You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
476 lines
18 KiB
476 lines
18 KiB
3 years ago
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// detail/dynamic/parser_traits.hpp
|
||
|
|
//
|
||
|
|
// Copyright 2008 Eric Niebler. Distributed under the Boost
|
||
|
|
// Software License, Version 1.0. (See accompanying file
|
||
|
|
// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
|
||
|
|
|
||
|
|
#ifndef BOOST_XPRESSIVE_DETAIL_DYNAMIC_PARSER_TRAITS_HPP_EAN_10_04_2005
|
||
|
|
#define BOOST_XPRESSIVE_DETAIL_DYNAMIC_PARSER_TRAITS_HPP_EAN_10_04_2005
|
||
|
|
|
||
|
|
// MS compatible compilers support #pragma once
|
||
|
|
#if defined(_MSC_VER)
|
||
|
|
# pragma once
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include <string>
|
||
|
|
#include <climits>
|
||
|
|
#include <boost/config.hpp>
|
||
|
|
#include <boost/assert.hpp>
|
||
|
|
#include <boost/throw_exception.hpp>
|
||
|
|
#include <boost/xpressive/regex_error.hpp>
|
||
|
|
#include <boost/xpressive/regex_traits.hpp>
|
||
|
|
#include <boost/xpressive/detail/detail_fwd.hpp>
|
||
|
|
#include <boost/xpressive/detail/dynamic/matchable.hpp>
|
||
|
|
#include <boost/xpressive/detail/dynamic/parser_enum.hpp>
|
||
|
|
#include <boost/xpressive/detail/utility/literals.hpp>
|
||
|
|
#include <boost/xpressive/detail/utility/algorithm.hpp>
|
||
|
|
|
||
|
|
namespace boost { namespace xpressive
|
||
|
|
{
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// compiler_traits
|
||
|
|
// this works for char and wchar_t. it must be specialized for anything else.
|
||
|
|
//
|
||
|
|
template<typename RegexTraits>
|
||
|
|
struct compiler_traits
|
||
|
|
{
|
||
|
|
typedef RegexTraits regex_traits;
|
||
|
|
typedef typename regex_traits::char_type char_type;
|
||
|
|
typedef typename regex_traits::string_type string_type;
|
||
|
|
typedef typename regex_traits::locale_type locale_type;
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// constructor
|
||
|
|
explicit compiler_traits(RegexTraits const &traits = RegexTraits())
|
||
|
|
: traits_(traits)
|
||
|
|
, flags_(regex_constants::ECMAScript)
|
||
|
|
, space_(lookup_classname(traits_, "space"))
|
||
|
|
, alnum_(lookup_classname(traits_, "alnum"))
|
||
|
|
{
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// flags
|
||
|
|
regex_constants::syntax_option_type flags() const
|
||
|
|
{
|
||
|
|
return this->flags_;
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// flags
|
||
|
|
void flags(regex_constants::syntax_option_type flags)
|
||
|
|
{
|
||
|
|
this->flags_ = flags;
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// traits
|
||
|
|
regex_traits &traits()
|
||
|
|
{
|
||
|
|
return this->traits_;
|
||
|
|
}
|
||
|
|
|
||
|
|
regex_traits const &traits() const
|
||
|
|
{
|
||
|
|
return this->traits_;
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// imbue
|
||
|
|
locale_type imbue(locale_type const &loc)
|
||
|
|
{
|
||
|
|
locale_type oldloc = this->traits().imbue(loc);
|
||
|
|
this->space_ = lookup_classname(this->traits(), "space");
|
||
|
|
this->alnum_ = lookup_classname(this->traits(), "alnum");
|
||
|
|
return oldloc;
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// getloc
|
||
|
|
locale_type getloc() const
|
||
|
|
{
|
||
|
|
return this->traits().getloc();
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// get_token
|
||
|
|
// get a token and advance the iterator
|
||
|
|
template<typename FwdIter>
|
||
|
|
regex_constants::compiler_token_type get_token(FwdIter &begin, FwdIter end)
|
||
|
|
{
|
||
|
|
using namespace regex_constants;
|
||
|
|
if(this->eat_ws_(begin, end) == end)
|
||
|
|
{
|
||
|
|
return regex_constants::token_end_of_pattern;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch(*begin)
|
||
|
|
{
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '\\'): return this->get_escape_token(++begin, end);
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '.'): ++begin; return token_any;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '^'): ++begin; return token_assert_begin_line;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '$'): ++begin; return token_assert_end_line;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '('): ++begin; return token_group_begin;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, ')'): ++begin; return token_group_end;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '|'): ++begin; return token_alternate;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '['): ++begin; return token_charset_begin;
|
||
|
|
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '*'):
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '+'):
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '?'):
|
||
|
|
return token_invalid_quantifier;
|
||
|
|
|
||
|
|
case BOOST_XPR_CHAR_(char_type, ']'):
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '{'):
|
||
|
|
default:
|
||
|
|
return token_literal;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// get_quant_spec
|
||
|
|
template<typename FwdIter>
|
||
|
|
bool get_quant_spec(FwdIter &begin, FwdIter end, detail::quant_spec &spec)
|
||
|
|
{
|
||
|
|
using namespace regex_constants;
|
||
|
|
FwdIter old_begin;
|
||
|
|
|
||
|
|
if(this->eat_ws_(begin, end) == end)
|
||
|
|
{
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
switch(*begin)
|
||
|
|
{
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '*'):
|
||
|
|
spec.min_ = 0;
|
||
|
|
spec.max_ = (std::numeric_limits<unsigned int>::max)();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '+'):
|
||
|
|
spec.min_ = 1;
|
||
|
|
spec.max_ = (std::numeric_limits<unsigned int>::max)();
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '?'):
|
||
|
|
spec.min_ = 0;
|
||
|
|
spec.max_ = 1;
|
||
|
|
break;
|
||
|
|
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '{'):
|
||
|
|
old_begin = this->eat_ws_(++begin, end);
|
||
|
|
spec.min_ = spec.max_ = detail::toi(begin, end, this->traits());
|
||
|
|
BOOST_XPR_ENSURE_
|
||
|
|
(
|
||
|
|
begin != old_begin && begin != end, error_brace, "invalid quantifier"
|
||
|
|
);
|
||
|
|
|
||
|
|
if(*begin == BOOST_XPR_CHAR_(char_type, ','))
|
||
|
|
{
|
||
|
|
old_begin = this->eat_ws_(++begin, end);
|
||
|
|
spec.max_ = detail::toi(begin, end, this->traits());
|
||
|
|
BOOST_XPR_ENSURE_
|
||
|
|
(
|
||
|
|
begin != end && BOOST_XPR_CHAR_(char_type, '}') == *begin
|
||
|
|
, error_brace, "invalid quantifier"
|
||
|
|
);
|
||
|
|
|
||
|
|
if(begin == old_begin)
|
||
|
|
{
|
||
|
|
spec.max_ = (std::numeric_limits<unsigned int>::max)();
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
BOOST_XPR_ENSURE_
|
||
|
|
(
|
||
|
|
spec.min_ <= spec.max_, error_badbrace, "invalid quantification range"
|
||
|
|
);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
BOOST_XPR_ENSURE_
|
||
|
|
(
|
||
|
|
BOOST_XPR_CHAR_(char_type, '}') == *begin, error_brace, "invalid quantifier"
|
||
|
|
);
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
|
||
|
|
default:
|
||
|
|
return false;
|
||
|
|
}
|
||
|
|
|
||
|
|
spec.greedy_ = true;
|
||
|
|
if(this->eat_ws_(++begin, end) != end && BOOST_XPR_CHAR_(char_type, '?') == *begin)
|
||
|
|
{
|
||
|
|
++begin;
|
||
|
|
spec.greedy_ = false;
|
||
|
|
}
|
||
|
|
|
||
|
|
return true;
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////
|
||
|
|
// get_group_type
|
||
|
|
template<typename FwdIter>
|
||
|
|
regex_constants::compiler_token_type get_group_type(FwdIter &begin, FwdIter end, string_type &name)
|
||
|
|
{
|
||
|
|
using namespace regex_constants;
|
||
|
|
if(this->eat_ws_(begin, end) != end && BOOST_XPR_CHAR_(char_type, '?') == *begin)
|
||
|
|
{
|
||
|
|
this->eat_ws_(++begin, end);
|
||
|
|
BOOST_XPR_ENSURE_(begin != end, error_paren, "incomplete extension");
|
||
|
|
|
||
|
|
switch(*begin)
|
||
|
|
{
|
||
|
|
case BOOST_XPR_CHAR_(char_type, ':'): ++begin; return token_no_mark;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '>'): ++begin; return token_independent_sub_expression;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '#'): ++begin; return token_comment;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '='): ++begin; return token_positive_lookahead;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '!'): ++begin; return token_negative_lookahead;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'R'): ++begin; return token_recurse;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '$'):
|
||
|
|
this->get_name_(++begin, end, name);
|
||
|
|
BOOST_XPR_ENSURE_(begin != end, error_paren, "incomplete extension");
|
||
|
|
if(BOOST_XPR_CHAR_(char_type, '=') == *begin)
|
||
|
|
{
|
||
|
|
++begin;
|
||
|
|
return token_rule_assign;
|
||
|
|
}
|
||
|
|
return token_rule_ref;
|
||
|
|
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '<'):
|
||
|
|
this->eat_ws_(++begin, end);
|
||
|
|
BOOST_XPR_ENSURE_(begin != end, error_paren, "incomplete extension");
|
||
|
|
switch(*begin)
|
||
|
|
{
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '='): ++begin; return token_positive_lookbehind;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '!'): ++begin; return token_negative_lookbehind;
|
||
|
|
default:
|
||
|
|
BOOST_THROW_EXCEPTION(regex_error(error_badbrace, "unrecognized extension"));
|
||
|
|
}
|
||
|
|
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'P'):
|
||
|
|
this->eat_ws_(++begin, end);
|
||
|
|
BOOST_XPR_ENSURE_(begin != end, error_paren, "incomplete extension");
|
||
|
|
switch(*begin)
|
||
|
|
{
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '<'):
|
||
|
|
this->get_name_(++begin, end, name);
|
||
|
|
BOOST_XPR_ENSURE_(begin != end && BOOST_XPR_CHAR_(char_type, '>') == *begin++, error_paren, "incomplete extension");
|
||
|
|
return token_named_mark;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '='):
|
||
|
|
this->get_name_(++begin, end, name);
|
||
|
|
BOOST_XPR_ENSURE_(begin != end, error_paren, "incomplete extension");
|
||
|
|
return token_named_mark_ref;
|
||
|
|
default:
|
||
|
|
BOOST_THROW_EXCEPTION(regex_error(error_badbrace, "unrecognized extension"));
|
||
|
|
}
|
||
|
|
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'i'):
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'm'):
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 's'):
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'x'):
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '-'):
|
||
|
|
return this->parse_mods_(begin, end);
|
||
|
|
|
||
|
|
default:
|
||
|
|
BOOST_THROW_EXCEPTION(regex_error(error_badbrace, "unrecognized extension"));
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return token_literal;
|
||
|
|
}
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////////
|
||
|
|
// get_charset_token
|
||
|
|
// NOTE: white-space is *never* ignored in a charset.
|
||
|
|
template<typename FwdIter>
|
||
|
|
regex_constants::compiler_token_type get_charset_token(FwdIter &begin, FwdIter end)
|
||
|
|
{
|
||
|
|
using namespace regex_constants;
|
||
|
|
BOOST_ASSERT(begin != end);
|
||
|
|
switch(*begin)
|
||
|
|
{
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '^'): ++begin; return token_charset_invert;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '-'): ++begin; return token_charset_hyphen;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, ']'): ++begin; return token_charset_end;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '['):
|
||
|
|
{
|
||
|
|
FwdIter next = begin; ++next;
|
||
|
|
if(next != end)
|
||
|
|
{
|
||
|
|
BOOST_XPR_ENSURE_(
|
||
|
|
*next != BOOST_XPR_CHAR_(char_type, '=')
|
||
|
|
, error_collate
|
||
|
|
, "equivalence classes are not yet supported"
|
||
|
|
);
|
||
|
|
|
||
|
|
BOOST_XPR_ENSURE_(
|
||
|
|
*next != BOOST_XPR_CHAR_(char_type, '.')
|
||
|
|
, error_collate
|
||
|
|
, "collation sequences are not yet supported"
|
||
|
|
);
|
||
|
|
|
||
|
|
if(*next == BOOST_XPR_CHAR_(char_type, ':'))
|
||
|
|
{
|
||
|
|
begin = ++next;
|
||
|
|
return token_posix_charset_begin;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, ':'):
|
||
|
|
{
|
||
|
|
FwdIter next = begin; ++next;
|
||
|
|
if(next != end && *next == BOOST_XPR_CHAR_(char_type, ']'))
|
||
|
|
{
|
||
|
|
begin = ++next;
|
||
|
|
return token_posix_charset_end;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
break;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '\\'):
|
||
|
|
if(++begin != end)
|
||
|
|
{
|
||
|
|
switch(*begin)
|
||
|
|
{
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'b'): ++begin; return token_charset_backspace;
|
||
|
|
default:;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return token_escape;
|
||
|
|
default:;
|
||
|
|
}
|
||
|
|
return token_literal;
|
||
|
|
}
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////////
|
||
|
|
// get_escape_token
|
||
|
|
template<typename FwdIter>
|
||
|
|
regex_constants::compiler_token_type get_escape_token(FwdIter &begin, FwdIter end)
|
||
|
|
{
|
||
|
|
using namespace regex_constants;
|
||
|
|
if(begin != end)
|
||
|
|
{
|
||
|
|
switch(*begin)
|
||
|
|
{
|
||
|
|
//case BOOST_XPR_CHAR_(char_type, 'a'): ++begin; return token_escape_bell;
|
||
|
|
//case BOOST_XPR_CHAR_(char_type, 'c'): ++begin; return token_escape_control;
|
||
|
|
//case BOOST_XPR_CHAR_(char_type, 'e'): ++begin; return token_escape_escape;
|
||
|
|
//case BOOST_XPR_CHAR_(char_type, 'f'): ++begin; return token_escape_formfeed;
|
||
|
|
//case BOOST_XPR_CHAR_(char_type, 'n'): ++begin; return token_escape_newline;
|
||
|
|
//case BOOST_XPR_CHAR_(char_type, 't'): ++begin; return token_escape_horizontal_tab;
|
||
|
|
//case BOOST_XPR_CHAR_(char_type, 'v'): ++begin; return token_escape_vertical_tab;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'A'): ++begin; return token_assert_begin_sequence;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'b'): ++begin; return token_assert_word_boundary;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'B'): ++begin; return token_assert_not_word_boundary;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'E'): ++begin; return token_quote_meta_end;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'Q'): ++begin; return token_quote_meta_begin;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'Z'): ++begin; return token_assert_end_sequence;
|
||
|
|
// Non-standard extension to ECMAScript syntax
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '<'): ++begin; return token_assert_word_begin;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '>'): ++begin; return token_assert_word_end;
|
||
|
|
default:; // fall-through
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return token_escape;
|
||
|
|
}
|
||
|
|
|
||
|
|
private:
|
||
|
|
|
||
|
|
//////////////////////////////////////////////////////////////////////////
|
||
|
|
// parse_mods_
|
||
|
|
template<typename FwdIter>
|
||
|
|
regex_constants::compiler_token_type parse_mods_(FwdIter &begin, FwdIter end)
|
||
|
|
{
|
||
|
|
using namespace regex_constants;
|
||
|
|
bool set = true;
|
||
|
|
do switch(*begin)
|
||
|
|
{
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'i'): this->flag_(set, icase_); break;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'm'): this->flag_(!set, single_line); break;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 's'): this->flag_(!set, not_dot_newline); break;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, 'x'): this->flag_(set, ignore_white_space); break;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, ':'): ++begin; BOOST_FALLTHROUGH;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, ')'): return token_no_mark;
|
||
|
|
case BOOST_XPR_CHAR_(char_type, '-'): if(false == (set = !set)) break; BOOST_FALLTHROUGH;
|
||
|
|
default: BOOST_THROW_EXCEPTION(regex_error(error_paren, "unknown pattern modifier"));
|
||
|
|
}
|
||
|
|
while(BOOST_XPR_ENSURE_(++begin != end, error_paren, "incomplete extension"));
|
||
|
|
// this return is technically unreachable, but this must
|
||
|
|
// be here to work around a bug in gcc 4.0
|
||
|
|
return token_no_mark;
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// flag_
|
||
|
|
void flag_(bool set, regex_constants::syntax_option_type flag)
|
||
|
|
{
|
||
|
|
this->flags_ = set ? (this->flags_ | flag) : (this->flags_ & ~flag);
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////
|
||
|
|
// is_space_
|
||
|
|
bool is_space_(char_type ch) const
|
||
|
|
{
|
||
|
|
return 0 != this->space_ && this->traits().isctype(ch, this->space_);
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////
|
||
|
|
// is_alnum_
|
||
|
|
bool is_alnum_(char_type ch) const
|
||
|
|
{
|
||
|
|
return 0 != this->alnum_ && this->traits().isctype(ch, this->alnum_);
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////
|
||
|
|
// get_name_
|
||
|
|
template<typename FwdIter>
|
||
|
|
void get_name_(FwdIter &begin, FwdIter end, string_type &name)
|
||
|
|
{
|
||
|
|
this->eat_ws_(begin, end);
|
||
|
|
for(name.clear(); begin != end && this->is_alnum_(*begin); ++begin)
|
||
|
|
{
|
||
|
|
name.push_back(*begin);
|
||
|
|
}
|
||
|
|
this->eat_ws_(begin, end);
|
||
|
|
BOOST_XPR_ENSURE_(!name.empty(), regex_constants::error_paren, "incomplete extension");
|
||
|
|
}
|
||
|
|
|
||
|
|
///////////////////////////////////////////////////////////////////////////////
|
||
|
|
// eat_ws_
|
||
|
|
template<typename FwdIter>
|
||
|
|
FwdIter &eat_ws_(FwdIter &begin, FwdIter end)
|
||
|
|
{
|
||
|
|
if(0 != (regex_constants::ignore_white_space & this->flags()))
|
||
|
|
{
|
||
|
|
while(end != begin && (BOOST_XPR_CHAR_(char_type, '#') == *begin || this->is_space_(*begin)))
|
||
|
|
{
|
||
|
|
if(BOOST_XPR_CHAR_(char_type, '#') == *begin++)
|
||
|
|
{
|
||
|
|
while(end != begin && BOOST_XPR_CHAR_(char_type, '\n') != *begin++) {}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
for(; end != begin && this->is_space_(*begin); ++begin) {}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return begin;
|
||
|
|
}
|
||
|
|
|
||
|
|
regex_traits traits_;
|
||
|
|
regex_constants::syntax_option_type flags_;
|
||
|
|
typename regex_traits::char_class_type space_;
|
||
|
|
typename regex_traits::char_class_type alnum_;
|
||
|
|
};
|
||
|
|
|
||
|
|
}} // namespace boost::xpressive
|
||
|
|
|
||
|
|
#endif
|