88 lines
2.3 KiB
JavaScript
88 lines
2.3 KiB
JavaScript
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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"use strict";
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const protocol = require("devtools/shared/protocol");
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const {Arg, RetVal, generateActorSpec} = protocol;
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const promise = require("promise");
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const {Class} = require("sdk/core/heritage");
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const longStringSpec = generateActorSpec({
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typeName: "longstractor",
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methods: {
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substring: {
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request: {
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start: Arg(0),
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end: Arg(1)
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},
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response: { substring: RetVal() },
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},
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release: { release: true },
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},
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});
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exports.longStringSpec = longStringSpec;
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/**
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* When a caller is expecting a LongString actor but the string is already available on
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* client, the SimpleStringFront can be used as it shares the same API as a
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* LongStringFront but will not make unnecessary trips to the server.
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*/
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const SimpleStringFront = Class({
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initialize: function (str) {
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this.str = str;
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},
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get length() {
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return this.str.length;
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},
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get initial() {
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return this.str;
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},
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string: function () {
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return promise.resolve(this.str);
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},
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substring: function (start, end) {
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return promise.resolve(this.str.substring(start, end));
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},
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release: function () {
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this.str = null;
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return promise.resolve(undefined);
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}
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});
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exports.SimpleStringFront = SimpleStringFront;
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// The long string actor needs some custom marshalling, because it is sometimes
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// returned as a primitive rather than a complete form.
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var stringActorType = protocol.types.getType("longstractor");
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protocol.types.addType("longstring", {
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_actor: true,
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write: (value, context, detail) => {
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if (!(context instanceof protocol.Actor)) {
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throw Error("Passing a longstring as an argument isn't supported.");
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}
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if (value.short) {
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return value.str;
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}
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return stringActorType.write(value, context, detail);
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},
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read: (value, context, detail) => {
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if (context instanceof protocol.Actor) {
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throw Error("Passing a longstring as an argument isn't supported.");
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}
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if (typeof (value) === "string") {
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return new SimpleStringFront(value);
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}
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return stringActorType.read(value, context, detail);
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}
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});
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