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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2022 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.instruct.NextMatch;
import net.sf.saxon.om.*;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.Type;
import net.sf.saxon.value.Whitespace;

/**
 * An xsl:next-match element in the stylesheet
 */

public class XSLNextMatch extends StyleElement {

    private boolean useTailRecursion = false;

    /**
     * Determine whether this node is an instruction.
     *
     * @return true - it is an instruction
     */

    @Override
    public boolean isInstruction() {
        return true;
    }

    /**
     * Determine whether this type of element is allowed to contain an xsl:fallback
     * instruction
     */

    @Override
    protected boolean mayContainFallback() {
        return true;
    }

    @Override
    protected void prepareAttributes() {

        for (AttributeInfo att : attributes()) {
            NodeName attName = att.getNodeName();
            checkUnknownAttribute(attName);
        }
    }

    @Override
    public void validate(ComponentDeclaration decl) throws XPathException {
        for (NodeInfo child : children()) {
            if (child instanceof XSLWithParam || child instanceof XSLFallback) {
                // OK;
            } else if (child.getNodeKind() == Type.TEXT) {
                // with xml:space=preserve, white space nodes may still be there
                if (!Whitespace.isAllWhite(child.getUnicodeStringValue())) {
                    compileError("No character data is allowed within xsl:next-match", "XTSE0010");
                }
            } else {
                compileError("Child element " + child.getDisplayName() +
                        " is not allowed as a child of xsl:next-match", "XTSE0010");
            }
        }

    }


    /**
     * Mark tail-recursive calls on templates and functions.
     * For most instructions, this does nothing.
     */

    @Override
    protected boolean markTailCalls() {
        useTailRecursion = true;
        return true;
    }

    /*@NotNull*/
    @Override
    public Expression compile(Compilation exec, ComponentDeclaration decl) throws XPathException {
        NextMatch inst = new NextMatch(useTailRecursion);
        inst.setLocation(allocateLocation());
        inst.setActualParams(getWithParamInstructions(inst, exec, decl, false));
        inst.setTunnelParams(getWithParamInstructions(inst, exec, decl, true));
        return inst;
    }

}