gecko-dev/devtools/shared/client/object-client.js

/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const {arg, DebuggerClient} = require("devtools/shared/client/debugger-client");
loader.lazyRequireGetter(this, "PropertyIteratorClient", "devtools/shared/client/property-iterator-client");
loader.lazyRequireGetter(this, "SymbolIteratorClient", "devtools/shared/client/symbol-iterator-client");

/**
 * Grip clients are used to retrieve information about the relevant object.
 *
 * @param client DebuggerClient
 *        The debugger client parent.
 * @param grip object
 *        A pause-lifetime object grip returned by the protocol.
 */
function ObjectClient(client, grip) {
  this._grip = grip;
  this._client = client;
  this.request = this._client.request;
}

ObjectClient.prototype = {
  get actor() {
    return this._grip.actor;
  },
  get _transport() {
    return this._client._transport;
  },

  valid: true,

  get isFrozen() {
    return this._grip.frozen;
  },
  get isSealed() {
    return this._grip.sealed;
  },
  get isExtensible() {
    return this._grip.extensible;
  },

  getDefinitionSite: DebuggerClient.requester({
    type: "definitionSite"
  }, {
    before: function(packet) {
      if (this._grip.class != "Function") {
        throw new Error("getDefinitionSite is only valid for function grips.");
      }
      return packet;
    }
  }),

  /**
   * Request the names of a function's formal parameters.
   *
   * @param onResponse function
   *        Called with an object of the form:
   *        { parameterNames:[<parameterName>, ...] }
   *        where each <parameterName> is the name of a parameter.
   */
  getParameterNames: DebuggerClient.requester({
    type: "parameterNames"
  }, {
    before: function(packet) {
      if (this._grip.class !== "Function") {
        throw new Error("getParameterNames is only valid for function grips.");
      }
      return packet;
    },
  }),

  /**
   * Request the names of the properties defined on the object and not its
   * prototype.
   *
   * @param onResponse function Called with the request's response.
   */
  getOwnPropertyNames: DebuggerClient.requester({
    type: "ownPropertyNames"
  }),

  /**
   * Request the prototype and own properties of the object.
   *
   * @param onResponse function Called with the request's response.
   */
  getPrototypeAndProperties: DebuggerClient.requester({
    type: "prototypeAndProperties"
  }),

  /**
   * Request a PropertyIteratorClient instance to ease listing
   * properties for this object.
   *
   * @param options Object
   *        A dictionary object with various boolean attributes:
   *        - ignoreIndexedProperties Boolean
   *          If true, filters out Array items.
   *          e.g. properties names between `0` and `object.length`.
   *        - ignoreNonIndexedProperties Boolean
   *          If true, filters out items that aren't array items
   *          e.g. properties names that are not a number between `0`
   *          and `object.length`.
   *        - sort Boolean
   *          If true, the iterator will sort the properties by name
   *          before dispatching them.
   * @param onResponse function Called with the client instance.
   */
  enumProperties: DebuggerClient.requester({
    type: "enumProperties",
    options: arg(0)
  }, {
    after: function(response) {
      if (response.iterator) {
        return { iterator: new PropertyIteratorClient(this._client, response.iterator) };
      }
      return response;
    },
  }),

  /**
   * Request a PropertyIteratorClient instance to enumerate entries in a
   * Map/Set-like object.
   *
   * @param onResponse function Called with the request's response.
   */
  enumEntries: DebuggerClient.requester({
    type: "enumEntries"
  }, {
    before: function(packet) {
      if (!["Map", "WeakMap", "Set", "WeakSet", "Storage"].includes(this._grip.class)) {
        throw new Error("enumEntries is only valid for Map/Set/Storage-like grips.");
      }
      return packet;
    },
    after: function(response) {
      if (response.iterator) {
        return {
          iterator: new PropertyIteratorClient(this._client, response.iterator)
        };
      }
      return response;
    }
  }),

  /**
   * Request a SymbolIteratorClient instance to enumerate symbols in an object.
   *
   * @param onResponse function Called with the request's response.
   */
  enumSymbols: DebuggerClient.requester({
    type: "enumSymbols"
  }, {
    before: function(packet) {
      if (this._grip.type !== "object") {
        throw new Error("enumSymbols is only valid for objects grips.");
      }
      return packet;
    },
    after: function(response) {
      if (response.iterator) {
        return {
          iterator: new SymbolIteratorClient(this._client, response.iterator)
        };
      }
      return response;
    }
  }),

  /**
   * Request the property descriptor of the object's specified property.
   *
   * @param name string The name of the requested property.
   * @param onResponse function Called with the request's response.
   */
  getProperty: DebuggerClient.requester({
    type: "property",
    name: arg(0)
  }),

  /**
   * Request the prototype of the object.
   *
   * @param onResponse function Called with the request's response.
   */
  getPrototype: DebuggerClient.requester({
    type: "prototype"
  }),

  /**
   * Request the display string of the object.
   *
   * @param onResponse function Called with the request's response.
   */
  getDisplayString: DebuggerClient.requester({
    type: "displayString"
  }),

  /**
   * Request the scope of the object.
   *
   * @param onResponse function Called with the request's response.
   */
  getScope: DebuggerClient.requester({
    type: "scope"
  }, {
    before: function(packet) {
      if (this._grip.class !== "Function") {
        throw new Error("scope is only valid for function grips.");
      }
      return packet;
    },
  }),

  /**
   * Request the promises directly depending on the current promise.
   */
  getDependentPromises: DebuggerClient.requester({
    type: "dependentPromises"
  }, {
    before: function(packet) {
      if (this._grip.class !== "Promise") {
        throw new Error("getDependentPromises is only valid for promise " +
          "grips.");
      }
      return packet;
    }
  }),

  /**
   * Request the stack to the promise's allocation point.
   */
  getPromiseAllocationStack: DebuggerClient.requester({
    type: "allocationStack"
  }, {
    before: function(packet) {
      if (this._grip.class !== "Promise") {
        throw new Error("getAllocationStack is only valid for promise grips.");
      }
      return packet;
    }
  }),

  /**
   * Request the stack to the promise's fulfillment point.
   */
  getPromiseFulfillmentStack: DebuggerClient.requester({
    type: "fulfillmentStack"
  }, {
    before: function(packet) {
      if (this._grip.class !== "Promise") {
        throw new Error("getPromiseFulfillmentStack is only valid for " +
          "promise grips.");
      }
      return packet;
    }
  }),

  /**
   * Request the stack to the promise's rejection point.
   */
  getPromiseRejectionStack: DebuggerClient.requester({
    type: "rejectionStack"
  }, {
    before: function(packet) {
      if (this._grip.class !== "Promise") {
        throw new Error("getPromiseRejectionStack is only valid for " +
          "promise grips.");
      }
      return packet;
    }
  })
};

module.exports = ObjectClient;