org.mozilla.javascript.NativeScript Maven / Gradle / Ivy
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/* -*- Mode: java; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
package org.mozilla.javascript;
/**
* 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, will forward requests to
* execute to the nonnull 'script' field.
*
* @since 1.3
* @author Norris Boyd
*/
class NativeScript extends BaseFunction {
private static final long serialVersionUID = -6795101161980121700L;
private static final Object SCRIPT_TAG = "Script";
static void init(Scriptable scope, boolean sealed) {
NativeScript obj = new NativeScript(null);
obj.exportAsJSClass(MAX_PROTOTYPE_ID, scope, sealed);
}
private NativeScript(Script script) {
this.script = script;
}
/** Returns the name of this JavaScript class, "Script". */
@Override
public String getClassName() {
return "Script";
}
@Override
public Object call(Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
if (script != null) {
return script.exec(cx, scope);
}
return Undefined.instance;
}
@Override
public Scriptable construct(Context cx, Scriptable scope, Object[] args) {
throw Context.reportRuntimeErrorById("msg.script.is.not.constructor");
}
@Override
public int getLength() {
return 0;
}
@Override
public int getArity() {
return 0;
}
@Override
String decompile(int indent, int flags) {
if (script instanceof NativeFunction) {
return ((NativeFunction) script).decompile(indent, flags);
}
return super.decompile(indent, flags);
}
@Override
protected void initPrototypeId(int id) {
String s;
int arity;
switch (id) {
case Id_constructor:
arity = 1;
s = "constructor";
break;
case Id_toString:
arity = 0;
s = "toString";
break;
case Id_exec:
arity = 0;
s = "exec";
break;
case Id_compile:
arity = 1;
s = "compile";
break;
default:
throw new IllegalArgumentException(String.valueOf(id));
}
initPrototypeMethod(SCRIPT_TAG, id, s, arity);
}
@Override
public Object execIdCall(
IdFunctionObject f, Context cx, Scriptable scope, Scriptable thisObj, Object[] args) {
if (!f.hasTag(SCRIPT_TAG)) {
return super.execIdCall(f, cx, scope, thisObj, args);
}
int id = f.methodId();
switch (id) {
case Id_constructor:
{
String source = (args.length == 0) ? "" : ScriptRuntime.toString(args[0]);
Script script = compile(cx, source);
NativeScript nscript = new NativeScript(script);
ScriptRuntime.setObjectProtoAndParent(nscript, scope);
return nscript;
}
case Id_toString:
{
NativeScript real = realThis(thisObj, f);
Script realScript = real.script;
if (realScript == null) {
return "";
}
return cx.decompileScript(realScript, 0);
}
case Id_exec:
{
throw Context.reportRuntimeErrorById("msg.cant.call.indirect", "exec");
}
case Id_compile:
{
NativeScript real = realThis(thisObj, f);
String source = ScriptRuntime.toString(args, 0);
real.script = compile(cx, source);
return real;
}
}
throw new IllegalArgumentException(String.valueOf(id));
}
private static NativeScript realThis(Scriptable thisObj, IdFunctionObject f) {
return ensureType(thisObj, NativeScript.class, f);
}
private static Script compile(Context cx, String source) {
int[] linep = {0};
String filename = Context.getSourcePositionFromStack(linep);
if (filename == null) {
filename = "