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Diffstat (limited to 'node_modules/@ampproject/remapping/dist/remapping.mjs')
| -rw-r--r-- | node_modules/@ampproject/remapping/dist/remapping.mjs | 191 |
1 files changed, 191 insertions, 0 deletions
diff --git a/node_modules/@ampproject/remapping/dist/remapping.mjs b/node_modules/@ampproject/remapping/dist/remapping.mjs new file mode 100644 index 00000000..b5eddeda --- /dev/null +++ b/node_modules/@ampproject/remapping/dist/remapping.mjs @@ -0,0 +1,191 @@ +import { decodedMappings, traceSegment, TraceMap } from '@jridgewell/trace-mapping'; +import { GenMapping, maybeAddSegment, setSourceContent, toDecodedMap, toEncodedMap } from '@jridgewell/gen-mapping'; + +const SOURCELESS_MAPPING = /* #__PURE__ */ SegmentObject('', -1, -1, '', null); +const EMPTY_SOURCES = []; +function SegmentObject(source, line, column, name, content) { + return { source, line, column, name, content }; +} +function Source(map, sources, source, content) { + return { + map, + sources, + source, + content, + }; +} +/** + * MapSource represents a single sourcemap, with the ability to trace mappings into its child nodes + * (which may themselves be SourceMapTrees). + */ +function MapSource(map, sources) { + return Source(map, sources, '', null); +} +/** + * A "leaf" node in the sourcemap tree, representing an original, unmodified source file. Recursive + * segment tracing ends at the `OriginalSource`. + */ +function OriginalSource(source, content) { + return Source(null, EMPTY_SOURCES, source, content); +} +/** + * traceMappings is only called on the root level SourceMapTree, and begins the process of + * resolving each mapping in terms of the original source files. + */ +function traceMappings(tree) { + // TODO: Eventually support sourceRoot, which has to be removed because the sources are already + // fully resolved. We'll need to make sources relative to the sourceRoot before adding them. + const gen = new GenMapping({ file: tree.map.file }); + const { sources: rootSources, map } = tree; + const rootNames = map.names; + const rootMappings = decodedMappings(map); + for (let i = 0; i < rootMappings.length; i++) { + const segments = rootMappings[i]; + for (let j = 0; j < segments.length; j++) { + const segment = segments[j]; + const genCol = segment[0]; + let traced = SOURCELESS_MAPPING; + // 1-length segments only move the current generated column, there's no source information + // to gather from it. + if (segment.length !== 1) { + const source = rootSources[segment[1]]; + traced = originalPositionFor(source, segment[2], segment[3], segment.length === 5 ? rootNames[segment[4]] : ''); + // If the trace is invalid, then the trace ran into a sourcemap that doesn't contain a + // respective segment into an original source. + if (traced == null) + continue; + } + const { column, line, name, content, source } = traced; + maybeAddSegment(gen, i, genCol, source, line, column, name); + if (source && content != null) + setSourceContent(gen, source, content); + } + } + return gen; +} +/** + * originalPositionFor is only called on children SourceMapTrees. It recurses down into its own + * child SourceMapTrees, until we find the original source map. + */ +function originalPositionFor(source, line, column, name) { + if (!source.map) { + return SegmentObject(source.source, line, column, name, source.content); + } + const segment = traceSegment(source.map, line, column); + // If we couldn't find a segment, then this doesn't exist in the sourcemap. + if (segment == null) + return null; + // 1-length segments only move the current generated column, there's no source information + // to gather from it. + if (segment.length === 1) + return SOURCELESS_MAPPING; + return originalPositionFor(source.sources[segment[1]], segment[2], segment[3], segment.length === 5 ? source.map.names[segment[4]] : name); +} + +function asArray(value) { + if (Array.isArray(value)) + return value; + return [value]; +} +/** + * Recursively builds a tree structure out of sourcemap files, with each node + * being either an `OriginalSource` "leaf" or a `SourceMapTree` composed of + * `OriginalSource`s and `SourceMapTree`s. + * + * Every sourcemap is composed of a collection of source files and mappings + * into locations of those source files. When we generate a `SourceMapTree` for + * the sourcemap, we attempt to load each source file's own sourcemap. If it + * does not have an associated sourcemap, it is considered an original, + * unmodified source file. + */ +function buildSourceMapTree(input, loader) { + const maps = asArray(input).map((m) => new TraceMap(m, '')); + const map = maps.pop(); + for (let i = 0; i < maps.length; i++) { + if (maps[i].sources.length > 1) { + throw new Error(`Transformation map ${i} must have exactly one source file.\n` + + 'Did you specify these with the most recent transformation maps first?'); + } + } + let tree = build(map, loader, '', 0); + for (let i = maps.length - 1; i >= 0; i--) { + tree = MapSource(maps[i], [tree]); + } + return tree; +} +function build(map, loader, importer, importerDepth) { + const { resolvedSources, sourcesContent } = map; + const depth = importerDepth + 1; + const children = resolvedSources.map((sourceFile, i) => { + // The loading context gives the loader more information about why this file is being loaded + // (eg, from which importer). It also allows the loader to override the location of the loaded + // sourcemap/original source, or to override the content in the sourcesContent field if it's + // an unmodified source file. + const ctx = { + importer, + depth, + source: sourceFile || '', + content: undefined, + }; + // Use the provided loader callback to retrieve the file's sourcemap. + // TODO: We should eventually support async loading of sourcemap files. + const sourceMap = loader(ctx.source, ctx); + const { source, content } = ctx; + // If there is a sourcemap, then we need to recurse into it to load its source files. + if (sourceMap) + return build(new TraceMap(sourceMap, source), loader, source, depth); + // Else, it's an an unmodified source file. + // The contents of this unmodified source file can be overridden via the loader context, + // allowing it to be explicitly null or a string. If it remains undefined, we fall back to + // the importing sourcemap's `sourcesContent` field. + const sourceContent = content !== undefined ? content : sourcesContent ? sourcesContent[i] : null; + return OriginalSource(source, sourceContent); + }); + return MapSource(map, children); +} + +/** + * A SourceMap v3 compatible sourcemap, which only includes fields that were + * provided to it. + */ +class SourceMap { + constructor(map, options) { + const out = options.decodedMappings ? toDecodedMap(map) : toEncodedMap(map); + this.version = out.version; // SourceMap spec says this should be first. + this.file = out.file; + this.mappings = out.mappings; + this.names = out.names; + this.sourceRoot = out.sourceRoot; + this.sources = out.sources; + if (!options.excludeContent) { + this.sourcesContent = out.sourcesContent; + } + } + toString() { + return JSON.stringify(this); + } +} + +/** + * Traces through all the mappings in the root sourcemap, through the sources + * (and their sourcemaps), all the way back to the original source location. + * + * `loader` will be called every time we encounter a source file. If it returns + * a sourcemap, we will recurse into that sourcemap to continue the trace. If + * it returns a falsey value, that source file is treated as an original, + * unmodified source file. + * + * Pass `excludeContent` to exclude any self-containing source file content + * from the output sourcemap. + * + * Pass `decodedMappings` to receive a SourceMap with decoded (instead of + * VLQ encoded) mappings. + */ +function remapping(input, loader, options) { + const opts = typeof options === 'object' ? options : { excludeContent: !!options, decodedMappings: false }; + const tree = buildSourceMapTree(input, loader); + return new SourceMap(traceMappings(tree), opts); +} + +export { remapping as default }; +//# sourceMappingURL=remapping.mjs.map |
