antlr4例子步骤

antlr4 getting-started

1. 下载jar

#基于java8
wget  https://www.antlr.org/download/antlr-4.5-complete.jar
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2. 下载词法定义、语法定义

git clone https://github.com/antlr/grammars-v4.git
#grammars-v4/java/java8/Java8Parser.g4  
#grammars-v4/java/java8/Java8Lexer.g4  

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3. 生成解析器

java -cp antlr-4.5-complete.jar org.antlr.v4.Tool Java8Parser.g4
java -cp antlr-4.5-complete.jar org.antlr.v4.Tool Java8Lexer.g4
#生成了: Java8Lexer.java Java8Lexer.tokens Java8Parser.java Java8Parser.tokens  Java8ParserListener.java Java8ParserBaseListener.java

#或者
alias antlr4='java -Xmx500M -cp "./antlr-4.10.1-complete.jar:$CLASSPATH" org.antlr.v4.Tool'
alias grun='java -Xmx500M -cp "./antlr-4.10.1-complete.jar:$CLASSPATH" org.antlr.v4.gui.TestRig'

antlr4  Java8Parser.g4
antlr4 Java8Lexer.g4
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4. demo中使用解析器