antlr4 / java：漂亮的打印解析树到标准输出 [英] antlr4/java: pretty print parse tree to stdout

问题描述

初学者提问：如何将可读版本的解析树打印到stdout？

  CharStream input = CharStreams.fromFileName （ TESTDATA / test.txt的）; 
 MyLexer lexer = new MyLexer（输入）; 
 CommonTokenStream tokens = new CommonTokenStream（lexer）; 
 MyParser解析器= new MyParser（令牌）; 
 parser.setBuildParseTree（true）; 
 RuleContext tree = parser.record（）; 
 System.out.println（tree.toStringTree（parser））; 
  

这会将整个树打印在由括号'（）'分隔的一行上。

 （记录（丈夫< 4601>（姓名KOHAI Nikolaus）\ n（出生* um.1872（地点Ploschitz） ）（妻子（婚姻oo）\ n（姓名SCHLOTTHAUER Maria）\ n（出生* um.1877 
 ... 
  

我想要这样的东西

 记录
丈夫
< id> 
名称
< name> 
 ... 
妻子
  

解决方案

除了图形解析树

Beginners question: how do I print a readable version of the parse tree to stdout?

CharStream input = CharStreams.fromFileName("testdata/test.txt");
MyLexer lexer = new MyLexer(input);
CommonTokenStream tokens = new CommonTokenStream(lexer);
MyParser parser = new MyParser(tokens);     
parser.setBuildParseTree(true);
RuleContext tree = parser.record();
System.out.println(tree.toStringTree(parser));

this prints the whole tree on a single line delimited by brackets '()'.

(record (husband <4601>   (name KOHAI   Nikolaus) \n (birth *   um.1872   (place Ploschitz)) \n\n) (wife      (marriage oo) \n      (name SCHLOTTHAUER   Maria) \n      (birth *   um.1877  
...

I would like to have something like this

record 
  husband
    <id>
    name
       <name>
...
  wife

解决方案

Besides a graphical parse tree my ANTLR4 extension for Visual Studio Code also produces a formatted text parse tree:

这篇关于antlr4 / java：漂亮的打印解析树到标准输出的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！