FCL/sf/os/ossrv: comparison ossrv_pub/boost_apis/boost/xpressive/regex

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+///////////////////////////////////////////////////////////////////////////////
+/// \file regex_compiler.hpp
+/// Contains the definition of regex_compiler, a factory for building regex objects
+/// from strings.
+//
+//  Copyright 2004 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_REGEX_COMPILER_HPP_EAN_10_04_2005
+#define BOOST_XPRESSIVE_REGEX_COMPILER_HPP_EAN_10_04_2005
+// MS compatible compilers support #pragma once
+#if defined(_MSC_VER) && (_MSC_VER >= 1020)
+# pragma once
+#endif
+#include <boost/xpressive/basic_regex.hpp>
+#include <boost/xpressive/detail/dynamic/parser.hpp>
+#include <boost/xpressive/detail/dynamic/parse_charset.hpp>
+#include <boost/xpressive/detail/dynamic/parser_enum.hpp>
+#include <boost/xpressive/detail/dynamic/parser_traits.hpp>
+#include <boost/xpressive/detail/core/linker.hpp>
+#include <boost/xpressive/detail/core/optimize.hpp>
+namespace boost { namespace xpressive
+{
+///////////////////////////////////////////////////////////////////////////////
+// regex_compiler
+//
+/// \brief Class template regex_compiler is a factory for building basic_regex objects from a string.
+///
+/// Class template regex_compiler is used to construct a basic_regex object from a string. The string
+/// should contain a valid regular expression. You can imbue a regex_compiler object with a locale,
+/// after which all basic_regex objects created with that regex_compiler object will use that locale.
+/// After creating a regex_compiler object, and optionally imbueing it with a locale, you can call the
+/// compile() method to construct a basic_regex object, passing it the string representing the regular
+/// expression. You can call compile() multiple times on the same regex_compiler object. Two basic_regex
+/// objects compiled from the same string will have different regex_id's.
+template<typename BidiIter, typename RegexTraits, typename CompilerTraits>
+struct regex_compiler
+{
+typedef BidiIter iterator_type;
+typedef typename iterator_value<BidiIter>::type char_type;
+typedef std::basic_string<char_type> string_type;
+typedef regex_constants::syntax_option_type flag_type;
+typedef RegexTraits traits_type;
+typedef typename traits_type::char_class_type char_class_type;
+typedef typename traits_type::locale_type locale_type;
+explicit regex_compiler(RegexTraits const &traits = RegexTraits())
+: mark_count_(0)
+, hidden_mark_count_(0)
+, traits_(traits)
+, upper_(0)
+{
+this->upper_ = lookup_classname(this->rxtraits(), "upper");
+BOOST_ASSERT(0 != this->upper_);
+}
+///////////////////////////////////////////////////////////////////////////
+// imbue
+/// Specify the locale to be used by a regex_compiler.
+///
+/// \param loc The locale that this regex_compiler should use.
+/// \return The previous locale.
+locale_type imbue(locale_type loc)
+{
+locale_type oldloc = this->traits_.imbue(loc);
+this->upper_ = lookup_classname(this->rxtraits(), "upper");
+BOOST_ASSERT(0 != this->upper_);
+return oldloc;
+}
+///////////////////////////////////////////////////////////////////////////
+// getloc
+/// Get the locale used by a regex_compiler.
+///
+/// \param loc The locale that this regex_compiler uses.
+locale_type getloc() const
+{
+return this->traits_.getloc();
+}
+///////////////////////////////////////////////////////////////////////////
+// compile
+/// Builds a basic_regex object from a std::string.
+///
+/// \param  pat A std::string containing the regular expression pattern.
+/// \param  flags Optional bitmask that determines how the pat string is interpreted. (See syntax_option_type.)
+/// \return A basic_regex object corresponding to the regular expression represented by the string.
+/// \pre    The std::string pat contains a valid string-based representation of a regular expression.
+/// \throw  regex_error when the string has invalid regular expression syntax.
+basic_regex<BidiIter> compile(string_type pat, flag_type flags = regex_constants::ECMAScript)
+{
+this->reset();
+this->traits_.flags(flags);
+string_iterator begin = pat.begin(), end = pat.end();
+// at the top level, a regex is a sequence of alternates
+alternates_list alternates;
+this->parse_alternates(begin, end, alternates);
+detail::ensure(begin == end, regex_constants::error_paren, "mismatched parenthesis");
+// convert the alternates list to the appropriate matcher and terminate the sequence
+detail::sequence<BidiIter> seq = detail::alternates_to_matchable(alternates, alternates_factory());
+seq += detail::make_dynamic_xpression<BidiIter>(detail::end_matcher());
+// fill in the back-pointers by visiting the regex parse tree
+detail::xpression_linker<char_type> linker(this->rxtraits());
+seq.first->link(linker);
+// bundle the regex information into a regex_impl object
+detail::regex_impl<BidiIter> impl;
+impl.xpr_ = seq.first;
+impl.traits_.reset(new RegexTraits(this->rxtraits()));
+impl.mark_count_ = this->mark_count_;
+impl.hidden_mark_count_ = this->hidden_mark_count_;
+// optimization: get the peek chars OR the boyer-moore search string
+detail::optimize_regex(impl, this->rxtraits(), detail::is_random<BidiIter>());
+return detail::core_access<BidiIter>::make_regex(impl);
+}
+private:
+typedef typename string_type::const_iterator string_iterator;
+typedef std::list<detail::sequence<BidiIter> > alternates_list;
+typedef detail::escape_value<char_type, char_class_type> escape_value;
+typedef detail::alternates_factory_impl<BidiIter, traits_type> alternates_factory;
+///////////////////////////////////////////////////////////////////////////
+// reset
+/// INTERNAL ONLY
+void reset()
+{
+this->mark_count_ = 0;
+this->hidden_mark_count_ = 0;
+this->traits_.flags(regex_constants::ECMAScript);
+}
+///////////////////////////////////////////////////////////////////////////
+// regex_traits
+/// INTERNAL ONLY
+traits_type &rxtraits()
+{
+return this->traits_.traits();
+}
+///////////////////////////////////////////////////////////////////////////
+// regex_traits
+/// INTERNAL ONLY
+traits_type const &rxtraits() const
+{
+return this->traits_.traits();
+}
+///////////////////////////////////////////////////////////////////////////
+// parse_alternates
+/// INTERNAL ONLY
+void parse_alternates(string_iterator &begin, string_iterator end, alternates_list &alternates)
+{
+using namespace regex_constants;
+string_iterator old_begin;
+do
+{
+alternates.push_back(this->parse_sequence(begin, end));
+old_begin = begin;
+}
+while(begin != end && token_alternate == this->traits_.get_token(begin, end));
+begin = old_begin;
+}
+///////////////////////////////////////////////////////////////////////////
+// parse_group
+/// INTERNAL ONLY
+detail::sequence<BidiIter> parse_group(string_iterator &begin, string_iterator end)
+{
+using namespace regex_constants;
+int mark_nbr = 0;
+bool keeper = false;
+bool lookahead = false;
+bool lookbehind = false;
+bool negative = false;
+std::size_t old_mark_count = this->mark_count_;
+detail::sequence<BidiIter> seq, seq_end;
+string_iterator tmp = string_iterator();
+syntax_option_type old_flags = this->traits_.flags();
+switch(this->traits_.get_group_type(begin, end))
+{
+case token_no_mark:
+// Don't process empty groups like (?:) or (?i)
+// BUGBUG this doesn't handle the degenerate (?:)+ correctly
+if(token_group_end == this->traits_.get_token(tmp = begin, end))
+{
+return this->parse_atom(begin = tmp, end);
+}
+break;
+case token_negative_lookahead:
+negative = true; // fall-through
+case token_positive_lookahead:
+lookahead = true;
+seq_end = detail::make_dynamic_xpression<BidiIter>(detail::true_matcher());
+break;
+case token_negative_lookbehind:
+negative = true; // fall-through
+case token_positive_lookbehind:
+lookbehind = true;
+seq_end = detail::make_dynamic_xpression<BidiIter>(detail::true_matcher());
+break;
+case token_independent_sub_expression:
+keeper = true;
+seq_end = detail::make_dynamic_xpression<BidiIter>(detail::true_matcher());
+break;
+case token_comment:
+while(detail::ensure(begin != end, error_paren, "mismatched parenthesis"))
+{
+switch(this->traits_.get_token(begin, end))
+{
+case token_group_end: return this->parse_atom(begin, end);
+case token_escape: detail::ensure(begin != end, error_escape, "incomplete escape sequence");
+case token_literal: ++begin;
+default:;
+}
+}
+break;
+default:
+mark_nbr = static_cast<int>(++this->mark_count_);
+seq = detail::make_dynamic_xpression<BidiIter>(detail::mark_begin_matcher(mark_nbr));
+seq_end = detail::make_dynamic_xpression<BidiIter>(detail::mark_end_matcher(mark_nbr));
+break;
+}
+// alternates
+alternates_list alternates;
+this->parse_alternates(begin, end, alternates);
+detail::ensure
+(
+begin != end && token_group_end == this->traits_.get_token(begin, end)
+, error_paren
+, "mismatched parenthesis"
+);
+seq += detail::alternates_to_matchable(alternates, alternates_factory());
+seq += seq_end;
+typedef shared_ptr<detail::matchable<BidiIter> const> xpr_type;
+bool do_save = (this->mark_count_ != old_mark_count);
+if(lookahead)
+{
+detail::lookahead_matcher<xpr_type> lookahead(seq.first, negative, do_save);
+seq = detail::make_dynamic_xpression<BidiIter>(lookahead);
+}
+else if(lookbehind)
+{
+detail::lookbehind_matcher<xpr_type> lookbehind(seq.first, negative, do_save);
+seq = detail::make_dynamic_xpression<BidiIter>(lookbehind);
+}
+else if(keeper) // independent sub-expression
+{
+detail::keeper_matcher<xpr_type> keeper(seq.first, do_save);
+seq = detail::make_dynamic_xpression<BidiIter>(keeper);
+}
+// restore the modifiers
+this->traits_.flags(old_flags);
+return seq;
+}
+///////////////////////////////////////////////////////////////////////////
+// parse_charset
+/// INTERNAL ONLY
+detail::sequence<BidiIter> parse_charset(string_iterator &begin, string_iterator end)
+{
+detail::compound_charset<traits_type> chset;
+// call out to a helper to actually parse the character set
+detail::parse_charset(begin, end, chset, this->traits_);
+return detail::make_charset_xpression<BidiIter>
+(
+chset
+, this->rxtraits()
+, this->traits_.flags()
+);
+}
+///////////////////////////////////////////////////////////////////////////
+// parse_atom
+/// INTERNAL ONLY
+detail::sequence<BidiIter> parse_atom(string_iterator &begin, string_iterator end)
+{
+using namespace regex_constants;
+escape_value esc = { 0, 0, 0, detail::escape_char };
+string_iterator old_begin = begin;
+switch(this->traits_.get_token(begin, end))
+{
+case token_literal:
+return detail::make_literal_xpression<BidiIter>
+(
+this->parse_literal(begin, end), this->traits_.flags(), this->rxtraits()
+);
+case token_any:
+return detail::make_any_xpression<BidiIter>(this->traits_.flags(), this->rxtraits());
+case token_assert_begin_sequence:
+return detail::make_dynamic_xpression<BidiIter>(detail::assert_bos_matcher());
+case token_assert_end_sequence:
+return detail::make_dynamic_xpression<BidiIter>(detail::assert_eos_matcher());
+case token_assert_begin_line:
+return detail::make_assert_begin_line<BidiIter>(this->traits_.flags(), this->rxtraits());
+case token_assert_end_line:
+return detail::make_assert_end_line<BidiIter>(this->traits_.flags(), this->rxtraits());
+case token_assert_word_boundary:
+return detail::make_assert_word<BidiIter>(detail::word_boundary<true>(), this->rxtraits());
+case token_assert_not_word_boundary:
+return detail::make_assert_word<BidiIter>(detail::word_boundary<false>(), this->rxtraits());
+case token_assert_word_begin:
+return detail::make_assert_word<BidiIter>(detail::word_begin(), this->rxtraits());
+case token_assert_word_end:
+return detail::make_assert_word<BidiIter>(detail::word_end(), this->rxtraits());
+case token_escape:
+esc = this->parse_escape(begin, end);
+switch(esc.type_)
+{
+case detail::escape_mark:
+return detail::make_backref_xpression<BidiIter>
+(
+esc.mark_nbr_, this->traits_.flags(), this->rxtraits()
+);
+case detail::escape_char:
+return detail::make_char_xpression<BidiIter>
+(
+esc.ch_, this->traits_.flags(), this->rxtraits()
+);
+case detail::escape_class:
+return detail::make_posix_charset_xpression<BidiIter>
+(
+esc.class_
+, this->rxtraits().isctype(*begin++, this->upper_)
+, this->traits_.flags()
+, this->rxtraits()
+);
+}
+case token_group_begin:
+return this->parse_group(begin, end);
+case token_charset_begin:
+return this->parse_charset(begin, end);
+case token_invalid_quantifier:
+throw regex_error(error_badrepeat, "quantifier not expected");
+case token_quote_meta_begin:
+return detail::make_literal_xpression<BidiIter>
+(
+this->parse_quote_meta(begin, end), this->traits_.flags(), this->rxtraits()
+);
+case token_quote_meta_end:
+throw regex_error
+(
+error_escape
+, "found quote-meta end without corresponding quote-meta begin"
+);
+case token_end_of_pattern:
+break;
+default:
+begin = old_begin;
+break;
+}
+return detail::sequence<BidiIter>();
+}
+///////////////////////////////////////////////////////////////////////////
+// parse_quant
+/// INTERNAL ONLY
+detail::sequence<BidiIter> parse_quant(string_iterator &begin, string_iterator end)
+{
+BOOST_ASSERT(begin != end);
+detail::quant_spec spec = { 0, 0, false };
+detail::sequence<BidiIter> seq = this->parse_atom(begin, end);
+// BUGBUG this doesn't handle the degenerate (?:)+ correctly
+if(!seq.is_empty() && begin != end && seq.first->is_quantifiable())
+{
+if(this->traits_.get_quant_spec(begin, end, spec))
+{
+BOOST_ASSERT(spec.min_ <= spec.max_);
+if(0 == spec.max_) // quant {0,0} is degenerate -- matches nothing.
+{
+seq = this->parse_quant(begin, end);
+}
+else
+{
+seq = seq.first->quantify(spec, this->hidden_mark_count_, seq, alternates_factory());
+}
+}
+}
+return seq;
+}
+///////////////////////////////////////////////////////////////////////////
+// parse_sequence
+/// INTERNAL ONLY
+detail::sequence<BidiIter> parse_sequence(string_iterator &begin, string_iterator end)
+{
+detail::sequence<BidiIter> seq;
+while(begin != end)
+{
+detail::sequence<BidiIter> seq_quant = this->parse_quant(begin, end);
+// did we find a quantified atom?
+if(seq_quant.is_empty())
+break;
+// chain it to the end of the xpression sequence
+seq += seq_quant;
+}
+return seq;
+}
+///////////////////////////////////////////////////////////////////////////
+// parse_literal
+//  scan ahead looking for char literals to be globbed together into a string literal
+/// INTERNAL ONLY
+string_type parse_literal(string_iterator &begin, string_iterator end)
+{
+using namespace regex_constants;
+BOOST_ASSERT(begin != end);
+BOOST_ASSERT(token_literal == this->traits_.get_token(begin, end));
+escape_value esc = { 0, 0, 0, detail::escape_char };
+string_type literal(1, *begin);
+for(string_iterator prev = begin, tmp = ++begin; begin != end; prev = begin, begin = tmp)
+{
+detail::quant_spec spec;
+if(this->traits_.get_quant_spec(tmp, end, spec))
+{
+if(literal.size() != 1)
+{
+begin = prev;
+literal.erase(literal.size() - 1);
+}
+return literal;
+}
+else switch(this->traits_.get_token(tmp, end))
+{
+case token_escape:
+esc = this->parse_escape(tmp, end);
+if(detail::escape_char != esc.type_) return literal;
+literal += esc.ch_;
+break;
+case token_literal:
+literal += *tmp++;
+break;
+default:
+return literal;
+}
+}
+return literal;
+}
+///////////////////////////////////////////////////////////////////////////
+// parse_quote_meta
+//  scan ahead looking for char literals to be globbed together into a string literal
+/// INTERNAL ONLY
+string_type parse_quote_meta(string_iterator &begin, string_iterator end)
+{
+using namespace regex_constants;
+string_iterator old_begin = begin, old_end;
+while(end != (old_end = begin))
+{
+switch(this->traits_.get_token(begin, end))
+{
+case token_quote_meta_end: return string_type(old_begin, old_end);
+case token_escape: detail::ensure(begin != end, error_escape, "incomplete escape sequence");
+case token_literal: ++begin;
+default:;
+}
+}
+return string_type(old_begin, begin);
+}
+///////////////////////////////////////////////////////////////////////////////
+// parse_escape
+/// INTERNAL ONLY
+escape_value parse_escape(string_iterator &begin, string_iterator end)
+{
+detail::ensure(begin != end, regex_constants::error_escape, "incomplete escape sequence");
+// first, check to see if this can be a backreference
+if(0 < this->rxtraits().value(*begin, 10))
+{
+// Parse at most 3 decimal digits.
+string_iterator tmp = begin;
+int mark_nbr = detail::toi(tmp, end, this->rxtraits(), 10, 999);
+// If the resulting number could conceivably be a backref, then it is.
+if(10 > mark_nbr || mark_nbr <= static_cast<int>(this->mark_count_))
+{
+begin = tmp;
+escape_value esc = {0, mark_nbr, 0, detail::escape_mark};
+return esc;
+}
+}
+// Not a backreference, defer to the parse_escape helper
+return detail::parse_escape(begin, end, this->traits_);
+}
+std::size_t mark_count_;
+std::size_t hidden_mark_count_;
+CompilerTraits traits_;
+typename RegexTraits::char_class_type upper_;
+};
+}} // namespace boost::xpressive
+#endif