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import { decode as decode_mappings } from '@jridgewell/sourcemap-codec';
/**
* Import decoded sourcemap from mozilla/source-map/SourceMapGenerator
* Forked from source-map/lib/source-map-generator.js
* from methods _serializeMappings and toJSON.
* We cannot use source-map.d.ts types, because we access hidden properties.
* @param {any} generator
*/
function decoded_sourcemap_from_generator(generator) {
let previous_generated_line = 1;
/** @type {number[][][]} */
const converted_mappings = [[]];
let result_line = converted_mappings[0];
let result_segment;
let mapping;
const source_idx = generator._sources
.toArray()
// @ts-ignore
.reduce((acc, val, idx) => ((acc[val] = idx), acc), {});
const name_idx = generator._names
.toArray()
// @ts-ignore
.reduce((acc, val, idx) => ((acc[val] = idx), acc), {});
const mappings = generator._mappings.toArray();
for (let i = 0, len = mappings.length; i < len; i++) {
mapping = mappings[i];
if (mapping.generatedLine > previous_generated_line) {
while (mapping.generatedLine > previous_generated_line) {
converted_mappings.push([]);
previous_generated_line++;
}
result_line = converted_mappings[mapping.generatedLine - 1]; // line is one-based
} else if (i > 0) {
const previous_mapping = mappings[i - 1];
if (
// sorted by selectivity
mapping.generatedColumn === previous_mapping.generatedColumn &&
mapping.originalColumn === previous_mapping.originalColumn &&
mapping.name === previous_mapping.name &&
mapping.generatedLine === previous_mapping.generatedLine &&
mapping.originalLine === previous_mapping.originalLine &&
mapping.source === previous_mapping.source
) {
continue;
}
}
result_line.push([mapping.generatedColumn]);
result_segment = result_line[result_line.length - 1];
if (mapping.source != null) {
result_segment.push(
...[source_idx[mapping.source], mapping.originalLine - 1, mapping.originalColumn]
);
if (mapping.name != null) {
result_segment.push(name_idx[mapping.name]);
}
}
}
/**
* @type {{
* version: number;
* sources: string[];
* names: string[];
* mappings: number[][][];
* file?: string;
* }}
*/
const map = {
version: generator._version,
sources: generator._sources.toArray(),
names: generator._names.toArray(),
mappings: converted_mappings
};
if (generator._file != null) {
map.file = generator._file;
}
// not needed: map.sourcesContent and map.sourceRoot
return map;
}
/**
* @param {Processed} processed
*/
export function decode_map(processed) {
let decoded_map = typeof processed.map === 'string' ? JSON.parse(processed.map) : processed.map;
if (typeof decoded_map.mappings === 'string') {
decoded_map.mappings = decode_mappings(decoded_map.mappings);
}
if (decoded_map._mappings && decoded_map.constructor.name === 'SourceMapGenerator') {
// import decoded sourcemap from mozilla/source-map/SourceMapGenerator
decoded_map = decoded_sourcemap_from_generator(decoded_map);
}
return decoded_map;
}
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