package client.net.sf.saxon.ce.style;
import client.net.sf.saxon.ce.expr.Expression;
import client.net.sf.saxon.ce.expr.Literal;
import client.net.sf.saxon.ce.expr.instruct.Executable;
import client.net.sf.saxon.ce.om.*;
import client.net.sf.saxon.ce.tree.iter.AxisIterator;
import client.net.sf.saxon.ce.expr.sort.SortExpression;
import client.net.sf.saxon.ce.expr.sort.SortKeyDefinition;
import client.net.sf.saxon.ce.trans.XPathException;
import client.net.sf.saxon.ce.type.ItemType;
import client.net.sf.saxon.ce.type.Type;
import client.net.sf.saxon.ce.type.TypeHierarchy;
import client.net.sf.saxon.ce.value.Whitespace;
/**
* Handler for xsl:perform-sort elements in stylesheet (XSLT 2.0). <br>
*/
public class XSLPerformSort extends StyleElement {
Expression select = null;
/**
* Determine whether this node is an instruction.
* @return true - it is an instruction
*/
public boolean isInstruction() {
return true;
}
/**
* Determine the type of item returned by this instruction (only relevant if
* it is an instruction).
* @return the item type returned
*/
protected ItemType getReturnedItemType() {
if (select==null) {
return getCommonChildItemType();
} else {
final TypeHierarchy th = getConfiguration().getTypeHierarchy();
return select.getItemType(th);
}
}
/**
* Determine whether this type of element is allowed to contain a template-body
* @return true: yes, it may contain a template-body
*/
public boolean mayContainSequenceConstructor() {
return true;
}
/**
* Specify that xsl:sort is a permitted child
*/
protected boolean isPermittedChild(StyleElement child) {
return (child instanceof XSLSort);
}
public void prepareAttributes() throws XPathException {
AttributeCollection atts = getAttributeList();
String selectAtt = null;
for (int a=0; a<atts.getLength(); a++) {
int nc = atts.getNameCode(a);
String f = getNamePool().getClarkName(nc);
if (f.equals(StandardNames.SELECT)) {
selectAtt = atts.getValue(a);
} else {
checkUnknownAttribute(nc);
}
}
if (selectAtt!=null) {
select = makeExpression(selectAtt);
}
}
public void validate(Declaration decl) throws XPathException {
checkSortComesFirst(true);
if (select != null) {
// if there is a select attribute, check that there are no children other than xsl:sort and xsl:fallback
AxisIterator kids = iterateAxis(Axis.CHILD);
while (true) {
NodeInfo child = (NodeInfo)kids.next();
if (child == null) {
break;
}
if (child instanceof XSLSort || child instanceof XSLFallback) {
// no action
} else if (child.getNodeKind() == Type.TEXT && !Whitespace.isWhite(child.getStringValueCS())) {
// with xml:space=preserve, white space nodes may still be there
compileError("Within xsl:perform-sort, significant text must not appear if there is a select attribute",
"XTSE1040");
} else {
((StyleElement)child).compileError(
"Within xsl:perform-sort, child instructions are not allowed if there is a select attribute",
"XTSE1040");
}
}
}
select = typeCheck(select);
}
public Expression compile(Executable exec, Declaration decl) throws XPathException {
SortKeyDefinition[] sortKeys = makeSortKeys(decl);
if (select != null) {
return new SortExpression(select, sortKeys);
} else {
Expression body = compileSequenceConstructor(exec, decl, iterateAxis(Axis.CHILD));
if (body == null) {
body = Literal.makeEmptySequence();
}
try {
return new SortExpression(makeExpressionVisitor().simplify(body), sortKeys);
} catch (XPathException e) {
compileError(e);
return null;
}
}
}
}
// 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.