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270 lines
8.7 KiB
270 lines
8.7 KiB
3 years ago
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import { decode, encode } from '@jridgewell/sourcemap-codec';
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import resolveUri from '@jridgewell/resolve-uri';
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function resolve(input, base) {
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// The base is always treated as a directory, if it's not empty.
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// https://github.com/mozilla/source-map/blob/8cb3ee57/lib/util.js#L327
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// https://github.com/chromium/chromium/blob/da4adbb3/third_party/blink/renderer/devtools/front_end/sdk/SourceMap.js#L400-L401
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if (base && !base.endsWith('/'))
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base += '/';
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return resolveUri(input, base);
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}
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/**
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* Removes everything after the last "/", but leaves the slash.
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*/
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function stripFilename(path) {
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if (!path)
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return '';
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const index = path.lastIndexOf('/');
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return path.slice(0, index + 1);
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}
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function maybeSort(mappings, owned) {
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const unsortedIndex = nextUnsortedSegmentLine(mappings, 0);
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if (unsortedIndex === mappings.length)
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return mappings;
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// If we own the array (meaning we parsed it from JSON), then we're free to directly mutate it. If
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// not, we do not want to modify the consumer's input array.
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if (!owned)
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mappings = mappings.slice();
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for (let i = unsortedIndex; i < mappings.length; i = nextUnsortedSegmentLine(mappings, i + 1)) {
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mappings[i] = sortSegments(mappings[i], owned);
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}
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return mappings;
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}
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function nextUnsortedSegmentLine(mappings, start) {
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for (let i = start; i < mappings.length; i++) {
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if (!isSorted(mappings[i]))
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return i;
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}
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return mappings.length;
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}
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function isSorted(line) {
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for (let j = 1; j < line.length; j++) {
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if (line[j][0] < line[j - 1][0]) {
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return false;
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}
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}
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return true;
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}
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function sortSegments(line, owned) {
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if (!owned)
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line = line.slice();
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return line.sort(sortComparator);
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}
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function sortComparator(a, b) {
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return a[0] - b[0];
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}
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/**
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* A binary search implementation that returns the index if a match is found.
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* If no match is found, then the left-index (the index associated with the item that comes just
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* before the desired index) is returned. To maintain proper sort order, a splice would happen at
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* the next index:
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*
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* ```js
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* const array = [1, 3];
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* const needle = 2;
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* const index = binarySearch(array, needle, (item, needle) => item - needle);
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*
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* assert.equal(index, 0);
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* array.splice(index + 1, 0, needle);
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* assert.deepEqual(array, [1, 2, 3]);
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* ```
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*/
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function binarySearch(haystack, needle, low, high) {
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while (low <= high) {
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const mid = low + ((high - low) >> 1);
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const cmp = haystack[mid][0] - needle;
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if (cmp === 0) {
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return mid;
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}
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if (cmp < 0) {
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low = mid + 1;
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}
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else {
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high = mid - 1;
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}
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}
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return low - 1;
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}
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function memoizedState() {
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return {
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lastKey: -1,
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lastNeedle: -1,
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lastIndex: -1,
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};
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}
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/**
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* This overly complicated beast is just to record the last tested line/column and the resulting
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* index, allowing us to skip a few tests if mappings are monotonically increasing.
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*/
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function memoizedBinarySearch(haystack, needle, state, key) {
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const { lastKey, lastNeedle, lastIndex } = state;
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let low = 0;
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let high = haystack.length - 1;
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if (key === lastKey) {
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if (needle === lastNeedle) {
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return lastIndex;
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}
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if (needle >= lastNeedle) {
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// lastIndex may be -1 if the previous needle was not found.
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low = Math.max(lastIndex, 0);
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}
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else {
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high = lastIndex;
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}
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}
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state.lastKey = key;
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state.lastNeedle = needle;
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return (state.lastIndex = binarySearch(haystack, needle, low, high));
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}
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const INVALID_MAPPING = Object.freeze({
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source: null,
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line: null,
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column: null,
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name: null,
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});
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/**
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* Returns the encoded (VLQ string) form of the SourceMap's mappings field.
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*/
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let encodedMappings;
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/**
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* Returns the decoded (array of lines of segments) form of the SourceMap's mappings field.
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*/
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let decodedMappings;
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/**
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* A low-level API to find the segment associated with a generated line/column (think, from a
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* stack trace). Line and column here are 0-based, unlike `originalPositionFor`.
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*/
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let traceSegment;
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/**
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* A higher-level API to find the source/line/column associated with a generated line/column
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* (think, from a stack trace). Line is 1-based, but column is 0-based, due to legacy behavior in
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* `source-map` library.
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*/
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let originalPositionFor;
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/**
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* Iterates each mapping in generated position order.
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*/
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let eachMapping;
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/**
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* A helper that skips sorting of the input map's mappings array, which can be expensive for larger
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* maps.
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*/
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let presortedDecodedMap;
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class TraceMap {
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constructor(map, mapUrl) {
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this._binarySearchMemo = memoizedState();
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const isString = typeof map === 'string';
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const parsed = isString ? JSON.parse(map) : map;
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const { version, file, names, sourceRoot, sources, sourcesContent } = parsed;
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this.version = version;
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this.file = file;
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this.names = names;
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this.sourceRoot = sourceRoot;
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this.sources = sources;
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this.sourcesContent = sourcesContent;
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if (sourceRoot || mapUrl) {
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const from = resolve(sourceRoot || '', stripFilename(mapUrl));
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this.resolvedSources = sources.map((s) => resolve(s || '', from));
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}
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else {
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this.resolvedSources = sources.map((s) => s || '');
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}
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const { mappings } = parsed;
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if (typeof mappings === 'string') {
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this._encoded = mappings;
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this._decoded = decode(mappings);
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}
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else {
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this._encoded = undefined;
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this._decoded = maybeSort(mappings, isString);
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}
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}
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}
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(() => {
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encodedMappings = (map) => {
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var _a;
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return ((_a = map._encoded) !== null && _a !== void 0 ? _a : (map._encoded = encode(map._decoded)));
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};
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decodedMappings = (map) => {
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return map._decoded;
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};
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traceSegment = (map, line, column) => {
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const decoded = map._decoded;
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// It's common for parent source maps to have pointers to lines that have no
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// mapping (like a "//# sourceMappingURL=") at the end of the child file.
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if (line >= decoded.length)
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return null;
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const segments = decoded[line];
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const index = memoizedBinarySearch(segments, column, map._binarySearchMemo, line);
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// we come before any mapped segment
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if (index < 0)
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return null;
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return segments[index];
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};
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originalPositionFor = (map, { line, column }) => {
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if (line < 1)
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throw new Error('`line` must be greater than 0 (lines start at line 1)');
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if (column < 0) {
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throw new Error('`column` must be greater than or equal to 0 (columns start at column 0)');
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}
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const segment = traceSegment(map, line - 1, column);
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if (segment == null)
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return INVALID_MAPPING;
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if (segment.length == 1)
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return INVALID_MAPPING;
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const { names, resolvedSources } = map;
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return {
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source: resolvedSources[segment[1]],
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line: segment[2] + 1,
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column: segment[3],
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name: segment.length === 5 ? names[segment[4]] : null,
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};
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};
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eachMapping = (map, cb) => {
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const decoded = map._decoded;
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const { names, resolvedSources } = map;
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for (let i = 0; i < decoded.length; i++) {
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const line = decoded[i];
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for (let j = 0; j < line.length; j++) {
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const seg = line[j];
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const generatedLine = i + 1;
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const generatedColumn = seg[0];
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let source = null;
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let originalLine = null;
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let originalColumn = null;
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let name = null;
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if (seg.length !== 1) {
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source = resolvedSources[seg[1]];
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originalLine = seg[2] + 1;
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originalColumn = seg[3];
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}
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if (seg.length === 5)
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name = names[seg[4]];
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cb({
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generatedLine,
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generatedColumn,
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source,
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originalLine,
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originalColumn,
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name,
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});
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}
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}
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};
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presortedDecodedMap = (map, mapUrl) => {
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const clone = Object.assign({}, map);
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clone.mappings = [];
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const tracer = new TraceMap(clone, mapUrl);
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tracer._decoded = map.mappings;
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return tracer;
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};
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})();
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export { TraceMap, decodedMappings, eachMapping, encodedMappings, originalPositionFor, presortedDecodedMap, traceSegment };
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//# sourceMappingURL=trace-mapping.mjs.map
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