Java as a scripting language.

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  • William Korvine
    #1

    Java as a scripting language.

    I have been Googling (and still am), but thought I'd just ask.

    I have an application that needs a scripting language. I have
    written my own interpreted language (a small subset of C++),
    but am considering using Java as an alternative.

    I need a hint on the following: How can I make Java use the
    named objects within my application. For example, my current
    language (ClearScript) might have the following code:

    void foo( void )
    {
    Record newrec = NewRecord( 12 ); // New record of type 12.
    newrec.Name = "Something" ; // Change the 'Name' field of the record.
    newrec.Data = Globals.Functio ns.Calculate();
    newrec.Id = Globals.States. CurrentId++;
    }

    Most of these identifiers are user controlled. 'Record' is a
    type that has hard-coded meaning to the application. 'NewRecord()'
    is a function supplied by the application to create 'Record's.
    'Calculate()' is user-written.

    I would like similer code to work in Java, but I can't
    find if it's possible to expose these objects to Java.

    Any hints would be helpful.

    William Korvine

    PS: My experience with Java is minimal. I am a C++ Windows programmer.
    Tags: None
    • Jonas Kongslund
      #2
      Re: Java as a scripting language.

      William Korvine wrote:[color=blue]
      > I need a hint on the following: How can I make Java use the
      > named objects within my application. For example, my current
      > language (ClearScript) might have the following code:[/color]
      [snip][color=blue]
      > I would like similer code to work in Java, but I can't
      > find if it's possible to expose these objects to Java.[/color]

      You may want to take a look at <http://jakarta.apache. org/bsf/index.html>.

      --
      Jonas Kongslund

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        • FISH
          #3
          Re: Java as a scripting language.

          William Korvine <korvine@hotmai l.com> wrote in message news:<Xns94389E 29FC644korvineh [email protected] 5.95.104>...

          [snipped...]
          [color=blue]
          > I would like similer code to work in Java, but I can't
          > find if it's possible to expose these objects to Java.
          >
          > Any hints would be helpful.
          >
          > William Korvine
          >
          > PS: My experience with Java is minimal. I am a C++ Windows programmer.[/color]

          There are a number of scripting implementations in Java. Jython, for
          example, is a Java version of Python. It quite cleverly merges itself
          into the existing Java 'runtime', with near-seemless access to the Java
          API's and any other packages. However, I personally found it a little
          too large and resource hungry.

          One alternative worth a look is Rhino - an old Mozilla-based project
          which provides Javascript (ECMAScript) 1.5 support for Java. Although
          none of the Java API's are automatically mirrored into the Javascript
          'domain', there is a facility to manually map Java objects into Java-
          script, making them visible to your scripts, while allowing Java to
          trap/handle accesses to properties, etc. It's more work for you, but
          the Jar is quite small, it appears to run at a decent speed, and
          Javascript is very well known and supported on-line (important if end
          users are to use the scripting facilities of your product!)

          Page not found | MDN
          http://www.mozilla.org/rhino/
          The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.


          -FISH- ><>

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