--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/imgtools/imglib/boostlibrary/boost/regex/v4/basic_regex_parser.hpp Fri Jun 25 18:11:34 2010 +0800
@@ -0,0 +1,2140 @@
+/*
+ *
+ * Copyright (c) 2004
+ * John Maddock
+ *
+ * Use, modification and distribution are subject to 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)
+ *
+ */
+
+ /*
+ * LOCATION: see http://www.boost.org for most recent version.
+ * FILE basic_regex_parser.cpp
+ * VERSION see <boost/version.hpp>
+ * DESCRIPTION: Declares template class basic_regex_parser.
+ */
+
+#ifndef BOOST_REGEX_V4_BASIC_REGEX_PARSER_HPP
+#define BOOST_REGEX_V4_BASIC_REGEX_PARSER_HPP
+
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable: 4103)
+#endif
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_PREFIX
+#endif
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+namespace boost{
+namespace re_detail{
+
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable:4244 4800)
+#endif
+
+template <class charT, class traits>
+class basic_regex_parser : public basic_regex_creator<charT, traits>
+{
+public:
+ basic_regex_parser(regex_data<charT, traits>* data);
+ void parse(const charT* p1, const charT* p2, unsigned flags);
+ void fail(regex_constants::error_type error_code, std::ptrdiff_t position);
+
+ bool parse_all();
+ bool parse_basic();
+ bool parse_extended();
+ bool parse_literal();
+ bool parse_open_paren();
+ bool parse_basic_escape();
+ bool parse_extended_escape();
+ bool parse_match_any();
+ bool parse_repeat(std::size_t low = 0, std::size_t high = (std::numeric_limits<std::size_t>::max)());
+ bool parse_repeat_range(bool isbasic);
+ bool parse_alt();
+ bool parse_set();
+ bool parse_backref();
+ void parse_set_literal(basic_char_set<charT, traits>& char_set);
+ bool parse_inner_set(basic_char_set<charT, traits>& char_set);
+ bool parse_QE();
+ bool parse_perl_extension();
+ bool add_emacs_code(bool negate);
+ bool unwind_alts(std::ptrdiff_t last_paren_start);
+ digraph<charT> get_next_set_literal(basic_char_set<charT, traits>& char_set);
+ charT unescape_character();
+ regex_constants::syntax_option_type parse_options();
+
+private:
+ typedef bool (basic_regex_parser::*parser_proc_type)();
+ typedef typename traits::string_type string_type;
+ typedef typename traits::char_class_type char_class_type;
+ parser_proc_type m_parser_proc; // the main parser to use
+ const charT* m_base; // the start of the string being parsed
+ const charT* m_end; // the end of the string being parsed
+ const charT* m_position; // our current parser position
+ unsigned m_mark_count; // how many sub-expressions we have
+ std::ptrdiff_t m_paren_start; // where the last seen ')' began (where repeats are inserted).
+ std::ptrdiff_t m_alt_insert_point; // where to insert the next alternative
+ bool m_has_case_change; // true if somewhere in the current block the case has changed
+#if defined(BOOST_MSVC) && defined(_M_IX86)
+ // This is an ugly warning suppression workaround (for warnings *inside* std::vector
+ // that can not otherwise be suppressed)...
+ BOOST_STATIC_ASSERT(sizeof(long) >= sizeof(void*));
+ std::vector<long> m_alt_jumps; // list of alternative in the current scope.
+#else
+ std::vector<std::ptrdiff_t> m_alt_jumps; // list of alternative in the current scope.
+#endif
+
+ basic_regex_parser& operator=(const basic_regex_parser&);
+ basic_regex_parser(const basic_regex_parser&);
+};
+
+template <class charT, class traits>
+basic_regex_parser<charT, traits>::basic_regex_parser(regex_data<charT, traits>* data)
+ : basic_regex_creator<charT, traits>(data), m_mark_count(0), m_paren_start(0), m_alt_insert_point(0), m_has_case_change(false)
+{
+}
+
+template <class charT, class traits>
+void basic_regex_parser<charT, traits>::parse(const charT* p1, const charT* p2, unsigned l_flags)
+{
+ // pass l_flags on to base class:
+ this->init(l_flags);
+ // set up pointers:
+ m_position = m_base = p1;
+ m_end = p2;
+ // empty strings are errors:
+ if((p1 == p2) &&
+ (
+ ((l_flags & regbase::main_option_type) != regbase::perl_syntax_group)
+ || (l_flags & regbase::no_empty_expressions)
+ )
+ )
+ {
+ fail(regex_constants::error_empty, 0);
+ return;
+ }
+ // select which parser to use:
+ switch(l_flags & regbase::main_option_type)
+ {
+ case regbase::perl_syntax_group:
+ m_parser_proc = &basic_regex_parser<charT, traits>::parse_extended;
+ break;
+ case regbase::basic_syntax_group:
+ m_parser_proc = &basic_regex_parser<charT, traits>::parse_basic;
+ break;
+ case regbase::literal:
+ m_parser_proc = &basic_regex_parser<charT, traits>::parse_literal;
+ break;
+ }
+
+ // parse all our characters:
+ bool result = parse_all();
+ //
+ // Unwind our alternatives:
+ //
+ unwind_alts(-1);
+ // reset l_flags as a global scope (?imsx) may have altered them:
+ this->flags(l_flags);
+ // if we haven't gobbled up all the characters then we must
+ // have had an unexpected ')' :
+ if(!result)
+ {
+ fail(regex_constants::error_paren, ::boost::re_detail::distance(m_base, m_position));
+ return;
+ }
+ // if an error has been set then give up now:
+ if(this->m_pdata->m_status)
+ return;
+ // fill in our sub-expression count:
+ this->m_pdata->m_mark_count = 1 + m_mark_count;
+ this->finalize(p1, p2);
+}
+
+template <class charT, class traits>
+void basic_regex_parser<charT, traits>::fail(regex_constants::error_type error_code, std::ptrdiff_t position)
+{
+ if(0 == this->m_pdata->m_status) // update the error code if not already set
+ this->m_pdata->m_status = error_code;
+ m_position = m_end; // don't bother parsing anything else
+ // get the error message:
+ std::string message = this->m_pdata->m_ptraits->error_string(error_code);
+ // and raise the exception, this will do nothing if exceptions are disabled:
+#ifndef BOOST_NO_EXCEPTIONS
+ if(0 == (this->flags() & regex_constants::no_except))
+ {
+ boost::regex_error e(message, error_code, position);
+ e.raise();
+ }
+#else
+ (void)position; // suppress warnings.
+#endif
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_all()
+{
+ bool result = true;
+ while(result && (m_position != m_end))
+ {
+ result = (this->*m_parser_proc)();
+ }
+ return result;
+}
+
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable:4702)
+#endif
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_basic()
+{
+ switch(this->m_traits.syntax_type(*m_position))
+ {
+ case regex_constants::syntax_escape:
+ return parse_basic_escape();
+ case regex_constants::syntax_dot:
+ return parse_match_any();
+ case regex_constants::syntax_caret:
+ ++m_position;
+ this->append_state(syntax_element_start_line);
+ break;
+ case regex_constants::syntax_dollar:
+ ++m_position;
+ this->append_state(syntax_element_end_line);
+ break;
+ case regex_constants::syntax_star:
+ if(!(this->m_last_state) || (this->m_last_state->type == syntax_element_start_line))
+ return parse_literal();
+ else
+ {
+ ++m_position;
+ return parse_repeat();
+ }
+ case regex_constants::syntax_plus:
+ if(!(this->m_last_state) || (this->m_last_state->type == syntax_element_start_line) || !(this->flags() & regbase::emacs_ex))
+ return parse_literal();
+ else
+ {
+ ++m_position;
+ return parse_repeat(1);
+ }
+ case regex_constants::syntax_question:
+ if(!(this->m_last_state) || (this->m_last_state->type == syntax_element_start_line) || !(this->flags() & regbase::emacs_ex))
+ return parse_literal();
+ else
+ {
+ ++m_position;
+ return parse_repeat(0, 1);
+ }
+ case regex_constants::syntax_open_set:
+ return parse_set();
+ case regex_constants::syntax_newline:
+ if(this->flags() & regbase::newline_alt)
+ return parse_alt();
+ else
+ return parse_literal();
+ default:
+ return parse_literal();
+ }
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_extended()
+{
+ bool result = true;
+ switch(this->m_traits.syntax_type(*m_position))
+ {
+ case regex_constants::syntax_open_mark:
+ return parse_open_paren();
+ case regex_constants::syntax_close_mark:
+ return false;
+ case regex_constants::syntax_escape:
+ return parse_extended_escape();
+ case regex_constants::syntax_dot:
+ return parse_match_any();
+ case regex_constants::syntax_caret:
+ ++m_position;
+ this->append_state(
+ (this->flags() & regex_constants::no_mod_m ? syntax_element_buffer_start : syntax_element_start_line));
+ break;
+ case regex_constants::syntax_dollar:
+ ++m_position;
+ this->append_state(
+ (this->flags() & regex_constants::no_mod_m ? syntax_element_buffer_end : syntax_element_end_line));
+ break;
+ case regex_constants::syntax_star:
+ if(m_position == this->m_base)
+ {
+ fail(regex_constants::error_badrepeat, 0);
+ return false;
+ }
+ ++m_position;
+ return parse_repeat();
+ case regex_constants::syntax_question:
+ if(m_position == this->m_base)
+ {
+ fail(regex_constants::error_badrepeat, 0);
+ return false;
+ }
+ ++m_position;
+ return parse_repeat(0,1);
+ case regex_constants::syntax_plus:
+ if(m_position == this->m_base)
+ {
+ fail(regex_constants::error_badrepeat, 0);
+ return false;
+ }
+ ++m_position;
+ return parse_repeat(1);
+ case regex_constants::syntax_open_brace:
+ ++m_position;
+ return parse_repeat_range(false);
+ case regex_constants::syntax_close_brace:
+ fail(regex_constants::error_brace, this->m_position - this->m_end);
+ return false;
+ case regex_constants::syntax_or:
+ return parse_alt();
+ case regex_constants::syntax_open_set:
+ return parse_set();
+ case regex_constants::syntax_newline:
+ if(this->flags() & regbase::newline_alt)
+ return parse_alt();
+ else
+ return parse_literal();
+ case regex_constants::syntax_hash:
+ //
+ // If we have a mod_x flag set, then skip until
+ // we get to a newline character:
+ //
+ if((this->flags()
+ & (regbase::no_perl_ex|regbase::mod_x))
+ == regbase::mod_x)
+ {
+ while((m_position != m_end) && !is_separator(*m_position++)){}
+ return true;
+ }
+ // Otherwise fall through:
+ default:
+ result = parse_literal();
+ break;
+ }
+ return result;
+}
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_literal()
+{
+ // append this as a literal provided it's not a space character
+ // or the perl option regbase::mod_x is not set:
+ if(
+ ((this->flags()
+ & (regbase::main_option_type|regbase::mod_x|regbase::no_perl_ex))
+ != regbase::mod_x)
+ || !this->m_traits.isctype(*m_position, this->m_mask_space))
+ this->append_literal(*m_position);
+ ++m_position;
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_open_paren()
+{
+ //
+ // skip the '(' and error check:
+ //
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_paren, m_position - m_base);
+ return false;
+ }
+ //
+ // begin by checking for a perl-style (?...) extension:
+ //
+ if(
+ ((this->flags() & (regbase::main_option_type | regbase::no_perl_ex)) == 0)
+ || ((this->flags() & (regbase::main_option_type | regbase::emacs_ex)) == (regbase::basic_syntax_group|regbase::emacs_ex))
+ )
+ {
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_question)
+ return parse_perl_extension();
+ }
+ //
+ // update our mark count, and append the required state:
+ //
+ unsigned markid = 0;
+ if(0 == (this->flags() & regbase::nosubs))
+ {
+ markid = ++m_mark_count;
+ if(this->flags() & regbase::save_subexpression_location)
+ this->m_pdata->m_subs.push_back(std::pair<std::size_t, std::size_t>(std::distance(m_base, m_position) - 1, 0));
+ }
+ re_brace* pb = static_cast<re_brace*>(this->append_state(syntax_element_startmark, sizeof(re_brace)));
+ pb->index = markid;
+ std::ptrdiff_t last_paren_start = this->getoffset(pb);
+ // back up insertion point for alternations, and set new point:
+ std::ptrdiff_t last_alt_point = m_alt_insert_point;
+ this->m_pdata->m_data.align();
+ m_alt_insert_point = this->m_pdata->m_data.size();
+ //
+ // back up the current flags in case we have a nested (?imsx) group:
+ //
+ regex_constants::syntax_option_type opts = this->flags();
+ bool old_case_change = m_has_case_change;
+ m_has_case_change = false; // no changes to this scope as yet...
+ //
+ // now recursively add more states, this will terminate when we get to a
+ // matching ')' :
+ //
+ parse_all();
+ //
+ // Unwind pushed alternatives:
+ //
+ if(0 == unwind_alts(last_paren_start))
+ return false;
+ //
+ // restore flags:
+ //
+ if(m_has_case_change)
+ {
+ // the case has changed in one or more of the alternatives
+ // within the scoped (...) block: we have to add a state
+ // to reset the case sensitivity:
+ static_cast<re_case*>(
+ this->append_state(syntax_element_toggle_case, sizeof(re_case))
+ )->icase = opts & regbase::icase;
+ }
+ this->flags(opts);
+ m_has_case_change = old_case_change;
+ //
+ // we either have a ')' or we have run out of characters prematurely:
+ //
+ if(m_position == m_end)
+ {
+ this->fail(regex_constants::error_paren, ::boost::re_detail::distance(m_base, m_end));
+ return false;
+ }
+ BOOST_ASSERT(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_mark);
+ if(markid && (this->flags() & regbase::save_subexpression_location))
+ this->m_pdata->m_subs.at(markid - 1).second = std::distance(m_base, m_position);
+ ++m_position;
+ //
+ // append closing parenthesis state:
+ //
+ pb = static_cast<re_brace*>(this->append_state(syntax_element_endmark, sizeof(re_brace)));
+ pb->index = markid;
+ this->m_paren_start = last_paren_start;
+ //
+ // restore the alternate insertion point:
+ //
+ this->m_alt_insert_point = last_alt_point;
+ //
+ // allow backrefs to this mark:
+ //
+ if((markid > 0) && (markid < sizeof(unsigned) * CHAR_BIT))
+ this->m_backrefs |= 1u << (markid - 1);
+
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_basic_escape()
+{
+ ++m_position;
+ bool result = true;
+ switch(this->m_traits.escape_syntax_type(*m_position))
+ {
+ case regex_constants::syntax_open_mark:
+ return parse_open_paren();
+ case regex_constants::syntax_close_mark:
+ return false;
+ case regex_constants::syntax_plus:
+ if(this->flags() & regex_constants::bk_plus_qm)
+ {
+ ++m_position;
+ return parse_repeat(1);
+ }
+ else
+ return parse_literal();
+ case regex_constants::syntax_question:
+ if(this->flags() & regex_constants::bk_plus_qm)
+ {
+ ++m_position;
+ return parse_repeat(0, 1);
+ }
+ else
+ return parse_literal();
+ case regex_constants::syntax_open_brace:
+ if(this->flags() & regbase::no_intervals)
+ return parse_literal();
+ ++m_position;
+ return parse_repeat_range(true);
+ case regex_constants::syntax_close_brace:
+ if(this->flags() & regbase::no_intervals)
+ return parse_literal();
+ fail(regex_constants::error_brace, this->m_position - this->m_base);
+ return false;
+ case regex_constants::syntax_or:
+ if(this->flags() & regbase::bk_vbar)
+ return parse_alt();
+ else
+ result = parse_literal();
+ break;
+ case regex_constants::syntax_digit:
+ return parse_backref();
+ case regex_constants::escape_type_start_buffer:
+ if(this->flags() & regbase::emacs_ex)
+ {
+ ++m_position;
+ this->append_state(syntax_element_buffer_start);
+ }
+ else
+ result = parse_literal();
+ break;
+ case regex_constants::escape_type_end_buffer:
+ if(this->flags() & regbase::emacs_ex)
+ {
+ ++m_position;
+ this->append_state(syntax_element_buffer_end);
+ }
+ else
+ result = parse_literal();
+ break;
+ case regex_constants::escape_type_word_assert:
+ if(this->flags() & regbase::emacs_ex)
+ {
+ ++m_position;
+ this->append_state(syntax_element_word_boundary);
+ }
+ else
+ result = parse_literal();
+ break;
+ case regex_constants::escape_type_not_word_assert:
+ if(this->flags() & regbase::emacs_ex)
+ {
+ ++m_position;
+ this->append_state(syntax_element_within_word);
+ }
+ else
+ result = parse_literal();
+ break;
+ case regex_constants::escape_type_left_word:
+ if(this->flags() & regbase::emacs_ex)
+ {
+ ++m_position;
+ this->append_state(syntax_element_word_start);
+ }
+ else
+ result = parse_literal();
+ break;
+ case regex_constants::escape_type_right_word:
+ if(this->flags() & regbase::emacs_ex)
+ {
+ ++m_position;
+ this->append_state(syntax_element_word_end);
+ }
+ else
+ result = parse_literal();
+ break;
+ default:
+ if(this->flags() & regbase::emacs_ex)
+ {
+ bool negate = true;
+ switch(*m_position)
+ {
+ case 'w':
+ negate = false;
+ // fall through:
+ case 'W':
+ {
+ basic_char_set<charT, traits> char_set;
+ if(negate)
+ char_set.negate();
+ char_set.add_class(this->m_word_mask);
+ if(0 == this->append_set(char_set))
+ {
+ fail(regex_constants::error_ctype, m_position - m_base);
+ return false;
+ }
+ ++m_position;
+ return true;
+ }
+ case 's':
+ negate = false;
+ // fall through:
+ case 'S':
+ return add_emacs_code(negate);
+ case 'c':
+ case 'C':
+ // not supported yet:
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ default:
+ break;
+ }
+ }
+ result = parse_literal();
+ break;
+ }
+ return result;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_extended_escape()
+{
+ ++m_position;
+ bool negate = false; // in case this is a character class escape: \w \d etc
+ switch(this->m_traits.escape_syntax_type(*m_position))
+ {
+ case regex_constants::escape_type_not_class:
+ negate = true;
+ // fall through:
+ case regex_constants::escape_type_class:
+ {
+ typedef typename traits::char_class_type mask_type;
+ mask_type m = this->m_traits.lookup_classname(m_position, m_position+1);
+ if(m != 0)
+ {
+ basic_char_set<charT, traits> char_set;
+ if(negate)
+ char_set.negate();
+ char_set.add_class(m);
+ if(0 == this->append_set(char_set))
+ {
+ fail(regex_constants::error_ctype, m_position - m_base);
+ return false;
+ }
+ ++m_position;
+ return true;
+ }
+ //
+ // not a class, just a regular unknown escape:
+ //
+ this->append_literal(unescape_character());
+ break;
+ }
+ case regex_constants::syntax_digit:
+ return parse_backref();
+ case regex_constants::escape_type_left_word:
+ ++m_position;
+ this->append_state(syntax_element_word_start);
+ break;
+ case regex_constants::escape_type_right_word:
+ ++m_position;
+ this->append_state(syntax_element_word_end);
+ break;
+ case regex_constants::escape_type_start_buffer:
+ ++m_position;
+ this->append_state(syntax_element_buffer_start);
+ break;
+ case regex_constants::escape_type_end_buffer:
+ ++m_position;
+ this->append_state(syntax_element_buffer_end);
+ break;
+ case regex_constants::escape_type_word_assert:
+ ++m_position;
+ this->append_state(syntax_element_word_boundary);
+ break;
+ case regex_constants::escape_type_not_word_assert:
+ ++m_position;
+ this->append_state(syntax_element_within_word);
+ break;
+ case regex_constants::escape_type_Z:
+ ++m_position;
+ this->append_state(syntax_element_soft_buffer_end);
+ break;
+ case regex_constants::escape_type_Q:
+ return parse_QE();
+ case regex_constants::escape_type_C:
+ return parse_match_any();
+ case regex_constants::escape_type_X:
+ ++m_position;
+ this->append_state(syntax_element_combining);
+ break;
+ case regex_constants::escape_type_G:
+ ++m_position;
+ this->append_state(syntax_element_restart_continue);
+ break;
+ case regex_constants::escape_type_not_property:
+ negate = true;
+ // fall through:
+ case regex_constants::escape_type_property:
+ {
+ ++m_position;
+ char_class_type m;
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ }
+ // maybe have \p{ddd}
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_open_brace)
+ {
+ const charT* base = m_position;
+ // skip forward until we find enclosing brace:
+ while((m_position != m_end) && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_brace))
+ ++m_position;
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ }
+ m = this->m_traits.lookup_classname(++base, m_position++);
+ }
+ else
+ {
+ m = this->m_traits.lookup_classname(m_position, m_position+1);
+ ++m_position;
+ }
+ if(m != 0)
+ {
+ basic_char_set<charT, traits> char_set;
+ if(negate)
+ char_set.negate();
+ char_set.add_class(m);
+ if(0 == this->append_set(char_set))
+ {
+ fail(regex_constants::error_ctype, m_position - m_base);
+ return false;
+ }
+ return true;
+ }
+ fail(regex_constants::error_ctype, m_position - m_base);
+ }
+ default:
+ this->append_literal(unescape_character());
+ break;
+ }
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_match_any()
+{
+ //
+ // we have a '.' that can match any character:
+ //
+ ++m_position;
+ static_cast<re_dot*>(
+ this->append_state(syntax_element_wild, sizeof(re_dot))
+ )->mask = static_cast<unsigned char>(this->flags() & regbase::no_mod_s
+ ? re_detail::force_not_newline
+ : this->flags() & regbase::mod_s ?
+ re_detail::force_newline : re_detail::dont_care);
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_repeat(std::size_t low, std::size_t high)
+{
+ bool greedy = true;
+ std::size_t insert_point;
+ //
+ // when we get to here we may have a non-greedy ? mark still to come:
+ //
+ if((m_position != m_end)
+ && (
+ (0 == (this->flags() & (regbase::main_option_type | regbase::no_perl_ex)))
+ || ((regbase::basic_syntax_group|regbase::emacs_ex) == (this->flags() & (regbase::main_option_type | regbase::emacs_ex)))
+ )
+ )
+ {
+ // OK we have a perl regex, check for a '?':
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_question)
+ {
+ greedy = false;
+ ++m_position;
+ }
+ }
+ if(0 == this->m_last_state)
+ {
+ fail(regex_constants::error_badrepeat, ::boost::re_detail::distance(m_base, m_position));
+ return false;
+ }
+ if(this->m_last_state->type == syntax_element_endmark)
+ {
+ // insert a repeat before the '(' matching the last ')':
+ insert_point = this->m_paren_start;
+ }
+ else if((this->m_last_state->type == syntax_element_literal) && (static_cast<re_literal*>(this->m_last_state)->length > 1))
+ {
+ // the last state was a literal with more than one character, split it in two:
+ re_literal* lit = static_cast<re_literal*>(this->m_last_state);
+ charT c = (static_cast<charT*>(static_cast<void*>(lit+1)))[lit->length - 1];
+ --(lit->length);
+ // now append new state:
+ lit = static_cast<re_literal*>(this->append_state(syntax_element_literal, sizeof(re_literal) + sizeof(charT)));
+ lit->length = 1;
+ (static_cast<charT*>(static_cast<void*>(lit+1)))[0] = c;
+ insert_point = this->getoffset(this->m_last_state);
+ }
+ else
+ {
+ // repeat the last state whatever it was, need to add some error checking here:
+ switch(this->m_last_state->type)
+ {
+ case syntax_element_start_line:
+ case syntax_element_end_line:
+ case syntax_element_word_boundary:
+ case syntax_element_within_word:
+ case syntax_element_word_start:
+ case syntax_element_word_end:
+ case syntax_element_buffer_start:
+ case syntax_element_buffer_end:
+ case syntax_element_alt:
+ case syntax_element_soft_buffer_end:
+ case syntax_element_restart_continue:
+ case syntax_element_jump:
+ case syntax_element_startmark:
+ case syntax_element_backstep:
+ // can't legally repeat any of the above:
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ default:
+ // do nothing...
+ break;
+ }
+ insert_point = this->getoffset(this->m_last_state);
+ }
+ //
+ // OK we now know what to repeat, so insert the repeat around it:
+ //
+ re_repeat* rep = static_cast<re_repeat*>(this->insert_state(insert_point, syntax_element_rep, re_repeater_size));
+ rep->min = low;
+ rep->max = high;
+ rep->greedy = greedy;
+ rep->leading = false;
+ // store our repeater position for later:
+ std::ptrdiff_t rep_off = this->getoffset(rep);
+ // and append a back jump to the repeat:
+ re_jump* jmp = static_cast<re_jump*>(this->append_state(syntax_element_jump, sizeof(re_jump)));
+ jmp->alt.i = rep_off - this->getoffset(jmp);
+ this->m_pdata->m_data.align();
+ // now fill in the alt jump for the repeat:
+ rep = static_cast<re_repeat*>(this->getaddress(rep_off));
+ rep->alt.i = this->m_pdata->m_data.size() - rep_off;
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_repeat_range(bool isbasic)
+{
+ //
+ // parse a repeat-range:
+ //
+ std::size_t min, max;
+ int v;
+ // skip whitespace:
+ while((m_position != m_end) && this->m_traits.isctype(*m_position, this->m_mask_space))
+ ++m_position;
+ // fail if at end:
+ if(this->m_position == this->m_end)
+ {
+ fail(regex_constants::error_brace, this->m_position - this->m_base);
+ return false;
+ }
+ // get min:
+ v = this->m_traits.toi(m_position, m_end, 10);
+ // skip whitespace:
+ while((m_position != m_end) && this->m_traits.isctype(*m_position, this->m_mask_space))
+ ++m_position;
+ if(v < 0)
+ {
+ fail(regex_constants::error_badbrace, this->m_position - this->m_base);
+ return false;
+ }
+ else if(this->m_position == this->m_end)
+ {
+ fail(regex_constants::error_brace, this->m_position - this->m_base);
+ return false;
+ }
+ min = v;
+ // see if we have a comma:
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_comma)
+ {
+ // move on and error check:
+ ++m_position;
+ // skip whitespace:
+ while((m_position != m_end) && this->m_traits.isctype(*m_position, this->m_mask_space))
+ ++m_position;
+ if(this->m_position == this->m_end)
+ {
+ fail(regex_constants::error_brace, this->m_position - this->m_base);
+ return false;
+ }
+ // get the value if any:
+ v = this->m_traits.toi(m_position, m_end, 10);
+ max = (v >= 0) ? v : (std::numeric_limits<std::size_t>::max)();
+ }
+ else
+ {
+ // no comma, max = min:
+ max = min;
+ }
+ // skip whitespace:
+ while((m_position != m_end) && this->m_traits.isctype(*m_position, this->m_mask_space))
+ ++m_position;
+ // OK now check trailing }:
+ if(this->m_position == this->m_end)
+ {
+ fail(regex_constants::error_brace, this->m_position - this->m_base);
+ return false;
+ }
+ if(isbasic)
+ {
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_escape)
+ {
+ ++m_position;
+ if(this->m_position == this->m_end)
+ {
+ fail(regex_constants::error_brace, this->m_position - this->m_base);
+ return false;
+ }
+ }
+ else
+ {
+ fail(regex_constants::error_badbrace, this->m_position - this->m_base);
+ return false;
+ }
+ }
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_brace)
+ ++m_position;
+ else
+ {
+ fail(regex_constants::error_badbrace, this->m_position - this->m_base);
+ return false;
+ }
+ //
+ // finally go and add the repeat, unless error:
+ //
+ if(min > max)
+ {
+ fail(regex_constants::error_badbrace, this->m_position - this->m_base);
+ return false;
+ }
+ return parse_repeat(min, max);
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_alt()
+{
+ //
+ // error check: if there have been no previous states,
+ // or if the last state was a '(' then error:
+ //
+ if(
+ ((this->m_last_state == 0) || (this->m_last_state->type == syntax_element_startmark))
+ &&
+ !(
+ ((this->flags() & regbase::main_option_type) == regbase::perl_syntax_group)
+ &&
+ ((this->flags() & regbase::no_empty_expressions) == 0)
+ )
+ )
+ {
+ fail(regex_constants::error_empty, this->m_position - this->m_base);
+ return false;
+ }
+ ++m_position;
+ //
+ // we need to append a trailing jump:
+ //
+ re_syntax_base* pj = this->append_state(re_detail::syntax_element_jump, sizeof(re_jump));
+ std::ptrdiff_t jump_offset = this->getoffset(pj);
+ //
+ // now insert the alternative:
+ //
+ re_alt* palt = static_cast<re_alt*>(this->insert_state(this->m_alt_insert_point, syntax_element_alt, re_alt_size));
+ jump_offset += re_alt_size;
+ this->m_pdata->m_data.align();
+ palt->alt.i = this->m_pdata->m_data.size() - this->getoffset(palt);
+ //
+ // update m_alt_insert_point so that the next alternate gets
+ // inserted at the start of the second of the two we've just created:
+ //
+ this->m_alt_insert_point = this->m_pdata->m_data.size();
+ //
+ // the start of this alternative must have a case changes state
+ // if the current block has messed around with case changes:
+ //
+ if(m_has_case_change)
+ {
+ static_cast<re_case*>(
+ this->append_state(syntax_element_toggle_case, sizeof(re_case))
+ )->icase = this->m_icase;
+ }
+ //
+ // push the alternative onto our stack, a recursive
+ // implementation here is easier to understand (and faster
+ // as it happens), but causes all kinds of stack overflow problems
+ // on programs with small stacks (COM+).
+ //
+ m_alt_jumps.push_back(jump_offset);
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_set()
+{
+ ++m_position;
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ basic_char_set<charT, traits> char_set;
+
+ const charT* base = m_position; // where the '[' was
+ const charT* item_base = m_position; // where the '[' or '^' was
+
+ while(m_position != m_end)
+ {
+ switch(this->m_traits.syntax_type(*m_position))
+ {
+ case regex_constants::syntax_caret:
+ if(m_position == base)
+ {
+ char_set.negate();
+ ++m_position;
+ item_base = m_position;
+ }
+ else
+ parse_set_literal(char_set);
+ break;
+ case regex_constants::syntax_close_set:
+ if(m_position == item_base)
+ {
+ parse_set_literal(char_set);
+ break;
+ }
+ else
+ {
+ ++m_position;
+ if(0 == this->append_set(char_set))
+ {
+ fail(regex_constants::error_range, m_position - m_base);
+ return false;
+ }
+ }
+ return true;
+ case regex_constants::syntax_open_set:
+ if(parse_inner_set(char_set))
+ break;
+ return true;
+ case regex_constants::syntax_escape:
+ {
+ //
+ // look ahead and see if this is a character class shortcut
+ // \d \w \s etc...
+ //
+ ++m_position;
+ if(this->m_traits.escape_syntax_type(*m_position)
+ == regex_constants::escape_type_class)
+ {
+ char_class_type m = this->m_traits.lookup_classname(m_position, m_position+1);
+ if(m != 0)
+ {
+ char_set.add_class(m);
+ ++m_position;
+ break;
+ }
+ }
+ else if(this->m_traits.escape_syntax_type(*m_position)
+ == regex_constants::escape_type_not_class)
+ {
+ // negated character class:
+ char_class_type m = this->m_traits.lookup_classname(m_position, m_position+1);
+ if(m != 0)
+ {
+ char_set.add_negated_class(m);
+ ++m_position;
+ break;
+ }
+ }
+ // not a character class, just a regular escape:
+ --m_position;
+ parse_set_literal(char_set);
+ break;
+ }
+ default:
+ parse_set_literal(char_set);
+ break;
+ }
+ }
+ return m_position != m_end;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_inner_set(basic_char_set<charT, traits>& char_set)
+{
+ //
+ // we have either a character class [:name:]
+ // a collating element [.name.]
+ // or an equivalence class [=name=]
+ //
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ switch(this->m_traits.syntax_type(*m_position))
+ {
+ case regex_constants::syntax_dot:
+ //
+ // a collating element is treated as a literal:
+ //
+ --m_position;
+ parse_set_literal(char_set);
+ return true;
+ case regex_constants::syntax_colon:
+ {
+ // check that character classes are actually enabled:
+ if((this->flags() & (regbase::main_option_type | regbase::no_char_classes))
+ == (regbase::basic_syntax_group | regbase::no_char_classes))
+ {
+ --m_position;
+ parse_set_literal(char_set);
+ return true;
+ }
+ // skip the ':'
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ const charT* name_first = m_position;
+ // skip at least one character, then find the matching ':]'
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ while((m_position != m_end)
+ && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_colon))
+ ++m_position;
+ const charT* name_last = m_position;
+ if(m_end == m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ if((m_end == ++m_position)
+ || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_set))
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ //
+ // check for negated class:
+ //
+ bool negated = false;
+ if(this->m_traits.syntax_type(*name_first) == regex_constants::syntax_caret)
+ {
+ ++name_first;
+ negated = true;
+ }
+ typedef typename traits::char_class_type mask_type;
+ mask_type m = this->m_traits.lookup_classname(name_first, name_last);
+ if(m == 0)
+ {
+ if(char_set.empty() && (name_last - name_first == 1))
+ {
+ // maybe a special case:
+ ++m_position;
+ if( (m_position != m_end)
+ && (this->m_traits.syntax_type(*m_position)
+ == regex_constants::syntax_close_set))
+ {
+ if(this->m_traits.escape_syntax_type(*name_first)
+ == regex_constants::escape_type_left_word)
+ {
+ ++m_position;
+ this->append_state(syntax_element_word_start);
+ return false;
+ }
+ if(this->m_traits.escape_syntax_type(*name_first)
+ == regex_constants::escape_type_right_word)
+ {
+ ++m_position;
+ this->append_state(syntax_element_word_end);
+ return false;
+ }
+ }
+ }
+ fail(regex_constants::error_ctype, name_first - m_base);
+ return false;
+ }
+ if(negated == false)
+ char_set.add_class(m);
+ else
+ char_set.add_negated_class(m);
+ ++m_position;
+ break;
+ }
+ case regex_constants::syntax_equal:
+ {
+ // skip the '='
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ const charT* name_first = m_position;
+ // skip at least one character, then find the matching '=]'
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ while((m_position != m_end)
+ && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_equal))
+ ++m_position;
+ const charT* name_last = m_position;
+ if(m_end == m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ if((m_end == ++m_position)
+ || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_set))
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return false;
+ }
+ string_type m = this->m_traits.lookup_collatename(name_first, name_last);
+ if((0 == m.size()) || (m.size() > 2))
+ {
+ fail(regex_constants::error_collate, name_first - m_base);
+ return false;
+ }
+ digraph<charT> d;
+ d.first = m[0];
+ if(m.size() > 1)
+ d.second = m[1];
+ else
+ d.second = 0;
+ char_set.add_equivalent(d);
+ ++m_position;
+ break;
+ }
+ default:
+ --m_position;
+ parse_set_literal(char_set);
+ break;
+ }
+ return true;
+}
+
+template <class charT, class traits>
+void basic_regex_parser<charT, traits>::parse_set_literal(basic_char_set<charT, traits>& char_set)
+{
+ digraph<charT> start_range(get_next_set_literal(char_set));
+ if(m_end == m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return;
+ }
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_dash)
+ {
+ // we have a range:
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return;
+ }
+ if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_set)
+ {
+ digraph<charT> end_range = get_next_set_literal(char_set);
+ char_set.add_range(start_range, end_range);
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_dash)
+ {
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_brack, m_position - m_base);
+ return;
+ }
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_set)
+ {
+ // trailing - :
+ --m_position;
+ return;
+ }
+ fail(regex_constants::error_range, m_position - m_base);
+ return;
+ }
+ return;
+ }
+ --m_position;
+ }
+ char_set.add_single(start_range);
+}
+
+template <class charT, class traits>
+digraph<charT> basic_regex_parser<charT, traits>::get_next_set_literal(basic_char_set<charT, traits>& char_set)
+{
+ digraph<charT> result;
+ switch(this->m_traits.syntax_type(*m_position))
+ {
+ case regex_constants::syntax_dash:
+ if(!char_set.empty())
+ {
+ // see if we are at the end of the set:
+ if((++m_position == m_end) || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_set))
+ {
+ fail(regex_constants::error_range, m_position - m_base);
+ return result;
+ }
+ --m_position;
+ }
+ result.first = *m_position++;
+ return result;
+ case regex_constants::syntax_escape:
+ // check to see if escapes are supported first:
+ if(this->flags() & regex_constants::no_escape_in_lists)
+ {
+ result = *m_position++;
+ break;
+ }
+ ++m_position;
+ result = unescape_character();
+ break;
+ case regex_constants::syntax_open_set:
+ {
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_collate, m_position - m_base);
+ return result;
+ }
+ if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_dot)
+ {
+ --m_position;
+ result.first = *m_position;
+ ++m_position;
+ return result;
+ }
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_collate, m_position - m_base);
+ return result;
+ }
+ const charT* name_first = m_position;
+ // skip at least one character, then find the matching ':]'
+ if(m_end == ++m_position)
+ {
+ fail(regex_constants::error_collate, name_first - m_base);
+ return result;
+ }
+ while((m_position != m_end)
+ && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_dot))
+ ++m_position;
+ const charT* name_last = m_position;
+ if(m_end == m_position)
+ {
+ fail(regex_constants::error_collate, name_first - m_base);
+ return result;
+ }
+ if((m_end == ++m_position)
+ || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_set))
+ {
+ fail(regex_constants::error_collate, name_first - m_base);
+ return result;
+ }
+ ++m_position;
+ string_type s = this->m_traits.lookup_collatename(name_first, name_last);
+ if(s.empty() || (s.size() > 2))
+ {
+ fail(regex_constants::error_collate, name_first - m_base);
+ return result;
+ }
+ result.first = s[0];
+ if(s.size() > 1)
+ result.second = s[1];
+ else
+ result.second = 0;
+ return result;
+ }
+ default:
+ result = *m_position++;
+ }
+ return result;
+}
+
+//
+// does a value fit in the specified charT type?
+//
+template <class charT>
+bool valid_value(charT, int v, const mpl::true_&)
+{
+ return (v >> (sizeof(charT) * CHAR_BIT)) == 0;
+}
+template <class charT>
+bool valid_value(charT, int, const mpl::false_&)
+{
+ return true; // v will alsways fit in a charT
+}
+template <class charT>
+bool valid_value(charT c, int v)
+{
+ return valid_value(c, v, mpl::bool_<(sizeof(charT) < sizeof(int))>());
+}
+
+template <class charT, class traits>
+charT basic_regex_parser<charT, traits>::unescape_character()
+{
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable:4127)
+#endif
+ charT result(0);
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ }
+ switch(this->m_traits.escape_syntax_type(*m_position))
+ {
+ case regex_constants::escape_type_control_a:
+ result = charT('\a');
+ break;
+ case regex_constants::escape_type_e:
+ result = charT(27);
+ break;
+ case regex_constants::escape_type_control_f:
+ result = charT('\f');
+ break;
+ case regex_constants::escape_type_control_n:
+ result = charT('\n');
+ break;
+ case regex_constants::escape_type_control_r:
+ result = charT('\r');
+ break;
+ case regex_constants::escape_type_control_t:
+ result = charT('\t');
+ break;
+ case regex_constants::escape_type_control_v:
+ result = charT('\v');
+ break;
+ case regex_constants::escape_type_word_assert:
+ result = charT('\b');
+ break;
+ case regex_constants::escape_type_ascii_control:
+ ++m_position;
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return result;
+ }
+ /*
+ if((*m_position < charT('@'))
+ || (*m_position > charT(125)) )
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return result;
+ }
+ */
+ result = static_cast<charT>(*m_position % 32);
+ break;
+ case regex_constants::escape_type_hex:
+ ++m_position;
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return result;
+ }
+ // maybe have \x{ddd}
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_open_brace)
+ {
+ ++m_position;
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return result;
+ }
+ int i = this->m_traits.toi(m_position, m_end, 16);
+ if((m_position == m_end)
+ || (i < 0)
+ || ((std::numeric_limits<charT>::is_specialized) && (charT(i) > (std::numeric_limits<charT>::max)()))
+ || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_brace))
+ {
+ fail(regex_constants::error_badbrace, m_position - m_base);
+ return result;
+ }
+ ++m_position;
+ result = charT(i);
+ }
+ else
+ {
+ std::ptrdiff_t len = (std::min)(static_cast<std::ptrdiff_t>(2), m_end - m_position);
+ int i = this->m_traits.toi(m_position, m_position + len, 16);
+ if((i < 0)
+ || !valid_value(charT(0), i))
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return result;
+ }
+ result = charT(i);
+ }
+ return result;
+ case regex_constants::syntax_digit:
+ {
+ // an octal escape sequence, the first character must be a zero
+ // followed by up to 3 octal digits:
+ std::ptrdiff_t len = (std::min)(::boost::re_detail::distance(m_position, m_end), static_cast<std::ptrdiff_t>(4));
+ const charT* bp = m_position;
+ int val = this->m_traits.toi(bp, bp + 1, 8);
+ if(val != 0)
+ {
+ // Oops not an octal escape after all:
+ fail(regex_constants::error_escape, m_position - m_base);
+ return result;
+ }
+ val = this->m_traits.toi(m_position, m_position + len, 8);
+ if(val < 0)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return result;
+ }
+ return static_cast<charT>(val);
+ }
+ case regex_constants::escape_type_named_char:
+ {
+ ++m_position;
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ }
+ // maybe have \N{name}
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_open_brace)
+ {
+ const charT* base = m_position;
+ // skip forward until we find enclosing brace:
+ while((m_position != m_end) && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_brace))
+ ++m_position;
+ if(m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ }
+ string_type s = this->m_traits.lookup_collatename(++base, m_position++);
+ if(s.empty())
+ {
+ fail(regex_constants::error_collate, m_position - m_base);
+ return false;
+ }
+ if(s.size() == 1)
+ {
+ return s[0];
+ }
+ }
+ // fall through is a failure:
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ }
+ default:
+ result = *m_position;
+ break;
+ }
+ ++m_position;
+ return result;
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_backref()
+{
+ BOOST_ASSERT(m_position != m_end);
+ const charT* pc = m_position;
+ int i = this->m_traits.toi(pc, pc + 1, 10);
+ if((i == 0) || (((this->flags() & regbase::main_option_type) == regbase::perl_syntax_group) && (this->flags() & regbase::no_bk_refs)))
+ {
+ // not a backref at all but an octal escape sequence:
+ charT c = unescape_character();
+ this->append_literal(c);
+ }
+ else if((i > 0) && (this->m_backrefs & (1u << (i-1))))
+ {
+ m_position = pc;
+ re_brace* pb = static_cast<re_brace*>(this->append_state(syntax_element_backref, sizeof(re_brace)));
+ pb->index = i;
+ }
+ else
+ {
+ fail(regex_constants::error_backref, m_position - m_end);
+ return false;
+ }
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_QE()
+{
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable:4127)
+#endif
+ //
+ // parse a \Q...\E sequence:
+ //
+ ++m_position; // skip the Q
+ const charT* start = m_position;
+ const charT* end;
+ do
+ {
+ while((m_position != m_end)
+ && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape))
+ ++m_position;
+ if(m_position == m_end)
+ {
+ // a \Q...\E sequence may terminate with the end of the expression:
+ end = m_position;
+ break;
+ }
+ if(++m_position == m_end) // skip the escape
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ }
+ // check to see if it's a \E:
+ if(this->m_traits.escape_syntax_type(*m_position) == regex_constants::escape_type_E)
+ {
+ ++m_position;
+ end = m_position - 2;
+ break;
+ }
+ // otherwise go round again:
+ }while(true);
+ //
+ // now add all the character between the two escapes as literals:
+ //
+ while(start != end)
+ {
+ this->append_literal(*start);
+ ++start;
+ }
+ return true;
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::parse_perl_extension()
+{
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ //
+ // treat comments as a special case, as these
+ // are the only ones that don't start with a leading
+ // startmark state:
+ //
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_hash)
+ {
+ while((m_position != m_end)
+ && (this->m_traits.syntax_type(*m_position++) != regex_constants::syntax_close_mark))
+ {}
+ return true;
+ }
+ //
+ // backup some state, and prepare the way:
+ //
+ int markid = 0;
+ std::ptrdiff_t jump_offset = 0;
+ re_brace* pb = static_cast<re_brace*>(this->append_state(syntax_element_startmark, sizeof(re_brace)));
+ std::ptrdiff_t last_paren_start = this->getoffset(pb);
+ // back up insertion point for alternations, and set new point:
+ std::ptrdiff_t last_alt_point = m_alt_insert_point;
+ this->m_pdata->m_data.align();
+ m_alt_insert_point = this->m_pdata->m_data.size();
+ std::ptrdiff_t expected_alt_point = m_alt_insert_point;
+ bool restore_flags = true;
+ regex_constants::syntax_option_type old_flags = this->flags();
+ bool old_case_change = m_has_case_change;
+ m_has_case_change = false;
+ //
+ // select the actual extension used:
+ //
+ switch(this->m_traits.syntax_type(*m_position))
+ {
+ case regex_constants::syntax_colon:
+ //
+ // a non-capturing mark:
+ //
+ pb->index = markid = 0;
+ ++m_position;
+ break;
+ case regex_constants::syntax_equal:
+ pb->index = markid = -1;
+ ++m_position;
+ jump_offset = this->getoffset(this->append_state(syntax_element_jump, sizeof(re_jump)));
+ this->m_pdata->m_data.align();
+ m_alt_insert_point = this->m_pdata->m_data.size();
+ break;
+ case regex_constants::syntax_not:
+ pb->index = markid = -2;
+ ++m_position;
+ jump_offset = this->getoffset(this->append_state(syntax_element_jump, sizeof(re_jump)));
+ this->m_pdata->m_data.align();
+ m_alt_insert_point = this->m_pdata->m_data.size();
+ break;
+ case regex_constants::escape_type_left_word:
+ {
+ // a lookbehind assertion:
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ regex_constants::syntax_type t = this->m_traits.syntax_type(*m_position);
+ if(t == regex_constants::syntax_not)
+ pb->index = markid = -2;
+ else if(t == regex_constants::syntax_equal)
+ pb->index = markid = -1;
+ else
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ ++m_position;
+ jump_offset = this->getoffset(this->append_state(syntax_element_jump, sizeof(re_jump)));
+ this->append_state(syntax_element_backstep, sizeof(re_brace));
+ this->m_pdata->m_data.align();
+ m_alt_insert_point = this->m_pdata->m_data.size();
+ break;
+ }
+ case regex_constants::escape_type_right_word:
+ //
+ // an independent sub-expression:
+ //
+ pb->index = markid = -3;
+ ++m_position;
+ jump_offset = this->getoffset(this->append_state(syntax_element_jump, sizeof(re_jump)));
+ this->m_pdata->m_data.align();
+ m_alt_insert_point = this->m_pdata->m_data.size();
+ break;
+ case regex_constants::syntax_open_mark:
+ {
+ // a conditional expression:
+ pb->index = markid = -4;
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ int v = this->m_traits.toi(m_position, m_end, 10);
+ if(v > 0)
+ {
+ re_brace* br = static_cast<re_brace*>(this->append_state(syntax_element_assert_backref, sizeof(re_brace)));
+ br->index = v;
+ if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark)
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ }
+ else
+ {
+ // verify that we have a lookahead or lookbehind assert:
+ if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_question)
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::escape_type_left_word)
+ {
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ if((this->m_traits.syntax_type(*m_position) != regex_constants::syntax_equal)
+ && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_not))
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ m_position -= 3;
+ }
+ else
+ {
+ if((this->m_traits.syntax_type(*m_position) != regex_constants::syntax_equal)
+ && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_not))
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ m_position -= 2;
+ }
+ }
+ break;
+ }
+ case regex_constants::syntax_close_mark:
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ default:
+ //
+ // lets assume that we have a (?imsx) group and try and parse it:
+ //
+ regex_constants::syntax_option_type opts = parse_options();
+ if(m_position == m_end)
+ return false;
+ // make a note of whether we have a case change:
+ m_has_case_change = ((opts & regbase::icase) != (this->flags() & regbase::icase));
+ pb->index = markid = 0;
+ if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_mark)
+ {
+ // update flags and carry on as normal:
+ this->flags(opts);
+ restore_flags = false;
+ old_case_change |= m_has_case_change; // defer end of scope by one ')'
+ }
+ else if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_colon)
+ {
+ // update flags and carry on until the matching ')' is found:
+ this->flags(opts);
+ ++m_position;
+ }
+ else
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+
+ // finally append a case change state if we need it:
+ if(m_has_case_change)
+ {
+ static_cast<re_case*>(
+ this->append_state(syntax_element_toggle_case, sizeof(re_case))
+ )->icase = opts & regbase::icase;
+ }
+
+ }
+ //
+ // now recursively add more states, this will terminate when we get to a
+ // matching ')' :
+ //
+ parse_all();
+ //
+ // Unwind alternatives:
+ //
+ if(0 == unwind_alts(last_paren_start))
+ return false;
+ //
+ // we either have a ')' or we have run out of characters prematurely:
+ //
+ if(m_position == m_end)
+ {
+ this->fail(regex_constants::error_paren, ::boost::re_detail::distance(m_base, m_end));
+ return false;
+ }
+ BOOST_ASSERT(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_mark);
+ ++m_position;
+ //
+ // restore the flags:
+ //
+ if(restore_flags)
+ {
+ // append a case change state if we need it:
+ if(m_has_case_change)
+ {
+ static_cast<re_case*>(
+ this->append_state(syntax_element_toggle_case, sizeof(re_case))
+ )->icase = old_flags & regbase::icase;
+ }
+ this->flags(old_flags);
+ }
+ //
+ // set up the jump pointer if we have one:
+ //
+ if(jump_offset)
+ {
+ this->m_pdata->m_data.align();
+ re_jump* jmp = static_cast<re_jump*>(this->getaddress(jump_offset));
+ jmp->alt.i = this->m_pdata->m_data.size() - this->getoffset(jmp);
+ if(this->m_last_state == jmp)
+ {
+ // Oops... we didn't have anything inside the assertion:
+ fail(regex_constants::error_empty, m_position - m_base);
+ return false;
+ }
+ }
+ //
+ // verify that if this is conditional expression, that we do have
+ // an alternative, if not add one:
+ //
+ if(markid == -4)
+ {
+ re_syntax_base* b = this->getaddress(expected_alt_point);
+ // Make sure we have exactly one alternative following this state:
+ if(b->type != syntax_element_alt)
+ {
+ re_alt* alt = static_cast<re_alt*>(this->insert_state(expected_alt_point, syntax_element_alt, sizeof(re_alt)));
+ alt->alt.i = this->m_pdata->m_data.size() - this->getoffset(alt);
+ }
+ else if(this->getaddress(static_cast<re_alt*>(b)->alt.i, b)->type == syntax_element_alt)
+ {
+ fail(regex_constants::error_bad_pattern, m_position - m_base);
+ return false;
+ }
+ // check for invalid repetition of next state:
+ b = this->getaddress(expected_alt_point);
+ b = this->getaddress(static_cast<re_alt*>(b)->next.i, b);
+ if((b->type != syntax_element_assert_backref)
+ && (b->type != syntax_element_startmark))
+ {
+ fail(regex_constants::error_badrepeat, m_position - m_base);
+ return false;
+ }
+ }
+ //
+ // append closing parenthesis state:
+ //
+ pb = static_cast<re_brace*>(this->append_state(syntax_element_endmark, sizeof(re_brace)));
+ pb->index = markid;
+ this->m_paren_start = last_paren_start;
+ //
+ // restore the alternate insertion point:
+ //
+ this->m_alt_insert_point = last_alt_point;
+ //
+ // and the case change data:
+ //
+ m_has_case_change = old_case_change;
+ return true;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::add_emacs_code(bool negate)
+{
+ //
+ // parses an emacs style \sx or \Sx construct.
+ //
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_escape, m_position - m_base);
+ return false;
+ }
+ basic_char_set<charT, traits> char_set;
+ if(negate)
+ char_set.negate();
+
+ static const charT s_punct[5] = { 'p', 'u', 'n', 'c', 't', };
+
+ switch(*m_position)
+ {
+ case 's':
+ case ' ':
+ char_set.add_class(this->m_mask_space);
+ break;
+ case 'w':
+ char_set.add_class(this->m_word_mask);
+ break;
+ case '_':
+ char_set.add_single(digraph<charT>(charT('$')));
+ char_set.add_single(digraph<charT>(charT('&')));
+ char_set.add_single(digraph<charT>(charT('*')));
+ char_set.add_single(digraph<charT>(charT('+')));
+ char_set.add_single(digraph<charT>(charT('-')));
+ char_set.add_single(digraph<charT>(charT('_')));
+ char_set.add_single(digraph<charT>(charT('<')));
+ char_set.add_single(digraph<charT>(charT('>')));
+ break;
+ case '.':
+ char_set.add_class(this->m_traits.lookup_classname(s_punct, s_punct+5));
+ break;
+ case '(':
+ char_set.add_single(digraph<charT>(charT('(')));
+ char_set.add_single(digraph<charT>(charT('[')));
+ char_set.add_single(digraph<charT>(charT('{')));
+ break;
+ case ')':
+ char_set.add_single(digraph<charT>(charT(')')));
+ char_set.add_single(digraph<charT>(charT(']')));
+ char_set.add_single(digraph<charT>(charT('}')));
+ break;
+ case '"':
+ char_set.add_single(digraph<charT>(charT('"')));
+ char_set.add_single(digraph<charT>(charT('\'')));
+ char_set.add_single(digraph<charT>(charT('`')));
+ break;
+ case '\'':
+ char_set.add_single(digraph<charT>(charT('\'')));
+ char_set.add_single(digraph<charT>(charT(',')));
+ char_set.add_single(digraph<charT>(charT('#')));
+ break;
+ case '<':
+ char_set.add_single(digraph<charT>(charT(';')));
+ break;
+ case '>':
+ char_set.add_single(digraph<charT>(charT('\n')));
+ char_set.add_single(digraph<charT>(charT('\f')));
+ break;
+ default:
+ fail(regex_constants::error_ctype, m_position - m_base);
+ return false;
+ }
+ if(0 == this->append_set(char_set))
+ {
+ fail(regex_constants::error_ctype, m_position - m_base);
+ return false;
+ }
+ ++m_position;
+ return true;
+}
+
+template <class charT, class traits>
+regex_constants::syntax_option_type basic_regex_parser<charT, traits>::parse_options()
+{
+ // we have a (?imsx-imsx) group, convert it into a set of flags:
+ regex_constants::syntax_option_type f = this->flags();
+ bool breakout = false;
+ do
+ {
+ switch(*m_position)
+ {
+ case 's':
+ f |= regex_constants::mod_s;
+ f &= ~regex_constants::no_mod_s;
+ break;
+ case 'm':
+ f &= ~regex_constants::no_mod_m;
+ break;
+ case 'i':
+ f |= regex_constants::icase;
+ break;
+ case 'x':
+ f |= regex_constants::mod_x;
+ break;
+ default:
+ breakout = true;
+ continue;
+ }
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_paren, m_position - m_base);
+ return false;
+ }
+ }
+ while(!breakout);
+
+ if(*m_position == static_cast<charT>('-'))
+ {
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_paren, m_position - m_base);
+ return false;
+ }
+ do
+ {
+ switch(*m_position)
+ {
+ case 's':
+ f &= ~regex_constants::mod_s;
+ f |= regex_constants::no_mod_s;
+ break;
+ case 'm':
+ f |= regex_constants::no_mod_m;
+ break;
+ case 'i':
+ f &= ~regex_constants::icase;
+ break;
+ case 'x':
+ f &= ~regex_constants::mod_x;
+ break;
+ default:
+ breakout = true;
+ continue;
+ }
+ if(++m_position == m_end)
+ {
+ fail(regex_constants::error_paren, m_position - m_base);
+ return false;
+ }
+ }
+ while(!breakout);
+ }
+ return f;
+}
+
+template <class charT, class traits>
+bool basic_regex_parser<charT, traits>::unwind_alts(std::ptrdiff_t last_paren_start)
+{
+ //
+ // If we didn't actually add any states after the last
+ // alternative then that's an error:
+ //
+ if((this->m_alt_insert_point == static_cast<std::ptrdiff_t>(this->m_pdata->m_data.size()))
+ && m_alt_jumps.size() && (m_alt_jumps.back() > last_paren_start)
+ &&
+ !(
+ ((this->flags() & regbase::main_option_type) == regbase::perl_syntax_group)
+ &&
+ ((this->flags() & regbase::no_empty_expressions) == 0)
+ )
+ )
+ {
+ fail(regex_constants::error_empty, this->m_position - this->m_base);
+ return false;
+ }
+ //
+ // Fix up our alternatives:
+ //
+ while(m_alt_jumps.size() && (m_alt_jumps.back() > last_paren_start))
+ {
+ //
+ // fix up the jump to point to the end of the states
+ // that we've just added:
+ //
+ std::ptrdiff_t jump_offset = m_alt_jumps.back();
+ m_alt_jumps.pop_back();
+ this->m_pdata->m_data.align();
+ re_jump* jmp = static_cast<re_jump*>(this->getaddress(jump_offset));
+ BOOST_ASSERT(jmp->type == syntax_element_jump);
+ jmp->alt.i = this->m_pdata->m_data.size() - jump_offset;
+ }
+ return true;
+}
+
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+} // namespace re_detail
+} // namespace boost
+
+#ifdef BOOST_MSVC
+#pragma warning(push)
+#pragma warning(disable: 4103)
+#endif
+#ifdef BOOST_HAS_ABI_HEADERS
+# include BOOST_ABI_SUFFIX
+#endif
+#ifdef BOOST_MSVC
+#pragma warning(pop)
+#endif
+
+#endif