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/*
* @file ejsClass.c
* @brief EJS class support
*/
/********************************* Copyright **********************************/
/*
* @copy default
*
* Copyright (c) Mbedthis Software LLC, 2003-2006. All Rights Reserved.
* Copyright (c) Michael O'Brien, 1994-1995. All Rights Reserved.
*
* This software is distributed under commercial and open source licenses.
* You may use the GPL open source license described below or you may acquire
* a commercial license from Mbedthis Software. You agree to be fully bound
* by the terms of either license. Consult the LICENSE.TXT distributed with
* this software for full details.
*
* This software is open source; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See the GNU General Public License for more
* details at: http://www.mbedthis.com/downloads/gplLicense.html
*
* This program is distributed WITHOUT ANY WARRANTY; without even the
* implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* This GPL license does NOT permit incorporating this software into
* proprietary programs. If you are unable to comply with the GPL, you must
* acquire a commercial license to use this software. Commercial licenses
* for this software and support services are available from Mbedthis
* Software at http://www.mbedthis.com
*
* @end
*/
/********************************* Includes ***********************************/
#include "ejs.h"
#if BLD_FEATURE_EJS
/************************************ Code ************************************/
/*
* Internal API
*
* Routine to create a simple class object. This routine will create a
* stand-alone class object. Callers must insert this into the relevant
* "global" object for name resolution. From these class objects, instance
* objects may be created via the javascript "new" command.
*
* Users should use ejsDefineClass
*/
EjsVar *ejsCreateSimpleClass(Ejs *ep, EjsVar *baseClass, const char *className)
{
EjsProperty *pp;
EjsVar *classObj;
/*
* Create an instance of an Object to act as the static class object
*/
classObj = ejsCreateSimpleObjUsingClass(ep, baseClass);
if (classObj == 0) {
mprAssert(classObj);
return 0;
}
ejsSetClassName(ep, classObj, className);
/*
* Set the propotype property to point to this class.
* Note: this is a self reference so the alive bit will not be turned on.
*/
pp = ejsSetProperty(ep, classObj, "prototype", classObj);
ejsMakePropertyEnumerable(pp, 0);
return classObj;
}
/******************************************************************************/
/*
* Define a class in the given interpreter. If parentClass is specified, the
* class is defined in the parent. Otherwise, the class will be defined
* locally/globally. ClassName and extends are full variable specs
* (may contain ".")
*/
EjsVar *ejsDefineClass(Ejs *ep, const char *className, const char *extends,
EjsCMethod constructor)
{
EjsVar *parentClass, *classObj, *baseClass, *vp;
char *name;
char *cp;
/*
* If the className is a qualified name (with "."), then get the
* parent class name.
*/
name = mprStrdup(ep, className);
cp = strrchr(name, '.');
if (cp != 0) {
*cp++ = '\0';
className = cp;
parentClass = ejsFindProperty(ep, 0, 0, ep->global, ep->local, name, 0);
if (parentClass == 0 || parentClass->type != EJS_TYPE_OBJECT) {
mprError(ep, MPR_LOC, "Can't find class's parent class %s", name);
mprFree(name);
return 0;
}
} else {
/*
* Simple class name without a "." so create the class locally
* if a local scope exists, otherwise globally.
*/
parentClass = (ep->local) ? ep->local : ep->global;
}
if (parentClass == 0) {
mprError(ep, MPR_LOC, "Can't find parent class");
mprFree(name);
return 0;
}
/* OPT should use function that doesn't parse [] . */
baseClass = ejsGetClass(ep, 0, extends);
if (baseClass == 0) {
mprAssert(baseClass);
mprFree(name);
return 0;
}
classObj = ejsCreateSimpleClass(ep, baseClass, className);
if (classObj == 0) {
mprAssert(classObj);
mprFree(name);
return 0;
}
if (constructor) {
ejsDefineCMethod(ep, classObj, className, constructor, 0);
}
ejsSetPropertyAndFree(ep, parentClass, className, classObj);
vp = ejsGetPropertyAsVar(ep, parentClass, className);
mprFree(name);
return vp;
}
/******************************************************************************/
/*
* Find a class and return the property defining the class. ClassName may
* contain "." and is interpreted relative to obj. Obj is typically some
* parent object, ep->local or ep->global. If obj is null, then the global
* space is used.
*/
EjsVar *ejsGetClass(Ejs *ep, EjsVar *obj, const char *className)
{
EjsVar *vp;
mprAssert(ep);
/*
* Search first for a constructor of the name of class
* global may not be defined yet.
*/
if (obj) {
vp = ejsFindProperty(ep, 0, 0, obj, 0, className, 0);
} else {
mprAssert(ep->global);
vp = ejsFindProperty(ep, 0, 0, ep->global, ep->local, className, 0);
}
if (vp == 0 || vp->type != EJS_TYPE_OBJECT) {
return 0;
}
/*
* Return a reference to the prototype (self) reference. This
* ensures that even if "obj" is deleted, this reference will remain
* usable.
*/
return ejsGetPropertyAsVar(ep, vp, "prototype");
}
/******************************************************************************/
/*
* Return the class name of a class or object
*/
const char *ejsGetClassName(EjsVar *vp)
{
EjsObj *obj;
mprAssert(vp);
mprAssert(vp->type == EJS_TYPE_OBJECT);
mprAssert(vp->objectState->baseClass);
if (vp == 0 || !ejsVarIsObject(vp)) {
return 0;
}
obj = vp->objectState;
return obj->className;
}
/******************************************************************************/
/*
* Return the class name of an objects underlying class
* If called on an object, it returns the base class.
* If called on a class, it returns the base class for the class.
*/
const char *ejsGetBaseClassName(EjsVar *vp)
{
EjsObj *obj;
mprAssert(vp);
mprAssert(vp->type == EJS_TYPE_OBJECT);
mprAssert(vp->objectState->baseClass);
if (vp == 0 || !ejsVarIsObject(vp)) {
return 0;
}
obj = vp->objectState;
if (obj->baseClass == 0) {
return 0;
}
mprAssert(obj->baseClass->objectState);
return obj->baseClass->objectState->className;
}
/******************************************************************************/
EjsVar *ejsGetBaseClass(EjsVar *vp)
{
if (vp == 0 || !ejsVarIsObject(vp) || vp->objectState == 0) {
mprAssert(0);
return 0;
}
return vp->objectState->baseClass;
}
/******************************************************************************/
void ejsSetBaseClass(EjsVar *vp, EjsVar *baseClass)
{
if (vp == 0 || !ejsVarIsObject(vp) || vp->objectState == 0) {
mprAssert(0);
return;
}
vp->objectState->baseClass = baseClass;
}
/******************************************************************************/
#else
void ejsProcsDummy() {}
/******************************************************************************/
#endif /* BLD_FEATURE_EJS */
/*
* Local variables:
* tab-width: 4
* c-basic-offset: 4
* End:
* vim:tw=78
* vim600: sw=4 ts=4 fdm=marker
* vim<600: sw=4 ts=4
*/
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