How do I include a javascript function inside of embedded v8?

[Renier]

I have an application that embeds v8 and I want to include a series of helper javascript functions at the time of compiling a code snippet so that the user is able to use my helper functions.

These functions don't interact with C++ at all and are merely there as helper functions.

i.e.

function doStuff(x, y){
   return x + y + "weeee";
}
function doSomethingElse(){
}

Is there a sample of the above?

I have tried to use an v8::ObjectTemplate and merely doing the following without any success as I get `Reference error: doSomethingElse is not defined`

v8::Handle<v8::ObjectTemplate> result = v8::ObjectTemplate::New();
result->Set(v8::String::NewFromUtf8(v8::Isolate::GetCurrent(), *functionName), v8::String::NewFromUtf8(v8::Isolate::GetCurrent(), *functionSource));

functionName is set to "doStuff" and the definition of the function lives inside of the functionSource.

I have then created a context with this template and I get the above mentioned error message when I attempt to access these functions.

Regards

Renier

[Ben Noordhuis]

Compile (and run) the source with v8::Script or v8::ScriptCompiler.

You could also use v8::RegisterExtension() but that's a bit more work.

[Renier]

Thanks for the quick reply Ben, but i'm not sure i'm following

[Renier]

Are you saying I should compile each script in the context of where I will run the user's js?

[Abhishek Singh]

Before compilation of user supplied JS code(assuming you’re storing it as std::string), append the helper functions to it(which you might be reading from a file sitting in some predefined location) and finally compile the resultant std::string(in below snippet assuming “src” stores the resultant final string). 

Local<String> source = String::NewFromUtf8(isolate, src.c_str(), NewStringType::kNormal).ToLocalChecked();

Local<Script> script = Script::Compile(context, source).ToLocalChecked();

Local<Value> result = script->Run(context).ToLocalChecked();

You could refer to process.cc within V8 src, which does something similar amount various other things.

On 06-Sep-2016, at 7:15 PM, Renier <germishu...@gmail.com> wrote:

Are you saying I should compile each script in the context of where I will run the user's js?

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