M.V. Hutz
eba2182151
Introduce pkg/expr.Expression as a base interface for all evaluatable expression types, enabling future support for multiple evaluation modes (SKI combinators, typed lambda calculus, etc.). - Add pkg/expr/expr.go with Expression interface requiring String() method. - Update lambda.Expression to embed expr.Expression. - Add String() method to Abstraction, Application, and Variable types. - Update plugins to use String() instead of lambda.Stringify().
37 lines
856 B
Go
37 lines
856 B
Go
// Package "engine" provides an extensible interface for users to interact with
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// λ-calculus and other expression evaluation modes.
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package engine
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import (
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"git.maximhutz.com/max/lambda/internal/config"
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"git.maximhutz.com/max/lambda/pkg/emitter"
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"git.maximhutz.com/max/lambda/pkg/lambda"
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)
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// A process for reducing one expression.
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type Engine struct {
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Config *config.Config
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Expression *lambda.Expression
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emitter.BaseEmitter[Event]
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}
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// Create a new engine, given an unreduced λ-expression.
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func New(config *config.Config, expression *lambda.Expression) *Engine {
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return &Engine{
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Config: config,
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Expression: expression,
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BaseEmitter: *emitter.New[Event](),
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}
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}
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// Begin the reduction process.
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func (e *Engine) Run() {
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e.Emit(StartEvent)
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lambda.ReduceAll(e.Expression, func() {
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e.Emit(StepEvent)
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})
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e.Emit(StopEvent)
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}
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