update TokenTypes.java to new format of AST print

[romani]

We need to update https://checkstyle.sourceforge.io/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html to reflect the current printed abstract syntax tree representation.

Example of old style (note the + and lack of ->):

 +--LITERAL_NEW (new)
     |
     +--LITERAL_FLOAT (float)
     +--ARRAY_DECLARATOR ([)
     +--ARRAY_INIT ({)
         |
         +--EXPR
             |
             +--NUM_FLOAT (3.0f)
         +--COMMA (,)
         +--EXPR
             |
             +--NUM_FLOAT (4.0f)
         +--RCURLY (})

Example of new style:

 LITERAL_NEW -> new
  |--IDENT -> ArrayList
  |--TYPE_ARGUMENTS -> TYPE_ARGUMENTS
  |   |--GENERIC_START -> <
  |   `--GENERIC_END -> >
  |--LPAREN -> (
  |--ELIST -> ELIST
  |   `--EXPR -> EXPR
  |       `--NUM_INT -> 50
  `--RPAREN -> )

Example of where we need to update: https://checkstyle.sourceforge.io/apidocs/com/puppycrawl/tools/checkstyle/api/TokenTypes.html#PARAMETERS , there might be more, ABSTRACT, STRICTFP, LITERAL_NEW, SINGLE_LINE_COMMENT.

How to generate our AST via command line:

➜  src cat Test.java
public class Test {
    String s = "";
}
➜  src java -jar checkstyle-10.13.0-all.jar -t Test.java | sed 's/->/-\>/g; s/\[[0-9]\+:[0-9]\+\]//g'
COMPILATION_UNIT -> COMPILATION_UNIT 
`--CLASS_DEF -> CLASS_DEF 
    |--MODIFIERS -> MODIFIERS 
    |   `--LITERAL_PUBLIC -> public 
    |--LITERAL_CLASS -> class 
    |--IDENT -> Test 
    `--OBJBLOCK -> OBJBLOCK 
        |--LCURLY -> { 
        |--VARIABLE_DEF -> VARIABLE_DEF 
        |   |--MODIFIERS -> MODIFIERS 
        |   |--TYPE -> TYPE 
        |   |   `--IDENT -> String 
        |   |--IDENT -> s 
        |   |--ASSIGN -> = 
        |   |   `--EXPR -> EXPR 
        |   |       `--STRING_LITERAL -> "" 
        |   `--SEMI -> ; 
        `--RCURLY -> } 

Note that this sed command escapes the > character and removes the line:column numbers for our documentation. Also, please be aware that we may need to update the existing code sample to be a bit more substantial.

For more details about Checkstyle's command line usage, see: https://checkstyle.org/cmdline.html#Command_line_usage

[romani]

@SteLeo1602, please help to resolve this issue.

[Coding-Aliens]

Can I work on it?

[romani]

@Coding-Aliens, you can , but I recommend you to take more complicated issues. Be aware of two PRs already in flight.