122 lines
2.9 KiB
Plaintext
122 lines
2.9 KiB
Plaintext
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow
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* @format
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*/
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'use strict';
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// eslint-disable-next-line lint/sort-requires
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const Consumer = require('./Consumer');
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const {SourceMapGenerator} = require('source-map');
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import type {IConsumer, MixedSourceMap} from './source-map';
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import type {Number0, Number1} from 'ob1';
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// Originally based on https://github.com/jakobwesthoff/source-map-merger
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function composeSourceMaps(
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maps: $ReadOnlyArray<MixedSourceMap>,
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): MixedSourceMap {
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// NOTE: require() here to break dependency cycle
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const SourceMetadataMapConsumer = require('metro-symbolicate/src/SourceMetadataMapConsumer');
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if (maps.length < 1) {
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throw new Error('composeSourceMaps: Expected at least one map');
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}
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const firstMap = maps[0];
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const consumers = maps
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.map(function(map) {
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return new Consumer(map);
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})
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.reverse();
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const generator = new SourceMapGenerator({
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file: consumers[0].file,
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});
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consumers[0].eachMapping(mapping => {
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const original = findOriginalPosition(
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consumers,
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mapping.generatedLine,
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mapping.generatedColumn,
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);
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generator.addMapping({
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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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original.line != null
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? {
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line: original.line,
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column: original.column,
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}
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: null,
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source: original.source,
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name: original.name,
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});
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});
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const composedMap = generator.toJSON();
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const metadataConsumer = new SourceMetadataMapConsumer(firstMap);
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composedMap.x_facebook_sources = metadataConsumer.toArray(
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composedMap.sources,
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);
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const function_offsets = maps[maps.length - 1].x_hermes_function_offsets;
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if (function_offsets) {
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composedMap.x_hermes_function_offsets = function_offsets;
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}
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return composedMap;
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}
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function findOriginalPosition(
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consumers: $ReadOnlyArray<IConsumer>,
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generatedLine: Number1,
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generatedColumn: Number0,
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): {
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line: ?number,
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column: ?number,
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source: ?string,
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name: ?string,
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...
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} {
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let currentLine = generatedLine;
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let currentColumn = generatedColumn;
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let original = {
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line: null,
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column: null,
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source: null,
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name: null,
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};
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for (const consumer of consumers) {
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if (currentLine == null || currentColumn == null) {
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return {line: null, column: null, source: null, name: null};
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}
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original = consumer.originalPositionFor({
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line: currentLine,
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column: currentColumn,
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});
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currentLine = original.line;
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currentColumn = original.column;
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if (currentLine == null) {
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return {
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line: null,
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column: null,
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source: null,
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name: null,
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};
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}
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}
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return original;
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}
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module.exports = composeSourceMaps;
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