package org.pdf4j.saxon.style;
import org.pdf4j.saxon.expr.BreakInstr;
import org.pdf4j.saxon.expr.Expression;
import org.pdf4j.saxon.instruct.Executable;
import org.pdf4j.saxon.om.AttributeCollection;
import org.pdf4j.saxon.om.Axis;
import org.pdf4j.saxon.om.AxisIterator;
import org.pdf4j.saxon.om.NodeInfo;
import org.pdf4j.saxon.trans.Err;
import org.pdf4j.saxon.trans.XPathException;
import org.pdf4j.saxon.type.AnyItemType;
import org.pdf4j.saxon.type.ItemType;
import org.pdf4j.saxon.type.Type;
import org.pdf4j.saxon.value.Whitespace;
/**
* A saxon:break element in the stylesheet, or (by subclassing) a saxon:continue element
*/
public class SaxonBreak extends StyleElement {
SaxonIterate saxonIterate = 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() {
return AnyItemType.getInstance();
}
public void prepareAttributes() throws XPathException {
AttributeCollection atts = getAttributeList();
for (int a=0; a<atts.getLength(); a++) {
int nc = atts.getNameCode(a);
checkUnknownAttribute(nc);
}
}
public void validate() throws XPathException {
validatePosition();
if (saxonIterate == null) {
compileError(getDisplayName() + " must be a descendant of a saxon:iterate instruction", "XTSE0010");
return;
}
AxisIterator kids = iterateAxis(Axis.CHILD);
while (true) {
NodeInfo child = (NodeInfo)kids.next();
if (child == null) {
break;
}
if (child instanceof XSLFallback && mayContainFallback()) {
// xsl:fallback is not allowed on xsl:call-template, but is allowed on saxon:call-template (cheat!)
} else if (child.getNodeKind() == Type.TEXT) {
// with xml:space=preserve, white space nodes may still be there
if (!Whitespace.isWhite(child.getStringValueCS())) {
compileError("No character data is allowed within " + getDisplayName(), "XTSE0010");
}
} else {
compileError("Child element " + Err.wrap(child.getDisplayName(), Err.ELEMENT) +
" is not allowed within " + getDisplayName(), "XTSE0010");
}
}
}
/**
* Test that this saxon:continue or saxon:break instruction appears in a valid position
* @throws XPathException
*/
protected void validatePosition() throws XPathException {
NodeInfo inst = this;
boolean isLast = true;
while (true) {
if (!(inst instanceof XSLWhen)) {
AxisIterator sibs = inst.iterateAxis(Axis.FOLLOWING_SIBLING);
while (true) {
NodeInfo sib = (NodeInfo)sibs.next();
if (sib == null) {
break;
}
if (sib instanceof XSLFallback || sib instanceof SaxonFinally) {
continue;
}
isLast = false;
}
}
inst = inst.getParent();
if (inst instanceof SaxonIterate) {
saxonIterate = (SaxonIterate)inst;
break;
} else if (inst instanceof XSLWhen || inst instanceof XSLOtherwise
|| inst instanceof XSLIf || inst instanceof XSLChoose) {
// continue;
} else if (inst == null) {
compileError(getDisplayName() + " is not allowed at outermost level", "XTSE0010");
return;
} else {
compileError(getDisplayName() + " is not allowed within " + inst.getDisplayName(), "XTSE0010");
return;
}
}
if (!isLast) {
compileError(getDisplayName() + " must be the last instruction in the saxon:iterate loop", "XTSE0010");
}
}
public Expression compile(Executable exec) throws XPathException {
return new BreakInstr ();
}
}
//
// The contents of this file are subject to the Mozilla Public License Version 1.0 (the "License");
// you may not use this file except in compliance with the License. You may obtain a copy of the
// License at http://www.mozilla.org/MPL/
//
// Software distributed under the License is distributed on an "AS IS" basis,
// WITHOUT WARRANTY OF ANY KIND, either express or implied.
// See the License for the specific language governing rights and limitations under the License.
//
// The Original Code is: all this file
//
// The Initial Developer of the Original Code is Michael H. Kay.
//
// Contributor(s):
//