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import { dirname, resolve } from "node:path";
import {
allGeneratedPositionsFor,
LEAST_UPPER_BOUND,
originalPositionFor,
type TraceMap,
type Needle,
type SourceMapSegment,
type DecodedSourceMap,
type SourceMap,
} from "@jridgewell/trace-mapping";
import { type Node } from "estree";
const WORD_PATTERN = /(\w+|\s|[^\w\s])/g;
const INLINE_MAP_PATTERN = /#\s*sourceMappingURL=(.*)\s*$/m;
const BASE_64_PREFIX = "data:application/json;base64,";
/** How often should offset calculations be cached */
const CACHE_THRESHOLD = 250;
export class Locator {
#cache = new Map<number, Needle>();
#codeParts: string[];
#map: TraceMap;
#directory: string;
constructor(code: string, map: TraceMap, directory: string) {
this.#codeParts = code.split("");
this.#map = map;
this.#directory = directory;
}
reset() {
this.#cache.clear();
this.#codeParts = [];
}
offsetToNeedle(offset: number): Needle {
const closestThreshold =
Math.floor(offset / CACHE_THRESHOLD) * CACHE_THRESHOLD;
const cacheHit = this.#cache.get(closestThreshold);
let current = cacheHit ? closestThreshold : 0;
let line = cacheHit?.line ?? 1;
let column = cacheHit?.column ?? 0;
for (let i = current; i <= this.#codeParts.length; i++) {
const char = this.#codeParts[i];
if (current === offset) {
return { line, column };
}
// Handle \r\n EOLs on next iteration
if (char === "\r") {
continue;
}
if (current % CACHE_THRESHOLD === 0) {
this.#cache.set(current, { line, column });
}
if (char === "\n") {
line++;
column = 0;
} else {
column++;
}
current++;
}
return { line, column };
}
getLoc(node: Pick<Node, "start" | "end">) {
const startNeedle = this.offsetToNeedle(node.start);
const start = getPosition(startNeedle, this.#map);
if (start === null) {
// Does not exist in source maps, e.g. generated code
return null;
}
// End-mapping tracing logic from istanbul-lib-source-maps
const endNeedle = this.offsetToNeedle(node.end);
endNeedle.column -= 1;
let end = getPosition(endNeedle, this.#map);
// e.g. tsc that doesnt include } in source maps
if (end === null) {
endNeedle.column++;
end = getPosition(endNeedle, this.#map);
}
if (end === null) {
// Does not exist in source maps, e.g. generated code
return null;
}
const loc = { start, end };
const afterEndMappings = allGeneratedPositionsFor(this.#map, {
source: loc.end.filename,
line: loc.end.line,
column: loc.end.column + 1,
bias: LEAST_UPPER_BOUND,
});
if (afterEndMappings.length === 0) {
loc.end.column = Infinity;
} else {
for (const mapping of afterEndMappings) {
Iif (mapping.line === null) continue;
const original = originalPositionFor(this.#map, mapping);
Eif (original.line === loc.end.line) {
loc.end = { ...original, filename: original.source! };
break;
}
}
}
return loc;
}
getSourceLines(loc: { start: Needle; end: Needle }, filename: string) {
const index = this.#map.resolvedSources.findIndex(
(source) => source === filename || resolve(this.#directory, source),
);
const sourcesContent = this.#map.sourcesContent?.[index];
Iif (sourcesContent == null) {
return null;
}
const lines = sourcesContent
.split("\n")
.slice(loc.start.line - 1, loc.end.line);
lines[0] = lines[0].slice(loc.start.column);
lines[lines.length - 1] = lines[lines.length - 1].slice(0, loc.end.column);
return lines.join("\n");
}
}
function getPosition(needle: Needle, map: TraceMap) {
let position = originalPositionFor(map, needle);
if (position.source == null) {
position = originalPositionFor(map, {
column: needle.column,
line: needle.line,
bias: LEAST_UPPER_BOUND,
});
}
if (position.source == null) {
return null;
}
return {
line: position.line,
column: position.column,
filename: position.source,
};
}
export function createEmptySourceMap(
filename: string,
code: string,
): DecodedSourceMap {
const mappings: SourceMapSegment[][] = [];
// Identical mappings as "magic-string"'s { hires: "boundary" }
for (const [line, content] of code.split("\n").entries()) {
const parts = content.match(WORD_PATTERN) || [];
const segments: SourceMapSegment[] = [];
let column = 0;
for (const part of parts) {
segments.push([column, 0, line, column]);
column += part.length;
}
mappings.push(segments);
}
return {
version: 3,
mappings,
file: filename,
sources: [filename],
sourcesContent: [code],
names: [],
};
}
export async function getInlineSourceMap(filename: string, code: string) {
const matches = code.match(INLINE_MAP_PATTERN);
const match = matches?.[1];
if (!match) return null;
try {
if (match.includes(BASE_64_PREFIX)) {
const encoded = match.split(BASE_64_PREFIX).at(-1) || "";
const decoded = atob(encoded);
return JSON.parse(decoded) as SourceMap;
}
const directory = dirname(filename);
const content = await readFile(resolve(directory, match), "utf-8");
return JSON.parse(content) as SourceMap;
} catch {
return null;
}
}
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