Hello antlr-interest! So I'm working on my C# pre-processor and I'm trying
to implement the skipping #ifdefed code in the lexer when I ran across this.
I expected
PP_SKIPPED_CHARACTERS
: //{ false }? ( ~(F_NEW_LINE_CHARACTER | '#') F_INPUT_CHARACTER*
F_NEW_LINE )*
;
to be equivalent to
PP_SKIPPED_CHARACTERS
: { false }? ( ~(F_NEW_LINE_CHARACTER | '#') F_INPUT_CHARACTER* F_NEW_LINE
)*
;
but I'm seeing different runtime behavior. So I guess I don't understand
what the { false }? syntax is all about. I know there are probably other
ways to implement the #ifdefed logic but could someone enlighten me as to
why these two bits of code are not equivalent?
Thanks,
Chris
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