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type COp = { op: string; a: Op; b: Op }
export type Op = string | COp;
export type OpToStr<O extends Op> =
O extends string
? O
: O extends { op: string, a: infer a extends string, b: infer b extends string } ? `(${a} ${O['op']} ${b})`
: O extends { op: string, a: infer a extends COp, b: infer b extends string } ? `(${OpToStr<a>} ${O['op']} ${b})`
: O extends { op: string, a: infer a extends string, b: infer b extends COp } ? `(${a} ${O['op']} ${OpToStr<b>})`
: O extends { op: string, a: infer a extends COp, b: infer b extends COp } ? `(${OpToStr<a>} ${O['op']} ${OpToStr<b>})`
: never;
type RwType = 'rewrite' | 'imperative';
export interface RewriteBase {
type: RwType;
left: Op;
right: Op;
assume?: Record<string, Op | RewriteBase>;
}
export interface Rewrite<left extends Op, right extends Op, Typ extends RwType = 'rewrite'> extends RewriteBase {
type: Typ;
left: left;
right: right;
};
export type Sym<R extends RewriteBase> = Rewrite<R['right'], R['left'], R['type']>;
export type Subst<A extends Op, B extends Op> = Rewrite<A, B>
export type ApplyRewrite<O extends Op, R extends RewriteBase> =
R['type'] extends 'imperative' ? (R & { left: O })['right']
: O extends R['left'] ? R['right']
: O extends string ? O
: O extends { a: Op, b: Op, op: string } ? (
ApplyRewrite<O['a'], R> extends O['a']
? (ApplyRewrite<O['b'], R> extends O['b'] ? O
: Omit<O, 'b'> & { b: ApplyRewrite<O['b'], R> })
: Omit<O, 'a'> & { a: ApplyRewrite<O['a'], R> }
)
: never;
export type ChainRewrites<Rws extends RewriteBase[], O extends Op> =
Rws extends [] ? O
: Rws extends [infer R extends RewriteBase, ...infer Rs extends RewriteBase[]]
? ChainRewrites<Rs, ApplyRewrite<O, R>>
: never;
export type VerifyEquation<Eq extends RewriteBase> =
Eq['right'] extends 'true' ? true : false & Eq['right'];
export type Evaluate<Eq extends RewriteBase> = ApplyRewrite<Eq['left'], Eq>;
export type assert<T extends true> = T;
export type assertFalse<T extends false> = T;
export type Eq<a, b> = ([a] extends [b] ? ([b] extends [a] ? true : false & { lhs: a; rhs: b }) : false & { lhs: a; rhs: b });
export type Equation<A extends Op, B extends Op> = { op: '=', a: A, b: B };
export interface Refl extends RewriteBase {
type: 'imperative';
left: Op;
right: this['left'] extends { op: '=', a: infer a, b: infer b }
? (Eq<a, b> extends true ? 'true' : this['left'])
: this['left'];
};
// Like Refl, but you have to specify the sides of the equation and this one works recursively
export type ReflR<A extends Op> = Rewrite<Equation<A, A>, 'true'>;
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