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/* 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 { Actor } = require("resource://devtools/shared/protocol.js");
const {
environmentSpec,
} = require("resource://devtools/shared/specs/environment.js");
const {
createValueGrip,
} = require("resource://devtools/server/actors/object/utils.js");
/**
* Creates an EnvironmentActor. EnvironmentActors are responsible for listing
* the bindings introduced by a lexical environment and assigning new values to
* those identifier bindings.
*
* @param Debugger.Environment aEnvironment
* The lexical environment that will be used to create the actor.
* @param ThreadActor aThreadActor
* The parent thread actor that contains this environment.
*/
class EnvironmentActor extends Actor {
constructor(environment, threadActor) {
super(threadActor.conn, environmentSpec);
this.obj = environment;
this.threadActor = threadActor;
}
/**
* When the Environment Actor is destroyed it removes the
* Debugger.Environment.actor field so that environment does not
* reference a destroyed actor.
*/
destroy() {
this.obj.actor = null;
super.destroy();
}
/**
* Return an environment form for use in a protocol message.
*/
form() {
const form = { actor: this.actorID };
// What is this environment's type?
if (this.obj.type == "declarative") {
form.type = this.obj.calleeScript ? "function" : "block";
} else {
form.type = this.obj.type;
}
form.scopeKind = this.obj.scopeKind;
// Does this environment have a parent?
if (this.obj.parent) {
form.parent = this.threadActor
.createEnvironmentActor(this.obj.parent, this.getParent())
.form();
}
// Does this environment reflect the properties of an object as variables?
if (this.obj.type == "object" || this.obj.type == "with") {
form.object = createValueGrip(
this.obj.object,
this.getParent(),
this.threadActor.objectGrip
);
}
// Is this the environment created for a function call?
if (this.obj.calleeScript) {
// Client only uses "displayName" for "function".
// Create a fake object actor containing only "displayName" as replacement
// for the no longer available obj.callee (see bug 1663847).
// See bug 1664218 for cleanup.
form.function = { displayName: this.obj.calleeScript.displayName };
}
// Shall we list this environment's bindings?
if (this.obj.type == "declarative") {
form.bindings = this.bindings();
}
return form;
}
/**
* Handle a protocol request to fully enumerate the bindings introduced by the
* lexical environment.
*/
bindings() {
const bindings = { arguments: [], variables: {} };
// TODO: this part should be removed in favor of the commented-out part
// below when getVariableDescriptor lands (bug 725815).
if (typeof this.obj.getVariable != "function") {
// if (typeof this.obj.getVariableDescriptor != "function") {
return bindings;
}
let parameterNames;
if (this.obj.calleeScript) {
parameterNames = this.obj.calleeScript.parameterNames;
} else {
parameterNames = [];
}
for (const name of parameterNames) {
const arg = {};
const value = this.obj.getVariable(name);
// TODO: this part should be removed in favor of the commented-out part
// below when getVariableDescriptor lands (bug 725815).
const desc = {
value,
configurable: false,
writable: !value?.optimizedOut,
enumerable: true,
};
// let desc = this.obj.getVariableDescriptor(name);
const descForm = {
enumerable: true,
configurable: desc.configurable,
};
if ("value" in desc) {
descForm.value = createValueGrip(
desc.value,
this.getParent(),
this.threadActor.objectGrip
);
descForm.writable = desc.writable;
} else {
descForm.get = createValueGrip(
desc.get,
this.getParent(),
this.threadActor.objectGrip
);
descForm.set = createValueGrip(
desc.set,
this.getParent(),
this.threadActor.objectGrip
);
}
arg[name] = descForm;
bindings.arguments.push(arg);
}
for (const name of this.obj.names()) {
if (
bindings.arguments.some(function exists(element) {
return !!element[name];
})
) {
continue;
}
const value = this.obj.getVariable(name);
// TODO: this part should be removed in favor of the commented-out part
// below when getVariableDescriptor lands.
const desc = {
value,
configurable: false,
writable: !(
value &&
(value.optimizedOut || value.uninitialized || value.missingArguments)
),
enumerable: true,
};
// let desc = this.obj.getVariableDescriptor(name);
const descForm = {
enumerable: true,
configurable: desc.configurable,
};
if ("value" in desc) {
descForm.value = createValueGrip(
desc.value,
this.getParent(),
this.threadActor.objectGrip
);
descForm.writable = desc.writable;
} else {
descForm.get = createValueGrip(
desc.get || undefined,
this.getParent(),
this.threadActor.objectGrip
);
descForm.set = createValueGrip(
desc.set || undefined,
this.getParent(),
this.threadActor.objectGrip
);
}
bindings.variables[name] = descForm;
}
return bindings;
}
}
exports.EnvironmentActor = EnvironmentActor;
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