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Now we’re ready to introduce goals and the operations that build them. Every goal will be an instance of this class:

A goal simply wraps up a block of code, and to pursue that goal in a particular state, the block is called with the state as an argument. So “goal” is really just a nice name for a , but having a dedicated Goal class gives us somewhere convenient to put methods for building different kinds of goal.

There are only four kinds of goal in the language we’re building, and two of them are very basic.

The first kind, called equal , is the only kind of goal that isn’t made out of other goals. An equal goal contains two values, and when it’s pursued in a particular state, it tries to make its two values equal by unifying them in that state.

Here’s an example. We’ll make a new state that has some variables in it, and then use a Goal . equal factory method to make a goal that says x is equal to 5 :

If we pursue that goal in our original empty state, we get back a stream of results:

(We’re using an enumerator to represent a stream here. An enumerator is just an object we can call #next on and keep getting more values out.)

The first result in the stream is a state that says the value of x is 5 :

So the goal has succeeded in making x equal to 5 .

If we try to retrieve another result from the stream we get a StopIteration exception, because the goal only produced one state:

Here’s how Goal . equal is implemented:

To construct an equal goal we have to provide the two values, a and b . When the goal is pursued in a particular state, it unifies a and b in that state and produces a stream of states — an enumerator — as its result.

The code inside the Enumerator . new block yields an output state if unification was successful, otherwise it does nothing, so the resulting stream either contains a single state or is empty.

Explicitly creating variables just to pass them to a goal is a bit inconvenient, which is why we have the other kind of basic goal, called with_variables . The job of a with_variables goal is to run an existing goal and automatically provide it with as many local variables as it needs.

For example, we can take an equal goal that expects to use a variable called x , and wrap it up into a with_variables goal so that the local variable x is automatically created when we need it:

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