com.xmlcalabash.extensions.Eval Maven / Gradle / Ivy
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package com.xmlcalabash.extensions;
import com.xmlcalabash.core.XMLCalabash;
import com.xmlcalabash.library.DefaultStep;
import com.xmlcalabash.io.ReadablePipe;
import com.xmlcalabash.io.WritablePipe;
import com.xmlcalabash.core.XProcRuntime;
import com.xmlcalabash.core.XProcException;
import com.xmlcalabash.core.XProcConstants;
import com.xmlcalabash.runtime.XAtomicStep;
import com.xmlcalabash.runtime.XPipeline;
import com.xmlcalabash.runtime.XInput;
import com.xmlcalabash.runtime.XLibrary;
import com.xmlcalabash.model.RuntimeValue;
import com.xmlcalabash.model.Input;
import com.xmlcalabash.model.DeclareStep;
import com.xmlcalabash.util.AxisNodes;
import com.xmlcalabash.util.S9apiUtils;
import com.xmlcalabash.util.TreeWriter;
import net.sf.saxon.s9api.QName;
import net.sf.saxon.s9api.SaxonApiException;
import net.sf.saxon.s9api.XdmNode;
import net.sf.saxon.s9api.XdmDestination;
import net.sf.saxon.s9api.XdmNodeKind;
import net.sf.saxon.s9api.XdmSequenceIterator;
import net.sf.saxon.s9api.Axis;
import net.sf.saxon.s9api.XdmValue;
import java.util.Hashtable;
import java.util.Vector;
import java.util.Set;
import java.util.Iterator;
/**
* Created by IntelliJ IDEA.
* User: ndw
* Date: Mar 15, 2009
* Time: 5:22:42 PM
* To change this template use File | Settings | File Templates.
*/
@XMLCalabash(
name = "cx:eval",
type = "{http://xmlcalabash.com/ns/extensions}eval")
public class Eval extends DefaultStep {
protected final static QName cx_document = new QName("cx", XProcConstants.NS_CALABASH_EX, "document");
protected final static QName cx_options = new QName("cx", XProcConstants.NS_CALABASH_EX, "options");
protected final static QName cx_option = new QName("cx", XProcConstants.NS_CALABASH_EX, "option");
private static final QName _port = new QName("port");
private static final QName _detailed = new QName("detailed");
private static final QName _step = new QName("step");
private static final QName _name = new QName("name");
private static final QName _value = new QName("value");
private Vector sources = new Vector ();
private ReadablePipe pipeline = null;
private Hashtable params = new Hashtable ();
private Vector options = new Vector ();
private WritablePipe result = null;
/*
* Creates a new instance of Eval
*/
public Eval(XProcRuntime runtime, XAtomicStep step) {
super(runtime,step);
}
public void setInput(String port, ReadablePipe pipe) {
if ("source".equals(port)) {
sources.add(pipe);
} else if ("pipeline".equals(port)) {
if (pipeline != null) {
throw new XProcException(step, "You can't specify more than one pipeline.");
} else {
pipeline = pipe;
}
} else if ("options".equals(port)) {
options.add(pipe);
} else {
throw new XProcException(step, "Unexpected port: " + port);
}
}
public void setOutput(String port, WritablePipe pipe) {
result = pipe;
}
public void reset() {
for (ReadablePipe pipe : sources) {
pipe.resetReader();
}
for (ReadablePipe pipe : options) {
pipe.resetReader();
}
pipeline.resetReader();
// What about parameters?
result.resetWriter();
}
public void setParameter(QName name, RuntimeValue value) {
params.put(name, value);
}
public void run() throws SaxonApiException {
super.run();
XdmNode pipedoc = pipeline.read();
XdmNode piperoot = S9apiUtils.getDocumentElement(pipedoc);
XProcRuntime innerRuntime = new XProcRuntime(runtime);
XPipeline pipeline = null;
try {
QName stepName = getOption(_step, (QName) null);
if (XProcConstants.p_pipeline.equals(piperoot.getNodeName())
|| XProcConstants.p_declare_step.equals(piperoot.getNodeName())) {
if (stepName != null) {
throw new XProcException(step, "Step option can only be used when loading a p:library");
}
pipeline = innerRuntime.use(pipedoc);
} else if (XProcConstants.p_library.equals(piperoot.getNodeName())) {
XLibrary library = innerRuntime.useLibrary(piperoot);
if (stepName == null) {
pipeline = library.getFirstPipeline();
} else {
pipeline = library.getPipeline(stepName);
}
}
Set inputports = pipeline.getInputs();
Set outputports = pipeline.getOutputs();
int inputCount = 0;
for (String port : inputports) {
XInput input = pipeline.getInput(port);
if (input.getParameters()) {
// nop; it's ok for these to be unbound
} else {
inputCount++;
}
}
boolean detailed = getOption(_detailed, false);
if (!detailed && (inputCount > 1 || outputports.size() > 1)) {
throw new XProcException(
step, "You must specify detailed='true' to eval pipelines with multiple inputs or outputs");
}
DeclareStep decl = pipeline.getDeclareStep();
String primaryin = null;
Iterator portiter = inputports.iterator();
while (portiter.hasNext()) {
String port = portiter.next();
Input input = decl.getInput(port);
if (!input.getParameterInput() && ((inputports.size() == 1 && !input.getPrimarySet()) || input.getPrimary())) {
primaryin = port;
}
}
Hashtable> inputs = new Hashtable>();
for (ReadablePipe pipe : sources) {
while (pipe.moreDocuments()) {
String port = primaryin;
XdmNode doc = pipe.read();
XdmNode root = S9apiUtils.getDocumentElement(doc);
if (detailed && cx_document.equals(root.getNodeName())) {
port = root.getAttributeValue(_port);
// FIXME: support exclude-inline-prefixes
boolean seenelem = false;
XdmDestination dest = new XdmDestination();
Vector nodes = new Vector();
XdmSequenceIterator iter = root.axisIterator(Axis.CHILD);
while (iter.hasNext()) {
XdmNode child = (XdmNode) iter.next();
if (child.getNodeKind() == XdmNodeKind.ELEMENT) {
if (seenelem) {
throw new IllegalArgumentException("Not a well-formed inline document");
}
seenelem = true;
}
nodes.add(child);
}
S9apiUtils.writeXdmValue(runtime, nodes, dest, root.getBaseURI());
doc = dest.getXdmNode();
}
if (port == null) {
throw new XProcException(step, "You must use cx:document for pipelines with no primary input port");
}
if (!inputs.containsKey(port)) {
inputs.put(port, new Vector());
}
inputs.get(port).add(doc);
}
}
for (String port : inputs.keySet()) {
if (inputports.contains(port)) {
pipeline.clearInputs(port);
for (XdmNode node : inputs.get(port)) {
pipeline.writeTo(port, node);
}
} else {
throw new XProcException(step, "Eval pipeline has no input port named '" + port + "'");
}
}
if (params != null) {
for (QName name : params.keySet()) {
pipeline.setParameter(name, params.get(name));
}
}
for (ReadablePipe pipe : options) {
while (pipe.moreDocuments()) {
XdmNode doc = pipe.read();
XdmNode root = S9apiUtils.getDocumentElement(doc);
if (!cx_options.equals(root.getNodeName())) {
throw new XProcException(step, "Options port must be a cx:options document.");
}
for (XdmNode opt : new AxisNodes(runtime, root, Axis.CHILD, AxisNodes.SIGNIFICANT)) {
if (opt.getNodeKind() != XdmNodeKind.ELEMENT || !cx_option.equals(opt.getNodeName())) {
throw new XProcException(step, "A cx:options document must only contain cx:option elements");
}
String name = opt.getAttributeValue(_name);
QName qname = new QName(name, opt);
String value = opt.getAttributeValue(_value);
if ((name == null) || (value == null)) {
throw new XProcException(step, "A cx:option element must have name and value attributes");
}
RuntimeValue runtimeValue = new RuntimeValue(value);
pipeline.passOption(qname, runtimeValue);
}
}
}
pipeline.run();
portiter = outputports.iterator();
while (portiter.hasNext()) {
String port = portiter.next();
ReadablePipe rpipe = pipeline.readFrom(port);
rpipe.canReadSequence(true);
while (rpipe.moreDocuments()) {
XdmNode doc = rpipe.read();
TreeWriter tree = new TreeWriter(runtime);
tree.startDocument(doc.getBaseURI());
if (detailed) {
tree.addStartElement(cx_document);
tree.addAttribute(_port, port);
tree.startContent();
tree.addSubtree(doc);
tree.addEndElement();
} else {
tree.addSubtree(doc);
}
tree.endDocument();
result.write(tree.getResult());
}
}
} catch (XProcException e) {
throw e.rebase(step.getLocation());
} finally {
if (pipeline != null) {
for (XdmNode doc : pipeline.errors()) {
step.reportError(doc);
}
}
innerRuntime.close();
runtime.resetExtensionFunctions();
}
}
}