| [9af201e] | 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 (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${this.header()}${this.contentWithInterceptors({
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| 22 | onError: (err) => `throw ${err};\n`,
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| 23 | onResult: (result) => `return ${result};\n`,
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| 24 | resultReturns: true,
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| 25 | onDone: () => "",
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| 26 | rethrowIfPossible: true
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| 27 | })}`
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| 28 | );
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| 29 | break;
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| 30 | case "async":
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| 31 | fn = new Function(
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| 32 | this.args({
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| 33 | after: "_callback"
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| 34 | }),
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| 35 | `"use strict";\n${this.header()}${this.contentWithInterceptors({
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| 36 | onError: (err) => `_callback(${err});\n`,
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| 37 | onResult: (result) => `_callback(null, ${result});\n`,
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| 38 | onDone: () => "_callback();\n"
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| 39 | })}`
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| 40 | );
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| 41 | break;
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| 42 | case "promise": {
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| 43 | let errorHelperUsed = false;
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| 44 | const content = this.contentWithInterceptors({
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| 45 | onError: (err) => {
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| 46 | errorHelperUsed = true;
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| 47 | return `_error(${err});\n`;
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| 48 | },
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| 49 | onResult: (result) => `_resolve(${result});\n`,
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| 50 | onDone: () => "_resolve();\n"
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| 51 | });
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| 52 | let code = "";
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| 53 | code += '"use strict";\n';
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| 54 | code += this.header();
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| 55 | code += "return new Promise((function(_resolve, _reject) {\n";
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| 56 | if (errorHelperUsed) {
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| 57 | code += "var _sync = true;\n";
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| 58 | code += "function _error(_err) {\n";
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| 59 | code += "if(_sync)\n";
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| 60 | code +=
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| 61 | "_resolve(Promise.resolve().then((function() { throw _err; })));\n";
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| 62 | code += "else\n";
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| 63 | code += "_reject(_err);\n";
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| 64 | code += "};\n";
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| 65 | }
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| 66 | code += content;
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| 67 | if (errorHelperUsed) {
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| 68 | code += "_sync = false;\n";
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| 69 | }
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| 70 | code += "}));\n";
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| 71 | fn = new Function(this.args(), code);
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| 72 | break;
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| 73 | }
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| 74 | }
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| 75 | this.deinit();
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| 76 | return fn;
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| 77 | }
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| 78 |
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| 79 | setup(instance, options) {
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| 80 | const { taps } = options;
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| 81 | const { length } = taps;
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| 82 | const fns = Array.from({ length });
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| 83 | for (let i = 0; i < length; i++) {
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| 84 | fns[i] = taps[i].fn;
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| 85 | }
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| 86 | instance._x = fns;
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| 87 | }
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| 88 |
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| 89 | /**
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| 90 | * @param {{ type: "sync" | "promise" | "async", taps: Array<Tap>, interceptors: Array<Interceptor> }} options
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| 91 | */
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| 92 | init(options) {
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| 93 | this.options = options;
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| 94 | // `_args` is only read (length / join / [0]) - never mutated - so we
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| 95 | // can share the caller's array directly instead of paying for a copy
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| 96 | // on every compile.
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| 97 | this._args = options.args;
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| 98 | this._joinedArgs = undefined;
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| 99 | }
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| 100 |
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| 101 | deinit() {
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| 102 | this.options = undefined;
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| 103 | this._args = undefined;
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| 104 | this._joinedArgs = undefined;
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| 105 | }
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| 106 |
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| 107 | contentWithInterceptors(options) {
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| 108 | if (this.options.interceptors.length > 0) {
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| 109 | const { onError, onResult, onDone } = options;
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| 110 | let code = "";
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| 111 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 112 | const interceptor = this.options.interceptors[i];
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| 113 | if (interceptor.call) {
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| 114 | code += `${this.getInterceptor(i)}.call(${this.args({
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| 115 | before: interceptor.context ? "_context" : undefined
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| 116 | })});\n`;
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| 117 | }
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| 118 | }
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| 119 | code += this.content(
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| 120 | Object.assign(options, {
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| 121 | onError:
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| 122 | onError &&
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| 123 | ((err) => {
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| 124 | let code = "";
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| 125 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 126 | const interceptor = this.options.interceptors[i];
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| 127 | if (interceptor.error) {
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| 128 | code += `${this.getInterceptor(i)}.error(${err});\n`;
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| 129 | }
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| 130 | }
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| 131 | code += onError(err);
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| 132 | return code;
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| 133 | }),
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| 134 | onResult:
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| 135 | onResult &&
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| 136 | ((result) => {
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| 137 | let code = "";
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| 138 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 139 | const interceptor = this.options.interceptors[i];
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| 140 | if (interceptor.result) {
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| 141 | code += `${this.getInterceptor(i)}.result(${result});\n`;
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| 142 | }
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| 143 | }
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| 144 | code += onResult(result);
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| 145 | return code;
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| 146 | }),
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| 147 | onDone:
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| 148 | onDone &&
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| 149 | (() => {
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| 150 | let code = "";
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| 151 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 152 | const interceptor = this.options.interceptors[i];
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| 153 | if (interceptor.done) {
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| 154 | code += `${this.getInterceptor(i)}.done();\n`;
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| 155 | }
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| 156 | }
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| 157 | code += onDone();
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| 158 | return code;
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| 159 | })
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| 160 | })
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| 161 | );
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| 162 | return code;
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| 163 | }
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| 164 | return this.content(options);
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| 165 | }
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| 166 |
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| 167 | header() {
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| 168 | let code = "";
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| 169 | code += this.needContext() ? "var _context = {};\n" : "var _context;\n";
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| 170 | code += "var _x = this._x;\n";
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| 171 | if (this.options.interceptors.length > 0) {
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| 172 | code += "var _taps = this.taps;\n";
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| 173 | code += "var _interceptors = this.interceptors;\n";
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| 174 | }
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| 175 | return code;
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| 176 | }
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| 177 |
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| 178 | needContext() {
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| 179 | const { taps } = this.options;
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| 180 | for (let i = 0; i < taps.length; i++) {
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| 181 | if (taps[i].context) return true;
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| 182 | }
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| 183 | return false;
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| 184 | }
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| 185 |
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| 186 | callTap(tapIndex, { onError, onResult, onDone, rethrowIfPossible }) {
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| 187 | let code = "";
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| 188 | let hasTapCached = false;
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| 189 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 190 | const interceptor = this.options.interceptors[i];
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| 191 | if (interceptor.tap) {
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| 192 | if (!hasTapCached) {
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| 193 | code += `var _tap${tapIndex} = ${this.getTap(tapIndex)};\n`;
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| 194 | hasTapCached = true;
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| 195 | }
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| 196 | code += `${this.getInterceptor(i)}.tap(${
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| 197 | interceptor.context ? "_context, " : ""
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| 198 | }_tap${tapIndex});\n`;
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| 199 | }
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| 200 | }
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| 201 | code += `var _fn${tapIndex} = ${this.getTapFn(tapIndex)};\n`;
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| 202 | const tap = this.options.taps[tapIndex];
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| 203 | switch (tap.type) {
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| 204 | case "sync":
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| 205 | if (!rethrowIfPossible) {
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| 206 | code += `var _hasError${tapIndex} = false;\n`;
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| 207 | code += "try {\n";
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| 208 | }
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| 209 | if (onResult) {
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| 210 | code += `var _result${tapIndex} = _fn${tapIndex}(${this.args({
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| 211 | before: tap.context ? "_context" : undefined
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| 212 | })});\n`;
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| 213 | } else {
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| 214 | code += `_fn${tapIndex}(${this.args({
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| 215 | before: tap.context ? "_context" : undefined
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| 216 | })});\n`;
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| 217 | }
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| 218 | if (!rethrowIfPossible) {
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| 219 | code += "} catch(_err) {\n";
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| 220 | code += `_hasError${tapIndex} = true;\n`;
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| 221 | code += onError("_err");
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| 222 | code += "}\n";
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| 223 | code += `if(!_hasError${tapIndex}) {\n`;
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| 224 | }
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| 225 | if (onResult) {
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| 226 | code += onResult(`_result${tapIndex}`);
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| 227 | }
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| 228 | if (onDone) {
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| 229 | code += onDone();
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| 230 | }
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| 231 | if (!rethrowIfPossible) {
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| 232 | code += "}\n";
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| 233 | }
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| 234 | break;
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| 235 | case "async": {
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| 236 | let cbCode = "";
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| 237 | cbCode += onResult
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| 238 | ? `(function(_err${tapIndex}, _result${tapIndex}) {\n`
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| 239 | : `(function(_err${tapIndex}) {\n`;
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| 240 | cbCode += `if(_err${tapIndex}) {\n`;
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| 241 | cbCode += onError(`_err${tapIndex}`);
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| 242 | cbCode += "} else {\n";
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| 243 | if (onResult) {
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| 244 | cbCode += onResult(`_result${tapIndex}`);
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| 245 | }
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| 246 | if (onDone) {
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| 247 | cbCode += onDone();
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| 248 | }
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| 249 | cbCode += "}\n";
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| 250 | cbCode += "})";
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| 251 | code += `_fn${tapIndex}(${this.args({
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| 252 | before: tap.context ? "_context" : undefined,
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| 253 | after: cbCode
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| 254 | })});\n`;
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| 255 | break;
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| 256 | }
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| 257 | case "promise":
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| 258 | code += `var _hasResult${tapIndex} = false;\n`;
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| 259 | code += `var _promise${tapIndex} = _fn${tapIndex}(${this.args({
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| 260 | before: tap.context ? "_context" : undefined
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| 261 | })});\n`;
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| 262 | code += `if (!_promise${tapIndex} || !_promise${tapIndex}.then)\n`;
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| 263 | code += ` throw new Error('Tap function (tapPromise) did not return promise (returned ' + _promise${tapIndex} + ')');\n`;
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| 264 | code += `_promise${tapIndex}.then((function(_result${tapIndex}) {\n`;
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| 265 | code += `_hasResult${tapIndex} = true;\n`;
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| 266 | if (onResult) {
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| 267 | code += onResult(`_result${tapIndex}`);
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| 268 | }
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| 269 | if (onDone) {
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| 270 | code += onDone();
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| 271 | }
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| 272 | code += `}), function(_err${tapIndex}) {\n`;
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| 273 | code += `if(_hasResult${tapIndex}) throw _err${tapIndex};\n`;
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| 274 | code += onError(
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| 275 | `!_err${tapIndex} ? new Error('Tap function (tapPromise) rejects "' + _err${tapIndex} + '" value') : _err${tapIndex}`
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| 276 | );
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| 277 | code += "});\n";
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| 278 | break;
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| 279 | }
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| 280 | return code;
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| 281 | }
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| 282 |
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| 283 | callTapsSeries({
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| 284 | onError,
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| 285 | onResult,
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| 286 | resultReturns,
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| 287 | onDone,
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| 288 | doneReturns,
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| 289 | rethrowIfPossible
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| 290 | }) {
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| 291 | const { taps } = this.options;
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| 292 | const tapsLength = taps.length;
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| 293 | if (tapsLength === 0) return onDone();
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| 294 | // Inlined findIndex to avoid the callback allocation.
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| 295 | let firstAsync = -1;
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| 296 | for (let i = 0; i < tapsLength; i++) {
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| 297 | if (taps[i].type !== "sync") {
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| 298 | firstAsync = i;
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| 299 | break;
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| 300 | }
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| 301 | }
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| 302 | const somethingReturns = resultReturns || doneReturns;
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| 303 | // doneBreak doesn't depend on the loop variable - hoist to allocate once.
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| 304 | const doneBreak = (skipDone) => {
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| 305 | if (skipDone) return "";
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| 306 | return onDone();
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| 307 | };
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| 308 | let code = "";
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| 309 | let current = onDone;
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| 310 | let unrollCounter = 0;
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| 311 | for (let j = tapsLength - 1; j >= 0; j--) {
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| 312 | const i = j;
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| 313 | const unroll =
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| 314 | current !== onDone && (taps[i].type !== "sync" || unrollCounter++ > 20);
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| 315 | if (unroll) {
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| 316 | unrollCounter = 0;
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| 317 | code += `function _next${i}() {\n`;
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| 318 | code += current();
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| 319 | code += "}\n";
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| 320 | current = () => `${somethingReturns ? "return " : ""}_next${i}();\n`;
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| 321 | }
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| 322 | const done = current;
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| 323 | const content = this.callTap(i, {
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| 324 | onError: (error) => onError(i, error, done, doneBreak),
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| 325 | onResult:
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| 326 | onResult && ((result) => onResult(i, result, done, doneBreak)),
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| 327 | onDone: !onResult && done,
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| 328 | rethrowIfPossible:
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| 329 | rethrowIfPossible && (firstAsync < 0 || i < firstAsync)
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| 330 | });
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| 331 | current = () => content;
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| 332 | }
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| 333 | code += current();
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| 334 | return code;
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| 335 | }
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| 336 |
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| 337 | callTapsLooping({ onError, onDone, rethrowIfPossible }) {
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| 338 | if (this.options.taps.length === 0) return onDone();
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| 339 | const syncOnly = this.options.taps.every((t) => t.type === "sync");
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| 340 | let code = "";
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| 341 | if (!syncOnly) {
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| 342 | code += "var _looper = (function() {\n";
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| 343 | code += "var _loopAsync = false;\n";
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| 344 | }
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| 345 | code += "var _loop;\n";
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| 346 | code += "do {\n";
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| 347 | code += "_loop = false;\n";
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| 348 | for (let i = 0; i < this.options.interceptors.length; i++) {
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| 349 | const interceptor = this.options.interceptors[i];
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| 350 | if (interceptor.loop) {
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| 351 | code += `${this.getInterceptor(i)}.loop(${this.args({
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| 352 | before: interceptor.context ? "_context" : undefined
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| 353 | })});\n`;
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| 354 | }
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| 355 | }
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| 356 | code += this.callTapsSeries({
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| 357 | onError,
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| 358 | onResult: (i, result, next, doneBreak) => {
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| 359 | let code = "";
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| 360 | code += `if(${result} !== undefined) {\n`;
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| 361 | code += "_loop = true;\n";
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| 362 | if (!syncOnly) code += "if(_loopAsync) _looper();\n";
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| 363 | code += doneBreak(true);
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| 364 | code += "} else {\n";
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| 365 | code += next();
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| 366 | code += "}\n";
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| 367 | return code;
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| 368 | },
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| 369 | onDone:
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| 370 | onDone &&
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| 371 | (() => {
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| 372 | let code = "";
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| 373 | code += "if(!_loop) {\n";
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| 374 | code += onDone();
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| 375 | code += "}\n";
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| 376 | return code;
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| 377 | }),
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| 378 | rethrowIfPossible: rethrowIfPossible && syncOnly
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| 379 | });
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| 380 | code += "} while(_loop);\n";
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| 381 | if (!syncOnly) {
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| 382 | code += "_loopAsync = true;\n";
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| 383 | code += "});\n";
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| 384 | code += "_looper();\n";
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| 385 | }
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| 386 | return code;
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| 387 | }
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| 388 |
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| 389 | callTapsParallel({
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| 390 | onError,
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| 391 | onResult,
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| 392 | onDone,
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| 393 | rethrowIfPossible,
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| 394 | onTap = (i, run) => run()
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| 395 | }) {
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| 396 | const { taps } = this.options;
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| 397 | const tapsLength = taps.length;
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| 398 | if (tapsLength <= 1) {
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| 399 | return this.callTapsSeries({
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| 400 | onError,
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| 401 | onResult,
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| 402 | onDone,
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| 403 | rethrowIfPossible
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| 404 | });
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| 405 | }
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| 406 | // done and doneBreak don't depend on the loop variable - hoist them
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| 407 | // so they're allocated once per compile instead of once per tap.
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| 408 | const done = () => {
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| 409 | if (onDone) return "if(--_counter === 0) _done();\n";
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| 410 | return "--_counter;";
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| 411 | };
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| 412 | const doneBreak = (skipDone) => {
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| 413 | if (skipDone || !onDone) return "_counter = 0;\n";
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| 414 | return "_counter = 0;\n_done();\n";
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| 415 | };
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| 416 | let code = "";
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| 417 | code += "do {\n";
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| 418 | code += `var _counter = ${tapsLength};\n`;
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| 419 | if (onDone) {
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| 420 | code += "var _done = (function() {\n";
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| 421 | code += onDone();
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| 422 | code += "});\n";
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| 423 | }
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| 424 | for (let i = 0; i < tapsLength; i++) {
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| 425 | code += "if(_counter <= 0) break;\n";
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| 426 | code += onTap(
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| 427 | i,
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| 428 | () =>
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| 429 | this.callTap(i, {
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| 430 | onError: (error) => {
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| 431 | let code = "";
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| 432 | code += "if(_counter > 0) {\n";
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| 433 | code += onError(i, error, done, doneBreak);
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| 434 | code += "}\n";
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| 435 | return code;
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| 436 | },
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| 437 | onResult:
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| 438 | onResult &&
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| 439 | ((result) => {
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| 440 | let code = "";
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| 441 | code += "if(_counter > 0) {\n";
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| 442 | code += onResult(i, result, done, doneBreak);
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| 443 | code += "}\n";
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| 444 | return code;
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| 445 | }),
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| 446 | onDone: !onResult && (() => done()),
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| 447 | rethrowIfPossible
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| 448 | }),
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| 449 | done,
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| 450 | doneBreak
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| 451 | );
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| 452 | }
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| 453 | code += "} while(false);\n";
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| 454 | return code;
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| 455 | }
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| 456 |
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| 457 | args({ before, after } = {}) {
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| 458 | // Hot during code generation. Join `_args` once and cache the result,
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| 459 | // then build the customized variants via string concat instead of
|
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| 460 | // allocating temporary `[before, ...allArgs]` / `[...allArgs, after]`
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| 461 | // arrays and re-joining.
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| 462 | let joined = this._joinedArgs;
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|---|
| 463 | if (joined === undefined) {
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| 464 | joined = this._args.length === 0 ? "" : this._args.join(", ");
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| 465 | this._joinedArgs = joined;
|
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| 466 | }
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|---|
| 467 | if (!before && !after) return joined;
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|---|
| 468 | if (joined.length === 0) {
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|---|
| 469 | if (before && after) return `${before}, ${after}`;
|
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| 470 | return before || after;
|
|---|
| 471 | }
|
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| 472 | if (before && after) return `${before}, ${joined}, ${after}`;
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| 473 | if (before) return `${before}, ${joined}`;
|
|---|
| 474 | return `${joined}, ${after}`;
|
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| 475 | }
|
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| 476 |
|
|---|
| 477 | getTapFn(idx) {
|
|---|
| 478 | return `_x[${idx}]`;
|
|---|
| 479 | }
|
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| 480 |
|
|---|
| 481 | getTap(idx) {
|
|---|
| 482 | return `_taps[${idx}]`;
|
|---|
| 483 | }
|
|---|
| 484 |
|
|---|
| 485 | getInterceptor(idx) {
|
|---|
| 486 | return `_interceptors[${idx}]`;
|
|---|
| 487 | }
|
|---|
| 488 | }
|
|---|
| 489 |
|
|---|
| 490 | module.exports = HookCodeFactory;
|
|---|
