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The XSLT and XQuery Processor
////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
// 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.Literal;
import net.sf.saxon.expr.StringLiteral;
import net.sf.saxon.expr.instruct.*;
import net.sf.saxon.lib.StandardURIChecker;
import net.sf.saxon.lib.Validation;
import net.sf.saxon.om.*;
import net.sf.saxon.trans.Err;
import net.sf.saxon.trans.XPathException;
import net.sf.saxon.type.SchemaType;
import net.sf.saxon.value.Whitespace;
/**
* An xsl:element element in the stylesheet.
*/
public class XSLElement extends StyleElement {
/*@Nullable*/ private Expression elementName;
private Expression namespace = null;
private String use;
private StructuredQName[] attributeSets = null;
private int validation;
private SchemaType schemaType = null;
private boolean inheritNamespaces = true;
/**
* 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 a template-body
*
* @return true: yes, it may contain a template-body
*/
@Override
protected boolean mayContainSequenceConstructor() {
return true;
}
@Override
protected void prepareAttributes() {
String nameAtt = null;
String namespaceAtt = null;
String validationAtt = null;
String typeAtt = null;
String inheritAtt = null;
for (AttributeInfo att : attributes()) {
NodeName attName = att.getNodeName();
String value = att.getValue();
String f = attName.getDisplayName();
switch (f) {
case "name":
nameAtt = Whitespace.trim(value);
elementName = makeAttributeValueTemplate(nameAtt, att);
break;
case "namespace":
namespaceAtt = value;
namespace = makeAttributeValueTemplate(namespaceAtt, att);
break;
case "validation":
validationAtt = Whitespace.trim(value);
break;
case "type":
typeAtt = Whitespace.trim(value);
break;
case "inherit-namespaces":
inheritAtt = Whitespace.trim(value);
break;
case "use-attribute-sets":
use = value;
break;
default:
checkUnknownAttribute(attName);
break;
}
}
if (nameAtt == null) {
reportAbsence("name");
} else {
if (elementName instanceof StringLiteral) {
if (!NameChecker.isQName(((StringLiteral) elementName).getGroundedValue().codePoints())) {
compileError("Element name " +
Err.wrap(((StringLiteral) elementName).stringify()) +
" is not a valid QName", "XTDE0820");
// to prevent duplicate error messages:
elementName = new StringLiteral("saxon-error-element");
}
}
}
if (namespaceAtt != null) {
if (namespace instanceof StringLiteral) {
if (!StandardURIChecker.getInstance().isValidURI(((StringLiteral) namespace).stringify())) {
compileError("The value of the namespace attribute must be a valid URI", "XTDE0835");
}
}
}
if (validationAtt != null) {
validation = validateValidationAttribute(validationAtt);
} else {
validation = getDefaultValidation();
}
if (typeAtt != null) {
if (!isSchemaAware()) {
compileError("The @type attribute is available only with a schema-aware XSLT processor", "XTSE1660");
}
schemaType = getSchemaType(typeAtt);
validation = Validation.BY_TYPE;
}
if (typeAtt != null && validationAtt != null) {
compileError("The @validation and @type attributes are mutually exclusive", "XTSE1505");
}
if (inheritAtt != null) {
inheritNamespaces = processBooleanAttribute("inherit-namespaces", inheritAtt);
}
}
@Override
public void validate(ComponentDeclaration decl) throws XPathException {
if (use != null) {
// get the names of referenced attribute sets
attributeSets = getUsedAttributeSets(use);
}
elementName = typeCheck("name", elementName);
namespace = typeCheck("namespace", namespace);
}
@Override
public Expression compile(Compilation exec, ComponentDeclaration decl) throws XPathException {
// deal specially with the case where the element name is known statically
if (elementName instanceof StringLiteral) {
String qName = ((StringLiteral) elementName).stringify();
String[] parts;
try {
parts = NameChecker.getQNameParts(qName);
} catch (QNameException e) {
compileErrorInAttribute("Invalid element name: " + qName, "XTDE0820", "name");
return null;
}
String nsuri = null;
if (namespace instanceof StringLiteral) {
nsuri = ((StringLiteral) namespace).stringify();
if (nsuri.isEmpty()) {
parts[0] = "";
}
} else if (namespace == null) {
nsuri = getURIForPrefix(parts[0], true);
if (nsuri == null) {
undeclaredNamespaceError(parts[0], "XTDE0830", "name");
}
}
if (nsuri != null) {
// Local name and namespace are both known statically: generate a FixedElement instruction
FingerprintedQName qn = new FingerprintedQName(parts[0], nsuri, parts[1]);
qn.obtainFingerprint(getNamePool());
FixedElement FixedElementInst = new FixedElement(qn,
NamespaceMap.emptyMap(),
inheritNamespaces,
true, schemaType,
validation);
FixedElementInst.setLocation(allocateLocation());
return compileContentExpression(exec, decl, FixedElementInst);
}
}
ComputedElement inst = new ComputedElement(elementName,
namespace,
schemaType,
validation,
inheritNamespaces,
false);
inst.setLocation(allocateLocation());
return compileContentExpression(exec, decl, inst);
}
private Expression compileContentExpression(Compilation exec, ComponentDeclaration decl, ElementCreator inst) throws XPathException {
Expression content = compileSequenceConstructor(exec, decl, true);
if (attributeSets != null) {
Expression use = UseAttributeSet.makeUseAttributeSets(attributeSets, this);
if (content == null) {
content = use;
} else {
content = Block.makeBlock(use, content);
content.setLocation(allocateLocation());
}
}
if (content == null) {
content = Literal.makeEmptySequence();
}
inst.setContentExpression(content);
return inst;
}
}