The question is rather simple, I've written a lexer, using boost::spirit, however I can't seem to find a way, to generate an EOF
token. - So how would one go about doing this?
boost::spirit::lex, how does one generate a end of file token?
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What is an EOF token?
The token iterators Spirit Lex signal 'EOF' by returning the end iterator.
Both the tokenizer API (
lex::tokenize(...)
) as well as Spirit Qi understand this behaviour (by exiting the tokenizing loop (lex) and/or by making theqi::eoi
parser succeed match).E.g. if you need to assert that parsing reached the end of the input, you'd just say
Or if you want to assert the presence of something (say, a closing
;
) unless at end of input:Did I miss something about the question that isn't addressed like this?