86 lines
2.3 KiB
Plaintext
86 lines
2.3 KiB
Plaintext
[#repeated_reject_incomplete1]
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[section repeated_reject_incomplete1]
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[h1 Synopsis]
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template <class P>
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struct repeated_reject_incomplete1;
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This is a [link parser_combinator parser combinator].
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[table Arguments
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[[Name] [Type]]
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[[`P`] [[link parser parser]]]
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]
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[h1 Description]
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The same as [link repeated1 `repeated1`], but once `P` rejects the input,
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`repeated_reject_incomplete1` checks if `P` consumes any characters before
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rejecting the input. If so, `repeated_reject_incomplete1` rejects the input with
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the same error message this last application of `P` returned. Otherwise
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_reject_incomplete`repeated1` accepts the input and gives the same result as
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[link repeated1 `repeated1`].
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[h1 Header]
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#include <boost/metaparse/repeated_reject_incomplete1.hpp>
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[h1 Expression semantics]
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For any `p` parser, `s` compile-time string and `pos` source position
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repeated_reject_incomplete1<p>::apply<s, pos>
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is equivalent to
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first_of<repeated1<p>, fail_at_first_char_expected<p> >::apply<s, pos>
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[h1 Example]
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#include <boost/metaparse/repeated_reject_incomplete1.hpp>
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#include <boost/metaparse/lit_c.hpp>
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#include <boost/metaparse/last_of.hpp>
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#include <boost/metaparse/token.hpp>
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#include <boost/metaparse/int_.hpp>
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#include <boost/metaparse/string.hpp>
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#include <boost/metaparse/start.hpp>
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#include <boost/metaparse/get_result.hpp>
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#include <boost/metaparse/is_error.hpp>
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#include <boost/mpl/equal.hpp>
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#include <boost/mpl/vector_c.hpp>
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using namespace boost::metaparse;
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using int_token = token<int_>;
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using plus_token = token<lit_c<'+'>>;
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using plus_int = last_of<plus_token, int_token>;
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using ints = repeated_reject_incomplete1<plus_int>;
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static_assert(
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boost::mpl::equal<
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boost::mpl::vector_c<int, 13, 3, 21>,
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get_result<
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ints::apply<BOOST_METAPARSE_STRING("+ 13 + 3 + 21"), start>
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>::type
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>::type::value,
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"ints should parse the numbers"
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);
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static_assert(
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is_error<
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ints::apply<BOOST_METAPARSE_STRING("+ 13 + 3 +"), start>
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>::type::value,
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"when the last number is missing, it should be an error"
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);
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static_assert(
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is_error<ints::apply<BOOST_METAPARSE_STRING(""), start>>::type::value,
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"when no numbers are provided, it should be an error"
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);
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[endsect]
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