mac antrl4环境安装&第一个程序

$ cd /usr/local/lib
$ sudo curl -O https://www.antlr.org/download/antlr-4.7.2-complete.jar
  
// 设置环境变量
$ vim .bash_profile  
$ export CLASSPATH=".:/usr/local/lib/antlr-4.7.2-complete.jar:$CLASSPATH"
$ alias antlr4='java -jar /usr/local/lib/antlr-4.7.2-complete.jar'
$ alias grun='java org.antlr.v4.gui.TestRig'
$ wq!  // 保存
$ source .bash_profile  
  
// 测试,以下则成功：
$ antlr4
ANTLR Parser Generator  Version 4.7.2
 -o ___              specify output directory where all output is generated
 -lib ___            specify location of grammars, tokens files
 -atn                generate rule augmented transition network diagrams
 -encoding ___       specify grammar file encoding; e.g., euc-jp
 -message-format ___ specify output style for messages in antlr, gnu, vs2005
 -long-messages      show exception details when available for errors and warnings
 -listener           generate parse tree listener (default)
 -no-listener        don't generate parse tree listener
 -visitor            generate parse tree visitor
 -no-visitor         don't generate parse tree visitor (default)
 -package ___        specify a package/namespace for the generated code
 -depend             generate file dependencies
 -D<option>=value    set/override a grammar-level option
 -Werror             treat warnings as errors
 -XdbgST             launch StringTemplate visualizer on generated code
 -XdbgSTWait         wait for STViz to close before continuing
 -Xforce-atn         use the ATN simulator for all predictions
 -Xlog               dump lots of logging info to antlr-timestamp.log
 -Xexact-output-dir  all output goes into -o dir regardless of paths/package

　　第一个测试程序：

$ mkdir test
$ cd test/
$ vim Hello.g4
  
输入：
// Define a grammar called Hello
grammar Hello;
r  : 'hello' ID ;         // match keyword hello followed by an identifier
ID : [a-z]+ ;             // match lower-case identifiers
WS : [ \t\r\n]+ -> skip ; // skip spaces, tabs, newlines
  
$ wq! // 保存
$ antlr4 Hello.g4
$ ls
Hello.g4        HelloBaseListener.java  HelloLexer.tokens
Hello.interp        HelloLexer.interp   HelloListener.java
Hello.tokens        HelloLexer.java     HelloParser.java
  
$ javac Hello*.java
$ ls
Hello.g4            HelloLexer.java
Hello.interp            HelloLexer.tokens
Hello.tokens            HelloListener.class
HelloBaseListener.class     HelloListener.java
HelloBaseListener.java      HelloParser$RContext.class
HelloLexer.class        HelloParser.class
HelloLexer.interp       HelloParser.java
  
$ grun Hello r -gui  // 按回车
hello test  // 输入这个，再按回车
^D // 按ctrl+D 就出现gui图形界面了