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copyright @ anand rathi 2012

General description

Libjspp allows easy interfacing & interacting ofC++ with javascript[currently spidermonkey1.8.5]

Non intrusive to C++ & javascript world at sametime.

Useful for applications who want to Embed &Extend in Object oriented manner.

Very thin interface, By using C++ templates.

App can create multiple javascript engines perprocess or per thread and export native

functions , class, variables. Cont...

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General description Multi threaded support for each engine per

thread. Dynamically define Cached & Non Cached

property.

Caching of properties defined in native &anonymous object allow direct local acess

without need of conversions.

Caching of strings avoids trivial & frequentsmemory allocations.

Cont...

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General description

Javascript world is agnoustic about to fact thatclass / object was by C++

Exported C++ class objects is agnoustic to fact

that they are Proxy to Javascript object.

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Example: Anonymous Object use caseC++ Code for creating object called 'MyObject'

void testfunc() { std::cout

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Javascript Code using 'MyObject'

CONSOLE.writeln(MyObject.x);

CONSOLE.writeln(MyObject.y);

CONSOLE.writeln(MyObject.shx);

MyObject.shx="5432 5432 5432 5432 5432 5432 5432 5432 5432 54321 53" ;

MyObject.shx="5432 5432 5432 5432 5432 5432 5432 5432 48" ;MyObject.testfunc();

MyObject.testfunca(" test string");

MyObject.testfuncb(" test string b");

MyObject.testfuncc(1234);

MyObject.testfuncd(111.222);

CONSOLE.writeln('hello \n') ;

Cont...

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Example: Export Native Class use caseC++ Code for creating object called ''

class Cc {public:

Cc(){printf("In default constructor of c \n"); }Cc(int pi) {

printf("In constructor of c %d\n",pi );

i=pi;d=3.33;s="444";

}Cc(std::string i) {printf("In constructor of c %s\n",i.c_str() );}Cc(std::string & i) {printf("In constructor of c %s\n",i.c_str() ); }char c;int i;

double d;std::string s;int sfunc(std::string& a) { std::cout ("ivar").setVariable< double, &Cc::d >("dvar").setVariable< std::string, &Cc::s >("svar");///Export Native C++ class and its properties & function

pec->registerEngine(_js);int eret = _js.CompileExecuteFile("/home/libcdr/TestJSScriptExportClass.js");

}Cont...

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Javascript Code creating and using Export Native Class

//

CONSOLE.writeln('hello \n') ;var tObj = new testclass(2);tObj.sfunc("Hello JS\n")CONSOLE.write('tObj.ivar=') ;CONSOLE.writeln(tObj.ivar) ;CONSOLE.write('tObj.dvar=') ;CONSOLE.writeln(tObj.dvar) ;CONSOLE.write('tObj.svar=') ;CONSOLE.writeln(tObj.svar) ;

CONSOLE.writeln('done\n') ;

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Future work ..cont Export more complex class properties, function Parameter

currently only std::string, int, double are mappedexampleclass A {

std::string s;};class B {

A peropertyA};

JSEngine _js;exporterCLass *pecA = exporterCLass::GetInstance("A");

pecA->setVariable< std::string, &A::s >("s")pecA->registerEngine(_js);

exporterCLass *pecB = exporterCLass::GetInstance("B");pecB->setVariable< exporterCLass, &B::A >("peropertyA")

----------------------------------------------------------------------

In javascript

var tObj = new B();tObj.peropertyA = Hello;

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... Future work

Adding capablity to Invoke Javascript functionfrom C++

Adding capablity to acess Javascript properties

from C++ Javascript as Inversion of control

Upto 10 or more parameters in functions &

constructors Modules to wrap various other C/C++ libraries

database , http server, curl and more goodies

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