搭建antlr4.2.2开发环境

1：kepler版本的eclipse安装maven：http://download.eclipse.org/technology/m2e/releases/1.0/1.0.0.20110607-2117

2：编辑pom.xml，加入如下依赖： 

  <dependencies>

  <dependency>

  <groupId>org.antlr</groupId>

  <artifactId>antlr4-runtime</artifactId>

  <version>4.2.2</version>

  </dependency>

  <dependency>

  <groupId>org.antlr</groupId>

  <artifactId>antlr4</artifactId>

  <version>4.2.2</version>

</dependency>

  </dependencies>

3：安装antlr4.2.2的eclipse插件（参考：https://github.com/jknack/antlr4ide）

1，插件安装环境：

• Eclipse 4.3 (Kepler)
• XText 2.5.x/2.6

 2，安装：

ANTLR 4 IDE isn't available in the Eclipse Market Place yet, so you MUST installed in the old way. Please follow these instructions:

• Open Eclipse Kepler (4.3)
• Go to: Help > Install New Software...
• You need to Install XText 2.5.x/2.6
• Copy and paste this url: http://download.eclipse.org/modeling/tmf/xtext/updates/composite/releases/ in theWork with text field
• Hit Enter
• Choose XText 2.5.4. NOTE: DON'T confuse with Xtend, you must choose Xtext
• Now, copy and paste this url: http://dl.bintray.com/jknack/antlr4ide in the Work with text field
• Choose: ANTLR 4 SDK IDE. NOTE: If you don't see it, please unmark the Group items by category option
• Click: Next and follow the normal Eclipse installation procedure

3，使用：

The new IDE is very simple to use all the files with a *.g4 extension will be opened by the ANTLR 4 Editor. So, just open a *.g4 file and play with it

4，产生代码：

Code is automatically generated on save if the grammar is valid. You can turn off this feature by going to: Window > Preferences > ANTLR 4 > Tool and uncheck the "Tool is activated" option. From there you can configure a couple more of options.

You can find the generated code in the target/generated-sources/antlr4 (same directory as antlr4-maven-plugin)

5，手动产生代码：

You can fire a code generation action by selecting a *.g4 file from the Package Explorer, right click: Run As > ANTLR 4.

A default ANTLR 4 launch configuration will be created. You can modify the generated launch configuration by going to: Run > External Tools > External Tools Configurations... from there you will see the launch configuration and how to set or override code generation options

4：插件的使用：

1，可以自动生成语法树：

 

2，可以根据.g文件自动生成图形化的文法结构：