Trait Evaluator

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pub trait Evaluator {
    type Id;
    type Module;
    type Error;

    // Required methods
    fn is_empty(&self) -> bool;
    fn next(&mut self) -> Option<Self::Id>;
    fn eval(
        &mut self,
        id: Self::Id,
        imports: Imports<Self::Id>,
        module: Self::Module,
    ) -> Result<(), Self::Error>;
    fn finish(self) -> Option<Self::Module>;
}

Expand description

An evaluator.

An evaluator is the main mechanism with which Merge is utilized. The goal of the Evaluator is to Merge modules which may of may not import other modules.

Required Associated Types§

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type Id

Id of a module.

This can be anything that can uniquely identify a module. For example, a filesystem path.

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type Module

The type of the module.

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type Error

Evaluation error.

Required Methods§

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fn is_empty(&self) -> bool

Check whether the evaluator has evaluated any modules.

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fn next(&mut self) -> Option<Self::Id>

Get the next module in evaluation order.

Evaluation order is implementation-specific. An implementation might choose to evaluate modules in DFS, BFS or some other unspecified order. Returns None when there are no modules left to evaluate.

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