// name: eval.ck
// desc: use Machine.eval() to compile and run code from a string;
//       this as enables chuck to generate code to run at run-time;
//       powerful! perilous!
//
// version: requires chuck-1.5.0.5 or higher
//          Machine.eval() was first introduced in 1.5.0.0;
//          the operation semantics was changed in 1.5.0.5 for
//          Machine eval to run immediately, and automatically
//          yielding the current shred to give the eval'ed code
//          a chance to run -- all this without advancing time
//
// uncomment this to print out info about Machine:
// Machine.help();
//
// date: Spring 2023

// our code to run
"cherr <= \"hello!\" <= IO.newline();" => string codeStr;

// compile the string as code and spork it as a new shred
if( !Machine.eval( codeStr ) ) <<< "error evaluating code!", "" >>>;

// each of these will be evaluated and run as code,
// each on its independent shred; Machine.eval() automatically
// yields the originating "evaluator" shred, giving the evaluated
// code a chance to run without advancing time
Machine.eval( "<<< 1 >>>;" );
<<< "a" >>>;
Machine.eval( "<<< 2 >>>;" );
<<< "b" >>>;
Machine.eval( "<<< 3 >>>;" );
<<< "c" >>>;