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convertAST.cjs
157 lines (136 loc) 路 3.66 KB
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convertAST.cjs
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const ESLINT_VERSION = require("../utils/eslint-version.cjs");
function* it(children) {
if (Array.isArray(children)) yield* children;
else yield children;
}
function traverse(node, visitorKeys, visitor) {
const { type } = node;
if (!type) return;
const keys = visitorKeys[type];
if (!keys) return;
for (const key of keys) {
for (const child of it(node[key])) {
if (child && typeof child === "object") {
visitor.enter(child);
traverse(child, visitorKeys, visitor);
visitor.exit(child);
}
}
}
}
const convertNodesVisitor = {
enter(node) {
if (node.innerComments) {
delete node.innerComments;
}
if (node.trailingComments) {
delete node.trailingComments;
}
if (node.leadingComments) {
delete node.leadingComments;
}
},
exit(node) {
// Used internally by @babel/parser.
if (node.extra) {
delete node.extra;
}
if (node.loc.identifierName) {
delete node.loc.identifierName;
}
if (node.type === "TypeParameter") {
node.type = "Identifier";
node.typeAnnotation = node.bound;
delete node.bound;
}
// flow: prevent "no-undef"
// for "Component" in: "let x: React.Component"
if (node.type === "QualifiedTypeIdentifier") {
delete node.id;
}
// for "b" in: "var a: { b: Foo }"
if (node.type === "ObjectTypeProperty") {
delete node.key;
}
// for "indexer" in: "var a: {[indexer: string]: number}"
if (node.type === "ObjectTypeIndexer") {
delete node.id;
}
// for "param" in: "var a: { func(param: Foo): Bar };"
if (node.type === "FunctionTypeParam") {
delete node.name;
}
// modules
if (node.type === "ImportDeclaration") {
delete node.isType;
}
// template string range fixes
if (node.type === "TemplateLiteral") {
for (let i = 0; i < node.quasis.length; i++) {
const q = node.quasis[i];
q.range[0] -= 1;
if (q.tail) {
q.range[1] += 1;
} else {
q.range[1] += 2;
}
q.loc.start.column -= 1;
if (q.tail) {
q.loc.end.column += 1;
} else {
q.loc.end.column += 2;
}
if (ESLINT_VERSION >= 8) {
q.start -= 1;
if (q.tail) {
q.end += 1;
} else {
q.end += 2;
}
}
}
}
},
};
function convertNodes(ast, visitorKeys) {
traverse(ast, visitorKeys, convertNodesVisitor);
}
function convertProgramNode(ast) {
ast.type = "Program";
ast.sourceType = ast.program.sourceType;
ast.body = ast.program.body;
delete ast.program;
delete ast.errors;
if (ast.comments.length) {
const lastComment = ast.comments[ast.comments.length - 1];
if (ast.tokens.length) {
const lastToken = ast.tokens[ast.tokens.length - 1];
if (lastComment.end > lastToken.end) {
// If there is a comment after the last token, the program ends at the
// last token and not the comment
ast.range[1] = lastToken.end;
ast.loc.end.line = lastToken.loc.end.line;
ast.loc.end.column = lastToken.loc.end.column;
if (ESLINT_VERSION >= 8) {
ast.end = lastToken.end;
}
}
}
} else {
if (!ast.tokens.length) {
ast.loc.start.line = 1;
ast.loc.end.line = 1;
}
}
if (ast.body && ast.body.length > 0) {
ast.loc.start.line = ast.body[0].loc.start.line;
ast.range[0] = ast.body[0].start;
if (ESLINT_VERSION >= 8) {
ast.start = ast.body[0].start;
}
}
}
module.exports = function convertAST(ast, visitorKeys) {
convertNodes(ast, visitorKeys);
convertProgramNode(ast);
};