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732 lines
20 KiB
732 lines
20 KiB
"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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var _helperPluginUtils = require("@babel/helper-plugin-utils");
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var _tdz = require("./tdz");
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var _values = _interopRequireDefault(require("lodash/values"));
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var _extend = _interopRequireDefault(require("lodash/extend"));
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var _core = require("@babel/core");
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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const DONE = new WeakSet();
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var _default = (0, _helperPluginUtils.declare)((api, opts) => {
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api.assertVersion(7);
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const {
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throwIfClosureRequired = false,
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tdz: tdzEnabled = false
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} = opts;
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if (typeof throwIfClosureRequired !== "boolean") {
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throw new Error(`.throwIfClosureRequired must be a boolean, or undefined`);
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}
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if (typeof tdzEnabled !== "boolean") {
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throw new Error(`.tdz must be a boolean, or undefined`);
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}
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return {
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name: "transform-block-scoping",
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visitor: {
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VariableDeclaration(path) {
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const {
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node,
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parent,
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scope
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} = path;
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if (!isBlockScoped(node)) return;
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convertBlockScopedToVar(path, null, parent, scope, true);
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if (node._tdzThis) {
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const nodes = [node];
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for (let i = 0; i < node.declarations.length; i++) {
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const decl = node.declarations[i];
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const assign = _core.types.assignmentExpression("=", decl.id, decl.init || scope.buildUndefinedNode());
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assign._ignoreBlockScopingTDZ = true;
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nodes.push(_core.types.expressionStatement(assign));
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decl.init = this.addHelper("temporalUndefined");
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}
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node._blockHoist = 2;
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if (path.isCompletionRecord()) {
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nodes.push(_core.types.expressionStatement(scope.buildUndefinedNode()));
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}
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path.replaceWithMultiple(nodes);
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}
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},
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Loop(path, state) {
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const {
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parent,
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scope
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} = path;
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path.ensureBlock();
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const blockScoping = new BlockScoping(path, path.get("body"), parent, scope, throwIfClosureRequired, tdzEnabled, state);
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const replace = blockScoping.run();
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if (replace) path.replaceWith(replace);
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},
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CatchClause(path, state) {
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const {
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parent,
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scope
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} = path;
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const blockScoping = new BlockScoping(null, path.get("body"), parent, scope, throwIfClosureRequired, tdzEnabled, state);
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blockScoping.run();
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},
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"BlockStatement|SwitchStatement|Program"(path, state) {
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if (!ignoreBlock(path)) {
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const blockScoping = new BlockScoping(null, path, path.parent, path.scope, throwIfClosureRequired, tdzEnabled, state);
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blockScoping.run();
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}
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}
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}
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};
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});
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exports.default = _default;
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function ignoreBlock(path) {
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return _core.types.isLoop(path.parent) || _core.types.isCatchClause(path.parent);
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}
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const buildRetCheck = (0, _core.template)(`
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if (typeof RETURN === "object") return RETURN.v;
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`);
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function isBlockScoped(node) {
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if (!_core.types.isVariableDeclaration(node)) return false;
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if (node[_core.types.BLOCK_SCOPED_SYMBOL]) return true;
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if (node.kind !== "let" && node.kind !== "const") return false;
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return true;
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}
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function isInLoop(path) {
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const loopOrFunctionParent = path.find(path => path.isLoop() || path.isFunction());
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return loopOrFunctionParent && loopOrFunctionParent.isLoop();
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}
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function convertBlockScopedToVar(path, node, parent, scope, moveBindingsToParent = false) {
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if (!node) {
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node = path.node;
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}
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if (isInLoop(path) && !_core.types.isFor(parent)) {
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for (let i = 0; i < node.declarations.length; i++) {
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const declar = node.declarations[i];
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declar.init = declar.init || scope.buildUndefinedNode();
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}
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}
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node[_core.types.BLOCK_SCOPED_SYMBOL] = true;
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node.kind = "var";
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if (moveBindingsToParent) {
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const parentScope = scope.getFunctionParent() || scope.getProgramParent();
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for (const name of Object.keys(path.getBindingIdentifiers())) {
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const binding = scope.getOwnBinding(name);
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if (binding) binding.kind = "var";
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scope.moveBindingTo(name, parentScope);
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}
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}
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}
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function isVar(node) {
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return _core.types.isVariableDeclaration(node, {
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kind: "var"
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}) && !isBlockScoped(node);
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}
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const letReferenceBlockVisitor = _core.traverse.visitors.merge([{
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Loop: {
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enter(path, state) {
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state.loopDepth++;
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},
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exit(path, state) {
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state.loopDepth--;
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}
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},
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Function(path, state) {
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if (state.loopDepth > 0) {
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path.traverse(letReferenceFunctionVisitor, state);
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} else {
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path.traverse(_tdz.visitor, state);
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}
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return path.skip();
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}
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}, _tdz.visitor]);
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const letReferenceFunctionVisitor = _core.traverse.visitors.merge([{
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ReferencedIdentifier(path, state) {
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const ref = state.letReferences[path.node.name];
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if (!ref) return;
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const localBinding = path.scope.getBindingIdentifier(path.node.name);
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if (localBinding && localBinding !== ref) return;
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state.closurify = true;
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}
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}, _tdz.visitor]);
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const hoistVarDeclarationsVisitor = {
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enter(path, self) {
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const {
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node,
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parent
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} = path;
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if (path.isForStatement()) {
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if (isVar(node.init, node)) {
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const nodes = self.pushDeclar(node.init);
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if (nodes.length === 1) {
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node.init = nodes[0];
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} else {
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node.init = _core.types.sequenceExpression(nodes);
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}
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}
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} else if (path.isFor()) {
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if (isVar(node.left, node)) {
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self.pushDeclar(node.left);
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node.left = node.left.declarations[0].id;
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}
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} else if (isVar(node, parent)) {
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path.replaceWithMultiple(self.pushDeclar(node).map(expr => _core.types.expressionStatement(expr)));
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} else if (path.isFunction()) {
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return path.skip();
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}
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}
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};
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const loopLabelVisitor = {
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LabeledStatement({
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node
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}, state) {
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state.innerLabels.push(node.label.name);
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}
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};
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const continuationVisitor = {
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enter(path, state) {
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if (path.isAssignmentExpression() || path.isUpdateExpression()) {
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for (const name of Object.keys(path.getBindingIdentifiers())) {
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if (state.outsideReferences[name] !== path.scope.getBindingIdentifier(name)) {
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continue;
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}
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state.reassignments[name] = true;
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}
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} else if (path.isReturnStatement()) {
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state.returnStatements.push(path);
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}
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}
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};
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function loopNodeTo(node) {
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if (_core.types.isBreakStatement(node)) {
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return "break";
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} else if (_core.types.isContinueStatement(node)) {
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return "continue";
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}
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}
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const loopVisitor = {
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Loop(path, state) {
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const oldIgnoreLabeless = state.ignoreLabeless;
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state.ignoreLabeless = true;
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path.traverse(loopVisitor, state);
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state.ignoreLabeless = oldIgnoreLabeless;
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path.skip();
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},
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Function(path) {
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path.skip();
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},
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SwitchCase(path, state) {
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const oldInSwitchCase = state.inSwitchCase;
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state.inSwitchCase = true;
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path.traverse(loopVisitor, state);
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state.inSwitchCase = oldInSwitchCase;
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path.skip();
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},
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"BreakStatement|ContinueStatement|ReturnStatement"(path, state) {
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const {
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node,
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scope
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} = path;
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if (node[this.LOOP_IGNORE]) return;
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let replace;
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let loopText = loopNodeTo(node);
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if (loopText) {
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if (node.label) {
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if (state.innerLabels.indexOf(node.label.name) >= 0) {
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return;
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}
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loopText = `${loopText}|${node.label.name}`;
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} else {
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if (state.ignoreLabeless) return;
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if (_core.types.isBreakStatement(node) && state.inSwitchCase) return;
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}
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state.hasBreakContinue = true;
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state.map[loopText] = node;
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replace = _core.types.stringLiteral(loopText);
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}
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if (path.isReturnStatement()) {
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state.hasReturn = true;
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replace = _core.types.objectExpression([_core.types.objectProperty(_core.types.identifier("v"), node.argument || scope.buildUndefinedNode())]);
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}
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if (replace) {
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replace = _core.types.returnStatement(replace);
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replace[this.LOOP_IGNORE] = true;
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path.skip();
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path.replaceWith(_core.types.inherits(replace, node));
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}
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}
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};
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class BlockScoping {
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constructor(loopPath, blockPath, parent, scope, throwIfClosureRequired, tdzEnabled, state) {
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this.parent = parent;
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this.scope = scope;
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this.state = state;
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this.throwIfClosureRequired = throwIfClosureRequired;
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this.tdzEnabled = tdzEnabled;
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this.blockPath = blockPath;
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this.block = blockPath.node;
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this.outsideLetReferences = Object.create(null);
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this.hasLetReferences = false;
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this.letReferences = Object.create(null);
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this.body = [];
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if (loopPath) {
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this.loopParent = loopPath.parent;
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this.loopLabel = _core.types.isLabeledStatement(this.loopParent) && this.loopParent.label;
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this.loopPath = loopPath;
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this.loop = loopPath.node;
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}
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}
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run() {
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const block = this.block;
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if (DONE.has(block)) return;
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DONE.add(block);
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const needsClosure = this.getLetReferences();
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this.checkConstants();
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if (_core.types.isFunction(this.parent) || _core.types.isProgram(this.block)) {
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this.updateScopeInfo();
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return;
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}
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if (!this.hasLetReferences) return;
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if (needsClosure) {
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this.wrapClosure();
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} else {
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this.remap();
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}
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this.updateScopeInfo(needsClosure);
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if (this.loopLabel && !_core.types.isLabeledStatement(this.loopParent)) {
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return _core.types.labeledStatement(this.loopLabel, this.loop);
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}
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}
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checkConstants() {
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const scope = this.scope;
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const state = this.state;
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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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if (binding.kind !== "const") continue;
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for (const violation of binding.constantViolations) {
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const readOnlyError = state.addHelper("readOnlyError");
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const throwNode = _core.types.callExpression(readOnlyError, [_core.types.stringLiteral(name)]);
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if (violation.isAssignmentExpression()) {
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violation.get("right").replaceWith(_core.types.sequenceExpression([throwNode, violation.get("right").node]));
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} else if (violation.isUpdateExpression()) {
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violation.replaceWith(_core.types.sequenceExpression([throwNode, violation.node]));
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} else if (violation.isForXStatement()) {
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violation.ensureBlock();
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violation.node.body.body.unshift(_core.types.expressionStatement(throwNode));
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}
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}
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}
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}
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updateScopeInfo(wrappedInClosure) {
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const blockScope = this.blockPath.scope;
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const parentScope = blockScope.getFunctionParent() || blockScope.getProgramParent();
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const letRefs = this.letReferences;
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for (const key of Object.keys(letRefs)) {
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const ref = letRefs[key];
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const binding = blockScope.getBinding(ref.name);
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if (!binding) continue;
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if (binding.kind === "let" || binding.kind === "const") {
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binding.kind = "var";
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if (wrappedInClosure) {
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if (blockScope.hasOwnBinding(ref.name)) {
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blockScope.removeBinding(ref.name);
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}
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} else {
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blockScope.moveBindingTo(ref.name, parentScope);
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}
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}
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}
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}
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remap() {
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const letRefs = this.letReferences;
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const outsideLetRefs = this.outsideLetReferences;
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const scope = this.scope;
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const blockPathScope = this.blockPath.scope;
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for (const key of Object.keys(letRefs)) {
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const ref = letRefs[key];
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if (scope.parentHasBinding(key) || scope.hasGlobal(key)) {
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if (scope.hasOwnBinding(key)) {
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scope.rename(ref.name);
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}
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if (blockPathScope.hasOwnBinding(key)) {
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blockPathScope.rename(ref.name);
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}
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}
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}
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for (const key of Object.keys(outsideLetRefs)) {
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const ref = letRefs[key];
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if (isInLoop(this.blockPath) && blockPathScope.hasOwnBinding(key)) {
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blockPathScope.rename(ref.name);
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}
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}
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}
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wrapClosure() {
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if (this.throwIfClosureRequired) {
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throw this.blockPath.buildCodeFrameError("Compiling let/const in this block would add a closure " + "(throwIfClosureRequired).");
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}
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const block = this.block;
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const outsideRefs = this.outsideLetReferences;
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if (this.loop) {
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for (const name of Object.keys(outsideRefs)) {
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const id = outsideRefs[name];
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if (this.scope.hasGlobal(id.name) || this.scope.parentHasBinding(id.name)) {
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delete outsideRefs[id.name];
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delete this.letReferences[id.name];
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this.scope.rename(id.name);
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this.letReferences[id.name] = id;
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outsideRefs[id.name] = id;
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}
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}
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}
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this.has = this.checkLoop();
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this.hoistVarDeclarations();
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const args = (0, _values.default)(outsideRefs).map(id => _core.types.cloneNode(id));
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const params = args.map(id => _core.types.cloneNode(id));
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const isSwitch = this.blockPath.isSwitchStatement();
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const fn = _core.types.functionExpression(null, params, _core.types.blockStatement(isSwitch ? [block] : block.body));
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this.addContinuations(fn);
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let call = _core.types.callExpression(_core.types.nullLiteral(), args);
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let basePath = ".callee";
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const hasYield = _core.traverse.hasType(fn.body, "YieldExpression", _core.types.FUNCTION_TYPES);
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if (hasYield) {
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fn.generator = true;
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call = _core.types.yieldExpression(call, true);
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basePath = ".argument" + basePath;
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}
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const hasAsync = _core.traverse.hasType(fn.body, "AwaitExpression", _core.types.FUNCTION_TYPES);
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if (hasAsync) {
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fn.async = true;
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call = _core.types.awaitExpression(call);
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basePath = ".argument" + basePath;
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}
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let placeholderPath;
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let index;
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if (this.has.hasReturn || this.has.hasBreakContinue) {
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const ret = this.scope.generateUid("ret");
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this.body.push(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(_core.types.identifier(ret), call)]));
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placeholderPath = "declarations.0.init" + basePath;
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index = this.body.length - 1;
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this.buildHas(ret);
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} else {
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this.body.push(_core.types.expressionStatement(call));
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placeholderPath = "expression" + basePath;
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index = this.body.length - 1;
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}
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let callPath;
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if (isSwitch) {
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const {
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parentPath,
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listKey,
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key
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} = this.blockPath;
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this.blockPath.replaceWithMultiple(this.body);
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callPath = parentPath.get(listKey)[key + index];
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} else {
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block.body = this.body;
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callPath = this.blockPath.get("body")[index];
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}
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const placeholder = callPath.get(placeholderPath);
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let fnPath;
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if (this.loop) {
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const loopId = this.scope.generateUid("loop");
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const p = this.loopPath.insertBefore(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(_core.types.identifier(loopId), fn)]));
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placeholder.replaceWith(_core.types.identifier(loopId));
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fnPath = p[0].get("declarations.0.init");
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} else {
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placeholder.replaceWith(fn);
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fnPath = placeholder;
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}
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fnPath.unwrapFunctionEnvironment();
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}
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addContinuations(fn) {
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const state = {
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reassignments: {},
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returnStatements: [],
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outsideReferences: this.outsideLetReferences
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};
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this.scope.traverse(fn, continuationVisitor, state);
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for (let i = 0; i < fn.params.length; i++) {
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|
const param = fn.params[i];
|
|
if (!state.reassignments[param.name]) continue;
|
|
const paramName = param.name;
|
|
const newParamName = this.scope.generateUid(param.name);
|
|
fn.params[i] = _core.types.identifier(newParamName);
|
|
this.scope.rename(paramName, newParamName, fn);
|
|
state.returnStatements.forEach(returnStatement => {
|
|
returnStatement.insertBefore(_core.types.expressionStatement(_core.types.assignmentExpression("=", _core.types.identifier(paramName), _core.types.identifier(newParamName))));
|
|
});
|
|
fn.body.body.push(_core.types.expressionStatement(_core.types.assignmentExpression("=", _core.types.identifier(paramName), _core.types.identifier(newParamName))));
|
|
}
|
|
}
|
|
|
|
getLetReferences() {
|
|
const block = this.block;
|
|
let declarators = [];
|
|
|
|
if (this.loop) {
|
|
const init = this.loop.left || this.loop.init;
|
|
|
|
if (isBlockScoped(init)) {
|
|
declarators.push(init);
|
|
(0, _extend.default)(this.outsideLetReferences, _core.types.getBindingIdentifiers(init));
|
|
}
|
|
}
|
|
|
|
const addDeclarationsFromChild = (path, node) => {
|
|
node = node || path.node;
|
|
|
|
if (_core.types.isClassDeclaration(node) || _core.types.isFunctionDeclaration(node) || isBlockScoped(node)) {
|
|
if (isBlockScoped(node)) {
|
|
convertBlockScopedToVar(path, node, block, this.scope);
|
|
}
|
|
|
|
declarators = declarators.concat(node.declarations || node);
|
|
}
|
|
|
|
if (_core.types.isLabeledStatement(node)) {
|
|
addDeclarationsFromChild(path.get("body"), node.body);
|
|
}
|
|
};
|
|
|
|
if (block.body) {
|
|
const declarPaths = this.blockPath.get("body");
|
|
|
|
for (let i = 0; i < block.body.length; i++) {
|
|
addDeclarationsFromChild(declarPaths[i]);
|
|
}
|
|
}
|
|
|
|
if (block.cases) {
|
|
const declarPaths = this.blockPath.get("cases");
|
|
|
|
for (let i = 0; i < block.cases.length; i++) {
|
|
const consequents = block.cases[i].consequent;
|
|
|
|
for (let j = 0; j < consequents.length; j++) {
|
|
const declar = consequents[j];
|
|
addDeclarationsFromChild(declarPaths[i], declar);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (let i = 0; i < declarators.length; i++) {
|
|
const declar = declarators[i];
|
|
|
|
const keys = _core.types.getBindingIdentifiers(declar, false, true);
|
|
|
|
(0, _extend.default)(this.letReferences, keys);
|
|
this.hasLetReferences = true;
|
|
}
|
|
|
|
if (!this.hasLetReferences) return;
|
|
const state = {
|
|
letReferences: this.letReferences,
|
|
closurify: false,
|
|
loopDepth: 0,
|
|
tdzEnabled: this.tdzEnabled,
|
|
addHelper: name => this.state.addHelper(name)
|
|
};
|
|
|
|
if (isInLoop(this.blockPath)) {
|
|
state.loopDepth++;
|
|
}
|
|
|
|
this.blockPath.traverse(letReferenceBlockVisitor, state);
|
|
return state.closurify;
|
|
}
|
|
|
|
checkLoop() {
|
|
const state = {
|
|
hasBreakContinue: false,
|
|
ignoreLabeless: false,
|
|
inSwitchCase: false,
|
|
innerLabels: [],
|
|
hasReturn: false,
|
|
isLoop: !!this.loop,
|
|
map: {},
|
|
LOOP_IGNORE: Symbol()
|
|
};
|
|
this.blockPath.traverse(loopLabelVisitor, state);
|
|
this.blockPath.traverse(loopVisitor, state);
|
|
return state;
|
|
}
|
|
|
|
hoistVarDeclarations() {
|
|
this.blockPath.traverse(hoistVarDeclarationsVisitor, this);
|
|
}
|
|
|
|
pushDeclar(node) {
|
|
const declars = [];
|
|
|
|
const names = _core.types.getBindingIdentifiers(node);
|
|
|
|
for (const name of Object.keys(names)) {
|
|
declars.push(_core.types.variableDeclarator(names[name]));
|
|
}
|
|
|
|
this.body.push(_core.types.variableDeclaration(node.kind, declars));
|
|
const replace = [];
|
|
|
|
for (let i = 0; i < node.declarations.length; i++) {
|
|
const declar = node.declarations[i];
|
|
if (!declar.init) continue;
|
|
|
|
const expr = _core.types.assignmentExpression("=", _core.types.cloneNode(declar.id), _core.types.cloneNode(declar.init));
|
|
|
|
replace.push(_core.types.inherits(expr, declar));
|
|
}
|
|
|
|
return replace;
|
|
}
|
|
|
|
buildHas(ret) {
|
|
const body = this.body;
|
|
let retCheck;
|
|
const has = this.has;
|
|
const cases = [];
|
|
|
|
if (has.hasReturn) {
|
|
retCheck = buildRetCheck({
|
|
RETURN: _core.types.identifier(ret)
|
|
});
|
|
}
|
|
|
|
if (has.hasBreakContinue) {
|
|
for (const key of Object.keys(has.map)) {
|
|
cases.push(_core.types.switchCase(_core.types.stringLiteral(key), [has.map[key]]));
|
|
}
|
|
|
|
if (has.hasReturn) {
|
|
cases.push(_core.types.switchCase(null, [retCheck]));
|
|
}
|
|
|
|
if (cases.length === 1) {
|
|
const single = cases[0];
|
|
body.push(_core.types.ifStatement(_core.types.binaryExpression("===", _core.types.identifier(ret), single.test), single.consequent[0]));
|
|
} else {
|
|
if (this.loop) {
|
|
for (let i = 0; i < cases.length; i++) {
|
|
const caseConsequent = cases[i].consequent[0];
|
|
|
|
if (_core.types.isBreakStatement(caseConsequent) && !caseConsequent.label) {
|
|
if (!this.loopLabel) {
|
|
this.loopLabel = this.scope.generateUidIdentifier("loop");
|
|
}
|
|
|
|
caseConsequent.label = _core.types.cloneNode(this.loopLabel);
|
|
}
|
|
}
|
|
}
|
|
|
|
body.push(_core.types.switchStatement(_core.types.identifier(ret), cases));
|
|
}
|
|
} else {
|
|
if (has.hasReturn) {
|
|
body.push(retCheck);
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|