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yodii-script

Yodii.Script is a purely interpreted script language loosely based on javascript that supports function with closures. One of its major specificty is to be implemnted as a state machine: it evaluates its script in the calling thread, step-by-step or per time-slice without any cross threads concerns. A very simple template engine (based on <% ... %> and <%= ... %> tags) is also available.

It is under developpement and any contributions are welcome.

Key aspects

  • Primary goal is full thread safety and API security. Not performance!
  • Safe scripting language implemented as a a state machine (no thread at all but nevertheless interuptible: breakpoints, step in, step over, etc.).
  • Easy binding (two-way for writable properties and fields for instance) to any external .Net object (uses reflection) that relies on a rather original way to publish an API to the script.
  • No dependency (currently released only on .Net 4.5.1 and netstandard1.3) and still less than 100KB dll.
  • Inspired from javascript but with important differences to be more .Net compliant.
  • No more === and !==
    • Current == and != operators act as strict operators.
  • With object support (the awful with: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/with).
    • Because this "feature" can be useful to adapt existing DSL.

To Do list

  • Enable API securization (currently any properties or methods of external objects are callable).
    • A simple call validation hook should minimally do the job.
    • White/Black list and support of a kind of [SafeScript] attribute or ISafeScript marker interface may be useful.
  • "Number" must be replaced with "Integer" and "Double". Integer must be the default but implicit conversion between the two must be supported.
  • Support a DateTime .Net object.
  • String currently supports only indexer [] (instead of charAt() javascript method) and ToString().
    • StringObj must support all other useful methods (Contains, Substring, etc.).
  • Export script functions as native functions (NativeFunctionObj does the job in the opposite way):
    • From the script to the external world (FunctionObj.ToNative() must return a callable delegate). Evaluation of such delegate must take place on the primary thread on dedicated frame stacks.
  • Transparently support async/await (actually any awaitable return) with the defined but not implemented PExpr.DeferredKind.AsyncCall.