var.eval.fmfn

/*
 * =====================================================
 * var.eval( contents )
 * 
 * RETURNS:        (bool) True or False based on proper evaluation
 * DEPENDENCIES:   none 
 * NOTES:          Try to always use the List() function when passing multiple values into var.eval!
 * =====================================================
 * 
 * This custom function evaluates the contents passed as the
 * variable declaration part of a Let function. Useful for
 * defining global or locally scoped variables.
 * 
 */

Let( [
  $$ERROR.VAR.EVAL = ""; // Reset the global error variable for evaluation
  var.semicolons_exist = ( ValueCount ( contents ) = PatternCount ( contents ; ";¶" ) ) or  ( ValueCount ( contents ) - 1 = PatternCount ( contents ; ";¶" ) );
  var.contents = If ( not var.semicolons_exist ; Substitute ( contents ; ¶ ; ";¶") ; contents ); // Add semicolons if needed
  var.trailing_semicolon = Right ( var.contents ; 1 ) = ";"; // Clean off the trailing semicolon if present
  var.contents = If ( var.trailing_semicolon; Left ( var.contents ; Length( var.contents ) - 1 ); var.contents )
];
  If (
      Evaluate( 
          "Let ( [" & var.contents & "]; 1 )"        
      ) = "?";
      Let ( $$ERROR.VAR.EVAL = "EVAL ERROR¶-----¶" & var.contents; False );
      True
  )
)