ANTLR

您可以在Wikipedia上了解到此条目的英文信息 ANTLR Thanks, Wikipedia.

ANTLR, ANother Tool for Language Recognition, is a language tool that provides a framework for constructing recognizers, interpreters, compilers, and translators from grammatical descriptions containing actions in a variety of target languages. ANTLR provides excellent support for tree construction, tree walking, translation, error recovery, and error reporting.

指南

mac OS

$ cd /usr/local/lib
$ sudo curl -O https://www.antlr.org/download/antlr-4.7.1-complete.jar
$ export CLASSPATH=".:/usr/local/lib/antlr-4.7.1-complete.jar:$CLASSPATH"
$ alias antlr4='java -jar /usr/local/lib/antlr-4.7.1-complete.jar'
$ alias grun='java org.antlr.v4.gui.TestRig'

touch Expr.g4

grammar Expr;		
prog:	(expr NEWLINE)* ;
expr:	expr ('*'|'/') expr
    |	expr ('+'|'-') expr
    |	INT
    |	'(' expr ')'
    ;
NEWLINE : [\r\n]+ ;
INT     : [0-9]+ ;

运行

$ antlr4 Expr.g4
$ javac Expr*.java
$ grun Expr prog -gui
100+2*34
^D

图集

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链接

• ANTLR主页
• ANTLR文档
• ANTLR下载