by this class. |
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*/ |
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static class UnknownFunction |
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implements PostfixMathCommandI, Serializable |
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{ |
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|
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private static final long serialVersionUID = 8761224046553039046L; |
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private final String name; |
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UnknownFunction(String name) |
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{ |
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this.name = name; |
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} |
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|
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/* |
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From the PostfixMathCommandI interface |
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------------------------------------------- |
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*/ |
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@Override |
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public boolean checkNumberOfParameters(int numParameters) |
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{ |
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return true; |
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} |
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@Override |
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public int getNumberOfParameters() |
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{ |
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return -1; |
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} |
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@Override |
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@SuppressWarnings({"rawtypes"}) |
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public void run(Stack paramStack) |
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throws ParseException |
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{ |
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throw new ParseException("Unknown function: " + name + "()"); |
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} |
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@Override |
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public void setCurNumberOfParameters(int numParameters) |
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{} |
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// --------------------------------------- |
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|
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} |
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|
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} |