/*******************************************************************************
* Copyright (c) 2007 Red Hat, Inc.
* Distributed under license by Red Hat, Inc. All rights reserved.
* This program is 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:
* Red Hat, Inc. - initial API and implementation
******************************************************************************/
package org.jboss.tools.common.el.internal.core.parser.token;
import org.jboss.tools.common.el.core.ElCoreMessages;
import org.jboss.tools.common.el.core.parser.ITokenDescription;
import org.jboss.tools.common.el.core.parser.Tokenizer;
/**
*
* @author V. Kabanovich
*
*/
public class OperationTokenDescription implements ITokenDescription {
public static final int OPERATION = 12;
static String[] OPS = {
"&&", "||", "==", "!=", "<=", ">=", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ //$NON-NLS-6$
"+", "-", "*", "/", "&", "%", "|", "?" , ":", "^", "<", ">", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ //$NON-NLS-6$ //$NON-NLS-7$ //$NON-NLS-8$ //$NON-NLS-9$ //$NON-NLS-10$ //$NON-NLS-11$ //$NON-NLS-12$
};
private static final String[] OPS_2 = {
"div", "and", "or", "not", "mod", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$
"eq", "ne", "lt", "gt", "ge", "le", //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$ //$NON-NLS-5$ //$NON-NLS-6$
};
public static OperationTokenDescription INSTANCE = new OperationTokenDescription();
public String getName() {
return ElCoreMessages.OperationTokenDescription_Name;
}
public int getType() {
return OPERATION;
}
public boolean isStart(Tokenizer tokenizer, int offset) {
int end = -1;
boolean canBeFollowedByOperand = true;
for (int i = 0; end < 0 && i < OPS.length; i++) {
if(tokenizer.startsWith(OPS[i])) {
end = offset + OPS[i].length();
}
}
for (int i = 0; end < 0 && i < OPS_2.length; i++) {
if(tokenizer.startsWith(OPS_2[i])) {
end = offset + OPS_2[i].length();
canBeFollowedByOperand = false;
}
}
if(end < 0) return false;
char ch = tokenizer.lookUpChar(end);
if(Character.isWhitespace(ch) || ch == '\0' || !Character.isJavaIdentifierPart(ch)
|| (canBeFollowedByOperand && Character.isJavaIdentifierPart(ch)
|| ch == '\'' || ch == '"' || ch == '-')) {
return true;
}
return false;
}
public boolean read(Tokenizer tokenizer, int offset) {
if(!isStart(tokenizer, offset)) {
return false;
}
int end = -1;
for (int i = 0; end < 0 && i < OPS.length; i++) {
if(tokenizer.startsWith(OPS[i])) {
end = offset + OPS[i].length();
}
}
for (int i = 0; end < 0 && i < OPS_2.length; i++) {
if(tokenizer.startsWith(OPS_2[i])) {
end = offset + OPS_2[i].length();
}
}
tokenizer.addToken(OPERATION, offset, end);
return true;
}
}