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An OSGi bundle for Saxon-HE
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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// 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.om;


import net.sf.saxon.event.Stripper;

import java.util.Arrays;

/**
 * A whitespace stripping rule that strips whitespace according to the rules defined for XSLT stylesheets
 */

public class StylesheetSpaceStrippingRule implements SpaceStrippingRule {

    //    Any child of one of the following elements is removed from the tree,
    //    regardless of any xml:space attributes. Note that this array must be in numeric
    //    order for binary chop to work correctly.

    private static final int[] specials = {
            StandardNames.XSL_ANALYZE_STRING,
            StandardNames.XSL_APPLY_IMPORTS,
            StandardNames.XSL_APPLY_TEMPLATES,
            StandardNames.XSL_ATTRIBUTE_SET,
            StandardNames.XSL_CALL_TEMPLATE,
            StandardNames.XSL_CHARACTER_MAP,
            StandardNames.XSL_CHOOSE,
            StandardNames.XSL_EVALUATE,
            StandardNames.XSL_MERGE,
            StandardNames.XSL_MERGE_SOURCE,
            StandardNames.XSL_NEXT_ITERATION,
            StandardNames.XSL_NEXT_MATCH,
            StandardNames.XSL_STYLESHEET,
            StandardNames.XSL_TRANSFORM
    };

    private NamePool namePool;

    public StylesheetSpaceStrippingRule(NamePool pool) {
        this.namePool = pool;
    }

    /**
    * Decide whether an element is in the set of white-space preserving element types
     * @param elementName identifies the element being tested
     */

    public byte isSpacePreserving(/*@NotNull*/ NodeName elementName) {
        if (!elementName.hasFingerprint()) {
            elementName.allocateNameCode(namePool);
        }
        int fingerprint = elementName.getFingerprint();
        if (fingerprint == (StandardNames.XSL_TEXT & NamePool.FP_MASK)) {
            return Stripper.ALWAYS_PRESERVE;
        }

        if (Arrays.binarySearch(specials, fingerprint) >= 0) {
            return Stripper.ALWAYS_STRIP;
        }

        return Stripper.STRIP_DEFAULT;
    }


}