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402 lines
13 KiB
402 lines
13 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 _pluginSyntaxObjectRestSpread = _interopRequireDefault(require("@babel/plugin-syntax-object-rest-spread"));
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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 ZERO_REFS = (() => {
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const node = _core.types.identifier("a");
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const property = _core.types.objectProperty(_core.types.identifier("key"), node);
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const pattern = _core.types.objectPattern([property]);
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return _core.types.isReferenced(node, property, pattern) ? 1 : 0;
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})();
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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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useBuiltIns = false,
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loose = false
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} = opts;
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if (typeof loose !== "boolean") {
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throw new Error(".loose must be a boolean, or undefined");
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}
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function getExtendsHelper(file) {
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return useBuiltIns ? _core.types.memberExpression(_core.types.identifier("Object"), _core.types.identifier("assign")) : file.addHelper("extends");
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}
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function hasRestElement(path) {
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let foundRestElement = false;
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visitRestElements(path, restElement => {
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foundRestElement = true;
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restElement.stop();
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});
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return foundRestElement;
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}
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function hasObjectPatternRestElement(path) {
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let foundRestElement = false;
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visitRestElements(path, restElement => {
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if (restElement.parentPath.isObjectPattern()) {
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foundRestElement = true;
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restElement.stop();
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}
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});
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return foundRestElement;
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}
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function visitRestElements(path, visitor) {
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path.traverse({
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Expression(path) {
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const parentType = path.parent.type;
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if (parentType === "AssignmentPattern" && path.key === "right" || parentType === "ObjectProperty" && path.parent.computed && path.key === "key") {
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path.skip();
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}
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},
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RestElement: visitor
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});
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}
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function hasSpread(node) {
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for (const prop of node.properties) {
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if (_core.types.isSpreadElement(prop)) {
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return true;
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}
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}
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return false;
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}
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function extractNormalizedKeys(path) {
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const props = path.node.properties;
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const keys = [];
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let allLiteral = true;
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for (const prop of props) {
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if (_core.types.isIdentifier(prop.key) && !prop.computed) {
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keys.push(_core.types.stringLiteral(prop.key.name));
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} else if (_core.types.isTemplateLiteral(prop.key)) {
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keys.push(_core.types.cloneNode(prop.key));
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} else if (_core.types.isLiteral(prop.key)) {
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keys.push(_core.types.stringLiteral(String(prop.key.value)));
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} else {
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keys.push(_core.types.cloneNode(prop.key));
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allLiteral = false;
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}
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}
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return {
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keys,
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allLiteral
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};
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}
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function replaceImpureComputedKeys(path) {
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const impureComputedPropertyDeclarators = [];
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for (const propPath of path.get("properties")) {
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const key = propPath.get("key");
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if (propPath.node.computed && !key.isPure()) {
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const name = path.scope.generateUidBasedOnNode(key.node);
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const declarator = _core.types.variableDeclarator(_core.types.identifier(name), key.node);
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impureComputedPropertyDeclarators.push(declarator);
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key.replaceWith(_core.types.identifier(name));
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}
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}
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return impureComputedPropertyDeclarators;
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}
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function removeUnusedExcludedKeys(path) {
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const bindings = path.getOuterBindingIdentifierPaths();
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Object.keys(bindings).forEach(bindingName => {
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const bindingParentPath = bindings[bindingName].parentPath;
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if (path.scope.getBinding(bindingName).references > ZERO_REFS || !bindingParentPath.isObjectProperty()) {
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return;
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}
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bindingParentPath.remove();
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});
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}
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function createObjectSpread(path, file, objRef) {
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const props = path.get("properties");
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const last = props[props.length - 1];
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_core.types.assertRestElement(last.node);
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const restElement = _core.types.cloneNode(last.node);
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last.remove();
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const impureComputedPropertyDeclarators = replaceImpureComputedKeys(path);
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const {
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keys,
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allLiteral
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} = extractNormalizedKeys(path);
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if (keys.length === 0) {
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return [impureComputedPropertyDeclarators, restElement.argument, _core.types.callExpression(getExtendsHelper(file), [_core.types.objectExpression([]), _core.types.cloneNode(objRef)])];
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}
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let keyExpression;
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if (!allLiteral) {
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keyExpression = _core.types.callExpression(_core.types.memberExpression(_core.types.arrayExpression(keys), _core.types.identifier("map")), [file.addHelper("toPropertyKey")]);
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} else {
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keyExpression = _core.types.arrayExpression(keys);
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}
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return [impureComputedPropertyDeclarators, restElement.argument, _core.types.callExpression(file.addHelper(`objectWithoutProperties${loose ? "Loose" : ""}`), [_core.types.cloneNode(objRef), keyExpression])];
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}
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function replaceRestElement(parentPath, paramPath) {
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if (paramPath.isAssignmentPattern()) {
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replaceRestElement(parentPath, paramPath.get("left"));
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return;
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}
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if (paramPath.isArrayPattern() && hasRestElement(paramPath)) {
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const elements = paramPath.get("elements");
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for (let i = 0; i < elements.length; i++) {
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replaceRestElement(parentPath, elements[i]);
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}
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}
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if (paramPath.isObjectPattern() && hasRestElement(paramPath)) {
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const uid = parentPath.scope.generateUidIdentifier("ref");
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const declar = _core.types.variableDeclaration("let", [_core.types.variableDeclarator(paramPath.node, uid)]);
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parentPath.ensureBlock();
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parentPath.get("body").unshiftContainer("body", declar);
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paramPath.replaceWith(_core.types.cloneNode(uid));
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}
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}
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return {
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name: "proposal-object-rest-spread",
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inherits: _pluginSyntaxObjectRestSpread.default,
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visitor: {
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Function(path) {
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const params = path.get("params");
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for (let i = params.length - 1; i >= 0; i--) {
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replaceRestElement(params[i].parentPath, params[i]);
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}
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},
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VariableDeclarator(path, file) {
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if (!path.get("id").isObjectPattern()) {
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return;
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}
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let insertionPath = path;
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const originalPath = path;
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visitRestElements(path.get("id"), path => {
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if (!path.parentPath.isObjectPattern()) {
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return;
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}
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if (originalPath.node.id.properties.length > 1 && !_core.types.isIdentifier(originalPath.node.init)) {
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const initRef = path.scope.generateUidIdentifierBasedOnNode(originalPath.node.init, "ref");
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originalPath.insertBefore(_core.types.variableDeclarator(initRef, originalPath.node.init));
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originalPath.replaceWith(_core.types.variableDeclarator(originalPath.node.id, _core.types.cloneNode(initRef)));
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return;
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}
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let ref = originalPath.node.init;
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const refPropertyPath = [];
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let kind;
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path.findParent(path => {
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if (path.isObjectProperty()) {
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refPropertyPath.unshift(path.node.key.name);
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} else if (path.isVariableDeclarator()) {
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kind = path.parentPath.node.kind;
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return true;
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}
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});
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if (refPropertyPath.length) {
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refPropertyPath.forEach(prop => {
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ref = _core.types.memberExpression(ref, _core.types.identifier(prop));
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});
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}
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const objectPatternPath = path.findParent(path => path.isObjectPattern());
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const [impureComputedPropertyDeclarators, argument, callExpression] = createObjectSpread(objectPatternPath, file, ref);
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if (loose) {
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removeUnusedExcludedKeys(objectPatternPath);
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}
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_core.types.assertIdentifier(argument);
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insertionPath.insertBefore(impureComputedPropertyDeclarators);
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insertionPath.insertAfter(_core.types.variableDeclarator(argument, callExpression));
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insertionPath = insertionPath.getSibling(insertionPath.key + 1);
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path.scope.registerBinding(kind, insertionPath);
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if (objectPatternPath.node.properties.length === 0) {
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objectPatternPath.findParent(path => path.isObjectProperty() || path.isVariableDeclarator()).remove();
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}
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});
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},
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ExportNamedDeclaration(path) {
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const declaration = path.get("declaration");
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if (!declaration.isVariableDeclaration()) return;
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const hasRest = declaration.get("declarations").some(path => hasRestElement(path.get("id")));
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if (!hasRest) return;
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const specifiers = [];
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for (const name of Object.keys(path.getOuterBindingIdentifiers(path))) {
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specifiers.push(_core.types.exportSpecifier(_core.types.identifier(name), _core.types.identifier(name)));
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}
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path.replaceWith(declaration.node);
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path.insertAfter(_core.types.exportNamedDeclaration(null, specifiers));
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},
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CatchClause(path) {
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const paramPath = path.get("param");
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replaceRestElement(paramPath.parentPath, paramPath);
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},
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AssignmentExpression(path, file) {
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const leftPath = path.get("left");
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if (leftPath.isObjectPattern() && hasRestElement(leftPath)) {
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const nodes = [];
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const refName = path.scope.generateUidBasedOnNode(path.node.right, "ref");
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nodes.push(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(_core.types.identifier(refName), path.node.right)]));
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const [impureComputedPropertyDeclarators, argument, callExpression] = createObjectSpread(leftPath, file, _core.types.identifier(refName));
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if (impureComputedPropertyDeclarators.length > 0) {
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nodes.push(_core.types.variableDeclaration("var", impureComputedPropertyDeclarators));
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}
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const nodeWithoutSpread = _core.types.cloneNode(path.node);
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nodeWithoutSpread.right = _core.types.identifier(refName);
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nodes.push(_core.types.expressionStatement(nodeWithoutSpread));
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nodes.push(_core.types.toStatement(_core.types.assignmentExpression("=", argument, callExpression)));
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nodes.push(_core.types.expressionStatement(_core.types.identifier(refName)));
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path.replaceWithMultiple(nodes);
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}
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},
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ForXStatement(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 leftPath = path.get("left");
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const left = node.left;
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if (!hasObjectPatternRestElement(leftPath)) {
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return;
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}
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if (!_core.types.isVariableDeclaration(left)) {
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const temp = scope.generateUidIdentifier("ref");
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node.left = _core.types.variableDeclaration("var", [_core.types.variableDeclarator(temp)]);
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path.ensureBlock();
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if (node.body.body.length === 0 && path.isCompletionRecord()) {
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node.body.body.unshift(_core.types.expressionStatement(scope.buildUndefinedNode()));
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}
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node.body.body.unshift(_core.types.expressionStatement(_core.types.assignmentExpression("=", left, _core.types.cloneNode(temp))));
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} else {
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const pattern = left.declarations[0].id;
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const key = scope.generateUidIdentifier("ref");
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node.left = _core.types.variableDeclaration(left.kind, [_core.types.variableDeclarator(key, null)]);
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path.ensureBlock();
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node.body.body.unshift(_core.types.variableDeclaration(node.left.kind, [_core.types.variableDeclarator(pattern, _core.types.cloneNode(key))]));
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}
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},
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ArrayPattern(path) {
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const objectPatterns = [];
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visitRestElements(path, path => {
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if (!path.parentPath.isObjectPattern()) {
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return;
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}
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const objectPattern = path.parentPath;
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const uid = path.scope.generateUidIdentifier("ref");
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objectPatterns.push(_core.types.variableDeclarator(objectPattern.node, uid));
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objectPattern.replaceWith(_core.types.cloneNode(uid));
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path.skip();
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});
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if (objectPatterns.length > 0) {
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const statementPath = path.getStatementParent();
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statementPath.insertAfter(_core.types.variableDeclaration(statementPath.node.kind || "var", objectPatterns));
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}
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},
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ObjectExpression(path, file) {
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if (!hasSpread(path.node)) return;
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const args = [];
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let props = [];
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function push() {
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args.push(_core.types.objectExpression(props));
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props = [];
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}
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for (const prop of path.node.properties) {
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if (_core.types.isSpreadElement(prop)) {
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push();
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args.push(prop.argument);
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} else {
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props.push(prop);
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}
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}
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if (props.length) {
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push();
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}
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let helper;
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if (loose) {
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helper = getExtendsHelper(file);
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} else {
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try {
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helper = file.addHelper("objectSpread2");
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} catch (_unused) {
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this.file.declarations["objectSpread2"] = null;
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helper = file.addHelper("objectSpread");
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}
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}
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path.replaceWith(_core.types.callExpression(helper, args));
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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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