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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* The contents of this file are subject to the Netscape Public
* License Version 1.1 (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/NPL/
*
* Software distributed under the License is distributed on an "AS
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express oqr
* implied. See the License for the specific language governing
* rights and limitations under the License.
*
* The Original Code is Rhino code, released
* May 6, 1999.
*
* The Initial Developer of the Original Code is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1997-1999 Netscape Communications Corporation. All
* Rights Reserved.
*
* Contributor(s):
* Norris Boyd
* Roger Lawrence
* Mike McCabe
*
* Alternatively, the contents of this file may be used under the
* terms of the GNU Public License (the "GPL"), in which case the
* provisions of the GPL are applicable instead of those above.
* If you wish to allow use of your version of this file only
* under the terms of the GPL and not to allow others to use your
* version of this file under the NPL, indicate your decision by
* deleting the provisions above and replace them with the notice
* and other provisions required by the GPL. If you do not delete
* the provisions above, a recipient may use your version of this
* file under either the NPL or the GPL.
*/
package org.mozilla.javascript;
import java.io.StringReader;
import java.io.IOException;
/**
* The JavaScript Script object.
*
* Note that the C version of the engine uses XDR as the format used
* by freeze and thaw. Since this depends on the internal format of
* structures in the C runtime, we cannot duplicate it.
*
* Since we cannot replace 'this' as a result of the compile method,
* this class has a dual nature. Generated scripts will have a null
* 'script' field and will override 'exec' and 'call'. Scripts created
* using the JavaScript constructor will forward requests to the
* nonnull 'script' field.
*
* @since 1.3
* @author Norris Boyd
*/
public class NativeScript extends NativeFunction implements Script {
public NativeScript() {
}
/**
* Returns the name of this JavaScript class, "Script".
*/
public String getClassName() {
return "Script";
}
/**
* Initialize script.
*
* Does nothing here, but scripts will override with code
* to initialize contained functions, regexp literals, etc.
*/
public void initScript(Scriptable scope) {
}
/**
* The Java method defining the JavaScript Script constructor.
*
*/
public static Object jsConstructor(Context cx, Object[] args,
Function ctorObj, boolean inNewExpr)
{
String source = args.length == 0
? ""
: ScriptRuntime.toString(args[0]);
Scriptable scope = cx.ctorScope;
if (scope == null)
scope = ctorObj;
return compile(scope, source);
}
public static Script compile(Scriptable scope, String source) {
Context cx = Context.getContext();
StringReader reader = new StringReader(source);
try {
int[] linep = { 0 };
String filename = Context.getSourcePositionFromStack(linep);
if (filename == null) {
filename = "<Script object>";
linep[0] = 1;
}
Object securityDomain =
cx.getSecurityDomainForStackDepth(5);
return cx.compileReader(scope, reader, filename, linep[0],
securityDomain);
}
catch (IOException e) {
throw new RuntimeException("Unexpected IOException");
}
}
public Scriptable jsFunction_compile(String source) {
script = compile(null, source);
return this;
}
public Object jsFunction_exec() throws JavaScriptException {
Object[] msgArgs = { "exec" };
throw Context.reportRuntimeError(
Context.getMessage("msg.cant.call.indirect", msgArgs));
}
public static Object jsFunction_toString(Context cx, Scriptable thisObj,
Object[] args, Function funObj)
{
Script thisScript = ((NativeScript) thisObj).script;
if (thisScript == null)
thisScript = (Script) thisObj;
Scriptable scope = getTopLevelScope(thisObj);
return cx.decompileScript(thisScript, scope, 0);
}
/*
* Override method in NativeFunction to avoid ever returning "anonymous"
*/
public String jsGet_name() {
return "";
}
/**
* Execute the script.
*
* Will be overridden by generated scripts; needed to implement Script.
*/
public Object exec(Context cx, Scriptable scope)
throws JavaScriptException
{
return script == null ? Undefined.instance : script.exec(cx, scope);
}
public Object call(Context cx, Scriptable scope, Scriptable thisObj,
Object[] args)
throws JavaScriptException
{
return exec(cx, scope);
}
public Scriptable construct(Context cx, Scriptable scope, Object[] args)
throws JavaScriptException
{
String message = Context.getMessage("msg.script.is.not.constructor", null);
throw Context.reportRuntimeError(message);
}
private Script script;
}