// class template regex -*- C++ -*-
-// Copyright (C) 2013 Free Software Foundation, Inc.
+// Copyright (C) 2013-2020 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
namespace std _GLIBCXX_VISIBILITY(default)
{
-namespace __detail
-{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
+namespace __detail
+{
/**
* @addtogroup regex-detail
* @{
*/
+ struct _ScannerBase
+ {
+ public:
+ /// Token types returned from the scanner.
+ enum _TokenT : unsigned
+ {
+ _S_token_anychar,
+ _S_token_ord_char,
+ _S_token_oct_num,
+ _S_token_hex_num,
+ _S_token_backref,
+ _S_token_subexpr_begin,
+ _S_token_subexpr_no_group_begin,
+ _S_token_subexpr_lookahead_begin, // neg if _M_value[0] == 'n'
+ _S_token_subexpr_end,
+ _S_token_bracket_begin,
+ _S_token_bracket_neg_begin,
+ _S_token_bracket_end,
+ _S_token_interval_begin,
+ _S_token_interval_end,
+ _S_token_quoted_class,
+ _S_token_char_class_name,
+ _S_token_collsymbol,
+ _S_token_equiv_class_name,
+ _S_token_opt,
+ _S_token_or,
+ _S_token_closure0,
+ _S_token_closure1,
+ _S_token_line_begin,
+ _S_token_line_end,
+ _S_token_word_bound, // neg if _M_value[0] == 'n'
+ _S_token_comma,
+ _S_token_dup_count,
+ _S_token_eof,
+ _S_token_bracket_dash,
+ _S_token_unknown = -1u
+ };
+
+ protected:
+ typedef regex_constants::syntax_option_type _FlagT;
+
+ enum _StateT
+ {
+ _S_state_normal,
+ _S_state_in_brace,
+ _S_state_in_bracket,
+ };
+
+ protected:
+ _ScannerBase(_FlagT __flags)
+ : _M_state(_S_state_normal),
+ _M_flags(__flags),
+ _M_escape_tbl(_M_is_ecma()
+ ? _M_ecma_escape_tbl
+ : _M_awk_escape_tbl),
+ _M_spec_char(_M_is_ecma()
+ ? _M_ecma_spec_char
+ : _M_flags & regex_constants::basic
+ ? _M_basic_spec_char
+ : _M_flags & regex_constants::extended
+ ? _M_extended_spec_char
+ : _M_flags & regex_constants::grep
+ ? ".[\\*^$\n"
+ : _M_flags & regex_constants::egrep
+ ? ".[\\()*+?{|^$\n"
+ : _M_flags & regex_constants::awk
+ ? _M_extended_spec_char
+ : nullptr),
+ _M_at_bracket_start(false)
+ { __glibcxx_assert(_M_spec_char); }
+
+ protected:
+ const char*
+ _M_find_escape(char __c)
+ {
+ auto __it = _M_escape_tbl;
+ for (; __it->first != '\0'; ++__it)
+ if (__it->first == __c)
+ return &__it->second;
+ return nullptr;
+ }
+
+ bool
+ _M_is_ecma() const
+ { return _M_flags & regex_constants::ECMAScript; }
+
+ bool
+ _M_is_basic() const
+ { return _M_flags & (regex_constants::basic | regex_constants::grep); }
+
+ bool
+ _M_is_extended() const
+ {
+ return _M_flags & (regex_constants::extended
+ | regex_constants::egrep
+ | regex_constants::awk);
+ }
+
+ bool
+ _M_is_grep() const
+ { return _M_flags & (regex_constants::grep | regex_constants::egrep); }
+
+ bool
+ _M_is_awk() const
+ { return _M_flags & regex_constants::awk; }
+
+ protected:
+ // TODO: Make them static in the next abi change.
+ const std::pair<char, _TokenT> _M_token_tbl[9] =
+ {
+ {'^', _S_token_line_begin},
+ {'$', _S_token_line_end},
+ {'.', _S_token_anychar},
+ {'*', _S_token_closure0},
+ {'+', _S_token_closure1},
+ {'?', _S_token_opt},
+ {'|', _S_token_or},
+ {'\n', _S_token_or}, // grep and egrep
+ {'\0', _S_token_or},
+ };
+ const std::pair<char, char> _M_ecma_escape_tbl[8] =
+ {
+ {'0', '\0'},
+ {'b', '\b'},
+ {'f', '\f'},
+ {'n', '\n'},
+ {'r', '\r'},
+ {'t', '\t'},
+ {'v', '\v'},
+ {'\0', '\0'},
+ };
+ const std::pair<char, char> _M_awk_escape_tbl[11] =
+ {
+ {'"', '"'},
+ {'/', '/'},
+ {'\\', '\\'},
+ {'a', '\a'},
+ {'b', '\b'},
+ {'f', '\f'},
+ {'n', '\n'},
+ {'r', '\r'},
+ {'t', '\t'},
+ {'v', '\v'},
+ {'\0', '\0'},
+ };
+ const char* _M_ecma_spec_char = "^$\\.*+?()[]{}|";
+ const char* _M_basic_spec_char = ".[\\*^$";
+ const char* _M_extended_spec_char = ".[\\()*+?{|^$";
+
+ _StateT _M_state;
+ _FlagT _M_flags;
+ _TokenT _M_token;
+ const std::pair<char, char>* _M_escape_tbl;
+ const char* _M_spec_char;
+ bool _M_at_bracket_start;
+ };
+
/**
- * @brief struct _Scanner. Scans an input range for regex tokens.
+ * @brief Scans an input range for regex tokens.
*
* The %_Scanner class interprets the regular expression pattern in
* the input range passed to its constructor as a sequence of parse
* constructor: different regular expression grammars will interpret
* the same input pattern in syntactically different ways.
*/
- template<typename _FwdIter>
+ template<typename _CharT>
class _Scanner
+ : public _ScannerBase
{
public:
- typedef typename std::iterator_traits<_FwdIter>::value_type _CharT;
+ typedef const _CharT* _IterT;
typedef std::basic_string<_CharT> _StringT;
typedef regex_constants::syntax_option_type _FlagT;
typedef const std::ctype<_CharT> _CtypeT;
- /// Token types returned from the scanner.
- enum _TokenT
- {
- _S_token_anychar,
- _S_token_ord_char,
- _S_token_oct_num,
- _S_token_hex_num,
- _S_token_backref,
- _S_token_subexpr_begin,
- _S_token_subexpr_no_group_begin,
- _S_token_subexpr_lookahead_begin,
- _S_token_subexpr_end,
- _S_token_bracket_begin,
- _S_token_bracket_neg_begin,
- _S_token_bracket_end,
- _S_token_interval_begin,
- _S_token_interval_end,
- _S_token_quoted_class,
- _S_token_char_class_name,
- _S_token_collsymbol,
- _S_token_equiv_class_name,
- _S_token_opt,
- _S_token_or,
- _S_token_closure0,
- _S_token_closure1,
- _S_token_ungreedy,
- _S_token_line_begin,
- _S_token_line_end,
- _S_token_word_bound,
- _S_token_comma,
- _S_token_dup_count,
- _S_token_eof,
- _S_token_unknown
- };
-
- _Scanner(_FwdIter __begin, _FwdIter __end,
+ _Scanner(_IterT __begin, _IterT __end,
_FlagT __flags, std::locale __loc);
void
#endif
private:
- enum _StateT
- {
- _S_state_normal,
- _S_state_in_brace,
- _S_state_in_bracket,
- };
-
void
_M_scan_normal();
void
_M_eat_class(char);
- constexpr bool
- _M_is_ecma()
- { return _M_flags & regex_constants::ECMAScript; }
-
- constexpr bool
- _M_is_basic()
- { return _M_flags & (regex_constants::basic | regex_constants::grep); }
-
- constexpr bool
- _M_is_extended()
- {
- return _M_flags & (regex_constants::extended
- | regex_constants::egrep
- | regex_constants::awk);
- }
-
- constexpr bool
- _M_is_grep()
- { return _M_flags & (regex_constants::grep | regex_constants::egrep); }
-
- constexpr bool
- _M_is_awk()
- { return _M_flags & regex_constants::awk; }
-
- _StateT _M_state;
- _FwdIter _M_current;
- _FwdIter _M_end;
- _FlagT _M_flags;
+ _IterT _M_current;
+ _IterT _M_end;
_CtypeT& _M_ctype;
- _TokenT _M_token;
_StringT _M_value;
- bool _M_at_bracket_start;
- public:
- // TODO: make them static when this file is stable.
- const std::map<char, _TokenT> _M_token_map;
- const std::map<char, char> _M_ecma_escape_map;
- const std::map<char, char> _M_awk_escape_map;
- const std::set<char> _M_ecma_spec_char;
- const std::set<char> _M_basic_spec_char;
- const std::set<char> _M_extended_spec_char;
-
- const std::map<char, char>& _M_escape_map;
- const std::set<char>& _M_spec_char;
void (_Scanner::* _M_eat_escape)();
};
//@} regex-detail
-_GLIBCXX_END_NAMESPACE_VERSION
} // namespace __detail
+_GLIBCXX_END_NAMESPACE_VERSION
} // namespace std
#include <bits/regex_scanner.tcc>
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