# learning-antlr4

**Repository Path**: flwwsg/learning-antlr4

## Basic Information

- **Project Name**: learning-antlr4
- **Description**: antlr4教程代码
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2020-07-28
- **Last Updated**: 2020-12-19

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

### 运行流程
https://github.com/antlr/antlr4/blob/master/doc/getting-started.md
#### 下载 antlr4 完整包
#### 创建快捷方式
add class path
```bash
export CLASSPATH=".:/usr/local/lib/antlr-4.8-complete.jar:$CLASSPATH"
```
antlr4
```cmd
java -classpath path/to/antlr-4.8-complete.jar org.antlr.v4.Tool %*
```
or
```bash
alias antlr4='java -jar /usr/local/lib/antlr-4.8-complete.jar'
```

grun
```cmd
java -classpath path/to/antlr-4.8-complete.jar org.antlr.v4.gui.TestRig %*
```
or
```bash
alias grun="java org.antlr.v4.gui.TestRig $*"
```
#### 生成词法、语法分析器
```bash
antlr4 文件名.g4
```

#### 编译 class 用于下一步的 grun
```bash
javac  文件名*.java
```
#### 运行测试 grun
````bash
grun 文件名 #start_rule -tokens
````
如果存在包名，则需要在包名父目录运行
```bash
grun 包名.文件名 #start_rule -tokens
# or 
grun 包名.文件名 #start_rule -tree #input_file 
# or gui
grun 包名.文件名 #start_rule -tree #input_file -gui
```
输入 token，输入EOF，windows下输入Ctrl+Z，linux下输入Ctrl+D 

### 安装idea antlr4 插件，可以避免手动生成