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

0.21.6 Fix trquery.