# [Google Closure Compiler](https://developers.google.com/closure/compiler/)
[](https://travis-ci.org/google/closure-compiler)
[](https://www.codetriage.com/google/closure-compiler)
The [Closure Compiler](https://developers.google.com/closure/compiler/) is a tool for making JavaScript download and run faster. It is a true compiler for JavaScript. Instead of compiling from a source language to machine code, it compiles from JavaScript to better JavaScript. It parses your JavaScript, analyzes it, removes dead code and rewrites and minimizes what's left. It also checks syntax, variable references, and types, and warns about common JavaScript pitfalls.
## Getting Started
* [Download the latest version](https://dl.google.com/closure-compiler/compiler-latest.zip) ([Release details here](https://github.com/google/closure-compiler/wiki/Releases))
* [Download a specific version](https://github.com/google/closure-compiler/wiki/Binary-Downloads). Also available via:
- [Maven](https://github.com/google/closure-compiler/wiki/Maven)
- [NPM](https://www.npmjs.com/package/google-closure-compiler)
* [Use the JavaScript version](https://github.com/google/closure-compiler-js), with no Java dependency
* See the [Google Developers Site](https://developers.google.com/closure/compiler/docs/gettingstarted_app) for documentation including instructions for running the compiler from the command line.
## Options for Getting Help
1. Post in the [Closure Compiler Discuss Group](https://groups.google.com/forum/#!forum/closure-compiler-discuss).
2. Ask a question on [Stack Overflow](https://stackoverflow.com/questions/tagged/google-closure-compiler).
3. Consult the [FAQ](https://github.com/google/closure-compiler/wiki/FAQ).
## Building it Yourself
Note: The Closure Compiler requires [Java 8 or higher](https://www.java.com/).
### Using [Maven](https://maven.apache.org/)
1. Download [Maven](https://maven.apache.org/download.cgi).
2. Add sonatype snapshots repository to `~/.m2/settings.xml`:
```
<profile>
<id>allow-snapshots</id>
<activation><activeByDefault>true</activeByDefault></activation>
<repositories>
<repository>
<id>snapshots-repo</id>
<url>https://oss.sonatype.org/content/repositories/snapshots</url>
<releases><enabled>false</enabled></releases>
<snapshots><enabled>true</enabled></snapshots>
</repository>
</repositories>
</profile>
```
3. On the command line, at the root of this project, run `mvn -DskipTests` (omit the `-DskipTests` if you want to run all the
unit tests too).
This will produce a jar file called `target/closure-compiler-1.0-SNAPSHOT.jar`. You can run this jar
as per the [Running section](#running) of this Readme. If you want to depend on the compiler via
Maven in another Java project, use the `com.google.javascript/closure-compiler-unshaded` artifact.
Running `mvn -DskipTests -pl externs/pom.xml,pom-main.xml,pom-main-shaded.xml`
will skip building the GWT version of the compiler. This can speed up the build process significantly.
### Using [Eclipse](https://www.eclipse.org/)
1. Download and open [Eclipse IDE](https://www.eclipse.org/). Disable `Project > Build automatically` during this process.
2. On the command line, at the root of this project, run `mvn eclipse:eclipse -DdownloadSources=true` to download JARs and build Eclipse project configuration.
3. Run `mvn clean` and `mvn -DskipTests` to ensure AutoValues are generated and updated.
4. In Eclipse, navigate to `File > Import > Maven > Existing Maven Projects` and browse to closure-compiler.
5. Import both closure-compiler and the nested externs project.
6. Disregard the warnings about maven-antrun-plugin and build errors.
7. Configure the project to use the [Google Eclipse style guide](https://github.com/google/styleguide/blob/gh-pages/eclipse-java-google-style.xml)
8. Edit `.classpath` in closure-compiler-parent. Delete the `<classpathentry ... kind="src" path="src" ... />` line, then add:
```
<classpathentry excluding="com/google/debugging/sourcemap/super/**|com/google/javascript/jscomp/debugger/gwt/DebuggerGwtMain.java|com/google/javascript/jscomp/gwt/|com/google/javascript/jscomp/resources/super-gwt/**" kind="src" path="src"/>
<classpathentry kind="src" path="target/generated-sources/annotations"/>
```
9. Ensure the Eclipse project settings specify 1.8 compliance level in "Java Compiler".
10. Build project in Eclipse (right click on the project `closure-compiler-parent` and select `Build Project`).
11. See *Using Maven* above to build the JAR.
## Running
On the command line, at the root of this project, type
```
java -jar target/closure-compiler-1.0-SNAPSHOT.jar
```
This starts the compiler in interactive mode. Type
```javascript
var x = 17 + 25;
```
then hit "Enter", then hit "Ctrl-Z" (on Windows) or "Ctrl-D" (on Mac or Linux)
and "Enter" again. The Compiler will respond:
```javascript
var x=42;
```
The Closure Compiler has many options for reading input from a file, writing
output to a file, checking your code, and running optimizations. To learn more,
type
```
java -jar compiler.jar --help
```
More detailed information about running the Closure Compiler is available in the
[documentation](https://developers.google.com/closure/compiler/docs/gettingstarted_app).
### Run using Eclipse
1. Open the class `src/com/google/javascript/jscomp/CommandLineRunner.java` or create your own extended version of the class.
2. Run the class in Eclipse.
3. See the instructions above on how to use the interactive mode - but beware of the [bug](https://stackoverflow.com/questions/4711098/passing-end-of-transmission-ctrl-d-character-in-eclipse-cdt-console) regarding passing "End of Transmission" in the Eclipse console.
## Compiling Multiple Scripts
If you have multiple scripts, you should compile them all together with one
compile command.
```bash
java -jar compiler.jar --js_output_file=out.js in1.js in2.js in3.js ...
```
You can also use minimatch-style globs.
```bash
# Recursively include all js files in subdirs
java -jar compiler.jar --js_output_file=out.js 'src/**.js'
# Recursively include all js files in subdirs, excluding test files.
# Use single-quotes, so that bash doesn't try to expand the '!'
java -jar compiler.jar --js_output_file=out.js 'src/**.js' '!**_test.js'
```
The Closure Compiler will concatenate the files in the order they're passed at
the command line.
If you're using globs or many files, you may start to run into
problems with managing dependencies between scripts. In this case, you should
use the [Closure Library](https://developers.google.com/closure/library/). It
contains functions for enforcing dependencies between scripts, and Closure Compiler
will re-order the inputs automatically.
## How to Contribute
### Reporting a bug
1. First make sure that it is really a bug and not simply the way that Closure Compiler works (especially true for ADVANCED_OPTIMIZATIONS).
* Check the [official documentation](https://developers.google.com/closure/compiler/)
* Consult the [FAQ](https://github.com/google/closure-compiler/wiki/FAQ)
* Search on [Stack Overflow](https://stackoverflow.com/questions/tagged/google-closure-compiler) and in the [Closure Compiler Discuss Group](https://groups.google.com/forum/#!forum/closure-compiler-discuss)
2. If you still think you have found a bug, make sure someone hasn't already reported it. See the list of [known issues](https://github.com/google/closure-compiler/issues).
3. If it hasn't been reported yet, post a new issue. Make sure to add enough detail so that the bug can be recreated. The smaller the reproduction code, the better.
### Suggesting a Feature
1. Consult the [FAQ](https://github.com/google/closure-compiler/wiki/FAQ) to make sur
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selenium-selenium-4.5.0.zip源码 （2000个子文件） 
civetweb.c 527KB x_ignore_nofocus.c 21KB jsoncpp.cpp 156KB IECommandExecutor.cpp 71KB Element.cpp 71KB BrowserFactory.cpp 61KB InputManager.cpp 53KB NewSessionCommandHandler.cpp 49KB SendKeysCommandHandler.cpp 44KB Browser.cpp 32KB Script.cpp 31KB CookieManager.cpp 30KB interactions.cpp 26KB Alert.cpp 23KB ProxyManager.cpp 23KB VariantUtilities.cpp 22KB DocumentHost.cpp 20KB interactions_linux.cpp 20KB AsyncScriptExecutor.cpp 20KB CivetServer.cpp 17KB HookProcessor.cpp 16KB SendMessageActionSimulator.cpp 15KB IEDriverServer.cpp 14KB ElementFinder.cpp 14KB interactions_linux_mouse.cpp 13KB ClickElementCommandHandler.cpp 13KB CommandHandlerRepository.cpp 13KB StringUtilities.cpp 11KB IESession.cpp 11KB ScreenshotCommandHandler.cpp 10KB HtmlDialog.cpp 9KB SendInputActionSimulator.cpp 9KB ibushandler.cpp 7KB JavaScriptActionSimulator.cpp 7KB RegistryUtilities.cpp 7KB SetWindowRectCommandHandler.cpp 7KB ExecuteAsyncScriptCommandHandler.cpp 6KB event_firing_thread.cpp 6KB ElementRepository.cpp 5KB FindChildElementsCommandHandler.cpp 5KB FindChildElementCommandHandler.cpp 5KB GetElementRectCommandHandler.cpp 5KB ClearElementCommandHandler.cpp 5KB WindowUtilities.cpp 5KB GetElementValueOfCssPropertyCommandHandler.cpp 5KB AddCookieCommandHandler.cpp 4KB FindElementsCommandHandler.cpp 4KB GoToUrlCommandHandler.cpp 4KB interactions_linux_common.cpp 4KB FindElementCommandHandler.cpp 4KB GetElementTextCommandHandler.cpp 4KB translate_keycode_linux.cpp 4KB PersistentEventSimulator.cpp 4KB ScreenshotElementCommandHandler.cpp 4KB BrowserCookie.cpp 4KB GetElementAttributeCommandHandler.cpp 3KB GetSessionCapabilitiesCommandHandler.cpp 3KB SwitchToFrameCommandHandler.cpp 3KB IEServer.cpp 3KB GetElementPropertyCommandHandler.cpp 3KB SwitchToWindowCommandHandler.cpp 3KB IECommandHandler.cpp 3KB GetActiveElementCommandHandler.cpp 3KB ExecuteScriptCommandHandler.cpp 3KB ElementEqualsCommandHandler.cpp 3KB SetAlertCredentialsCommandHandler.cpp 3KB CommandLineArguments.cpp 3KB CreateNewWindowCommandHandler.cpp 3KB SendKeysToAlertCommandHandler.cpp 3KB GetNamedCookieCommandHandler.cpp 3KB SetTimeoutsCommandHandler.cpp 3KB FileUtilities.cpp 3KB ActionSimulator.cpp 3KB IsElementDisplayedCommandHandler.cpp 3KB ActionsCommandHandler.cpp 3KB GetCurrentUrlCommandHandler.cpp 2KB GetElementTagNameCommandHandler.cpp 2KB IsElementSelectedCommandHandler.cpp 2KB GetAllCookiesCommandHandler.cpp 2KB IsElementEnabledCommandHandler.cpp 2KB WebDriver.cpp 2KB FullScreenWindowCommandHandler.cpp 2KB CloseWindowCommandHandler.cpp 2KB DismissAlertCommandHandler.cpp 2KB DeleteCookieCommandHandler.cpp 2KB AcceptAlertCommandHandler.cpp 2KB GetWindowRectCommandHandler.cpp 2KB DeleteAllCookiesCommandHandler.cpp 2KB MinimizeWindowCommandHandler.cpp 2KB MaximizeWindowCommandHandler.cpp 2KB QuitCommandHandler.cpp 2KB ScriptException.cpp 2KB GetAlertTextCommandHandler.cpp 2KB interactions_common.cpp 2KB GetTimeoutsCommandHandler.cpp 2KB GetCurrentWindowHandleCommandHandler.cpp 2KB ReleaseActionsCommandHandler.cpp 2KB RefreshCommandHandler.cpp 2KB SwitchToParentFrameCommandHandler.cpp 2KB GetPageSourceCommandHandler.cpp 2KB共 2000 条
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