622 lines
18 KiB
JavaScript
Vendored
622 lines
18 KiB
JavaScript
Vendored
"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 = transformClass;
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var _helperFunctionName = require("@babel/helper-function-name");
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var _helperReplaceSupers = require("@babel/helper-replace-supers");
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var _helperEnvironmentVisitor = require("@babel/helper-environment-visitor");
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var _helperOptimiseCallExpression = require("@babel/helper-optimise-call-expression");
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var _core = require("@babel/core");
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var _helperAnnotateAsPure = require("@babel/helper-annotate-as-pure");
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var _inlineCreateSuperHelpers = require("./inline-createSuper-helpers");
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function buildConstructor(classRef, constructorBody, node) {
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const func = _core.types.functionDeclaration(_core.types.cloneNode(classRef), [], constructorBody);
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_core.types.inherits(func, node);
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return func;
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}
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function transformClass(path, file, builtinClasses, isLoose, assumptions) {
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const classState = {
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parent: undefined,
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scope: undefined,
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node: undefined,
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path: undefined,
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file: undefined,
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classId: undefined,
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classRef: undefined,
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superFnId: undefined,
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superName: undefined,
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superReturns: [],
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isDerived: false,
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extendsNative: false,
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construct: undefined,
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constructorBody: undefined,
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userConstructor: undefined,
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userConstructorPath: undefined,
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hasConstructor: false,
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staticPropBody: [],
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body: [],
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superThises: [],
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pushedConstructor: false,
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pushedInherits: false,
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pushedCreateClass: false,
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protoAlias: null,
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isLoose: false,
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dynamicKeys: new Map(),
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methods: {
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instance: {
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hasComputed: false,
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list: [],
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map: new Map()
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},
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static: {
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hasComputed: false,
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list: [],
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map: new Map()
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}
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}
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};
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const setState = newState => {
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Object.assign(classState, newState);
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};
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const findThisesVisitor = _core.traverse.visitors.merge([_helperEnvironmentVisitor.default, {
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ThisExpression(path) {
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classState.superThises.push(path);
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}
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}]);
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function createClassHelper(args) {
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return _core.types.callExpression(classState.file.addHelper("createClass"), args);
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}
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function maybeCreateConstructor() {
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let hasConstructor = false;
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const paths = classState.path.get("body.body");
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for (const path of paths) {
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hasConstructor = path.equals("kind", "constructor");
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if (hasConstructor) break;
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}
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if (hasConstructor) return;
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let params, body;
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if (classState.isDerived) {
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const constructor = _core.template.expression.ast`
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(function () {
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super(...arguments);
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})
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`;
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params = constructor.params;
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body = constructor.body;
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} else {
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params = [];
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body = _core.types.blockStatement([]);
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}
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classState.path.get("body").unshiftContainer("body", _core.types.classMethod("constructor", _core.types.identifier("constructor"), params, body));
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}
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function buildBody() {
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maybeCreateConstructor();
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pushBody();
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verifyConstructor();
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if (classState.userConstructor) {
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const {
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constructorBody,
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userConstructor,
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construct
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} = classState;
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constructorBody.body.push(...userConstructor.body.body);
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_core.types.inherits(construct, userConstructor);
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_core.types.inherits(constructorBody, userConstructor.body);
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}
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pushDescriptors();
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}
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function pushBody() {
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const classBodyPaths = classState.path.get("body.body");
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for (const path of classBodyPaths) {
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const node = path.node;
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if (path.isClassProperty()) {
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throw path.buildCodeFrameError("Missing class properties transform.");
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}
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if (node.decorators) {
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throw path.buildCodeFrameError("Method has decorators, put the decorator plugin before the classes one.");
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}
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if (_core.types.isClassMethod(node)) {
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const isConstructor = node.kind === "constructor";
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const replaceSupers = new _helperReplaceSupers.default({
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methodPath: path,
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objectRef: classState.classRef,
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superRef: classState.superName,
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constantSuper: assumptions.constantSuper,
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file: classState.file,
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refToPreserve: classState.classRef
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});
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replaceSupers.replace();
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const superReturns = [];
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path.traverse(_core.traverse.visitors.merge([_helperEnvironmentVisitor.default, {
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ReturnStatement(path) {
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if (!path.getFunctionParent().isArrowFunctionExpression()) {
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superReturns.push(path);
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}
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}
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}]));
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if (isConstructor) {
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pushConstructor(superReturns, node, path);
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} else {
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pushMethod(node, path);
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}
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}
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}
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}
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function pushDescriptors() {
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pushInheritsToBody();
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const {
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body
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} = classState;
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const props = {
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instance: null,
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static: null
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};
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for (const placement of ["static", "instance"]) {
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if (classState.methods[placement].list.length) {
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props[placement] = classState.methods[placement].list.map(desc => {
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const obj = _core.types.objectExpression([_core.types.objectProperty(_core.types.identifier("key"), desc.key)]);
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for (const kind of ["get", "set", "value"]) {
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if (desc[kind] != null) {
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obj.properties.push(_core.types.objectProperty(_core.types.identifier(kind), desc[kind]));
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}
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}
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return obj;
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});
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}
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}
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if (props.instance || props.static) {
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let args = [_core.types.cloneNode(classState.classRef), props.instance ? _core.types.arrayExpression(props.instance) : _core.types.nullLiteral(), props.static ? _core.types.arrayExpression(props.static) : _core.types.nullLiteral()];
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let lastNonNullIndex = 0;
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for (let i = 0; i < args.length; i++) {
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if (!_core.types.isNullLiteral(args[i])) lastNonNullIndex = i;
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}
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args = args.slice(0, lastNonNullIndex + 1);
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body.push(_core.types.expressionStatement(createClassHelper(args)));
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classState.pushedCreateClass = true;
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}
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}
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function wrapSuperCall(bareSuper, superRef, thisRef, body) {
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const bareSuperNode = bareSuper.node;
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let call;
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if (assumptions.superIsCallableConstructor) {
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bareSuperNode.arguments.unshift(_core.types.thisExpression());
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if (bareSuperNode.arguments.length === 2 && _core.types.isSpreadElement(bareSuperNode.arguments[1]) && _core.types.isIdentifier(bareSuperNode.arguments[1].argument, {
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name: "arguments"
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})) {
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bareSuperNode.arguments[1] = bareSuperNode.arguments[1].argument;
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bareSuperNode.callee = _core.types.memberExpression(_core.types.cloneNode(superRef), _core.types.identifier("apply"));
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} else {
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bareSuperNode.callee = _core.types.memberExpression(_core.types.cloneNode(superRef), _core.types.identifier("call"));
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}
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call = _core.types.logicalExpression("||", bareSuperNode, _core.types.thisExpression());
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} else {
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call = (0, _helperOptimiseCallExpression.default)(_core.types.cloneNode(classState.superFnId), _core.types.thisExpression(), bareSuperNode.arguments, false);
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}
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if (bareSuper.parentPath.isExpressionStatement() && bareSuper.parentPath.container === body.node.body && body.node.body.length - 1 === bareSuper.parentPath.key) {
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if (classState.superThises.length) {
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call = _core.types.assignmentExpression("=", thisRef(), call);
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}
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bareSuper.parentPath.replaceWith(_core.types.returnStatement(call));
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} else {
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bareSuper.replaceWith(_core.types.assignmentExpression("=", thisRef(), call));
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}
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}
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function verifyConstructor() {
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if (!classState.isDerived) return;
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const path = classState.userConstructorPath;
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const body = path.get("body");
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path.traverse(findThisesVisitor);
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let thisRef = function () {
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const ref = path.scope.generateDeclaredUidIdentifier("this");
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thisRef = () => _core.types.cloneNode(ref);
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return ref;
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};
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for (const thisPath of classState.superThises) {
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const {
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node,
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parentPath
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} = thisPath;
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if (parentPath.isMemberExpression({
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object: node
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})) {
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thisPath.replaceWith(thisRef());
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continue;
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}
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thisPath.replaceWith(_core.types.callExpression(classState.file.addHelper("assertThisInitialized"), [thisRef()]));
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}
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const bareSupers = new Set();
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path.traverse(_core.traverse.visitors.merge([_helperEnvironmentVisitor.default, {
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Super(path) {
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const {
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node,
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parentPath
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} = path;
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if (parentPath.isCallExpression({
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callee: node
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})) {
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bareSupers.add(parentPath);
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}
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}
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}]));
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let guaranteedSuperBeforeFinish = !!bareSupers.size;
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for (const bareSuper of bareSupers) {
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wrapSuperCall(bareSuper, classState.superName, thisRef, body);
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if (guaranteedSuperBeforeFinish) {
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bareSuper.find(function (parentPath) {
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if (parentPath === path) {
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return true;
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}
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if (parentPath.isLoop() || parentPath.isConditional() || parentPath.isArrowFunctionExpression()) {
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guaranteedSuperBeforeFinish = false;
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return true;
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}
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});
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}
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}
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let wrapReturn;
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if (classState.isLoose) {
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wrapReturn = returnArg => {
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const thisExpr = _core.types.callExpression(classState.file.addHelper("assertThisInitialized"), [thisRef()]);
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return returnArg ? _core.types.logicalExpression("||", returnArg, thisExpr) : thisExpr;
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};
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} else {
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wrapReturn = returnArg => _core.types.callExpression(classState.file.addHelper("possibleConstructorReturn"), [thisRef()].concat(returnArg || []));
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}
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const bodyPaths = body.get("body");
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if (!bodyPaths.length || !bodyPaths.pop().isReturnStatement()) {
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body.pushContainer("body", _core.types.returnStatement(guaranteedSuperBeforeFinish ? thisRef() : wrapReturn()));
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}
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for (const returnPath of classState.superReturns) {
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returnPath.get("argument").replaceWith(wrapReturn(returnPath.node.argument));
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}
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}
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function pushMethod(node, path) {
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const scope = path ? path.scope : classState.scope;
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if (node.kind === "method") {
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if (processMethod(node, scope)) return;
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}
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const placement = node.static ? "static" : "instance";
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const methods = classState.methods[placement];
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const descKey = node.kind === "method" ? "value" : node.kind;
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const key = _core.types.isNumericLiteral(node.key) || _core.types.isBigIntLiteral(node.key) ? _core.types.stringLiteral(String(node.key.value)) : _core.types.toComputedKey(node);
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let fn = _core.types.toExpression(node);
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if (_core.types.isStringLiteral(key)) {
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if (node.kind === "method") {
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fn = (0, _helperFunctionName.default)({
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id: key,
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node: node,
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scope
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});
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}
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} else {
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methods.hasComputed = true;
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}
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let descriptor;
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if (!methods.hasComputed && methods.map.has(key.value)) {
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descriptor = methods.map.get(key.value);
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descriptor[descKey] = fn;
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if (descKey === "value") {
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descriptor.get = null;
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descriptor.set = null;
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} else {
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descriptor.value = null;
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}
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} else {
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descriptor = {
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key: key,
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[descKey]: fn
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};
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methods.list.push(descriptor);
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if (!methods.hasComputed) {
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methods.map.set(key.value, descriptor);
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}
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}
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}
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function processMethod(node, scope) {
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if (assumptions.setClassMethods && !node.decorators) {
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let {
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classRef
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} = classState;
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if (!node.static) {
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insertProtoAliasOnce();
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classRef = classState.protoAlias;
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}
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const methodName = _core.types.memberExpression(_core.types.cloneNode(classRef), node.key, node.computed || _core.types.isLiteral(node.key));
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let func = _core.types.functionExpression(null, node.params, node.body, node.generator, node.async);
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_core.types.inherits(func, node);
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const key = _core.types.toComputedKey(node, node.key);
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if (_core.types.isStringLiteral(key)) {
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func = (0, _helperFunctionName.default)({
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node: func,
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id: key,
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scope
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});
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}
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const expr = _core.types.expressionStatement(_core.types.assignmentExpression("=", methodName, func));
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_core.types.inheritsComments(expr, node);
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classState.body.push(expr);
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return true;
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}
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return false;
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}
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function insertProtoAliasOnce() {
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if (classState.protoAlias === null) {
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setState({
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protoAlias: classState.scope.generateUidIdentifier("proto")
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});
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const classProto = _core.types.memberExpression(classState.classRef, _core.types.identifier("prototype"));
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const protoDeclaration = _core.types.variableDeclaration("var", [_core.types.variableDeclarator(classState.protoAlias, classProto)]);
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classState.body.push(protoDeclaration);
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}
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}
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function pushConstructor(superReturns, method, path) {
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setState({
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userConstructorPath: path,
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userConstructor: method,
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hasConstructor: true,
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superReturns
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});
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const {
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construct
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} = classState;
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_core.types.inheritsComments(construct, method);
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construct.params = method.params;
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_core.types.inherits(construct.body, method.body);
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construct.body.directives = method.body.directives;
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pushConstructorToBody();
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}
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function pushConstructorToBody() {
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if (classState.pushedConstructor) return;
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classState.pushedConstructor = true;
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if (classState.hasInstanceDescriptors || classState.hasStaticDescriptors) {
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pushDescriptors();
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}
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classState.body.push(classState.construct);
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pushInheritsToBody();
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}
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function pushInheritsToBody() {
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if (!classState.isDerived || classState.pushedInherits) return;
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const superFnId = path.scope.generateUidIdentifier("super");
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setState({
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pushedInherits: true,
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superFnId
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});
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if (!assumptions.superIsCallableConstructor) {
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classState.body.unshift(_core.types.variableDeclaration("var", [_core.types.variableDeclarator(superFnId, _core.types.callExpression((0, _inlineCreateSuperHelpers.default)(classState.file), [_core.types.cloneNode(classState.classRef)]))]));
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}
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classState.body.unshift(_core.types.expressionStatement(_core.types.callExpression(classState.file.addHelper(classState.isLoose ? "inheritsLoose" : "inherits"), [_core.types.cloneNode(classState.classRef), _core.types.cloneNode(classState.superName)])));
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}
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function extractDynamicKeys() {
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const {
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dynamicKeys,
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node,
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scope
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} = classState;
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for (const elem of node.body.body) {
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if (!_core.types.isClassMethod(elem) || !elem.computed) continue;
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if (scope.isPure(elem.key, true)) continue;
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const id = scope.generateUidIdentifierBasedOnNode(elem.key);
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dynamicKeys.set(id.name, elem.key);
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elem.key = id;
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}
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}
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function setupClosureParamsArgs() {
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const {
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superName,
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dynamicKeys
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} = classState;
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const closureParams = [];
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const closureArgs = [];
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if (classState.isDerived) {
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let arg = _core.types.cloneNode(superName);
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if (classState.extendsNative) {
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arg = _core.types.callExpression(classState.file.addHelper("wrapNativeSuper"), [arg]);
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(0, _helperAnnotateAsPure.default)(arg);
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}
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const param = classState.scope.generateUidIdentifierBasedOnNode(superName);
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closureParams.push(param);
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closureArgs.push(arg);
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setState({
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superName: _core.types.cloneNode(param)
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});
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}
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for (const [name, value] of dynamicKeys) {
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closureParams.push(_core.types.identifier(name));
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closureArgs.push(value);
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}
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return {
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closureParams,
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closureArgs
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};
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}
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function classTransformer(path, file, builtinClasses, isLoose) {
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setState({
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parent: path.parent,
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scope: path.scope,
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node: path.node,
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path,
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file,
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isLoose
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});
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setState({
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classId: classState.node.id,
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classRef: classState.node.id ? _core.types.identifier(classState.node.id.name) : classState.scope.generateUidIdentifier("class"),
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superName: classState.node.superClass,
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isDerived: !!classState.node.superClass,
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constructorBody: _core.types.blockStatement([])
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});
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setState({
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extendsNative: classState.isDerived && builtinClasses.has(classState.superName.name) && !classState.scope.hasBinding(classState.superName.name, true)
|
|
});
|
|
const {
|
|
classRef,
|
|
node,
|
|
constructorBody
|
|
} = classState;
|
|
setState({
|
|
construct: buildConstructor(classRef, constructorBody, node)
|
|
});
|
|
extractDynamicKeys();
|
|
const {
|
|
body
|
|
} = classState;
|
|
const {
|
|
closureParams,
|
|
closureArgs
|
|
} = setupClosureParamsArgs();
|
|
buildBody();
|
|
|
|
if (!assumptions.noClassCalls) {
|
|
constructorBody.body.unshift(_core.types.expressionStatement(_core.types.callExpression(classState.file.addHelper("classCallCheck"), [_core.types.thisExpression(), _core.types.cloneNode(classState.classRef)])));
|
|
}
|
|
|
|
body.push(...classState.staticPropBody.map(fn => fn(_core.types.cloneNode(classState.classRef))));
|
|
const isStrict = path.isInStrictMode();
|
|
let constructorOnly = classState.classId && body.length === 1;
|
|
|
|
if (constructorOnly && !isStrict) {
|
|
for (const param of classState.construct.params) {
|
|
if (!_core.types.isIdentifier(param)) {
|
|
constructorOnly = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
const directives = constructorOnly ? body[0].body.directives : [];
|
|
|
|
if (!isStrict) {
|
|
directives.push(_core.types.directive(_core.types.directiveLiteral("use strict")));
|
|
}
|
|
|
|
if (constructorOnly) {
|
|
const expr = _core.types.toExpression(body[0]);
|
|
|
|
return classState.isLoose ? expr : createClassHelper([expr]);
|
|
}
|
|
|
|
let returnArg = _core.types.cloneNode(classState.classRef);
|
|
|
|
if (!classState.pushedCreateClass && !classState.isLoose) {
|
|
returnArg = createClassHelper([returnArg]);
|
|
}
|
|
|
|
body.push(_core.types.returnStatement(returnArg));
|
|
|
|
const container = _core.types.arrowFunctionExpression(closureParams, _core.types.blockStatement(body, directives));
|
|
|
|
return _core.types.callExpression(container, closureArgs);
|
|
}
|
|
|
|
return classTransformer(path, file, builtinClasses, isLoose);
|
|
} |