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/* -*- indent-tabs-mode: nil; js-indent-level: 2; js-indent-level: 2 -*- */
/* vim: set ft=javascript ts=2 et sw=2 tw=80: */
/* 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 { ActorClassWithSpec } = require("devtools/shared/protocol");
const { createValueGrip } = require("devtools/server/actors/object");
const { environmentSpec } = require("devtools/shared/specs/environment");
/**
* 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.
*/
let EnvironmentActor = ActorClassWithSpec(environmentSpec, {
initialize: function (environment, threadActor) {
this.obj = environment;
this.threadActor = threadActor;
},
/**
* Return an environment form for use in a protocol message.
*/
form: function () {
let form = { actor: this.actorID };
// What is this environment's type?
if (this.obj.type == "declarative") {
form.type = this.obj.callee ? "function" : "block";
} else {
form.type = this.obj.type;
}
// Does this environment have a parent?
if (this.obj.parent) {
form.parent = (this.threadActor
.createEnvironmentActor(this.obj.parent,
this.registeredPool)
.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.registeredPool, this.threadActor.objectGrip);
}
// Is this the environment created for a function call?
if (this.obj.callee) {
form.function = createValueGrip(this.obj.callee,
this.registeredPool, this.threadActor.objectGrip);
}
// Shall we list this environment's bindings?
if (this.obj.type == "declarative") {
form.bindings = this.bindings();
}
return form;
},
/**
* Handle a protocol request to change the value of a variable bound in this
* lexical environment.
*
* @param string name
* The name of the variable to be changed.
* @param any value
* The value to be assigned.
*/
assign: function (name, value) {
// TODO: enable the commented-out part when getVariableDescriptor lands
// (bug 725815).
/* let desc = this.obj.getVariableDescriptor(name);
if (!desc.writable) {
return { error: "immutableBinding",
message: "Changing the value of an immutable binding is not " +
"allowed" };
}*/
try {
this.obj.setVariable(name, value);
} catch (e) {
if (e instanceof Debugger.DebuggeeWouldRun) {
throw {
error: "threadWouldRun",
message: "Assigning a value would cause the debuggee to run"
};
} else {
throw e;
}
}
return { from: this.actorID };
},
/**
* Handle a protocol request to fully enumerate the bindings introduced by the
* lexical environment.
*/
bindings: function () {
let 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.callee) {
parameterNames = this.obj.callee.parameterNames;
} else {
parameterNames = [];
}
for (let name of parameterNames) {
let arg = {};
let value = this.obj.getVariable(name);
// TODO: this part should be removed in favor of the commented-out part
// below when getVariableDescriptor lands (bug 725815).
let desc = {
value: value,
configurable: false,
writable: !(value && value.optimizedOut),
enumerable: true
};
// let desc = this.obj.getVariableDescriptor(name);
let descForm = {
enumerable: true,
configurable: desc.configurable
};
if ("value" in desc) {
descForm.value = createValueGrip(desc.value,
this.registeredPool, this.threadActor.objectGrip);
descForm.writable = desc.writable;
} else {
descForm.get = createValueGrip(desc.get, this.registeredPool,
this.threadActor.objectGrip);
descForm.set = createValueGrip(desc.set, this.registeredPool,
this.threadActor.objectGrip);
}
arg[name] = descForm;
bindings.arguments.push(arg);
}
for (let name of this.obj.names()) {
if (bindings.arguments.some(function exists(element) {
return !!element[name];
})) {
continue;
}
let value = this.obj.getVariable(name);
// TODO: this part should be removed in favor of the commented-out part
// below when getVariableDescriptor lands.
let desc = {
value: value,
configurable: false,
writable: !(value &&
(value.optimizedOut ||
value.uninitialized ||
value.missingArguments)),
enumerable: true
};
// let desc = this.obj.getVariableDescriptor(name);
let descForm = {
enumerable: true,
configurable: desc.configurable
};
if ("value" in desc) {
descForm.value = createValueGrip(desc.value,
this.registeredPool, this.threadActor.objectGrip);
descForm.writable = desc.writable;
} else {
descForm.get = createValueGrip(desc.get || undefined,
this.registeredPool, this.threadActor.objectGrip);
descForm.set = createValueGrip(desc.set || undefined,
this.registeredPool, this.threadActor.objectGrip);
}
bindings.variables[name] = descForm;
}
return bindings;
}
});
exports.EnvironmentActor = EnvironmentActor;
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