trfoldlit 0.23.0

trfoldlit

Summary

Perform fold transform on grammar with literals

Description

Reads a parse tree from stdin, replaces a string literals on the RHS of a rule with the lexer rule LHS symbol, and writes the modified parsing result set to stdout. The input and output are Parse Tree Data.

Usage

trfoldlit

Examples

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 | trfoldlit | trsponge -c

After:

grammar Expression;
e : e (MUL | DIV) e
  | e (ADD | SUB) e
  | LP e RP
  | (SUB | ADD)* 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

0.23.0 Major changes to trgen, trparse, trfoldlit, trquery. Removal of trinsert, trdelete, trmove, trdelabel, trstrip.

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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