microsoft/typespec
Publicmirrored from https://github.com/microsoft/typespecAvailable
packages/asset-emitter/src/ref-scope.ts
40lines · modecode
| 1 | import type { Declaration, Scope } from "./types.js"; |
| 2 | |
| 3 | export function scopeChain<T>(scope: Scope<T> | null) { |
| 4 | const chain = []; |
| 5 | while (scope) { |
| 6 | chain.unshift(scope); |
| 7 | scope = scope.parentScope; |
| 8 | } |
| 9 | |
| 10 | return chain; |
| 11 | } |
| 12 | |
| 13 | /** |
| 14 | * Resolve relative scopes between the current scope and the target declaration. |
| 15 | * @param target The target declaration |
| 16 | * @param currentScope Current scope |
| 17 | * @returns |
| 18 | */ |
| 19 | export function resolveDeclarationReferenceScope<T>( |
| 20 | target: Declaration<T>, |
| 21 | currentScope: Scope<T>, |
| 22 | ) { |
| 23 | const targetScope = target.scope; |
| 24 | const targetChain = scopeChain(targetScope); |
| 25 | const currentChain = scopeChain(currentScope); |
| 26 | let diffStart = 0; |
| 27 | while ( |
| 28 | targetChain[diffStart] && |
| 29 | currentChain[diffStart] && |
| 30 | targetChain[diffStart] === currentChain[diffStart] |
| 31 | ) { |
| 32 | diffStart++; |
| 33 | } |
| 34 | |
| 35 | const pathUp: Scope<T>[] = currentChain.slice(diffStart); |
| 36 | const pathDown: Scope<T>[] = targetChain.slice(diffStart); |
| 37 | |
| 38 | const commonScope = targetChain[diffStart - 1] ?? null; |
| 39 | return { pathUp, pathDown, commonScope }; |
| 40 | } |
| 41 | |