Hi,
I am converting from one language to another using tree re-write rules.
I am getting an error when both languages define the same token. For
example:
>From A.g:
grammar A;
options { output = AST; }
tokens { PROGRAM; A; }
accept : program EOF -> ^(PROGRAM program);
program : ',' 'a' -> ^(A ',' 'a');
WHITE_SPACE : (' '|'\t'|'\r'|'\n')+ {
$channel = HIDDEN; };
>From B.g:
grammar B;
options { output = AST; }
tokens { BPROGRAM; B; }
accept : program EOF -> ^(BPROGRAM program);
program : 'b' ',' -> ^(B 'b' ',');
WHITE_SPACE : (' '|'\t'|'\r'|'\n')+ {
$channel = HIDDEN; };
>From AtoB.g:
tree grammar AtoB;
options { tokenVocab=A; tokenVocab=B; ASTLabelType=CommonTree; output=AST; }
accept : ^(PROGRAM program) -> ^(PROGRAM program);
program : ^(A ',' 'a') -> ^(B 'b' ',');
The error seems to occur because both A.g and B.g use a ',' literal, assigned
different values in their respective .tokens files. When I reference
the ',' literal
in AtoB.g, I'm guessing that there is no way to tell if it is A's token or B's.
Is there either a way to scope tokens (A::';') or is there way to
define a common
set of tokens that are shared by both grammars, and then import them?
thank you,
Robert
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