/*
* Copyright (c) 2006 Henri Sivonen
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*/
package org.whattf.datatype;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.ContextFactory;
import org.mozilla.javascript.EcmaError;
import org.mozilla.javascript.regexp.RegExpImpl;
import org.relaxng.datatype.DatatypeException;
/**
* This datatype shall accept the strings that are allowed as the value of the Web Forms 2.0
* <a href="http://whatwg.org/specs/web-forms/current-work/#pattern"><code>pattern</code></a>
* attribute.
* @version $Id$
* @author hsivonen
*/
public final class Pattern extends AbstractDatatype {
/**
* The singleton instance.
*/
public static final Pattern THE_INSTANCE = new Pattern();
/**
* Package-private constructor
*/
private Pattern() {
super();
}
/**
* Checks that the value compiles as an anchored JavaScript regular expression.
* @param literal the value
* @param context ignored
* @throws DatatypeException if the value isn't valid
* @see org.relaxng.datatype.Datatype#checkValid(java.lang.String, org.relaxng.datatype.ValidationContext)
*/
public void checkValid(CharSequence literal)
throws DatatypeException {
// TODO find out what kind of thread concurrency guarantees are made
ContextFactory cf = new ContextFactory();
Context cx = cf.enterContext();
RegExpImpl rei = new RegExpImpl();
String anchoredRegex = "^(?:" + literal + ")$";
try {
rei.compileRegExp(cx, anchoredRegex, "");
} catch (EcmaError ee) {
throw newDatatypeException(ee.getErrorMessage());
} finally {
Context.exit();
}
}
@Override
public String getName() {
return "pattern";
}
}