Spaces:
Running
Running
File size: 9,328 Bytes
1df763a |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 |
(function (global, factory) {
typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('@jridgewell/trace-mapping'), require('@jridgewell/gen-mapping')) :
typeof define === 'function' && define.amd ? define(['@jridgewell/trace-mapping', '@jridgewell/gen-mapping'], factory) :
(global = typeof globalThis !== 'undefined' ? globalThis : global || self, global.remapping = factory(global.traceMapping, global.genMapping));
})(this, (function (traceMapping, genMapping) { 'use strict';
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.GenMapping({ file: tree.map.file });
const { sources: rootSources, map } = tree;
const rootNames = map.names;
const rootMappings = traceMapping.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;
genMapping.maybeAddSegment(gen, i, genCol, source, line, column, name);
if (source && content != null)
genMapping.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 = traceMapping.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 traceMapping.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 traceMapping.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 ? genMapping.toDecodedMap(map) : genMapping.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);
}
return remapping;
}));
//# sourceMappingURL=remapping.umd.js.map
|