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Thu, Jan 23, 23:24

index.js
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"use strict";
Object.defineProperty(exports, "__esModule", {
value: true
});
exports.default = void 0;
var _renamer = _interopRequireDefault(require("./lib/renamer"));
var _index = _interopRequireDefault(require("../index"));
var _binding = _interopRequireDefault(require("./binding"));
var _globals = _interopRequireDefault(require("globals"));
var t = _interopRequireWildcard(require("@babel/types"));
var _cache = require("../cache");
function _getRequireWildcardCache() { if (typeof WeakMap !== "function") return null; var cache = new WeakMap(); _getRequireWildcardCache = function () { return cache; }; return cache; }
function _interopRequireWildcard(obj) { if (obj && obj.__esModule) { return obj; } if (obj === null || typeof obj !== "object" && typeof obj !== "function") { return { default: obj }; } var cache = _getRequireWildcardCache(); if (cache && cache.has(obj)) { return cache.get(obj); } var newObj = {}; var hasPropertyDescriptor = Object.defineProperty && Object.getOwnPropertyDescriptor; for (var key in obj) { if (Object.prototype.hasOwnProperty.call(obj, key)) { var desc = hasPropertyDescriptor ? Object.getOwnPropertyDescriptor(obj, key) : null; if (desc && (desc.get || desc.set)) { Object.defineProperty(newObj, key, desc); } else { newObj[key] = obj[key]; } } } newObj.default = obj; if (cache) { cache.set(obj, newObj); } return newObj; }
function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
function gatherNodeParts(node, parts) {
switch (node == null ? void 0 : node.type) {
default:
if (t.isModuleDeclaration(node)) {
if (node.source) {
gatherNodeParts(node.source, parts);
} else if (node.specifiers && node.specifiers.length) {
for (const e of node.specifiers) gatherNodeParts(e, parts);
} else if (node.declaration) {
gatherNodeParts(node.declaration, parts);
}
} else if (t.isModuleSpecifier(node)) {
gatherNodeParts(node.local, parts);
} else if (t.isLiteral(node)) {
parts.push(node.value);
}
break;
case "MemberExpression":
case "OptionalMemberExpression":
case "JSXMemberExpression":
gatherNodeParts(node.object, parts);
gatherNodeParts(node.property, parts);
break;
case "Identifier":
case "JSXIdentifier":
parts.push(node.name);
break;
case "CallExpression":
case "OptionalCallExpression":
case "NewExpression":
gatherNodeParts(node.callee, parts);
break;
case "ObjectExpression":
case "ObjectPattern":
for (const e of node.properties) {
gatherNodeParts(e, parts);
}
break;
case "SpreadElement":
case "RestElement":
gatherNodeParts(node.argument, parts);
break;
case "ObjectProperty":
case "ObjectMethod":
case "ClassProperty":
case "ClassMethod":
case "ClassPrivateProperty":
case "ClassPrivateMethod":
gatherNodeParts(node.key, parts);
break;
case "ThisExpression":
parts.push("this");
break;
case "Super":
parts.push("super");
break;
case "Import":
parts.push("import");
break;
case "DoExpression":
parts.push("do");
break;
case "YieldExpression":
parts.push("yield");
gatherNodeParts(node.argument, parts);
break;
case "AwaitExpression":
parts.push("await");
gatherNodeParts(node.argument, parts);
break;
case "AssignmentExpression":
gatherNodeParts(node.left, parts);
break;
case "VariableDeclarator":
gatherNodeParts(node.id, parts);
break;
case "FunctionExpression":
case "FunctionDeclaration":
case "ClassExpression":
case "ClassDeclaration":
gatherNodeParts(node.id, parts);
break;
case "PrivateName":
gatherNodeParts(node.id, parts);
break;
case "ParenthesizedExpression":
gatherNodeParts(node.expression, parts);
break;
case "UnaryExpression":
case "UpdateExpression":
gatherNodeParts(node.argument, parts);
break;
case "MetaProperty":
gatherNodeParts(node.meta, parts);
gatherNodeParts(node.property, parts);
break;
case "JSXElement":
gatherNodeParts(node.openingElement, parts);
break;
case "JSXOpeningElement":
parts.push(node.name);
break;
case "JSXFragment":
gatherNodeParts(node.openingFragment, parts);
break;
case "JSXOpeningFragment":
parts.push("Fragment");
break;
case "JSXNamespacedName":
gatherNodeParts(node.namespace, parts);
gatherNodeParts(node.name, parts);
break;
}
}
const collectorVisitor = {
For(path) {
for (const key of t.FOR_INIT_KEYS) {
const declar = path.get(key);
if (declar.isVar()) {
const parentScope = path.scope.getFunctionParent() || path.scope.getProgramParent();
parentScope.registerBinding("var", declar);
}
}
},
Declaration(path) {
if (path.isBlockScoped()) return;
if (path.isExportDeclaration() && path.get("declaration").isDeclaration()) {
return;
}
const parent = path.scope.getFunctionParent() || path.scope.getProgramParent();
parent.registerDeclaration(path);
},
ReferencedIdentifier(path, state) {
state.references.push(path);
},
ForXStatement(path, state) {
const left = path.get("left");
if (left.isPattern() || left.isIdentifier()) {
state.constantViolations.push(path);
}
},
ExportDeclaration: {
exit(path) {
const {
node,
scope
} = path;
const declar = node.declaration;
if (t.isClassDeclaration(declar) || t.isFunctionDeclaration(declar)) {
const id = declar.id;
if (!id) return;
const binding = scope.getBinding(id.name);
if (binding) binding.reference(path);
} else if (t.isVariableDeclaration(declar)) {
for (const decl of declar.declarations) {
for (const name of Object.keys(t.getBindingIdentifiers(decl))) {
const binding = scope.getBinding(name);
if (binding) binding.reference(path);
}
}
}
}
},
LabeledStatement(path) {
path.scope.getProgramParent().addGlobal(path.node);
path.scope.getBlockParent().registerDeclaration(path);
},
AssignmentExpression(path, state) {
state.assignments.push(path);
},
UpdateExpression(path, state) {
state.constantViolations.push(path);
},
UnaryExpression(path, state) {
if (path.node.operator === "delete") {
state.constantViolations.push(path);
}
},
BlockScoped(path) {
let scope = path.scope;
if (scope.path === path) scope = scope.parent;
const parent = scope.getBlockParent();
parent.registerDeclaration(path);
if (path.isClassDeclaration() && path.node.id) {
const id = path.node.id;
const name = id.name;
path.scope.bindings[name] = path.scope.parent.getBinding(name);
}
},
Block(path) {
const paths = path.get("body");
for (const bodyPath of paths) {
if (bodyPath.isFunctionDeclaration()) {
path.scope.getBlockParent().registerDeclaration(bodyPath);
}
}
},
CatchClause(path) {
path.scope.registerBinding("let", path);
},
Function(path) {
if (path.isFunctionExpression() && path.has("id") && !path.get("id").node[t.NOT_LOCAL_BINDING]) {
path.scope.registerBinding("local", path.get("id"), path);
}
const params = path.get("params");
for (const param of params) {
path.scope.registerBinding("param", param);
}
},
ClassExpression(path) {
if (path.has("id") && !path.get("id").node[t.NOT_LOCAL_BINDING]) {
path.scope.registerBinding("local", path);
}
}
};
let uid = 0;
class Scope {
constructor(path) {
const {
node
} = path;
const cached = _cache.scope.get(node);
if ((cached == null ? void 0 : cached.path) === path) {
return cached;
}
_cache.scope.set(node, this);
this.uid = uid++;
this.block = node;
this.path = path;
this.labels = new Map();
this.inited = false;
}
get parent() {
const parent = this.path.findParent(p => p.isScope());
return parent == null ? void 0 : parent.scope;
}
get parentBlock() {
return this.path.parent;
}
get hub() {
return this.path.hub;
}
traverse(node, opts, state) {
(0, _index.default)(node, opts, this, state, this.path);
}
generateDeclaredUidIdentifier(name) {
const id = this.generateUidIdentifier(name);
this.push({
id
});
return t.cloneNode(id);
}
generateUidIdentifier(name) {
return t.identifier(this.generateUid(name));
}
generateUid(name = "temp") {
name = t.toIdentifier(name).replace(/^_+/, "").replace(/[0-9]+$/g, "");
let uid;
let i = 1;
do {
uid = this._generateUid(name, i);
i++;
} while (this.hasLabel(uid) || this.hasBinding(uid) || this.hasGlobal(uid) || this.hasReference(uid));
const program = this.getProgramParent();
program.references[uid] = true;
program.uids[uid] = true;
return uid;
}
_generateUid(name, i) {
let id = name;
if (i > 1) id += i;
return `_${id}`;
}
generateUidBasedOnNode(node, defaultName) {
const parts = [];
gatherNodeParts(node, parts);
let id = parts.join("$");
id = id.replace(/^_/, "") || defaultName || "ref";
return this.generateUid(id.slice(0, 20));
}
generateUidIdentifierBasedOnNode(node, defaultName) {
return t.identifier(this.generateUidBasedOnNode(node, defaultName));
}
isStatic(node) {
if (t.isThisExpression(node) || t.isSuper(node)) {
return true;
}
if (t.isIdentifier(node)) {
const binding = this.getBinding(node.name);
if (binding) {
return binding.constant;
} else {
return this.hasBinding(node.name);
}
}
return false;
}
maybeGenerateMemoised(node, dontPush) {
if (this.isStatic(node)) {
return null;
} else {
const id = this.generateUidIdentifierBasedOnNode(node);
if (!dontPush) {
this.push({
id
});
return t.cloneNode(id);
}
return id;
}
}
checkBlockScopedCollisions(local, kind, name, id) {
if (kind === "param") return;
if (local.kind === "local") return;
const duplicate = kind === "let" || local.kind === "let" || local.kind === "const" || local.kind === "module" || local.kind === "param" && (kind === "let" || kind === "const");
if (duplicate) {
throw this.hub.buildError(id, `Duplicate declaration "${name}"`, TypeError);
}
}
rename(oldName, newName, block) {
const binding = this.getBinding(oldName);
if (binding) {
newName = newName || this.generateUidIdentifier(oldName).name;
return new _renamer.default(binding, oldName, newName).rename(block);
}
}
_renameFromMap(map, oldName, newName, value) {
if (map[oldName]) {
map[newName] = value;
map[oldName] = null;
}
}
dump() {
const sep = "-".repeat(60);
console.log(sep);
let scope = this;
do {
console.log("#", scope.block.type);
for (const name of Object.keys(scope.bindings)) {
const binding = scope.bindings[name];
console.log(" -", name, {
constant: binding.constant,
references: binding.references,
violations: binding.constantViolations.length,
kind: binding.kind
});
}
} while (scope = scope.parent);
console.log(sep);
}
toArray(node, i, allowArrayLike) {
if (t.isIdentifier(node)) {
const binding = this.getBinding(node.name);
if ((binding == null ? void 0 : binding.constant) && binding.path.isGenericType("Array")) {
return node;
}
}
if (t.isArrayExpression(node)) {
return node;
}
if (t.isIdentifier(node, {
name: "arguments"
})) {
return t.callExpression(t.memberExpression(t.memberExpression(t.memberExpression(t.identifier("Array"), t.identifier("prototype")), t.identifier("slice")), t.identifier("call")), [node]);
}
let helperName;
const args = [node];
if (i === true) {
helperName = "toConsumableArray";
} else if (i) {
args.push(t.numericLiteral(i));
helperName = "slicedToArray";
} else {
helperName = "toArray";
}
if (allowArrayLike) {
args.unshift(this.hub.addHelper(helperName));
helperName = "maybeArrayLike";
}
return t.callExpression(this.hub.addHelper(helperName), args);
}
hasLabel(name) {
return !!this.getLabel(name);
}
getLabel(name) {
return this.labels.get(name);
}
registerLabel(path) {
this.labels.set(path.node.label.name, path);
}
registerDeclaration(path) {
if (path.isLabeledStatement()) {
this.registerLabel(path);
} else if (path.isFunctionDeclaration()) {
this.registerBinding("hoisted", path.get("id"), path);
} else if (path.isVariableDeclaration()) {
const declarations = path.get("declarations");
for (const declar of declarations) {
this.registerBinding(path.node.kind, declar);
}
} else if (path.isClassDeclaration()) {
this.registerBinding("let", path);
} else if (path.isImportDeclaration()) {
const specifiers = path.get("specifiers");
for (const specifier of specifiers) {
this.registerBinding("module", specifier);
}
} else if (path.isExportDeclaration()) {
const declar = path.get("declaration");
if (declar.isClassDeclaration() || declar.isFunctionDeclaration() || declar.isVariableDeclaration()) {
this.registerDeclaration(declar);
}
} else {
this.registerBinding("unknown", path);
}
}
buildUndefinedNode() {
return t.unaryExpression("void", t.numericLiteral(0), true);
}
registerConstantViolation(path) {
const ids = path.getBindingIdentifiers();
for (const name of Object.keys(ids)) {
const binding = this.getBinding(name);
if (binding) binding.reassign(path);
}
}
registerBinding(kind, path, bindingPath = path) {
if (!kind) throw new ReferenceError("no `kind`");
if (path.isVariableDeclaration()) {
const declarators = path.get("declarations");
for (const declar of declarators) {
this.registerBinding(kind, declar);
}
return;
}
const parent = this.getProgramParent();
const ids = path.getOuterBindingIdentifiers(true);
for (const name of Object.keys(ids)) {
parent.references[name] = true;
for (const id of ids[name]) {
const local = this.getOwnBinding(name);
if (local) {
if (local.identifier === id) continue;
this.checkBlockScopedCollisions(local, kind, name, id);
}
if (local) {
this.registerConstantViolation(bindingPath);
} else {
this.bindings[name] = new _binding.default({
identifier: id,
scope: this,
path: bindingPath,
kind: kind
});
}
}
}
}
addGlobal(node) {
this.globals[node.name] = node;
}
hasUid(name) {
let scope = this;
do {
if (scope.uids[name]) return true;
} while (scope = scope.parent);
return false;
}
hasGlobal(name) {
let scope = this;
do {
if (scope.globals[name]) return true;
} while (scope = scope.parent);
return false;
}
hasReference(name) {
return !!this.getProgramParent().references[name];
}
isPure(node, constantsOnly) {
if (t.isIdentifier(node)) {
const binding = this.getBinding(node.name);
if (!binding) return false;
if (constantsOnly) return binding.constant;
return true;
} else if (t.isClass(node)) {
if (node.superClass && !this.isPure(node.superClass, constantsOnly)) {
return false;
}
return this.isPure(node.body, constantsOnly);
} else if (t.isClassBody(node)) {
for (const method of node.body) {
if (!this.isPure(method, constantsOnly)) return false;
}
return true;
} else if (t.isBinary(node)) {
return this.isPure(node.left, constantsOnly) && this.isPure(node.right, constantsOnly);
} else if (t.isArrayExpression(node)) {
for (const elem of node.elements) {
if (!this.isPure(elem, constantsOnly)) return false;
}
return true;
} else if (t.isObjectExpression(node)) {
for (const prop of node.properties) {
if (!this.isPure(prop, constantsOnly)) return false;
}
return true;
} else if (t.isMethod(node)) {
if (node.computed && !this.isPure(node.key, constantsOnly)) return false;
if (node.kind === "get" || node.kind === "set") return false;
return true;
} else if (t.isProperty(node)) {
if (node.computed && !this.isPure(node.key, constantsOnly)) return false;
return this.isPure(node.value, constantsOnly);
} else if (t.isUnaryExpression(node)) {
return this.isPure(node.argument, constantsOnly);
} else if (t.isTaggedTemplateExpression(node)) {
return t.matchesPattern(node.tag, "String.raw") && !this.hasBinding("String", true) && this.isPure(node.quasi, constantsOnly);
} else if (t.isTemplateLiteral(node)) {
for (const expression of node.expressions) {
if (!this.isPure(expression, constantsOnly)) return false;
}
return true;
} else {
return t.isPureish(node);
}
}
setData(key, val) {
return this.data[key] = val;
}
getData(key) {
let scope = this;
do {
const data = scope.data[key];
if (data != null) return data;
} while (scope = scope.parent);
}
removeData(key) {
let scope = this;
do {
const data = scope.data[key];
if (data != null) scope.data[key] = null;
} while (scope = scope.parent);
}
init() {
if (!this.inited) {
this.inited = true;
this.crawl();
}
}
crawl() {
const path = this.path;
this.references = Object.create(null);
this.bindings = Object.create(null);
this.globals = Object.create(null);
this.uids = Object.create(null);
this.data = Object.create(null);
if (path.isFunction()) {
if (path.isFunctionExpression() && path.has("id") && !path.get("id").node[t.NOT_LOCAL_BINDING]) {
this.registerBinding("local", path.get("id"), path);
}
const params = path.get("params");
for (const param of params) {
this.registerBinding("param", param);
}
}
const programParent = this.getProgramParent();
if (programParent.crawling) return;
const state = {
references: [],
constantViolations: [],
assignments: []
};
this.crawling = true;
path.traverse(collectorVisitor, state);
this.crawling = false;
for (const path of state.assignments) {
const ids = path.getBindingIdentifiers();
for (const name of Object.keys(ids)) {
if (path.scope.getBinding(name)) continue;
programParent.addGlobal(ids[name]);
}
path.scope.registerConstantViolation(path);
}
for (const ref of state.references) {
const binding = ref.scope.getBinding(ref.node.name);
if (binding) {
binding.reference(ref);
} else {
programParent.addGlobal(ref.node);
}
}
for (const path of state.constantViolations) {
path.scope.registerConstantViolation(path);
}
}
push(opts) {
let path = this.path;
if (!path.isBlockStatement() && !path.isProgram()) {
path = this.getBlockParent().path;
}
if (path.isSwitchStatement()) {
path = (this.getFunctionParent() || this.getProgramParent()).path;
}
if (path.isLoop() || path.isCatchClause() || path.isFunction()) {
path.ensureBlock();
path = path.get("body");
}
const unique = opts.unique;
const kind = opts.kind || "var";
const blockHoist = opts._blockHoist == null ? 2 : opts._blockHoist;
const dataKey = `declaration:${kind}:${blockHoist}`;
let declarPath = !unique && path.getData(dataKey);
if (!declarPath) {
const declar = t.variableDeclaration(kind, []);
declar._blockHoist = blockHoist;
[declarPath] = path.unshiftContainer("body", [declar]);
if (!unique) path.setData(dataKey, declarPath);
}
const declarator = t.variableDeclarator(opts.id, opts.init);
declarPath.node.declarations.push(declarator);
this.registerBinding(kind, declarPath.get("declarations").pop());
}
getProgramParent() {
let scope = this;
do {
if (scope.path.isProgram()) {
return scope;
}
} while (scope = scope.parent);
throw new Error("Couldn't find a Program");
}
getFunctionParent() {
let scope = this;
do {
if (scope.path.isFunctionParent()) {
return scope;
}
} while (scope = scope.parent);
return null;
}
getBlockParent() {
let scope = this;
do {
if (scope.path.isBlockParent()) {
return scope;
}
} while (scope = scope.parent);
throw new Error("We couldn't find a BlockStatement, For, Switch, Function, Loop or Program...");
}
getAllBindings() {
const ids = Object.create(null);
let scope = this;
do {
for (const key of Object.keys(scope.bindings)) {
if (key in ids === false) {
ids[key] = scope.bindings[key];
}
}
scope = scope.parent;
} while (scope);
return ids;
}
getAllBindingsOfKind() {
const ids = Object.create(null);
for (const kind of arguments) {
let scope = this;
do {
for (const name of Object.keys(scope.bindings)) {
const binding = scope.bindings[name];
if (binding.kind === kind) ids[name] = binding;
}
scope = scope.parent;
} while (scope);
}
return ids;
}
bindingIdentifierEquals(name, node) {
return this.getBindingIdentifier(name) === node;
}
getBinding(name) {
let scope = this;
let previousPath;
do {
const binding = scope.getOwnBinding(name);
if (binding) {
var _previousPath;
if (((_previousPath = previousPath) == null ? void 0 : _previousPath.isPattern()) && binding.kind !== "param") {} else {
return binding;
}
}
previousPath = scope.path;
} while (scope = scope.parent);
}
getOwnBinding(name) {
return this.bindings[name];
}
getBindingIdentifier(name) {
var _this$getBinding;
return (_this$getBinding = this.getBinding(name)) == null ? void 0 : _this$getBinding.identifier;
}
getOwnBindingIdentifier(name) {
const binding = this.bindings[name];
return binding == null ? void 0 : binding.identifier;
}
hasOwnBinding(name) {
return !!this.getOwnBinding(name);
}
hasBinding(name, noGlobals) {
if (!name) return false;
if (this.hasOwnBinding(name)) return true;
if (this.parentHasBinding(name, noGlobals)) return true;
if (this.hasUid(name)) return true;
if (!noGlobals && Scope.globals.includes(name)) return true;
if (!noGlobals && Scope.contextVariables.includes(name)) return true;
return false;
}
parentHasBinding(name, noGlobals) {
var _this$parent;
return (_this$parent = this.parent) == null ? void 0 : _this$parent.hasBinding(name, noGlobals);
}
moveBindingTo(name, scope) {
const info = this.getBinding(name);
if (info) {
info.scope.removeOwnBinding(name);
info.scope = scope;
scope.bindings[name] = info;
}
}
removeOwnBinding(name) {
delete this.bindings[name];
}
removeBinding(name) {
var _this$getBinding2;
(_this$getBinding2 = this.getBinding(name)) == null ? void 0 : _this$getBinding2.scope.removeOwnBinding(name);
let scope = this;
do {
if (scope.uids[name]) {
scope.uids[name] = false;
}
} while (scope = scope.parent);
}
}
exports.default = Scope;
Scope.globals = Object.keys(_globals.default.builtin);
Scope.contextVariables = ["arguments", "undefined", "Infinity", "NaN"];

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