76 lines
2.5 KiB
TypeScript
76 lines
2.5 KiB
TypeScript
/* A Dispatcher is a collection of operations that do run-time
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* dispatch on the types of their arguments. Thus, every individual
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* method is like a typed-function (from the library by that name),
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* but they can depend on one another and on ona another's implementations
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* for specific types (including their own).
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*/
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// First helper types and functions for the Dispatcher
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type TypeName = string
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type Parameter = TypeName
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type Signature = Parameter[]
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type DependenciesType = Record<string, Function>
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// A "canned" dependency for a builtin function:
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export type typeOfDependency = {typeOf: (x: unknown) => TypeName}
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// Utility needed in type definitions
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//dummy implementation for now
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export function joinTypes(a: TypeName, b: TypeName) {
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if (a === b) return a
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return 'any'
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}
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// Now types used in the Dispatcher class itself
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type TypeSpecification = {
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before?: TypeName[],
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test: ((x: unknown) => boolean)
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| ((d: DependenciesType) => (x: unknown) => boolean),
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from: Record<TypeName, Function>,
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infer?: (d: DependenciesType) => (z: unknown) => TypeName
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}
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type SpecObject = Record<string, Function | TypeSpecification>
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type SpecificationsGroup = Record<string, SpecObject>
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export class Dispatcher {
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installSpecification(
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name: string,
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signature: Signature,
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returns: TypeName,
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dependencies: Record<string, Signature>,
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behavior: Function // possible todo: constrain this type based
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// on the signature, return type, and dependencies. Not sure if
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// that's really possible, though.
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) {
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console.log('Pretending to install', name, signature, '=>', returns)
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//TODO: implement me
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}
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installType(name: TypeName, typespec: TypeSpecification) {
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console.log('Pretending to install type', name, typespec)
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//TODO: implement me
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}
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constructor(collection: SpecificationsGroup) {
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for (const key in collection) {
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console.log('Working on', key)
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for (const identifier in collection[key]) {
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console.log('Handling', key, ':', identifier)
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const parts = identifier.split('_')
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if (parts[parts.length - 1] === 'type') {
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parts.pop()
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const name = parts.join('_')
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this.installType(
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name, collection[key][identifier] as TypeSpecification)
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} else {
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const name = parts[0]
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this.installSpecification(
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name, ['dunno'], 'unsure', {},
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collection[key][identifier] as Function)
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}
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}
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}
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}
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}
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