99 lines
3.6 KiB
JavaScript
99 lines
3.6 KiB
JavaScript
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"use strict";
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/*
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Copyright 2019 Google LLC
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Use of this source code is governed by an MIT-style
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license that can be found in the LICENSE file or at
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https://opensource.org/licenses/MIT.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.replaceAndUpdateSourceMap = void 0;
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const source_map_1 = require("source-map");
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/**
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* Adapted from https://github.com/nsams/sourcemap-aware-replace, with modern
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* JavaScript updates, along with additional properties copied from originalMap.
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*
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* @param {Object} options
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* @param {string} options.jsFilename The name for the file whose contents
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* correspond to originalSource.
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* @param {Object} options.originalMap The sourcemap for originalSource,
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* prior to any replacements.
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* @param {string} options.originalSource The source code, prior to any
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* replacements.
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* @param {string} options.replaceString A string to swap in for searchString.
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* @param {string} options.searchString A string in originalSource to replace.
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* Only the first occurrence will be replaced.
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* @return {{source: string, map: string}} An object containing both
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* originalSource with the replacement applied, and the modified originalMap.
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*
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* @private
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*/
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async function replaceAndUpdateSourceMap({ jsFilename, originalMap, originalSource, replaceString, searchString, }) {
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const generator = new source_map_1.SourceMapGenerator({
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file: jsFilename,
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});
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const consumer = await new source_map_1.SourceMapConsumer(originalMap);
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let pos;
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let src = originalSource;
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const replacements = [];
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let lineNum = 0;
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let filePos = 0;
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const lines = src.split('\n');
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for (let line of lines) {
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lineNum++;
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let searchPos = 0;
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while ((pos = line.indexOf(searchString, searchPos)) !== -1) {
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src =
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src.substring(0, filePos + pos) +
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replaceString +
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src.substring(filePos + pos + searchString.length);
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line =
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line.substring(0, pos) +
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replaceString +
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line.substring(pos + searchString.length);
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replacements.push({ line: lineNum, column: pos });
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searchPos = pos + replaceString.length;
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}
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filePos += line.length + 1;
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}
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replacements.reverse();
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consumer.eachMapping((mapping) => {
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for (const replacement of replacements) {
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if (replacement.line === mapping.generatedLine &&
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mapping.generatedColumn > replacement.column) {
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const offset = searchString.length - replaceString.length;
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mapping.generatedColumn -= offset;
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}
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}
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if (mapping.source) {
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const newMapping = {
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generated: {
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line: mapping.generatedLine,
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column: mapping.generatedColumn,
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},
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original: {
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line: mapping.originalLine,
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column: mapping.originalColumn,
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},
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source: mapping.source,
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};
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return generator.addMapping(newMapping);
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}
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return mapping;
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});
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consumer.destroy();
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// JSON.parse returns any.
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// eslint-disable-next-line @typescript-eslint/no-unsafe-assignment
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const updatedSourceMap = Object.assign(JSON.parse(generator.toString()), {
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names: originalMap.names,
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sourceRoot: originalMap.sourceRoot,
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sources: originalMap.sources,
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sourcesContent: originalMap.sourcesContent,
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});
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return {
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map: JSON.stringify(updatedSourceMap),
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source: src,
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};
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}
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exports.replaceAndUpdateSourceMap = replaceAndUpdateSourceMap;
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