Re: Embeddable and Extensible Languages

On 15 Jan 2005 20:57:49 -0500, "PlayDough" <petela@gocougs.wsu.edu>
wrote:


>PlayDough wrote:
>
>... is there a language that guarantees that x1's interpreter
>and x2's interpreter will not collide in threads?


What you want is a sandbox.


I second Thant Tessman 's recommendation for a Scheme based solution.
Using syntax macros or input parsers you can give your users just
about any input syntax you wish. Scheme limits code to interaction
with a particular execution environment and R5RS implementations have
built-in support for multiple environments. By controlling the input
syntax, you can also restrict the ways in which users are allowed to
extend their environment.


There are several embeddable Schemes. Not all are based on the R5RS
spec (necessary if you wanted to roll your own sandboxing), but every
implementation I have seen has some kind of extension for multiple
environments even if it isn't based on R5RS.


George

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