365 lines
10 KiB
JavaScript
365 lines
10 KiB
JavaScript
(function (global, factory) {
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typeof exports === 'object' && typeof module !== 'undefined' ?
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factory(
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exports,
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require('@jridgewell/set-array'),
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require('@jridgewell/sourcemap-codec'),
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require('@jridgewell/trace-mapping')
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)
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: typeof define === 'function' && define.amd ?
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define(
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[
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'exports',
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'@jridgewell/set-array',
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'@jridgewell/sourcemap-codec',
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'@jridgewell/trace-mapping',
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],
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factory
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)
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: ((global = typeof globalThis !== 'undefined' ? globalThis : global || self),
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factory(
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(global.genMapping = {}),
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global.setArray,
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global.sourcemapCodec,
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global.traceMapping
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));
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})(this, function (exports, setArray, sourcemapCodec, traceMapping) {
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'use strict';
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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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* 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.SetArray();
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this._sources = new setArray.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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this._ignoreList = new setArray.SetArray();
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}
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}
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/**
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* Typescript doesn't allow friend access to private fields, so this just casts the map into a type
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* with public access modifiers.
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*/
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function cast(map) {
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return map;
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}
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function addSegment(
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map,
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genLine,
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genColumn,
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source,
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sourceLine,
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sourceColumn,
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name,
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content
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) {
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return addSegmentInternal(
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false,
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map,
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genLine,
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genColumn,
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source,
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sourceLine,
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sourceColumn,
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name,
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content
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);
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}
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function addMapping(map, mapping) {
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return addMappingInternal(false, map, mapping);
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}
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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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const maybeAddSegment = (
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map,
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genLine,
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genColumn,
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source,
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sourceLine,
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sourceColumn,
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name,
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content
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) => {
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return addSegmentInternal(
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true,
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map,
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genLine,
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genColumn,
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source,
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sourceLine,
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sourceColumn,
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name,
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content
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);
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};
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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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const maybeAddMapping = (map, mapping) => {
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return addMappingInternal(true, map, mapping);
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};
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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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function setSourceContent(map, source, content) {
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const { _sources: sources, _sourcesContent: sourcesContent } = cast(map);
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const index = setArray.put(sources, source);
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sourcesContent[index] = content;
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}
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function setIgnore(map, source, ignore = true) {
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const {
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_sources: sources,
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_sourcesContent: sourcesContent,
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_ignoreList: ignoreList,
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} = cast(map);
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const index = setArray.put(sources, source);
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if (index === sourcesContent.length) sourcesContent[index] = null;
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if (ignore) setArray.put(ignoreList, index);
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else setArray.remove(ignoreList, index);
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}
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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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function toDecodedMap(map) {
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const {
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_mappings: mappings,
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_sources: sources,
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_sourcesContent: sourcesContent,
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_names: names,
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_ignoreList: ignoreList,
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} = cast(map);
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removeEmptyFinalLines(mappings);
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return {
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version: 3,
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file: map.file || undefined,
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names: names.array,
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sourceRoot: map.sourceRoot || undefined,
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sources: sources.array,
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sourcesContent,
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mappings,
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ignoreList: ignoreList.array,
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};
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}
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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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function toEncodedMap(map) {
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const decoded = toDecodedMap(map);
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return Object.assign(Object.assign({}, decoded), {
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mappings: sourcemapCodec.encode(decoded.mappings),
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});
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}
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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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function fromMap(input) {
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const map = new traceMapping.TraceMap(input);
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const gen = new GenMapping({ file: map.file, sourceRoot: map.sourceRoot });
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putAll(cast(gen)._names, map.names);
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putAll(cast(gen)._sources, map.sources);
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cast(gen)._sourcesContent =
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map.sourcesContent || map.sources.map(() => null);
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cast(gen)._mappings = traceMapping.decodedMappings(map);
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if (map.ignoreList) putAll(cast(gen)._ignoreList, map.ignoreList);
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return gen;
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}
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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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function allMappings(map) {
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const out = [];
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const { _mappings: mappings, _sources: sources, _names: names } = cast(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) 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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// This split declaration is only so that terser can elminiate the static initialization block.
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function addSegmentInternal(
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skipable,
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map,
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genLine,
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genColumn,
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source,
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sourceLine,
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sourceColumn,
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name,
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content
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) {
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const {
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_mappings: mappings,
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_sources: sources,
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_sourcesContent: sourcesContent,
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_names: names,
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} = cast(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)) return;
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return insert(line, index, [genColumn]);
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}
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const sourcesIndex = setArray.put(sources, source);
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const namesIndex = name ? setArray.put(names, name) : NO_NAME;
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if (sourcesIndex === sourcesContent.length)
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sourcesContent[sourcesIndex] =
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content !== null && content !== void 0 ? content : null;
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if (
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skipable &&
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skipSource(
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line,
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index,
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sourcesIndex,
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sourceLine,
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sourceColumn,
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namesIndex
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)
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) {
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return;
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}
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return insert(
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line,
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index,
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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]) 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) break;
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}
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if (len < length) mappings.length = len;
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}
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function putAll(setarr, array) {
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for (let i = 0; i < array.length; i++) setArray.put(setarr, 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) 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(
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line,
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index,
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sourcesIndex,
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sourceLine,
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sourceColumn,
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namesIndex
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) {
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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) 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) 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 (
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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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}
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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(
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skipable,
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map,
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generated.line - 1,
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generated.column,
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null,
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null,
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null,
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null,
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null
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);
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}
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return addSegmentInternal(
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skipable,
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map,
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generated.line - 1,
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generated.column,
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source,
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original.line - 1,
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original.column,
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name,
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content
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);
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}
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exports.GenMapping = GenMapping;
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exports.addMapping = addMapping;
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exports.addSegment = addSegment;
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exports.allMappings = allMappings;
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exports.fromMap = fromMap;
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exports.maybeAddMapping = maybeAddMapping;
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exports.maybeAddSegment = maybeAddSegment;
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exports.setIgnore = setIgnore;
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exports.setSourceContent = setSourceContent;
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exports.toDecodedMap = toDecodedMap;
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exports.toEncodedMap = toEncodedMap;
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Object.defineProperty(exports, '__esModule', { value: true });
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});
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//# sourceMappingURL=gen-mapping.umd.js.map
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