892 lines
22 KiB
JavaScript
892 lines
22 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = void 0;
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function _includes() {
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const data = _interopRequireDefault(require("lodash/includes"));
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_includes = function () {
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return data;
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};
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return data;
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}
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function _repeat() {
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const data = _interopRequireDefault(require("lodash/repeat"));
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_repeat = function () {
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return data;
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};
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return data;
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}
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var _renamer = _interopRequireDefault(require("./lib/renamer"));
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var _index = _interopRequireDefault(require("../index"));
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function _defaults() {
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const data = _interopRequireDefault(require("lodash/defaults"));
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_defaults = function () {
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return data;
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};
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return data;
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}
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var _binding = _interopRequireDefault(require("./binding"));
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function _globals() {
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const data = _interopRequireDefault(require("globals"));
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_globals = function () {
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return data;
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};
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return data;
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}
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function t() {
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const data = _interopRequireWildcard(require("@babel/types"));
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t = function () {
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return data;
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};
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return data;
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}
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var _cache = require("../cache");
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function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } else { var newObj = {}; if (obj != null) { for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = Object.defineProperty && Object.getOwnPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : {}; if (desc.get || desc.set) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } } newObj.default = obj; return newObj; } }
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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function gatherNodeParts(node, parts) {
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if (t().isModuleDeclaration(node)) {
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if (node.source) {
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gatherNodeParts(node.source, parts);
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} else if (node.specifiers && node.specifiers.length) {
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for (const specifier of node.specifiers) {
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gatherNodeParts(specifier, parts);
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}
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} else if (node.declaration) {
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gatherNodeParts(node.declaration, parts);
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}
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} else if (t().isModuleSpecifier(node)) {
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gatherNodeParts(node.local, parts);
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} else if (t().isMemberExpression(node)) {
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gatherNodeParts(node.object, parts);
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gatherNodeParts(node.property, parts);
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} else if (t().isIdentifier(node)) {
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parts.push(node.name);
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} else if (t().isLiteral(node)) {
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parts.push(node.value);
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} else if (t().isCallExpression(node)) {
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gatherNodeParts(node.callee, parts);
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} else if (t().isObjectExpression(node) || t().isObjectPattern(node)) {
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for (const prop of node.properties) {
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gatherNodeParts(prop.key || prop.argument, parts);
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}
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} else if (t().isPrivateName(node)) {
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gatherNodeParts(node.id, parts);
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} else if (t().isThisExpression(node)) {
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parts.push("this");
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} else if (t().isSuper(node)) {
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parts.push("super");
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}
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}
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const collectorVisitor = {
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For(path) {
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for (const key of t().FOR_INIT_KEYS) {
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const declar = path.get(key);
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if (declar.isVar()) {
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const parentScope = path.scope.getFunctionParent() || path.scope.getProgramParent();
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parentScope.registerBinding("var", declar);
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}
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}
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},
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Declaration(path) {
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if (path.isBlockScoped()) return;
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if (path.isExportDeclaration() && path.get("declaration").isDeclaration()) {
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return;
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}
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const parent = path.scope.getFunctionParent() || path.scope.getProgramParent();
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parent.registerDeclaration(path);
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},
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ReferencedIdentifier(path, state) {
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state.references.push(path);
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},
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ForXStatement(path, state) {
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const left = path.get("left");
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if (left.isPattern() || left.isIdentifier()) {
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state.constantViolations.push(path);
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}
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},
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ExportDeclaration: {
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exit(path) {
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const {
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node,
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scope
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} = path;
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const declar = node.declaration;
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if (t().isClassDeclaration(declar) || t().isFunctionDeclaration(declar)) {
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const id = declar.id;
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if (!id) return;
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const binding = scope.getBinding(id.name);
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if (binding) binding.reference(path);
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} else if (t().isVariableDeclaration(declar)) {
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for (const decl of declar.declarations) {
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for (const name of Object.keys(t().getBindingIdentifiers(decl))) {
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const binding = scope.getBinding(name);
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if (binding) binding.reference(path);
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}
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}
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}
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}
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},
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LabeledStatement(path) {
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path.scope.getProgramParent().addGlobal(path.node);
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path.scope.getBlockParent().registerDeclaration(path);
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},
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AssignmentExpression(path, state) {
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state.assignments.push(path);
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},
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UpdateExpression(path, state) {
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state.constantViolations.push(path);
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},
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UnaryExpression(path, state) {
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if (path.node.operator === "delete") {
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state.constantViolations.push(path);
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}
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},
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BlockScoped(path) {
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let scope = path.scope;
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if (scope.path === path) scope = scope.parent;
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scope.getBlockParent().registerDeclaration(path);
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},
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ClassDeclaration(path) {
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const id = path.node.id;
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if (!id) return;
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const name = id.name;
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path.scope.bindings[name] = path.scope.getBinding(name);
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},
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Block(path) {
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const paths = path.get("body");
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for (const bodyPath of paths) {
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if (bodyPath.isFunctionDeclaration()) {
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path.scope.getBlockParent().registerDeclaration(bodyPath);
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}
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}
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}
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};
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let uid = 0;
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class Scope {
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constructor(path) {
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const {
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node
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} = path;
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const cached = _cache.scope.get(node);
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if (cached && cached.path === path) {
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return cached;
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}
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_cache.scope.set(node, this);
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this.uid = uid++;
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this.block = node;
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this.path = path;
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this.labels = new Map();
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}
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get parent() {
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const parent = this.path.findParent(p => p.isScope());
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return parent && parent.scope;
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}
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get parentBlock() {
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return this.path.parent;
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}
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get hub() {
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return this.path.hub;
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}
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traverse(node, opts, state) {
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(0, _index.default)(node, opts, this, state, this.path);
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}
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generateDeclaredUidIdentifier(name) {
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const id = this.generateUidIdentifier(name);
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this.push({
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id
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});
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return t().cloneNode(id);
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}
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generateUidIdentifier(name) {
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return t().identifier(this.generateUid(name));
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}
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generateUid(name = "temp") {
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name = t().toIdentifier(name).replace(/^_+/, "").replace(/[0-9]+$/g, "");
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let uid;
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let i = 0;
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do {
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uid = this._generateUid(name, i);
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i++;
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} while (this.hasLabel(uid) || this.hasBinding(uid) || this.hasGlobal(uid) || this.hasReference(uid));
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const program = this.getProgramParent();
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program.references[uid] = true;
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program.uids[uid] = true;
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return uid;
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}
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_generateUid(name, i) {
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let id = name;
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if (i > 1) id += i;
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return `_${id}`;
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}
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generateUidBasedOnNode(parent, defaultName) {
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let node = parent;
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if (t().isAssignmentExpression(parent)) {
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node = parent.left;
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} else if (t().isVariableDeclarator(parent)) {
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node = parent.id;
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} else if (t().isObjectProperty(node) || t().isObjectMethod(node)) {
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node = node.key;
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}
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const parts = [];
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gatherNodeParts(node, parts);
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let id = parts.join("$");
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id = id.replace(/^_/, "") || defaultName || "ref";
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return this.generateUid(id.slice(0, 20));
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}
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generateUidIdentifierBasedOnNode(parent, defaultName) {
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return t().identifier(this.generateUidBasedOnNode(parent, defaultName));
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}
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isStatic(node) {
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if (t().isThisExpression(node) || t().isSuper(node)) {
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return true;
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}
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if (t().isIdentifier(node)) {
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const binding = this.getBinding(node.name);
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if (binding) {
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return binding.constant;
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} else {
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return this.hasBinding(node.name);
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}
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}
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return false;
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}
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maybeGenerateMemoised(node, dontPush) {
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if (this.isStatic(node)) {
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return null;
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} else {
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const id = this.generateUidIdentifierBasedOnNode(node);
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if (!dontPush) {
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this.push({
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id
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});
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return t().cloneNode(id);
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}
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return id;
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}
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}
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checkBlockScopedCollisions(local, kind, name, id) {
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if (kind === "param") return;
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if (local.kind === "local") return;
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const duplicate = kind === "let" || local.kind === "let" || local.kind === "const" || local.kind === "module" || local.kind === "param" && (kind === "let" || kind === "const");
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if (duplicate) {
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throw this.hub.buildError(id, `Duplicate declaration "${name}"`, TypeError);
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}
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}
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rename(oldName, newName, block) {
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const binding = this.getBinding(oldName);
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if (binding) {
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newName = newName || this.generateUidIdentifier(oldName).name;
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return new _renamer.default(binding, oldName, newName).rename(block);
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}
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}
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_renameFromMap(map, oldName, newName, value) {
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if (map[oldName]) {
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map[newName] = value;
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map[oldName] = null;
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}
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}
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dump() {
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const sep = (0, _repeat().default)("-", 60);
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console.log(sep);
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let scope = this;
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do {
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console.log("#", scope.block.type);
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for (const name of Object.keys(scope.bindings)) {
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const binding = scope.bindings[name];
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console.log(" -", name, {
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constant: binding.constant,
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references: binding.references,
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violations: binding.constantViolations.length,
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kind: binding.kind
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});
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}
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} while (scope = scope.parent);
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console.log(sep);
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}
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toArray(node, i) {
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if (t().isIdentifier(node)) {
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const binding = this.getBinding(node.name);
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if (binding && binding.constant && binding.path.isGenericType("Array")) {
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return node;
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}
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}
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if (t().isArrayExpression(node)) {
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return node;
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}
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if (t().isIdentifier(node, {
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name: "arguments"
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})) {
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return t().callExpression(t().memberExpression(t().memberExpression(t().memberExpression(t().identifier("Array"), t().identifier("prototype")), t().identifier("slice")), t().identifier("call")), [node]);
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}
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let helperName;
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const args = [node];
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if (i === true) {
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helperName = "toConsumableArray";
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} else if (i) {
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args.push(t().numericLiteral(i));
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helperName = "slicedToArray";
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} else {
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helperName = "toArray";
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}
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return t().callExpression(this.hub.addHelper(helperName), args);
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}
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hasLabel(name) {
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return !!this.getLabel(name);
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}
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getLabel(name) {
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return this.labels.get(name);
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}
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registerLabel(path) {
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this.labels.set(path.node.label.name, path);
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}
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registerDeclaration(path) {
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if (path.isLabeledStatement()) {
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this.registerLabel(path);
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} else if (path.isFunctionDeclaration()) {
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this.registerBinding("hoisted", path.get("id"), path);
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} else if (path.isVariableDeclaration()) {
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const declarations = path.get("declarations");
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for (const declar of declarations) {
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this.registerBinding(path.node.kind, declar);
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}
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} else if (path.isClassDeclaration()) {
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this.registerBinding("let", path);
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} else if (path.isImportDeclaration()) {
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const specifiers = path.get("specifiers");
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for (const specifier of specifiers) {
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this.registerBinding("module", specifier);
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}
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} else if (path.isExportDeclaration()) {
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const declar = path.get("declaration");
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if (declar.isClassDeclaration() || declar.isFunctionDeclaration() || declar.isVariableDeclaration()) {
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this.registerDeclaration(declar);
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}
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} else {
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this.registerBinding("unknown", path);
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}
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}
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buildUndefinedNode() {
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if (this.hasBinding("undefined")) {
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return t().unaryExpression("void", t().numericLiteral(0), true);
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} else {
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return t().identifier("undefined");
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}
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}
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registerConstantViolation(path) {
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const ids = path.getBindingIdentifiers();
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for (const name of Object.keys(ids)) {
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const binding = this.getBinding(name);
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if (binding) binding.reassign(path);
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}
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}
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registerBinding(kind, path, bindingPath = path) {
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if (!kind) throw new ReferenceError("no `kind`");
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if (path.isVariableDeclaration()) {
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const declarators = path.get("declarations");
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for (const declar of declarators) {
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this.registerBinding(kind, declar);
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}
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return;
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}
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const parent = this.getProgramParent();
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const ids = path.getOuterBindingIdentifiers(true);
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for (const name of Object.keys(ids)) {
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for (const id of ids[name]) {
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const local = this.getOwnBinding(name);
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if (local) {
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if (local.identifier === id) continue;
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this.checkBlockScopedCollisions(local, kind, name, id);
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}
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parent.references[name] = true;
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if (local) {
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this.registerConstantViolation(bindingPath);
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} else {
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this.bindings[name] = new _binding.default({
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identifier: id,
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scope: this,
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path: bindingPath,
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kind: kind
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});
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}
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}
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}
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}
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addGlobal(node) {
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this.globals[node.name] = node;
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}
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hasUid(name) {
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let scope = this;
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do {
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if (scope.uids[name]) return true;
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} while (scope = scope.parent);
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return false;
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}
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hasGlobal(name) {
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let scope = this;
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do {
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if (scope.globals[name]) return true;
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} while (scope = scope.parent);
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return false;
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}
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hasReference(name) {
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let scope = this;
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do {
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if (scope.references[name]) return true;
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} while (scope = scope.parent);
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return false;
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}
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isPure(node, constantsOnly) {
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if (t().isIdentifier(node)) {
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const binding = this.getBinding(node.name);
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if (!binding) return false;
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if (constantsOnly) return binding.constant;
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return true;
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} else if (t().isClass(node)) {
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if (node.superClass && !this.isPure(node.superClass, constantsOnly)) {
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return false;
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}
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return this.isPure(node.body, constantsOnly);
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} else if (t().isClassBody(node)) {
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for (const method of node.body) {
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if (!this.isPure(method, constantsOnly)) return false;
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}
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return true;
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} else if (t().isBinary(node)) {
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return this.isPure(node.left, constantsOnly) && this.isPure(node.right, constantsOnly);
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} else if (t().isArrayExpression(node)) {
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for (const elem of node.elements) {
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if (!this.isPure(elem, constantsOnly)) return false;
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}
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return true;
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} else if (t().isObjectExpression(node)) {
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for (const prop of node.properties) {
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if (!this.isPure(prop, constantsOnly)) return false;
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}
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return true;
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} else if (t().isClassMethod(node)) {
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if (node.computed && !this.isPure(node.key, constantsOnly)) return false;
|
|
if (node.kind === "get" || node.kind === "set") return false;
|
|
return true;
|
|
} else if (t().isProperty(node)) {
|
|
if (node.computed && !this.isPure(node.key, constantsOnly)) return false;
|
|
return this.isPure(node.value, constantsOnly);
|
|
} else if (t().isUnaryExpression(node)) {
|
|
return this.isPure(node.argument, constantsOnly);
|
|
} else if (t().isTaggedTemplateExpression(node)) {
|
|
return t().matchesPattern(node.tag, "String.raw") && !this.hasBinding("String", true) && this.isPure(node.quasi, constantsOnly);
|
|
} else if (t().isTemplateLiteral(node)) {
|
|
for (const expression of node.expressions) {
|
|
if (!this.isPure(expression, constantsOnly)) return false;
|
|
}
|
|
|
|
return true;
|
|
} else {
|
|
return t().isPureish(node);
|
|
}
|
|
}
|
|
|
|
setData(key, val) {
|
|
return this.data[key] = val;
|
|
}
|
|
|
|
getData(key) {
|
|
let scope = this;
|
|
|
|
do {
|
|
const data = scope.data[key];
|
|
if (data != null) return data;
|
|
} while (scope = scope.parent);
|
|
}
|
|
|
|
removeData(key) {
|
|
let scope = this;
|
|
|
|
do {
|
|
const data = scope.data[key];
|
|
if (data != null) scope.data[key] = null;
|
|
} while (scope = scope.parent);
|
|
}
|
|
|
|
init() {
|
|
if (!this.references) this.crawl();
|
|
}
|
|
|
|
crawl() {
|
|
const path = this.path;
|
|
this.references = Object.create(null);
|
|
this.bindings = Object.create(null);
|
|
this.globals = Object.create(null);
|
|
this.uids = Object.create(null);
|
|
this.data = Object.create(null);
|
|
|
|
if (path.isLoop()) {
|
|
for (const key of t().FOR_INIT_KEYS) {
|
|
const node = path.get(key);
|
|
if (node.isBlockScoped()) this.registerBinding(node.node.kind, node);
|
|
}
|
|
}
|
|
|
|
if (path.isFunctionExpression() && path.has("id")) {
|
|
if (!path.get("id").node[t().NOT_LOCAL_BINDING]) {
|
|
this.registerBinding("local", path.get("id"), path);
|
|
}
|
|
}
|
|
|
|
if (path.isClassExpression() && path.has("id")) {
|
|
if (!path.get("id").node[t().NOT_LOCAL_BINDING]) {
|
|
this.registerBinding("local", path);
|
|
}
|
|
}
|
|
|
|
if (path.isFunction()) {
|
|
const params = path.get("params");
|
|
|
|
for (const param of params) {
|
|
this.registerBinding("param", param);
|
|
}
|
|
}
|
|
|
|
if (path.isCatchClause()) {
|
|
this.registerBinding("let", path);
|
|
}
|
|
|
|
const parent = this.getProgramParent();
|
|
if (parent.crawling) return;
|
|
const state = {
|
|
references: [],
|
|
constantViolations: [],
|
|
assignments: []
|
|
};
|
|
this.crawling = true;
|
|
path.traverse(collectorVisitor, state);
|
|
this.crawling = false;
|
|
|
|
for (const path of state.assignments) {
|
|
const ids = path.getBindingIdentifiers();
|
|
let programParent;
|
|
|
|
for (const name of Object.keys(ids)) {
|
|
if (path.scope.getBinding(name)) continue;
|
|
programParent = programParent || path.scope.getProgramParent();
|
|
programParent.addGlobal(ids[name]);
|
|
}
|
|
|
|
path.scope.registerConstantViolation(path);
|
|
}
|
|
|
|
for (const ref of state.references) {
|
|
const binding = ref.scope.getBinding(ref.node.name);
|
|
|
|
if (binding) {
|
|
binding.reference(ref);
|
|
} else {
|
|
ref.scope.getProgramParent().addGlobal(ref.node);
|
|
}
|
|
}
|
|
|
|
for (const path of state.constantViolations) {
|
|
path.scope.registerConstantViolation(path);
|
|
}
|
|
}
|
|
|
|
push(opts) {
|
|
let path = this.path;
|
|
|
|
if (!path.isBlockStatement() && !path.isProgram()) {
|
|
path = this.getBlockParent().path;
|
|
}
|
|
|
|
if (path.isSwitchStatement()) {
|
|
path = (this.getFunctionParent() || this.getProgramParent()).path;
|
|
}
|
|
|
|
if (path.isLoop() || path.isCatchClause() || path.isFunction()) {
|
|
path.ensureBlock();
|
|
path = path.get("body");
|
|
}
|
|
|
|
const unique = opts.unique;
|
|
const kind = opts.kind || "var";
|
|
const blockHoist = opts._blockHoist == null ? 2 : opts._blockHoist;
|
|
const dataKey = `declaration:${kind}:${blockHoist}`;
|
|
let declarPath = !unique && path.getData(dataKey);
|
|
|
|
if (!declarPath) {
|
|
const declar = t().variableDeclaration(kind, []);
|
|
declar._blockHoist = blockHoist;
|
|
[declarPath] = path.unshiftContainer("body", [declar]);
|
|
if (!unique) path.setData(dataKey, declarPath);
|
|
}
|
|
|
|
const declarator = t().variableDeclarator(opts.id, opts.init);
|
|
declarPath.node.declarations.push(declarator);
|
|
this.registerBinding(kind, declarPath.get("declarations").pop());
|
|
}
|
|
|
|
getProgramParent() {
|
|
let scope = this;
|
|
|
|
do {
|
|
if (scope.path.isProgram()) {
|
|
return scope;
|
|
}
|
|
} while (scope = scope.parent);
|
|
|
|
throw new Error("Couldn't find a Program");
|
|
}
|
|
|
|
getFunctionParent() {
|
|
let scope = this;
|
|
|
|
do {
|
|
if (scope.path.isFunctionParent()) {
|
|
return scope;
|
|
}
|
|
} while (scope = scope.parent);
|
|
|
|
return null;
|
|
}
|
|
|
|
getBlockParent() {
|
|
let scope = this;
|
|
|
|
do {
|
|
if (scope.path.isBlockParent()) {
|
|
return scope;
|
|
}
|
|
} while (scope = scope.parent);
|
|
|
|
throw new Error("We couldn't find a BlockStatement, For, Switch, Function, Loop or Program...");
|
|
}
|
|
|
|
getAllBindings() {
|
|
const ids = Object.create(null);
|
|
let scope = this;
|
|
|
|
do {
|
|
(0, _defaults().default)(ids, scope.bindings);
|
|
scope = scope.parent;
|
|
} while (scope);
|
|
|
|
return ids;
|
|
}
|
|
|
|
getAllBindingsOfKind() {
|
|
const ids = Object.create(null);
|
|
|
|
for (const kind of arguments) {
|
|
let scope = this;
|
|
|
|
do {
|
|
for (const name of Object.keys(scope.bindings)) {
|
|
const binding = scope.bindings[name];
|
|
if (binding.kind === kind) ids[name] = binding;
|
|
}
|
|
|
|
scope = scope.parent;
|
|
} while (scope);
|
|
}
|
|
|
|
return ids;
|
|
}
|
|
|
|
bindingIdentifierEquals(name, node) {
|
|
return this.getBindingIdentifier(name) === node;
|
|
}
|
|
|
|
getBinding(name) {
|
|
let scope = this;
|
|
|
|
do {
|
|
const binding = scope.getOwnBinding(name);
|
|
if (binding) return binding;
|
|
} while (scope = scope.parent);
|
|
}
|
|
|
|
getOwnBinding(name) {
|
|
return this.bindings[name];
|
|
}
|
|
|
|
getBindingIdentifier(name) {
|
|
const info = this.getBinding(name);
|
|
return info && info.identifier;
|
|
}
|
|
|
|
getOwnBindingIdentifier(name) {
|
|
const binding = this.bindings[name];
|
|
return binding && binding.identifier;
|
|
}
|
|
|
|
hasOwnBinding(name) {
|
|
return !!this.getOwnBinding(name);
|
|
}
|
|
|
|
hasBinding(name, noGlobals) {
|
|
if (!name) return false;
|
|
if (this.hasOwnBinding(name)) return true;
|
|
if (this.parentHasBinding(name, noGlobals)) return true;
|
|
if (this.hasUid(name)) return true;
|
|
if (!noGlobals && (0, _includes().default)(Scope.globals, name)) return true;
|
|
if (!noGlobals && (0, _includes().default)(Scope.contextVariables, name)) return true;
|
|
return false;
|
|
}
|
|
|
|
parentHasBinding(name, noGlobals) {
|
|
return this.parent && this.parent.hasBinding(name, noGlobals);
|
|
}
|
|
|
|
moveBindingTo(name, scope) {
|
|
const info = this.getBinding(name);
|
|
|
|
if (info) {
|
|
info.scope.removeOwnBinding(name);
|
|
info.scope = scope;
|
|
scope.bindings[name] = info;
|
|
}
|
|
}
|
|
|
|
removeOwnBinding(name) {
|
|
delete this.bindings[name];
|
|
}
|
|
|
|
removeBinding(name) {
|
|
const info = this.getBinding(name);
|
|
|
|
if (info) {
|
|
info.scope.removeOwnBinding(name);
|
|
}
|
|
|
|
let scope = this;
|
|
|
|
do {
|
|
if (scope.uids[name]) {
|
|
scope.uids[name] = false;
|
|
}
|
|
} while (scope = scope.parent);
|
|
}
|
|
|
|
}
|
|
|
|
exports.default = Scope;
|
|
Scope.globals = Object.keys(_globals().default.builtin);
|
|
Scope.contextVariables = ["arguments", "undefined", "Infinity", "NaN"]; |