M.V. Hutz
9c7fb8ceba
## Description The codebase previously used "interpreter" terminology and standalone functions for expression operations. This PR modernizes the architecture by renaming to "runtime" and converting operations to receiver methods. - Rename `pkg/interpreter` to `pkg/runtime`. - Move `ReduceOnce` to new `pkg/normalorder` package for reduction strategy isolation. - Convert standalone functions (`Substitute`, `Rename`, `GetFree`, `IsFree`) to receiver methods on concrete expression types. - Change `Set` from pointer receivers to value receivers for simpler usage. - Update all references from "interpreter" to "runtime" terminology throughout the codebase. ### Decisions - Operations like `Substitute`, `Rename`, `GetFree`, and `IsFree` are now methods on the `Expression` interface, implemented by each concrete type (`Variable`, `Abstraction`, `Application`). - The `normalorder` package isolates the normal-order reduction strategy, allowing future reduction strategies to be added in separate packages. - `Set` uses value receivers since Go maps are reference types and don't require pointer semantics. ## Benefits - Cleaner API: `expr.Substitute(target, replacement)` instead of `Substitute(expr, target, replacement)`. - Better separation of concerns: reduction strategies are isolated from expression types. - Consistent terminology: "runtime" better reflects the execution model. - Simpler `Set` usage without needing to manage pointers. ## Checklist - [x] Code follows conventional commit format. - [x] Branch follows naming convention (`<type>/<description>`). Always use underscores. - [x] Tests pass (if applicable). - [x] Documentation updated (if applicable). Reviewed-on: #39 Co-authored-by: M.V. Hutz <git@maximhutz.me> Co-committed-by: M.V. Hutz <git@maximhutz.me>
28 lines
801 B
Go
28 lines
801 B
Go
// Package runtime provides the abstract Reducer interface for all expression
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// reduction strategies.
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package runtime
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import (
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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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)
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// Runtime defines the interface for expression reduction strategies.
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// Different evaluation modes (normal order, applicative order, SKI combinators,
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// etc.) implement this interface with their own reduction logic.
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//
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// Runtimes also implement the Emitter interface to allow plugins to observe
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// reduction lifecycle events (Start, Step, Stop).
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type Runtime interface {
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emitter.Emitter[Event]
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// Run a single step. Returns whether the runtime is complete or not.
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Step() bool
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// Run until completion.
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Run()
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// Copy the state of the runtime.
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Expression() expr.Expression
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}
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