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>
92 lines
2.4 KiB
Go
92 lines
2.4 KiB
Go
package saccharine
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import "fmt"
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// All tokens in the pseudo-lambda language.
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type TokenType int
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const (
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TokenOpenParen TokenType = iota // Denotes the '(' token.
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TokenCloseParen // Denotes the ')' token.
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TokenOpenBrace // Denotes the '{' token.
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TokenCloseBrace // Denotes the '}' token.
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TokenHardBreak // Denotes the ';' token.
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TokenAssign // Denotes the ':=' token.
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TokenAtom // Denotes an alpha-numeric variable.
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TokenSlash // Denotes the '/' token.
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TokenDot // Denotes the '.' token.
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TokenSoftBreak // Denotes a new-line.
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)
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// A representation of a token in source code.
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type Token struct {
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Column int // Where the token begins in the source text.
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Type TokenType // What type the token is.
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Value string // The value of the token.
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}
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func NewTokenOpenParen(column int) *Token {
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return &Token{Type: TokenOpenParen, Column: column, Value: "("}
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}
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func NewTokenCloseParen(column int) *Token {
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return &Token{Type: TokenCloseParen, Column: column, Value: ")"}
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}
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func NewTokenOpenBrace(column int) *Token {
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return &Token{Type: TokenOpenBrace, Column: column, Value: "{"}
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}
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func NewTokenCloseBrace(column int) *Token {
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return &Token{Type: TokenCloseBrace, Column: column, Value: "}"}
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}
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func NewTokenDot(column int) *Token {
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return &Token{Type: TokenDot, Column: column, Value: "."}
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}
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func NewTokenHardBreak(column int) *Token {
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return &Token{Type: TokenHardBreak, Column: column, Value: ";"}
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}
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func NewTokenAssign(column int) *Token {
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return &Token{Type: TokenAssign, Column: column, Value: ":="}
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}
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func NewTokenSlash(column int) *Token {
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return &Token{Type: TokenSlash, Column: column, Value: "\\"}
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}
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func NewTokenAtom(name string, column int) *Token {
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return &Token{Type: TokenAtom, Column: column, Value: name}
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}
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func NewTokenSoftBreak(column int) *Token {
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return &Token{Type: TokenSoftBreak, Column: column, Value: "\\n"}
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}
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func (t TokenType) Name() string {
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switch t {
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case TokenOpenParen:
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return "("
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case TokenCloseParen:
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return ")"
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case TokenSlash:
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return "\\"
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case TokenDot:
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return "."
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case TokenAtom:
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return "ATOM"
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case TokenSoftBreak:
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return "\\n"
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case TokenHardBreak:
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return ";"
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default:
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panic(fmt.Errorf("unknown token type %v", t))
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}
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}
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func (t Token) Name() string {
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return t.Type.Name()
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}
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