| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.netbeans.modules.web.el; |
| |
| import com.sun.el.parser.Node; |
| import java.util.logging.Logger; |
| import javax.el.ELException; |
| import javax.swing.event.ChangeListener; |
| import javax.swing.text.Document; |
| import org.netbeans.modules.csl.api.OffsetRange; |
| import org.netbeans.modules.parsing.api.Snapshot; |
| import org.netbeans.modules.parsing.api.Task; |
| import org.netbeans.modules.parsing.spi.ParseException; |
| import org.netbeans.modules.parsing.spi.Parser; |
| import org.netbeans.modules.parsing.spi.SourceModificationEvent; |
| import org.netbeans.modules.web.common.api.Constants; |
| |
| /** |
| * Parser for Expression Language, uses {@link com.sun.el.parser.ELParser} underneath. |
| * |
| * @author Erno Mononen |
| */ |
| public final class ELParser extends Parser { |
| |
| //XXX hack |
| private static final String ATTRIBUTE_EL_MARKER = "A"; //NOI18N |
| |
| private static final Logger LOGGER = Logger.getLogger(ELParser.class.getName()); |
| private final Document document; |
| private ELParserResult result; |
| |
| private ELParser(Document document) { |
| this.document = document; |
| } |
| |
| public ELParser() { |
| this(null); |
| } |
| |
| public static ELParser create(final Document document) { |
| return new ELParser(document); |
| } |
| |
| /** |
| * Parses the given EL expression and returns the root AST node for it. |
| * |
| * @param expr the expression to parse. |
| * @return the root AST node |
| * @throws {@link javax.el.ELException} if the given expression is not valid EL. |
| */ |
| public static Node parse(ELPreprocessor expr) { |
| return com.sun.el.parser.ELParser.parse(expr.getPreprocessedExpression()); |
| } |
| |
| //for unit tests |
| static Node parse(String expr) { |
| return com.sun.el.parser.ELParser.parse(expr); |
| } |
| |
| @Override |
| public void parse(Snapshot snapshot, Task task, SourceModificationEvent event) throws ParseException { |
| this.result = new ELParserResult(snapshot); |
| |
| final String expressionSeparator = Constants.LANGUAGE_SNIPPET_SEPARATOR; //NOI18N |
| String[] sources = snapshot.getText().toString().split(expressionSeparator); //NOI18N |
| int embeddedOffset = 0; |
| for (String expression : sources) { |
| int startOffset = embeddedOffset; |
| int endOffset = startOffset + expression.length(); |
| embeddedOffset += (expression.length() + expressionSeparator.length()); |
| |
| ELPreprocessor elPreprocessor; |
| //hack - we need to distinguish EL inside and outside of attribute values |
| //since there's no API in parsing.api how to set some metadata to the virtual source |
| //it is done this ugly way |
| if(expression.endsWith(ATTRIBUTE_EL_MARKER)) { |
| //inside attribute |
| endOffset--; |
| expression = expression.substring(0, expression.length() - 1); |
| elPreprocessor = new ELPreprocessor(expression, |
| ELPreprocessor.XML_ENTITY_REFS_CONVERSION_TABLE, |
| ELPreprocessor.ESCAPED_CHARACTERS); |
| } else { |
| elPreprocessor = new ELPreprocessor(expression, |
| ELPreprocessor.XML_ENTITY_REFS_CONVERSION_TABLE); |
| } |
| OffsetRange embeddedRange = new OffsetRange(startOffset, endOffset); |
| try { |
| Node node = parse(elPreprocessor); |
| result.addValidElement(node, elPreprocessor, embeddedRange); |
| } catch (ELException ex) { |
| result.addErrorElement(ex, elPreprocessor, embeddedRange); |
| } |
| } |
| |
| } |
| |
| @Override |
| public Result getResult(Task task) throws ParseException { |
| assert result != null; |
| return result; |
| } |
| |
| @Override |
| public void cancel(CancelReason reason, SourceModificationEvent event) { |
| } |
| |
| @Override |
| public void addChangeListener(ChangeListener changeListener) { |
| } |
| |
| @Override |
| public void removeChangeListener(ChangeListener changeListener) { |
| } |
| } |