99 lines
2.7 KiB
TypeScript
99 lines
2.7 KiB
TypeScript
import { AbstractClass, Class } from "type-fest"
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import { Trait } from "./Trait"
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import { TraitExpression } from "./TraitExpression"
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import { StaticMembers } from "./util"
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export type TraitApplierSuperTag = "@thilawyn/traitify-ts/Super"
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export type RemoveAbstractFromImplClass<
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ImplClassWithAbstract extends (
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Class<Abstract, []> &
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StaticAbstract &
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{ _tag: TraitApplierSuperTag }
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),
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Abstract extends object,
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StaticAbstract extends object,
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> = (
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Class<
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Omit<InstanceType<ImplClassWithAbstract>, keyof Abstract>,
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ConstructorParameters<ImplClassWithAbstract>
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> &
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Omit<StaticMembers<ImplClassWithAbstract>, keyof StaticAbstract | "_tag">
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)
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export class TraitBuilder<
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SuperExpression extends TraitExpression<
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typeof TraitExpression.NullSuperclass,
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Trait<any, any, any, any>[]
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>,
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Abstract extends object,
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StaticAbstract extends object,
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ImplClass extends Class<object, []>,
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> {
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constructor(
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private readonly traitSuperExpression: SuperExpression,
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private readonly traitAbstract: Abstract,
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private readonly traitStaticAbstract: StaticAbstract,
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private readonly traitApply: (Super: AbstractClass<object>) => ImplClass,
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) {}
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abstract<A extends Abstract>() {
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return new TraitBuilder(
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this.traitSuperExpression,
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{} as A,
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this.traitStaticAbstract,
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this.traitApply,
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)
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}
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staticAbstract<A extends StaticAbstract>() {
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return new TraitBuilder(
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this.traitSuperExpression,
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this.traitAbstract,
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{} as A,
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this.traitApply,
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)
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}
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implement<
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ImplClassWithAbstract extends (
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Class<Abstract, []> &
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StaticAbstract &
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{ _tag: TraitApplierSuperTag }
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)
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>(
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apply: (
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Super: (
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AbstractClass<Abstract> &
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StaticAbstract &
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{ _tag: TraitApplierSuperTag }
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)
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) => ImplClassWithAbstract
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) {
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return new TraitBuilder(
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this.traitSuperExpression,
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this.traitAbstract,
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this.traitStaticAbstract,
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apply as unknown as (Super: AbstractClass<object>) => RemoveAbstractFromImplClass<ImplClassWithAbstract, Abstract, StaticAbstract>,
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)
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}
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build() {
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return new Trait(
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this.traitSuperExpression,
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this.traitAbstract,
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this.traitStaticAbstract,
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this.traitApply,
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)
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}
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}
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export const trait = new TraitBuilder(
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new TraitExpression(TraitExpression.NullSuperclass, []),
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{},
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{},
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Super => class extends Super {},
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)
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