wip: experiment: field validation V2

Goal: validate a field based both on the on the validity of its keys
but also on parent-child relationships

Author: GregoryAlbouy

src/benchttp/field/core/validator.ts

@@ -0,0 +1,73 @@
+import { Nullable } from '@/typing/nullable'
+import {
+  isHTTPCodeKey,
+  isIndexKey,
+  isQuantileKey,
+  isRootKey,
+  isStatisticsKey,
+} from './key'
+
+type FieldValidator =
+  | RootFieldValidator
+  | StatisticsFieldValidator
+  | QuantileFieldValidator
+  | HTTPCodeFieldValidator
+  | IndexFieldValidator
+
+type FieldClass =
+  | typeof RootFieldValidator
+  | typeof StatisticsFieldValidator
+  | typeof QuantileFieldValidator
+  | typeof HTTPCodeFieldValidator
+  | typeof IndexFieldValidator
+
+interface IFieldValidator {
+  keyValidator: (key: string) => boolean
+  childValidators: FieldClass[]
+}
+
+abstract class AbstractFieldValidator implements IFieldValidator {
+  key: string
+  child: Nullable<FieldValidator>
+
+  constructor({ child, key }: Pick<AbstractFieldValidator, 'key' | 'child'>) {
+    this.child = child
+    this.key = key
+  }
+
+  abstract keyValidator: IFieldValidator['keyValidator']
+
+  abstract childValidators: IFieldValidator['childValidators']
+
+  public readonly isValid = (): boolean =>
+    this.keyValidator(this.key) && this.hasValidChild()
+
+  private hasValidChild = (): boolean =>
+    !this.child ||
+    this.childValidators.some((Allowed) => this.child instanceof Allowed)
+}
+
+export class QuantileFieldValidator extends AbstractFieldValidator {
+  keyValidator = isQuantileKey
+  childValidators = [IndexFieldValidator]
+}
+
+export class StatisticsFieldValidator extends AbstractFieldValidator {
+  keyValidator = isStatisticsKey
+  childValidators = [QuantileFieldValidator]
+}
+
+export class RootFieldValidator extends AbstractFieldValidator {
+  keyValidator = isRootKey
+  childValidators = [StatisticsFieldValidator]
+}
+
+export class IndexFieldValidator extends AbstractFieldValidator {
+  keyValidator = isIndexKey
+  childValidators = []
+}
+
+export class HTTPCodeFieldValidator extends AbstractFieldValidator {
+  keyValidator = isHTTPCodeKey
+  childValidators = [IndexFieldValidator]
+}