/*
* @(#)$Id: Matches.java 3619 2008-03-26 07:23:03Z yui $
*
* Copyright 2006-2008 Makoto YUI
*
* Licensed 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.
*
* Contributors:
* Makoto YUI - initial implementation
*/
package xbird.xquery.func.string;
import java.util.List;
import java.util.regex.*;
import xbird.xquery.DynamicError;
import xbird.xquery.XQueryException;
import xbird.xquery.dm.value.Item;
import xbird.xquery.dm.value.Sequence;
import xbird.xquery.dm.value.sequence.ValueSequence;
import xbird.xquery.dm.value.xsi.BooleanValue;
import xbird.xquery.expr.XQExpression;
import xbird.xquery.func.*;
import xbird.xquery.meta.DynamicContext;
import xbird.xquery.meta.StaticContext;
import xbird.xquery.type.Type;
import xbird.xquery.type.TypeRegistry;
import xbird.xquery.type.xs.BooleanType;
import xbird.xquery.type.xs.StringType;
/**
* fn:matches.
* <DIV lang="en">
* The function returns true if $input matches the regular expression supplied as
* $pattern as influenced by the value of $flags, if present; otherwise, it returns false.
* <ul>
* <li>fn:matches($input as xs:string?, $pattern as xs:string) as xs:boolean</li>
* <li>fn:matches($input as xs:string?, $pattern as xs:string, $flags as xs:string) as xs:boolean</li>
* </ul>
* </DIV>
* <DIV lang="ja"></DIV>
*
* @author Makoto YUI (yuin405+xbird@gmail.com)
* @link http://www.w3.org/TR/xquery-operators/#func-matches
* @link http://www.w3.org/TR/xquery-operators/#flags
*/
public final class Matches extends BuiltInFunction {
private static final long serialVersionUID = 226707058370060178L;
public static final String SYMBOL = "fn:matches";
public Matches() {
super(SYMBOL, BooleanType.BOOLEAN);
}
protected FunctionSignature[] signatures() {
final FunctionSignature[] s = new FunctionSignature[2];
Type strq = TypeRegistry.safeGet("xs:string?");
s[0] = new FunctionSignature(getName(), new Type[] { strq, StringType.STRING });
s[1] = new FunctionSignature(getName(), new Type[] { strq, StringType.STRING,
StringType.STRING });
return s;
}
@Override
public Function staticAnalysis(StaticContext context, List<? extends XQExpression> params)
throws XQueryException {
// TODO performance pre-compile
return super.staticAnalysis(context, params);
}
public BooleanValue eval(Sequence<? extends Item> contextSeq, ValueSequence argv, DynamicContext dynEnv)
throws XQueryException {
final int arglen = argv.size();
Item firstItem = argv.getItem(0);
// If $input is the empty sequence, it is interpreted as the zero-length string.
String input = firstItem.isEmpty() ? "" : firstItem.stringValue();
Item secondItem = argv.getItem(1);
String pattern = secondItem.stringValue();
int flags = Pattern.UNIX_LINES;
if(arglen == 3) {
Item thirdItem = argv.getItem(2);
String flagsStr = thirdItem.stringValue();
flags = convertFlags(flagsStr);
}
final Pattern compiled;
try {
compiled = Pattern.compile(pattern, flags);
} catch (PatternSyntaxException pse) {
throw new DynamicError("err:FORX0002", "Invalid pattern: " + pattern);
}
Matcher matcher = compiled.matcher(input);
final boolean match = matcher.matches();
return match ? BooleanValue.TRUE : BooleanValue.FALSE;
}
public static int convertFlags(final String flags) throws DynamicError {
assert (flags != null);
int ret = Pattern.UNIX_LINES;
for(int i = 0; i < flags.length(); i++) {
char c = flags.charAt(i);
switch(c) {
case 's':
ret |= Pattern.DOTALL;
break;
case 'm':
ret |= Pattern.MULTILINE;
break;
case 'i':
ret |= (Pattern.CASE_INSENSITIVE | Pattern.UNICODE_CASE);
break;
case 'x':
ret |= Pattern.COMMENTS;
break;
default:
throw new DynamicError("err:FORX0001", "Unsupported flag: `" + c + '`');
}
}
return ret;
}
}