| /* |
| * <copyright> |
| * |
| * Copyright (c) 2005, 2008 Sven Efftinge and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * Sven Efftinge - Initial API and implementation |
| * Artem Tikhomirov - LPG lexer/parser and error reporting |
| * |
| * </copyright> |
| */ |
| package org.eclipse.gmf.internal.xpand.util; |
| |
| import java.io.IOException; |
| import java.io.Reader; |
| |
| import org.eclipse.gmf.internal.xpand.ast.Template; |
| import org.eclipse.gmf.internal.xpand.model.XpandResource; |
| import org.eclipse.gmf.internal.xpand.parser.XpandLexer; |
| import org.eclipse.gmf.internal.xpand.parser.XpandParser; |
| import org.eclipse.gmf.internal.xpand.util.ParserException.ErrorLocationInfo; |
| |
| public class XpandResourceParser { |
| |
| // XXX everything except exact lexer and parser instances are the same as n XtendResourceParser |
| public XpandResource parse(final Reader source, final String qualifiedTemplateName) throws IOException, ParserException { |
| Template tpl = null; |
| XpandParser parser = null; |
| XpandLexer scanner = null; |
| final char[] buffer = new StreamConverter().toCharArray(source); |
| try { |
| scanner = new XpandLexer(buffer, qualifiedTemplateName); |
| parser = new XpandParser(scanner); |
| scanner.lexer(parser); |
| tpl = parser.parser(); |
| // FIXME handle errors if find out how to force generated parser to throw exception instead of consuming it |
| } catch (final Exception e) { |
| ErrorLocationInfo[] errors = extractErrors(scanner, parser); |
| if (errors.length == 0) { |
| throw new IOException("Unexpected exception while parsing"); |
| } else { |
| throw new ParserException(qualifiedTemplateName, errors); |
| } |
| } |
| if (tpl != null) { |
| // XXX two choices here - |
| // (1) pass any name into parse method, do not assume it's fqn and move setFQN outside of this method |
| // (2) assume fqn is passed into parse() as it's now. |
| tpl.setFullyQualifiedName(qualifiedTemplateName); |
| return tpl; |
| } |
| ErrorLocationInfo[] errors = extractErrors(scanner, parser); |
| assert errors.length > 0 : "otherwise, no reason not to get template"; |
| throw new ParserException(qualifiedTemplateName, errors); |
| } |
| |
| // FIXME do it in the parser itself, though keeping errors separate may help |
| // those willing to report them separately |
| private static ErrorLocationInfo[] extractErrors(XpandLexer scanner, XpandParser parser) { |
| ErrorLocationInfo[] e1 = scanner.getErrors(); |
| ErrorLocationInfo[] e2 = parser.getErrors(); |
| ErrorLocationInfo[] res = new ErrorLocationInfo[e1.length + e2.length]; |
| System.arraycopy(e1, 0, res, 0, e1.length); |
| System.arraycopy(e2, 0, res, e1.length, e2.length); |
| return res; |
| } |
| } |