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17 KiB
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17 KiB
2 months ago
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{"version":3,"file":"remapping.mjs","sources":["../src/source-map-tree.ts","../src/build-source-map-tree.ts","../src/source-map.ts","../src/remapping.ts"],"sourcesContent":["import { GenMapping, maybeAddSegment, setIgnore, setSourceContent } from '@jridgewell/gen-mapping';\nimport { traceSegment, decodedMappings } from '@jridgewell/trace-mapping';\n\nimport type { TraceMap } from '@jridgewell/trace-mapping';\n\nexport type SourceMapSegmentObject = {\n column: number;\n line: number;\n name: string;\n source: string;\n content: string | null;\n ignore: boolean;\n};\n\nexport type OriginalSource = {\n map: null;\n sources: Sources[];\n source: string;\n content: string | null;\n ignore: boolean;\n};\n\nexport type MapSource = {\n map: TraceMap;\n sources: Sources[];\n source: string;\n content: null;\n ignore: false;\n};\n\nexport type Sources = OriginalSource | MapSource;\n\nconst SOURCELESS_MAPPING = /* #__PURE__ */ SegmentObject('', -1, -1, '', null, false);\nconst EMPTY_SOURCES: Sources[] = [];\n\nfunction SegmentObject(\n source: string,\n line: number,\n column: number,\n name: string,\n content: string | null,\n ignore: boolean\n): SourceMapSegmentObject {\n return { source, line, column, name, content, ignore };\n}\n\nfunction Source(\n map: TraceMap,\n sources: Sources[],\n source: '',\n content: null,\n ignore: false\n): MapSource;\nfunction Source(\n map: null,\n sources: Sources[],\n source: string,\n content: string | null,\n ignore: boolean\n): OriginalSource;\nfunction Source(\n map: TraceMap | null,\n sources: Sources[],\n source: string | '',\n content: string | null,\n ignore: boolean\n): Sources {\n return {\n map,\n sources,\n source,\n content,\n ignore,\n } as any;\n}\n\n/**\n * MapSource represents a single sourcemap, with the ability to trace mappings into its child nodes\n * (which may themselves be SourceMapTrees).\n */\nexport function MapSource(map: TraceMap, sources: Sources[]): MapSource {\n return Source(map, sources, '', null, false);\n}\n\n/**\n * A \"leaf\" node in the sourcemap tree, representing an original, unmodified source file. Recursive\n * segment tracing ends at the `OriginalSource`.\n */\nexport function OriginalSource(\n source: string,\n content: string | null,\n ignore: boolean\n): OriginalSource {\n return Source(null, EMPTY_SOURCES, source, content, ignore);\n}\n\n/**\n * traceMappings is only called on the root level SourceMapTree, and begins the process of\n * resolving each mapping in terms of the original source files.\n */\nexport function traceMappings(tree: MapSource): GenMapping {\n // TODO: Eventually support sourceRoot, which has to be removed because the sources are already\n // fully resolved. We'll need to make sources relative to the sourceRoot before adding them.\n const gen = new GenMapping({ file: tree.map.file });\n const { sources: rootSources, map } = tree;\n const rootNames = map.names;\n const rootMappings = decodedMappings(map);\n\n for (let i = 0; i < rootMappings.length; i++) {\n const segments = rootMappings[i];\n\n for (let j = 0; j < segments.length; j++) {\n const segment = segments[j];\n const genCol = segment[0];\n let traced: SourceMapSegmentObject | null = SOURCELESS_MAPPING;\n\n // 1-length segments only move the current generated column, there's no source information\n // to gather from it.\n if (segment.length !== 1) {\n const source = rootSources[segment[1]];\n traced = originalPositionFor(\n source,\n segment[2],\n segment[3],\n segment.length === 5 ? rootNames[segment[4]] : ''\n );\n\n // If the trace is invalid, then the trace ran into a sourcemap that doesn't contain a\n // respective segment into an original source.\n if (traced == null) continue;\n }\n\n const { column, line, name, content, source, ignore } = traced;\n\n maybeAddSegment(gen, i, genCol, source, line, column, name);\n if (source && content != null) setSourceContent(gen,
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