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import type { LineRange, MappedPosition } from "source-map-js";
import { SourceMapConsumer } from "source-map-js";
export type LocationRequest = {
line?: number;
column?: number;
url?: string;
};
export type Location = {
line: number; // 0-based
column: number; // 0-based
} & (
| {
verified: true;
}
| {
verified?: false;
message?: string;
}
);
export interface SourceMap {
generatedLocation(request: LocationRequest): Location;
originalLocation(request: LocationRequest): Location;
}
class ActualSourceMap implements SourceMap {
#sourceMap: SourceMapConsumer;
#sources: string[];
constructor(sourceMap: SourceMapConsumer) {
this.#sourceMap = sourceMap;
this.#sources = (sourceMap as any)._absoluteSources;
}
#getSource(url?: string): string {
const sources = this.#sources;
if (!sources.length) {
return "";
}
if (sources.length === 1 || !url) {
return sources[0];
}
for (const source of sources) {
if (url.endsWith(source)) {
return source;
}
}
return "";
}
generatedLocation(request: LocationRequest): Location {
const { line, column, url } = request;
let lineRange: LineRange;
try {
const source = this.#getSource(url);
lineRange = this.#sourceMap.generatedPositionFor({
line: lineTo1BasedLine(line),
column: columnToColumn(column),
source,
});
} catch (error) {
return {
line: lineToLine(line),
column: columnToColumn(column),
verified: false,
message: unknownToError(error),
};
}
if (!locationIsValid(lineRange)) {
return {
line: lineToLine(line),
column: columnToColumn(column),
verified: false,
};
}
const { line: gline, column: gcolumn } = lineRange;
return {
line: lineToLine(gline),
column: columnToColumn(gcolumn),
verified: true,
};
}
originalLocation(request: LocationRequest): Location {
const { line, column } = request;
let mappedPosition: MappedPosition;
try {
mappedPosition = this.#sourceMap.originalPositionFor({
line: lineTo1BasedLine(line),
column: columnToColumn(column),
});
} catch (error) {
return {
line: lineToLine(line),
column: columnToColumn(column),
verified: false,
message: unknownToError(error),
};
}
if (!locationIsValid(mappedPosition)) {
return {
line: lineToLine(line),
column: columnToColumn(column),
verified: false,
};
}
const { line: oline, column: ocolumn } = mappedPosition;
return {
line: lineTo0BasedLine(oline),
column: columnToColumn(ocolumn),
verified: true,
};
}
}
class NoopSourceMap implements SourceMap {
generatedLocation(request: LocationRequest): Location {
const { line, column } = request;
return {
line: lineToLine(line),
column: columnToColumn(column),
verified: true,
};
}
originalLocation(request: LocationRequest): Location {
const { line, column } = request;
return {
line: lineToLine(line),
column: columnToColumn(column),
verified: true,
};
}
}
const defaultSourceMap = new NoopSourceMap();
export function SourceMap(url?: string): SourceMap {
if (!url || !url.startsWith("data:")) {
return defaultSourceMap;
}
try {
const [_, base64] = url.split(",", 2);
const decoded = Buffer.from(base64, "base64url").toString("utf8");
const schema = JSON.parse(decoded);
const sourceMap = new SourceMapConsumer(schema);
return new ActualSourceMap(sourceMap);
} catch (error) {
console.warn("Failed to parse source map URL", url);
}
return defaultSourceMap;
}
function lineTo1BasedLine(line?: number): number {
return numberIsValid(line) ? line + 1 : 1;
}
function lineTo0BasedLine(line?: number): number {
return numberIsValid(line) ? line - 1 : 0;
}
function lineToLine(line?: number): number {
return numberIsValid(line) ? line : 0;
}
function columnToColumn(column?: number): number {
return numberIsValid(column) ? column : 0;
}
function locationIsValid(location: Location): location is Location {
const { line, column } = location;
return numberIsValid(line) && numberIsValid(column);
}
function numberIsValid(number?: number): number is number {
return typeof number === "number" && isFinite(number) && number >= 0;
}
function unknownToError(error: unknown): string {
if (error instanceof Error) {
const { message } = error;
return message;
}
return String(error);
}
|
