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import { readFile } from "node:fs/promises";
import { dirname, resolve } from "node:path";
import {
allGeneratedPositionsFor,
LEAST_UPPER_BOUND,
originalPositionFor,
type TraceMap,
type Needle,
type SourceMapSegment,
type DecodedSourceMap,
type SourceMap,
sourceContentFor,
} from "@jridgewell/trace-mapping";
import { type Node } from "estree";
import { getIgnoredLines } from "./ignore-hints";
const WORD_PATTERN = /(\w+|\s|[^\w\s])/g;
const INLINE_MAP_PATTERN = /#\s*sourceMappingURL=(.*)\s*$/m;
const BASE_64_PREFIX = "data:application/json;base64,";
const NEW_LINE_CHAR_CODE = "\n".charCodeAt(0);
type Filename = string;
export class Locator {
/** Offsets of each line's first character */
#lineStarts: number[] = [0];
#map: TraceMap;
#directory: string;
#ignoredLines = new Map<Filename, ReturnType<typeof getIgnoredLines>>();
constructor(code: string, map: TraceMap, directory: string) {
for (let offset = 0; offset < code.length; offset++) {
if (code.charCodeAt(offset) === NEW_LINE_CHAR_CODE) {
this.#lineStarts.push(offset + 1);
}
}
this.#map = map;
this.#directory = directory;
}
reset() {
this.#ignoredLines.clear();
this.#lineStarts = [0];
}
offsetToNeedle(offset: number): Needle {
let low = 0;
let high = this.#lineStarts.length - 1;
while (low <= high) {
const mid = (low + high) >> 1;
if (this.#lineStarts[mid] <= offset) {
low = mid + 1;
} else {
high = mid - 1;
}
}
return { line: high + 1, column: offset - this.#lineStarts[high] };
}
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);
if (end === null) {
// search the previous lines as the mapping was not found on the same line
// e.g. tsc that doesnt include } in source maps
for (let line = endNeedle.line; line >= startNeedle.line && end === null; line--) {
end = getPosition({ line, column: Infinity }, this.#map);
}
// Does not exist in source maps, e.g. generated code
Iif (end === null) 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;
}
}
}
const filename = loc.start.filename;
let ignoredLines = this.#ignoredLines.get(filename);
if (!ignoredLines) {
const sources = sourceContentFor(this.#map, filename);
ignoredLines = getIgnoredLines(sources ?? tryReadFileSync(filename));
this.#ignoredLines.set(filename, ignoredLines);
}
// Anything that starts between the line ignore hints is ignored
if (ignoredLines.has(loc.start.line)) {
return null;
}
return loc;
}
getSourceLines(loc: { start: Needle; end: Needle }, filename: string) {
const index = this.#map.resolvedSources.findIndex(
(source) => source === filename || resolve(this.#directory, source) === filename,
);
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);
// eslint-disable-next-line e18e/prefer-array-at -- https://github.com/e18e/eslint-plugin/issues/27
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;
}
}
function tryReadFileSync(filename: string) {
try {
return readFileSync(filename, "utf8");
} catch {
return undefined;
}
}
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