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Diffstat (limited to 'node_modules/@jridgewell/trace-mapping/dist/trace-mapping.mjs')
-rw-r--r-- | node_modules/@jridgewell/trace-mapping/dist/trace-mapping.mjs | 269 |
1 files changed, 269 insertions, 0 deletions
diff --git a/node_modules/@jridgewell/trace-mapping/dist/trace-mapping.mjs b/node_modules/@jridgewell/trace-mapping/dist/trace-mapping.mjs new file mode 100644 index 0000000..fd59d76 --- /dev/null +++ b/node_modules/@jridgewell/trace-mapping/dist/trace-mapping.mjs @@ -0,0 +1,269 @@ +import { decode, encode } from '@jridgewell/sourcemap-codec'; +import resolveUri from '@jridgewell/resolve-uri'; + +function resolve(input, base) { + // The base is always treated as a directory, if it's not empty. + // https://github.com/mozilla/source-map/blob/8cb3ee57/lib/util.js#L327 + // https://github.com/chromium/chromium/blob/da4adbb3/third_party/blink/renderer/devtools/front_end/sdk/SourceMap.js#L400-L401 + if (base && !base.endsWith('/')) + base += '/'; + return resolveUri(input, base); +} + +/** + * Removes everything after the last "/", but leaves the slash. + */ +function stripFilename(path) { + if (!path) + return ''; + const index = path.lastIndexOf('/'); + return path.slice(0, index + 1); +} + +function maybeSort(mappings, owned) { + const unsortedIndex = nextUnsortedSegmentLine(mappings, 0); + if (unsortedIndex === mappings.length) + return mappings; + // If we own the array (meaning we parsed it from JSON), then we're free to directly mutate it. If + // not, we do not want to modify the consumer's input array. + if (!owned) + mappings = mappings.slice(); + for (let i = unsortedIndex; i < mappings.length; i = nextUnsortedSegmentLine(mappings, i + 1)) { + mappings[i] = sortSegments(mappings[i], owned); + } + return mappings; +} +function nextUnsortedSegmentLine(mappings, start) { + for (let i = start; i < mappings.length; i++) { + if (!isSorted(mappings[i])) + return i; + } + return mappings.length; +} +function isSorted(line) { + for (let j = 1; j < line.length; j++) { + if (line[j][0] < line[j - 1][0]) { + return false; + } + } + return true; +} +function sortSegments(line, owned) { + if (!owned) + line = line.slice(); + return line.sort(sortComparator); +} +function sortComparator(a, b) { + return a[0] - b[0]; +} + +/** + * A binary search implementation that returns the index if a match is found. + * If no match is found, then the left-index (the index associated with the item that comes just + * before the desired index) is returned. To maintain proper sort order, a splice would happen at + * the next index: + * + * ```js + * const array = [1, 3]; + * const needle = 2; + * const index = binarySearch(array, needle, (item, needle) => item - needle); + * + * assert.equal(index, 0); + * array.splice(index + 1, 0, needle); + * assert.deepEqual(array, [1, 2, 3]); + * ``` + */ +function binarySearch(haystack, needle, low, high) { + while (low <= high) { + const mid = low + ((high - low) >> 1); + const cmp = haystack[mid][0] - needle; + if (cmp === 0) { + return mid; + } + if (cmp < 0) { + low = mid + 1; + } + else { + high = mid - 1; + } + } + return low - 1; +} +function memoizedState() { + return { + lastKey: -1, + lastNeedle: -1, + lastIndex: -1, + }; +} +/** + * This overly complicated beast is just to record the last tested line/column and the resulting + * index, allowing us to skip a few tests if mappings are monotonically increasing. + */ +function memoizedBinarySearch(haystack, needle, state, key) { + const { lastKey, lastNeedle, lastIndex } = state; + let low = 0; + let high = haystack.length - 1; + if (key === lastKey) { + if (needle === lastNeedle) { + return lastIndex; + } + if (needle >= lastNeedle) { + // lastIndex may be -1 if the previous needle was not found. + low = Math.max(lastIndex, 0); + } + else { + high = lastIndex; + } + } + state.lastKey = key; + state.lastNeedle = needle; + return (state.lastIndex = binarySearch(haystack, needle, low, high)); +} + +const INVALID_MAPPING = Object.freeze({ + source: null, + line: null, + column: null, + name: null, +}); +/** + * Returns the encoded (VLQ string) form of the SourceMap's mappings field. + */ +let encodedMappings; +/** + * Returns the decoded (array of lines of segments) form of the SourceMap's mappings field. + */ +let decodedMappings; +/** + * A low-level API to find the segment associated with a generated line/column (think, from a + * stack trace). Line and column here are 0-based, unlike `originalPositionFor`. + */ +let traceSegment; +/** + * A higher-level API to find the source/line/column associated with a generated line/column + * (think, from a stack trace). Line is 1-based, but column is 0-based, due to legacy behavior in + * `source-map` library. + */ +let originalPositionFor; +/** + * Iterates each mapping in generated position order. + */ +let eachMapping; +/** + * A helper that skips sorting of the input map's mappings array, which can be expensive for larger + * maps. + */ +let presortedDecodedMap; +class TraceMap { + constructor(map, mapUrl) { + this._binarySearchMemo = memoizedState(); + const isString = typeof map === 'string'; + const parsed = isString ? JSON.parse(map) : map; + const { version, file, names, sourceRoot, sources, sourcesContent } = parsed; + this.version = version; + this.file = file; + this.names = names; + this.sourceRoot = sourceRoot; + this.sources = sources; + this.sourcesContent = sourcesContent; + if (sourceRoot || mapUrl) { + const from = resolve(sourceRoot || '', stripFilename(mapUrl)); + this.resolvedSources = sources.map((s) => resolve(s || '', from)); + } + else { + this.resolvedSources = sources.map((s) => s || ''); + } + const { mappings } = parsed; + if (typeof mappings === 'string') { + this._encoded = mappings; + this._decoded = decode(mappings); + } + else { + this._encoded = undefined; + this._decoded = maybeSort(mappings, isString); + } + } +} +(() => { + encodedMappings = (map) => { + var _a; + return ((_a = map._encoded) !== null && _a !== void 0 ? _a : (map._encoded = encode(map._decoded))); + }; + decodedMappings = (map) => { + return map._decoded; + }; + traceSegment = (map, line, column) => { + const decoded = map._decoded; + // It's common for parent source maps to have pointers to lines that have no + // mapping (like a "//# sourceMappingURL=") at the end of the child file. + if (line >= decoded.length) + return null; + const segments = decoded[line]; + const index = memoizedBinarySearch(segments, column, map._binarySearchMemo, line); + // we come before any mapped segment + if (index < 0) + return null; + return segments[index]; + }; + originalPositionFor = (map, { line, column }) => { + if (line < 1) + throw new Error('`line` must be greater than 0 (lines start at line 1)'); + if (column < 0) { + throw new Error('`column` must be greater than or equal to 0 (columns start at column 0)'); + } + const segment = traceSegment(map, line - 1, column); + if (segment == null) + return INVALID_MAPPING; + if (segment.length == 1) + return INVALID_MAPPING; + const { names, resolvedSources } = map; + return { + source: resolvedSources[segment[1]], + line: segment[2] + 1, + column: segment[3], + name: segment.length === 5 ? names[segment[4]] : null, + }; + }; + eachMapping = (map, cb) => { + const decoded = map._decoded; + const { names, resolvedSources } = map; + for (let i = 0; i < decoded.length; i++) { + const line = decoded[i]; + for (let j = 0; j < line.length; j++) { + const seg = line[j]; + const generatedLine = i + 1; + const generatedColumn = seg[0]; + let source = null; + let originalLine = null; + let originalColumn = null; + let name = null; + if (seg.length !== 1) { + source = resolvedSources[seg[1]]; + originalLine = seg[2] + 1; + originalColumn = seg[3]; + } + if (seg.length === 5) + name = names[seg[4]]; + cb({ + generatedLine, + generatedColumn, + source, + originalLine, + originalColumn, + name, + }); + } + } + }; + presortedDecodedMap = (map, mapUrl) => { + const clone = Object.assign({}, map); + clone.mappings = []; + const tracer = new TraceMap(clone, mapUrl); + tracer._decoded = map.mappings; + return tracer; + }; +})(); + +export { TraceMap, decodedMappings, eachMapping, encodedMappings, originalPositionFor, presortedDecodedMap, traceSegment }; +//# sourceMappingURL=trace-mapping.mjs.map |