Perl 6
Default SMOP Interpreter Implementation: Revision 4

The default SMOP Interpreter Implementation (aka SLIME) implements simply a frame object that have nodes. The parts of this implementation are:

  • A Node prototype and its instances
  • A Frame prototype and its instances
  • Lowlevel operators that manipulate the Frame

SMOP__SLIME__Node

The Node prototype just declares an object that have a set of members.

  • responder
  • identifier
  • capture
  • debug
  • result

This members can be passed to Node.new() as named arguments.

SMOP__SLIME__Frame

The Frame prototype defines the implementation in itself, it's the one with the "eval" method. It has the following members.

  • jail
  • lexical
  • back
  • nodes
  • current

And the following methods:

  • new(SMOP__SLIME__Frame: *@nodes) -- creates a new frame object defining the nodes.
  • next($frame: ) -- goes to the next node in the stack, possibly drop frames.
  • goto($frame: $node) -- sets the node as the currently selected node.
  • eval($frame: ) -- evaluates the currently selected node and stores the result in the result field of the node.
  • result($frame: $count) -- gets the result of the past node that is $count away from the current node.
  • has_next($frame: ) -- returns true if there's any more node to eval.
  • setr($frame: $value) -- sets the result of the current node to the given value.

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