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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

0.23.11 Fix trgen for st*.g4 grammars. Add template processing for target-specific files in a grammmar.

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.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.