Split out rewrite.ts
This commit is contained in:
parent
b72fb6c309
commit
e23b93e913
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@ -1,6 +1,7 @@
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{
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"devDependencies": {
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"@types/node": "^14.14.31",
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"rollup": "^2.40.0",
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"typescript": "^4.1.5"
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},
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"dependencies": {
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@ -9,6 +10,8 @@
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"scripts": {
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"compile": "npx tsc",
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"compile:watch": "npx tsc -w",
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"clean": "rm -rf lib"
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"rollup": "npx rollup -c",
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"rollup:watch": "npx rollup -c -w",
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"clean": "rm -rf lib index.js"
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}
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}
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253
src/actor.ts
253
src/actor.ts
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@ -1,4 +1,5 @@
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import { Dictionary, IdentitySet, Record, Tuple, Value, is, IdentityMap } from 'preserves';
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import { Attenuation, runRewrites } from './rewrite.js';
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import { queueTask } from './task.js';
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//---------------------------------------------------------------------------
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@ -25,74 +26,6 @@ export interface Ref {
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readonly attenuation?: Attenuation;
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}
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export type Attenuation = Array<RewriteStage>; // array of stages, each a list of alternatives
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export type RewriteStage = Array<Rewrite>;
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export type Rewrite = { pattern: Pattern, template: Template };
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export const _CRec = Symbol.for('rec');
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export const CRec = Record.makeConstructor<{label: Value<never>, arity: number}, never>()(
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_CRec, ['label', 'arity']);
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export const _CArr = Symbol.for('arr');
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export const CArr = Record.makeConstructor<{arity: number}, never>()(
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_CArr, ['arity']);
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export const _CDict = Symbol.for('dict');
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export const CDict = Record.makeConstructor<{}, never>()(
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_CDict, []);
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export type ConstructorSpec =
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| Record<typeof _CRec, [Value<never>, number], never>
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| Record<typeof _CArr, [number], never>
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| Record<typeof _CDict, [], never>;
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export const _PDiscard = Symbol.for('_');
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export const PDiscard = Record.makeConstructor<{}, never>()(
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_PDiscard, []);
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export const _PBind = Symbol.for('bind');
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export const PBind = Record.makeConstructor<{name: string, pattern: Pattern}, never>()(
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_PBind, ['name', 'pattern']);
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export const _PAnd = Symbol.for('and');
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export const PAnd = Record.makeConstructor<{patterns: Array<Pattern>}, never>()(
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_PAnd, ['patterns']);
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export const _PNot = Symbol.for('not');
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export const PNot = Record.makeConstructor<{pattern: Pattern}, never>()(
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_PNot, ['pattern']);
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export const _Lit = Symbol.for('lit');
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export const Lit = Record.makeConstructor<{value: Value<never>}, never>()(
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_Lit, ['value']);
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export const _PCompound = Symbol.for('compound');
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export const PCompound =
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Record.makeConstructor<{ctor: ConstructorSpec, members: Dictionary<Pattern, never>}, never>()(
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_PCompound, ['ctor', 'members']);
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export type Pattern =
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| Record<typeof _PDiscard, [], never>
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| Record<typeof _PBind, [string, Pattern], never>
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| Record<typeof _PAnd, [Pattern[]], never>
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| Record<typeof _PNot, [Pattern], never>
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| Record<typeof _Lit, [Value<never>], never>
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| Record<typeof _PCompound, [ConstructorSpec, Dictionary<Pattern, never>], never>;
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export const _TRef = Symbol.for('ref');
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export const TRef = Record.makeConstructor<{name: string}, never>()(
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_TRef, ['name']);
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export const _TCompound = Symbol.for('compound');
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export const TCompound =
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Record.makeConstructor<{ctor: ConstructorSpec, members: Dictionary<Template, never>}, never>()(
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_TCompound, ['ctor', 'members']);
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export type Template =
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| Record<typeof _TRef, [string], never>
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| Record<typeof _Lit, [Value<never>], never>
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| Record<typeof _TCompound, [ConstructorSpec, Dictionary<Template, never>], never>;
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export type Bindings = { [name: string]: Assertion };
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//---------------------------------------------------------------------------
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@ -133,9 +66,6 @@ export class Actor {
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}
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let nextHandle = 0;
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function allocateHandle(): Handle {
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return nextHandle++;
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}
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export function _sync_impl(turn: Turn, e: Partial<Entity>, peer: Ref): void {
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e.sync ? e.sync!(turn, peer) : turn.message(peer, true);
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@ -188,7 +118,7 @@ export class Turn {
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}
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assert(ref: Ref, assertion: Assertion): Handle {
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const h = allocateHandle();
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const h = nextHandle++;
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this._assert(ref, assertion, h);
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return h;
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}
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@ -251,182 +181,3 @@ export class Turn {
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Turn.for(this.actor, a);
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}
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}
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//---------------------------------------------------------------------------
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export function match(p: Pattern, v: Assertion): Bindings | null {
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let bindings: Bindings = {};
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function walk(p: Pattern, v: Assertion): boolean {
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switch (p.label) {
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case _PDiscard:
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return true;
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case _PBind:
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if (walk(PBind._.pattern(p), v)) {
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bindings[PBind._.name(p)] = v;
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return true;
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}
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return false;
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case _PAnd:
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for (const pp of PAnd._.patterns(p)) {
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if (!walk(pp, v)) return false;
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}
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return true;
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case _PNot: {
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const savedBindings = bindings;
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bindings = {};
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const result = !walk(PNot._.pattern(p), v)
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bindings = savedBindings;
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return result;
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}
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case _Lit:
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return is(Lit._.value(p), v);
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case _PCompound: {
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const ctor = PCompound._.ctor(p);
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const members = PCompound._.members(p);
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switch (ctor.label) {
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case _CRec:
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if (!Record.isRecord<Assertion, Tuple<Assertion>, Ref>(v)) return false;
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if (!is(CRec._.label(ctor), v.label)) return false;
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if (CRec._.arity(ctor) !== v.length) return false;
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for (const [key, pp] of members) {
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if (typeof key !== 'number') return false;
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if (!walk(pp, v[key])) return false;
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}
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return true;
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case _CArr:
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if (!Array.isArray(v)) return false;
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if ('label' in v) return false;
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if (CArr._.arity(ctor) !== v.length) return false;
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for (const [key, pp] of members) {
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if (typeof key !== 'number') return false;
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if (!walk(pp, v[key])) return false;
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}
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return true;
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case _CDict:
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if (!Dictionary.isDictionary<Assertion, Ref>(v)) return false;
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for (const [key, pp] of members) {
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const vv = v.get(key as Assertion);
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if (vv === void 0) return false;
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if (!walk(pp, vv)) return false;
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}
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return true;
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}
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}
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}
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}
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return walk(p, v) ? bindings : null;
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}
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export function instantiate(t: Template, b: Bindings): Assertion {
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function walk(t: Template): Assertion {
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switch (t.label) {
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case _TRef: {
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const v = b[TRef._.name(t)];
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if (v === void 0) throw new Error(`Unbound reference: ${TRef._.name(t)}`);
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return v;
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}
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case _Lit:
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return Lit._.value(t) as Assertion;
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case _TCompound: {
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const ctor = TCompound._.ctor(t);
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const members = TCompound._.members(t);
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switch (ctor.label) {
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case _CRec: {
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const v = Record<Assertion, any, Ref>(
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CRec._.label(ctor) as Assertion,
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[],
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);
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v.length = CRec._.arity(ctor);
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for (const [key, tt] of members) {
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v[key as number] = walk(tt);
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}
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return v;
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}
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case _CArr: {
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const v = [];
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v.length = CArr._.arity(ctor);
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for (const [key, tt] of members) {
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v[key as number] = walk(tt);
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}
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return v;
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}
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case _CDict: {
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const v = new Dictionary<Assertion, Ref>();
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for (const [key, tt] of members) {
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v.set(key as Assertion, walk(tt));
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}
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return v;
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}
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}
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}
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}
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}
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return walk(t);
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}
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export function rewrite(r: Rewrite, v: Assertion): Assertion | null {
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const bindings = match(r.pattern, v);
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if (bindings === null) return null;
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return instantiate(r.template, bindings);
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}
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export function examineAlternatives(alternatives: RewriteStage, v: Assertion): Assertion | null {
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for (const r of alternatives) {
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const w = rewrite(r, v);
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if (w !== null) return w;
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}
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return null;
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}
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export function runRewrites(a: Attenuation | undefined, v: Assertion): Assertion | null {
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if (a !== void 0) {
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for (const stage of a) {
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const w = examineAlternatives(stage, v);
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if (w === null) return null;
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v = w;
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}
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}
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return v;
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}
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export function rfilter(... patterns: Pattern[]): RewriteStage {
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return patterns.map(p => ({ pattern: PBind('a', p), template: TRef('a') }));
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}
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export function attenuate(ref: Ref, ... a: Attenuation): Ref {
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return { ... ref, attenuation: [... a, ... (ref.attenuation ?? [])] };
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}
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export function forwarder(t: Turn, ref: Ref): { proxy: Ref, revoker: Ref } {
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let underlying: Ref | null = ref;
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let handleMap = new IdentityMap<Handle, Handle>();
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let proxy = t.ref({
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assert(turn: Turn, assertion: Assertion, handle: Handle): void {
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if (underlying === null) return;
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handleMap.set(handle, turn.assert(underlying, assertion));
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},
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retract(turn: Turn, handle: Handle): void {
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if (underlying === null) return;
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turn.retract(handleMap.get(handle));
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handleMap.delete(handle);
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},
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message(turn: Turn, body: Assertion): void {
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if (underlying === null) return;
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turn.message(underlying, body);
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},
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sync(turn: Turn, peer: Ref): void {
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if (underlying === null) return;
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turn._sync(underlying, peer);
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},
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});
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let revoker = t.ref({
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message(turn: Turn, _body: Assertion): void {
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underlying = null;
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handleMap.forEach(h => turn.retract(h));
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},
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});
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return { proxy, revoker };
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}
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@ -1,9 +1,10 @@
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import { Actor, Assertion, attenuate, CRec, Lit, Pattern, PCompound, rfilter, Turn } from './actor.js';
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import { Actor, Assertion, Turn } from './actor.js';
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import { Dictionary, Record } from 'preserves';
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import { Dataspace, Observe } from './dataspace.js';
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import { Worker } from 'worker_threads';
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import { Relay, spawnRelay } from './relay.js';
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import { BoxState, SetBox } from './box-protocol.js';
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import { attenuate, CRec, Lit, Pattern, PCompound, rfilter } from './rewrite.js';
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import path from 'path';
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const Instance = Record.makeConstructor<{moduleName: string, arg: Assertion}>()(
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@ -1,4 +1,5 @@
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import { Attenuation, Handle, Pattern, Ref, Template } from './actor.js';
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import { Handle, Ref } from './actor.js';
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import { Attenuation, Pattern, Template } from './rewrite.js';
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import { Record, Value } from 'preserves';
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export const _Assert = Symbol.for('assert');
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|
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@ -1,4 +1,4 @@
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import { Actor, Assertion, attenuate, Entity, Handle, Ref, Turn } from './actor.js';
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import { Actor, Assertion, Entity, Handle, Ref, Turn } from './actor.js';
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import { BytesLike, canonicalString, Decoder, encode, FlexMap, IdentityMap, mapPointers, underlying, Value } from 'preserves';
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import {
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EncodedAttenuation,
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@ -18,6 +18,7 @@ import {
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yourRef,
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} from './protocol.js';
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import { queueTask } from './task.js';
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import { attenuate } from './rewrite.js';
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export class SyncPeerEntity implements Entity {
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readonly relay: Relay;
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|
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@ -0,0 +1,247 @@
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import type { Assertion, Bindings, Handle, Ref, Turn } from "./actor.js";
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import { Dictionary, IdentityMap, is, Record, Tuple, Value } from "preserves";
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export type Attenuation = Array<RewriteStage>; // array of stages, each a list of alternatives
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export type RewriteStage = Array<Rewrite>;
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export type Rewrite = { pattern: Pattern, template: Template };
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export const _CRec = Symbol.for('rec');
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export const CRec = Record.makeConstructor<{label: Value<never>, arity: number}, never>()(
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_CRec, ['label', 'arity']);
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export const _CArr = Symbol.for('arr');
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export const CArr = Record.makeConstructor<{arity: number}, never>()(
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_CArr, ['arity']);
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export const _CDict = Symbol.for('dict');
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export const CDict = Record.makeConstructor<{}, never>()(
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_CDict, []);
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export type ConstructorSpec =
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| Record<typeof _CRec, [Value<never>, number], never>
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| Record<typeof _CArr, [number], never>
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| Record<typeof _CDict, [], never>;
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export const _PDiscard = Symbol.for('_');
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export const PDiscard = Record.makeConstructor<{}, never>()(
|
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_PDiscard, []);
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export const _PBind = Symbol.for('bind');
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export const PBind = Record.makeConstructor<{name: string, pattern: Pattern}, never>()(
|
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_PBind, ['name', 'pattern']);
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|
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export const _PAnd = Symbol.for('and');
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export const PAnd = Record.makeConstructor<{patterns: Array<Pattern>}, never>()(
|
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_PAnd, ['patterns']);
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export const _PNot = Symbol.for('not');
|
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export const PNot = Record.makeConstructor<{pattern: Pattern}, never>()(
|
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_PNot, ['pattern']);
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export const _Lit = Symbol.for('lit');
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export const Lit = Record.makeConstructor<{value: Value<never>}, never>()(
|
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_Lit, ['value']);
|
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|
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export const _PCompound = Symbol.for('compound');
|
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export const PCompound =
|
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Record.makeConstructor<{ctor: ConstructorSpec, members: Dictionary<Pattern, never>}, never>()(
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_PCompound, ['ctor', 'members']);
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|
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export type Pattern =
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| Record<typeof _PDiscard, [], never>
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| Record<typeof _PBind, [string, Pattern], never>
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| Record<typeof _PAnd, [Pattern[]], never>
|
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| Record<typeof _PNot, [Pattern], never>
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| Record<typeof _Lit, [Value<never>], never>
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| Record<typeof _PCompound, [ConstructorSpec, Dictionary<Pattern, never>], never>;
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export const _TRef = Symbol.for('ref');
|
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export const TRef = Record.makeConstructor<{name: string}, never>()(
|
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_TRef, ['name']);
|
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|
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export const _TCompound = Symbol.for('compound');
|
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export const TCompound =
|
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Record.makeConstructor<{ctor: ConstructorSpec, members: Dictionary<Template, never>}, never>()(
|
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_TCompound, ['ctor', 'members']);
|
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|
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export type Template =
|
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| Record<typeof _TRef, [string], never>
|
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| Record<typeof _Lit, [Value<never>], never>
|
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| Record<typeof _TCompound, [ConstructorSpec, Dictionary<Template, never>], never>;
|
||||
|
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export function match(p: Pattern, v: Assertion): Bindings | null {
|
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let bindings: Bindings = {};
|
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|
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function walk(p: Pattern, v: Assertion): boolean {
|
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switch (p.label) {
|
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case _PDiscard:
|
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return true;
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case _PBind:
|
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if (walk(PBind._.pattern(p), v)) {
|
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bindings[PBind._.name(p)] = v;
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return true;
|
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}
|
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return false;
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case _PAnd:
|
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for (const pp of PAnd._.patterns(p)) {
|
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if (!walk(pp, v)) return false;
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}
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return true;
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case _PNot: {
|
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const savedBindings = bindings;
|
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bindings = {};
|
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const result = !walk(PNot._.pattern(p), v)
|
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bindings = savedBindings;
|
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return result;
|
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}
|
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case _Lit:
|
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return is(Lit._.value(p), v);
|
||||
case _PCompound: {
|
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const ctor = PCompound._.ctor(p);
|
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const members = PCompound._.members(p);
|
||||
switch (ctor.label) {
|
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case _CRec:
|
||||
if (!Record.isRecord<Assertion, Tuple<Assertion>, Ref>(v)) return false;
|
||||
if (!is(CRec._.label(ctor), v.label)) return false;
|
||||
if (CRec._.arity(ctor) !== v.length) return false;
|
||||
for (const [key, pp] of members) {
|
||||
if (typeof key !== 'number') return false;
|
||||
if (!walk(pp, v[key])) return false;
|
||||
}
|
||||
return true;
|
||||
case _CArr:
|
||||
if (!Array.isArray(v)) return false;
|
||||
if ('label' in v) return false;
|
||||
if (CArr._.arity(ctor) !== v.length) return false;
|
||||
for (const [key, pp] of members) {
|
||||
if (typeof key !== 'number') return false;
|
||||
if (!walk(pp, v[key])) return false;
|
||||
}
|
||||
return true;
|
||||
case _CDict:
|
||||
if (!Dictionary.isDictionary<Assertion, Ref>(v)) return false;
|
||||
for (const [key, pp] of members) {
|
||||
const vv = v.get(key as Assertion);
|
||||
if (vv === void 0) return false;
|
||||
if (!walk(pp, vv)) return false;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return walk(p, v) ? bindings : null;
|
||||
}
|
||||
|
||||
export function instantiate(t: Template, b: Bindings): Assertion {
|
||||
function walk(t: Template): Assertion {
|
||||
switch (t.label) {
|
||||
case _TRef: {
|
||||
const v = b[TRef._.name(t)];
|
||||
if (v === void 0) throw new Error(`Unbound reference: ${TRef._.name(t)}`);
|
||||
return v;
|
||||
}
|
||||
case _Lit:
|
||||
return Lit._.value(t) as Assertion;
|
||||
case _TCompound: {
|
||||
const ctor = TCompound._.ctor(t);
|
||||
const members = TCompound._.members(t);
|
||||
switch (ctor.label) {
|
||||
case _CRec: {
|
||||
const v = Record<Assertion, any, Ref>(
|
||||
CRec._.label(ctor) as Assertion,
|
||||
[],
|
||||
);
|
||||
v.length = CRec._.arity(ctor);
|
||||
for (const [key, tt] of members) {
|
||||
v[key as number] = walk(tt);
|
||||
}
|
||||
return v;
|
||||
}
|
||||
case _CArr: {
|
||||
const v = [];
|
||||
v.length = CArr._.arity(ctor);
|
||||
for (const [key, tt] of members) {
|
||||
v[key as number] = walk(tt);
|
||||
}
|
||||
return v;
|
||||
}
|
||||
case _CDict: {
|
||||
const v = new Dictionary<Assertion, Ref>();
|
||||
for (const [key, tt] of members) {
|
||||
v.set(key as Assertion, walk(tt));
|
||||
}
|
||||
return v;
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
return walk(t);
|
||||
}
|
||||
|
||||
export function rewrite(r: Rewrite, v: Assertion): Assertion | null {
|
||||
const bindings = match(r.pattern, v);
|
||||
if (bindings === null) return null;
|
||||
return instantiate(r.template, bindings);
|
||||
}
|
||||
|
||||
export function examineAlternatives(alternatives: RewriteStage, v: Assertion): Assertion | null {
|
||||
for (const r of alternatives) {
|
||||
const w = rewrite(r, v);
|
||||
if (w !== null) return w;
|
||||
}
|
||||
return null;
|
||||
}
|
||||
|
||||
export function runRewrites(a: Attenuation | undefined, v: Assertion): Assertion | null {
|
||||
if (a !== void 0) {
|
||||
for (const stage of a) {
|
||||
const w = examineAlternatives(stage, v);
|
||||
if (w === null) return null;
|
||||
v = w;
|
||||
}
|
||||
}
|
||||
return v;
|
||||
}
|
||||
|
||||
export function rfilter(... patterns: Pattern[]): RewriteStage {
|
||||
return patterns.map(p => ({ pattern: PBind('a', p), template: TRef('a') }));
|
||||
}
|
||||
|
||||
export function attenuate(ref: Ref, ... a: Attenuation): Ref {
|
||||
return { ... ref, attenuation: [... a, ... (ref.attenuation ?? [])] };
|
||||
}
|
||||
|
||||
export function forwarder(t: Turn, ref: Ref): { proxy: Ref, revoker: Ref } {
|
||||
let underlying: Ref | null = ref;
|
||||
let handleMap = new IdentityMap<Handle, Handle>();
|
||||
let proxy = t.ref({
|
||||
assert(turn: Turn, assertion: Assertion, handle: Handle): void {
|
||||
if (underlying === null) return;
|
||||
handleMap.set(handle, turn.assert(underlying, assertion));
|
||||
},
|
||||
retract(turn: Turn, handle: Handle): void {
|
||||
if (underlying === null) return;
|
||||
turn.retract(handleMap.get(handle));
|
||||
handleMap.delete(handle);
|
||||
},
|
||||
message(turn: Turn, body: Assertion): void {
|
||||
if (underlying === null) return;
|
||||
turn.message(underlying, body);
|
||||
},
|
||||
sync(turn: Turn, peer: Ref): void {
|
||||
if (underlying === null) return;
|
||||
turn._sync(underlying, peer);
|
||||
},
|
||||
});
|
||||
let revoker = t.ref({
|
||||
message(turn: Turn, _body: Assertion): void {
|
||||
underlying = null;
|
||||
handleMap.forEach(h => turn.retract(h));
|
||||
},
|
||||
});
|
||||
return { proxy, revoker };
|
||||
}
|
|
@ -9,7 +9,7 @@
|
|||
"declarationDir": "./lib",
|
||||
"esModuleInterop": true,
|
||||
"moduleResolution": "node",
|
||||
"module": "commonjs",
|
||||
"module": "esnext",
|
||||
"sourceMap": true,
|
||||
"strict": true
|
||||
},
|
||||
|
|
Loading…
Reference in New Issue