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Diffstat (limited to 'cutl/details/boost/regex/v4/basic_regex_parser.hpp')
| -rw-r--r-- | cutl/details/boost/regex/v4/basic_regex_parser.hpp | 2874 |
1 files changed, 0 insertions, 2874 deletions
diff --git a/cutl/details/boost/regex/v4/basic_regex_parser.hpp b/cutl/details/boost/regex/v4/basic_regex_parser.hpp deleted file mode 100644 index 9182da2..0000000 --- a/cutl/details/boost/regex/v4/basic_regex_parser.hpp +++ /dev/null @@ -1,2874 +0,0 @@ -/* - * - * 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 <cutl/details/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 cutl_details_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); - void fail(regex_constants::error_type error_code, std::ptrdiff_t position, std::string message, std::ptrdiff_t start_pos); - void fail(regex_constants::error_type error_code, std::ptrdiff_t position, const std::string& message) - { - fail(error_code, position, message, 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 - int m_mark_reset; // used to indicate that we're inside a (?|...) block. - unsigned m_max_mark; // largest mark count seen inside a (?|...) block. - 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_mark_reset(-1), m_max_mark(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; - // - // Add a leading paren with index zero to give recursions a target: - // - re_brace* br = static_cast<re_brace*>(this->append_state(syntax_element_startmark, sizeof(re_brace))); - br->index = 0; - br->icase = this->flags() & regbase::icase; - 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; - default: - // Ooops, someone has managed to set more than one of the main option flags, - // so this must be an error: - fail(regex_constants::error_unknown, 0, "An invalid combination of regular expression syntax flags was used."); - return; - } - - // 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, ::cutl_details_boost::re_detail::distance(m_base, m_position), "Found a closing ) with no corresponding openening parenthesis."); - 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) -{ - // get the error message: - std::string message = this->m_pdata->m_ptraits->error_string(error_code); - fail(error_code, position, message); -} - -template <class charT, class traits> -void basic_regex_parser<charT, traits>::fail(regex_constants::error_type error_code, std::ptrdiff_t position, std::string message, std::ptrdiff_t start_pos) -{ - 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 - -#ifndef BOOST_NO_TEMPLATED_ITERATOR_CONSTRUCTORS - // - // Augment error message with the regular expression text: - // - if(start_pos == position) - start_pos = (std::max)(static_cast<std::ptrdiff_t>(0), position - static_cast<std::ptrdiff_t>(10)); - std::ptrdiff_t end_pos = (std::min)(position + static_cast<std::ptrdiff_t>(10), static_cast<std::ptrdiff_t>(m_end - m_base)); - if(error_code != regex_constants::error_empty) - { - if((start_pos != 0) || (end_pos != (m_end - m_base))) - message += " The error occurred while parsing the regular expression fragment: '"; - else - message += " The error occurred while parsing the regular expression: '"; - if(start_pos != end_pos) - { - message += std::string(m_base + start_pos, m_base + position); - message += ">>>HERE>>>"; - message += std::string(m_base + position, m_base + end_pos); - } - message += "'."; - } -#endif - -#ifndef BOOST_NO_EXCEPTIONS - if(0 == (this->flags() & regex_constants::no_except)) - { - cutl_details_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, "The repeat operator \"*\" cannot start a regular expression."); - return false; - } - ++m_position; - return parse_repeat(); - case regex_constants::syntax_question: - if(m_position == this->m_base) - { - fail(regex_constants::error_badrepeat, 0, "The repeat operator \"?\" cannot start a regular expression."); - 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, "The repeat operator \"+\" cannot start a regular expression."); - 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_base, "Found a closing repetition operator } with no corresponding {."); - 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; - } - BOOST_FALLTHROUGH; - 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; -#ifndef BOOST_NO_STD_DISTANCE - 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)); -#else - if(this->flags() & regbase::save_subexpression_location) - this->m_pdata->m_subs.push_back(std::pair<std::size_t, std::size_t>((m_position - m_base) - 1, 0)); -#endif - } - re_brace* pb = static_cast<re_brace*>(this->append_state(syntax_element_startmark, sizeof(re_brace))); - pb->index = markid; - pb->icase = this->flags() & regbase::icase; - 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... - // - // Back up branch reset data in case we have a nested (?|...) - // - int mark_reset = m_mark_reset; - m_mark_reset = -1; - // - // 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; - // - // restore branch reset: - // - m_mark_reset = mark_reset; - // - // we either have a ')' or we have run out of characters prematurely: - // - if(m_position == m_end) - { - this->fail(regex_constants::error_paren, ::cutl_details_boost::re_detail::distance(m_base, m_end)); - return false; - } - BOOST_ASSERT(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_mark); -#ifndef BOOST_NO_STD_DISTANCE - if(markid && (this->flags() & regbase::save_subexpression_location)) - this->m_pdata->m_subs.at(markid - 1).second = std::distance(m_base, m_position); -#else - if(markid && (this->flags() & regbase::save_subexpression_location)) - this->m_pdata->m_subs.at(markid - 1).second = (m_position - m_base); -#endif - ++m_position; - // - // append closing parenthesis state: - // - pb = static_cast<re_brace*>(this->append_state(syntax_element_endmark, sizeof(re_brace))); - pb->index = markid; - pb->icase = this->flags() & regbase::icase; - 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, "Found a closing repetition operator } with no corresponding {."); - 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; - BOOST_FALLTHROUGH; - 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; - BOOST_FALLTHROUGH; - case 'S': - return add_emacs_code(negate); - case 'c': - case 'C': - // not supported yet: - fail(regex_constants::error_escape, m_position - m_base, "The \\c and \\C escape sequences are not supported by POSIX basic regular expressions: try the Perl syntax instead."); - 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; - if(m_position == m_end) - { - fail(regex_constants::error_escape, m_position - m_base, "Incomplete escape sequence found."); - return false; - } - 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; - BOOST_FALLTHROUGH; - case regex_constants::escape_type_class: - { -escape_type_class_jump: - typedef typename traits::char_class_type m_type; - m_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; - BOOST_FALLTHROUGH; - 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, "Incomplete property escape found."); - 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, "Closing } missing from property escape sequence."); - 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, "Escape sequence was neither a valid property nor a valid character class name."); - return false; - } - case regex_constants::escape_type_reset_start_mark: - if(0 == (this->flags() & (regbase::main_option_type | regbase::no_perl_ex))) - { - re_brace* pb = static_cast<re_brace*>(this->append_state(syntax_element_startmark, sizeof(re_brace))); - pb->index = -5; - pb->icase = this->flags() & regbase::icase; - this->m_pdata->m_data.align(); - ++m_position; - return true; - } - goto escape_type_class_jump; - case regex_constants::escape_type_line_ending: - if(0 == (this->flags() & (regbase::main_option_type | regbase::no_perl_ex))) - { - const charT* e = get_escape_R_string<charT>(); - const charT* old_position = m_position; - const charT* old_end = m_end; - const charT* old_base = m_base; - m_position = e; - m_base = e; - m_end = e + traits::length(e); - bool r = parse_all(); - m_position = ++old_position; - m_end = old_end; - m_base = old_base; - return r; - } - goto escape_type_class_jump; - case regex_constants::escape_type_extended_backref: - if(0 == (this->flags() & (regbase::main_option_type | regbase::no_perl_ex))) - { - bool have_brace = false; - bool negative = false; - static const char* incomplete_message = "Incomplete \\g escape found."; - if(++m_position == m_end) - { - fail(regex_constants::error_escape, m_position - m_base, incomplete_message); - return false; - } - // maybe have \g{ddd} - regex_constants::syntax_type syn = this->m_traits.syntax_type(*m_position); - regex_constants::syntax_type syn_end = 0; - if((syn == regex_constants::syntax_open_brace) - || (syn == regex_constants::escape_type_left_word) - || (syn == regex_constants::escape_type_end_buffer)) - { - if(++m_position == m_end) - { - fail(regex_constants::error_escape, m_position - m_base, incomplete_message); - return false; - } - have_brace = true; - switch(syn) - { - case regex_constants::syntax_open_brace: - syn_end = regex_constants::syntax_close_brace; - break; - case regex_constants::escape_type_left_word: - syn_end = regex_constants::escape_type_right_word; - break; - default: - syn_end = regex_constants::escape_type_end_buffer; - break; - } - } - negative = (*m_position == static_cast<charT>('-')); - if((negative) && (++m_position == m_end)) - { - fail(regex_constants::error_escape, m_position - m_base, incomplete_message); - return false; - } - const charT* pc = m_position; - int i = this->m_traits.toi(pc, m_end, 10); - if((i < 0) && syn_end) - { - // Check for a named capture, get the leftmost one if there is more than one: - const charT* base = m_position; - while((m_position != m_end) && (this->m_traits.syntax_type(*m_position) != syn_end)) - { - ++m_position; - } - i = hash_value_from_capture_name(base, m_position); - pc = m_position; - } - if(negative) - i = 1 + m_mark_count - i; - if(((i > 0) && (this->m_backrefs & (1u << (i-1)))) || ((i > 10000) && (this->m_pdata->get_id(i) > 0) && (this->m_backrefs & (1u << (this->m_pdata->get_id(i)-1))))) - { - m_position = pc; - re_brace* pb = static_cast<re_brace*>(this->append_state(syntax_element_backref, sizeof(re_brace))); - pb->index = i; - pb->icase = this->flags() & regbase::icase; - } - else - { - fail(regex_constants::error_backref, m_position - m_base); - return false; - } - m_position = pc; - if(have_brace) - { - if((m_position == m_end) || (this->m_traits.syntax_type(*m_position) != syn_end)) - { - fail(regex_constants::error_escape, m_position - m_base, incomplete_message); - return false; - } - ++m_position; - } - return true; - } - goto escape_type_class_jump; - case regex_constants::escape_type_control_v: - if(0 == (this->flags() & (regbase::main_option_type | regbase::no_perl_ex))) - goto escape_type_class_jump; - BOOST_FALLTHROUGH; - 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; - bool pocessive = false; - 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 or emacs regex, check for a '?': - if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_question) - { - greedy = false; - ++m_position; - } - // for perl regexes only check for pocessive ++ repeats. - if((m_position != m_end) - && (0 == (this->flags() & regbase::main_option_type)) - && (this->m_traits.syntax_type(*m_position) == regex_constants::syntax_plus)) - { - pocessive = true; - ++m_position; - } - } - if(0 == this->m_last_state) - { - fail(regex_constants::error_badrepeat, ::cutl_details_boost::re_detail::distance(m_base, m_position), "Nothing to repeat."); - 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; - // - // If the repeat is pocessive then bracket the repeat with a (?>...) - // independent sub-expression construct: - // - if(pocessive) - { - if(m_position != m_end) - { - // - // Check for illegal following quantifier, we have to do this here, because - // the extra states we insert below circumvents our usual error checking :-( - // - switch(this->m_traits.syntax_type(*m_position)) - { - case regex_constants::syntax_star: - case regex_constants::syntax_plus: - case regex_constants::syntax_question: - case regex_constants::syntax_open_brace: - fail(regex_constants::error_badrepeat, m_position - m_base); - return false; - } - } - re_brace* pb = static_cast<re_brace*>(this->insert_state(insert_point, syntax_element_startmark, sizeof(re_brace))); - pb->index = -3; - pb->icase = this->flags() & regbase::icase; - jmp = static_cast<re_jump*>(this->insert_state(insert_point + sizeof(re_brace), syntax_element_jump, sizeof(re_jump))); - this->m_pdata->m_data.align(); - jmp->alt.i = this->m_pdata->m_data.size() - this->getoffset(jmp); - pb = static_cast<re_brace*>(this->append_state(syntax_element_endmark, sizeof(re_brace))); - pb->index = -3; - pb->icase = this->flags() & regbase::icase; - } - return true; -} - -template <class charT, class traits> -bool basic_regex_parser<charT, traits>::parse_repeat_range(bool isbasic) -{ - static const char* incomplete_message = "Missing } in quantified repetition."; - // - // 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; - if(this->m_position == this->m_end) - { - if(this->flags() & (regbase::main_option_type | regbase::no_perl_ex)) - { - fail(regex_constants::error_brace, this->m_position - this->m_base, incomplete_message); - return false; - } - // Treat the opening '{' as a literal character, rewind to start of error: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_brace) --m_position; - return parse_literal(); - } - // get min: - v = this->m_traits.toi(m_position, m_end, 10); - // skip whitespace: - if(v < 0) - { - if(this->flags() & (regbase::main_option_type | regbase::no_perl_ex)) - { - fail(regex_constants::error_brace, this->m_position - this->m_base, incomplete_message); - return false; - } - // Treat the opening '{' as a literal character, rewind to start of error: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_brace) --m_position; - return parse_literal(); - } - while((m_position != m_end) && this->m_traits.isctype(*m_position, this->m_mask_space)) - ++m_position; - if(this->m_position == this->m_end) - { - if(this->flags() & (regbase::main_option_type | regbase::no_perl_ex)) - { - fail(regex_constants::error_brace, this->m_position - this->m_base, incomplete_message); - return false; - } - // Treat the opening '{' as a literal character, rewind to start of error: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_brace) --m_position; - return parse_literal(); - } - 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) - { - if(this->flags() & (regbase::main_option_type | regbase::no_perl_ex)) - { - fail(regex_constants::error_brace, this->m_position - this->m_base, incomplete_message); - return false; - } - // Treat the opening '{' as a literal character, rewind to start of error: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_brace) --m_position; - return parse_literal(); - } - // get the value if any: - v = this->m_traits.toi(m_position, m_end, 10); - max = (v >= 0) ? (std::size_t)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) - { - if(this->flags() & (regbase::main_option_type | regbase::no_perl_ex)) - { - fail(regex_constants::error_brace, this->m_position - this->m_base, incomplete_message); - return false; - } - // Treat the opening '{' as a literal character, rewind to start of error: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_brace) --m_position; - return parse_literal(); - } - 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, incomplete_message); - return false; - } - } - else - { - fail(regex_constants::error_brace, this->m_position - this->m_base, incomplete_message); - return false; - } - } - if(this->m_traits.syntax_type(*m_position) == regex_constants::syntax_close_brace) - ++m_position; - else - { - // Treat the opening '{' as a literal character, rewind to start of error: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_brace) --m_position; - return parse_literal(); - } - // - // finally go and add the repeat, unless error: - // - if(min > max) - { - // Backtrack to error location: - m_position -= 2; - while(this->m_traits.isctype(*m_position, this->m_word_mask)) --m_position; - ++m_position; - fail(regex_constants::error_badbrace, m_position - 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, "A regular expression can start with the alternation operator |."); - return false; - } - // - // Reset mark count if required: - // - if(m_max_mark < m_mark_count) - m_max_mark = m_mark_count; - if(m_mark_reset >= 0) - m_mark_count = m_mark_reset; - - ++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() -{ - static const char* incomplete_message = "Character set declaration starting with [ terminated prematurely - either no ] was found or the set had no content."; - ++m_position; - if(m_position == m_end) - { - fail(regex_constants::error_brack, m_position - m_base, incomplete_message); - 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_ctype, 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) -{ - static const char* incomplete_message = "Character class declaration starting with [ terminated prematurely - either no ] was found or the set had no content."; - // - // 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, incomplete_message); - 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, incomplete_message); - 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, incomplete_message); - 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, incomplete_message); - 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, incomplete_message); - 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 m_type; - m_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, incomplete_message); - 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, incomplete_message); - 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, incomplete_message); - 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, incomplete_message); - 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, "Escape sequence terminated prematurely."); - 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) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - fail(regex_constants::error_escape, m_position - m_base, "ASCII escape sequence terminated prematurely."); - return result; - } - result = static_cast<charT>(*m_position % 32); - break; - case regex_constants::escape_type_hex: - ++m_position; - if(m_position == m_end) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - fail(regex_constants::error_escape, m_position - m_base, "Hexadecimal escape sequence terminated prematurely."); - 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) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - fail(regex_constants::error_escape, m_position - m_base, "Missing } in hexadecimal escape sequence."); - 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) && (i > (int)(std::numeric_limits<charT>::max)())) - || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_brace)) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - fail(regex_constants::error_badbrace, m_position - m_base, "Hexadecimal escape sequence was invalid."); - return result; - } - ++m_position; - result = charT(i); - } - else - { - std::ptrdiff_t len = (std::min)(static_cast<std::ptrdiff_t>(2), static_cast<std::ptrdiff_t>(m_end - m_position)); - int i = this->m_traits.toi(m_position, m_position + len, 16); - if((i < 0) - || !valid_value(charT(0), i)) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - fail(regex_constants::error_escape, m_position - m_base, "Escape sequence did not encode a valid character."); - 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)(::cutl_details_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) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - // Oops not an octal escape after all: - fail(regex_constants::error_escape, m_position - m_base, "Invalid octal escape sequence."); - return result; - } - val = this->m_traits.toi(m_position, m_position + len, 8); - if(val < 0) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - fail(regex_constants::error_escape, m_position - m_base, "Octal escape sequence is invalid."); - return result; - } - return static_cast<charT>(val); - } - case regex_constants::escape_type_named_char: - { - ++m_position; - if(m_position == m_end) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - 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) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - 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()) - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - fail(regex_constants::error_collate, m_position - m_base); - return false; - } - if(s.size() == 1) - { - return s[0]; - } - } - // fall through is a failure: - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - 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; - pb->icase = this->flags() & regbase::icase; - } - else - { - // Rewind to start of escape: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - fail(regex_constants::error_backref, m_position - m_base); - 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, "Unterminated \\Q...\\E sequence."); - 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) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, 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))); - pb->icase = this->flags() & regbase::icase; - 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; - charT name_delim; - int mark_reset = m_mark_reset; - int max_mark = m_max_mark; - m_mark_reset = -1; - m_max_mark = m_mark_count; - int v; - // - // select the actual extension used: - // - switch(this->m_traits.syntax_type(*m_position)) - { - case regex_constants::syntax_or: - m_mark_reset = m_mark_count; - BOOST_FALLTHROUGH; - case regex_constants::syntax_colon: - // - // a non-capturing mark: - // - pb->index = markid = 0; - ++m_position; - break; - case regex_constants::syntax_digit: - { - // - // a recursive subexpression: - // - v = this->m_traits.toi(m_position, m_end, 10); - if((v < 0) || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark)) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base, "The recursive sub-expression refers to an invalid marking group, or is unterminated."); - return false; - } -insert_recursion: - pb->index = markid = 0; - re_recurse* pr = static_cast<re_recurse*>(this->append_state(syntax_element_recurse, sizeof(re_recurse))); - pr->alt.i = v; - pr->state_id = 0; - static_cast<re_case*>( - this->append_state(syntax_element_toggle_case, sizeof(re_case)) - )->icase = this->flags() & regbase::icase; - break; - } - case regex_constants::syntax_plus: - // - // A forward-relative recursive subexpression: - // - ++m_position; - v = this->m_traits.toi(m_position, m_end, 10); - if((v <= 0) || (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark)) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base, "An invalid or unterminated recursive sub-expression."); - return false; - } - v += m_mark_count; - goto insert_recursion; - case regex_constants::syntax_dash: - // - // Possibly a backward-relative recursive subexpression: - // - ++m_position; - v = this->m_traits.toi(m_position, m_end, 10); - if(v <= 0) - { - --m_position; - // Oops not a relative recursion at all, but a (?-imsx) group: - goto option_group_jump; - } - v = m_mark_count + 1 - v; - if(v <= 0) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base, "An invalid or unterminated recursive sub-expression."); - return false; - } - goto insert_recursion; - 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) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, 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 - { - // Probably a named capture which also starts (?< : - name_delim = '>'; - --m_position; - goto named_capture_jump; - } - ++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) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - v = this->m_traits.toi(m_position, m_end, 10); - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - if(*m_position == charT('R')) - { - if(++m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - if(*m_position == charT('&')) - { - const charT* base = ++m_position; - while((m_position != m_end) && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark)) - ++m_position; - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - v = -static_cast<int>(hash_value_from_capture_name(base, m_position)); - } - else - { - v = -this->m_traits.toi(m_position, m_end, 10); - } - re_brace* br = static_cast<re_brace*>(this->append_state(syntax_element_assert_backref, sizeof(re_brace))); - br->index = v < 0 ? (v - 1) : 0; - if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - if(++m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - } - else if((*m_position == charT('\'')) || (*m_position == charT('<'))) - { - const charT* base = ++m_position; - while((m_position != m_end) && (*m_position != charT('>')) && (*m_position != charT('\''))) - ++m_position; - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - v = static_cast<int>(hash_value_from_capture_name(base, m_position)); - re_brace* br = static_cast<re_brace*>(this->append_state(syntax_element_assert_backref, sizeof(re_brace))); - br->index = v; - if(((*m_position != charT('>')) && (*m_position != charT('\''))) || (++m_position == m_end)) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base, "Unterminated named capture."); - return false; - } - if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - if(++m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - } - else if(*m_position == charT('D')) - { - const char* def = "DEFINE"; - while(*def && (m_position != m_end) && (*m_position == charT(*def))) - ++m_position, ++def; - if((m_position == m_end) || *def) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - re_brace* br = static_cast<re_brace*>(this->append_state(syntax_element_assert_backref, sizeof(re_brace))); - br->index = 9999; // special magic value! - if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - if(++m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - } - else 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) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - if(++m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, 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) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - if(++m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, 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) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, 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)) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, 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)) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - m_position -= 2; - } - } - break; - } - case regex_constants::syntax_close_mark: - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - case regex_constants::escape_type_end_buffer: - { - name_delim = *m_position; -named_capture_jump: - markid = 0; - if(0 == (this->flags() & regbase::nosubs)) - { - markid = ++m_mark_count; - #ifndef BOOST_NO_STD_DISTANCE - 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) - 2, 0)); - #else - if(this->flags() & regbase::save_subexpression_location) - this->m_pdata->m_subs.push_back(std::pair<std::size_t, std::size_t>((m_position - m_base) - 2, 0)); - #endif - } - pb->index = markid; - const charT* base = ++m_position; - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - while((m_position != m_end) && (*m_position != name_delim)) - ++m_position; - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - this->m_pdata->set_name(base, m_position, markid); - ++m_position; - break; - } - default: - if(*m_position == charT('R')) - { - ++m_position; - v = 0; - if(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - goto insert_recursion; - } - if(*m_position == charT('&')) - { - ++m_position; - const charT* base = m_position; - while((m_position != m_end) && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark)) - ++m_position; - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - v = static_cast<int>(hash_value_from_capture_name(base, m_position)); - goto insert_recursion; - } - if(*m_position == charT('P')) - { - ++m_position; - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - if(*m_position == charT('>')) - { - ++m_position; - const charT* base = m_position; - while((m_position != m_end) && (this->m_traits.syntax_type(*m_position) != regex_constants::syntax_close_mark)) - ++m_position; - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - return false; - } - v = static_cast<int>(hash_value_from_capture_name(base, m_position)); - goto insert_recursion; - } - } - // - // lets assume that we have a (?imsx) group and try and parse it: - // -option_group_jump: - regex_constants::syntax_option_type opts = parse_options(); - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base); - 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 - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, 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)) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base, "Invalid alternation operators within (?...) block."); - return false; - } - // - // we either have a ')' or we have run out of characters prematurely: - // - if(m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - this->fail(regex_constants::error_paren, ::cutl_details_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) && (markid != -2)) - { - // Oops... we didn't have anything inside the assertion. - // Note we don't get here for negated forward lookahead as (?!) - // does have some uses. - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_perl_extension, m_position - m_base, "Invalid or empty zero width assertion."); - 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) - { - // Can't have seen more than one alternative: - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_bad_pattern, m_position - m_base, "More than one alternation operator | was encountered inside a conditional expression."); - return false; - } - else - { - // We must *not* have seen an alternative inside a (DEFINE) block: - b = this->getaddress(b->next.i, b); - if((b->type == syntax_element_assert_backref) && (static_cast<re_brace*>(b)->index == 9999)) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_bad_pattern, m_position - m_base, "Alternation operators are not allowed inside a DEFINE block."); - 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)) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_badrepeat, m_position - m_base, "A repetition operator cannot be applied to a zero-width assertion."); - return false; - } - } - // - // append closing parenthesis state: - // - pb = static_cast<re_brace*>(this->append_state(syntax_element_endmark, sizeof(re_brace))); - pb->index = markid; - pb->icase = this->flags() & regbase::icase; - 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; - // - // And the mark_reset data: - // - if(m_max_mark > m_mark_count) - { - m_mark_count = m_max_mark; - } - m_mark_reset = mark_reset; - m_max_mark = max_mark; - - - if(markid > 0) - { -#ifndef BOOST_NO_STD_DISTANCE - if(this->flags() & regbase::save_subexpression_location) - this->m_pdata->m_subs.at(markid - 1).second = std::distance(m_base, m_position) - 1; -#else - if(this->flags() & regbase::save_subexpression_location) - this->m_pdata->m_subs.at(markid - 1).second = (m_position - m_base) - 1; -#endif - // - // allow backrefs to this mark: - // - if((markid > 0) && (markid < (int)(sizeof(unsigned) * CHAR_BIT))) - this->m_backrefs |= 1u << (markid - 1); - } - 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) - { - // Rewind to start of sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_escape) --m_position; - 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) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - fail(regex_constants::error_paren, m_position - m_base); - return false; - } - } - while(!breakout); - - breakout = false; - - if(*m_position == static_cast<charT>('-')) - { - if(++m_position == m_end) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - 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) - { - // Rewind to start of (? sequence: - --m_position; - while(this->m_traits.syntax_type(*m_position) != regex_constants::syntax_open_mark) --m_position; - 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, "Can't terminate a sub-expression with an alternation operator |."); - 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 cutl_details_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 |