| 1 | /*
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| 2 | MIT License http://www.opensource.org/licenses/mit-license.php
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| 3 | Author Tobias Koppers @sokra
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| 4 | */
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| 5 | "use strict";
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| 6 |
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| 7 | class HookCodeFactory {
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| 8 | constructor(config) {
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| 9 | this.config = config;
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| 10 | this.options = undefined;
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| 11 | this._args = undefined;
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| 12 | }
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| 13 |
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| 14 | create(options) {
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| 15 | this.init(options);
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| 16 | let fn;
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| 17 | switch (this.options.type) {
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| 18 | case "sync":
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| 19 | fn = new Function(
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| 20 | this.args(),
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| 21 | '"use strict";\n' +
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| 22 | this.header() +
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| 23 | this.contentWithInterceptors({
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| 24 | onError: err => `throw ${err};\n`,
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| 25 | onResult: result => `return ${result};\n`,
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| 26 | resultReturns: true,
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| 27 | onDone: () => "",
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| 28 | rethrowIfPossible: true
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| 29 | })
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| 30 | );
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| 31 | break;
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| 32 | case "async":
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| 33 | fn = new Function(
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| 34 | this.args({
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| 35 | after: "_callback"
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| 36 | }),
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| 37 | '"use strict";\n' +
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| 38 | this.header() +
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| 39 | this.contentWithInterceptors({
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| 40 | onError: err => `_callback(${err});\n`,
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| 41 | onResult: result => `_callback(null, ${result});\n`,
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| 42 | onDone: () => "_callback();\n"
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| 43 | })
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| 44 | );
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| 45 | break;
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| 46 | case "promise":
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| 47 | let errorHelperUsed = false;
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| 48 | const content = this.contentWithInterceptors({
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| 49 | onError: err => {
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| 50 | errorHelperUsed = true;
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| 51 | return `_error(${err});\n`;
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| 52 | },
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| 53 | onResult: result => `_resolve(${result});\n`,
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| 54 | onDone: () => "_resolve();\n"
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| 55 | });
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| 56 | let code = "";
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| 57 | code += '"use strict";\n';
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| 58 | code += this.header();
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| 59 | code += "return new Promise((function(_resolve, _reject) {\n";
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| 60 | if (errorHelperUsed) {
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| 61 | code += "var _sync = true;\n";
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| 62 | code += "function _error(_err) {\n";
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| 63 | code += "if(_sync)\n";
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| 64 | code +=
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| 65 | "_resolve(Promise.resolve().then((function() { throw _err; })));\n";
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| 66 | code += "else\n";
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| 67 | code += "_reject(_err);\n";
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| 68 | code += "};\n";
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| 69 | }
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| 70 | code += content;
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| 71 | if (errorHelperUsed) {
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| 72 | code += "_sync = false;\n";
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| 73 | }
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| 74 | code += "}));\n";
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| 75 | fn = new Function(this.args(), code);
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| 76 | break;
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| 77 | }
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| 78 | this.deinit();
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| 79 | return fn;
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| 80 | }
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| 81 |
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| 82 | setup(instance, options) {
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| 83 | instance._x = options.taps.map(t => t.fn);
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| 84 | }
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| 85 |
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| 86 | /**
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| 87 | * @param {{ type: "sync" | "promise" | "async", taps: Array<Tap>, interceptors: Array<Interceptor> }} options
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| 88 | */
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| 89 | init(options) {
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| 90 | this.options = options;
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| 91 | this._args = options.args.slice();
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| 92 | }
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| 93 |
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| 94 | deinit() {
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| 95 | this.options = undefined;
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| 96 | this._args = undefined;
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| 97 | }
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| 98 |
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| 99 | contentWithInterceptors(options) {
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| 100 | if (this.options.interceptors.length > 0) {
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| 101 | const onError = options.onError;
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| 102 | const onResult = options.onResult;
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| 103 | const onDone = options.onDone;
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| 104 | let code = "";
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| 105 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 106 | const interceptor = this.options.interceptors[i];
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| 107 | if (interceptor.call) {
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| 108 | code += `${this.getInterceptor(i)}.call(${this.args({
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| 109 | before: interceptor.context ? "_context" : undefined
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| 110 | })});\n`;
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| 111 | }
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| 112 | }
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| 113 | code += this.content(
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| 114 | Object.assign(options, {
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| 115 | onError:
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| 116 | onError &&
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| 117 | (err => {
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| 118 | let code = "";
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| 119 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 120 | const interceptor = this.options.interceptors[i];
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| 121 | if (interceptor.error) {
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| 122 | code += `${this.getInterceptor(i)}.error(${err});\n`;
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| 123 | }
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| 124 | }
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| 125 | code += onError(err);
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| 126 | return code;
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| 127 | }),
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| 128 | onResult:
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| 129 | onResult &&
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| 130 | (result => {
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| 131 | let code = "";
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| 132 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 133 | const interceptor = this.options.interceptors[i];
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| 134 | if (interceptor.result) {
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| 135 | code += `${this.getInterceptor(i)}.result(${result});\n`;
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| 136 | }
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| 137 | }
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| 138 | code += onResult(result);
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| 139 | return code;
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| 140 | }),
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| 141 | onDone:
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| 142 | onDone &&
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| 143 | (() => {
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| 144 | let code = "";
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| 145 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 146 | const interceptor = this.options.interceptors[i];
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| 147 | if (interceptor.done) {
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| 148 | code += `${this.getInterceptor(i)}.done();\n`;
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| 149 | }
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| 150 | }
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| 151 | code += onDone();
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| 152 | return code;
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| 153 | })
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| 154 | })
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| 155 | );
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| 156 | return code;
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| 157 | } else {
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| 158 | return this.content(options);
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| 159 | }
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| 160 | }
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| 161 |
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| 162 | header() {
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| 163 | let code = "";
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| 164 | if (this.needContext()) {
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| 165 | code += "var _context = {};\n";
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| 166 | } else {
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| 167 | code += "var _context;\n";
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| 168 | }
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| 169 | code += "var _x = this._x;\n";
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| 170 | if (this.options.interceptors.length > 0) {
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| 171 | code += "var _taps = this.taps;\n";
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| 172 | code += "var _interceptors = this.interceptors;\n";
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| 173 | }
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| 174 | return code;
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| 175 | }
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| 176 |
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| 177 | needContext() {
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| 178 | for (const tap of this.options.taps) if (tap.context) return true;
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| 179 | return false;
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| 180 | }
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| 181 |
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| 182 | callTap(tapIndex, { onError, onResult, onDone, rethrowIfPossible }) {
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| 183 | let code = "";
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| 184 | let hasTapCached = false;
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| 185 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 186 | const interceptor = this.options.interceptors[i];
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| 187 | if (interceptor.tap) {
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| 188 | if (!hasTapCached) {
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| 189 | code += `var _tap${tapIndex} = ${this.getTap(tapIndex)};\n`;
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| 190 | hasTapCached = true;
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| 191 | }
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| 192 | code += `${this.getInterceptor(i)}.tap(${
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| 193 | interceptor.context ? "_context, " : ""
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| 194 | }_tap${tapIndex});\n`;
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| 195 | }
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| 196 | }
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| 197 | code += `var _fn${tapIndex} = ${this.getTapFn(tapIndex)};\n`;
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| 198 | const tap = this.options.taps[tapIndex];
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| 199 | switch (tap.type) {
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| 200 | case "sync":
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| 201 | if (!rethrowIfPossible) {
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| 202 | code += `var _hasError${tapIndex} = false;\n`;
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| 203 | code += "try {\n";
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| 204 | }
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| 205 | if (onResult) {
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| 206 | code += `var _result${tapIndex} = _fn${tapIndex}(${this.args({
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| 207 | before: tap.context ? "_context" : undefined
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| 208 | })});\n`;
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| 209 | } else {
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| 210 | code += `_fn${tapIndex}(${this.args({
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| 211 | before: tap.context ? "_context" : undefined
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| 212 | })});\n`;
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| 213 | }
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| 214 | if (!rethrowIfPossible) {
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| 215 | code += "} catch(_err) {\n";
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| 216 | code += `_hasError${tapIndex} = true;\n`;
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| 217 | code += onError("_err");
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| 218 | code += "}\n";
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| 219 | code += `if(!_hasError${tapIndex}) {\n`;
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| 220 | }
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| 221 | if (onResult) {
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| 222 | code += onResult(`_result${tapIndex}`);
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| 223 | }
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| 224 | if (onDone) {
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| 225 | code += onDone();
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| 226 | }
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| 227 | if (!rethrowIfPossible) {
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| 228 | code += "}\n";
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| 229 | }
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| 230 | break;
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| 231 | case "async":
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| 232 | let cbCode = "";
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| 233 | if (onResult)
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| 234 | cbCode += `(function(_err${tapIndex}, _result${tapIndex}) {\n`;
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| 235 | else cbCode += `(function(_err${tapIndex}) {\n`;
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| 236 | cbCode += `if(_err${tapIndex}) {\n`;
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| 237 | cbCode += onError(`_err${tapIndex}`);
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| 238 | cbCode += "} else {\n";
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| 239 | if (onResult) {
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| 240 | cbCode += onResult(`_result${tapIndex}`);
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| 241 | }
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| 242 | if (onDone) {
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| 243 | cbCode += onDone();
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| 244 | }
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| 245 | cbCode += "}\n";
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| 246 | cbCode += "})";
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| 247 | code += `_fn${tapIndex}(${this.args({
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| 248 | before: tap.context ? "_context" : undefined,
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| 249 | after: cbCode
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| 250 | })});\n`;
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| 251 | break;
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| 252 | case "promise":
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| 253 | code += `var _hasResult${tapIndex} = false;\n`;
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| 254 | code += `var _promise${tapIndex} = _fn${tapIndex}(${this.args({
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| 255 | before: tap.context ? "_context" : undefined
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| 256 | })});\n`;
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| 257 | code += `if (!_promise${tapIndex} || !_promise${tapIndex}.then)\n`;
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| 258 | code += ` throw new Error('Tap function (tapPromise) did not return promise (returned ' + _promise${tapIndex} + ')');\n`;
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| 259 | code += `_promise${tapIndex}.then((function(_result${tapIndex}) {\n`;
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| 260 | code += `_hasResult${tapIndex} = true;\n`;
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| 261 | if (onResult) {
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| 262 | code += onResult(`_result${tapIndex}`);
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| 263 | }
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| 264 | if (onDone) {
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| 265 | code += onDone();
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| 266 | }
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| 267 | code += `}), function(_err${tapIndex}) {\n`;
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| 268 | code += `if(_hasResult${tapIndex}) throw _err${tapIndex};\n`;
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| 269 | code += onError(`_err${tapIndex}`);
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| 270 | code += "});\n";
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| 271 | break;
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| 272 | }
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| 273 | return code;
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| 274 | }
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| 275 |
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| 276 | callTapsSeries({
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| 277 | onError,
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| 278 | onResult,
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| 279 | resultReturns,
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| 280 | onDone,
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| 281 | doneReturns,
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| 282 | rethrowIfPossible
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| 283 | }) {
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| 284 | if (this.options.taps.length === 0) return onDone();
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| 285 | const firstAsync = this.options.taps.findIndex(t => t.type !== "sync");
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| 286 | const somethingReturns = resultReturns || doneReturns;
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| 287 | let code = "";
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| 288 | let current = onDone;
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| 289 | let unrollCounter = 0;
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| 290 | for (let j = this.options.taps.length - 1; j >= 0; j--) {
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| 291 | const i = j;
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| 292 | const unroll =
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| 293 | current !== onDone &&
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| 294 | (this.options.taps[i].type !== "sync" || unrollCounter++ > 20);
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| 295 | if (unroll) {
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| 296 | unrollCounter = 0;
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| 297 | code += `function _next${i}() {\n`;
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| 298 | code += current();
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| 299 | code += `}\n`;
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| 300 | current = () => `${somethingReturns ? "return " : ""}_next${i}();\n`;
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| 301 | }
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| 302 | const done = current;
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| 303 | const doneBreak = skipDone => {
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| 304 | if (skipDone) return "";
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| 305 | return onDone();
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| 306 | };
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| 307 | const content = this.callTap(i, {
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| 308 | onError: error => onError(i, error, done, doneBreak),
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| 309 | onResult:
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| 310 | onResult &&
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| 311 | (result => {
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| 312 | return onResult(i, result, done, doneBreak);
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| 313 | }),
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| 314 | onDone: !onResult && done,
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| 315 | rethrowIfPossible:
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| 316 | rethrowIfPossible && (firstAsync < 0 || i < firstAsync)
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| 317 | });
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| 318 | current = () => content;
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| 319 | }
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| 320 | code += current();
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| 321 | return code;
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| 322 | }
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| 323 |
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| 324 | callTapsLooping({ onError, onDone, rethrowIfPossible }) {
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| 325 | if (this.options.taps.length === 0) return onDone();
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| 326 | const syncOnly = this.options.taps.every(t => t.type === "sync");
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| 327 | let code = "";
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| 328 | if (!syncOnly) {
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| 329 | code += "var _looper = (function() {\n";
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| 330 | code += "var _loopAsync = false;\n";
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| 331 | }
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| 332 | code += "var _loop;\n";
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| 333 | code += "do {\n";
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| 334 | code += "_loop = false;\n";
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| 335 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 336 | const interceptor = this.options.interceptors[i];
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| 337 | if (interceptor.loop) {
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| 338 | code += `${this.getInterceptor(i)}.loop(${this.args({
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| 339 | before: interceptor.context ? "_context" : undefined
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| 340 | })});\n`;
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| 341 | }
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| 342 | }
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| 343 | code += this.callTapsSeries({
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| 344 | onError,
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| 345 | onResult: (i, result, next, doneBreak) => {
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| 346 | let code = "";
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| 347 | code += `if(${result} !== undefined) {\n`;
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| 348 | code += "_loop = true;\n";
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| 349 | if (!syncOnly) code += "if(_loopAsync) _looper();\n";
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| 350 | code += doneBreak(true);
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| 351 | code += `} else {\n`;
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| 352 | code += next();
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| 353 | code += `}\n`;
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| 354 | return code;
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| 355 | },
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| 356 | onDone:
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| 357 | onDone &&
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| 358 | (() => {
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| 359 | let code = "";
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| 360 | code += "if(!_loop) {\n";
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| 361 | code += onDone();
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| 362 | code += "}\n";
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| 363 | return code;
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| 364 | }),
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| 365 | rethrowIfPossible: rethrowIfPossible && syncOnly
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| 366 | });
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| 367 | code += "} while(_loop);\n";
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| 368 | if (!syncOnly) {
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| 369 | code += "_loopAsync = true;\n";
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| 370 | code += "});\n";
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| 371 | code += "_looper();\n";
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| 372 | }
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| 373 | return code;
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| 374 | }
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| 375 |
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| 376 | callTapsParallel({
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| 377 | onError,
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| 378 | onResult,
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| 379 | onDone,
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| 380 | rethrowIfPossible,
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| 381 | onTap = (i, run) => run()
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| 382 | }) {
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| 383 | if (this.options.taps.length <= 1) {
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| 384 | return this.callTapsSeries({
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| 385 | onError,
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| 386 | onResult,
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| 387 | onDone,
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| 388 | rethrowIfPossible
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| 389 | });
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| 390 | }
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| 391 | let code = "";
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| 392 | code += "do {\n";
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| 393 | code += `var _counter = ${this.options.taps.length};\n`;
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| 394 | if (onDone) {
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| 395 | code += "var _done = (function() {\n";
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| 396 | code += onDone();
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| 397 | code += "});\n";
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| 398 | }
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| 399 | for (let i = 0; i < this.options.taps.length; i++) {
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| 400 | const done = () => {
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| 401 | if (onDone) return "if(--_counter === 0) _done();\n";
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| 402 | else return "--_counter;";
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| 403 | };
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| 404 | const doneBreak = skipDone => {
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| 405 | if (skipDone || !onDone) return "_counter = 0;\n";
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| 406 | else return "_counter = 0;\n_done();\n";
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| 407 | };
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| 408 | code += "if(_counter <= 0) break;\n";
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| 409 | code += onTap(
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| 410 | i,
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| 411 | () =>
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| 412 | this.callTap(i, {
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| 413 | onError: error => {
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| 414 | let code = "";
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| 415 | code += "if(_counter > 0) {\n";
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| 416 | code += onError(i, error, done, doneBreak);
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| 417 | code += "}\n";
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| 418 | return code;
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| 419 | },
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| 420 | onResult:
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| 421 | onResult &&
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| 422 | (result => {
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| 423 | let code = "";
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| 424 | code += "if(_counter > 0) {\n";
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| 425 | code += onResult(i, result, done, doneBreak);
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| 426 | code += "}\n";
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| 427 | return code;
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| 428 | }),
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| 429 | onDone:
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| 430 | !onResult &&
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| 431 | (() => {
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| 432 | return done();
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| 433 | }),
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| 434 | rethrowIfPossible
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| 435 | }),
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| 436 | done,
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| 437 | doneBreak
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| 438 | );
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| 439 | }
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| 440 | code += "} while(false);\n";
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| 441 | return code;
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| 442 | }
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| 443 |
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| 444 | args({ before, after } = {}) {
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| 445 | let allArgs = this._args;
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| 446 | if (before) allArgs = [before].concat(allArgs);
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| 447 | if (after) allArgs = allArgs.concat(after);
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| 448 | if (allArgs.length === 0) {
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| 449 | return "";
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| 450 | } else {
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| 451 | return allArgs.join(", ");
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| 452 | }
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| 453 | }
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| 454 |
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| 455 | getTapFn(idx) {
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| 456 | return `_x[${idx}]`;
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| 457 | }
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| 458 |
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| 459 | getTap(idx) {
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| 460 | return `_taps[${idx}]`;
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| 461 | }
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| 462 |
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| 463 | getInterceptor(idx) {
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| 464 | return `_interceptors[${idx}]`;
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| 465 | }
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| 466 | }
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| 467 |
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| 468 | module.exports = HookCodeFactory;
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