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104 lines
2.8 KiB
104 lines
2.8 KiB
3 years ago
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"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.annexB33FunctionsVisitor = void 0;
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exports.isVarScope = isVarScope;
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var _core = require("@babel/core");
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const annexB33FunctionsVisitor = {
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VariableDeclaration(path) {
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if (isStrict(path)) return;
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if (path.node.kind !== "var") return;
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const varScope = path.scope.getFunctionParent() || path.scope.getProgramParent();
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varScope.path.traverse(functionsToVarVisitor, {
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names: Object.keys(path.getBindingIdentifiers())
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});
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},
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BlockStatement(path) {
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if (isStrict(path)) return;
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if (_core.types.isFunction(path.parent, {
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body: path.node
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})) return;
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transformStatementList(path.get("body"));
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},
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SwitchCase(path) {
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if (isStrict(path)) return;
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transformStatementList(path.get("consequent"));
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}
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};
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exports.annexB33FunctionsVisitor = annexB33FunctionsVisitor;
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function transformStatementList(paths) {
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outer: for (const path of paths) {
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if (!path.isFunctionDeclaration()) continue;
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if (path.node.async || path.node.generator) return;
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const {
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scope
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} = path.parentPath;
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if (isVarScope(scope)) return;
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const {
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name
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} = path.node.id;
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let currScope = scope;
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do {
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if (currScope.parent.hasOwnBinding(name)) continue outer;
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currScope = currScope.parent;
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} while (!isVarScope(currScope));
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maybeTransformBlockScopedFunction(path);
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}
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}
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function maybeTransformBlockScopedFunction(path) {
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const {
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node,
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parentPath: {
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scope
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}
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} = path;
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const {
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id
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} = node;
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scope.removeOwnBinding(id.name);
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node.id = null;
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const varNode = _core.types.variableDeclaration("var", [_core.types.variableDeclarator(id, _core.types.toExpression(node))]);
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varNode._blockHoist = 2;
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const [varPath] = path.replaceWith(varNode);
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scope.registerDeclaration(varPath);
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}
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const functionsToVarVisitor = {
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Scope(path, {
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names
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}) {
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for (const name of names) {
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const binding = path.scope.getOwnBinding(name);
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if (binding && binding.kind === "hoisted") {
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maybeTransformBlockScopedFunction(binding.path);
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}
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}
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},
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"Expression|Declaration"(path) {
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path.skip();
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}
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};
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function isVarScope(scope) {
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return scope.path.isFunctionParent() || scope.path.isProgram();
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}
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function isStrict(path) {
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return !!path.find(({
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node
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}) => {
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var _node$directives;
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if (_core.types.isProgram(node)) {
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if (node.sourceType === "module") return true;
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} else if (_core.types.isClass(node)) {
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return true;
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} else if (!_core.types.isBlockStatement(node)) {
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return false;
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}
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return (_node$directives = node.directives) == null ? void 0 : _node$directives.some(directive => directive.value.value === "use strict");
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});
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}
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//# sourceMappingURL=annex-B_3_3.js.map
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