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229
node_modules/@swc/helpers/scripts/ast_grep.js
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229
node_modules/@swc/helpers/scripts/ast_grep.js
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import { parseFiles } from "@ast-grep/napi";
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import MagicString from "magic-string";
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import { chalk, fs, path } from "zx";
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import { errors } from "./errors.js";
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import { root } from "./utils.js";
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/**
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* @typedef {import("@ast-grep/napi").SgNode} SgNode
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*/
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export function ast_grep() {
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const task_queue = [];
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const task = parseFiles([root("esm")], (err, tree) => {
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const filename = path.basename(tree.filename(), ".js");
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if (filename === "index") {
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return;
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}
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const source = new MagicString(tree.root().text());
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source.prepend(`"use strict";\n\n`);
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if (filename.startsWith("_ts")) {
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const match = tree.root().find(`export { $NAME as _ } from "tslib"`);
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if (match) {
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const name = match.getMatch("NAME").text();
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const range = match.range();
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source.update(
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range.start.index,
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range.end.index,
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`exports._ = require("tslib").${name};`,
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);
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task_queue.push(
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fs.writeFile(root("cjs", `${filename}.cjs`), source.toString(), {
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encoding: "utf-8",
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}),
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);
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} else {
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report_noexport(tree.filename());
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}
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return;
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}
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// rewrite export named function
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const match = tree.root().find({
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rule: {
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kind: "export_statement",
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pattern: "export { $FUNC as _ }",
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},
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});
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if (match) {
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const func = match.getMatch("FUNC");
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const func_name = func.text();
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if (func_name !== filename) {
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report_export_mismatch(tree.filename(), match);
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}
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const range = match.range();
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source.update(
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range.start.index,
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range.end.index,
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`exports._ = ${func_name};`,
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);
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// since we match the { export x as _ } pattern,
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// we need to find the assignment expression from the root
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tree
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.root()
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.findAll({
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rule: {
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pattern: func_name,
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kind: "identifier",
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inside: { kind: "assignment_expression", field: "left" },
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},
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})
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.forEach((match) => {
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const range = match.range();
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source.prependLeft(range.start.index, `exports._ = `);
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});
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} else {
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report_noexport(tree.filename(tree.filename()));
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}
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// rewrite import
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tree
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.root()
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.findAll({ rule: { pattern: `import { _ as $BINDING } from "$SOURCE"` } })
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.forEach((match) => {
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const import_binding = match.getMatch("BINDING").text();
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const import_source = match.getMatch("SOURCE").text();
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const import_basename = path.basename(import_source, ".js");
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if (import_binding !== import_basename) {
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report_import_mismatch(tree.filename(), match);
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}
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const range = match.range();
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source.update(
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range.start.index,
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range.end.index,
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`var ${import_binding} = require("./${import_binding}.cjs");`,
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);
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tree
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.root()
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.findAll({
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rule: {
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pattern: import_binding,
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kind: "identifier",
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inside: {
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not: {
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kind: "import_specifier",
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},
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},
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},
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})
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.forEach((match) => {
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const range = match.range();
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const ref_name = match.text();
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source.update(
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range.start.index,
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range.end.index,
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`${ref_name}._`,
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);
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});
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});
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task_queue.push(
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fs.writeFile(root("cjs", `${filename}.cjs`), source.toString(), {
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encoding: "utf-8",
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}),
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);
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});
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task_queue.push(task);
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return task_queue;
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}
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/**
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* @param {string} filename
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* @param {SgNode} match
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*/
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function report_export_mismatch(filename, match) {
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const func = match.getMatch("FUNC");
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const func_range = func.range();
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const text = match.text().split("\n");
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const offset = func_range.start.line - match.range().start.line;
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text.splice(
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offset + 1,
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text.length,
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chalk.red(
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[
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" ".repeat(func_range.start.column),
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"^".repeat(func_range.end.column - func_range.start.column),
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]
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.join(""),
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),
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);
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errors.push(
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[
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`${chalk.bold.red("error")}: mismatch exported function name.`,
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"",
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`${chalk.blue("-->")} ${filename}:${func_range.start.line + 1}:${func_range.start.column + 1}`,
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"",
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...text,
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"",
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`${
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chalk.bold(
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"note:",
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)
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} The exported name should be the same as the filename.`,
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"",
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]
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.join("\n"),
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);
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}
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/**
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* @param {string} filename
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* @param {SgNode} match
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*/
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function report_import_mismatch(filename, match) {
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const binding_range = match.getMatch("BINDING").range();
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const source_range = match.getMatch("SOURCE").range();
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errors.push(
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[
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`${chalk.bold.red("error")}: mismatch imported binding name.`,
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"",
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`${chalk.blue("-->")} ${filename}:${match.range().start.line + 1}`,
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"",
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match.text(),
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[
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" ".repeat(binding_range.start.column),
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chalk.red("^".repeat(binding_range.end.column - binding_range.start.column)),
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" ".repeat(source_range.start.column - binding_range.end.column),
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chalk.blue("-".repeat(source_range.end.column - source_range.start.column)),
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]
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.join(""),
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`${
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chalk.bold(
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"note:",
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)
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} The imported binding name should be the same as the import source basename.`,
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"",
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]
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.join("\n"),
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);
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}
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/**
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* @param {string} filename
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*/
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function report_noexport(filename) {
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errors.push(
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[`${chalk.bold.red("error")}: exported name not found`, `${chalk.blue("-->")} ${filename}`].join("\n"),
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);
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}
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