http://www.ousob.com --- Legacy Redefined OuSob - File: /wwwroot/clipx/usr/include/wvstreams/wvregex.h

/* -*- Mode: C++ -*- * Worldvisions Weaver Software: * Copyright (C) 1997-2004 Net Integration Technologies, Inc. * * Regular expression support though libc */ #ifndef __WVREGEX_H #define __WVREGEX_H #include "wverror.h" #include "wvstring.h" #include <sys/types.h> #include <regex.h> #define __WVRE_REG(n) __wvre_r##n #define __WVRE_DECL_FORM(n) WvString &__WVRE_REG(n) = WvRegex::__wvre_null_reg #define WVREGEX_REGS_DECL \ __WVRE_DECL_FORM( 0), __WVRE_DECL_FORM( 1), \ __WVRE_DECL_FORM( 2), __WVRE_DECL_FORM( 3), \ __WVRE_DECL_FORM( 4), __WVRE_DECL_FORM( 5), \ __WVRE_DECL_FORM( 6), __WVRE_DECL_FORM( 7), \ __WVRE_DECL_FORM( 8), __WVRE_DECL_FORM( 9), \ __WVRE_DECL_FORM(10), __WVRE_DECL_FORM(11), \ __WVRE_DECL_FORM(12), __WVRE_DECL_FORM(13), \ __WVRE_DECL_FORM(14), __WVRE_DECL_FORM(15), \ __WVRE_DECL_FORM(16), __WVRE_DECL_FORM(17), \ __WVRE_DECL_FORM(18), __WVRE_DECL_FORM(19) #define __WVRE_CALL_FORM(n) __WVRE_REG(n) #define WVREGEX_REGS_CALL \ __WVRE_CALL_FORM( 0), __WVRE_CALL_FORM( 1), \ __WVRE_CALL_FORM( 2), __WVRE_CALL_FORM( 3), \ __WVRE_CALL_FORM( 4), __WVRE_CALL_FORM( 5), \ __WVRE_CALL_FORM( 6), __WVRE_CALL_FORM( 7), \ __WVRE_CALL_FORM( 8), __WVRE_CALL_FORM( 9), \ __WVRE_CALL_FORM(10), __WVRE_CALL_FORM(11), \ __WVRE_CALL_FORM(12), __WVRE_CALL_FORM(13), \ __WVRE_CALL_FORM(14), __WVRE_CALL_FORM(15), \ __WVRE_CALL_FORM(16), __WVRE_CALL_FORM(17), \ __WVRE_CALL_FORM(18), __WVRE_CALL_FORM(19) /*! @brief WvRegex -- Unified support for regular expressions. Supports matching compiled regular expressions and capturing substrings in registers. !*/ class WvRegex: public WvErrorBase { private: bool have_preg; regex_t preg; bool match(WvStringParm string, int eflags, size_t nmatch, regmatch_t pmatch[]) const; virtual void seterr(int _errnum); bool _match(WvStringParm string, int eflags, int &match_start, int &match_end, WVREGEX_REGS_DECL) const { regmatch_t pmatch[21]; int nmatch = 1; #define __WVRE_COUNT_REGS(n) \ if ( &__WVRE_REG(n) != &__wvre_null_reg) ++nmatch __WVRE_COUNT_REGS( 0); __WVRE_COUNT_REGS( 1); __WVRE_COUNT_REGS( 2); __WVRE_COUNT_REGS( 3); __WVRE_COUNT_REGS( 4); __WVRE_COUNT_REGS( 5); __WVRE_COUNT_REGS( 6); __WVRE_COUNT_REGS( 7); __WVRE_COUNT_REGS( 8); __WVRE_COUNT_REGS( 9); __WVRE_COUNT_REGS(10); __WVRE_COUNT_REGS(11); __WVRE_COUNT_REGS(12); __WVRE_COUNT_REGS(13); __WVRE_COUNT_REGS(14); __WVRE_COUNT_REGS(15); __WVRE_COUNT_REGS(16); __WVRE_COUNT_REGS(17); __WVRE_COUNT_REGS(18); __WVRE_COUNT_REGS(19); if (!match(string, eflags, nmatch, pmatch)) return false; match_start = pmatch[0].rm_so; match_end = pmatch[0].rm_eo; #define __WVRE_STORE_REGS(n) \ if (&__WVRE_REG(n) != &__wvre_null_reg \ && pmatch[n+1].rm_so != -1 && pmatch[n+1].rm_eo != -1) \ { \ int len = pmatch[n+1].rm_eo-pmatch[n+1].rm_so; \ __WVRE_REG(n).setsize(len+1); \ memcpy(__WVRE_REG(n).edit(), &string[pmatch[n+1].rm_so], len); \ __WVRE_REG(n).edit()[len] = '\0'; \ } __WVRE_STORE_REGS( 0); __WVRE_STORE_REGS( 1); __WVRE_STORE_REGS( 2); __WVRE_STORE_REGS( 3); __WVRE_STORE_REGS( 4); __WVRE_STORE_REGS( 5); __WVRE_STORE_REGS( 6); __WVRE_STORE_REGS( 7); __WVRE_STORE_REGS( 8); __WVRE_STORE_REGS( 9); __WVRE_STORE_REGS(10); __WVRE_STORE_REGS(11); __WVRE_STORE_REGS(12); __WVRE_STORE_REGS(13); __WVRE_STORE_REGS(14); __WVRE_STORE_REGS(15); __WVRE_STORE_REGS(16); __WVRE_STORE_REGS(17); __WVRE_STORE_REGS(18); __WVRE_STORE_REGS(19); return true; } public: //! //! Flags that affect interpretation of the regex; used in Regex() and //! set() //! enum CFlags { // Use (obsolete) basic regex syntax (like grep). See regex(7). BASIC = 0, // Use extended regex syntax (like egrep). See regex(7). EXTENDED = REG_EXTENDED, // Case insensitive ICASE = REG_ICASE, // Do not collect match start and end or registers; faster NOSUB = REG_NOSUB, // Match-any-character operators don't match a newline. See regex(3) NEWLINE = REG_NEWLINE }; static const int default_cflags; //! //! Flags that affect matching of regex. Used in match() and //! continuable_match() //! enum EFlags { // Matching begining of line always fails (unless NEWLINE cflag is set) NOTBOL = REG_NOTBOL, // Matching end of line always fails (unless NEWLINE cflag is set) NOTEOL = REG_NOTEOL }; static const int default_eflags; //! //! Internal use only //! static WvString __wvre_null_reg; //! //! Construct an empty regex object. Matches will always fail until set() //! is called with a valid regex. //! WvRegex() : have_preg(false) {} //! //! Construct a regex object, compiling the given regex //! //! \param regex The new regular expression to match //! \param cflags CFlags used to compile the regular expression; //! the defaults are case sensitive, extended RE. //! WvRegex(WvStringParm regex, int cflags = default_cflags) : have_preg(false) { set(regex, cflags); } ~WvRegex(); //! //! Replace the current regex to match with a new one. //! //! \param regex The new regular expression to match //! \param cflags CFlags used to compile the regular expression; //! the defaults are case sensitive, extended RE. //! bool set(WvStringParm regex, int cflags = default_cflags); //! //! Match a given string against the compiled regular expression //! //! \param string The string to match //! \param (remaining) WvString registers to capture substring matches //! as specified in the RE //! //! \code //! extern WvString line; //! WvString match; //! if (re.match(line, match)) //! wvout->print("Matching substring is '%s'\n", match); //! \endcode //! bool match(WvStringParm string, WVREGEX_REGS_DECL) const { int match_start, match_end; return _match(string, default_eflags, match_start, match_end, WVREGEX_REGS_CALL); } //! //! Match a given string against the compiled regular expression //! //! \param string The string to match //! \param eflags EFlags that affect matching //! \param (remaining) WvString registers to capture substring matches //! as specified in the RE //! bool match(WvStringParm string, int eflags, WVREGEX_REGS_DECL) const { int match_start, match_end; return _match(string, eflags, match_start, match_end, WVREGEX_REGS_CALL); } //! //! Match a given string against the compiled regular expression, //! capturing the start and end positions of the matching string. //! //! \param string The string to match //! \param match_start If the match succeeds, the starting index of the //! match in string //! \param match_end If the match succeeds, the index of the character in //! string following the last character of the match //! \param (remaining) WvString registers to capture substring matches //! as specified in the RE //! //! \code //! extern WvString line; //! int start = 0; //! WvString match; //! int match_start, match_end; //! while (re.continuable_match(&line[start], //! match_start, match_end, match)) //! { //! wvout->print("Matching substring is '%s'@[%s,%s)\n", //! match, match_start, match_end); //! start += match_end; //! } //! \endcode //! bool continuable_match(WvStringParm string, int &match_start, int &match_end, WVREGEX_REGS_DECL) const { return _match(string, default_eflags, match_start, match_end, WVREGEX_REGS_CALL); } //! //! Match a given string against the compiled regular expression, //! capturing the start and end positions of the matching string. //! //! \param string The string to match //! \param eflags EFlags that affect matching //! \param match_start If the match succeeds, the starting index of the //! match in string //! \param match_end If the match succeeds, the index of the character in //! string following the last character of the match //! \param (remaining) WvString registers to capture substring matches //! as specified in the RE //! bool continuable_match(WvStringParm string, int eflags, int &match_start, int &match_end, WVREGEX_REGS_DECL) const { return _match(string, eflags, match_start, match_end, WVREGEX_REGS_CALL); } }; #endif // __WVREGEX_H