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feat(core): improve alias validation (#2164)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,83 @@ | ||
| import { isScopedAliasDefinition, isSimpleAliasDefinition } from './utils/guards'; | ||
| import type { RulesetScopedAliasDefinition } from './types'; | ||
|
|
||
| const ALIAS = /^#([A-Za-z0-9_-]+)/; | ||
|
|
||
| export function resolveAliasForFormats( | ||
| { targets }: RulesetScopedAliasDefinition, | ||
| formats: Set<unknown> | null, | ||
| ): string[] | null { | ||
| if (formats === null || formats.size === 0) { | ||
| return null; | ||
| } | ||
|
|
||
| // we start from the end to be consistent with overrides etc. - we generally tend to pick the "last" value. | ||
| for (let i = targets.length - 1; i >= 0; i--) { | ||
| const target = targets[i]; | ||
| for (const format of target.formats) { | ||
| if (formats.has(format)) { | ||
| return target.given; | ||
| } | ||
| } | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
|
|
||
| export function resolveAlias( | ||
| aliases: Record<string, unknown> | null, | ||
| expression: string, | ||
| formats: Set<unknown> | null, | ||
| ): string[] { | ||
| return _resolveAlias(aliases, expression, formats, new Set()); | ||
| } | ||
|
|
||
| function _resolveAlias( | ||
| aliases: Record<string, unknown> | null, | ||
| expression: string, | ||
| formats: Set<unknown> | null, | ||
| stack: Set<string>, | ||
| ): string[] { | ||
| const resolvedExpressions: string[] = []; | ||
|
|
||
| if (expression.startsWith('#')) { | ||
| const alias = ALIAS.exec(expression)?.[1]; | ||
|
|
||
| if (alias === void 0 || alias === null) { | ||
| throw new ReferenceError(`Alias must match /^#([A-Za-z0-9_-]+)/`); | ||
| } | ||
|
|
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| if (stack.has(alias)) { | ||
| const _stack = [...stack, alias]; | ||
| throw new ReferenceError(`Alias "${_stack[0]}" is circular. Resolution stack: ${_stack.join(' -> ')}`); | ||
| } | ||
|
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| stack.add(alias); | ||
|
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| if (aliases === null || !(alias in aliases)) { | ||
| throw new ReferenceError(`Alias "${alias}" does not exist`); | ||
| } | ||
|
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||
| const aliasValue = aliases[alias]; | ||
| let actualAliasValue: string[] | null; | ||
| if (isSimpleAliasDefinition(aliasValue)) { | ||
| actualAliasValue = aliasValue; | ||
| } else if (isScopedAliasDefinition(aliasValue)) { | ||
| actualAliasValue = resolveAliasForFormats(aliasValue, formats); | ||
| } else { | ||
| actualAliasValue = null; | ||
| } | ||
|
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| if (actualAliasValue !== null) { | ||
| resolvedExpressions.push( | ||
| ...actualAliasValue.flatMap(item => | ||
| _resolveAlias(aliases, item + expression.slice(alias.length + 1), formats, new Set([...stack])), | ||
| ), | ||
| ); | ||
| } | ||
| } else { | ||
| resolvedExpressions.push(expression); | ||
| } | ||
|
|
||
| return resolvedExpressions; | ||
| } |
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