flow like the river
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BACK_BACK/node_modules/parcel-bundler/lib/SourceMap.js
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BACK_BACK/node_modules/parcel-bundler/lib/SourceMap.js
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"use strict";
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var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
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var _asyncToGenerator2 = _interopRequireDefault(require("@babel/runtime/helpers/asyncToGenerator"));
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const _require = require('source-map'),
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SourceMapConsumer = _require.SourceMapConsumer,
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SourceMapGenerator = _require.SourceMapGenerator;
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const lineCounter = require('./utils/lineCounter');
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class SourceMap {
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constructor(mappings, sources) {
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this.mappings = this.purifyMappings(mappings);
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this.sources = sources || {};
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this.lineCount = null;
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}
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purifyMappings(mappings) {
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if (Array.isArray(mappings)) {
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return mappings.filter(mapping => mapping && typeof mapping.original === 'object' && (mapping.original === null || typeof mapping.original.line === 'number' && mapping.original.line > 0 && typeof mapping.original.column === 'number' && mapping.source) && mapping.generated && typeof mapping.generated.line === 'number' && mapping.generated.line > 0 && typeof mapping.generated.column === 'number');
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}
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return [];
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}
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getConsumer(map) {
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return (0, _asyncToGenerator2.default)(function* () {
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if (map instanceof SourceMapConsumer) {
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return map;
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}
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map = typeof map === 'string' ? JSON.parse(map) : map;
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if (map.sourceRoot) delete map.sourceRoot;
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return new SourceMapConsumer(map);
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})();
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}
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addMap(map, lineOffset = 0, columnOffset = 0) {
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var _this = this;
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return (0, _asyncToGenerator2.default)(function* () {
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if (typeof map === 'string' || typeof map === 'object' && map.version) {
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let consumer = yield _this.getConsumer(map);
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if (!consumer) return _this;
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consumer.eachMapping(mapping => {
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_this.addConsumerMapping(mapping, lineOffset, columnOffset);
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if (!_this.sources[mapping.source]) {
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_this.sources[mapping.source] = consumer.sourceContentFor(mapping.source, true);
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}
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});
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if (consumer.destroy) {
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// Only needs to happen in source-map 0.7
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consumer.destroy();
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}
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} else if (map.mappings && map.sources) {
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if (!map.eachMapping) {
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map = new SourceMap(map.mappings, map.sources);
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}
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if (lineOffset === 0 && columnOffset === 0) {
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_this.mappings = _this.mappings.concat(map.mappings);
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} else {
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map.eachMapping(mapping => {
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_this.addMapping(mapping, lineOffset, columnOffset);
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});
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}
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Object.keys(map.sources).forEach(sourceName => {
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if (!_this.sources[sourceName]) {
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_this.sources[sourceName] = map.sources[sourceName];
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}
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});
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}
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return _this;
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})();
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}
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addMapping(mapping, lineOffset = 0, columnOffset = 0) {
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this.mappings.push({
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source: mapping.source,
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name: mapping.name,
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original: mapping.original,
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generated: {
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line: mapping.generated.line + lineOffset,
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column: mapping.generated.column + columnOffset
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}
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});
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}
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addConsumerMapping(mapping, lineOffset = 0, columnOffset = 0) {
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let original = null;
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if (typeof mapping.originalLine === 'number' && mapping.originalLine > 0 && typeof mapping.originalColumn === 'number') {
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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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}
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this.mappings.push({
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source: original ? mapping.source : null,
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name: mapping.name,
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original,
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generated: {
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line: mapping.generatedLine + lineOffset,
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column: mapping.generatedColumn + columnOffset
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}
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});
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}
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eachMapping(callback) {
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this.mappings.forEach(callback);
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}
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generateEmptyMap(sourceName, sourceContent) {
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this.sources[sourceName] = sourceContent;
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this.lineCount = lineCounter(sourceContent);
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for (let line = 1; line < this.lineCount + 1; line++) {
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this.addMapping({
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source: sourceName,
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original: {
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line: line,
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column: 0
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},
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generated: {
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line: line,
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column: 0
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}
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});
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}
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return this;
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}
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extendSourceMap(original, extension) {
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var _this2 = this;
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return (0, _asyncToGenerator2.default)(function* () {
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if (!(extension instanceof SourceMap)) {
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extension = yield new SourceMap().addMap(extension);
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}
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if (!(original instanceof SourceMap)) {
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original = yield _this2.getConsumer(original);
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}
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extension.eachMapping(mapping => {
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let originalMapping = original.originalPositionFor({
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line: mapping.original.line,
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column: mapping.original.column
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});
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if (!originalMapping || !originalMapping.line) {
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return;
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}
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_this2.addMapping({
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source: originalMapping.source,
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name: originalMapping.name,
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original: {
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line: originalMapping.line,
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column: originalMapping.column
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},
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generated: {
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line: mapping.generated.line,
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column: mapping.generated.column
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}
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});
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if (!_this2.sources[originalMapping.source]) {
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_this2.sources[originalMapping.source] = original.sourceContentFor(originalMapping.source, true);
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}
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});
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if (original.destroy) {
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// Only needs to happen in source-map 0.7
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original.destroy();
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}
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return _this2;
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})();
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}
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findClosestGenerated(line, column) {
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if (line < 1) {
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throw new Error('Line numbers must be >= 1');
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}
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if (column < 0) {
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throw new Error('Column numbers must be >= 0');
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}
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if (this.mappings.length < 1) {
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return undefined;
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}
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let startIndex = 0;
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let stopIndex = this.mappings.length - 1;
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let middleIndex = stopIndex + startIndex >>> 1;
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while (startIndex < stopIndex && this.mappings[middleIndex].generated.line !== line) {
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let mid = this.mappings[middleIndex].generated.line;
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if (line < mid) {
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stopIndex = middleIndex - 1;
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} else if (line > mid) {
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startIndex = middleIndex + 1;
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}
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middleIndex = stopIndex + startIndex >>> 1;
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}
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let mapping = this.mappings[middleIndex];
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if (!mapping || mapping.generated.line !== line) {
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return this.mappings.length - 1;
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}
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while (middleIndex >= 1 && this.mappings[middleIndex - 1].generated.line === line) {
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middleIndex--;
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}
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while (middleIndex < this.mappings.length - 1 && this.mappings[middleIndex + 1].generated.line === line && column > this.mappings[middleIndex].generated.column) {
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middleIndex++;
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}
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return middleIndex;
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}
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findClosest(line, column, key) {
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if (line < 1) {
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throw new Error('Line numbers must be >= 1');
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}
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if (column < 0) {
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throw new Error('Column numbers must be >= 0');
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}
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if (this.mappings.length < 1) {
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return undefined;
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}
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let startIndex = 0;
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let stopIndex = this.mappings.length - 1;
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let middleIndex = Math.floor((stopIndex + startIndex) / 2);
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while (startIndex < stopIndex && this.mappings[middleIndex][key].line !== line) {
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if (line < this.mappings[middleIndex][key].line) {
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stopIndex = middleIndex - 1;
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} else if (line > this.mappings[middleIndex][key].line) {
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startIndex = middleIndex + 1;
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}
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middleIndex = Math.floor((stopIndex + startIndex) / 2);
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}
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var mapping = this.mappings[middleIndex];
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if (!mapping || mapping[key].line !== line) {
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return this.mappings.length - 1;
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}
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while (middleIndex >= 1 && this.mappings[middleIndex - 1][key].line === line) {
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middleIndex--;
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}
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while (middleIndex < this.mappings.length - 1 && this.mappings[middleIndex + 1][key].line === line && column > this.mappings[middleIndex][key].column) {
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middleIndex++;
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}
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return middleIndex;
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}
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originalPositionFor(generatedPosition) {
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let index = this.findClosestGenerated(generatedPosition.line, generatedPosition.column);
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let mapping = this.mappings[index];
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if (!mapping || !mapping.original) {
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return null;
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}
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return {
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source: mapping.source,
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name: mapping.name,
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line: mapping.original.line,
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column: mapping.original.column
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};
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}
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generatedPositionFor(originalPosition) {
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let index = this.findClosest(originalPosition.line, originalPosition.column, 'original');
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let mapping = this.mappings[index];
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return {
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source: mapping.source,
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name: mapping.name,
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line: mapping.generated.line,
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column: mapping.generated.column
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};
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}
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sourceContentFor(fileName) {
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return this.sources[fileName];
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}
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offset(lineOffset = 0, columnOffset = 0) {
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this.mappings.map(mapping => {
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mapping.generated.line = mapping.generated.line + lineOffset;
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mapping.generated.column = mapping.generated.column + columnOffset;
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return mapping;
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});
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if (this.lineCount != null) {
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this.lineCount += lineOffset;
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}
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}
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stringify(file, sourceRoot) {
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let generator = new SourceMapGenerator({
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file,
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sourceRoot
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});
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this.eachMapping(mapping => generator.addMapping(mapping));
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Object.keys(this.sources).forEach(sourceName => generator.setSourceContent(sourceName, this.sources[sourceName]));
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return generator.toString();
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}
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}
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module.exports = SourceMap;
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