trconvert 0.22.0

trconvert

Summary

Convert a grammar from one for to another

Description

Reads a grammar from stdin and converts the grammar to/from Antlr version 4 syntax. The original grammar must be for a supported type (Antlr2, Antlr3, Bison, W3C EBNF, Lark). The input and output are Parse Tree Data.

Usage

trconvert [-t <type>]

Details

This command converts a grammar from one type to another. Most conversions will handle only simple syntax differences. More complicated scenarios are supported depending on the source and target grammar types. For example, Bison is converted to Antlr4, but the reverse is not implemented yet.

trconvert takes an option target type. If it is not used, the default is to convert the input of whatever type to Antlr4 syntax. The output of trconvert is a parse tree containing the converted grammar.

Examples

Conversion of Antlr4 Abnf to Lark Abnf

grammar Abnf;

rulelist : rule_* EOF ;
rule_ : ID '=' '/'? elements ;
elements : alternation ;
alternation : concatenation ( '/' concatenation )* ;
concatenation : repetition + ;
repetition : repeat_? element ;
repeat_ : INT | ( INT? '*' INT? ) ;
element : ID | group | option | STRING | NumberValue | ProseValue ;
group : '(' alternation ')' ;
option : '[' alternation ']' ;
NumberValue : '%' ( BinaryValue | DecimalValue | HexValue ) ;
fragment BinaryValue : 'b' BIT+ ( ( '.' BIT+ )+ | ( '-' BIT+ ) )? ;
fragment DecimalValue : 'd' DIGIT+ ( ( '.' DIGIT+ )+ | ( '-' DIGIT+ ) )? ;
fragment HexValue : 'x' HEX_DIGIT+ ( ( '.' HEX_DIGIT+ )+ | ( '-' HEX_DIGIT+ ) )? ;
ProseValue : '<' ( ~ '>' )* '>' ;
ID : LETTER ( LETTER | DIGIT | '-' )* ;
INT : '0' .. '9'+ ;
COMMENT : ';' ~ ( '\n' | '\r' )* '\r'? '\n' -> channel ( HIDDEN ) ;
WS : ( ' ' | '\t' | '\r' | '\n' ) -> channel ( HIDDEN ) ;
STRING : ( '%s' | '%i' )? '"' ( ~ '"' )* '"' ;
fragment LETTER : 'a' .. 'z' | 'A' .. 'Z' ;
fragment BIT : '0' .. '1' ;
fragment DIGIT : '0' .. '9' ;
fragment HEX_DIGIT : ( '0' .. '9' | 'a' .. 'f' | 'A' .. 'F' ) ;

Command

trparse Abnf.g4 | trconvert -t lark | trprint > Abnf.lark

Output

rulelist :  rule_ * EOF 
rule_ :  ID "=" "/" ? elements 
elements :  alternation 
alternation :  concatenation ( "/" concatenation ) * 
concatenation :  repetition + 
repetition :  repeat_ ? element 
repeat_ :  INT | ( INT ? "*" INT ? ) 
element :  ID | group | option | STRING | NUMBERVALUE | PROSEVALUE 
group :  "(" alternation ")" 
option :  "[" alternation "]" 
NUMBERVALUE :  "%" ( BINARYVALUE | DECIMALVALUE | HEXVALUE ) 
BINARYVALUE :  "b" BIT + ( ( "." BIT + ) + | ( "-" BIT + ) ) ? 
DECIMALVALUE :  "d" DIGIT + ( ( "." DIGIT + ) + | ( "-" DIGIT + ) ) ? 
HEXVALUE :  "x" HEX_DIGIT + ( ( "." HEX_DIGIT + ) + | ( "-" HEX_DIGIT + ) ) ? 
PROSEVALUE :  "<" ( /(?!>)/ ) * ">" 
ID :  LETTER ( LETTER | DIGIT | "-" ) * 
INT :  "0" .. "9" + 
COMMENT :  ";" /(?!\n|\r)/ * "\r" ? "\n" 
WS :  ( " " | "\t" | "\r" | "\n" ) 
STRING :  ( "%s" | "%i" ) ? "\"" ( /(?!")/ ) * "\"" 
LETTER :  "a" .. "z" | "A" .. "Z" 
BIT :  "0" .. "1" 
DIGIT :  "0" .. "9" 
HEX_DIGIT :  ( "0" .. "9" | "a" .. "f" | "A" .. "F" ) 

%ignore COMMENT
%ignore WS

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

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