| 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 | const { getMap, getSourceAndMap } = require("./helpers/getFromStreamChunks");
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| 8 | const streamChunks = require("./helpers/streamChunks");
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| 9 | const Source = require("./Source");
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| 10 | const splitIntoLines = require("./helpers/splitIntoLines");
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| 11 |
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| 12 | // since v8 7.0, Array.prototype.sort is stable
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| 13 | const hasStableSort =
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| 14 | typeof process === "object" &&
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| 15 | process.versions &&
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| 16 | typeof process.versions.v8 === "string" &&
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| 17 | !/^[0-6]\./.test(process.versions.v8);
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| 18 |
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| 19 | // This is larger than max string length
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| 20 | const MAX_SOURCE_POSITION = 0x20000000;
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| 21 |
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| 22 | class Replacement {
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| 23 | constructor(start, end, content, name) {
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| 24 | this.start = start;
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| 25 | this.end = end;
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| 26 | this.content = content;
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| 27 | this.name = name;
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| 28 | if (!hasStableSort) {
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| 29 | this.index = -1;
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| 30 | }
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| 31 | }
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| 32 | }
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| 33 |
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| 34 | class ReplaceSource extends Source {
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| 35 | constructor(source, name) {
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| 36 | super();
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| 37 | this._source = source;
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| 38 | this._name = name;
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| 39 | /** @type {Replacement[]} */
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| 40 | this._replacements = [];
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| 41 | this._isSorted = true;
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| 42 | }
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| 43 |
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| 44 | getName() {
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| 45 | return this._name;
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| 46 | }
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| 47 |
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| 48 | getReplacements() {
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| 49 | this._sortReplacements();
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| 50 | return this._replacements;
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| 51 | }
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| 52 |
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| 53 | replace(start, end, newValue, name) {
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| 54 | if (typeof newValue !== "string")
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| 55 | throw new Error(
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| 56 | "insertion must be a string, but is a " + typeof newValue
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| 57 | );
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| 58 | this._replacements.push(new Replacement(start, end, newValue, name));
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| 59 | this._isSorted = false;
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| 60 | }
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| 61 |
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| 62 | insert(pos, newValue, name) {
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| 63 | if (typeof newValue !== "string")
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| 64 | throw new Error(
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| 65 | "insertion must be a string, but is a " +
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| 66 | typeof newValue +
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| 67 | ": " +
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| 68 | newValue
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| 69 | );
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| 70 | this._replacements.push(new Replacement(pos, pos - 1, newValue, name));
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| 71 | this._isSorted = false;
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| 72 | }
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| 73 |
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| 74 | source() {
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| 75 | if (this._replacements.length === 0) {
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| 76 | return this._source.source();
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| 77 | }
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| 78 | let current = this._source.source();
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| 79 | let pos = 0;
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| 80 | const result = [];
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| 81 |
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| 82 | this._sortReplacements();
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| 83 | for (const replacement of this._replacements) {
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| 84 | const start = Math.floor(replacement.start);
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| 85 | const end = Math.floor(replacement.end + 1);
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| 86 | if (pos < start) {
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| 87 | const offset = start - pos;
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| 88 | result.push(current.slice(0, offset));
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| 89 | current = current.slice(offset);
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| 90 | pos = start;
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| 91 | }
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| 92 | result.push(replacement.content);
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| 93 | if (pos < end) {
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| 94 | const offset = end - pos;
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| 95 | current = current.slice(offset);
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| 96 | pos = end;
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| 97 | }
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| 98 | }
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| 99 | result.push(current);
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| 100 | return result.join("");
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| 101 | }
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| 102 |
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| 103 | map(options) {
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| 104 | if (this._replacements.length === 0) {
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| 105 | return this._source.map(options);
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| 106 | }
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| 107 | return getMap(this, options);
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| 108 | }
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| 109 |
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| 110 | sourceAndMap(options) {
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| 111 | if (this._replacements.length === 0) {
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| 112 | return this._source.sourceAndMap(options);
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| 113 | }
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| 114 | return getSourceAndMap(this, options);
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| 115 | }
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| 116 |
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| 117 | original() {
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| 118 | return this._source;
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| 119 | }
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| 120 |
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| 121 | _sortReplacements() {
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| 122 | if (this._isSorted) return;
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| 123 | if (hasStableSort) {
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| 124 | this._replacements.sort(function (a, b) {
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| 125 | const diff1 = a.start - b.start;
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| 126 | if (diff1 !== 0) return diff1;
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| 127 | const diff2 = a.end - b.end;
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| 128 | if (diff2 !== 0) return diff2;
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| 129 | return 0;
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| 130 | });
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| 131 | } else {
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| 132 | this._replacements.forEach((repl, i) => (repl.index = i));
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| 133 | this._replacements.sort(function (a, b) {
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| 134 | const diff1 = a.start - b.start;
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| 135 | if (diff1 !== 0) return diff1;
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| 136 | const diff2 = a.end - b.end;
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| 137 | if (diff2 !== 0) return diff2;
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| 138 | return a.index - b.index;
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| 139 | });
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| 140 | }
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| 141 | this._isSorted = true;
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| 142 | }
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| 143 |
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| 144 | streamChunks(options, onChunk, onSource, onName) {
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| 145 | this._sortReplacements();
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| 146 | const repls = this._replacements;
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| 147 | let pos = 0;
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| 148 | let i = 0;
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| 149 | let replacmentEnd = -1;
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| 150 | let nextReplacement =
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| 151 | i < repls.length ? Math.floor(repls[i].start) : MAX_SOURCE_POSITION;
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| 152 | let generatedLineOffset = 0;
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| 153 | let generatedColumnOffset = 0;
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| 154 | let generatedColumnOffsetLine = 0;
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| 155 | const sourceContents = [];
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| 156 | const nameMapping = new Map();
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| 157 | const nameIndexMapping = [];
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| 158 | const checkOriginalContent = (sourceIndex, line, column, expectedChunk) => {
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| 159 | let content =
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| 160 | sourceIndex < sourceContents.length
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| 161 | ? sourceContents[sourceIndex]
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| 162 | : undefined;
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| 163 | if (content === undefined) return false;
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| 164 | if (typeof content === "string") {
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| 165 | content = splitIntoLines(content);
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| 166 | sourceContents[sourceIndex] = content;
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| 167 | }
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| 168 | const contentLine = line <= content.length ? content[line - 1] : null;
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| 169 | if (contentLine === null) return false;
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| 170 | return (
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| 171 | contentLine.slice(column, column + expectedChunk.length) ===
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| 172 | expectedChunk
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| 173 | );
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| 174 | };
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| 175 | let { generatedLine, generatedColumn } = streamChunks(
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| 176 | this._source,
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| 177 | Object.assign({}, options, { finalSource: false }),
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| 178 | (
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| 179 | chunk,
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| 180 | generatedLine,
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| 181 | generatedColumn,
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| 182 | sourceIndex,
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| 183 | originalLine,
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| 184 | originalColumn,
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| 185 | nameIndex
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| 186 | ) => {
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| 187 | let chunkPos = 0;
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| 188 | let endPos = pos + chunk.length;
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| 189 |
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| 190 | // Skip over when it has been replaced
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| 191 | if (replacmentEnd > pos) {
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| 192 | // Skip over the whole chunk
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| 193 | if (replacmentEnd >= endPos) {
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| 194 | const line = generatedLine + generatedLineOffset;
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| 195 | if (chunk.endsWith("\n")) {
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| 196 | generatedLineOffset--;
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| 197 | if (generatedColumnOffsetLine === line) {
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| 198 | // undo exiting corrections form the current line
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| 199 | generatedColumnOffset += generatedColumn;
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| 200 | }
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| 201 | } else if (generatedColumnOffsetLine === line) {
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| 202 | generatedColumnOffset -= chunk.length;
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| 203 | } else {
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| 204 | generatedColumnOffset = -chunk.length;
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| 205 | generatedColumnOffsetLine = line;
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| 206 | }
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| 207 | pos = endPos;
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| 208 | return;
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| 209 | }
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| 210 |
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| 211 | // Partially skip over chunk
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| 212 | chunkPos = replacmentEnd - pos;
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| 213 | if (
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| 214 | checkOriginalContent(
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| 215 | sourceIndex,
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| 216 | originalLine,
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| 217 | originalColumn,
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| 218 | chunk.slice(0, chunkPos)
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| 219 | )
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| 220 | ) {
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| 221 | originalColumn += chunkPos;
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| 222 | }
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| 223 | pos += chunkPos;
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| 224 | const line = generatedLine + generatedLineOffset;
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| 225 | if (generatedColumnOffsetLine === line) {
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| 226 | generatedColumnOffset -= chunkPos;
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| 227 | } else {
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| 228 | generatedColumnOffset = -chunkPos;
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| 229 | generatedColumnOffsetLine = line;
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| 230 | }
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| 231 | generatedColumn += chunkPos;
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| 232 | }
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| 233 |
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| 234 | // Is a replacement in the chunk?
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| 235 | if (nextReplacement < endPos) {
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| 236 | do {
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| 237 | let line = generatedLine + generatedLineOffset;
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| 238 | if (nextReplacement > pos) {
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| 239 | // Emit chunk until replacement
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| 240 | const offset = nextReplacement - pos;
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| 241 | const chunkSlice = chunk.slice(chunkPos, chunkPos + offset);
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| 242 | onChunk(
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| 243 | chunkSlice,
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| 244 | line,
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| 245 | generatedColumn +
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| 246 | (line === generatedColumnOffsetLine
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| 247 | ? generatedColumnOffset
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| 248 | : 0),
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| 249 | sourceIndex,
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| 250 | originalLine,
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| 251 | originalColumn,
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| 252 | nameIndex < 0 || nameIndex >= nameIndexMapping.length
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| 253 | ? -1
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| 254 | : nameIndexMapping[nameIndex]
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| 255 | );
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| 256 | generatedColumn += offset;
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| 257 | chunkPos += offset;
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| 258 | pos = nextReplacement;
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| 259 | if (
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| 260 | checkOriginalContent(
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| 261 | sourceIndex,
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| 262 | originalLine,
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| 263 | originalColumn,
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| 264 | chunkSlice
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| 265 | )
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| 266 | ) {
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| 267 | originalColumn += chunkSlice.length;
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| 268 | }
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| 269 | }
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| 270 |
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| 271 | // Insert replacement content splitted into chunks by lines
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| 272 | const { content, name } = repls[i];
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| 273 | let matches = splitIntoLines(content);
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| 274 | let replacementNameIndex = nameIndex;
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| 275 | if (sourceIndex >= 0 && name) {
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| 276 | let globalIndex = nameMapping.get(name);
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| 277 | if (globalIndex === undefined) {
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| 278 | globalIndex = nameMapping.size;
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| 279 | nameMapping.set(name, globalIndex);
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| 280 | onName(globalIndex, name);
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| 281 | }
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| 282 | replacementNameIndex = globalIndex;
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| 283 | }
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| 284 | for (let m = 0; m < matches.length; m++) {
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| 285 | const contentLine = matches[m];
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| 286 | onChunk(
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| 287 | contentLine,
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| 288 | line,
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| 289 | generatedColumn +
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| 290 | (line === generatedColumnOffsetLine
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| 291 | ? generatedColumnOffset
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| 292 | : 0),
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| 293 | sourceIndex,
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| 294 | originalLine,
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| 295 | originalColumn,
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| 296 | replacementNameIndex
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| 297 | );
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| 298 |
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| 299 | // Only the first chunk has name assigned
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| 300 | replacementNameIndex = -1;
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| 301 |
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| 302 | if (m === matches.length - 1 && !contentLine.endsWith("\n")) {
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| 303 | if (generatedColumnOffsetLine === line) {
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| 304 | generatedColumnOffset += contentLine.length;
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| 305 | } else {
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| 306 | generatedColumnOffset = contentLine.length;
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| 307 | generatedColumnOffsetLine = line;
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| 308 | }
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| 309 | } else {
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| 310 | generatedLineOffset++;
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| 311 | line++;
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| 312 | generatedColumnOffset = -generatedColumn;
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| 313 | generatedColumnOffsetLine = line;
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| 314 | }
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| 315 | }
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| 316 |
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| 317 | // Remove replaced content by settings this variable
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| 318 | replacmentEnd = Math.max(
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| 319 | replacmentEnd,
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| 320 | Math.floor(repls[i].end + 1)
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| 321 | );
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| 322 |
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| 323 | // Move to next replacment
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| 324 | i++;
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| 325 | nextReplacement =
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| 326 | i < repls.length
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| 327 | ? Math.floor(repls[i].start)
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| 328 | : MAX_SOURCE_POSITION;
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| 329 |
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| 330 | // Skip over when it has been replaced
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| 331 | const offset = chunk.length - endPos + replacmentEnd - chunkPos;
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| 332 | if (offset > 0) {
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| 333 | // Skip over whole chunk
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| 334 | if (replacmentEnd >= endPos) {
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| 335 | let line = generatedLine + generatedLineOffset;
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| 336 | if (chunk.endsWith("\n")) {
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| 337 | generatedLineOffset--;
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| 338 | if (generatedColumnOffsetLine === line) {
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| 339 | // undo exiting corrections form the current line
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| 340 | generatedColumnOffset += generatedColumn;
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| 341 | }
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| 342 | } else if (generatedColumnOffsetLine === line) {
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| 343 | generatedColumnOffset -= chunk.length - chunkPos;
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| 344 | } else {
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| 345 | generatedColumnOffset = chunkPos - chunk.length;
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| 346 | generatedColumnOffsetLine = line;
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| 347 | }
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| 348 | pos = endPos;
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| 349 | return;
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| 350 | }
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| 351 |
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| 352 | // Partially skip over chunk
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| 353 | const line = generatedLine + generatedLineOffset;
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| 354 | if (
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| 355 | checkOriginalContent(
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| 356 | sourceIndex,
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| 357 | originalLine,
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| 358 | originalColumn,
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| 359 | chunk.slice(chunkPos, chunkPos + offset)
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| 360 | )
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| 361 | ) {
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| 362 | originalColumn += offset;
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| 363 | }
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| 364 | chunkPos += offset;
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| 365 | pos += offset;
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| 366 | if (generatedColumnOffsetLine === line) {
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| 367 | generatedColumnOffset -= offset;
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| 368 | } else {
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| 369 | generatedColumnOffset = -offset;
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| 370 | generatedColumnOffsetLine = line;
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| 371 | }
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| 372 | generatedColumn += offset;
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| 373 | }
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| 374 | } while (nextReplacement < endPos);
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| 375 | }
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| 376 |
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| 377 | // Emit remaining chunk
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| 378 | if (chunkPos < chunk.length) {
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| 379 | const chunkSlice = chunkPos === 0 ? chunk : chunk.slice(chunkPos);
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| 380 | const line = generatedLine + generatedLineOffset;
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| 381 | onChunk(
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| 382 | chunkSlice,
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| 383 | line,
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| 384 | generatedColumn +
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| 385 | (line === generatedColumnOffsetLine ? generatedColumnOffset : 0),
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| 386 | sourceIndex,
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| 387 | originalLine,
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| 388 | originalColumn,
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| 389 | nameIndex < 0 ? -1 : nameIndexMapping[nameIndex]
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| 390 | );
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| 391 | }
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| 392 | pos = endPos;
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| 393 | },
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| 394 | (sourceIndex, source, sourceContent) => {
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| 395 | while (sourceContents.length < sourceIndex)
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| 396 | sourceContents.push(undefined);
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| 397 | sourceContents[sourceIndex] = sourceContent;
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| 398 | onSource(sourceIndex, source, sourceContent);
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| 399 | },
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| 400 | (nameIndex, name) => {
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| 401 | let globalIndex = nameMapping.get(name);
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| 402 | if (globalIndex === undefined) {
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| 403 | globalIndex = nameMapping.size;
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| 404 | nameMapping.set(name, globalIndex);
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| 405 | onName(globalIndex, name);
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| 406 | }
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| 407 | nameIndexMapping[nameIndex] = globalIndex;
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| 408 | }
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| 409 | );
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| 410 |
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| 411 | // Handle remaining replacements
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| 412 | let remainer = "";
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| 413 | for (; i < repls.length; i++) {
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| 414 | remainer += repls[i].content;
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| 415 | }
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| 416 |
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| 417 | // Insert remaining replacements content splitted into chunks by lines
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| 418 | let line = generatedLine + generatedLineOffset;
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| 419 | let matches = splitIntoLines(remainer);
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| 420 | for (let m = 0; m < matches.length; m++) {
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| 421 | const contentLine = matches[m];
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| 422 | onChunk(
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| 423 | contentLine,
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| 424 | line,
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| 425 | generatedColumn +
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| 426 | (line === generatedColumnOffsetLine ? generatedColumnOffset : 0),
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| 427 | -1,
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| 428 | -1,
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| 429 | -1,
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| 430 | -1
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| 431 | );
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| 432 |
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| 433 | if (m === matches.length - 1 && !contentLine.endsWith("\n")) {
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| 434 | if (generatedColumnOffsetLine === line) {
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| 435 | generatedColumnOffset += contentLine.length;
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| 436 | } else {
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| 437 | generatedColumnOffset = contentLine.length;
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| 438 | generatedColumnOffsetLine = line;
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| 439 | }
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| 440 | } else {
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| 441 | generatedLineOffset++;
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| 442 | line++;
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| 443 | generatedColumnOffset = -generatedColumn;
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| 444 | generatedColumnOffsetLine = line;
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| 445 | }
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| 446 | }
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| 447 |
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| 448 | return {
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| 449 | generatedLine: line,
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| 450 | generatedColumn:
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| 451 | generatedColumn +
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| 452 | (line === generatedColumnOffsetLine ? generatedColumnOffset : 0)
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| 453 | };
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| 454 | }
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| 455 |
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| 456 | updateHash(hash) {
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| 457 | this._sortReplacements();
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| 458 | hash.update("ReplaceSource");
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| 459 | this._source.updateHash(hash);
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| 460 | hash.update(this._name || "");
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| 461 | for (const repl of this._replacements) {
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| 462 | hash.update(`${repl.start}${repl.end}${repl.content}${repl.name}`);
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| 463 | }
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| 464 | }
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| 465 | }
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| 466 |
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| 467 | module.exports = ReplaceSource;
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