mirror of https://github.com/apache/druid.git
initial commit
This commit is contained in:
Fangjin Yang
parent
bf0d9c601d
commit
9dbb8841a1
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@ -52,7 +52,8 @@ public class TaskMasterLifecycle
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private final TaskToolbox taskToolbox;
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private volatile boolean leading = false;
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private volatile TaskRunner theRunner;
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private volatile TaskRunner taskRunner;
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private volatile ResourceManagementScheduler resourceManagementScheduler;
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private static final EmittingLogger log = new EmittingLogger(TaskMasterLifecycle.class);
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@ -81,9 +82,8 @@ public class TaskMasterLifecycle
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try {
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log.info("By the power of Grayskull, I have the power!");
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final TaskRunner taskRunner = runnerFactory.build();
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theRunner = taskRunner;
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final ResourceManagementScheduler scheduler = managementSchedulerFactory.build(theRunner);
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taskRunner = runnerFactory.build();
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resourceManagementScheduler = managementSchedulerFactory.build(taskRunner);
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final TaskConsumer taskConsumer = new TaskConsumer(
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taskQueue,
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taskRunner,
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@ -208,7 +208,7 @@ public class TaskMasterLifecycle
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public TaskRunner getTaskRunner()
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{
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return theRunner;
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return taskRunner;
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}
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public TaskQueue getTaskQueue()
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@ -220,4 +220,9 @@ public class TaskMasterLifecycle
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{
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return taskToolbox;
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}
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public ResourceManagementScheduler getResourceManagementScheduler()
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{
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return resourceManagementScheduler;
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}
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}
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@ -19,6 +19,7 @@
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package com.metamx.druid.merger.coordinator;
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import com.fasterxml.jackson.annotation.JsonProperty;
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import com.fasterxml.jackson.databind.ObjectMapper;
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import com.google.common.base.Function;
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import com.google.common.base.Throwables;
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@ -66,11 +67,13 @@ public class ZkWorker implements Closeable
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};
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}
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@JsonProperty
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public Worker getWorker()
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{
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return worker;
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}
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@JsonProperty
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public Set<String> getRunningTasks()
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{
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return Sets.newHashSet(
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@ -86,11 +89,13 @@ public class ZkWorker implements Closeable
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return statusCache;
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}
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@JsonProperty
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public DateTime getLastCompletedTaskTime()
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{
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return lastCompletedTaskTime;
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}
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@JsonProperty
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public boolean isAtCapacity()
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{
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return statusCache.getCurrentData().size() >= worker.getCapacity();
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@ -112,8 +117,6 @@ public class ZkWorker implements Closeable
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{
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return "ZkWorker{" +
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"worker=" + worker +
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", statusCache=" + statusCache +
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", cacheConverter=" + cacheConverter +
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", lastCompletedTaskTime=" + lastCompletedTaskTime +
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'}';
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}
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@ -1,67 +0,0 @@
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/*
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* Druid - a distributed column store.
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* Copyright (C) 2012 Metamarkets Group Inc.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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package com.metamx.druid.merger.coordinator.http;
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import com.google.inject.Inject;
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import com.metamx.common.logger.Logger;
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import com.metamx.druid.merger.coordinator.TaskMasterLifecycle;
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import javax.ws.rs.GET;
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import javax.ws.rs.Path;
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import javax.ws.rs.Produces;
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import javax.ws.rs.core.Response;
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/**
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*/
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@Path("/mmx/merger/v1/info")
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public class IndexerCoordinatorInfoResource
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{
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private static final Logger log = new Logger(IndexerCoordinatorInfoResource.class);
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private final TaskMasterLifecycle taskMasterLifecycle;
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@Inject
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public IndexerCoordinatorInfoResource(TaskMasterLifecycle taskMasterLifecycle)
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{
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this.taskMasterLifecycle = taskMasterLifecycle;
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}
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@GET
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@Path("/pendingTasks}")
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@Produces("application/json")
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public Response getPendingTasks()
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{
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if (taskMasterLifecycle.getTaskRunner() == null) {
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return Response.noContent().build();
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}
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return Response.ok(taskMasterLifecycle.getTaskRunner().getPendingTasks()).build();
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}
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@GET
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@Path("/runningTasks}")
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@Produces("application/json")
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public Response getRunningTasks()
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{
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if (taskMasterLifecycle.getTaskRunner() == null) {
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return Response.noContent().build();
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}
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return Response.ok(taskMasterLifecycle.getTaskRunner().getRunningTasks()).build();
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}
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}
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@ -41,9 +41,11 @@ import com.metamx.common.logger.Logger;
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import com.metamx.druid.RegisteringNode;
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import com.metamx.druid.db.DbConnector;
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import com.metamx.druid.db.DbConnectorConfig;
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import com.metamx.druid.http.ComputeMain;
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import com.metamx.druid.http.GuiceServletConfig;
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import com.metamx.druid.http.RedirectFilter;
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import com.metamx.druid.http.RedirectInfo;
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import com.metamx.druid.http.RedirectServlet;
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import com.metamx.druid.http.StatusServlet;
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import com.metamx.druid.initialization.Initialization;
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import com.metamx.druid.initialization.ServerConfig;
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@ -283,8 +285,12 @@ public class IndexerCoordinatorNode extends RegisteringNode
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)
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);
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final Context root = new Context(server, "/", Context.SESSIONS);
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final Context staticContext = new Context(server, "/static", Context.SESSIONS);
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staticContext.addServlet(new ServletHolder(new DefaultServlet()), "/*");
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staticContext.setResourceBase(IndexerCoordinatorNode.class.getClassLoader().getResource("static").toExternalForm());
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final Context root = new Context(server, "/", Context.SESSIONS);
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root.addServlet(new ServletHolder(new StatusServlet()), "/status");
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root.addServlet(new ServletHolder(new DefaultServlet()), "/mmx/*");
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root.addEventListener(new GuiceServletConfig(injector));
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@ -143,7 +143,11 @@ public class IndexerCoordinatorResource
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final Optional<TaskStatus> status = taskStorageQueryAdapter.getSameGroupMergedStatus(taskid);
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final Set<DataSegment> segments = taskStorageQueryAdapter.getSameGroupNewSegments(taskid);
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final Map<String, Object> ret = jsonMapper.convertValue(status, new TypeReference<Map<String, Object>>(){});
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final Map<String, Object> ret = jsonMapper.convertValue(
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status, new TypeReference<Map<String, Object>>()
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{
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}
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);
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ret.put("segments", segments);
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return Response.ok().entity(ret).build();
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@ -178,4 +182,48 @@ public class IndexerCoordinatorResource
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final T ret = taskMasterLifecycle.getTaskToolbox().getTaskActionClient().submit(action);
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return Response.ok().entity(ret).build();
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}
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@GET
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@Path("/pendingTasks")
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@Produces("application/json")
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public Response getPendingTasks()
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{
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if (taskMasterLifecycle.getTaskRunner() == null) {
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return Response.noContent().build();
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}
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return Response.ok(taskMasterLifecycle.getTaskRunner().getPendingTasks()).build();
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}
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@GET
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@Path("/runningTasks")
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@Produces("application/json")
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public Response getRunningTasks()
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{
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if (taskMasterLifecycle.getTaskRunner() == null) {
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return Response.noContent().build();
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}
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return Response.ok(taskMasterLifecycle.getTaskRunner().getRunningTasks()).build();
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}
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@GET
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@Path("/workers")
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@Produces("application/json")
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public Response getWorkers()
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{
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if (taskMasterLifecycle.getTaskRunner() == null) {
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return Response.noContent().build();
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}
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return Response.ok(taskMasterLifecycle.getTaskRunner().getWorkers()).build();
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}
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@GET
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@Path("/scaling")
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@Produces("application/json")
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public Response getScalingState()
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{
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if (taskMasterLifecycle.getResourceManagementScheduler() == null) {
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return Response.noContent().build();
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}
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return Response.ok(taskMasterLifecycle.getResourceManagementScheduler().getStats()).build();
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}
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}
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@ -64,7 +64,6 @@ public class IndexerCoordinatorServletModule extends JerseyServletModule
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protected void configureServlets()
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{
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bind(IndexerCoordinatorResource.class);
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bind(IndexerCoordinatorInfoResource.class);
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bind(ObjectMapper.class).toInstance(jsonMapper);
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bind(IndexerCoordinatorConfig.class).toInstance(indexerCoordinatorConfig);
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bind(ServiceEmitter.class).toInstance(emitter);
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@ -19,6 +19,8 @@
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package com.metamx.druid.merger.coordinator.scaling;
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import com.fasterxml.jackson.annotation.JsonProperty;
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import java.util.List;
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/**
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@ -34,11 +36,13 @@ public class AutoScalingData<T>
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this.nodes = nodes;
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}
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@JsonProperty
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public List<String> getNodeIds()
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{
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return nodeIds;
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}
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@JsonProperty
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public List<T> getNodes()
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{
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return nodes;
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|
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@ -1,5 +1,6 @@
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package com.metamx.druid.merger.coordinator.scaling;
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import com.fasterxml.jackson.annotation.JsonProperty;
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import com.google.common.collect.Lists;
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import com.google.common.collect.MinMaxPriorityQueue;
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import org.joda.time.DateTime;
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@ -60,6 +61,7 @@ public class ScalingStats
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);
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}
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@JsonProperty
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public List<ScalingEvent> toList()
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{
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List<ScalingEvent> retVal = Lists.newArrayList(recentNodes);
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@ -84,16 +86,19 @@ public class ScalingStats
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this.event = event;
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}
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@JsonProperty
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public AutoScalingData getData()
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{
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return data;
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}
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@JsonProperty
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public DateTime getTimestamp()
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{
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return timestamp;
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}
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@JsonProperty
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public EVENT getEvent()
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{
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return event;
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|
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@ -0,0 +1,46 @@
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
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* HTML
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*/
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|
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body {
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font: 14px Helvetica, Arial, Verdana, sans-serif;
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color: #333;
|
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background-color: #fff;
|
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}
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.container {
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margin: 10px;
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padding: 0 0 20px 0;
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}
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ul {
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list-style: none;
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margin: 0;
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padding: 0;
|
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}
|
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|
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a {
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cursor: pointer;
|
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text-decoration: underline;
|
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margin: 0 5px 0 5px;
|
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color:blue;
|
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}
|
||||
|
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a:visited {
|
||||
color: purple;
|
||||
}
|
||||
|
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a:active {
|
||||
color: red;
|
||||
}
|
||||
|
||||
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
|
||||
* BODY
|
||||
*/
|
||||
|
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.heading {
|
||||
background-color: #232B4A;
|
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color: #FF6000;
|
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padding: 10px;
|
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margin: 10px 0;
|
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}
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Binary file not shown.
|
After Width: | Height: | Size: 1.1 KiB |
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@ -0,0 +1,51 @@
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<!DOCTYPE HTML>
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<!--
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~ Druid - a distributed column store.
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||||
~ Copyright (C) 2012 Metamarkets Group Inc.
|
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~
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||||
~ This program is free software; you can redistribute it and/or
|
||||
~ modify it under the terms of the GNU General Public License
|
||||
~ as published by the Free Software Foundation; either version 2
|
||||
~ of the License, or (at your option) any later version.
|
||||
~
|
||||
~ This program is distributed in the hope that it will be useful,
|
||||
~ but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
~ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
~ GNU General Public License for more details.
|
||||
~
|
||||
~ You should have received a copy of the GNU General Public License
|
||||
~ along with this program; if not, write to the Free Software
|
||||
~ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
||||
-->
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<html>
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<head>
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<title>Druid Indexer Coordinator Console</title>
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<link rel="shortcut icon" type="image/ico" href="images/favicon.ico">
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
|
||||
<meta name="Description" content="Druid Indexer Coordinator Console"/>
|
||||
|
||||
<style type="text/css">@import "css/style.css";</style>
|
||||
|
||||
<script type="text/javascript" src="js/underscore-1.2.2.js"></script>
|
||||
<script type="text/javascript" src="js/jquery-1.8.3.js"></script>
|
||||
<script type="text/javascript" src="js/indexer-0.0.1.js"></script>
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<div class="container">
|
||||
<div class="heading">Coordinator Console</div>
|
||||
<h2>Running Tasks</h2>
|
||||
<div id="runningTasks"></div>
|
||||
|
||||
<h2>Pending Tasks</h2>
|
||||
<div id="pendingTasks"></div>
|
||||
|
||||
<h2>Workers</h2>
|
||||
<div id="workers"></div>
|
||||
|
||||
<h2>Event Log</h2>
|
||||
<div id="events"></div>
|
||||
</div>
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -0,0 +1,17 @@
|
|||
$(document).ready(function() {
|
||||
$.getJSON("/mmx/merger/v1/runningTasks", function(data) {
|
||||
$('#pendingTasks').append('<p>' + JSON.stringify(data) + '</p>');
|
||||
});
|
||||
|
||||
$.getJSON("/mmx/merger/v1/pendingTasks", function(data) {
|
||||
$('#runningTasks').append('<p>' + JSON.stringify(data) + '</p>');
|
||||
});
|
||||
|
||||
$.getJSON("/mmx/merger/v1/workers", function(data) {
|
||||
$('#workers').append('<p>' + JSON.stringify(data) + '</p>');
|
||||
});
|
||||
|
||||
$.getJSON("/mmx/merger/v1/scaling", function(data) {
|
||||
$('#events').append('<p>' + JSON.stringify(data) + '</p>');
|
||||
});
|
||||
});
|
||||
File diff suppressed because it is too large
Load Diff
|
|
@ -0,0 +1,977 @@
|
|||
// Underscore.js 1.2.2
|
||||
// (c) 2011 Jeremy Ashkenas, DocumentCloud Inc.
|
||||
// Underscore is freely distributable under the MIT license.
|
||||
// Portions of Underscore are inspired or borrowed from Prototype,
|
||||
// Oliver Steele's Functional, and John Resig's Micro-Templating.
|
||||
// For all details and documentation:
|
||||
// http://documentcloud.github.com/underscore
|
||||
|
||||
(function() {
|
||||
|
||||
// Baseline setup
|
||||
// --------------
|
||||
|
||||
// Establish the root object, `window` in the browser, or `global` on the server.
|
||||
var root = this;
|
||||
|
||||
// Save the previous value of the `_` variable.
|
||||
var previousUnderscore = root._;
|
||||
|
||||
// Establish the object that gets returned to break out of a loop iteration.
|
||||
var breaker = {};
|
||||
|
||||
// Save bytes in the minified (but not gzipped) version:
|
||||
var ArrayProto = Array.prototype, ObjProto = Object.prototype, FuncProto = Function.prototype;
|
||||
|
||||
// Create quick reference variables for speed access to core prototypes.
|
||||
var slice = ArrayProto.slice,
|
||||
unshift = ArrayProto.unshift,
|
||||
toString = ObjProto.toString,
|
||||
hasOwnProperty = ObjProto.hasOwnProperty;
|
||||
|
||||
// All **ECMAScript 5** native function implementations that we hope to use
|
||||
// are declared here.
|
||||
var
|
||||
nativeForEach = ArrayProto.forEach,
|
||||
nativeMap = ArrayProto.map,
|
||||
nativeReduce = ArrayProto.reduce,
|
||||
nativeReduceRight = ArrayProto.reduceRight,
|
||||
nativeFilter = ArrayProto.filter,
|
||||
nativeEvery = ArrayProto.every,
|
||||
nativeSome = ArrayProto.some,
|
||||
nativeIndexOf = ArrayProto.indexOf,
|
||||
nativeLastIndexOf = ArrayProto.lastIndexOf,
|
||||
nativeIsArray = Array.isArray,
|
||||
nativeKeys = Object.keys,
|
||||
nativeBind = FuncProto.bind;
|
||||
|
||||
// Create a safe reference to the Underscore object for use below.
|
||||
var _ = function(obj) { return new wrapper(obj); };
|
||||
|
||||
// Export the Underscore object for **Node.js** and **"CommonJS"**, with
|
||||
// backwards-compatibility for the old `require()` API. If we're not in
|
||||
// CommonJS, add `_` to the global object.
|
||||
if (typeof exports !== 'undefined') {
|
||||
if (typeof module !== 'undefined' && module.exports) {
|
||||
exports = module.exports = _;
|
||||
}
|
||||
exports._ = _;
|
||||
} else if (typeof define === 'function' && define.amd) {
|
||||
// Register as a named module with AMD.
|
||||
define('underscore', function() {
|
||||
return _;
|
||||
});
|
||||
} else {
|
||||
// Exported as a string, for Closure Compiler "advanced" mode.
|
||||
root['_'] = _;
|
||||
}
|
||||
|
||||
// Current version.
|
||||
_.VERSION = '1.2.2';
|
||||
|
||||
// Collection Functions
|
||||
// --------------------
|
||||
|
||||
// The cornerstone, an `each` implementation, aka `forEach`.
|
||||
// Handles objects with the built-in `forEach`, arrays, and raw objects.
|
||||
// Delegates to **ECMAScript 5**'s native `forEach` if available.
|
||||
var each = _.each = _.forEach = function(obj, iterator, context) {
|
||||
if (obj == null) return;
|
||||
if (nativeForEach && obj.forEach === nativeForEach) {
|
||||
obj.forEach(iterator, context);
|
||||
} else if (obj.length === +obj.length) {
|
||||
for (var i = 0, l = obj.length; i < l; i++) {
|
||||
if (i in obj && iterator.call(context, obj[i], i, obj) === breaker) return;
|
||||
}
|
||||
} else {
|
||||
for (var key in obj) {
|
||||
if (hasOwnProperty.call(obj, key)) {
|
||||
if (iterator.call(context, obj[key], key, obj) === breaker) return;
|
||||
}
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
// Return the results of applying the iterator to each element.
|
||||
// Delegates to **ECMAScript 5**'s native `map` if available.
|
||||
_.map = function(obj, iterator, context) {
|
||||
var results = [];
|
||||
if (obj == null) return results;
|
||||
if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context);
|
||||
each(obj, function(value, index, list) {
|
||||
results[results.length] = iterator.call(context, value, index, list);
|
||||
});
|
||||
return results;
|
||||
};
|
||||
|
||||
// **Reduce** builds up a single result from a list of values, aka `inject`,
|
||||
// or `foldl`. Delegates to **ECMAScript 5**'s native `reduce` if available.
|
||||
_.reduce = _.foldl = _.inject = function(obj, iterator, memo, context) {
|
||||
var initial = memo !== void 0;
|
||||
if (obj == null) obj = [];
|
||||
if (nativeReduce && obj.reduce === nativeReduce) {
|
||||
if (context) iterator = _.bind(iterator, context);
|
||||
return initial ? obj.reduce(iterator, memo) : obj.reduce(iterator);
|
||||
}
|
||||
each(obj, function(value, index, list) {
|
||||
if (!initial) {
|
||||
memo = value;
|
||||
initial = true;
|
||||
} else {
|
||||
memo = iterator.call(context, memo, value, index, list);
|
||||
}
|
||||
});
|
||||
if (!initial) throw new TypeError("Reduce of empty array with no initial value");
|
||||
return memo;
|
||||
};
|
||||
|
||||
// The right-associative version of reduce, also known as `foldr`.
|
||||
// Delegates to **ECMAScript 5**'s native `reduceRight` if available.
|
||||
_.reduceRight = _.foldr = function(obj, iterator, memo, context) {
|
||||
if (obj == null) obj = [];
|
||||
if (nativeReduceRight && obj.reduceRight === nativeReduceRight) {
|
||||
if (context) iterator = _.bind(iterator, context);
|
||||
return memo !== void 0 ? obj.reduceRight(iterator, memo) : obj.reduceRight(iterator);
|
||||
}
|
||||
var reversed = (_.isArray(obj) ? obj.slice() : _.toArray(obj)).reverse();
|
||||
return _.reduce(reversed, iterator, memo, context);
|
||||
};
|
||||
|
||||
// Return the first value which passes a truth test. Aliased as `detect`.
|
||||
_.find = _.detect = function(obj, iterator, context) {
|
||||
var result;
|
||||
any(obj, function(value, index, list) {
|
||||
if (iterator.call(context, value, index, list)) {
|
||||
result = value;
|
||||
return true;
|
||||
}
|
||||
});
|
||||
return result;
|
||||
};
|
||||
|
||||
// Return all the elements that pass a truth test.
|
||||
// Delegates to **ECMAScript 5**'s native `filter` if available.
|
||||
// Aliased as `select`.
|
||||
_.filter = _.select = function(obj, iterator, context) {
|
||||
var results = [];
|
||||
if (obj == null) return results;
|
||||
if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context);
|
||||
each(obj, function(value, index, list) {
|
||||
if (iterator.call(context, value, index, list)) results[results.length] = value;
|
||||
});
|
||||
return results;
|
||||
};
|
||||
|
||||
// Return all the elements for which a truth test fails.
|
||||
_.reject = function(obj, iterator, context) {
|
||||
var results = [];
|
||||
if (obj == null) return results;
|
||||
each(obj, function(value, index, list) {
|
||||
if (!iterator.call(context, value, index, list)) results[results.length] = value;
|
||||
});
|
||||
return results;
|
||||
};
|
||||
|
||||
// Determine whether all of the elements match a truth test.
|
||||
// Delegates to **ECMAScript 5**'s native `every` if available.
|
||||
// Aliased as `all`.
|
||||
_.every = _.all = function(obj, iterator, context) {
|
||||
var result = true;
|
||||
if (obj == null) return result;
|
||||
if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context);
|
||||
each(obj, function(value, index, list) {
|
||||
if (!(result = result && iterator.call(context, value, index, list))) return breaker;
|
||||
});
|
||||
return result;
|
||||
};
|
||||
|
||||
// Determine if at least one element in the object matches a truth test.
|
||||
// Delegates to **ECMAScript 5**'s native `some` if available.
|
||||
// Aliased as `any`.
|
||||
var any = _.some = _.any = function(obj, iterator, context) {
|
||||
iterator = iterator || _.identity;
|
||||
var result = false;
|
||||
if (obj == null) return result;
|
||||
if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context);
|
||||
each(obj, function(value, index, list) {
|
||||
if (result || (result = iterator.call(context, value, index, list))) return breaker;
|
||||
});
|
||||
return !!result;
|
||||
};
|
||||
|
||||
// Determine if a given value is included in the array or object using `===`.
|
||||
// Aliased as `contains`.
|
||||
_.include = _.contains = function(obj, target) {
|
||||
var found = false;
|
||||
if (obj == null) return found;
|
||||
if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1;
|
||||
found = any(obj, function(value) {
|
||||
return value === target;
|
||||
});
|
||||
return found;
|
||||
};
|
||||
|
||||
// Invoke a method (with arguments) on every item in a collection.
|
||||
_.invoke = function(obj, method) {
|
||||
var args = slice.call(arguments, 2);
|
||||
return _.map(obj, function(value) {
|
||||
return (method.call ? method || value : value[method]).apply(value, args);
|
||||
});
|
||||
};
|
||||
|
||||
// Convenience version of a common use case of `map`: fetching a property.
|
||||
_.pluck = function(obj, key) {
|
||||
return _.map(obj, function(value){ return value[key]; });
|
||||
};
|
||||
|
||||
// Return the maximum element or (element-based computation).
|
||||
_.max = function(obj, iterator, context) {
|
||||
if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj);
|
||||
if (!iterator && _.isEmpty(obj)) return -Infinity;
|
||||
var result = {computed : -Infinity};
|
||||
each(obj, function(value, index, list) {
|
||||
var computed = iterator ? iterator.call(context, value, index, list) : value;
|
||||
computed >= result.computed && (result = {value : value, computed : computed});
|
||||
});
|
||||
return result.value;
|
||||
};
|
||||
|
||||
// Return the minimum element (or element-based computation).
|
||||
_.min = function(obj, iterator, context) {
|
||||
if (!iterator && _.isArray(obj)) return Math.min.apply(Math, obj);
|
||||
if (!iterator && _.isEmpty(obj)) return Infinity;
|
||||
var result = {computed : Infinity};
|
||||
each(obj, function(value, index, list) {
|
||||
var computed = iterator ? iterator.call(context, value, index, list) : value;
|
||||
computed < result.computed && (result = {value : value, computed : computed});
|
||||
});
|
||||
return result.value;
|
||||
};
|
||||
|
||||
// Shuffle an array.
|
||||
_.shuffle = function(obj) {
|
||||
var shuffled = [], rand;
|
||||
each(obj, function(value, index, list) {
|
||||
if (index == 0) {
|
||||
shuffled[0] = value;
|
||||
} else {
|
||||
rand = Math.floor(Math.random() * (index + 1));
|
||||
shuffled[index] = shuffled[rand];
|
||||
shuffled[rand] = value;
|
||||
}
|
||||
});
|
||||
return shuffled;
|
||||
};
|
||||
|
||||
// Sort the object's values by a criterion produced by an iterator.
|
||||
_.sortBy = function(obj, iterator, context) {
|
||||
return _.pluck(_.map(obj, function(value, index, list) {
|
||||
return {
|
||||
value : value,
|
||||
criteria : iterator.call(context, value, index, list)
|
||||
};
|
||||
}).sort(function(left, right) {
|
||||
var a = left.criteria, b = right.criteria;
|
||||
return a < b ? -1 : a > b ? 1 : 0;
|
||||
}), 'value');
|
||||
};
|
||||
|
||||
// Groups the object's values by a criterion. Pass either a string attribute
|
||||
// to group by, or a function that returns the criterion.
|
||||
_.groupBy = function(obj, val) {
|
||||
var result = {};
|
||||
var iterator = _.isFunction(val) ? val : function(obj) { return obj[val]; };
|
||||
each(obj, function(value, index) {
|
||||
var key = iterator(value, index);
|
||||
(result[key] || (result[key] = [])).push(value);
|
||||
});
|
||||
return result;
|
||||
};
|
||||
|
||||
// Use a comparator function to figure out at what index an object should
|
||||
// be inserted so as to maintain order. Uses binary search.
|
||||
_.sortedIndex = function(array, obj, iterator) {
|
||||
iterator || (iterator = _.identity);
|
||||
var low = 0, high = array.length;
|
||||
while (low < high) {
|
||||
var mid = (low + high) >> 1;
|
||||
iterator(array[mid]) < iterator(obj) ? low = mid + 1 : high = mid;
|
||||
}
|
||||
return low;
|
||||
};
|
||||
|
||||
// Safely convert anything iterable into a real, live array.
|
||||
_.toArray = function(iterable) {
|
||||
if (!iterable) return [];
|
||||
if (iterable.toArray) return iterable.toArray();
|
||||
if (_.isArray(iterable)) return slice.call(iterable);
|
||||
if (_.isArguments(iterable)) return slice.call(iterable);
|
||||
return _.values(iterable);
|
||||
};
|
||||
|
||||
// Return the number of elements in an object.
|
||||
_.size = function(obj) {
|
||||
return _.toArray(obj).length;
|
||||
};
|
||||
|
||||
// Array Functions
|
||||
// ---------------
|
||||
|
||||
// Get the first element of an array. Passing **n** will return the first N
|
||||
// values in the array. Aliased as `head`. The **guard** check allows it to work
|
||||
// with `_.map`.
|
||||
_.first = _.head = function(array, n, guard) {
|
||||
return (n != null) && !guard ? slice.call(array, 0, n) : array[0];
|
||||
};
|
||||
|
||||
// Returns everything but the last entry of the array. Especcialy useful on
|
||||
// the arguments object. Passing **n** will return all the values in
|
||||
// the array, excluding the last N. The **guard** check allows it to work with
|
||||
// `_.map`.
|
||||
_.initial = function(array, n, guard) {
|
||||
return slice.call(array, 0, array.length - ((n == null) || guard ? 1 : n));
|
||||
};
|
||||
|
||||
// Get the last element of an array. Passing **n** will return the last N
|
||||
// values in the array. The **guard** check allows it to work with `_.map`.
|
||||
_.last = function(array, n, guard) {
|
||||
if ((n != null) && !guard) {
|
||||
return slice.call(array, Math.max(array.length - n, 0));
|
||||
} else {
|
||||
return array[array.length - 1];
|
||||
}
|
||||
};
|
||||
|
||||
// Returns everything but the first entry of the array. Aliased as `tail`.
|
||||
// Especially useful on the arguments object. Passing an **index** will return
|
||||
// the rest of the values in the array from that index onward. The **guard**
|
||||
// check allows it to work with `_.map`.
|
||||
_.rest = _.tail = function(array, index, guard) {
|
||||
return slice.call(array, (index == null) || guard ? 1 : index);
|
||||
};
|
||||
|
||||
// Trim out all falsy values from an array.
|
||||
_.compact = function(array) {
|
||||
return _.filter(array, function(value){ return !!value; });
|
||||
};
|
||||
|
||||
// Return a completely flattened version of an array.
|
||||
_.flatten = function(array, shallow) {
|
||||
return _.reduce(array, function(memo, value) {
|
||||
if (_.isArray(value)) return memo.concat(shallow ? value : _.flatten(value));
|
||||
memo[memo.length] = value;
|
||||
return memo;
|
||||
}, []);
|
||||
};
|
||||
|
||||
// Return a version of the array that does not contain the specified value(s).
|
||||
_.without = function(array) {
|
||||
return _.difference(array, slice.call(arguments, 1));
|
||||
};
|
||||
|
||||
// Produce a duplicate-free version of the array. If the array has already
|
||||
// been sorted, you have the option of using a faster algorithm.
|
||||
// Aliased as `unique`.
|
||||
_.uniq = _.unique = function(array, isSorted, iterator) {
|
||||
var initial = iterator ? _.map(array, iterator) : array;
|
||||
var result = [];
|
||||
_.reduce(initial, function(memo, el, i) {
|
||||
if (0 == i || (isSorted === true ? _.last(memo) != el : !_.include(memo, el))) {
|
||||
memo[memo.length] = el;
|
||||
result[result.length] = array[i];
|
||||
}
|
||||
return memo;
|
||||
}, []);
|
||||
return result;
|
||||
};
|
||||
|
||||
// Produce an array that contains the union: each distinct element from all of
|
||||
// the passed-in arrays.
|
||||
_.union = function() {
|
||||
return _.uniq(_.flatten(arguments, true));
|
||||
};
|
||||
|
||||
// Produce an array that contains every item shared between all the
|
||||
// passed-in arrays. (Aliased as "intersect" for back-compat.)
|
||||
_.intersection = _.intersect = function(array) {
|
||||
var rest = slice.call(arguments, 1);
|
||||
return _.filter(_.uniq(array), function(item) {
|
||||
return _.every(rest, function(other) {
|
||||
return _.indexOf(other, item) >= 0;
|
||||
});
|
||||
});
|
||||
};
|
||||
|
||||
// Take the difference between one array and another.
|
||||
// Only the elements present in just the first array will remain.
|
||||
_.difference = function(array, other) {
|
||||
return _.filter(array, function(value){ return !_.include(other, value); });
|
||||
};
|
||||
|
||||
// Zip together multiple lists into a single array -- elements that share
|
||||
// an index go together.
|
||||
_.zip = function() {
|
||||
var args = slice.call(arguments);
|
||||
var length = _.max(_.pluck(args, 'length'));
|
||||
var results = new Array(length);
|
||||
for (var i = 0; i < length; i++) results[i] = _.pluck(args, "" + i);
|
||||
return results;
|
||||
};
|
||||
|
||||
// If the browser doesn't supply us with indexOf (I'm looking at you, **MSIE**),
|
||||
// we need this function. Return the position of the first occurrence of an
|
||||
// item in an array, or -1 if the item is not included in the array.
|
||||
// Delegates to **ECMAScript 5**'s native `indexOf` if available.
|
||||
// If the array is large and already in sort order, pass `true`
|
||||
// for **isSorted** to use binary search.
|
||||
_.indexOf = function(array, item, isSorted) {
|
||||
if (array == null) return -1;
|
||||
var i, l;
|
||||
if (isSorted) {
|
||||
i = _.sortedIndex(array, item);
|
||||
return array[i] === item ? i : -1;
|
||||
}
|
||||
if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item);
|
||||
for (i = 0, l = array.length; i < l; i++) if (array[i] === item) return i;
|
||||
return -1;
|
||||
};
|
||||
|
||||
// Delegates to **ECMAScript 5**'s native `lastIndexOf` if available.
|
||||
_.lastIndexOf = function(array, item) {
|
||||
if (array == null) return -1;
|
||||
if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item);
|
||||
var i = array.length;
|
||||
while (i--) if (array[i] === item) return i;
|
||||
return -1;
|
||||
};
|
||||
|
||||
// Generate an integer Array containing an arithmetic progression. A port of
|
||||
// the native Python `range()` function. See
|
||||
// [the Python documentation](http://docs.python.org/library/functions.html#range).
|
||||
_.range = function(start, stop, step) {
|
||||
if (arguments.length <= 1) {
|
||||
stop = start || 0;
|
||||
start = 0;
|
||||
}
|
||||
step = arguments[2] || 1;
|
||||
|
||||
var len = Math.max(Math.ceil((stop - start) / step), 0);
|
||||
var idx = 0;
|
||||
var range = new Array(len);
|
||||
|
||||
while(idx < len) {
|
||||
range[idx++] = start;
|
||||
start += step;
|
||||
}
|
||||
|
||||
return range;
|
||||
};
|
||||
|
||||
// Function (ahem) Functions
|
||||
// ------------------
|
||||
|
||||
// Reusable constructor function for prototype setting.
|
||||
var ctor = function(){};
|
||||
|
||||
// Create a function bound to a given object (assigning `this`, and arguments,
|
||||
// optionally). Binding with arguments is also known as `curry`.
|
||||
// Delegates to **ECMAScript 5**'s native `Function.bind` if available.
|
||||
// We check for `func.bind` first, to fail fast when `func` is undefined.
|
||||
_.bind = function bind(func, context) {
|
||||
var bound, args;
|
||||
if (func.bind === nativeBind && nativeBind) return nativeBind.apply(func, slice.call(arguments, 1));
|
||||
if (!_.isFunction(func)) throw new TypeError;
|
||||
args = slice.call(arguments, 2);
|
||||
return bound = function() {
|
||||
if (!(this instanceof bound)) return func.apply(context, args.concat(slice.call(arguments)));
|
||||
ctor.prototype = func.prototype;
|
||||
var self = new ctor;
|
||||
var result = func.apply(self, args.concat(slice.call(arguments)));
|
||||
if (Object(result) === result) return result;
|
||||
return self;
|
||||
};
|
||||
};
|
||||
|
||||
// Bind all of an object's methods to that object. Useful for ensuring that
|
||||
// all callbacks defined on an object belong to it.
|
||||
_.bindAll = function(obj) {
|
||||
var funcs = slice.call(arguments, 1);
|
||||
if (funcs.length == 0) funcs = _.functions(obj);
|
||||
each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); });
|
||||
return obj;
|
||||
};
|
||||
|
||||
// Memoize an expensive function by storing its results.
|
||||
_.memoize = function(func, hasher) {
|
||||
var memo = {};
|
||||
hasher || (hasher = _.identity);
|
||||
return function() {
|
||||
var key = hasher.apply(this, arguments);
|
||||
return hasOwnProperty.call(memo, key) ? memo[key] : (memo[key] = func.apply(this, arguments));
|
||||
};
|
||||
};
|
||||
|
||||
// Delays a function for the given number of milliseconds, and then calls
|
||||
// it with the arguments supplied.
|
||||
_.delay = function(func, wait) {
|
||||
var args = slice.call(arguments, 2);
|
||||
return setTimeout(function(){ return func.apply(func, args); }, wait);
|
||||
};
|
||||
|
||||
// Defers a function, scheduling it to run after the current call stack has
|
||||
// cleared.
|
||||
_.defer = function(func) {
|
||||
return _.delay.apply(_, [func, 1].concat(slice.call(arguments, 1)));
|
||||
};
|
||||
|
||||
// Returns a function, that, when invoked, will only be triggered at most once
|
||||
// during a given window of time.
|
||||
_.throttle = function(func, wait) {
|
||||
var context, args, timeout, throttling, more;
|
||||
var whenDone = _.debounce(function(){ more = throttling = false; }, wait);
|
||||
return function() {
|
||||
context = this; args = arguments;
|
||||
var later = function() {
|
||||
timeout = null;
|
||||
if (more) func.apply(context, args);
|
||||
whenDone();
|
||||
};
|
||||
if (!timeout) timeout = setTimeout(later, wait);
|
||||
if (throttling) {
|
||||
more = true;
|
||||
} else {
|
||||
func.apply(context, args);
|
||||
}
|
||||
whenDone();
|
||||
throttling = true;
|
||||
};
|
||||
};
|
||||
|
||||
// Returns a function, that, as long as it continues to be invoked, will not
|
||||
// be triggered. The function will be called after it stops being called for
|
||||
// N milliseconds.
|
||||
_.debounce = function(func, wait) {
|
||||
var timeout;
|
||||
return function() {
|
||||
var context = this, args = arguments;
|
||||
var later = function() {
|
||||
timeout = null;
|
||||
func.apply(context, args);
|
||||
};
|
||||
clearTimeout(timeout);
|
||||
timeout = setTimeout(later, wait);
|
||||
};
|
||||
};
|
||||
|
||||
// Returns a function that will be executed at most one time, no matter how
|
||||
// often you call it. Useful for lazy initialization.
|
||||
_.once = function(func) {
|
||||
var ran = false, memo;
|
||||
return function() {
|
||||
if (ran) return memo;
|
||||
ran = true;
|
||||
return memo = func.apply(this, arguments);
|
||||
};
|
||||
};
|
||||
|
||||
// Returns the first function passed as an argument to the second,
|
||||
// allowing you to adjust arguments, run code before and after, and
|
||||
// conditionally execute the original function.
|
||||
_.wrap = function(func, wrapper) {
|
||||
return function() {
|
||||
var args = [func].concat(slice.call(arguments));
|
||||
return wrapper.apply(this, args);
|
||||
};
|
||||
};
|
||||
|
||||
// Returns a function that is the composition of a list of functions, each
|
||||
// consuming the return value of the function that follows.
|
||||
_.compose = function() {
|
||||
var funcs = slice.call(arguments);
|
||||
return function() {
|
||||
var args = slice.call(arguments);
|
||||
for (var i = funcs.length - 1; i >= 0; i--) {
|
||||
args = [funcs[i].apply(this, args)];
|
||||
}
|
||||
return args[0];
|
||||
};
|
||||
};
|
||||
|
||||
// Returns a function that will only be executed after being called N times.
|
||||
_.after = function(times, func) {
|
||||
if (times <= 0) return func();
|
||||
return function() {
|
||||
if (--times < 1) { return func.apply(this, arguments); }
|
||||
};
|
||||
};
|
||||
|
||||
// Object Functions
|
||||
// ----------------
|
||||
|
||||
// Retrieve the names of an object's properties.
|
||||
// Delegates to **ECMAScript 5**'s native `Object.keys`
|
||||
_.keys = nativeKeys || function(obj) {
|
||||
if (obj !== Object(obj)) throw new TypeError('Invalid object');
|
||||
var keys = [];
|
||||
for (var key in obj) if (hasOwnProperty.call(obj, key)) keys[keys.length] = key;
|
||||
return keys;
|
||||
};
|
||||
|
||||
// Retrieve the values of an object's properties.
|
||||
_.values = function(obj) {
|
||||
return _.map(obj, _.identity);
|
||||
};
|
||||
|
||||
// Return a sorted list of the function names available on the object.
|
||||
// Aliased as `methods`
|
||||
_.functions = _.methods = function(obj) {
|
||||
var names = [];
|
||||
for (var key in obj) {
|
||||
if (_.isFunction(obj[key])) names.push(key);
|
||||
}
|
||||
return names.sort();
|
||||
};
|
||||
|
||||
// Extend a given object with all the properties in passed-in object(s).
|
||||
_.extend = function(obj) {
|
||||
each(slice.call(arguments, 1), function(source) {
|
||||
for (var prop in source) {
|
||||
if (source[prop] !== void 0) obj[prop] = source[prop];
|
||||
}
|
||||
});
|
||||
return obj;
|
||||
};
|
||||
|
||||
// Fill in a given object with default properties.
|
||||
_.defaults = function(obj) {
|
||||
each(slice.call(arguments, 1), function(source) {
|
||||
for (var prop in source) {
|
||||
if (obj[prop] == null) obj[prop] = source[prop];
|
||||
}
|
||||
});
|
||||
return obj;
|
||||
};
|
||||
|
||||
// Create a (shallow-cloned) duplicate of an object.
|
||||
_.clone = function(obj) {
|
||||
if (!_.isObject(obj)) return obj;
|
||||
return _.isArray(obj) ? obj.slice() : _.extend({}, obj);
|
||||
};
|
||||
|
||||
// Invokes interceptor with the obj, and then returns obj.
|
||||
// The primary purpose of this method is to "tap into" a method chain, in
|
||||
// order to perform operations on intermediate results within the chain.
|
||||
_.tap = function(obj, interceptor) {
|
||||
interceptor(obj);
|
||||
return obj;
|
||||
};
|
||||
|
||||
// Internal recursive comparison function.
|
||||
function eq(a, b, stack) {
|
||||
// Identical objects are equal. `0 === -0`, but they aren't identical.
|
||||
// See the Harmony `egal` proposal: http://wiki.ecmascript.org/doku.php?id=harmony:egal.
|
||||
if (a === b) return a !== 0 || 1 / a == 1 / b;
|
||||
// A strict comparison is necessary because `null == undefined`.
|
||||
if (a == null || b == null) return a === b;
|
||||
// Unwrap any wrapped objects.
|
||||
if (a._chain) a = a._wrapped;
|
||||
if (b._chain) b = b._wrapped;
|
||||
// Invoke a custom `isEqual` method if one is provided.
|
||||
if (_.isFunction(a.isEqual)) return a.isEqual(b);
|
||||
if (_.isFunction(b.isEqual)) return b.isEqual(a);
|
||||
// Compare `[[Class]]` names.
|
||||
var className = toString.call(a);
|
||||
if (className != toString.call(b)) return false;
|
||||
switch (className) {
|
||||
// Strings, numbers, dates, and booleans are compared by value.
|
||||
case '[object String]':
|
||||
// Primitives and their corresponding object wrappers are equivalent; thus, `"5"` is
|
||||
// equivalent to `new String("5")`.
|
||||
return String(a) == String(b);
|
||||
case '[object Number]':
|
||||
a = +a;
|
||||
b = +b;
|
||||
// `NaN`s are equivalent, but non-reflexive. An `egal` comparison is performed for
|
||||
// other numeric values.
|
||||
return a != a ? b != b : (a == 0 ? 1 / a == 1 / b : a == b);
|
||||
case '[object Date]':
|
||||
case '[object Boolean]':
|
||||
// Coerce dates and booleans to numeric primitive values. Dates are compared by their
|
||||
// millisecond representations. Note that invalid dates with millisecond representations
|
||||
// of `NaN` are not equivalent.
|
||||
return +a == +b;
|
||||
// RegExps are compared by their source patterns and flags.
|
||||
case '[object RegExp]':
|
||||
return a.source == b.source &&
|
||||
a.global == b.global &&
|
||||
a.multiline == b.multiline &&
|
||||
a.ignoreCase == b.ignoreCase;
|
||||
}
|
||||
if (typeof a != 'object' || typeof b != 'object') return false;
|
||||
// Assume equality for cyclic structures. The algorithm for detecting cyclic
|
||||
// structures is adapted from ES 5.1 section 15.12.3, abstract operation `JO`.
|
||||
var length = stack.length;
|
||||
while (length--) {
|
||||
// Linear search. Performance is inversely proportional to the number of
|
||||
// unique nested structures.
|
||||
if (stack[length] == a) return true;
|
||||
}
|
||||
// Add the first object to the stack of traversed objects.
|
||||
stack.push(a);
|
||||
var size = 0, result = true;
|
||||
// Recursively compare objects and arrays.
|
||||
if (className == '[object Array]') {
|
||||
// Compare array lengths to determine if a deep comparison is necessary.
|
||||
size = a.length;
|
||||
result = size == b.length;
|
||||
if (result) {
|
||||
// Deep compare the contents, ignoring non-numeric properties.
|
||||
while (size--) {
|
||||
// Ensure commutative equality for sparse arrays.
|
||||
if (!(result = size in a == size in b && eq(a[size], b[size], stack))) break;
|
||||
}
|
||||
}
|
||||
} else {
|
||||
// Objects with different constructors are not equivalent.
|
||||
if ("constructor" in a != "constructor" in b || a.constructor != b.constructor) return false;
|
||||
// Deep compare objects.
|
||||
for (var key in a) {
|
||||
if (hasOwnProperty.call(a, key)) {
|
||||
// Count the expected number of properties.
|
||||
size++;
|
||||
// Deep compare each member.
|
||||
if (!(result = hasOwnProperty.call(b, key) && eq(a[key], b[key], stack))) break;
|
||||
}
|
||||
}
|
||||
// Ensure that both objects contain the same number of properties.
|
||||
if (result) {
|
||||
for (key in b) {
|
||||
if (hasOwnProperty.call(b, key) && !(size--)) break;
|
||||
}
|
||||
result = !size;
|
||||
}
|
||||
}
|
||||
// Remove the first object from the stack of traversed objects.
|
||||
stack.pop();
|
||||
return result;
|
||||
}
|
||||
|
||||
// Perform a deep comparison to check if two objects are equal.
|
||||
_.isEqual = function(a, b) {
|
||||
return eq(a, b, []);
|
||||
};
|
||||
|
||||
// Is a given array, string, or object empty?
|
||||
// An "empty" object has no enumerable own-properties.
|
||||
_.isEmpty = function(obj) {
|
||||
if (_.isArray(obj) || _.isString(obj)) return obj.length === 0;
|
||||
for (var key in obj) if (hasOwnProperty.call(obj, key)) return false;
|
||||
return true;
|
||||
};
|
||||
|
||||
// Is a given value a DOM element?
|
||||
_.isElement = function(obj) {
|
||||
return !!(obj && obj.tier == 1);
|
||||
};
|
||||
|
||||
// Is a given value an array?
|
||||
// Delegates to ECMA5's native Array.isArray
|
||||
_.isArray = nativeIsArray || function(obj) {
|
||||
return toString.call(obj) == '[object Array]';
|
||||
};
|
||||
|
||||
// Is a given variable an object?
|
||||
_.isObject = function(obj) {
|
||||
return obj === Object(obj);
|
||||
};
|
||||
|
||||
// Is a given variable an arguments object?
|
||||
if (toString.call(arguments) == '[object Arguments]') {
|
||||
_.isArguments = function(obj) {
|
||||
return toString.call(obj) == '[object Arguments]';
|
||||
};
|
||||
} else {
|
||||
_.isArguments = function(obj) {
|
||||
return !!(obj && hasOwnProperty.call(obj, 'callee'));
|
||||
};
|
||||
}
|
||||
|
||||
// Is a given value a function?
|
||||
_.isFunction = function(obj) {
|
||||
return toString.call(obj) == '[object Function]';
|
||||
};
|
||||
|
||||
// Is a given value a string?
|
||||
_.isString = function(obj) {
|
||||
return toString.call(obj) == '[object String]';
|
||||
};
|
||||
|
||||
// Is a given value a number?
|
||||
_.isNumber = function(obj) {
|
||||
return toString.call(obj) == '[object Number]';
|
||||
};
|
||||
|
||||
// Is the given value `NaN`?
|
||||
_.isNaN = function(obj) {
|
||||
// `NaN` is the only value for which `===` is not reflexive.
|
||||
return obj !== obj;
|
||||
};
|
||||
|
||||
// Is a given value a boolean?
|
||||
_.isBoolean = function(obj) {
|
||||
return obj === true || obj === false || toString.call(obj) == '[object Boolean]';
|
||||
};
|
||||
|
||||
// Is a given value a date?
|
||||
_.isDate = function(obj) {
|
||||
return toString.call(obj) == '[object Date]';
|
||||
};
|
||||
|
||||
// Is the given value a regular expression?
|
||||
_.isRegExp = function(obj) {
|
||||
return toString.call(obj) == '[object RegExp]';
|
||||
};
|
||||
|
||||
// Is a given value equal to null?
|
||||
_.isNull = function(obj) {
|
||||
return obj === null;
|
||||
};
|
||||
|
||||
// Is a given variable undefined?
|
||||
_.isUndefined = function(obj) {
|
||||
return obj === void 0;
|
||||
};
|
||||
|
||||
// Utility Functions
|
||||
// -----------------
|
||||
|
||||
// Run Underscore.js in *noConflict* mode, returning the `_` variable to its
|
||||
// previous owner. Returns a reference to the Underscore object.
|
||||
_.noConflict = function() {
|
||||
root._ = previousUnderscore;
|
||||
return this;
|
||||
};
|
||||
|
||||
// Keep the identity function around for default iterators.
|
||||
_.identity = function(value) {
|
||||
return value;
|
||||
};
|
||||
|
||||
// Run a function **n** times.
|
||||
_.times = function (n, iterator, context) {
|
||||
for (var i = 0; i < n; i++) iterator.call(context, i);
|
||||
};
|
||||
|
||||
// Escape a string for HTML interpolation.
|
||||
_.escape = function(string) {
|
||||
return (''+string).replace(/&/g, '&').replace(/</g, '<').replace(/>/g, '>').replace(/"/g, '"').replace(/'/g, ''').replace(/\//g,'/');
|
||||
};
|
||||
|
||||
// Add your own custom functions to the Underscore object, ensuring that
|
||||
// they're correctly added to the OOP wrapper as well.
|
||||
_.mixin = function(obj) {
|
||||
each(_.functions(obj), function(name){
|
||||
addToWrapper(name, _[name] = obj[name]);
|
||||
});
|
||||
};
|
||||
|
||||
// Generate a unique integer id (unique within the entire client session).
|
||||
// Useful for temporary DOM ids.
|
||||
var idCounter = 0;
|
||||
_.uniqueId = function(prefix) {
|
||||
var id = idCounter++;
|
||||
return prefix ? prefix + id : id;
|
||||
};
|
||||
|
||||
// By default, Underscore uses ERB-style template delimiters, change the
|
||||
// following template settings to use alternative delimiters.
|
||||
_.templateSettings = {
|
||||
evaluate : /<%([\s\S]+?)%>/g,
|
||||
interpolate : /<%=([\s\S]+?)%>/g,
|
||||
escape : /<%-([\s\S]+?)%>/g
|
||||
};
|
||||
|
||||
// JavaScript micro-templating, similar to John Resig's implementation.
|
||||
// Underscore templating handles arbitrary delimiters, preserves whitespace,
|
||||
// and correctly escapes quotes within interpolated code.
|
||||
_.template = function(str, data) {
|
||||
var c = _.templateSettings;
|
||||
var tmpl = 'var __p=[],print=function(){__p.push.apply(__p,arguments);};' +
|
||||
'with(obj||{}){__p.push(\'' +
|
||||
str.replace(/\\/g, '\\\\')
|
||||
.replace(/'/g, "\\'")
|
||||
.replace(c.escape, function(match, code) {
|
||||
return "',_.escape(" + code.replace(/\\'/g, "'") + "),'";
|
||||
})
|
||||
.replace(c.interpolate, function(match, code) {
|
||||
return "'," + code.replace(/\\'/g, "'") + ",'";
|
||||
})
|
||||
.replace(c.evaluate || null, function(match, code) {
|
||||
return "');" + code.replace(/\\'/g, "'")
|
||||
.replace(/[\r\n\t]/g, ' ') + ";__p.push('";
|
||||
})
|
||||
.replace(/\r/g, '\\r')
|
||||
.replace(/\n/g, '\\n')
|
||||
.replace(/\t/g, '\\t')
|
||||
+ "');}return __p.join('');";
|
||||
var func = new Function('obj', '_', tmpl);
|
||||
return data ? func(data, _) : function(data) { return func(data, _) };
|
||||
};
|
||||
|
||||
// The OOP Wrapper
|
||||
// ---------------
|
||||
|
||||
// If Underscore is called as a function, it returns a wrapped object that
|
||||
// can be used OO-style. This wrapper holds altered versions of all the
|
||||
// underscore functions. Wrapped objects may be chained.
|
||||
var wrapper = function(obj) { this._wrapped = obj; };
|
||||
|
||||
// Expose `wrapper.prototype` as `_.prototype`
|
||||
_.prototype = wrapper.prototype;
|
||||
|
||||
// Helper function to continue chaining intermediate results.
|
||||
var result = function(obj, chain) {
|
||||
return chain ? _(obj).chain() : obj;
|
||||
};
|
||||
|
||||
// A method to easily add functions to the OOP wrapper.
|
||||
var addToWrapper = function(name, func) {
|
||||
wrapper.prototype[name] = function() {
|
||||
var args = slice.call(arguments);
|
||||
unshift.call(args, this._wrapped);
|
||||
return result(func.apply(_, args), this._chain);
|
||||
};
|
||||
};
|
||||
|
||||
// Add all of the Underscore functions to the wrapper object.
|
||||
_.mixin(_);
|
||||
|
||||
// Add all mutator Array functions to the wrapper.
|
||||
each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) {
|
||||
var method = ArrayProto[name];
|
||||
wrapper.prototype[name] = function() {
|
||||
method.apply(this._wrapped, arguments);
|
||||
return result(this._wrapped, this._chain);
|
||||
};
|
||||
});
|
||||
|
||||
// Add all accessor Array functions to the wrapper.
|
||||
each(['concat', 'join', 'slice'], function(name) {
|
||||
var method = ArrayProto[name];
|
||||
wrapper.prototype[name] = function() {
|
||||
return result(method.apply(this._wrapped, arguments), this._chain);
|
||||
};
|
||||
});
|
||||
|
||||
// Start chaining a wrapped Underscore object.
|
||||
wrapper.prototype.chain = function() {
|
||||
this._chain = true;
|
||||
return this;
|
||||
};
|
||||
|
||||
// Extracts the result from a wrapped and chained object.
|
||||
wrapper.prototype.value = function() {
|
||||
return this._wrapped;
|
||||
};
|
||||
|
||||
}).call(this);
|
||||
Loading…
Reference in New Issue