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176 lines
4.5 KiB
176 lines
4.5 KiB
/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Tobias Koppers @sokra
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*/
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"use strict";
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class Hook {
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constructor(args) {
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if (!Array.isArray(args)) args = [];
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this._args = args;
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this.taps = [];
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this.interceptors = [];
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this.call = this._call;
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this.promise = this._promise;
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this.callAsync = this._callAsync;
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this._x = undefined;
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}
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compile(options) {
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throw new Error("Abstract: should be overriden");
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}
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_createCall(type) {
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return this.compile({
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taps: this.taps,
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interceptors: this.interceptors,
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args: this._args,
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type: type
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});
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}
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tap(options, fn) {
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if (typeof options === "string") options = { name: options };
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if (typeof options !== "object" || options === null)
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throw new Error(
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"Invalid arguments to tap(options: Object, fn: function)"
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);
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options = Object.assign({ type: "sync", fn: fn }, options);
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if (typeof options.name !== "string" || options.name === "")
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throw new Error("Missing name for tap");
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options = this._runRegisterInterceptors(options);
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this._insert(options);
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}
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tapAsync(options, fn) {
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if (typeof options === "string") options = { name: options };
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if (typeof options !== "object" || options === null)
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throw new Error(
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"Invalid arguments to tapAsync(options: Object, fn: function)"
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);
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options = Object.assign({ type: "async", fn: fn }, options);
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if (typeof options.name !== "string" || options.name === "")
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throw new Error("Missing name for tapAsync");
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options = this._runRegisterInterceptors(options);
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this._insert(options);
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}
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tapPromise(options, fn) {
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if (typeof options === "string") options = { name: options };
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if (typeof options !== "object" || options === null)
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throw new Error(
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"Invalid arguments to tapPromise(options: Object, fn: function)"
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);
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options = Object.assign({ type: "promise", fn: fn }, options);
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if (typeof options.name !== "string" || options.name === "")
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throw new Error("Missing name for tapPromise");
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options = this._runRegisterInterceptors(options);
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this._insert(options);
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}
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_runRegisterInterceptors(options) {
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for (const interceptor of this.interceptors) {
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if (interceptor.register) {
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const newOptions = interceptor.register(options);
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if (newOptions !== undefined) options = newOptions;
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}
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}
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return options;
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}
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withOptions(options) {
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const mergeOptions = opt =>
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Object.assign({}, options, typeof opt === "string" ? { name: opt } : opt);
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// Prevent creating endless prototype chains
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options = Object.assign({}, options, this._withOptions);
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const base = this._withOptionsBase || this;
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const newHook = Object.create(base);
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(newHook.tapAsync = (opt, fn) => base.tapAsync(mergeOptions(opt), fn)),
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(newHook.tap = (opt, fn) => base.tap(mergeOptions(opt), fn));
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newHook.tapPromise = (opt, fn) => base.tapPromise(mergeOptions(opt), fn);
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newHook._withOptions = options;
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newHook._withOptionsBase = base;
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return newHook;
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}
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isUsed() {
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return this.taps.length > 0 || this.interceptors.length > 0;
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}
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intercept(interceptor) {
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this._resetCompilation();
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this.interceptors.push(Object.assign({}, interceptor));
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if (interceptor.register) {
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for (let i = 0; i < this.taps.length; i++)
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this.taps[i] = interceptor.register(this.taps[i]);
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}
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}
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_resetCompilation() {
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this.call = this._call;
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this.callAsync = this._callAsync;
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this.promise = this._promise;
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}
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_insert(item) {
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this._resetCompilation();
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let before;
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if (typeof item.before === "string") before = new Set([item.before]);
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else if (Array.isArray(item.before)) {
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before = new Set(item.before);
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}
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let stage = 0;
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if (typeof item.stage === "number") stage = item.stage;
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let i = this.taps.length;
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while (i > 0) {
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i--;
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const x = this.taps[i];
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this.taps[i + 1] = x;
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const xStage = x.stage || 0;
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if (before) {
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if (before.has(x.name)) {
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before.delete(x.name);
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continue;
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}
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if (before.size > 0) {
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continue;
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}
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}
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if (xStage > stage) {
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continue;
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}
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i++;
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break;
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}
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this.taps[i] = item;
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}
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}
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function createCompileDelegate(name, type) {
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return function lazyCompileHook(...args) {
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this[name] = this._createCall(type);
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return this[name](...args);
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};
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}
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Object.defineProperties(Hook.prototype, {
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_call: {
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value: createCompileDelegate("call", "sync"),
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configurable: true,
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writable: true
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},
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_promise: {
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value: createCompileDelegate("promise", "promise"),
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configurable: true,
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writable: true
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},
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_callAsync: {
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value: createCompileDelegate("callAsync", "async"),
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configurable: true,
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writable: true
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}
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});
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module.exports = Hook;
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