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Add support for Options.functions (#86)
This is still missing support for some value types, but the function definition infrastructure is in place. See sass/sass#2510 Closes #72
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| // Copyright 2021 Google Inc. Use of this source code is governed by an | ||
| // MIT-style license that can be found in the LICENSE file or at | ||
| // https://opensource.org/licenses/MIT. | ||
|
|
||
| import {inspect} from 'util'; | ||
|
|
||
| import * as types from './vendor/sass'; | ||
| import * as utils from './utils'; | ||
| import {CustomFunction} from './vendor/sass'; | ||
| import { | ||
| InboundMessage, | ||
| OutboundMessage, | ||
| } from './vendor/embedded-protocol/embedded_sass_pb'; | ||
| import {PromiseOr, catchOr, thenOr} from './utils'; | ||
| import {Protofier} from './protofier'; | ||
| import {Value} from './value'; | ||
|
|
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| export class FunctionRegistry<sync extends 'sync' | 'async'> { | ||
| private readonly functionsByName = new Map<string, CustomFunction<sync>>(); | ||
| private readonly functionsById = new Array<CustomFunction<sync>>(); | ||
| private readonly idsByFunction = new Map<CustomFunction<sync>, number>(); | ||
|
|
||
| constructor(functionsBySignature?: Record<string, CustomFunction<sync>>) { | ||
| for (const [signature, fn] of Object.entries(functionsBySignature ?? {})) { | ||
| const openParen = signature.indexOf('('); | ||
| if (openParen === -1) { | ||
| throw new Error(`options.functions: "${signature}" is missing "("`); | ||
| } | ||
|
|
||
| this.functionsByName.set(signature.substring(0, openParen), fn); | ||
| } | ||
| } | ||
|
|
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| /** Registers `fn` as a function that can be called using the returned ID. */ | ||
| register(fn: CustomFunction<sync>): number { | ||
| return utils.putIfAbsent(this.idsByFunction, fn, () => { | ||
| const id = this.functionsById.length; | ||
| this.functionsById.push(fn); | ||
| return id; | ||
| }); | ||
| } | ||
|
|
||
| /** | ||
| * Returns the function to which `request` refers and returns its response. | ||
| */ | ||
| call( | ||
| request: OutboundMessage.FunctionCallRequest | ||
| ): PromiseOr<InboundMessage.FunctionCallResponse, sync> { | ||
| const protofier = new Protofier(); | ||
| const fn = this.get(request); | ||
|
|
||
| return catchOr( | ||
| () => { | ||
| return thenOr( | ||
| fn( | ||
| request | ||
| .getArgumentsList() | ||
| .map(value => protofier.deprotofy(value) as types.Value) | ||
| ), | ||
| result => { | ||
| if (!(result instanceof Value)) { | ||
| const name = | ||
| request.getName().length === 0 | ||
| ? 'anonymous function' | ||
| : `"${request.getName()}"`; | ||
| throw ( | ||
| `options.functions: ${name} returned non-Value: ` + | ||
| inspect(result) | ||
| ); | ||
| } | ||
|
|
||
| const response = new InboundMessage.FunctionCallResponse(); | ||
| response.setSuccess(protofier.protofy(result)); | ||
| return response; | ||
| } | ||
| ); | ||
| }, | ||
| error => { | ||
| const response = new InboundMessage.FunctionCallResponse(); | ||
| response.setError(`${error}`); | ||
| return response; | ||
| } | ||
| ); | ||
| } | ||
|
|
||
| /** Returns the function to which `request` refers. */ | ||
| private get( | ||
| request: OutboundMessage.FunctionCallRequest | ||
| ): CustomFunction<sync> { | ||
| if ( | ||
| request.getIdentifierCase() === | ||
| OutboundMessage.FunctionCallRequest.IdentifierCase.NAME | ||
| ) { | ||
| const fn = this.functionsByName.get(request.getName()); | ||
| if (fn) return fn; | ||
|
|
||
| throw new Error( | ||
| 'Invalid OutboundMessage.FunctionCallRequest: there is no function ' + | ||
| `named "${request.getName()}"` | ||
| ); | ||
| } else { | ||
| const fn = this.functionsById[request.getFunctionId()]; | ||
| if (fn) return fn; | ||
|
|
||
| throw new Error( | ||
| 'Invalid OutboundMessage.FunctionCallRequest: there is no function ' + | ||
| `with ID "${request.getFunctionId()}"` | ||
| ); | ||
| } | ||
| } | ||
| } |
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