Press n or j to go to the next uncovered block, b, p or k for the previous block.
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type ObjectMethod,
type ClassMethod,
type ClassBody as BabelClassBody,
type Node as BabelNode,
} from "@babel/types";
import type {
ArrowFunctionExpression,
BreakStatement,
ContinueStatement,
DebuggerStatement,
DoWhileStatement,
Expression,
ExpressionStatement,
ForInStatement,
ForOfStatement,
ForStatement,
FunctionDeclaration,
IfStatement,
LabeledStatement,
MethodDefinition,
Node,
Property,
ReturnStatement,
SwitchStatement,
ThrowStatement,
TryStatement,
VariableDeclarator,
WhileStatement,
WithStatement,
ConditionalExpression,
LogicalExpression,
AssignmentPattern,
FunctionExpression,
ClassBody,
BlockStatement,
SwitchCase,
} from "estree";
import { walk as walkAst } from "estree-walker";
import { type IgnoreHint } from "./ignore-hints";
declare module "estree" {
interface BaseNode {
start: number;
end: number;
}
interface ParenthesizedExpression extends BaseExpression {
type: "ParenthesizedExpression";
expression: Expression;
}
interface ExpressionMap {
ParenthesizedExpression: ParenthesizedExpression;
}
}
interface Visitors {
// Functions
onFunctionDeclaration: (node: FunctionDeclaration) => void;
onFunctionExpression: (node: FunctionExpression) => void;
onArrowFunctionExpression: (node: ArrowFunctionExpression) => void;
onMethodDefinition: (node: MethodDefinition) => void;
onProperty: (node: Property) => void;
onClassMethod: (node: ClassMethod) => void;
onObjectMethod: (node: ObjectMethod) => void;
// Statements
onExpressionStatement: (node: ExpressionStatement) => void;
onBreakStatement: (node: BreakStatement) => void;
onContinueStatement: (node: ContinueStatement) => void;
onDebuggerStatement: (node: DebuggerStatement) => void;
onReturnStatement: (node: ReturnStatement) => void;
onThrowStatement: (node: ThrowStatement) => void;
onTryStatement: (node: TryStatement) => void;
onForStatement: (node: ForStatement) => void;
onForInStatement: (node: ForInStatement) => void;
onForOfStatement: (node: ForOfStatement) => void;
onWhileStatement: (node: WhileStatement) => void;
onDoWhileStatement: (node: DoWhileStatement) => void;
onWithStatement: (node: WithStatement) => void;
onLabeledStatement: (node: LabeledStatement) => void;
onVariableDeclarator: (node: VariableDeclarator) => void;
onClassBody: (node: ClassBody | BabelClassBody) => void;
// Branches
onIfStatement: (node: IfStatement, branches: (Node | null | undefined)[]) => void;
onSwitchStatement: (node: SwitchStatement, cases: SwitchCase[]) => void;
onConditionalExpression: (
node: ConditionalExpression,
branches: (Node | null | undefined)[],
) => void;
onLogicalExpression: (node: LogicalExpression, branches: (Node | null | undefined)[]) => void;
onAssignmentPattern: (node: AssignmentPattern) => void;
}
export type FunctionNodes = Parameters<
Visitors[
| "onArrowFunctionExpression"
| "onFunctionDeclaration"
| "onFunctionExpression"
| "onMethodDefinition"
| "onProperty"]
>[0];
export function getWalker() {
let nextIgnore: Node | false = false;
function onIgnore(node: Node) {
nextIgnore = node;
}
function walk(
ast: unknown,
ignoreHints: IgnoreHint[],
ignoreClassMethods: string[] | undefined,
visitors: Visitors,
) {
return walkAst(ast as Node, {
enter(node) {
if (nextIgnore !== false) {
return;
}
const hint = getIgnoreHint(node);
if (hint === "next") {
return onIgnore(node);
}
// `isSkipped` is also true for a nested logical expression, because the
// outermost one registers the "binary-expr" branch for the whole chain.
// The walker must still visit the children of the nested one.
if (isSkipped(node) && node.type !== "LogicalExpression") {
onIgnore(node);
}
switch (node.type) {
// Functions
case "FunctionDeclaration": {
return visitors.onFunctionDeclaration(node);
}
case "FunctionExpression": {
if (ignoreClassMethods && node.id?.name) {
if (ignoreClassMethods.includes(node.id.name)) {
return onIgnore(node);
}
}
return visitors.onFunctionExpression(node);
}
case "MethodDefinition": {
return visitors.onMethodDefinition(node);
}
case "Property": {
return visitors.onProperty(node);
}
case "ArrowFunctionExpression": {
// Get inner body in cases where parenthesis are preserverd, e.g. acorn, oxc: https://oxc.rs/docs/learn/ecmascript/grammar.html#parenthesized-expression
if (node.body?.type === "ParenthesizedExpression") {
node.body = node.body.expression;
}
return visitors.onArrowFunctionExpression(node);
}
// Statements
case "ExpressionStatement": {
return visitors.onExpressionStatement(node);
}
case "BreakStatement": {
return visitors.onBreakStatement(node);
}
case "ContinueStatement": {
return visitors.onContinueStatement(node);
}
case "DebuggerStatement": {
return visitors.onDebuggerStatement(node);
}
case "ReturnStatement": {
return visitors.onReturnStatement(node);
}
case "ThrowStatement": {
return visitors.onThrowStatement(node);
}
case "TryStatement": {
return visitors.onTryStatement(node);
}
case "ForStatement": {
return visitors.onForStatement(node);
}
case "ForInStatement": {
return visitors.onForInStatement(node);
}
case "ForOfStatement": {
return visitors.onForOfStatement(node);
}
case "WhileStatement": {
return visitors.onWhileStatement(node);
}
case "DoWhileStatement": {
return visitors.onDoWhileStatement(node);
}
case "WithStatement": {
return visitors.onWithStatement(node);
}
case "LabeledStatement": {
return visitors.onLabeledStatement(node);
}
case "VariableDeclarator": {
return visitors.onVariableDeclarator(node);
}
case "ClassBody": {
const classBody = node as ClassBody | BabelClassBody;
if (ignoreClassMethods) {
for (const child of classBody.body) {
if (child.type === "MethodDefinition" || child.type === "ClassMethod") {
const name = child.key.type === "Identifier" && child.key.name;
if (name && ignoreClassMethods.includes(name)) {
setSkipped(child);
}
}
}
classBody.body = classBody.body.filter(
(child) => !isSkipped(child),
) as typeof classBody.body;
}
return visitors.onClassBody(classBody);
}
// Branches
case "IfStatement": {
const branches = [];
if (node.consequent.type !== "BlockStatement") {
node.consequent = {
type: "BlockStatement",
body: [node.consequent],
start: node.consequent.start,
end: node.consequent.end,
} satisfies BlockStatement;
}
if (node.alternate && node.alternate.type !== "BlockStatement") {
node.alternate = {
type: "BlockStatement",
body: [node.alternate],
start: node.alternate.start,
end: node.alternate.end,
} satisfies BlockStatement;
}
if (hint === "if") {
setSkipped(node.consequent);
} else {
branches.push(node.consequent);
}
if (hint === "else" && node.alternate) {
setSkipped(node.alternate);
} else if (hint !== "if" && hint !== "else") {
branches.push(node.alternate);
}
return visitors.onIfStatement(node, branches);
}
case "SwitchStatement": {
const cases = [];
for (const _case of node.cases) {
if (getIgnoreHint(_case) !== "next") {
cases.push(_case);
}
}
return visitors.onSwitchStatement(node, cases);
}
case "ConditionalExpression": {
const branches = [];
if (node.consequent.type === "ParenthesizedExpression") {
node.consequent = node.consequent.expression;
}
if (node.alternate.type === "ParenthesizedExpression") {
node.alternate = node.alternate.expression;
}
if (getIgnoreHint(node.consequent) === "next") {
setSkipped(node.consequent);
} else {
branches.push(node.consequent);
}
if (getIgnoreHint(node.alternate) === "next") {
setSkipped(node.alternate);
} else {
branches.push(node.alternate);
}
return visitors.onConditionalExpression(node, branches);
}
case "LogicalExpression": {
if (isSkipped(node)) return;
const branches: Node[] = [];
function visit(child: Node) {
if (child.type === "ParenthesizedExpression") {
return visit(child.expression);
}
if (child.type === "LogicalExpression") {
setSkipped(child);
if (getIgnoreHint(child) !== "next") {
visit(child.left);
return visit(child.right);
}
}
branches.push(child);
}
visit(node);
return visitors.onLogicalExpression(node, branches);
}
case "AssignmentPattern": {
return visitors.onAssignmentPattern(node);
}
// @ts-expect-error -- Babel AST
case "ClassMethod": {
return visitors.onClassMethod(node);
}
// @ts-expect-error -- Babel AST
case "ObjectMethod": {
return visitors.onObjectMethod(node);
}
}
},
leave(node) {
if (node === nextIgnore) {
nextIgnore = false;
}
},
});
function getIgnoreHint(node: Node) {
for (const hint of ignoreHints) {
if (hint.loc.end === node.start) {
return hint.type;
}
}
return null;
}
}
return { walk, onIgnore };
}
const skippedNodes = new WeakSet<Node | BabelNode>();
export function getFunctionName(node: Node | BabelNode) {
if (node.type === "Identifier") {
return node.name;
}
if ("id" in node && node.id) {
return getFunctionName(node.id);
}
if ("key" in node && node.key) {
return getFunctionName(node.key);
}
}
function setSkipped(node: Node | BabelNode) {
skippedNodes.add(node);
}
function isSkipped(node: Node | BabelNode) {
return skippedNodes.has(node);
}
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