trdeltree

trdeltree

Summary

Delete an entire subtree of a parse tree

Description

Reads a parse tree from stdin, and given an XPath expression for the nodes in the parse tree, delete the nodes and all children recursively. Writes the modified tree to stdout. The input and output are Parse Tree Data.

Usage

trdeltree 

Example

Before:

grammar Expression;
e : e ('*' | '/') e
  | e ('+' | '-') e
  | '(' e ')'
  | ('-' | '+')* a
  ;
a : INT ;
INT : ('0' .. '9')+ ;
MUL : '*' ;
DIV : '/' ;
ADD : '+' ;
SUB : '-' ;
LP : '(' ;
RP : ')' ;
WS : [ \r\n\t] + -> skip ;

Command:

trparse Expression.g4 | trdelete "//parserRuleSpec[RULE_REF/text() = 'a']" | trprint

After:

grammar Expression;
e : e ('*' | '/') e
  | e ('+' | '-') e
  | '(' e ')'
  | ('-' | '+')* a
  ;
a : INT ;
INT : ('0' .. '9')+ ;
MUL : '*' ;
DIV : '/' ;
ADD : '+' ;
SUB : '-' ;
LP : '(' ;
RP : ')' ;
WS : [ \r\n\t] + -> skip ;

Notes

If you are running MSYS2 on Windows, you may notice that XPaths are not being processed by this command correctly. To avoid the Bash shell from altering XPaths, type export MSYS2_ARG_CONV_EXCL="*", then execute your command.

Current version

0.22.0 Add trdot. Update to Antlr 4.13.1 and Dotnet 8.0.

License

The MIT License

Copyright (c) 2024 Ken Domino

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

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