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Copyright 2015, Yahoo Inc.
Copyrights licensed under the New BSD License. See the accompanying LICENSE file for terms.
*/
import {
originalPositionFor,
allGeneratedPositionsFor,
GREATEST_LOWER_BOUND,
LEAST_UPPER_BOUND,
} from "@jridgewell/trace-mapping";
import type {
GeneratedMapping,
InvalidGeneratedMapping,
InvalidOriginalMapping,
OriginalMapping,
TraceMap,
} from "@jridgewell/trace-mapping";
import type { Location, Range } from "@vitest/istanbul-lib-coverage";
import * as pathutils from "./pathutils";
/** an original source position as resolved through a source map */
interface OriginalPosition {
source: string | null;
line: number | null;
column: number | null;
name?: string | null;
}
/** the result of mapping a generated range back to an original source */
export interface Mapping {
source: string;
loc: Range;
}
/**
* AST ranges are inclusive for start positions and exclusive for end positions.
* Source maps are also logically ranges over text, though interacting with
* them is generally achieved by working with explicit positions.
*
* When finding the _end_ location of an AST item, the range behavior is
* important because what we're asking for is the _end_ of whatever range
* corresponds to the end location we seek.
*
* This boils down to the following steps, conceptually, though the source-map
* library doesn't expose primitives to do this nicely:
*
* 1. Find the range on the generated file that ends at, or exclusively
* contains the end position of the AST node.
* 2. Find the range on the original file that corresponds to
* that generated range.
* 3. Find the _end_ location of that original range.
*/
function originalEndPositionFor(
sourceMap: TraceMap,
generatedEnd: Location,
): OriginalPosition | null {
// Given the generated location, find the original location of the mapping
// that corresponds to a range on the generated file that overlaps the
// generated file end location. Note however that this position on its
// own is not useful because it is the position of the _start_ of the range
// on the original file, and we want the _end_ of the range.
let beforeEndMapping = originalPositionTryBoth(
sourceMap,
generatedEnd.line,
generatedEnd.column - 1,
);
if (beforeEndMapping.source === null) {
// search the previous lines as the mapping was not found on the same line
for (let line = generatedEnd.line; line > 0 && beforeEndMapping.source === null; line--) {
beforeEndMapping = originalPositionTryBoth(sourceMap, line, Infinity);
}
if (beforeEndMapping.source === null) {
return null;
}
}
// Convert that original position back to a generated one, with a bump
// to the right, and a rightward bias. Since 'generatedPositionFor' searches
// for mappings in the original-order sorted list, this will find the
// mapping that corresponds to the one immediately after the
// beforeEndMapping mapping.
const afterEndMappings: (GeneratedMapping | InvalidGeneratedMapping)[] = allGeneratedPositionsFor(
sourceMap,
{
source: beforeEndMapping.source,
line: beforeEndMapping.line,
column: beforeEndMapping.column + 1,
bias: LEAST_UPPER_BOUND,
},
);
for (let i = 0; i < afterEndMappings.length; i++) {
const afterEndMapping = afterEndMappings[i];
Iif (afterEndMapping.line === null) continue;
const original = originalPositionFor(sourceMap, afterEndMapping);
// If the lines match, it means that something comes after our mapping,
// so it must end where this one begins.
Eif (original.line === beforeEndMapping.line) return original;
}
// If a generated mapping wasn't found (or all that were found were not on
// the same line), then there's nothing after this range and we can
// consider it to extend to infinity.
return {
source: beforeEndMapping.source,
line: beforeEndMapping.line,
column: Infinity,
};
}
/**
* Attempts to determine the original source position, first
* returning the closest element to the left (GREATEST_LOWER_BOUND),
* and next returning the closest element to the right (LEAST_UPPER_BOUND).
*/
function originalPositionTryBoth(
sourceMap: TraceMap,
line: number,
column: number,
): OriginalMapping | InvalidOriginalMapping {
const mapping = originalPositionFor(sourceMap, {
line,
column,
bias: GREATEST_LOWER_BOUND,
});
if (mapping.source === null) {
return originalPositionFor(sourceMap, {
line,
column,
bias: LEAST_UPPER_BOUND,
});
} else {
return mapping;
}
}
function isInvalidPosition(pos: Partial<Location> | undefined): boolean {
return (
!pos ||
typeof pos.line !== "number" ||
typeof pos.column !== "number" ||
pos.line < 0 ||
pos.column < 0
);
}
/**
* determines the original position for a given location
* @param sourceMap the source map
* @param generatedLocation the original location Object
* @returns the remapped location Object
*/
export default function getMapping(
sourceMap: TraceMap,
generatedLocation: Range | null | undefined,
origFile: string,
): Mapping | null {
Iif (!generatedLocation) {
return null;
}
if (isInvalidPosition(generatedLocation.start) || isInvalidPosition(generatedLocation.end)) {
return null;
}
const start = originalPositionTryBoth(
sourceMap,
generatedLocation.start.line,
generatedLocation.start.column,
);
let end: OriginalPosition | null = originalEndPositionFor(sourceMap, generatedLocation.end);
/* istanbul ignore if: edge case too hard to test for */
if (!(start && end)) {
return null;
}
Iif (!(start.source && end.source)) {
return null;
}
Iif (start.source !== end.source) {
return null;
}
/* istanbul ignore if: edge case too hard to test for */
if (start.line === null || start.column === null) {
return null;
}
/* istanbul ignore if: edge case too hard to test for */
if (end.line === null || end.column === null) {
return null;
}
Iif (start.line === end.line && start.column === end.column) {
end = originalPositionFor(sourceMap, {
line: generatedLocation.end.line,
column: generatedLocation.end.column,
bias: LEAST_UPPER_BOUND,
});
end.column! -= 1;
}
return {
source: pathutils.relativeTo(start.source, origFile),
loc: {
start: {
line: start.line,
column: start.column,
},
end: {
line: end.line!,
column: end.column!,
},
},
};
}
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