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All rights reserved. Licensed under the MIT license.\n// See LICENSE in the project root for license information.\n\nimport * as path from 'path';\nimport { SourceMapConsumer, type RawSourceMap, type MappingItem, type Position } from 'source-map';\nimport { FileSystem, InternalError, JsonFile, NewlineKind } from '@rushstack/node-core-library';\nimport type ts from 'typescript';\n\ninterface ISourceMap {\n sourceMapConsumer: SourceMapConsumer;\n\n // SourceMapConsumer.originalPositionFor() is useless because the mapping contains numerous gaps,\n // and the API provides no way to find the nearest match. So instead we extract all the mapping items\n // and search them using SourceMapper._findNearestMappingItem().\n mappingItems: MappingItem[];\n}\n\ninterface IOriginalFileInfo {\n // Whether the .ts file exists\n fileExists: boolean;\n\n // This is used to check whether the guessed position is out of bounds.\n // Since column/line numbers are 1-based, the 0th item in this array is unused.\n maxColumnForLine: number[];\n}\n\nexport interface ISourceLocation {\n /**\n * The absolute path to the source file.\n */\n sourceFilePath: string;\n\n /**\n * The line number in the source file. The first line number is 1.\n */\n sourceFileLine: number;\n\n /**\n * The column number in the source file. The first column number is 1.\n */\n sourceFileColumn: number;\n}\n\nexport interface IGetSourceLocationOptions {\n /**\n * The source file to get the source location from.\n */\n sourceFile: ts.SourceFile;\n\n /**\n * The position within the source file to get the source location from.\n */\n pos: number;\n\n /**\n * If `false` or not provided, then we attempt to follow source maps in order to resolve the\n * location to the original `.ts` file. If resolution isn't possible for some reason, we fall\n * back to the `.d.ts` location.\n *\n * If `true`, then we don't bother following source maps, and the location refers to the `.d.ts`\n * location.\n */\n useDtsLocation?: boolean;\n}\n\nexport class SourceMapper {\n // Map from .d.ts file path --> ISourceMap if a source map was found, or null if not found\n private _sourceMapByFilePath: Map<string, ISourceMap | null> = new Map<string, ISourceMap | null>();\n\n // Cache the FileSystem.exists() result for mapped .ts files\n private _originalFileInfoByPath: Map<string, IOriginalFileInfo> = new Map<string, IOriginalFileInfo>();\n\n /**\n * Given a `.d.ts` source file and a specific position within the file, return the corresponding\n * `ISourceLocation`.\n */\n public getSourceLocation(options: IGetSourceLocationOptions): ISourceLocation {\n const lineAndCharacter: ts.LineAndCharacter = options.sourceFile.getLineAndCharacterOfPosition(\n options.pos\n );\n const sourceLocation: ISourceLocation = {\n sourceFilePath: options.sourceFile.fileName,\n sourceFileLine: lineAndCharacter.line + 1,\n sourceFileColumn: lineAndCharacter.character + 1\n };\n\n if (options.useDtsLocation) {\n return sourceLocation;\n }\n\n const mappedSourceLocation: ISourceLocation | undefined = this._getMappedSourceLocation(sourceLocation);\n return mappedSourceLocation || sourceLocation;\n }\n\n private _getMappedSourceLocation(sourceLocation: ISourceLocation): ISourceLocation | undefined {\n const { sourceFilePath, sourceFileLine, sourceFileColumn } = sourceLocation;\n\n if (!FileSystem.exists(sourceFilePath)) {\n // Sanity check\n throw new InternalError('The referenced path was not found: ' + sourceFilePath);\n }\n\n const sourceMap: ISourceMap | null = this._getSourceMap(sourceFilePath);\n if (!sourceMap) return;\n\n const nearestMappingItem: MappingItem | undefined = SourceMapper._findNearestMappingItem(\n sourceMap.mappingItems,\n {\n line: sourceFileLine,\n column: sourceFileColumn\n }\n );\n\n if (!nearestMappingItem) return;\n\n const mappedFilePath: string = path.resolve(path.dirname(sourceFilePath), nearestMappingItem.source);\n\n // Does the mapped filename exist? Use a cache to remember the answer.\n let originalFileInfo: IOriginalFileInfo | undefined = this._originalFileInfoByPath.get(mappedFilePath);\n if (originalFileInfo === undefined) {\n originalFileInfo = {\n fileExists: FileSystem.exists(mappedFilePath),\n maxColumnForLine: []\n };\n\n if (originalFileInfo.fileExists) {\n // Read the file and measure the length of each line\n originalFileInfo.maxColumnForLine = FileSystem.readFile(mappedFilePath, {\n convertLineEndings: NewlineKind.Lf\n })\n .split('\\n')\n .map((x) => x.length + 1); // +1 since columns are 1-based\n originalFileInfo.maxColumnForLine.unshift(0); // Extra item since lines are 1-based\n }\n\n this._originalFileInfoByPath.set(mappedFilePath, originalFileInfo);\n }\n\n // Don't translate coordinates to a file that doesn't exist\n if (!originalFileInfo.fileExists) return;\n\n // The nearestMappingItem anchor may be above/left of the real position, due to gaps in the mapping. Calculate\n // the delta and apply it to the original position.\n const guessedPosition: Position = {\n line: nearestMappingItem.originalLine + sourceFileLine - nearestMappingItem.generatedLine,\n column: nearestMappingItem.originalColumn + sourceFileColumn - nearestMappingItem.generatedColumn\n };\n\n // Verify that the result is not out of bounds, in cause our heuristic failed\n if (\n guessedPosition.line >= 1 &&\n guessedPosition.line < originalFileInfo.maxColumnForLine.length &&\n guessedPosition.column >= 1 &&\n guessedPosition.column <= originalFileInfo.maxColumnForLine[guessedPosition.line]\n ) {\n return {\n sourceFilePath: mappedFilePath,\n sourceFileLine: guessedPosition.line,\n sourceFileColumn: guessedPosition.column\n };\n } else {\n // The guessed position was out of bounds, so use the nearestMappingItem position instead.\n return {\n sourceFilePath: mappedFilePath,\n sourceFileLine: nearestMappingItem.originalLine,\n sourceFileColumn: nearestMappingItem.originalColumn\n };\n }\n }\n\n private _getSourceMap(sourceFilePath: string): ISourceMap | null {\n let sourceMap: ISourceMap | null | undefined = this._sourceMapByFilePath.get(sourceFilePath);\n\n if (sourceMap === undefined) {\n // Normalize the path and redo the lookup\n const normalizedPath: string = FileSystem.getRealPath(sourceFilePath);\n\n sourceMap = this._sourceMapByFilePath.get(normalizedPath);\n if (sourceMap !== undefined) {\n // Copy the result from the normalized to the non-normalized key\n this._sourceMapByFilePath.set(sourceFilePath, sourceMap);\n } else {\n // Given \"folder/file.d.ts\", check for a corresponding \"folder/file.d.ts.map\"\n const sourceMapPath: string = normalizedPath + '.map';\n if (FileSystem.exists(sourceMapPath)) {\n // Load up the source map\n const rawSourceMap: RawSourceMap = JsonFile.load(sourceMapPath) as RawSourceMap;\n\n const sourceMapConsumer: SourceMapConsumer = new SourceMapConsumer(rawSourceMap);\n const mappingItems: MappingItem[] = [];\n\n // Extract the list of mapping items\n sourceMapConsumer.eachMapping(\n (mappingItem: MappingItem) => {\n mappingItems.push({\n ...mappingItem,\n // The \"source-map\" package inexplicably uses 1-based line numbers but 0-based column numbers.\n // Fix that up proactively so we don't have to deal with it later.\n generatedColumn: mappingItem.generatedColumn + 1,\n originalColumn: mappingItem.originalColumn + 1\n });\n },\n this,\n SourceMapConsumer.GENERATED_ORDER\n );\n\n sourceMap = { sourceMapConsumer, mappingItems };\n } else {\n // No source map for this filename\n sourceMap = null;\n }\n\n this._sourceMapByFilePath.set(normalizedPath, sourceMap);\n if (sourceFilePath !== normalizedPath) {\n // Add both keys to the map\n this._sourceMapByFilePath.set(sourceFilePath, sourceMap);\n }\n }\n }\n\n return sourceMap;\n }\n\n // The `mappingItems` array is sorted by generatedLine/generatedColumn (GENERATED_ORDER).\n // The _findNearestMappingItem() lookup is a simple binary search that returns the previous item\n // if there is no exact match.\n private static _findNearestMappingItem(\n mappingItems: MappingItem[],\n position: Position\n ): MappingItem | undefined {\n if (mappingItems.length === 0) {\n return undefined;\n }\n\n let startIndex: number = 0;\n let endIndex: number = mappingItems.length - 1;\n\n while (startIndex <= endIndex) {\n const middleIndex: number = startIndex + Math.floor((endIndex - startIndex) / 2);\n\n const diff: number = SourceMapper._compareMappingItem(mappingItems[middleIndex], position);\n\n if (diff < 0) {\n startIndex = middleIndex + 1;\n } else if (diff > 0) {\n endIndex = middleIndex - 1;\n } else {\n // Exact match\n return mappingItems[middleIndex];\n }\n }\n\n // If we didn't find an exact match, then endIndex < startIndex.\n // Take endIndex because it's the smaller value.\n return mappingItems[endIndex];\n }\n\n private static _compareMappingItem(mappingItem: MappingItem, position: Position): number {\n const diff: number = mappingItem.generatedLine - position.line;\n if (diff !== 0) {\n return diff;\n }\n return mappingItem.generatedColumn - position.column;\n }\n}\n"]} |