package client.net.sf.saxon.ce.functions;
import client.net.sf.saxon.ce.expr.XPathContext;
import client.net.sf.saxon.ce.om.Item;
import client.net.sf.saxon.ce.om.NameChecker;
import client.net.sf.saxon.ce.om.SequenceIterator;
import client.net.sf.saxon.ce.trans.XPathException;
import client.net.sf.saxon.ce.tree.util.FastStringBuffer;
import client.net.sf.saxon.ce.tree.util.UTF16CharacterSet;
import client.net.sf.saxon.ce.value.NumericValue;
import client.net.sf.saxon.ce.value.StringValue;
/**
* This class supports the function codepoints-to-string
*/
public class CodepointsToString extends SystemFunction {
public CodepointsToString newInstance() {
return new CodepointsToString();
}
/**
* Evaluate
*/
public Item evaluateItem(XPathContext c) throws XPathException {
FastStringBuffer sb = new FastStringBuffer(FastStringBuffer.SMALL);
SequenceIterator si = argument[0].iterate(c);
while (true) {
NumericValue nextInt = (NumericValue)si.next();
if (nextInt == null) {
break;
}
long next = nextInt.intValue();
if (next < 0 || next > Integer.MAX_VALUE || !NameChecker.isValidChar((int)next)) {
XPathException e = new XPathException("Invalid XML character [x " + Integer.toHexString((int)next) + ']');
e.setErrorCode("FOCH0001");
e.setXPathContext(c);
throw e;
}
if (next<65536) {
sb.append((char)next);
} else { // output a surrogate pair
sb.append(UTF16CharacterSet.highSurrogate((int)next));
sb.append(UTF16CharacterSet.lowSurrogate((int)next));
}
}
return StringValue.makeStringValue(sb.condense());
}
}
// This Source Code Form is subject to the terms of the Mozilla Public License, v. 2.0.
// If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
// This Source Code Form is “Incompatible With Secondary Licenses”, as defined by the Mozilla Public License, v. 2.0.