M.V. Hutz
a61809ad1d
Introduce reducer.Reducer interface and update the engine to use abstract expr.Expression and reducer.Reducer types, enabling pluggable reduction strategies. - Add pkg/reducer/reducer.go with Reducer interface. - Add pkg/lambda/reducer.go with NormalOrderReducer implementation. - Update engine to accept expr.Expression and reducer.Reducer. - Update plugins to use expr.Expression directly (no pointer dereference). - Update main and tests to pass reducer to engine. Closes #30
41 lines
1.0 KiB
Go
41 lines
1.0 KiB
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/expr"
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"git.maximhutz.com/max/lambda/pkg/reducer"
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)
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// Engine is 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 expr.Expression
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Reducer reducer.Reducer
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emitter.BaseEmitter[Event]
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}
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// New creates a new engine with the given expression and reducer.
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func New(config *config.Config, expression expr.Expression, reducer reducer.Reducer) *Engine {
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return &Engine{
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Config: config,
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Expression: expression,
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Reducer: reducer,
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BaseEmitter: *emitter.New[Event](),
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}
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}
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// Run begins the reduction process.
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func (e *Engine) Run() {
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e.Emit(StartEvent)
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e.Expression = e.Reducer.Reduce(e.Expression, func(reduced expr.Expression) {
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e.Expression = reduced
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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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