/*
* 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.apache.directory.studio.openldap.config.acl.sourceeditor;
import org.eclipse.jface.text.rules.ICharacterScanner;
import org.eclipse.jface.text.rules.IToken;
import org.eclipse.jface.text.rules.Token;
/**
* Rule to detect a "group[/objectclass[/attrname]][.type]=" clause.
*
* @author <a href="mailto:dev@directory.apache.org">Apache Directory Project</a>
*/
public class GroupRule extends AbstractRule
{
/**
* The "dn" char sequence.
*/
private static char[] GROUP_SEQUENCE = new char[]
{ 'g', 'r', 'o', 'u', 'p' };
/**
* The array of the types char sequences
*/
private static char[][] TYPES_SEQUENCES = new char[][]
{
new char[]
{ 'e', 'x', 'p', 'a', 'n', 'd' },
new char[]
{ 'e', 'x', 'a', 'c', 't' }
};
/**
* Creates a new instance of GroupRule.
*
* @param token the associated token
*/
public GroupRule( IToken token )
{
super( token );
}
/**
* {@inheritDoc}
*/
public IToken evaluate( ICharacterScanner scanner, boolean resume )
{
// Looking for "group"
if ( matchGroup( scanner ) )
{
// Looking for '='
if ( matchEqual( scanner ) )
{
// Token evaluation complete
return token;
}
// Looking for '/'
else if ( matchSlash( scanner ) )
{
// Going forward until we find a '=', '/' or '.' char
boolean atLeastFoundOneChar = false;
while ( doesNotMatchEqualSlashOrDot( scanner ) )
{
atLeastFoundOneChar = true;
}
// Checking if we found at least one char
if ( atLeastFoundOneChar )
{
// Looking for '='
if ( matchEqual( scanner ) )
{
// Token evaluation complete
return token;
}
// Looking for '/'
else if ( matchSlash( scanner ) )
{
// Going forward until we find a '=' or '.' char
boolean atLeastFoundOneChar2 = false;
while ( doesNotMatchEqualOrDot( scanner ) )
{
atLeastFoundOneChar2 = true;
}
// Checking if we found at least one char
if ( atLeastFoundOneChar2 )
{
// Looking for '='
if ( matchEqual( scanner ) )
{
// Token evaluation complete
return token;
}
// Looking for '.'
else if ( matchDot( scanner ) )
{
// Looking for one of the types
if ( matchType( scanner ) )
{
// Looking for '='
if ( matchEqual( scanner ) )
{
// Token evaluation complete
return token;
}
}
}
}
}
// Looking for '.'
else if ( matchDot( scanner ) )
{
// Looking for one of the types
if ( matchType( scanner ) )
{
// Looking for '='
if ( matchEqual( scanner ) )
{
// Token evaluation complete
return token;
}
}
}
}
}
// Looking for '.'
else if ( matchDot( scanner ) )
{
// Looking for one of the types
if ( matchType( scanner ) )
{
// Looking for '='
if ( matchEqual( scanner ) )
{
// Token evaluation complete
return token;
}
}
}
}
return Token.UNDEFINED;
}
/**
* {@inheritDoc}
*/
public IToken evaluate( ICharacterScanner scanner )
{
return this.evaluate( scanner, false );
}
/**
* Checks if the "group" char sequence matches the scanner input.
*
* @param scanner the scanner input
* @return <code>true</code> if the scanner input matches the "group" char sequence,
* <code>false</code> if not.
*/
private boolean matchGroup( ICharacterScanner scanner )
{
return matchCharSequence( scanner, GROUP_SEQUENCE );
}
/**
* Checks if one of the types char sequence matches the scanner input.
*
* @param scanner the scanner input
* @return <code>true</code> if the scanner input matches one of the types char sequence,
* <code>false</code> if not.
*/
private boolean matchType( ICharacterScanner scanner )
{
for ( char[] typeSequence : TYPES_SEQUENCES )
{
if ( matchCharSequence( scanner, typeSequence ) )
{
return true;
}
}
return false;
}
/**
* Checks if the '{' char matches the scanner input.
*
* @param scanner the scanner input
* @return <code>true</code> if the scanner input matches the '{' char,
* <code>false</code> if not.
*/
private boolean matchSlash( ICharacterScanner scanner )
{
return matchChar( scanner, '/' );
}
/**
* Checks if the '.' char matches the scanner input.
*
* @param scanner the scanner input
* @return <code>true</code> if the scanner input matches the '.' char,
* <code>false</code> if not.
*/
private boolean matchDot( ICharacterScanner scanner )
{
return matchChar( scanner, '.' );
}
/**
* Checks if the '=' char matches the scanner input.
*
* @param scanner the scanner input
* @return <code>true</code> if the scanner input matches the '=' char,
* <code>false</code> if not.
*/
private boolean matchEqual( ICharacterScanner scanner )
{
return matchChar( scanner, '=' );
}
/**
* Checks if the '=', '/' or '.' chars don't match the scanner input.
*
* @param scanner the scanner input
* @return <code>true</code> if the scanner input don't match the '=', '/' or '.' char,
* <code>false</code> if it does.
*/
private boolean doesNotMatchEqualSlashOrDot( ICharacterScanner scanner )
{
if ( matchEOF( scanner ) )
{
scanner.unread();
return false;
}
else if ( matchChar( scanner, '=' ) )
{
scanner.unread();
return false;
}
else if ( matchChar( scanner, '/' ) )
{
scanner.unread();
return false;
}
else if ( matchChar( scanner, '.' ) )
{
scanner.unread();
return false;
}
else
{
scanner.read();
return true;
}
}
/**
* Checks if the '=' or '.' chars don't match the scanner input.
*
* @param scanner the scanner input
* @return <code>true</code> if the scanner input don't match the '=' or '.' char,
* <code>false</code> if it does.
*/
private boolean doesNotMatchEqualOrDot( ICharacterScanner scanner )
{
if ( matchEOF( scanner ) )
{
scanner.unread();
return false;
}
else if ( matchChar( scanner, '=' ) )
{
scanner.unread();
return false;
}
else if ( matchChar( scanner, '.' ) )
{
scanner.unread();
return false;
}
else
{
scanner.read();
return true;
}
}
}