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Copy pathsourcemapDecoder.ts
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378 lines (333 loc) · 16.5 KB
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/* @internal */
namespace ts {
export interface SourceFileLikeCache {
get(path: Path): SourceFileLike | undefined;
}
export function createSourceFileLikeCache(host: { readFile?: (path: string) => string | undefined, fileExists?: (path: string) => boolean }): SourceFileLikeCache {
const cached = createMap<SourceFileLike>();
return {
get(path: Path) {
if (cached.has(path)) {
return cached.get(path);
}
if (!host.fileExists || !host.readFile || !host.fileExists(path)) return;
// And failing that, check the disk
const text = host.readFile(path)!; // TODO: GH#18217
const file = {
text,
lineMap: undefined,
getLineAndCharacterOfPosition(pos: number) {
return computeLineAndCharacterOfPosition(getLineStarts(this), pos);
}
} as SourceFileLike;
cached.set(path, file);
return file;
}
};
}
}
/* @internal */
namespace ts.sourcemaps {
export interface SourceMapData {
version?: number;
file?: string;
sourceRoot?: string;
sources: string[];
sourcesContent?: (string | null)[];
names?: string[];
mappings: string;
}
export interface SourceMappableLocation {
fileName: string;
position: number;
}
export interface SourceMapper {
getOriginalPosition(input: SourceMappableLocation): SourceMappableLocation;
getGeneratedPosition(input: SourceMappableLocation): SourceMappableLocation;
}
export const identitySourceMapper = { getOriginalPosition: identity, getGeneratedPosition: identity };
export interface SourceMapDecodeHost {
readFile(path: string): string | undefined;
fileExists(path: string): boolean;
getCanonicalFileName(path: string): string;
log(text: string): void;
useCaseSensitiveFileNames: boolean;
}
export function decode(host: SourceMapDecodeHost, mapPath: string, map: SourceMapData, program?: Program, fallbackCache = createSourceFileLikeCache(host)): SourceMapper {
const currentDirectory = getDirectoryPath(mapPath);
const sourceRoot = map.sourceRoot ? getNormalizedAbsolutePath(map.sourceRoot, currentDirectory) : currentDirectory;
let decodedMappings: ProcessedSourceMapPosition[];
let generatedOrderedMappings: ProcessedSourceMapPosition[];
let sourceOrderedMappings: ProcessedSourceMapPosition[];
return {
getOriginalPosition,
getGeneratedPosition
};
function getGeneratedPosition(loc: SourceMappableLocation): SourceMappableLocation {
const maps = getSourceOrderedMappings();
if (!length(maps)) return loc;
let targetIndex = binarySearch(maps, { sourcePath: loc.fileName, sourcePosition: loc.position }, identity, compareProcessedPositionSourcePositions);
if (targetIndex < 0 && maps.length > 0) {
// if no exact match, closest is 2's compliment of result
targetIndex = ~targetIndex;
}
if (!maps[targetIndex] || comparePaths(loc.fileName, maps[targetIndex].sourcePath, sourceRoot, !host.useCaseSensitiveFileNames) !== 0) {
return loc;
}
return { fileName: toPath(map.file!, sourceRoot, host.getCanonicalFileName), position: maps[targetIndex].emittedPosition }; // Closest pos
}
function getOriginalPosition(loc: SourceMappableLocation): SourceMappableLocation {
const maps = getGeneratedOrderedMappings();
if (!length(maps)) return loc;
let targetIndex = binarySearch(maps, { emittedPosition: loc.position }, identity, compareProcessedPositionEmittedPositions);
if (targetIndex < 0 && maps.length > 0) {
// if no exact match, closest is 2's compliment of result
targetIndex = ~targetIndex;
}
return { fileName: toPath(maps[targetIndex].sourcePath, sourceRoot, host.getCanonicalFileName), position: maps[targetIndex].sourcePosition }; // Closest pos
}
function getSourceFileLike(fileName: string, location: string): SourceFileLike | undefined {
// Lookup file in program, if provided
const path = toPath(fileName, location, host.getCanonicalFileName);
const file = program && program.getSourceFile(path);
// file returned here could be .d.ts when asked for .ts file if projectReferences and module resolution created this source file
if (!file || file.resolvedPath !== path) {
// Otherwise check the cache (which may hit disk)
return fallbackCache.get(path);
}
return file;
}
function getPositionOfLineAndCharacterUsingName(fileName: string, directory: string, line: number, character: number) {
const file = getSourceFileLike(fileName, directory);
if (!file) {
return -1;
}
return getPositionOfLineAndCharacter(file, line, character);
}
function getDecodedMappings() {
return decodedMappings || (decodedMappings = calculateDecodedMappings(map, processPosition, host));
}
function getSourceOrderedMappings() {
return sourceOrderedMappings || (sourceOrderedMappings = getDecodedMappings().slice().sort(compareProcessedPositionSourcePositions));
}
function getGeneratedOrderedMappings() {
return generatedOrderedMappings || (generatedOrderedMappings = getDecodedMappings().slice().sort(compareProcessedPositionEmittedPositions));
}
function compareProcessedPositionSourcePositions(a: ProcessedSourceMapPosition, b: ProcessedSourceMapPosition) {
return comparePaths(a.sourcePath, b.sourcePath, sourceRoot, !host.useCaseSensitiveFileNames) ||
compareValues(a.sourcePosition, b.sourcePosition);
}
function compareProcessedPositionEmittedPositions(a: ProcessedSourceMapPosition, b: ProcessedSourceMapPosition) {
return compareValues(a.emittedPosition, b.emittedPosition);
}
function processPosition(position: RawSourceMapPosition): ProcessedSourceMapPosition {
const sourcePath = map.sources[position.sourceIndex];
return {
emittedPosition: getPositionOfLineAndCharacterUsingName(map.file!, currentDirectory, position.emittedLine, position.emittedColumn),
sourcePosition: getPositionOfLineAndCharacterUsingName(sourcePath, sourceRoot, position.sourceLine, position.sourceColumn),
sourcePath,
// TODO: Consider using `name` field to remap the expected identifier to scan for renames to handle another tool renaming oout output
// name: position.nameIndex ? map.names[position.nameIndex] : undefined
};
}
}
/*@internal*/
export interface MappingsDecoder extends Iterator<SourceMapSpan> {
readonly decodingIndex: number;
readonly error: string | undefined;
readonly lastSpan: SourceMapSpan;
}
/*@internal*/
export function decodeMappings(map: SourceMapData): MappingsDecoder {
const state: DecoderState = {
encodedText: map.mappings,
currentNameIndex: undefined,
sourceMapNamesLength: map.names ? map.names.length : undefined,
currentEmittedColumn: 0,
currentEmittedLine: 0,
currentSourceColumn: 0,
currentSourceLine: 0,
currentSourceIndex: 0,
decodingIndex: 0
};
function captureSpan(): SourceMapSpan {
return {
emittedColumn: state.currentEmittedColumn,
emittedLine: state.currentEmittedLine,
sourceColumn: state.currentSourceColumn,
sourceIndex: state.currentSourceIndex,
sourceLine: state.currentSourceLine,
nameIndex: state.currentNameIndex
};
}
return {
get decodingIndex() { return state.decodingIndex; },
get error() { return state.error; },
get lastSpan() { return captureSpan(); },
next() {
if (hasCompletedDecoding(state) || state.error) return { done: true, value: undefined as never };
if (!decodeSinglePosition(state)) return { done: true, value: undefined as never };
return { done: false, value: captureSpan() };
}
};
}
function calculateDecodedMappings<T>(map: SourceMapData, processPosition: (position: RawSourceMapPosition) => T, host?: { log?(s: string): void }): T[] {
const decoder = decodeMappings(map);
const positions = arrayFrom(decoder, processPosition);
if (decoder.error) {
if (host && host.log) {
host.log(`Encountered error while decoding sourcemap: ${decoder.error}`);
}
return [];
}
return positions;
}
interface ProcessedSourceMapPosition {
emittedPosition: number;
sourcePosition: number;
sourcePath: string;
}
interface RawSourceMapPosition {
emittedLine: number;
emittedColumn: number;
sourceLine: number;
sourceColumn: number;
sourceIndex: number;
nameIndex?: number;
}
interface DecoderState {
decodingIndex: number;
currentEmittedLine: number;
currentEmittedColumn: number;
currentSourceLine: number;
currentSourceColumn: number;
currentSourceIndex: number;
currentNameIndex: number | undefined;
encodedText: string;
sourceMapNamesLength?: number;
error?: string;
}
function hasCompletedDecoding(state: DecoderState) {
return state.decodingIndex === state.encodedText.length;
}
function decodeSinglePosition(state: DecoderState): boolean {
while (state.decodingIndex < state.encodedText.length) {
const char = state.encodedText.charCodeAt(state.decodingIndex);
if (char === CharacterCodes.semicolon) {
// New line
state.currentEmittedLine++;
state.currentEmittedColumn = 0;
state.decodingIndex++;
continue;
}
if (char === CharacterCodes.comma) {
// Next entry is on same line - no action needed
state.decodingIndex++;
continue;
}
// Read the current position
// 1. Column offset from prev read jsColumn
state.currentEmittedColumn += base64VLQFormatDecode();
// Incorrect emittedColumn dont support this map
if (createErrorIfCondition(state.currentEmittedColumn < 0, "Invalid emittedColumn found")) {
return false;
}
// Dont support reading mappings that dont have information about original source and its line numbers
if (createErrorIfCondition(isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex), "Unsupported Error Format: No entries after emitted column")) {
return false;
}
// 2. Relative sourceIndex
state.currentSourceIndex += base64VLQFormatDecode();
// Incorrect sourceIndex dont support this map
if (createErrorIfCondition(state.currentSourceIndex < 0, "Invalid sourceIndex found")) {
return false;
}
// Dont support reading mappings that dont have information about original source position
if (createErrorIfCondition(isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex), "Unsupported Error Format: No entries after sourceIndex")) {
return false;
}
// 3. Relative sourceLine 0 based
state.currentSourceLine += base64VLQFormatDecode();
// Incorrect sourceLine dont support this map
if (createErrorIfCondition(state.currentSourceLine < 0, "Invalid sourceLine found")) {
return false;
}
// Dont support reading mappings that dont have information about original source and its line numbers
if (createErrorIfCondition(isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex), "Unsupported Error Format: No entries after emitted Line")) {
return false;
}
// 4. Relative sourceColumn 0 based
state.currentSourceColumn += base64VLQFormatDecode();
// Incorrect sourceColumn dont support this map
if (createErrorIfCondition(state.currentSourceColumn < 0, "Invalid sourceLine found")) {
return false;
}
// 5. Check if there is name:
if (!isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex)) {
if (state.currentNameIndex === undefined) {
state.currentNameIndex = 0;
}
state.currentNameIndex += base64VLQFormatDecode();
// Incorrect nameIndex dont support this map
// TODO: If we start using `name`s, issue errors when they aren't correct in the sourcemap
// if (createErrorIfCondition(state.currentNameIndex < 0 || state.currentNameIndex >= state.sourceMapNamesLength, "Invalid name index for the source map entry")) {
// return;
// }
}
// Dont support reading mappings that dont have information about original source and its line numbers
if (createErrorIfCondition(!isSourceMappingSegmentEnd(state.encodedText, state.decodingIndex), "Unsupported Error Format: There are more entries after " + (state.currentNameIndex === undefined ? "sourceColumn" : "nameIndex"))) {
return false;
}
// Entry should be complete
return true;
}
createErrorIfCondition(/*condition*/ true, "No encoded entry found");
return false;
function createErrorIfCondition(condition: boolean, errormsg: string) {
if (state.error) {
// An error was already reported
return true;
}
if (condition) {
state.error = errormsg;
}
return condition;
}
function base64VLQFormatDecode(): number {
let moreDigits = true;
let shiftCount = 0;
let value = 0;
for (; moreDigits; state.decodingIndex++) {
if (createErrorIfCondition(state.decodingIndex >= state.encodedText.length, "Error in decoding base64VLQFormatDecode, past the mapping string")) {
return undefined!; // TODO: GH#18217
}
// 6 digit number
const currentByte = base64FormatDecode(state.encodedText.charAt(state.decodingIndex));
// If msb is set, we still have more bits to continue
moreDigits = (currentByte & 32) !== 0;
// least significant 5 bits are the next msbs in the final value.
value = value | ((currentByte & 31) << shiftCount);
shiftCount += 5;
}
// Least significant bit if 1 represents negative and rest of the msb is actual absolute value
if ((value & 1) === 0) {
// + number
value = value >> 1;
}
else {
// - number
value = value >> 1;
value = -value;
}
return value;
}
}
function base64FormatDecode(char: string) {
return "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/".indexOf(char);
}
function isSourceMappingSegmentEnd(encodedText: string, pos: number) {
return (pos === encodedText.length ||
encodedText.charCodeAt(pos) === CharacterCodes.comma ||
encodedText.charCodeAt(pos) === CharacterCodes.semicolon);
}
}
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