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btiffin
Posted on: 2012/3/2 9:53
Home away from home
Joined: 2008/6/7
From: CANADA
Posts: 1196
Re: V8 javascript in OpenCOBOL
Ok, three tries.
OCOBOL >>SOURCE FORMAT IS FIXED
      *> ***************************************************************
      *> Author:    Brian Tiffin
      *> Date:      20120227
      *> Purpose:   Embed V8 javascript
      *> 
      *> Tectonics: from http://code.google.com/apis/v8/build.html
      *>            and in a fresh svn checkout directory
      *>    scons library=shared arch=x64
      *>    g++ -c ocv8js.cpp -Iinclude -L. -o ocv8js.o -lpthread
      *>    cobc -x ocv8.cob ocv8js.o -lv8 -lstdc++ -L .
      *> ***************************************************************
       identification division.
       program-id. ocv8.

       data division.
       77 result     usage binary-long.
       01 v8-value   pic x(32767).

      *> -*********-*********-*********-*********-*********-*********-**
       procedure division.
       display "Calling CBL_OC_V8JAVASCRIPT" end-display

       call "CBL_OC_V8JAVASCRIPT"
           using
               "'Hello' + ', world'"
               v8-value
               by value function length(v8-value)
           returning result
           on exception
               display "v8 linkage problem, result garbage" end-display
               continue
       end-call
       
       display "V8 gives :" function trim(v8-value) ":" end-display

       goback.
       end program ocv8.

Forgot the C string null on the CALL literal. I've updated the original post. The listing above is the unsafe version for context. Don't cut nor paste this one.

Plus: This discussion on LinkedIn has led to the idea of a new project to attempt to embed Node.js into OpenCOBOL. I'm going to try a CALL interface first.

Cheers,
Brian
btiffin
Posted on: 2012/2/28 4:12
Home away from home
Joined: 2008/6/7
From: CANADA
Posts: 1196
V8 javascript in OpenCOBOL
<From a thread on linkedin>

Michael,

I did (ala http://code.google.com/apis/v8/build.html)
$ svn checkout http://v8.googlecode.com/svn/trunk/ v8-read-only
$ cd v8-read-only
$ scons arch=x64
$ scons arch=x64 library=shared
$ g++ -c ocv8js.cpp -Iinclude -L. -o ocv8js.o -lpthread
$ cobc -x ocv8.cob ocv8js.o -lv8 -lstdc++ -L .
$ LD_LIBRARY_PATH=$PWD ./ocv8

with ocv8js.cpp
#include <v8.h>
#include <string.h>

using namespace v8;

extern "C" {
int CBL_OC_V8JAVASCRIPT(char* arg, char* out, int outlen) {


  // Create a stack-allocated handle scope.
  HandleScope handle_scope;

  // Create a new context.
  Persistent<Context> context = Context::New();
  
  // Enter the created context for compiling and
  // running the hello world script. 
  Context::Scope context_scope(context);

  // Create a string containing the JavaScript source code.
  Handle<String> source = String::New(arg);

  // Compile the source code.
  Handle<Script> script = Script::Compile(source);
  
  // Run the script to get the result.
  Handle<Value> result = script->Run();
  
  // Dispose the persistent context.
  context.Dispose();

  // Convert the result to an ASCII string and cpy to COBOL
  String::AsciiValue ascii(result);
  strncpy(out, *ascii, outlen);

  return 0;
}
}

and
OCOBOL >>SOURCE FORMAT IS FIXED
      *> ***************************************************************
      *> Author:    Brian Tiffin
      *> Date:      20120227
      *> Purpose:   Embed V8 javascript
      *> 
      *> Tectonics: from http://code.google.com/apis/v8/build.html
      *>            and in a fresh svn checkout directory
      *>    scons library=shared arch=x64
      *>    g++ -c ocv8js.cpp -Iinclude -L. -o ocv8js.o -lpthread
      *>    cobc -x ocv8.cob ocv8js.o -lv8 -lstdc++ -L .
      *> ***************************************************************
       identification division.
       program-id. ocv8.

       data division.
       77 result     usage binary-long.
       01 v8-value   pic x(32767).

      *> -*********-*********-*********-*********-*********-*********-**
       procedure division.
       display "Calling CBL_OC_V8JAVASCRIPT" end-display

       call "CBL_OC_V8JAVASCRIPT"
           using
               "'Hello' + ', world'" & x"00"
               v8-value
               by value function length(v8-value)
           returning result
           on exception
               display "v8 linkage problem, result garbage" end-display
               continue
       end-call
       
       move function substitute(v8-value, x"00", space) to v8-value
       display "V8 gives :" function trim(v8-value) ":" end-display

       goback.
       end program ocv8.

and as none of this is installed, need to tweak the library lookup path for testing
$ LD_LIBRARY_PATH=$PWD ./ocv8 
Calling CBL_OC_V8JAVASCRIPT
V8 gives :Hello, world:


Worked the beauty first try. But, man is the V8 code ever codey, err, I mean top-end C++.

v8 sources really are top-end everyone. But C++ is always codey lookin'. The more high end, the codey-er.

Cheers,
Brian
and I lied, nothing ever works first try, but two in this case...I forgot the BY VALUE on the length int, and first try was a segfault. Always heart warming and very motivational when experimenting with unknown new libraries.
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