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improve parameter handling at runtime
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| import { | ||
| Parameter, | ||
| InvalidParameterPathError, | ||
| ParameterExpansionError, | ||
| UnknownParameterError, | ||
| } from './types'; | ||
|
|
||
| export class ParameterStore<Parameters extends Record<string, any> = {}> { | ||
| private readonly resolving: Set<string> = new Set(); | ||
|
|
||
| constructor( | ||
| private readonly parameters: Parameters, | ||
| ) {} | ||
|
|
||
| getAll(): Parameters { | ||
| return this.expandValue(this.parameters); | ||
| } | ||
|
|
||
| resolve<P extends string>(path: P, need?: true): Parameter<Parameters, P>; | ||
| resolve<P extends string>(path: P, need: false): Parameter<Parameters, P> | undefined; | ||
| resolve<P extends string>(path: P, need?: boolean): Parameter<Parameters, P> | undefined { | ||
| try { | ||
| return this.resolvePath(path); | ||
| } catch (e: unknown) { | ||
| if (e instanceof UnknownParameterError && need === false) { | ||
| return undefined; | ||
| } | ||
|
|
||
| throw e; | ||
| } | ||
| } | ||
|
|
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| expand(value: string, need?: true): string; | ||
| expand(value: string, need: false): string | undefined; | ||
| expand(value: string, need?: boolean): string | undefined { | ||
| try { | ||
| return this.expandString(value); | ||
| } catch (e: unknown) { | ||
| if (e instanceof UnknownParameterError && need === false) { | ||
| return undefined; | ||
| } | ||
|
|
||
| throw e; | ||
| } | ||
| } | ||
|
|
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| private resolvePath(path: string): any { | ||
| if (this.resolving.has(path)) { | ||
| throw new ParameterExpansionError(`Cannot resolve parameter '${path}': cyclic parameter dependency detected`); | ||
| } | ||
|
|
||
| const tokens = path.split(/\./g); | ||
| let cursor: any = this.parameters; | ||
|
|
||
| for (let i = 0; i < tokens.length; ++i) { | ||
| const token = tokens[i]; | ||
|
|
||
| if (typeof cursor !== 'object' || cursor === null) { | ||
| throw new InvalidParameterPathError(tokens.slice(0, i).join('.')); | ||
| } | ||
|
|
||
| if (!(token in cursor)) { | ||
| throw new UnknownParameterError(tokens.slice(0, i).join('.')); | ||
| } | ||
|
|
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| cursor = cursor[token]; | ||
| } | ||
|
|
||
| try { | ||
| this.resolving.add(path); | ||
| return this.expandValue(cursor); | ||
| } finally { | ||
| this.resolving.delete(path); | ||
| } | ||
| } | ||
|
|
||
| private expandString(value: string): string { | ||
| return value.replace(/%([a-z0-9_.]+)%/gi, (_, path) => this.resolvePath(path)); | ||
| } | ||
|
|
||
| private expandValue(value: any): any { | ||
| const type = typeof value; | ||
|
|
||
| if (type === 'string') { | ||
| return this.expandString(value); | ||
| } | ||
|
|
||
| if (Array.isArray(value)) { | ||
| return value.map((v) => this.expandValue(v)); | ||
| } | ||
|
|
||
| if (type !== 'object' || value === null) { | ||
| return value; | ||
| } | ||
|
|
||
| return Object.fromEntries(Object.entries(value).map(([k, v]) => [k, this.expandValue(v)])); | ||
| } | ||
| } |
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