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✏️ Editing: HookCodeFactory.js

/*
	MIT License http://www.opensource.org/licenses/mit-license.php
	Author Tobias Koppers @sokra
*/
"use strict";

class HookCodeFactory {
	constructor(config) {
		this.config = config;
		this.options = undefined;
		this._args = undefined;
	}

create(options) {
		this.init(options);
		let fn;
		switch (this.options.type) {
			case "sync":
				fn = new Function(
					this.args(),
					`"use strict";\n${this.header()}${this.contentWithInterceptors({
						onError: (err) => `throw ${err};\n`,
						onResult: (result) => `return ${result};\n`,
						resultReturns: true,
						onDone: () => "",
						rethrowIfPossible: true
					})}`
				);
				break;
			case "async":
				fn = new Function(
					this.args({
						after: "_callback"
					}),
					`"use strict";\n${this.header()}${this.contentWithInterceptors({
						onError: (err) => `_callback(${err});\n`,
						onResult: (result) => `_callback(null, ${result});\n`,
						onDone: () => "_callback();\n"
					})}`
				);
				break;
			case "promise": {
				let errorHelperUsed = false;
				const content = this.contentWithInterceptors({
					onError: (err) => {
						errorHelperUsed = true;
						return `_error(${err});\n`;
					},
					onResult: (result) => `_resolve(${result});\n`,
					onDone: () => "_resolve();\n"
				});
				let code = "";
				code += '"use strict";\n';
				code += this.header();
				code += "return new Promise((function(_resolve, _reject) {\n";
				if (errorHelperUsed) {
					code += "var _sync = true;\n";
					code += "function _error(_err) {\n";
					code += "if(_sync)\n";
					code +=
						"_resolve(Promise.resolve().then((function() { throw _err; })));\n";
					code += "else\n";
					code += "_reject(_err);\n";
					code += "};\n";
				}
				code += content;
				if (errorHelperUsed) {
					code += "_sync = false;\n";
				}
				code += "}));\n";
				fn = new Function(this.args(), code);
				break;
			}
		}
		this.deinit();
		return fn;
	}

setup(instance, options) {
		instance._x = options.taps.map((t) => t.fn);
	}

/**
	 * @param {{ type: "sync" | "promise" | "async", taps: Array<Tap>, interceptors: Array<Interceptor> }} options
	 */
	init(options) {
		this.options = options;
		this._args = [...options.args];
	}

deinit() {
		this.options = undefined;
		this._args = undefined;
	}

contentWithInterceptors(options) {
		if (this.options.interceptors.length > 0) {
			const { onError, onResult, onDone } = options;
			let code = "";
			for (let i = 0; i < this.options.interceptors.length; i++) {
				const interceptor = this.options.interceptors[i];
				if (interceptor.call) {
					code += `${this.getInterceptor(i)}.call(${this.args({
						before: interceptor.context ? "_context" : undefined
					})});\n`;
				}
			}
			code += this.content(
				Object.assign(options, {
					onError:
						onError &&
						((err) => {
							let code = "";
							for (let i = 0; i < this.options.interceptors.length; i++) {
								const interceptor = this.options.interceptors[i];
								if (interceptor.error) {
									code += `${this.getInterceptor(i)}.error(${err});\n`;
								}
							}
							code += onError(err);
							return code;
						}),
					onResult:
						onResult &&
						((result) => {
							let code = "";
							for (let i = 0; i < this.options.interceptors.length; i++) {
								const interceptor = this.options.interceptors[i];
								if (interceptor.result) {
									code += `${this.getInterceptor(i)}.result(${result});\n`;
								}
							}
							code += onResult(result);
							return code;
						}),
					onDone:
						onDone &&
						(() => {
							let code = "";
							for (let i = 0; i < this.options.interceptors.length; i++) {
								const interceptor = this.options.interceptors[i];
								if (interceptor.done) {
									code += `${this.getInterceptor(i)}.done();\n`;
								}
							}
							code += onDone();
							return code;
						})
				})
			);
			return code;
		}
		return this.content(options);
	}

header() {
		let code = "";
		code += this.needContext() ? "var _context = {};\n" : "var _context;\n";
		code += "var _x = this._x;\n";
		if (this.options.interceptors.length > 0) {
			code += "var _taps = this.taps;\n";
			code += "var _interceptors = this.interceptors;\n";
		}
		return code;
	}

needContext() {
		for (const tap of this.options.taps) if (tap.context) return true;
		return false;
	}

callTap(tapIndex, { onError, onResult, onDone, rethrowIfPossible }) {
		let code = "";
		let hasTapCached = false;
		for (let i = 0; i < this.options.interceptors.length; i++) {
			const interceptor = this.options.interceptors[i];
			if (interceptor.tap) {
				if (!hasTapCached) {
					code += `var _tap${tapIndex} = ${this.getTap(tapIndex)};\n`;
					hasTapCached = true;
				}
				code += `${this.getInterceptor(i)}.tap(${
					interceptor.context ? "_context, " : ""
				}_tap${tapIndex});\n`;
			}
		}
		code += `var _fn${tapIndex} = ${this.getTapFn(tapIndex)};\n`;
		const tap = this.options.taps[tapIndex];
		switch (tap.type) {
			case "sync":
				if (!rethrowIfPossible) {
					code += `var _hasError${tapIndex} = false;\n`;
					code += "try {\n";
				}
				if (onResult) {
					code += `var _result${tapIndex} = _fn${tapIndex}(${this.args({
						before: tap.context ? "_context" : undefined
					})});\n`;
				} else {
					code += `_fn${tapIndex}(${this.args({
						before: tap.context ? "_context" : undefined
					})});\n`;
				}
				if (!rethrowIfPossible) {
					code += "} catch(_err) {\n";
					code += `_hasError${tapIndex} = true;\n`;
					code += onError("_err");
					code += "}\n";
					code += `if(!_hasError${tapIndex}) {\n`;
				}
				if (onResult) {
					code += onResult(`_result${tapIndex}`);
				}
				if (onDone) {
					code += onDone();
				}
				if (!rethrowIfPossible) {
					code += "}\n";
				}
				break;
			case "async": {
				let cbCode = "";
				cbCode += onResult
					? `(function(_err${tapIndex}, _result${tapIndex}) {\n`
					: `(function(_err${tapIndex}) {\n`;
				cbCode += `if(_err${tapIndex}) {\n`;
				cbCode += onError(`_err${tapIndex}`);
				cbCode += "} else {\n";
				if (onResult) {
					cbCode += onResult(`_result${tapIndex}`);
				}
				if (onDone) {
					cbCode += onDone();
				}
				cbCode += "}\n";
				cbCode += "})";
				code += `_fn${tapIndex}(${this.args({
					before: tap.context ? "_context" : undefined,
					after: cbCode
				})});\n`;
				break;
			}
			case "promise":
				code += `var _hasResult${tapIndex} = false;\n`;
				code += `var _promise${tapIndex} = _fn${tapIndex}(${this.args({
					before: tap.context ? "_context" : undefined
				})});\n`;
				code += `if (!_promise${tapIndex} || !_promise${tapIndex}.then)\n`;
				code += `  throw new Error('Tap function (tapPromise) did not return promise (returned ' + _promise${tapIndex} + ')');\n`;
				code += `_promise${tapIndex}.then((function(_result${tapIndex}) {\n`;
				code += `_hasResult${tapIndex} = true;\n`;
				if (onResult) {
					code += onResult(`_result${tapIndex}`);
				}
				if (onDone) {
					code += onDone();
				}
				code += `}), function(_err${tapIndex}) {\n`;
				code += `if(_hasResult${tapIndex}) throw _err${tapIndex};\n`;
				code += onError(
					`!_err${tapIndex} ? new Error('Tap function (tapPromise) rejects "' + _err${tapIndex} + '" value') : _err${tapIndex}`
				);
				code += "});\n";
				break;
		}
		return code;
	}

callTapsSeries({
		onError,
		onResult,
		resultReturns,
		onDone,
		doneReturns,
		rethrowIfPossible
	}) {
		if (this.options.taps.length === 0) return onDone();
		const firstAsync = this.options.taps.findIndex((t) => t.type !== "sync");
		const somethingReturns = resultReturns || doneReturns;
		let code = "";
		let current = onDone;
		let unrollCounter = 0;
		for (let j = this.options.taps.length - 1; j >= 0; j--) {
			const i = j;
			const unroll =
				current !== onDone &&
				(this.options.taps[i].type !== "sync" || unrollCounter++ > 20);
			if (unroll) {
				unrollCounter = 0;
				code += `function _next${i}() {\n`;
				code += current();
				code += "}\n";
				current = () => `${somethingReturns ? "return " : ""}_next${i}();\n`;
			}
			const done = current;
			const doneBreak = (skipDone) => {
				if (skipDone) return "";
				return onDone();
			};
			const content = this.callTap(i, {
				onError: (error) => onError(i, error, done, doneBreak),
				onResult:
					onResult && ((result) => onResult(i, result, done, doneBreak)),
				onDone: !onResult && done,
				rethrowIfPossible:
					rethrowIfPossible && (firstAsync < 0 || i < firstAsync)
			});
			current = () => content;
		}
		code += current();
		return code;
	}

callTapsLooping({ onError, onDone, rethrowIfPossible }) {
		if (this.options.taps.length === 0) return onDone();
		const syncOnly = this.options.taps.every((t) => t.type === "sync");
		let code = "";
		if (!syncOnly) {
			code += "var _looper = (function() {\n";
			code += "var _loopAsync = false;\n";
		}
		code += "var _loop;\n";
		code += "do {\n";
		code += "_loop = false;\n";
		for (let i = 0; i < this.options.interceptors.length; i++) {
			const interceptor = this.options.interceptors[i];
			if (interceptor.loop) {
				code += `${this.getInterceptor(i)}.loop(${this.args({
					before: interceptor.context ? "_context" : undefined
				})});\n`;
			}
		}
		code += this.callTapsSeries({
			onError,
			onResult: (i, result, next, doneBreak) => {
				let code = "";
				code += `if(${result} !== undefined) {\n`;
				code += "_loop = true;\n";
				if (!syncOnly) code += "if(_loopAsync) _looper();\n";
				code += doneBreak(true);
				code += "} else {\n";
				code += next();
				code += "}\n";
				return code;
			},
			onDone:
				onDone &&
				(() => {
					let code = "";
					code += "if(!_loop) {\n";
					code += onDone();
					code += "}\n";
					return code;
				}),
			rethrowIfPossible: rethrowIfPossible && syncOnly
		});
		code += "} while(_loop);\n";
		if (!syncOnly) {
			code += "_loopAsync = true;\n";
			code += "});\n";
			code += "_looper();\n";
		}
		return code;
	}

callTapsParallel({
		onError,
		onResult,
		onDone,
		rethrowIfPossible,
		onTap = (i, run) => run()
	}) {
		if (this.options.taps.length <= 1) {
			return this.callTapsSeries({
				onError,
				onResult,
				onDone,
				rethrowIfPossible
			});
		}
		let code = "";
		code += "do {\n";
		code += `var _counter = ${this.options.taps.length};\n`;
		if (onDone) {
			code += "var _done = (function() {\n";
			code += onDone();
			code += "});\n";
		}
		for (let i = 0; i < this.options.taps.length; i++) {
			const done = () => {
				if (onDone) return "if(--_counter === 0) _done();\n";
				return "--_counter;";
			};
			const doneBreak = (skipDone) => {
				if (skipDone || !onDone) return "_counter = 0;\n";
				return "_counter = 0;\n_done();\n";
			};
			code += "if(_counter <= 0) break;\n";
			code += onTap(
				i,
				() =>
					this.callTap(i, {
						onError: (error) => {
							let code = "";
							code += "if(_counter > 0) {\n";
							code += onError(i, error, done, doneBreak);
							code += "}\n";
							return code;
						},
						onResult:
							onResult &&
							((result) => {
								let code = "";
								code += "if(_counter > 0) {\n";
								code += onResult(i, result, done, doneBreak);
								code += "}\n";
								return code;
							}),
						onDone: !onResult && (() => done()),
						rethrowIfPossible
					}),
				done,
				doneBreak
			);
		}
		code += "} while(false);\n";
		return code;
	}

args({ before, after } = {}) {
		let allArgs = this._args;
		if (before) allArgs = [before, ...allArgs];
		if (after) allArgs = [...allArgs, after];
		if (allArgs.length === 0) {
			return "";
		}

return allArgs.join(", ");
	}

getTapFn(idx) {
		return `_x[${idx}]`;
	}

getTap(idx) {
		return `_taps[${idx}]`;
	}

getInterceptor(idx) {
		return `_interceptors[${idx}]`;
	}
}

module.exports = HookCodeFactory;

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