505 lines
19 KiB
Java
505 lines
19 KiB
Java
|
// JSRWrapper.java
|
||
|
|
// FESI Copyright (c) Jean-Marc Lugrin, 1999
|
||
|
|
//
|
||
|
|
// This program is free software; you can redistribute it and/or
|
||
|
|
// modify it under the terms of the GNU Lesser General Public
|
||
|
|
// License as published by the Free Software Foundation; either
|
||
|
|
// version 2 of the License, or (at your option) any later version.
|
||
|
|
|
||
|
|
// This program is distributed in the hope that it will be useful,
|
||
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
|
|
// Lesser General Public License for more details.
|
||
|
|
|
||
|
|
// You should have received a copy of the GNU Lesser General Public
|
||
|
|
// License along with this library; if not, write to the Free Software
|
||
|
|
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
||
|
|
|
||
|
|
package FESI.Data;
|
||
|
|
|
||
|
|
import FESI.jslib.*;
|
||
|
|
import FESI.Exceptions.*;
|
||
|
|
import FESI.Extensions.Extension;
|
||
|
|
import FESI.Interpreter.Evaluator;
|
||
|
|
import FESI.Interpreter.UserEvaluationSource;
|
||
|
|
|
||
|
|
import java.io.Reader;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Package an EcmaScript object as a JSObject for use by the
|
||
|
|
* Netscape like interface.
|
||
|
|
*/
|
||
|
|
public class JSWrapper implements JSObject {
|
||
|
|
|
||
|
|
protected Evaluator evaluator;
|
||
|
|
protected ESObject object;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Create a JSWraper for an EcmaScript object
|
||
|
|
* @param object the EcmaScript object
|
||
|
|
* @param evaluator theEvaluator
|
||
|
|
*/
|
||
|
|
public JSWrapper(ESObject object, Evaluator evaluator) {
|
||
|
|
super();
|
||
|
|
this.object = object;
|
||
|
|
this.evaluator = evaluator;
|
||
|
|
}
|
||
|
|
|
||
|
|
// overrides
|
||
|
|
public ESObject getESObject() {
|
||
|
|
return object;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Return the global object attached to this object
|
||
|
|
* @return the global object
|
||
|
|
*/
|
||
|
|
public JSGlobalObject getGlobalObject() {
|
||
|
|
return new JSGlobalWrapper(evaluator.getGlobalObject(), evaluator);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implements the call the specified EcmaScript method of this object
|
||
|
|
*
|
||
|
|
* @param methodName The name of the method to call
|
||
|
|
* @param args An array of parameters.
|
||
|
|
* @return The result of the evaluation
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object call(String methodName,Object args[]) throws JSException {
|
||
|
|
Object obj = null;
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
ESValue function = object.getProperty(methodName, methodName.hashCode());
|
||
|
|
ESValue[] esargs = null;
|
||
|
|
if (args == null) {
|
||
|
|
esargs = new ESValue[0];
|
||
|
|
} else {
|
||
|
|
esargs = new ESValue[args.length];
|
||
|
|
for (int i=0; i<args.length; i++) {
|
||
|
|
esargs[i] = ESLoader.normalizeValue(args[i], evaluator);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
ESValue value = function.callFunction(object, esargs); // should never return null
|
||
|
|
obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implements the evaluation of a string with this object as the 'this' object.
|
||
|
|
* The string is considered a main program (top level return is not allowed)
|
||
|
|
*
|
||
|
|
* @param s The string to evaluate
|
||
|
|
* @return The result of the evaluation (null if no value returned)
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object eval(String s) throws JSException {
|
||
|
|
Object obj = null;
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
ESValue value = evaluator.evaluate(s, object, false); // Can return null !
|
||
|
|
if (value != null) obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Evaluate a Reader stream with this object as the 'this' object.
|
||
|
|
* Consider the stream being a main program, not allowing the
|
||
|
|
* return statement.
|
||
|
|
*
|
||
|
|
* @param r The Reader stream to evaluate
|
||
|
|
* @param d A description of the Reader for error messages
|
||
|
|
* @return The result of the evaluation (null if no value returned)
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object eval(Reader r, String d) throws JSException {
|
||
|
|
Object obj = null;
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
UserEvaluationSource ses;
|
||
|
|
if (d==null) {
|
||
|
|
ses = new UserEvaluationSource("<Anonymous stream>", null);
|
||
|
|
} else {
|
||
|
|
ses = new UserEvaluationSource(d, null);
|
||
|
|
}
|
||
|
|
ESValue value =
|
||
|
|
evaluator.evaluate(r,
|
||
|
|
object,
|
||
|
|
ses,
|
||
|
|
false);
|
||
|
|
if (value != null) obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Evaluate a Reader stream with this object as the 'this' object.
|
||
|
|
* Consider the stream being a function program, allowing the
|
||
|
|
* return statement.
|
||
|
|
*
|
||
|
|
* @param r The Reader stream to evaluate
|
||
|
|
* @param d A description of the Reader for error messages
|
||
|
|
* @return The result of the evaluation (null if no value returned)
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object evalAsFunction(Reader r, String d) throws JSException {
|
||
|
|
Object obj = null;
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
UserEvaluationSource ses;
|
||
|
|
if (d==null) {
|
||
|
|
ses = new UserEvaluationSource("<Anonymous stream>", null);
|
||
|
|
} else {
|
||
|
|
ses = new UserEvaluationSource(d, null);
|
||
|
|
}
|
||
|
|
ESValue value =
|
||
|
|
evaluator.evaluate(r,
|
||
|
|
object,
|
||
|
|
ses,
|
||
|
|
true);
|
||
|
|
if (value != null) obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implements the evaluation of a string with this object as the 'this' object.
|
||
|
|
* The string is considered a function (top level return are allowed)
|
||
|
|
* Passing the specified parameters (names and values must have the same length)
|
||
|
|
*
|
||
|
|
* @param s The string to evaluate
|
||
|
|
* @return The result of the evaluation (null if no value returned)
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object evalAsFunction(String s) throws JSException {
|
||
|
|
|
||
|
|
Object obj = null;
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
ESValue value = evaluator.evaluate(s, object, true); // Can return null !
|
||
|
|
if (value != null) obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
/*
|
||
|
|
// This work but is less efficient
|
||
|
|
evalAsFunction(s, null, null);
|
||
|
|
*/
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Evaluate a Reader stream with this object as the 'this' object.
|
||
|
|
* Consider the stream being a function program, allowing the
|
||
|
|
* return statement.
|
||
|
|
* Passing the specified parameters (names and values must have the same length)
|
||
|
|
*
|
||
|
|
* @param r The Reader stream to evaluate
|
||
|
|
* @param d A description of the Reader for error messages
|
||
|
|
* @param names the names of the parameters
|
||
|
|
* @param values the values of the parameters
|
||
|
|
* @return The result of the evaluation (null if no value returned)
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object evalAsFunction(Reader r, String d, String [] names, Object values[]) throws JSException {
|
||
|
|
Object obj = null;
|
||
|
|
throw new ProgrammingError("NOT IMPLEMENTED");
|
||
|
|
/*
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
UserEvaluationSource ses;
|
||
|
|
if (d==null) {
|
||
|
|
ses = new UserEvaluationSource("<Anonymous stream>", null);
|
||
|
|
} else {
|
||
|
|
ses = new UserEvaluationSource(d, null);
|
||
|
|
}
|
||
|
|
ESValue value =
|
||
|
|
evaluator.evaluate(r,
|
||
|
|
object,
|
||
|
|
ses,
|
||
|
|
true);
|
||
|
|
if (value != null) obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
*/
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implements the evaluation of a string with this object as the 'this' object.
|
||
|
|
* The string is considered a function (top level return are allowed)
|
||
|
|
*
|
||
|
|
* @param body The string to evaluate
|
||
|
|
* @param names the names of the parameters
|
||
|
|
* @param values the values of the parameters
|
||
|
|
* @return The result of the evaluation (null if no value returned)
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object evalAsFunction(String body, String [] names, Object values[]) throws JSException {
|
||
|
|
Object obj = null;
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
// Create function
|
||
|
|
int argLength = (names==null ? 0 : names.length);
|
||
|
|
int checkLength = (values==null ? 0 : names.length);
|
||
|
|
if (argLength!=checkLength) {
|
||
|
|
throw new JSException("argument names and values arrays must have the same length, now: " +
|
||
|
|
argLength + ", " + checkLength);
|
||
|
|
}
|
||
|
|
ESValue esArgs[] = new ESValue[argLength+1]; // space for body
|
||
|
|
for (int i=0; i<argLength; i++) {
|
||
|
|
esArgs[i] = new ESString(names[i]);
|
||
|
|
}
|
||
|
|
esArgs[argLength] = new ESString(body); // body is the last value
|
||
|
|
ESObject fo = evaluator.getFunctionObject();
|
||
|
|
ESObject theFunction = fo.doConstruct(null, esArgs);
|
||
|
|
// Now call function
|
||
|
|
esArgs = new ESValue[argLength]; // just what is needed
|
||
|
|
for (int i=0; i<argLength; i++) {
|
||
|
|
esArgs[i] = ESLoader.normalizeValue(values[i], this.evaluator);
|
||
|
|
}
|
||
|
|
ESValue value = theFunction.callFunction(object, esArgs);
|
||
|
|
if (value != null) obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implements the get named property of this object.
|
||
|
|
*
|
||
|
|
* @param name The name of the property to get
|
||
|
|
* @return The value of the property
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object getMember(String name) throws JSException {
|
||
|
|
Object obj = null;
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
ESValue value = object.getProperty(name, name.hashCode());
|
||
|
|
obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implement the get indexed property of this object (useful for arrays).
|
||
|
|
*
|
||
|
|
* @param index The index value of the property (converted
|
||
|
|
* to string if not an array)
|
||
|
|
* @return The value of the property
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public Object getSlot(int index) throws JSException {
|
||
|
|
Object obj = null;
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
ESValue value = object.getProperty(index);
|
||
|
|
obj = value.toJavaObject();
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return obj;
|
||
|
|
}
|
||
|
|
|
||
|
|
// This Netscape function is not implemented
|
||
|
|
// public static JSObject getWindow(Applet applet) throws JSException;
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implement the deletion of a named property of this object
|
||
|
|
*
|
||
|
|
* @param name The name of the property to delete
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public void removeMember(String name) throws JSException {
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
object.deleteProperty(name, name.hashCode());
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implements the set value of a named property of this object
|
||
|
|
*
|
||
|
|
* @param name The name of the property to set
|
||
|
|
* @param value The value to set the property to.
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public void setMember(String name, Object value) throws JSException {
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
ESValue esvalue = ESLoader.normalizeValue(value, evaluator);
|
||
|
|
object.putProperty(name, esvalue, name.hashCode());
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implement the set property by index value. Useful for arrays.
|
||
|
|
*
|
||
|
|
* @param index The index of the property in the array.
|
||
|
|
* @param value The value to set the property to.
|
||
|
|
* @exception JSException For any error during interpretation
|
||
|
|
*/
|
||
|
|
public void setSlot(int index, Object value) throws JSException {
|
||
|
|
synchronized (evaluator) {
|
||
|
|
try {
|
||
|
|
ESValue esvalue = ESLoader.normalizeValue(value, evaluator);
|
||
|
|
object.putProperty(index, esvalue);
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implement the creation of a new evaluator, with no extension loaded.
|
||
|
|
*
|
||
|
|
* @return The global object of the created evaluator.
|
||
|
|
* @exception JSException For any error during initialization
|
||
|
|
*/
|
||
|
|
static public JSGlobalObject makeEvaluator() throws JSException {
|
||
|
|
Evaluator evaluator = new Evaluator();
|
||
|
|
GlobalObject go = evaluator.getGlobalObject();
|
||
|
|
return new JSGlobalWrapper(go,evaluator);
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Implement the creation of a new evaluator, with specfied extensions loaded.
|
||
|
|
*
|
||
|
|
* @param extensions The class name of the extensions to load.
|
||
|
|
* @return The global object of the created evaluator.
|
||
|
|
* @exception JSException For any error during initialization
|
||
|
|
*/
|
||
|
|
static public JSGlobalObject makeEvaluator(String [] extensions) throws JSException {
|
||
|
|
Evaluator evaluator = new Evaluator();
|
||
|
|
GlobalObject go = evaluator.getGlobalObject();
|
||
|
|
try {
|
||
|
|
if (extensions != null) {
|
||
|
|
for (int i =0; i<extensions.length; i++) {
|
||
|
|
Object e = evaluator.addMandatoryExtension(extensions[i]);
|
||
|
|
if (e==null) { // Should never happens
|
||
|
|
throw new JSException ("Could not load extension '" + extensions[i] + "'");
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return new JSGlobalWrapper(go,evaluator);
|
||
|
|
} catch (EcmaScriptException e) {
|
||
|
|
throw new JSException (e.getMessage(), e);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Create a built-in function object from a JSFunction object, so that
|
||
|
|
* it can be called as a standard function by native objects.
|
||
|
|
* Parameters are transformed in JSobjects if possible Java primitives are
|
||
|
|
* are left unhacnged and FESI primitives are transformed to Java primitives.
|
||
|
|
* @param evaluator the Evaluator
|
||
|
|
* @param jsf The function to wrap
|
||
|
|
*/
|
||
|
|
static public ESObject wrapJSFunction(Evaluator evaluator, JSFunction jsf) {
|
||
|
|
synchronized (evaluator) {
|
||
|
|
final JSFunction theFunction = jsf;
|
||
|
|
class WrapedJSFunction extends BuiltinFunctionObject {
|
||
|
|
WrapedJSFunction(String name, Evaluator evaluator, FunctionPrototype fp) {
|
||
|
|
super(fp, evaluator, name, 1);
|
||
|
|
}
|
||
|
|
public ESValue callFunction(ESObject thisObject,
|
||
|
|
ESValue[] arguments)
|
||
|
|
throws EcmaScriptException {
|
||
|
|
ESValue value = ESUndefined.theUndefined;
|
||
|
|
Object jsArguments[] = new Object[arguments.length];
|
||
|
|
for (int i =0; i<arguments.length; i++) {
|
||
|
|
if (arguments[i] instanceof ESWrapper) {
|
||
|
|
jsArguments[i] = ((ESWrapper)arguments[i]).getJavaObject();
|
||
|
|
} else if (arguments[i] instanceof ESObject) {
|
||
|
|
jsArguments[i] = new JSWrapper((ESObject) arguments[i], this.evaluator);
|
||
|
|
} else {
|
||
|
|
jsArguments[i] = arguments[i].toJavaObject();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
Object result = theFunction.doCall(
|
||
|
|
new JSWrapper(thisObject, this.evaluator), jsArguments);
|
||
|
|
value = ESLoader.normalizeValue(result, this.evaluator);
|
||
|
|
} catch (JSException e) {
|
||
|
|
throw new EcmaScriptException(e.getMessage());
|
||
|
|
}
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
public ESObject doConstruct(ESObject thisObject,
|
||
|
|
ESValue[] arguments)
|
||
|
|
throws EcmaScriptException {
|
||
|
|
ESObject value = null;
|
||
|
|
Object jsArguments[] = new Object[arguments.length];
|
||
|
|
for (int i =0; i<arguments.length; i++) {
|
||
|
|
if (arguments[i] instanceof ESWrapper) {
|
||
|
|
jsArguments[i] = ((ESWrapper)arguments[i]).getJavaObject();
|
||
|
|
} else if (arguments[i] instanceof ESObject) {
|
||
|
|
jsArguments[i] = new JSWrapper((ESObject) arguments[i], this.evaluator);
|
||
|
|
} else {
|
||
|
|
jsArguments[i] = arguments[i].toJavaObject();
|
||
|
|
}
|
||
|
|
}
|
||
|
|
try {
|
||
|
|
Object result = theFunction.doNew(
|
||
|
|
new JSWrapper(thisObject, this.evaluator), jsArguments);
|
||
|
|
value = ESLoader.normalizeObject(result, this.evaluator);
|
||
|
|
} catch (JSException e) {
|
||
|
|
throw new EcmaScriptException(e.getMessage());
|
||
|
|
}
|
||
|
|
return value;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return new WrapedJSFunction(jsf.toString(),
|
||
|
|
evaluator,
|
||
|
|
(FunctionPrototype) evaluator.getFunctionPrototype());
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
/**
|
||
|
|
* Display the string value of the contained object
|
||
|
|
* @return The string value
|
||
|
|
*/
|
||
|
|
public String toString() {
|
||
|
|
return object.toString();
|
||
|
|
}
|
||
|
|
}
|