Press n or j to go to the next uncovered block, b, p or k for the previous block.
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import { fileURLToPath } from "node:url";
import { TraceMap } from "@jridgewell/trace-mapping";
import { type Node } from "estree";
import { type FunctionNodes, getFunctionName, type getWalker } from "./ast";
import {
addBranch,
addFunction,
addStatement,
type Branch,
type CoverageMapData,
createCoverageMapData,
} from "./coverage-map";
import { createEmptySourceMap, getInlineSourceMap, Locator } from "./location";
import { getCount, normalize } from "./script-coverage";
import type { Options } from "./types";
type Normalized = ReturnType<typeof normalize>;
export class CoverageMapper<T = Node> {
private constructor(
private locator: Locator,
private coverageMapData: CoverageMapData,
private ranges: Normalized,
private wrapperLength: number,
private directory: string,
private onIgnoreNode: ReturnType<typeof getWalker>["onIgnore"],
private ignoreNode?: Options<T>["ignoreNode"],
private ignoreSourceCode?: Options<T>["ignoreSourceCode"],
) {}
static async create<T = Node, Program = T & { type: "Program" }>(
options: Options<T, Program>,
onIgnoreNode: ReturnType<typeof getWalker>["onIgnore"],
): Promise<CoverageMapper<T>> {
const filename = fileURLToPath(options.coverage.url);
const directory = dirname(filename);
const map = new TraceMap(
(options.sourceMap as typeof options.sourceMap & { version: 3 }) ||
(await getInlineSourceMap(filename, options.code)) ||
createEmptySourceMap(filename, options.code),
);
return new CoverageMapper<T>(
new Locator(options.code, map, directory),
createCoverageMapData(filename, map),
normalize(options.coverage),
options.wrapperLength || 0,
directory,
onIgnoreNode,
options.ignoreNode,
options.ignoreSourceCode,
);
}
onFunction(
node: FunctionNodes,
positions: {
loc: Pick<Node, "start" | "end">;
decl: Pick<Node, "start" | "end">;
},
) {
Iif (this.#onIgnore(node, "function")) {
return;
}
const loc = this.locator.getLoc(positions.loc);
if (loc === null) return;
const decl = this.locator.getLoc(positions.decl);
Iif (decl === null) return;
const covered = getCount(
{
startOffset: node.start + this.wrapperLength,
endOffset: node.end + this.wrapperLength,
},
this.ranges,
);
if (this.ignoreSourceCode) {
const current = this.locator.getLoc(node) || loc;
const sources = this.locator.getSourceLines(current, this.#getSourceFilename(current));
if (
sources != null &&
this.ignoreSourceCode(sources, "function", {
start: { line: current.start.line, column: current.start.column },
end: { line: current.end.line, column: current.end.column },
})
) {
return;
}
}
addFunction({
coverageMapData: this.coverageMapData,
covered,
loc,
decl,
filename: this.#getSourceFilename(loc),
name: getFunctionName(node),
});
}
onStatement(node: Node, parent?: Node) {
if (this.#onIgnore(parent || node, "statement")) {
return;
}
const loc = this.locator.getLoc(node);
if (loc === null) return;
const covered = getCount(
{
startOffset: (parent || node).start + this.wrapperLength,
endOffset: (parent || node).end + this.wrapperLength,
},
this.ranges,
);
if (this.ignoreSourceCode) {
const current = (parent && this.locator.getLoc(parent)) || loc;
const sources = this.locator.getSourceLines(current, this.#getSourceFilename(current));
if (
sources != null &&
this.ignoreSourceCode(sources, "statement", {
start: { line: current.start.line, column: current.start.column },
end: { line: current.end.line, column: current.end.column },
})
) {
return;
}
}
addStatement({
coverageMapData: this.coverageMapData,
loc,
covered,
filename: this.#getSourceFilename(loc),
});
}
onBranch(type: Branch, node: Node, branches: (Node | null | undefined)[]) {
if (this.#onIgnore(node, "branch")) {
return;
}
const loc = this.locator.getLoc(node);
if (loc === null) return;
const locations = [];
const covered: number[] = [];
for (const branch of branches) {
if (!branch) {
locations.push({
start: { line: undefined, column: undefined },
end: { line: undefined, column: undefined },
});
const count = getCount(
{
startOffset: node.start + this.wrapperLength,
endOffset: node.end + this.wrapperLength,
},
this.ranges,
);
const previous = covered.at(-1) || 0;
covered.push(count - previous);
continue;
}
const location = this.locator.getLoc(branch);
if (location !== null) {
locations.push(location);
}
const bias = branch.type === "BlockStatement" ? 1 : 0;
covered.push(
getCount(
{
startOffset: branch.start + bias + this.wrapperLength,
endOffset: branch.end - bias + this.wrapperLength,
},
this.ranges,
),
);
}
if (type === "if") {
if (locations.length > 0) {
locations[0] = loc;
}
}
if (locations.length === 0) {
return;
}
Iif (this.ignoreSourceCode) {
const sources = this.locator.getSourceLines(loc, this.#getSourceFilename(loc));
if (
sources != null &&
this.ignoreSourceCode(sources, "branch", {
start: { line: loc.start.line, column: loc.start.column },
end: { line: loc.end.line, column: loc.end.column },
})
) {
return;
}
}
addBranch({
coverageMapData: this.coverageMapData,
loc,
locations,
type,
covered,
filename: this.#getSourceFilename(loc),
});
}
generate(): CoverageMapData {
this.locator.reset();
return this.coverageMapData;
}
#getSourceFilename(position: {
start: { filename: string | null };
end: { filename: string | null };
}) {
const sourceFilename = position.start.filename || position.end.filename;
Iif (!sourceFilename) {
throw new Error(`Missing original filename for ${JSON.stringify(position, null, 2)}`);
}
if (sourceFilename.startsWith("file://")) {
return fileURLToPath(sourceFilename);
}
return resolve(this.directory, sourceFilename);
}
#onIgnore(node: Node, type: "function" | "statement" | "branch") {
if (!this.ignoreNode) {
return false;
}
const scope = this.ignoreNode(node as T, type);
if (scope === "ignore-this-and-nested-nodes") {
this.onIgnoreNode(node);
}
return scope;
}
}
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