////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2013 Saxonica Limited.
// 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.
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////

package net.sf.saxon.style;

import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.StringLiteral;
import net.sf.saxon.expr.instruct.Comment;
import net.sf.saxon.expr.instruct.Executable;
import net.sf.saxon.om.AttributeCollection;
import net.sf.saxon.om.StandardNames;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.value.StringValue;

/**
* An xsl:comment elements in the stylesheet. <br>
*/

public final class XSLComment extends XSLLeafNodeConstructor {

    public void prepareAttributes() throws XPathException {

        String selectAtt = null;

		AttributeCollection atts = getAttributeList();
		for (int a=0; a<atts.getLength(); a++) {
			String f = atts.getQName(a);
			if (f.equals(StandardNames.SELECT)) {
        		selectAtt = atts.getValue(a);
        	} else {
        		checkUnknownAttribute(atts.getNodeName(a));
        	}
        }

        if (selectAtt!=null) {
            select = makeExpression(selectAtt);
        }
    }

    public void validate(Declaration decl) throws XPathException {
        select = typeCheck("select", select);
        super.validate(decl);
    }

    /**
     * Get the error code to be returned when the element has a select attribute but is not empty.
     *
     * @return the error code defined for this condition, for this particular instruction
     */

    protected String getErrorCodeForSelectPlusContent() {
        return "XTSE0940";
    }

    /*@NotNull*/ public Expression compile(Executable exec, Declaration decl) throws XPathException {
        Comment inst = new Comment();
        compileContent(exec, decl, inst, new StringLiteral(StringValue.SINGLE_SPACE));
        return inst;
    }

}