index.js

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.skipAllButComputedKey = skipAllButComputedKey;
exports.default = exports.environmentVisitor = void 0;

var _traverse = _interopRequireDefault(require("@babel/traverse"));

var _helperMemberExpressionToFunctions = _interopRequireDefault(require("@babel/helper-member-expression-to-functions"));

var _helperOptimiseCallExpression = _interopRequireDefault(require("@babel/helper-optimise-call-expression"));

var t = _interopRequireWildcard(require("@babel/types"));

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 getPrototypeOfExpression(objectRef, isStatic, file, isPrivateMethod) {
  objectRef = t.cloneNode(objectRef);
  const targetRef = isStatic || isPrivateMethod ? objectRef : t.memberExpression(objectRef, t.identifier("prototype"));
  return t.callExpression(file.addHelper("getPrototypeOf"), [targetRef]);
}

function skipAllButComputedKey(path) {
  if (!path.node.computed) {
    path.skip();
    return;
  }

  const keys = t.VISITOR_KEYS[path.type];

  for (const key of keys) {
    if (key !== "key") path.skipKey(key);
  }
}

const environmentVisitor = {
  TypeAnnotation(path) {
    path.skip();
  },

  Function(path) {
    if (path.isMethod()) return;
    if (path.isArrowFunctionExpression()) return;
    path.skip();
  },

  "Method|ClassProperty|ClassPrivateProperty"(path) {
    skipAllButComputedKey(path);
  }

};
exports.environmentVisitor = environmentVisitor;

const visitor = _traverse.default.visitors.merge([environmentVisitor, {
  Super(path, state) {
    const {
      node,
      parentPath
    } = path;
    if (!parentPath.isMemberExpression({
      object: node
    })) return;
    state.handle(parentPath);
  }

}]);

const specHandlers = {
  memoise(superMember, count) {
    const {
      scope,
      node
    } = superMember;
    const {
      computed,
      property
    } = node;

    if (!computed) {
      return;
    }

    const memo = scope.maybeGenerateMemoised(property);

    if (!memo) {
      return;
    }

    this.memoiser.set(property, memo, count);
  },

  prop(superMember) {
    const {
      computed,
      property
    } = superMember.node;

    if (this.memoiser.has(property)) {
      return t.cloneNode(this.memoiser.get(property));
    }

    if (computed) {
      return t.cloneNode(property);
    }

    return t.stringLiteral(property.name);
  },

  get(superMember) {
    return t.callExpression(this.file.addHelper("get"), [getPrototypeOfExpression(this.getObjectRef(), this.isStatic, this.file, this.isPrivateMethod), this.prop(superMember), t.thisExpression()]);
  },

  set(superMember, value) {
    return t.callExpression(this.file.addHelper("set"), [getPrototypeOfExpression(this.getObjectRef(), this.isStatic, this.file, this.isPrivateMethod), this.prop(superMember), value, t.thisExpression(), t.booleanLiteral(superMember.isInStrictMode())]);
  },

  destructureSet(superMember) {
    throw superMember.buildCodeFrameError(`Destructuring to a super field is not supported yet.`);
  },

  call(superMember, args) {
    return (0, _helperOptimiseCallExpression.default)(this.get(superMember), t.thisExpression(), args);
  }

};
const looseHandlers = Object.assign({}, specHandlers, {
  prop(superMember) {
    const {
      property
    } = superMember.node;

    if (this.memoiser.has(property)) {
      return t.cloneNode(this.memoiser.get(property));
    }

    return t.cloneNode(property);
  },

  get(superMember) {
    const {
      isStatic,
      superRef
    } = this;
    const {
      computed
    } = superMember.node;
    const prop = this.prop(superMember);
    let object;

    if (isStatic) {
      object = superRef ? t.cloneNode(superRef) : t.memberExpression(t.identifier("Function"), t.identifier("prototype"));
    } else {
      object = superRef ? t.memberExpression(t.cloneNode(superRef), t.identifier("prototype")) : t.memberExpression(t.identifier("Object"), t.identifier("prototype"));
    }

    return t.memberExpression(object, prop, computed);
  },

  set(superMember, value) {
    const {
      computed
    } = superMember.node;
    const prop = this.prop(superMember);
    return t.assignmentExpression("=", t.memberExpression(t.thisExpression(), prop, computed), value);
  },

  destructureSet(superMember) {
    const {
      computed
    } = superMember.node;
    const prop = this.prop(superMember);
    return t.memberExpression(t.thisExpression(), prop, computed);
  }

});

class ReplaceSupers {
  constructor(opts) {
    const path = opts.methodPath;
    this.methodPath = path;
    this.isStatic = path.isObjectMethod() || path.node.static;
    this.isPrivateMethod = path.isPrivate() && path.isMethod();
    this.file = opts.file;
    this.superRef = opts.superRef;
    this.isLoose = opts.isLoose;
    this.opts = opts;
  }

  getObjectRef() {
    return t.cloneNode(this.opts.objectRef || this.opts.getObjectRef());
  }

  replace() {
    const handler = this.isLoose ? looseHandlers : specHandlers;
    (0, _helperMemberExpressionToFunctions.default)(this.methodPath, visitor, Object.assign({
      file: this.file,
      isStatic: this.isStatic,
      isPrivateMethod: this.isPrivateMethod,
      getObjectRef: this.getObjectRef.bind(this),
      superRef: this.superRef
    }, handler));
  }

}

exports.default = ReplaceSupers;