M.V. Hutz
a3ee34732e
## Description The old architecture used a monolithic `main()` with a custom arg parser, an event-emitter-based runtime, and a plugin system for optional features. This PR rewrites the CLI and internal architecture to be modular, extensible, and built around a registry of interchangeable components. - Replace custom CLI arg parsing with Cobra subcommands (`convert`, `reduce`, `engine list`). - Introduce a registry system (`internal/registry`) for marshalers, codecs, and engines, with BFS-based conversion path resolution. - Add type-erased adapter layer (`internal/cli`) with `Repr`, `Engine`, `Process`, `Marshaler`, and `Conversion` interfaces wrapping generic `pkg/` types. - Replace the event-emitter-based `Runtime` with a simpler `Engine`/`Process` model (`pkg/engine`). - Add generic `Codec[T, U]` and `Marshaler[T]` interfaces (`pkg/codec`). - Merge `saccharine/token` sub-package into `saccharine` and rename scanner functions from `parse*` to `scan*`. - Make saccharine-to-lambda conversion bidirectional (encode and decode). - Add `lambda.Marshaler` and `saccharine.Marshaler` implementing `codec.Marshaler`. - Remove old infrastructure: `pkg/runtime`, `pkg/expr`, `internal/plugins`, `internal/statistics`. - Add `make lint` target and update golangci-lint config. ### Decisions - Cobra was chosen for the CLI framework to support nested subcommands and standard flag handling. - The registry uses BFS to find conversion paths between representations, allowing multi-hop conversions without hardcoding routes. - Type erasure via `cli.Repr` (wrapping `any`) enables the registry to work with heterogeneous types while keeping `pkg/` generics type-safe. - The old plugin/event system was removed entirely rather than adapted, since the new `Process` model can support hooks differently in the future. ## Benefits - Subcommands make the CLI self-documenting and easier to extend with new functionality. - The registry pattern decouples representations, conversions, and engines, making it trivial to add new ones. - BFS conversion routing means adding a single codec automatically enables transitive conversions. - Simpler `Engine`/`Process` model reduces complexity compared to the event-emitter runtime. - Consolidating the `token` sub-package reduces import depth and package sprawl. ## Checklist - [x] Code follows conventional commit format. - [x] Branch follows naming convention (`<type>/<description>`). Always use underscores. - [ ] Tests pass (if applicable). - [ ] Documentation updated (if applicable). Reviewed-on: #41 Co-authored-by: M.V. Hutz <git@maximhutz.me> Co-committed-by: M.V. Hutz <git@maximhutz.me>
43 lines
703 B
Go
43 lines
703 B
Go
package normalorder
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import (
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"git.maximhutz.com/max/lambda/pkg/engine"
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"git.maximhutz.com/max/lambda/pkg/lambda"
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)
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type Process struct {
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expr lambda.Expression
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}
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func (e Process) Get() (lambda.Expression, error) {
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return e.expr, nil
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}
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func (e *Process) Set(l lambda.Expression) error {
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e.expr = l
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return nil
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}
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func (e *Process) Step(i int) bool {
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for range i {
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next, reduced := ReduceOnce(e.expr)
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if !reduced {
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return false
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}
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e.expr = next
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}
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return true
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}
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type Engine struct {
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}
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func (e Engine) Load() engine.Process[lambda.Expression] {
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return &Process{}
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}
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var _ engine.Process[lambda.Expression] = (*Process)(nil)
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var _ engine.Engine[lambda.Expression] = (*Engine)(nil)
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