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Boost.Phoenix makes it easier to attach semantic actions. You just inline your lambda expressions:
l[phoenix-lambda-expression]
Spirit.Lex provides some Boost.Phoenix
placeholders to access important information from the Context
that are otherwise difficult to extract.
Spirit.Lex specific Phoenix placeholders
_start,
_end
Iterators pointing to the begin and the end of the matched input sequence.
_pass
Assign lex::pass_flags::pass_fail
to _pass
to force the current match to fail.
_tokenid
The token id of the matched token.
_val
The token value of the matched token.
_state
The lexer state the token has been matched in.
_eoi
Iterator referring to the current end of the input sequence.
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Tip |
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All of the placeholders in the list above (except |
For more information see Lexer Semantic Actions.