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/**
* <copyright>
*
* Copyright (c) 2005, 2006 Springsite BV (The Netherlands) 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:
* Martin Taal
* </copyright>
*
* $Id: AnnotationParser.java,v 1.7 2006/09/07 22:27:42 mtaal Exp $
*/
package org.eclipse.emf.teneo.annotations.parser;
import java.util.ArrayList;
import java.util.List;
import org.eclipse.emf.ecore.ENamedElement;
/**
* Parses an annotation and creates a tree of parserNodes.
*
* See AnnotationTokenizer for a short description on the type of parsed
* tokens.
*
* @author <a href="mailto:mtaal at elver.org">Martin Taal</a>
*/
public class AnnotationParser {
/** The StringTokenizer being used */
private AnnotationTokenizer annotationTokenizer;
/** The list of root nodes */
private List parserNodes = new ArrayList();
/** Parses the content and returns a list of parsernodes */
public List parse(ENamedElement eNamedElement, String content) {
annotationTokenizer = new AnnotationTokenizer(eNamedElement, content);
parserNodes.clear();
int token;
while (annotationTokenizer.getCurrentToken() != AnnotationTokenizer.T_EOF &&
(token = annotationTokenizer.nextToken()) != AnnotationTokenizer.T_EOF) {
if (token != AnnotationTokenizer.T_TYPENAME) {
throw new AnnotationParserException("Only typenames are allowed at the root of the " +
"annotation, see _ for the error " + annotationTokenizer.getErrorText());
}
parseTypeName(null);
}
return parserNodes;
}
/** Adds a child to the parent */
private void addToParent(NamedParserNode parent, NamedParserNode child) {
if (parent == null) return;
if (parent instanceof ComplexNode) {
((ComplexNode)parent).getChildren().add(child);
} else if (parent instanceof ArrayValueNode) {
((ArrayValueNode)parent).getChildren().add(child);
} else if (parent instanceof ReferenceValueNode) {
((ReferenceValueNode)parent).setValue(child);
}
}
/** Parse a type name (a complex type) */
private void parseTypeName(NamedParserNode pn) {
final ComplexNode cn = new ComplexNode();
cn.setName(annotationTokenizer.getLexeme());
addToParent(pn, cn);
if (pn == null) {
parserNodes.add(cn);
}
// now parse the next token
final int token = annotationTokenizer.nextToken();
switch (token) {
case AnnotationTokenizer.T_EOF:
return;
case AnnotationTokenizer.T_CONTENTSTART:
parseContent(cn);
break;
case AnnotationTokenizer.T_TYPENAME:
parseTypeName(null); // the next one
break;
case AnnotationTokenizer.T_COMMA: // in case of array
if (!(pn instanceof ArrayValueNode)) {
throw new AnnotationParserException("Encountered comma but not within an array definition, see _ for error location " +
annotationTokenizer.getErrorText());
}
return;
default:
throw new AnnotationParserException("Unknown token, see _ for error position: " +
annotationTokenizer.getErrorText());
}
}
/** Parse the content of a typeName */
private void parseContent(NamedParserNode pn) {
// content can either be an array or a set of values
boolean finished = false;
while (!finished) {
final int token = annotationTokenizer.nextToken();
switch (token) {
case AnnotationTokenizer.T_EOF:
throw new AnnotationParserException("Unexcepted end to annotation string, " +
annotationTokenizer.getErrorText());
case AnnotationTokenizer.T_CONTENTEND:
return;
case AnnotationTokenizer.T_IDENTIFIER:
final String identifier = annotationTokenizer.getLexeme();
// next token must be an is
int nextToken = annotationTokenizer.nextToken();
if (nextToken == AnnotationTokenizer.T_CONTENTEND) {
final PrimitiveValueNode vn = new PrimitiveValueNode();
vn.setName("value");
vn.setValue(identifier);
addToParent(pn, vn);
return;
}
if (nextToken != AnnotationTokenizer.T_IS) {
throw new AnnotationParserException("No = character after identifier, see _ for error position " +
annotationTokenizer.getErrorText());
}
nextToken = annotationTokenizer.nextToken();
if (nextToken == AnnotationTokenizer.T_VALUE) {
final String value = annotationTokenizer.getLexeme();
final PrimitiveValueNode vn = new PrimitiveValueNode();
vn.setName(identifier);
vn.setValue(value);
addToParent(pn, vn);
}if (nextToken == AnnotationTokenizer.T_VALUE) {
final String value = annotationTokenizer.getLexeme();
final PrimitiveValueNode vn = new PrimitiveValueNode();
vn.setName(identifier);
vn.setValue(value);
addToParent(pn, vn);
} else if (nextToken == AnnotationTokenizer.T_IDENTIFIER) {
final String value = annotationTokenizer.getLexeme();
final PrimitiveValueNode vn = new PrimitiveValueNode();
vn.setName(identifier);
vn.setValue(value);
addToParent(pn, vn);
} else if (nextToken == AnnotationTokenizer.T_TYPENAME) {
final ReferenceValueNode rvn = new ReferenceValueNode();
rvn.setName(identifier);
parseTypeName(rvn);
addToParent(pn, rvn);
} else if (nextToken == AnnotationTokenizer.T_ARRAYSTART) {
final ArrayValueNode avn = new ArrayValueNode();
avn.setName(identifier);
parseArray(avn);
addToParent(pn, avn);
} else if (annotationTokenizer.nextToken() != AnnotationTokenizer.T_VALUE) {
throw new AnnotationParserException("No value token after =, see _ for error position " +
annotationTokenizer.getErrorText());
}
break;
case AnnotationTokenizer.T_ARRAYSTART:
// special case in which the main type is just a list of other types
// for example SecondaryTables which is just a list of SecondaryTable
parseArray(pn);
((ComplexNode)pn).setList(true);
break;
}
}
}
/** Parse an array */
private void parseArray(NamedParserNode pn) {
// content can either be an array or a set of values
final ArrayValueNode an = new ArrayValueNode();
addToParent(pn, an);
boolean finished = false;
while (!finished) {
final int token = annotationTokenizer.nextToken();
switch (token) {
case AnnotationTokenizer.T_EOF:
throw new AnnotationParserException("Unexcepted end to annotation string, " +
annotationTokenizer.getErrorText());
case AnnotationTokenizer.T_TYPENAME:
parseTypeName(an);
break;
case AnnotationTokenizer.T_IDENTIFIER:
an.getChildren().add(annotationTokenizer.getLexeme());
break;
case AnnotationTokenizer.T_COMMA:
break;
case AnnotationTokenizer.T_ARRAYEND:
return;
}
}
}
}
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