M.V. Hutz
f8e1223463
## Description This PR builds on #30 to complete the abstraction layer for multi-mode evaluation support. The engine now accepts abstract `expr.Expression` and `reducer.Reducer` types instead of concrete lambda types. - Add `pkg/reducer/reducer.go` with `Reducer` interface defining `Reduce(expr.Expression, onStep) expr.Expression`. - Add `pkg/lambda/reducer.go` with `NormalOrderReducer` that wraps the existing `ReduceAll` logic. - Update `engine.Engine` to store `expr.Expression` and `reducer.Reducer` instead of `*lambda.Expression`. - Update plugins to use `expr.Expression.String()` directly (no pointer dereference needed). - Update main and tests to instantiate `NormalOrderReducer` and pass it to the engine. ### Decisions - The `Reducer.Reduce` method returns the final expression and calls `onStep` after each reduction step with the current state. - `NormalOrderReducer` type-asserts to `lambda.Expression` internally; other expression types are returned unchanged. - The engine updates its `Expression` field both during reduction (via `onStep`) and after completion. ## Benefits - The engine is now fully decoupled from lambda-specific types. - New evaluation modes can be added by implementing `expr.Expression` and `reducer.Reducer`. - Plugins work with any expression type that implements `expr.Expression`. - Prepares the codebase for SKI combinators, typed lambda calculus, or other future modes. ## Checklist - [x] Code follows conventional commit format. - [x] Branch follows naming convention (`<type>/<description>`). - [x] Tests pass (if applicable). - [ ] Documentation updated (if applicable). Closes #30 Reviewed-on: #31 Co-authored-by: M.V. Hutz <git@maximhutz.me> Co-committed-by: M.V. Hutz <git@maximhutz.me>
24 lines
413 B
Go
24 lines
413 B
Go
package plugins
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import (
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"log/slog"
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"git.maximhutz.com/max/lambda/internal/engine"
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)
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type Logs struct {
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logger *slog.Logger
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process *engine.Engine
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}
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func NewLogs(logger *slog.Logger, process *engine.Engine) *Logs {
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plugin := &Logs{logger, process}
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process.On(engine.StepEvent, plugin.Step)
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return plugin
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}
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func (t *Logs) Step() {
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t.logger.Info("reduction", "tree", t.process.Expression.String())
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}
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