231 lines
9 KiB
JavaScript
231 lines
9 KiB
JavaScript
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import { SetArray, put } from '@jridgewell/set-array';
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import { encode } from '@jridgewell/sourcemap-codec';
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import { TraceMap, decodedMappings } from '@jridgewell/trace-mapping';
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const COLUMN = 0;
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const SOURCES_INDEX = 1;
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const SOURCE_LINE = 2;
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const SOURCE_COLUMN = 3;
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const NAMES_INDEX = 4;
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const NO_NAME = -1;
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/**
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* A low-level API to associate a generated position with an original source position. Line and
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* column here are 0-based, unlike `addMapping`.
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*/
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let addSegment;
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/**
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* A high-level API to associate a generated position with an original source position. Line is
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* 1-based, but column is 0-based, due to legacy behavior in `source-map` library.
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*/
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let addMapping;
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/**
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* Same as `addSegment`, but will only add the segment if it generates useful information in the
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* resulting map. This only works correctly if segments are added **in order**, meaning you should
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* not add a segment with a lower generated line/column than one that came before.
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*/
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let maybeAddSegment;
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/**
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* Same as `addMapping`, but will only add the mapping if it generates useful information in the
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* resulting map. This only works correctly if mappings are added **in order**, meaning you should
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* not add a mapping with a lower generated line/column than one that came before.
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*/
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let maybeAddMapping;
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/**
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* Adds/removes the content of the source file to the source map.
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*/
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let setSourceContent;
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/**
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* Returns a sourcemap object (with decoded mappings) suitable for passing to a library that expects
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* a sourcemap, or to JSON.stringify.
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*/
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let toDecodedMap;
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/**
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* Returns a sourcemap object (with encoded mappings) suitable for passing to a library that expects
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* a sourcemap, or to JSON.stringify.
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*/
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let toEncodedMap;
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/**
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* Constructs a new GenMapping, using the already present mappings of the input.
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*/
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let fromMap;
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/**
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* Returns an array of high-level mapping objects for every recorded segment, which could then be
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* passed to the `source-map` library.
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*/
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let allMappings;
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// This split declaration is only so that terser can elminiate the static initialization block.
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let addSegmentInternal;
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/**
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* Provides the state to generate a sourcemap.
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*/
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class GenMapping {
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constructor({ file, sourceRoot } = {}) {
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this._names = new SetArray();
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this._sources = new SetArray();
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this._sourcesContent = [];
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this._mappings = [];
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this.file = file;
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this.sourceRoot = sourceRoot;
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}
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}
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(() => {
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addSegment = (map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
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return addSegmentInternal(false, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content);
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};
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maybeAddSegment = (map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
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return addSegmentInternal(true, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content);
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};
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addMapping = (map, mapping) => {
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return addMappingInternal(false, map, mapping);
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};
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maybeAddMapping = (map, mapping) => {
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return addMappingInternal(true, map, mapping);
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};
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setSourceContent = (map, source, content) => {
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const { _sources: sources, _sourcesContent: sourcesContent } = map;
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sourcesContent[put(sources, source)] = content;
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};
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toDecodedMap = (map) => {
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const { file, sourceRoot, _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
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removeEmptyFinalLines(mappings);
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return {
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version: 3,
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file: file || undefined,
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names: names.array,
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sourceRoot: sourceRoot || undefined,
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sources: sources.array,
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sourcesContent,
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mappings,
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};
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};
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toEncodedMap = (map) => {
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const decoded = toDecodedMap(map);
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return Object.assign(Object.assign({}, decoded), { mappings: encode(decoded.mappings) });
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};
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allMappings = (map) => {
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const out = [];
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const { _mappings: mappings, _sources: sources, _names: names } = map;
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for (let i = 0; i < mappings.length; i++) {
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const line = mappings[i];
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for (let j = 0; j < line.length; j++) {
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const seg = line[j];
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const generated = { line: i + 1, column: seg[COLUMN] };
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let source = undefined;
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let original = undefined;
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let name = undefined;
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if (seg.length !== 1) {
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source = sources.array[seg[SOURCES_INDEX]];
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original = { line: seg[SOURCE_LINE] + 1, column: seg[SOURCE_COLUMN] };
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if (seg.length === 5)
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name = names.array[seg[NAMES_INDEX]];
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}
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out.push({ generated, source, original, name });
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}
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}
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return out;
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};
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fromMap = (input) => {
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const map = new TraceMap(input);
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const gen = new GenMapping({ file: map.file, sourceRoot: map.sourceRoot });
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putAll(gen._names, map.names);
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putAll(gen._sources, map.sources);
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gen._sourcesContent = map.sourcesContent || map.sources.map(() => null);
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gen._mappings = decodedMappings(map);
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return gen;
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};
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// Internal helpers
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addSegmentInternal = (skipable, map, genLine, genColumn, source, sourceLine, sourceColumn, name, content) => {
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const { _mappings: mappings, _sources: sources, _sourcesContent: sourcesContent, _names: names, } = map;
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const line = getLine(mappings, genLine);
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const index = getColumnIndex(line, genColumn);
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if (!source) {
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if (skipable && skipSourceless(line, index))
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return;
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return insert(line, index, [genColumn]);
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}
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const sourcesIndex = put(sources, source);
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const namesIndex = name ? put(names, name) : NO_NAME;
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if (sourcesIndex === sourcesContent.length)
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sourcesContent[sourcesIndex] = content !== null && content !== void 0 ? content : null;
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if (skipable && skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex)) {
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return;
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}
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return insert(line, index, name
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? [genColumn, sourcesIndex, sourceLine, sourceColumn, namesIndex]
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: [genColumn, sourcesIndex, sourceLine, sourceColumn]);
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};
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})();
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function getLine(mappings, index) {
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for (let i = mappings.length; i <= index; i++) {
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mappings[i] = [];
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}
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return mappings[index];
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}
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function getColumnIndex(line, genColumn) {
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let index = line.length;
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for (let i = index - 1; i >= 0; index = i--) {
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const current = line[i];
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if (genColumn >= current[COLUMN])
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break;
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}
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return index;
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}
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function insert(array, index, value) {
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for (let i = array.length; i > index; i--) {
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array[i] = array[i - 1];
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}
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array[index] = value;
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}
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function removeEmptyFinalLines(mappings) {
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const { length } = mappings;
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let len = length;
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for (let i = len - 1; i >= 0; len = i, i--) {
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if (mappings[i].length > 0)
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break;
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}
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if (len < length)
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mappings.length = len;
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}
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function putAll(strarr, array) {
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for (let i = 0; i < array.length; i++)
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put(strarr, array[i]);
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}
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function skipSourceless(line, index) {
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// The start of a line is already sourceless, so adding a sourceless segment to the beginning
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// doesn't generate any useful information.
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if (index === 0)
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return true;
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const prev = line[index - 1];
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// If the previous segment is also sourceless, then adding another sourceless segment doesn't
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// genrate any new information. Else, this segment will end the source/named segment and point to
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// a sourceless position, which is useful.
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return prev.length === 1;
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}
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function skipSource(line, index, sourcesIndex, sourceLine, sourceColumn, namesIndex) {
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// A source/named segment at the start of a line gives position at that genColumn
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if (index === 0)
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return false;
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const prev = line[index - 1];
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// If the previous segment is sourceless, then we're transitioning to a source.
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if (prev.length === 1)
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return false;
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// If the previous segment maps to the exact same source position, then this segment doesn't
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// provide any new position information.
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return (sourcesIndex === prev[SOURCES_INDEX] &&
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sourceLine === prev[SOURCE_LINE] &&
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sourceColumn === prev[SOURCE_COLUMN] &&
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namesIndex === (prev.length === 5 ? prev[NAMES_INDEX] : NO_NAME));
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}
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function addMappingInternal(skipable, map, mapping) {
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const { generated, source, original, name, content } = mapping;
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if (!source) {
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return addSegmentInternal(skipable, map, generated.line - 1, generated.column, null, null, null, null, null);
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}
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const s = source;
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return addSegmentInternal(skipable, map, generated.line - 1, generated.column, s, original.line - 1, original.column, name, content);
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}
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export { GenMapping, addMapping, addSegment, allMappings, fromMap, maybeAddMapping, maybeAddSegment, setSourceContent, toDecodedMap, toEncodedMap };
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//# sourceMappingURL=gen-mapping.mjs.map
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