trfoldlit

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

0.21.16 Add trglob for platform-independent "find" for testing. Add Antlr4ng target, a new Antlr4 tool and TypeScript runtime. Update templates.