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package org.uscxml.datamodel.ecmascript;
import java.lang.reflect.Method;
import java.util.Map;
import org.mozilla.javascript.Callable;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.EvaluatorException;
import org.mozilla.javascript.FunctionObject;
import org.mozilla.javascript.NativeJSON;
import org.mozilla.javascript.Scriptable;
import org.mozilla.javascript.ScriptableObject;
import org.mozilla.javascript.Undefined;
import org.uscxml.Data;
import org.uscxml.DataModel;
import org.uscxml.Event;
import org.uscxml.Interpreter;
import org.uscxml.NativeIOProcessor;
import org.uscxml.NativeInvoker;
import org.uscxml.StringList;
public class ECMAScriptDataModel extends DataModel {
public static boolean debug = true;
private class NullCallable implements Callable {
@Override
public Object call(Context context, Scriptable scope,
Scriptable holdable, Object[] objects) {
return objects[1];
}
}
public Context ctx;
public Scriptable scope;
public Interpreter interpreter;
public Data getScriptableAsData(Object object) {
Data data = new Data();
Scriptable s;
try {
s = (Scriptable) object;
String className = s.getClassName(); // ECMA class name
if (className.toLowerCase().equals("object")) {
ScriptableObject obj = (ScriptableObject) Context.toObject(s,
scope);
for (Object key : obj.getIds()) {
data.put(Context.toString(key),
getScriptableAsData(obj.get(key)));
}
}
} catch (ClassCastException e) {
if (object instanceof Boolean) {
data.setAtom(Context.toBoolean(object) ? "true" : "false");
data.setType(Data.Type.INTERPRETED);
} else if (object instanceof String) {
data.setAtom((String) object);
data.setType(Data.Type.VERBATIM);
} else if (object instanceof Integer) {
data.setAtom(((Integer) object).toString());
data.setType(Data.Type.INTERPRETED);
} else {
throw new RuntimeException("Unhandled ECMA type "
+ object.getClass().getName());
}
}
return data;
}
public ScriptableObject getDataAsScriptable(Data data) {
throw new UnsupportedOperationException("Not implemented");
}
public static boolean jsIn(String stateName) {
return true;
}
@Override
public DataModel create(Interpreter interpreter) {
/**
* Called when an SCXML interpreter wants an instance of this datamodel
* Be careful to instantiate attributes of instance returned and not
* *this*
*/
ECMAScriptDataModel newDM = new ECMAScriptDataModel();
newDM.swigReleaseOwnership();
newDM.interpreter = interpreter;
newDM.ctx = Context.enter();
try {
newDM.scope = newDM.ctx.initStandardObjects();
} catch (Exception e) {
System.err.println(e);
}
newDM.scope.put("_name", newDM.scope, interpreter.getName());
newDM.scope.put("_sessionid", newDM.scope, interpreter.getSessionId());
// ioProcessors
{
Data ioProcs = new Data();
Map<String, NativeIOProcessor> ioProcNatives = interpreter.getIOProcessors();
for (String key : ioProcNatives.keySet()) {
ioProcs.put(key, ioProcNatives.get(key).getDataModelVariables());
}
newDM.scope
.put("_ioprocessors", newDM.scope, new ECMAData(ioProcs));
}
// invokers
{
Data invokers = new Data();
Map<String, NativeInvoker> invokersNatives = interpreter.getInvokers();
for (String key : invokersNatives.keySet()) {
invokers.put(key, invokersNatives.get(key).getDataModelVariables());
}
newDM.scope
.put("_invokers", newDM.scope, new ECMAData(invokers));
}
// In predicate (not working as static is required) see:
// http://stackoverflow.com/questions/3441947/how-do-i-call-a-method-of-a-java-instance-from-javascript/16479685#16479685
try {
Class[] parameters = new Class[] { String.class };
Method inMethod = ECMAScriptDataModel.class.getMethod("jsIn",
parameters);
FunctionObject inFunc = new FunctionObject("In", inMethod,
newDM.scope);
newDM.scope.put("In", newDM.scope, inFunc);
} catch (SecurityException e) {
System.err.println(e);
} catch (NoSuchMethodException e) {
System.err.println(e);
}
return newDM;
}
@Override
public StringList getNames() {
/**
* Register with the following names for the datamodel attribute at the
* scxml element. <scxml datamodel="one of these">
*/
StringList ss = new StringList();
ss.add("ecmascript");
return ss;
}
@Override
public boolean validate(String location, String schema) {
/**
* Validate the datamodel. This make more sense for XML datamodels and
* is pretty much unused but required as per draft.
*/
return true;
}
@Override
public void setEvent(Event event) {
if (debug) {
System.out.println(interpreter.getName() + " setEvent");
}
/**
* Make the current event available as the variable _event in the
* datamodel.
*/
ECMAEvent ecmaEvent = new ECMAEvent(event);
scope.put("_event", scope, ecmaEvent);
}
@Override
public Data getStringAsData(String content) {
if (debug) {
System.out.println(interpreter.getName() + " getStringAsData");
}
/**
* Evaluate the string as a value expression and transform it into a
* JSON-like Data structure
*/
if (content.length() == 0) {
return new Data();
}
// is it a json expression?
try {
Object json = NativeJSON.parse(ctx, scope, content,
new NullCallable());
if (json != NativeJSON.NOT_FOUND) {
return getScriptableAsData(json);
}
} catch (org.mozilla.javascript.EcmaError e) {
System.err.println(e);
}
// is it a function call or variable?
Object x = ctx.evaluateString(scope, content, "uscxml", 0, null);
if (x == Undefined.instance) {
// maybe a literal string?
x = ctx.evaluateString(scope, '"' + content + '"', "uscxml", 0,
null);
}
return getScriptableAsData(x);
}
@Override
public long getLength(String expr) {
if (debug) {
System.out.println(interpreter.getName() + " getLength");
}
/**
* Return the length of the expression if it were an array, used by
* foreach element.
*/
Object x = scope.get(expr, scope);
if (x == Undefined.instance) {
return 0;
}
Scriptable result = Context.toObject(x, scope);
if (result.has("length", result)) {
return (long) Context.toNumber(result.get("length", result));
}
return 0;
}
@Override
public void setForeach(String item, String array, String index,
long iteration) {
if (debug) {
System.out.println(interpreter.getName() + " setForeach");
}
/**
* Prepare an iteration of the foreach element, by setting the variable
* in index to the current iteration and setting the variable in item to
* the current item from array.
*/
try {
// get the array object
Scriptable arr = (Scriptable) scope.get(array, scope);
if (arr.has((int) iteration, arr)) {
ctx.evaluateString(scope, item + '=' + array + '[' + iteration
+ ']', "uscxml", 1, null);
if (index.length() > 0) {
ctx.evaluateString(scope, index + '=' + iteration,
"uscxml", 1, null);
}
} else {
handleException("");
}
} catch (ClassCastException e) {
System.err.println(e);
}
}
@Override
public void eval(String scriptElem, String expr) {
if (debug) {
System.out.println(interpreter.getName() + " eval");
}
/**
* Evaluate the given expression in the datamodel. This is used foremost
* with script elements.
*/
ctx.evaluateString(scope, expr, "uscxml", 1, null);
}
@Override
public String evalAsString(String expr) {
if (debug) {
System.out.println(interpreter.getName() + " evalAsString: " + expr);
}
/**
* Evaluate the expression as a string e.g. for the log element.
*/
if (!ctx.stringIsCompilableUnit(expr)) {
handleException("");
return "";
}
try {
Object result = ctx.evaluateString(scope, expr, "uscxml", 1, null);
return Context.toString(result);
} catch (IllegalStateException e) {
System.err.println(e);
handleException("");
} catch (EvaluatorException e) {
System.err.println(e);
handleException("");
}
return "";
}
@Override
public boolean evalAsBool(String elem, String expr) {
if (debug) {
System.out.println(interpreter.getName() + " evalAsBool");
}
/**
* Evaluate the expression as a boolean for cond attributes in if and
* transition elements.
*/
Object result = ctx.evaluateString(scope, expr, "uscxml", 1, null);
return Context.toBoolean(result);
}
@Override
public boolean isDeclared(String expr) {
if (debug) {
System.out.println(interpreter.getName() + " isDeclared");
}
/**
* The interpreter is supposed to raise an error if we assign to an
* undeclared variable. This method is used to check whether a location
* from assign is declared.
*/
Object x = scope.get(expr, scope);
return x != Scriptable.NOT_FOUND;
}
@Override
public void init(String dataElem, String location, String content) {
if (debug) {
System.out.println(interpreter.getName() + " init");
}
/**
* Called when we pass data elements.
*/
if (("null").equals(location))
return;
if (("null").equals(content) || content.length() == 0) {
scope.put(location, scope, Context.getUndefinedValue());
return;
}
try {
Object json = NativeJSON.parse(ctx, scope, content,
new NullCallable());
if (json != NativeJSON.NOT_FOUND) {
scope.put(location, scope, json);
} else {
scope.put(location, scope, content);
}
} catch (org.mozilla.javascript.EcmaError e) {
scope.put(location, scope, content);
}
}
@Override
public void assign(String assignElem, String location, String content) {
if (debug) {
System.out.println(interpreter.getName() + " assign");
}
/**
* Called when we evaluate assign elements
*/
if (("null").equals(location))
return;
if (("null").equals(content) || content.length() == 0) {
scope.put(location, scope, Context.getUndefinedValue());
return;
}
String expr = location + "=" + content;
ctx.evaluateString(scope, expr, "uscxml", 1, null);
}
public void handleException(String cause) {
Event exceptionEvent = new Event();
exceptionEvent.setName("error.execution");
exceptionEvent.setEventType(Event.Type.PLATFORM);
interpreter.receiveInternal(exceptionEvent);
}
}
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