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define(function(require, exports, module) {
"use strict";
var spromise = require("libs/js/spromise");
var TernDemo = require("TernDemo"),
Settings = require("Settings"),
globalSettingsTxt = require("text!./tern/.tern-project"),
globalSettings = {};
var projectSettings = Settings();
globalSettings = JSON.parse(globalSettingsTxt||"{}");
// Free memory
globalSettingsTxt=null;
function getWorker(provider) {
if ( getWorker.worker ) {
return getWorker.worker;
}
// Create worker thread to process tern requests.
var worker = getWorker.worker = new Worker( module.uri.substr(0, module.uri.lastIndexOf("/")) + "/TernWorker.js" );
var current = null,
pending = null;
worker.onmessage = function(e) {
var data = e.data;
// If tern requests a file, then we will load it and then send it back to
// tern as an addFile action.
if (data.type === "getFile") {
provider.getFile(data.name)
.done(function(text){
worker.send({
type: "addFile",
text: text,
id: data.id
});
})
.fail(function(error) {
worker.send({
type: "addFile",
err: String(error),
id: data.id
});
});
}
else if (data.type === "debug") {
console.log(data.message);
}
else if (current) {
current.deferred.resolve(data);
}
};
worker.onerror = function(e) {
if ( current ) {
current.deferred.reject(e);
}
};
worker.send = function send(data, callback) {
// Some requests to tern dont need to be waited on... So, just send tern
// the message and exit out.
if (!callback) {
worker.postMessage(data);
return;
}
// If there is already a pending request, we will basically invalidate that
// request and queue up the incoming new one... What this will do is that it
// will make make sure we are only processing the first and last request for
// hints. Anything in the middle isn't as important because we are generally
// interested in the very last input to properly show which hints are available
// at the time the user stops typing. Keeping track of the first request allows
// me to make sure I don't flood tern with requests.
if ( pending ) {
pending.deferred.resolve();
}
// New request
pending = {
data: data,
deferred: spromise.defer()
};
if ( current && current.deferred.state() === "pending" ) {
return pending.deferred.then( resolvePending );
}
else {
current = pending;
pending = null;
worker.postMessage(data);
return current.deferred.then( resolvePending );
}
};
function resolvePending(response) {
// Send the last pending request
if ( pending ) {
current = pending;
pending = null;
worker.postMessage(current.data);
}
else {
current = null;
}
return response.body;
}
return worker;
}
function init(provider) {
var worker = getWorker(provider);
var instance = {
send: worker.send,
loadSettings: LocalServer.loadSettings,
clear: function() {
worker.send({
type: "clear"
});
},
addFile: function(name, text) {
worker.send({
type: "addFile",
name: name,
text: text
});
},
deleleteFile: function(name) {
worker.send({
type: "deleteFile",
name: name
});
},
request: function(body) {
return worker.send({
type: "request",
body: body
}, true);
}
};
// Init with empty settings. Until a document is open that can give us
// some context...
worker.send({
type: "init",
body: {}
});
// Call TernDemo and extend the instance.
return $.extend(instance, TernDemo(instance));
}
function loadSettings( settings ) {
var worker = getWorker(LocalServer.provider);
settings = settings || $.extend({}, globalSettings);
if ( settings === currentSettings ) {
return;
}
currentSettings = settings;
settings.libs = $.map(settings.libs || [], function(item) {
return "text!./tern/defs/" + item + ".json";
});
require(settings.libs, function() {
settings.defs = $.map(arguments, function(item) {
return JSON.parse(item);
});
// Post an init message to load settings
worker.send({
type: "init",
body: settings
});
});
}
var currentSettings;
LocalServer.loadSettings = function(cm, fullPath) {
projectSettings
.load(".tern-project", fullPath)
.done(loadSettings)
.fail(function() {loadSettings();});
};
/**
* Bridge to communicate into tern worker thread.
*/
function LocalServer(provider) {
LocalServer.provider = provider;
return spromise(function(resolve) {
resolve(init(provider));
});
}
return LocalServer;
});