microsoft/typespec
Publicmirrored from https://github.com/microsoft/typespecAvailable
packages/asset-emitter/src/reference-cycle.ts
44lines · modecode
| 1 | import { getTypeName, type Type } from "@typespec/compiler"; |
| 2 | import type { EmitEntity } from "./types.js"; |
| 3 | |
| 4 | export interface ReferenceCycleEntry { |
| 5 | type: Type; |
| 6 | entity: EmitEntity<unknown>; |
| 7 | } |
| 8 | |
| 9 | /** |
| 10 | * Represent a reference cycle. |
| 11 | * The cycle entries will always start with a declaration if there is one in the cycle. |
| 12 | */ |
| 13 | export class ReferenceCycle implements Iterable<ReferenceCycleEntry> { |
| 14 | /** |
| 15 | * If this cycle contains a declaration. |
| 16 | */ |
| 17 | readonly containsDeclaration: boolean; |
| 18 | |
| 19 | #entries: ReferenceCycleEntry[]; |
| 20 | |
| 21 | constructor(entries: ReferenceCycleEntry[]) { |
| 22 | const firstDeclarationIndex = entries.findIndex((entry) => entry.entity.kind === "declaration"); |
| 23 | this.containsDeclaration = firstDeclarationIndex !== -1; |
| 24 | this.#entries = this.containsDeclaration |
| 25 | ? [...entries.slice(firstDeclarationIndex), ...entries.slice(0, firstDeclarationIndex)] |
| 26 | : entries; |
| 27 | } |
| 28 | |
| 29 | get first(): ReferenceCycleEntry { |
| 30 | return this.#entries[0]; |
| 31 | } |
| 32 | |
| 33 | [Symbol.iterator](): Iterator<ReferenceCycleEntry> { |
| 34 | return this.#entries[Symbol.iterator](); |
| 35 | } |
| 36 | |
| 37 | [Symbol.toStringTag](): string { |
| 38 | return [...this.#entries, this.#entries[0]].map((x) => getTypeName(x.type)).join(" -> "); |
| 39 | } |
| 40 | |
| 41 | toString(): string { |
| 42 | return this[Symbol.toStringTag](); |
| 43 | } |
| 44 | } |