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