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