net.sf.saxon.style.XSLValueOf Maven / Gradle / Ivy

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////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2018-2023 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.Configuration;
import net.sf.saxon.expr.Expression;
import net.sf.saxon.expr.StringLiteral;
import net.sf.saxon.expr.instruct.ValueOf;
import net.sf.saxon.om.AttributeInfo;
import net.sf.saxon.om.NodeName;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.TypeHierarchy;
import net.sf.saxon.value.StringValue;
import net.sf.saxon.value.Whitespace;


/**
 * An xsl:value-of element in the stylesheet. 

 * The xsl:value-of element takes attributes:
 * a mandatory attribute select="expression".
 * This must be a valid String expression
 * an optional disable-output-escaping attribute, value "yes" or "no"
 * an optional separator attribute
 * 
 */

public final class XSLValueOf extends XSLLeafNodeConstructor {

    private boolean disable = false;
    /*@Nullable*/ private Expression separator;


    @Override
    protected void prepareAttributes() {

        String selectAtt = null;
        String disableAtt = null;
        String separatorAtt = null;

        for (AttributeInfo att : attributes()) {
            NodeName attName = att.getNodeName();
            String f = attName.getDisplayName();
            String value = att.getValue();
            switch (f) {
                case "disable-output-escaping":
                    disableAtt = Whitespace.trim(value);
                    break;
                case "select":
                    selectAtt = value;
                    select = makeExpression(selectAtt, att);
                    break;
                case "separator":
                    separatorAtt = value;
                    separator = makeAttributeValueTemplate(separatorAtt, att);
                    break;
                default:
                    checkUnknownAttribute(attName);
                    break;
            }
        }

        if (disableAtt != null) {
            disable = processBooleanAttribute("disable-output-escaping", disableAtt);
        }
    }

    @Override
    public void validate(ComponentDeclaration decl) throws XPathException {
        super.validate(decl);
        select = typeCheck("select", select);
        separator = typeCheck("separator", separator);
    }

    /**
     * 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
     */

    @Override
    protected String getErrorCodeForSelectPlusContent() {
        return "XTSE0870";
    }

    @Override
    public Expression compile(Compilation exec, ComponentDeclaration decl) throws XPathException {
        Configuration config = getConfiguration();
        final TypeHierarchy th = config.getTypeHierarchy();
        if (separator == null && select != null && xPath10ModeIsEnabled()) {
            // Handle XSLT 1.0 backwards compatibility
            select = config.getTypeChecker(true).processValueOf(select, config);
        } else {
            if (separator == null) {
                if (select == null) {
                    separator = new StringLiteral(StringValue.EMPTY_STRING);
                } else {
                    separator = new StringLiteral(StringValue.SINGLE_SPACE);
                }
            }
        }
        ValueOf inst = new ValueOf(select, disable, false);
        inst.setRetainedStaticContext(makeRetainedStaticContext());
        compileContent(exec, decl, inst, separator);
        return inst.withLocation(saveLocation());
    }

}