Files
vscode/build/lib/mangleTypeScript.js
2022-11-15 09:05:07 +01:00

484 lines
39 KiB
JavaScript

"use strict";
/*---------------------------------------------------------------------------------------------
* Copyright (c) Microsoft Corporation. All rights reserved.
* Licensed under the MIT License. See License.txt in the project root for license information.
*--------------------------------------------------------------------------------------------*/
Object.defineProperty(exports, "__esModule", { value: true });
exports.Mangler = void 0;
const ts = require("typescript");
const path = require("path");
const fs = require("fs");
const process_1 = require("process");
class ShortIdent {
static _keywords = new Set(['await', 'break', 'case', 'catch', 'class', 'const', 'continue', 'debugger',
'default', 'delete', 'do', 'else', 'export', 'extends', 'false', 'finally', 'for', 'function', 'if',
'import', 'in', 'instanceof', 'let', 'new', 'null', 'return', 'static', 'super', 'switch', 'this', 'throw',
'true', 'try', 'typeof', 'var', 'void', 'while', 'with', 'yield']);
static alphabet = [];
static {
for (let i = 97; i < 122; i++) {
this.alphabet.push(String.fromCharCode(i));
}
for (let i = 65; i < 90; i++) {
this.alphabet.push(String.fromCharCode(i));
}
}
_value = 0;
_isNameTaken;
constructor(isNameTaken) {
this._isNameTaken = name => ShortIdent._keywords.has(name) || isNameTaken(name);
}
next() {
const candidate = ShortIdent.convert(this._value);
this._value++;
if (this._isNameTaken(candidate)) {
// try again
return this.next();
}
return candidate;
}
static convert(n) {
const base = this.alphabet.length;
let result = '';
do {
const rest = n % base;
result += this.alphabet[rest];
n = (n / base) | 0;
} while (n > 0);
return result;
}
}
var FieldType;
(function (FieldType) {
FieldType[FieldType["Public"] = 0] = "Public";
FieldType[FieldType["Protected"] = 1] = "Protected";
FieldType[FieldType["Private"] = 2] = "Private";
})(FieldType || (FieldType = {}));
class ClassData {
fileName;
node;
fields = new Map();
replacements;
parent;
children;
constructor(fileName, node) {
// analyse all fields (properties and methods). Find usages of all protected and
// private ones and keep track of all public ones (to prevent naming collisions)
this.fileName = fileName;
this.node = node;
const candidates = [];
for (const member of node.members) {
if (ts.isMethodDeclaration(member)) {
// method `foo() {}`
candidates.push(member);
}
else if (ts.isPropertyDeclaration(member)) {
// property `foo = 234`
candidates.push(member);
}
else if (ts.isGetAccessor(member)) {
// getter: `get foo() { ... }`
candidates.push(member);
}
else if (ts.isSetAccessor(member)) {
// setter: `set foo() { ... }`
candidates.push(member);
}
else if (ts.isConstructorDeclaration(member)) {
// constructor-prop:`constructor(private foo) {}`
for (const param of member.parameters) {
if (hasModifier(param, ts.SyntaxKind.PrivateKeyword)
|| hasModifier(param, ts.SyntaxKind.ProtectedKeyword)
|| hasModifier(param, ts.SyntaxKind.PublicKeyword)
|| hasModifier(param, ts.SyntaxKind.ReadonlyKeyword)) {
candidates.push(param);
}
}
}
}
for (const member of candidates) {
const ident = ClassData._getMemberName(member);
if (!ident) {
continue;
}
const type = ClassData._getFieldType(member);
this.fields.set(ident, { type, pos: member.name.getStart() });
}
}
static _getMemberName(node) {
if (!node.name) {
return undefined;
}
const { name } = node;
let ident = name.getText();
if (name.kind === ts.SyntaxKind.ComputedPropertyName) {
if (name.expression.kind !== ts.SyntaxKind.StringLiteral) {
// unsupported: [Symbol.foo] or [abc + 'field']
return;
}
// ['foo']
ident = name.expression.getText().slice(1, -1);
}
return ident;
}
static _getFieldType(node) {
if (hasModifier(node, ts.SyntaxKind.PrivateKeyword)) {
return 2 /* FieldType.Private */;
}
else if (hasModifier(node, ts.SyntaxKind.ProtectedKeyword)) {
return 1 /* FieldType.Protected */;
}
else {
return 0 /* FieldType.Public */;
}
}
static _shouldMangle(type) {
return type === 2 /* FieldType.Private */
|| type === 1 /* FieldType.Protected */;
}
static makeImplicitPublicActuallyPublic(data, reportViolation) {
// TS-HACK
// A subtype can make an inherited protected field public. To prevent accidential
// mangling of public fields we mark the original (protected) fields as public...
for (const [name, info] of data.fields) {
if (info.type !== 0 /* FieldType.Public */) {
continue;
}
let parent = data.parent;
while (parent) {
if (parent.fields.get(name)?.type === 1 /* FieldType.Protected */) {
const parentPos = parent.node.getSourceFile().getLineAndCharacterOfPosition(parent.fields.get(name).pos);
const infoPos = data.node.getSourceFile().getLineAndCharacterOfPosition(info.pos);
reportViolation(`'${name}' from ${parent.fileName}:${parentPos.line + 1}`, `${data.fileName}:${infoPos.line + 1}`);
parent.fields.get(name).type = 0 /* FieldType.Public */;
}
parent = parent.parent;
}
}
}
static fillInReplacement(data) {
if (data.replacements) {
// already done
return;
}
// fill in parents first
if (data.parent) {
ClassData.fillInReplacement(data.parent);
}
data.replacements = new Map();
const identPool = new ShortIdent(name => {
// locally taken
if (data._isNameTaken(name)) {
return true;
}
// parents
let parent = data.parent;
while (parent) {
if (parent._isNameTaken(name)) {
return true;
}
parent = parent.parent;
}
// children
if (data.children) {
const stack = [...data.children];
while (stack.length) {
const node = stack.pop();
if (node._isNameTaken(name)) {
return true;
}
if (node.children) {
stack.push(...node.children);
}
}
}
return false;
});
for (const [name, info] of data.fields) {
if (ClassData._shouldMangle(info.type)) {
const shortName = identPool.next();
data.replacements.set(name, shortName);
}
}
}
// a name is taken when a field that doesn't get mangled exists or
// when the name is already in use for replacement
_isNameTaken(name) {
if (this.fields.has(name) && !ClassData._shouldMangle(this.fields.get(name).type)) {
// public field
return true;
}
if (this.replacements) {
for (const shortName of this.replacements.values()) {
if (shortName === name) {
// replaced already (happens wih super types)
return true;
}
}
}
if (this.node.getSourceFile().identifiers instanceof Map) {
// taken by any other usage
if (this.node.getSourceFile().identifiers.has(name)) {
return true;
}
}
return false;
}
lookupShortName(name) {
let value = this.replacements.get(name);
let parent = this.parent;
while (parent) {
if (parent.replacements.has(name) && parent.fields.get(name)?.type === 1 /* FieldType.Protected */) {
value = parent.replacements.get(name) ?? value;
}
parent = parent.parent;
}
return value;
}
// --- parent chaining
addChild(child) {
this.children ??= [];
this.children.push(child);
child.parent = this;
}
}
class StaticLanguageServiceHost {
projectPath;
_cmdLine;
_scriptSnapshots = new Map();
constructor(projectPath) {
this.projectPath = projectPath;
const existingOptions = {};
const parsed = ts.readConfigFile(projectPath, ts.sys.readFile);
if (parsed.error) {
throw parsed.error;
}
this._cmdLine = ts.parseJsonConfigFileContent(parsed.config, ts.sys, path.dirname(projectPath), existingOptions);
if (this._cmdLine.errors.length > 0) {
throw parsed.error;
}
}
getCompilationSettings() {
return this._cmdLine.options;
}
getScriptFileNames() {
return this._cmdLine.fileNames;
}
getScriptVersion(_fileName) {
return '1';
}
getProjectVersion() {
return '1';
}
getScriptSnapshot(fileName) {
let result = this._scriptSnapshots.get(fileName);
if (result === undefined) {
const content = ts.sys.readFile(fileName);
if (content === undefined) {
return undefined;
}
result = ts.ScriptSnapshot.fromString(content);
this._scriptSnapshots.set(fileName, result);
}
return result;
}
getCurrentDirectory() {
return path.dirname(this.projectPath);
}
getDefaultLibFileName(options) {
return ts.getDefaultLibFilePath(options);
}
directoryExists = ts.sys.directoryExists;
getDirectories = ts.sys.getDirectories;
fileExists = ts.sys.fileExists;
readFile = ts.sys.readFile;
readDirectory = ts.sys.readDirectory;
// this is necessary to make source references work.
realpath = ts.sys.realpath;
}
/**
* TypeScript2TypeScript transformer that mangles all private and protected fields
*
* 1. Collect all class fields (properties, methods)
* 2. Collect all sub and super-type relations between classes
* 3. Compute replacement names for each field
* 4. Lookup rename locations for these fields
* 5. Prepare and apply edits
*/
class Mangler {
projectPath;
log;
allClassDataByKey = new Map();
service;
constructor(projectPath, log = () => { }) {
this.projectPath = projectPath;
this.log = log;
this.service = ts.createLanguageService(new StaticLanguageServiceHost(projectPath));
}
computeNewFileContents() {
// STEP: find all classes and their field info
const visit = (node) => {
if (ts.isClassDeclaration(node) || ts.isClassExpression(node)) {
const anchor = node.name ?? node;
const key = `${node.getSourceFile().fileName}|${anchor.getStart()}`;
if (this.allClassDataByKey.has(key)) {
throw new Error('DUPE?');
}
this.allClassDataByKey.set(key, new ClassData(node.getSourceFile().fileName, node));
}
ts.forEachChild(node, visit);
};
for (const file of this.service.getProgram().getSourceFiles()) {
if (!file.isDeclarationFile) {
ts.forEachChild(file, visit);
}
}
this.log(`done COLLECTING ${this.allClassDataByKey.size} classes`);
// STEP: connect sub and super-types
const setupParents = (data) => {
const extendsClause = data.node.heritageClauses?.find(h => h.token === ts.SyntaxKind.ExtendsKeyword);
if (!extendsClause) {
// no EXTENDS-clause
return;
}
const info = this.service.getDefinitionAtPosition(data.fileName, extendsClause.types[0].expression.getEnd());
if (!info || info.length === 0) {
// throw new Error('SUPER type not found');
return;
}
if (info.length !== 1) {
// inherits from declared/library type
return;
}
const [definition] = info;
const key = `${definition.fileName}|${definition.textSpan.start}`;
const parent = this.allClassDataByKey.get(key);
if (!parent) {
// throw new Error(`SUPER type not found: ${key}`);
return;
}
parent.addChild(data);
};
for (const data of this.allClassDataByKey.values()) {
setupParents(data);
}
// STEP: make implicit public (actually protected) field really public
const violations = new Map();
for (const data of this.allClassDataByKey.values()) {
ClassData.makeImplicitPublicActuallyPublic(data, (what, why) => {
const arr = violations.get(what);
if (arr) {
arr.push(why);
}
else {
violations.set(what, [why]);
}
});
}
for (const [why, whys] of violations) {
this.log(`WARN: ${why} became PUBLIC because of: ${whys.join(' , ')}`);
}
// STEP: compute replacement names for each class
for (const data of this.allClassDataByKey.values()) {
ClassData.fillInReplacement(data);
}
this.log(`done creating REPLACEMENTS`);
const editsByFile = new Map();
const appendEdit = (fileName, edit) => {
const edits = editsByFile.get(fileName);
if (!edits) {
editsByFile.set(fileName, [edit]);
}
else {
edits.push(edit);
}
};
for (const data of this.allClassDataByKey.values()) {
if (hasModifier(data.node, ts.SyntaxKind.DeclareKeyword)) {
continue;
}
fields: for (const [name, info] of data.fields) {
if (!ClassData._shouldMangle(info.type)) {
continue fields;
}
// TS-HACK: protected became public via 'some' child
// and because of that we might need to ignore this now
let parent = data.parent;
while (parent) {
if (parent.fields.get(name)?.type === 0 /* FieldType.Public */) {
continue fields;
}
parent = parent.parent;
}
const newText = data.lookupShortName(name);
const locations = this.service.findRenameLocations(data.fileName, info.pos, false, false, true) ?? [];
for (const loc of locations) {
appendEdit(loc.fileName, {
newText: (loc.prefixText || '') + newText + (loc.suffixText || ''),
offset: loc.textSpan.start,
length: loc.textSpan.length
});
}
}
}
this.log(`done preparing EDITS for ${editsByFile.size} files`);
// STEP: apply all rename edits (per file)
const result = new Map();
let savedBytes = 0;
for (const item of this.service.getProgram().getSourceFiles()) {
let newFullText;
const edits = editsByFile.get(item.fileName);
if (!edits) {
// just copy
newFullText = item.getFullText();
}
else {
// apply renames
edits.sort((a, b) => b.offset - a.offset);
const characters = item.getFullText().split('');
let lastEdit;
for (const edit of edits) {
if (lastEdit) {
if (lastEdit.offset === edit.offset) {
//
if (lastEdit.length !== edit.length || lastEdit.newText !== edit.newText) {
this.log('OVERLAPPING edit', item.fileName, edit.offset, edits);
throw new Error('OVERLAPPING edit');
}
else {
continue;
}
}
}
lastEdit = edit;
const removed = characters.splice(edit.offset, edit.length, edit.newText);
savedBytes += removed.length - edit.newText.length;
}
newFullText = characters.join('');
}
result.set(item.fileName, newFullText);
}
this.log(`DONE saved ${savedBytes / 1000}kb`);
return result;
}
}
exports.Mangler = Mangler;
// --- ast utils
function hasModifier(node, kind) {
const modifiers = ts.canHaveModifiers(node) ? ts.getModifiers(node) : undefined;
return Boolean(modifiers?.find(mode => mode.kind === kind));
}
async function _run() {
const projectPath = path.join(__dirname, '../../src/tsconfig.json');
const projectBase = path.dirname(projectPath);
const newProjectBase = path.join(path.dirname(projectBase), path.basename(projectBase) + '-mangle');
for await (const [fileName, contents] of new Mangler(projectPath, console.log).computeNewFileContents()) {
const newFilePath = path.join(newProjectBase, path.relative(projectBase, fileName));
await fs.promises.mkdir(path.dirname(newFilePath), { recursive: true });
await fs.promises.writeFile(newFilePath, contents);
}
}
if (__filename === process_1.argv[1]) {
_run();
}
//# 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