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The source code/* * Copyright 1999-2004 The Apache Software Foundation * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.apache.commons.jxpath.ri; import java.io.StringReader; import org.apache.commons.jxpath.JXPathException; import org.apache.commons.jxpath.ri.parser.ParseException; import org.apache.commons.jxpath.ri.parser.TokenMgrError; import org.apache.commons.jxpath.ri.parser.XPathParser; /** * XPath parser * * @author Dmitri Plotnikov * @version $Revision: 1.8 $ $Date: 2004/02/29 14:17:45 $ */ public class Parser { private static XPathParser parser = new XPathParser(new StringReader("")); /** * Parses the XPath expression. Throws a JXPathException in case * of a syntax error. */ public static Object parseExpression( String expression, Compiler compiler) { synchronized (parser) { parser.setCompiler(compiler); Object expr = null; try { parser.ReInit(new StringReader(expression)); expr = parser.parseExpression(); } catch (TokenMgrError e) { throw new JXPathException( "Invalid XPath: '" + addEscapes(expression) + "'. Invalid symbol '" + addEscapes(String.valueOf(e.getCharacter())) + "' " + describePosition(expression, e.getPosition())); } catch (ParseException e) { throw new JXPathException( "Invalid XPath: '" + addEscapes(expression) + "'. Syntax error " + describePosition( expression, e.currentToken.beginColumn)); } return expr; } } private static String describePosition(String expression, int position) { if (position <= 0) { return "at the beginning of the expression"; } else if (position >= expression.length()) { return "- expression incomplete"; } else { return "after: '" + addEscapes(expression.substring(0, position)) + "'"; } } private static String addEscapes(String string) { // Piggy-back on the code generated by JavaCC return TokenMgrError.addEscapes(string); } } |
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