| 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 |
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| 6 | "use strict";
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| 7 |
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| 8 | const RawSource = require("./RawSource");
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| 9 | const Source = require("./Source");
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| 10 | const { getMap, getSourceAndMap } = require("./helpers/getFromStreamChunks");
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| 11 | const streamChunks = require("./helpers/streamChunks");
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| 12 |
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| 13 | /** @typedef {import("./CompatSource").SourceLike} SourceLike */
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| 14 | /** @typedef {import("./Source").HashLike} HashLike */
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| 15 | /** @typedef {import("./Source").MapOptions} MapOptions */
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| 16 | /** @typedef {import("./Source").RawSourceMap} RawSourceMap */
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| 17 | /** @typedef {import("./Source").SourceAndMap} SourceAndMap */
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| 18 | /** @typedef {import("./Source").SourceValue} SourceValue */
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| 19 | /** @typedef {import("./helpers/getGeneratedSourceInfo").GeneratedSourceInfo} GeneratedSourceInfo */
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| 20 | /** @typedef {import("./helpers/streamChunks").OnChunk} OnChunk */
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| 21 | /** @typedef {import("./helpers/streamChunks").OnName} OnName */
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| 22 | /** @typedef {import("./helpers/streamChunks").OnSource} OnSource */
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| 23 | /** @typedef {import("./helpers/streamChunks").Options} Options */
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| 24 |
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| 25 | /** @typedef {string | Source | SourceLike} Child */
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| 26 |
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| 27 | const stringsAsRawSources = new WeakSet();
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| 28 |
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| 29 | class ConcatSource extends Source {
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| 30 | /**
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| 31 | * @param {Child[]} args children
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| 32 | */
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| 33 | constructor(...args) {
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| 34 | super();
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| 35 | /**
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| 36 | * @private
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| 37 | * @type {Child[]}
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| 38 | */
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| 39 | this._children = [];
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| 40 |
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| 41 | // Indexed loops avoid the iterator-protocol overhead `for...of`
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| 42 | // pays per element. Hot during webpack's emit when many
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| 43 | // ConcatSources are constructed/flattened.
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| 44 | for (let i = 0, l = args.length; i < l; i++) {
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| 45 | const item = args[i];
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| 46 | if (item instanceof ConcatSource) {
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| 47 | const children = item._children;
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| 48 | for (let j = 0, jl = children.length; j < jl; j++) {
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| 49 | this._children.push(children[j]);
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| 50 | }
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| 51 | } else {
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| 52 | this._children.push(item);
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| 53 | }
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| 54 | }
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| 55 |
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| 56 | /**
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| 57 | * @private
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| 58 | * @type {boolean}
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| 59 | */
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| 60 | this._isOptimized = args.length === 0;
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| 61 | }
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| 62 |
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| 63 | /**
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| 64 | * @returns {Source[]} children
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| 65 | */
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| 66 | getChildren() {
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| 67 | if (!this._isOptimized) this._optimize();
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| 68 | return /** @type {Source[]} */ (this._children);
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| 69 | }
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| 70 |
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| 71 | /**
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| 72 | * @param {Child} item item
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| 73 | * @returns {void}
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| 74 | */
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| 75 | add(item) {
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| 76 | if (item instanceof ConcatSource) {
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| 77 | const children = item._children;
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| 78 | for (let i = 0, l = children.length; i < l; i++) {
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| 79 | this._children.push(children[i]);
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| 80 | }
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| 81 | } else {
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| 82 | this._children.push(item);
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| 83 | }
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| 84 | this._isOptimized = false;
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| 85 | }
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| 86 |
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| 87 | /**
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| 88 | * @param {Child[]} items items
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| 89 | * @returns {void}
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| 90 | */
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| 91 | addAllSkipOptimizing(items) {
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| 92 | for (let i = 0, l = items.length; i < l; i++) {
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| 93 | this._children.push(items[i]);
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| 94 | }
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| 95 | }
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| 96 |
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| 97 | /**
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| 98 | * @returns {Buffer} buffer
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| 99 | */
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| 100 | buffer() {
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| 101 | return Buffer.concat(this.buffers());
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| 102 | }
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| 103 |
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| 104 | /**
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| 105 | * @returns {Buffer[]} buffers
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| 106 | */
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| 107 | buffers() {
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| 108 | if (!this._isOptimized) this._optimize();
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| 109 | const children = /** @type {SourceLike[]} */ (this._children);
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| 110 | const childCount = children.length;
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| 111 | /** @type {Buffer[]} */
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| 112 | const buffers = [];
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| 113 | // Indexed loop + manual splat avoids the iterator allocation per
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| 114 | // child and the inner for-of allocation per child.buffers() call.
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| 115 | // Hot path during webpack's emit on deeply-nested ConcatSources.
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| 116 | for (let ci = 0; ci < childCount; ci++) {
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| 117 | const child = children[ci];
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| 118 | if (typeof child.buffers === "function") {
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| 119 | const childBuffers = child.buffers();
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| 120 | for (let bi = 0, blen = childBuffers.length; bi < blen; bi++) {
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| 121 | buffers.push(childBuffers[bi]);
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| 122 | }
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| 123 | } else if (typeof child.buffer === "function") {
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| 124 | buffers.push(child.buffer());
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| 125 | } else {
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| 126 | const bufferOrString = child.source();
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| 127 | if (Buffer.isBuffer(bufferOrString)) {
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| 128 | buffers.push(bufferOrString);
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| 129 | } else {
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| 130 | // This will not happen
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| 131 | buffers.push(Buffer.from(bufferOrString, "utf8"));
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| 132 | }
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| 133 | }
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| 134 | }
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| 135 | return buffers;
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| 136 | }
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| 137 |
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| 138 | /**
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| 139 | * @returns {SourceValue} source
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| 140 | */
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| 141 | source() {
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| 142 | if (!this._isOptimized) this._optimize();
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| 143 | const children = /** @type {Source[]} */ (this._children);
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| 144 | const childCount = children.length;
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| 145 | let source = "";
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| 146 | for (let ci = 0; ci < childCount; ci++) {
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| 147 | source += children[ci].source();
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| 148 | }
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| 149 | return source;
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| 150 | }
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| 151 |
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| 152 | /**
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| 153 | * @returns {number} size
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| 154 | */
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| 155 | size() {
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| 156 | if (!this._isOptimized) this._optimize();
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| 157 | const children = /** @type {Source[]} */ (this._children);
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| 158 | const childCount = children.length;
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| 159 | let size = 0;
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| 160 | for (let ci = 0; ci < childCount; ci++) {
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| 161 | size += children[ci].size();
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| 162 | }
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| 163 | return size;
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| 164 | }
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| 165 |
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| 166 | /**
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| 167 | * @param {MapOptions=} options map options
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| 168 | * @returns {RawSourceMap | null} map
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| 169 | */
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| 170 | map(options) {
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| 171 | return getMap(this, options);
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| 172 | }
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| 173 |
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| 174 | /**
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| 175 | * @param {MapOptions=} options map options
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| 176 | * @returns {SourceAndMap} source and map
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| 177 | */
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| 178 | sourceAndMap(options) {
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| 179 | return getSourceAndMap(this, options);
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| 180 | }
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| 181 |
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| 182 | /**
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| 183 | * @param {Options} options options
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| 184 | * @param {OnChunk} onChunk called for each chunk of code
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| 185 | * @param {OnSource} onSource called for each source
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| 186 | * @param {OnName} onName called for each name
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| 187 | * @returns {GeneratedSourceInfo} generated source info
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| 188 | */
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| 189 | streamChunks(options, onChunk, onSource, onName) {
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| 190 | if (!this._isOptimized) this._optimize();
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| 191 | if (this._children.length === 1) {
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| 192 | return /** @type {ConcatSource[]} */ (this._children)[0].streamChunks(
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| 193 | options,
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| 194 | onChunk,
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| 195 | onSource,
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| 196 | onName,
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| 197 | );
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| 198 | }
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| 199 | let currentLineOffset = 0;
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| 200 | let currentColumnOffset = 0;
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| 201 | const sourceMapping = new Map();
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| 202 | const nameMapping = new Map();
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| 203 | const finalSource = Boolean(options && options.finalSource);
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| 204 | let code = "";
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| 205 | let needToCloseMapping = false;
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| 206 | const children = /** @type {Source[]} */ (this._children);
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| 207 | const childCount = children.length;
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| 208 | for (let ci = 0; ci < childCount; ci++) {
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| 209 | const item = children[ci];
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| 210 | /** @type {number[]} */
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| 211 | const sourceIndexMapping = [];
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| 212 | /** @type {number[]} */
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| 213 | const nameIndexMapping = [];
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| 214 | let lastMappingLine = 0;
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| 215 | const { generatedLine, generatedColumn, source } = streamChunks(
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| 216 | item,
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| 217 | options,
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| 218 | // eslint-disable-next-line no-loop-func
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| 219 | (
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| 220 | chunk,
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| 221 | generatedLine,
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| 222 | generatedColumn,
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| 223 | sourceIndex,
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| 224 | originalLine,
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| 225 | originalColumn,
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| 226 | nameIndex,
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| 227 | ) => {
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| 228 | const line = generatedLine + currentLineOffset;
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| 229 | const column =
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| 230 | generatedLine === 1
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| 231 | ? generatedColumn + currentColumnOffset
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| 232 | : generatedColumn;
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| 233 | if (needToCloseMapping) {
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| 234 | if (generatedLine !== 1 || generatedColumn !== 0) {
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| 235 | onChunk(
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| 236 | undefined,
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| 237 | currentLineOffset + 1,
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| 238 | currentColumnOffset,
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| 239 | -1,
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| 240 | -1,
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| 241 | -1,
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| 242 | -1,
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| 243 | );
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| 244 | }
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| 245 | needToCloseMapping = false;
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| 246 | }
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| 247 | const resultSourceIndex =
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| 248 | sourceIndex < 0 || sourceIndex >= sourceIndexMapping.length
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| 249 | ? -1
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| 250 | : sourceIndexMapping[sourceIndex];
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| 251 | let _chunk;
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| 252 | // When using finalSource, we process the entire source code at once at the end, rather than chunk by chunk
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| 253 | if (finalSource) {
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| 254 | if (chunk !== undefined) code += chunk;
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| 255 | } else {
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| 256 | _chunk = chunk;
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| 257 | }
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| 258 | if (resultSourceIndex < 0) {
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| 259 | lastMappingLine = 0;
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| 260 | onChunk(_chunk, line, column, -1, -1, -1, -1);
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| 261 | } else {
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| 262 | // Only compute the remapped name index when the chunk
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| 263 | // actually carries a source mapping; otherwise it is
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| 264 | // unused.
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| 265 | const resultNameIndex =
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| 266 | nameIndex < 0 || nameIndex >= nameIndexMapping.length
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| 267 | ? -1
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| 268 | : nameIndexMapping[nameIndex];
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| 269 | lastMappingLine = generatedLine;
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| 270 | onChunk(
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| 271 | _chunk,
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| 272 | line,
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| 273 | column,
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| 274 | resultSourceIndex,
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| 275 | originalLine,
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| 276 | originalColumn,
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| 277 | resultNameIndex,
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| 278 | );
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| 279 | }
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| 280 | },
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| 281 | (i, source, sourceContent) => {
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| 282 | let globalIndex = sourceMapping.get(source);
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| 283 | if (globalIndex === undefined) {
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| 284 | sourceMapping.set(source, (globalIndex = sourceMapping.size));
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| 285 | onSource(globalIndex, source, sourceContent);
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| 286 | }
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| 287 | sourceIndexMapping[i] = globalIndex;
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| 288 | },
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| 289 | (i, name) => {
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| 290 | let globalIndex = nameMapping.get(name);
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| 291 | if (globalIndex === undefined) {
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| 292 | nameMapping.set(name, (globalIndex = nameMapping.size));
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| 293 | onName(globalIndex, name);
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| 294 | }
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| 295 | nameIndexMapping[i] = globalIndex;
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| 296 | },
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| 297 | );
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| 298 | if (source !== undefined) code += source;
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| 299 | if (
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| 300 | needToCloseMapping &&
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| 301 | (generatedLine !== 1 || generatedColumn !== 0)
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| 302 | ) {
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| 303 | onChunk(
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| 304 | undefined,
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| 305 | currentLineOffset + 1,
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| 306 | currentColumnOffset,
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| 307 | -1,
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| 308 | -1,
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| 309 | -1,
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| 310 | -1,
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| 311 | );
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| 312 | needToCloseMapping = false;
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| 313 | }
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| 314 | if (/** @type {number} */ (generatedLine) > 1) {
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| 315 | currentColumnOffset = /** @type {number} */ (generatedColumn);
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| 316 | } else {
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| 317 | currentColumnOffset += /** @type {number} */ (generatedColumn);
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| 318 | }
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| 319 | needToCloseMapping =
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| 320 | needToCloseMapping ||
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| 321 | (finalSource && lastMappingLine === generatedLine);
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| 322 | currentLineOffset += /** @type {number} */ (generatedLine) - 1;
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| 323 | }
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| 324 | return {
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| 325 | generatedLine: currentLineOffset + 1,
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| 326 | generatedColumn: currentColumnOffset,
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| 327 | source: finalSource ? code : undefined,
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| 328 | };
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| 329 | }
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| 330 |
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| 331 | /**
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| 332 | * @param {HashLike} hash hash
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| 333 | * @returns {void}
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| 334 | */
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| 335 | updateHash(hash) {
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| 336 | if (!this._isOptimized) this._optimize();
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| 337 | const children = /** @type {Source[]} */ (this._children);
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| 338 | const childCount = children.length;
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| 339 | hash.update("ConcatSource");
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| 340 | for (let ci = 0; ci < childCount; ci++) {
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| 341 | children[ci].updateHash(hash);
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| 342 | }
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| 343 | }
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| 344 |
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| 345 | _optimize() {
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| 346 | const newChildren = [];
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| 347 | let currentString;
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| 348 | /** @type {undefined | string | [string, string] | SourceLike} */
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| 349 | let currentRawSources;
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| 350 | /**
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| 351 | * @param {string} string string
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| 352 | * @returns {void}
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| 353 | */
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| 354 | const addStringToRawSources = (string) => {
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| 355 | if (currentRawSources === undefined) {
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| 356 | currentRawSources = string;
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| 357 | } else if (Array.isArray(currentRawSources)) {
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| 358 | currentRawSources.push(string);
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| 359 | } else {
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| 360 | currentRawSources = [
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| 361 | typeof currentRawSources === "string"
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| 362 | ? currentRawSources
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| 363 | : /** @type {string} */ (currentRawSources.source()),
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| 364 | string,
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| 365 | ];
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| 366 | }
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| 367 | };
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| 368 | /**
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| 369 | * @param {SourceLike} source source
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| 370 | * @returns {void}
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| 371 | */
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| 372 | const addSourceToRawSources = (source) => {
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| 373 | if (currentRawSources === undefined) {
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| 374 | currentRawSources = source;
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| 375 | } else if (Array.isArray(currentRawSources)) {
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| 376 | currentRawSources.push(
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| 377 | /** @type {string} */
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| 378 | (source.source()),
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| 379 | );
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| 380 | } else {
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| 381 | currentRawSources = [
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| 382 | typeof currentRawSources === "string"
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| 383 | ? currentRawSources
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| 384 | : /** @type {string} */ (currentRawSources.source()),
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| 385 | /** @type {string} */
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| 386 | (source.source()),
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| 387 | ];
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| 388 | }
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| 389 | };
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| 390 | const mergeRawSources = () => {
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| 391 | if (Array.isArray(currentRawSources)) {
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| 392 | const rawSource = new RawSource(currentRawSources.join(""));
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| 393 | stringsAsRawSources.add(rawSource);
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| 394 | newChildren.push(rawSource);
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| 395 | } else if (typeof currentRawSources === "string") {
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| 396 | const rawSource = new RawSource(currentRawSources);
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| 397 | stringsAsRawSources.add(rawSource);
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| 398 | newChildren.push(rawSource);
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| 399 | } else {
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| 400 | newChildren.push(currentRawSources);
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| 401 | }
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| 402 | };
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| 403 | const children = this._children;
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| 404 | for (let ci = 0, cl = children.length; ci < cl; ci++) {
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| 405 | const child = children[ci];
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| 406 | if (typeof child === "string") {
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| 407 | if (currentString === undefined) {
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| 408 | currentString = child;
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| 409 | } else {
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| 410 | currentString += child;
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| 411 | }
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| 412 | } else {
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| 413 | if (currentString !== undefined) {
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| 414 | addStringToRawSources(currentString);
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| 415 | currentString = undefined;
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| 416 | }
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| 417 | if (stringsAsRawSources.has(child)) {
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| 418 | addSourceToRawSources(
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| 419 | /** @type {SourceLike} */
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| 420 | (child),
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| 421 | );
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| 422 | } else {
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| 423 | if (currentRawSources !== undefined) {
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| 424 | mergeRawSources();
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| 425 | currentRawSources = undefined;
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| 426 | }
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| 427 | newChildren.push(child);
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| 428 | }
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| 429 | }
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| 430 | }
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| 431 | if (currentString !== undefined) {
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| 432 | addStringToRawSources(currentString);
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| 433 | }
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| 434 | if (currentRawSources !== undefined) {
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| 435 | mergeRawSources();
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| 436 | }
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| 437 | this._children = newChildren;
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| 438 | this._isOptimized = true;
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| 439 | }
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| 440 | }
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| 441 |
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| 442 | module.exports = ConcatSource;
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