X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/765624f7350bf32b1c78a10ab1a1e10729c52cd1..a899707131e8b94a628c44309517128707ef6b57:/src/common/regex.cpp diff --git a/src/common/regex.cpp b/src/common/regex.cpp index 46eb372cfb..7879616899 100644 --- a/src/common/regex.cpp +++ b/src/common/regex.cpp @@ -1,11 +1,11 @@ /////////////////////////////////////////////////////////////////////////////// // Name: src/common/regex.cpp // Purpose: regular expression matching -// Author: Karsten Ballüder and Vadim Zeitlin +// Author: Karsten Ballueder and Vadim Zeitlin // Modified by: // Created: 13.07.01 // RCS-ID: $Id$ -// Copyright: (c) 2000 Karsten Ballüder +// Copyright: (c) 2000 Karsten Ballueder // 2001 Vadim Zeitlin // Licence: wxWindows licence /////////////////////////////////////////////////////////////////////////////// @@ -18,10 +18,6 @@ // headers // ---------------------------------------------------------------------------- -#ifdef __GNUG__ - #pragma implementation "regex.h" -#endif - // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -36,16 +32,125 @@ #include "wx/string.h" #include "wx/log.h" #include "wx/intl.h" + #include "wx/crt.h" #endif //WX_PRECOMP -#include +// FreeBSD, Watcom and DMars require this, CW doesn't have nor need it. +// Others also don't seem to need it. If you have an error related to +// (not) including please report details to +// wx-dev@lists.wxwindows.org +#if defined(__UNIX__) || defined(__WATCOMC__) || defined(__DIGITALMARS__) +# include +#endif +#include #include "wx/regex.h" +// WXREGEX_USING_BUILTIN defined when using the built-in regex lib +// WXREGEX_USING_RE_SEARCH defined when using re_search in the GNU regex lib +// WXREGEX_IF_NEED_LEN() wrap the len parameter only used with the built-in +// or GNU regex +// WXREGEX_CONVERT_TO_MB defined when the regex lib is using chars and +// wxChar is wide, so conversion must be done +// WXREGEX_CHAR(x) Convert wxChar to wxRegChar +// +#ifdef __REG_NOFRONT +# define WXREGEX_USING_BUILTIN +# define WXREGEX_IF_NEED_LEN(x) ,x +# if wxUSE_UNICODE +# define WXREGEX_CHAR(x) (x).wc_str() +# else +# define WXREGEX_CHAR(x) (x).mb_str() +# endif +#else +# ifdef HAVE_RE_SEARCH +# define WXREGEX_IF_NEED_LEN(x) ,x +# define WXREGEX_USING_RE_SEARCH +# else +# define WXREGEX_IF_NEED_LEN(x) +# endif +# if wxUSE_UNICODE +# define WXREGEX_CONVERT_TO_MB +# endif +# define WXREGEX_CHAR(x) (x).mb_str() +# define wx_regfree regfree +# define wx_regerror regerror +#endif + // ---------------------------------------------------------------------------- // private classes // ---------------------------------------------------------------------------- +#ifndef WXREGEX_USING_RE_SEARCH + +// the array of offsets for the matches, the usual POSIX regmatch_t array. +class wxRegExMatches +{ +public: + typedef regmatch_t *match_type; + + wxRegExMatches(size_t n) { m_matches = new regmatch_t[n]; } + ~wxRegExMatches() { delete [] m_matches; } + + // we just use casts here because the fields of regmatch_t struct may be 64 + // bit but we're limited to size_t in our public API and are not going to + // change it because operating on strings longer than 4GB using it is + // absolutely impractical anyhow + size_t Start(size_t n) const + { + return wx_truncate_cast(size_t, m_matches[n].rm_so); + } + + size_t End(size_t n) const + { + return wx_truncate_cast(size_t, m_matches[n].rm_eo); + } + + regmatch_t *get() const { return m_matches; } + +private: + regmatch_t *m_matches; +}; + +#else // WXREGEX_USING_RE_SEARCH + +// the array of offsets for the matches, the struct used by the GNU lib +class wxRegExMatches +{ +public: + typedef re_registers *match_type; + + wxRegExMatches(size_t n) + { + m_matches.num_regs = n; + m_matches.start = new regoff_t[n]; + m_matches.end = new regoff_t[n]; + } + + ~wxRegExMatches() + { + delete [] m_matches.start; + delete [] m_matches.end; + } + + size_t Start(size_t n) const { return m_matches.start[n]; } + size_t End(size_t n) const { return m_matches.end[n]; } + + re_registers *get() { return &m_matches; } + +private: + re_registers m_matches; +}; + +#endif // WXREGEX_USING_RE_SEARCH + +// the character type used by the regular expression engine +#ifndef WXREGEX_CONVERT_TO_MB +typedef wxChar wxRegChar; +#else +typedef char wxRegChar; +#endif + // the real implementation of wxRegEx class wxRegExImpl { @@ -54,42 +159,60 @@ public: wxRegExImpl(); ~wxRegExImpl(); - // return TRUE if Compile() had been called successfully + // return true if Compile() had been called successfully bool IsValid() const { return m_isCompiled; } // RE operations bool Compile(const wxString& expr, int flags = 0); - bool Matches(const wxChar *str, int flags = 0) const; + bool Matches(const wxRegChar *str, int flags + WXREGEX_IF_NEED_LEN(size_t len)) const; bool GetMatch(size_t *start, size_t *len, size_t index = 0) const; + size_t GetMatchCount() const; int Replace(wxString *pattern, const wxString& replacement, size_t maxMatches = 0) const; private: // return the string containing the error message for the given err code - wxString GetErrorMsg(int errorcode) const; + wxString GetErrorMsg(int errorcode, bool badconv) const; + + // init the members + void Init() + { + m_isCompiled = false; + m_Matches = NULL; + m_nMatches = 0; + } // free the RE if compiled void Free() { if ( IsValid() ) { - regfree(&m_RegEx); - - m_isCompiled = FALSE; + wx_regfree(&m_RegEx); } + + delete m_Matches; + } + + // free the RE if any and reinit the members + void Reinit() + { + Free(); + Init(); } // compiled RE - regex_t m_RegEx; + regex_t m_RegEx; // the subexpressions data - regmatch_t *m_Matches; - size_t m_nMatches; + wxRegExMatches *m_Matches; + size_t m_nMatches; - // TRUE if m_RegEx is valid - bool m_isCompiled; + // true if m_RegEx is valid + bool m_isCompiled; }; + // ============================================================================ // implementation // ============================================================================ @@ -100,51 +223,71 @@ private: wxRegExImpl::wxRegExImpl() { - m_isCompiled = FALSE; - m_Matches = NULL; + Init(); } wxRegExImpl::~wxRegExImpl() { Free(); - - delete [] m_Matches; } -wxString wxRegExImpl::GetErrorMsg(int errorcode) const +wxString wxRegExImpl::GetErrorMsg(int errorcode, bool badconv) const { - wxString msg; +#ifdef WXREGEX_CONVERT_TO_MB + // currently only needed when using system library in Unicode mode + if ( badconv ) + { + return _("conversion to 8-bit encoding failed"); + } +#else + // 'use' badconv to avoid a compiler warning + (void)badconv; +#endif + + wxString szError; // first get the string length needed - int len = regerror(errorcode, &m_RegEx, NULL, 0); + int len = wx_regerror(errorcode, &m_RegEx, NULL, 0); if ( len > 0 ) { - len++; + char* szcmbError = new char[++len]; - (void)regerror(errorcode, &m_RegEx, msg.GetWriteBuf(len), len); + (void)wx_regerror(errorcode, &m_RegEx, szcmbError, len); - msg.UngetWriteBuf(); + szError = wxConvLibc.cMB2WX(szcmbError); + delete [] szcmbError; } else // regerror() returned 0 { - msg = _("unknown error"); + szError = _("unknown error"); } - return msg; + return szError; } bool wxRegExImpl::Compile(const wxString& expr, int flags) { - Free(); - - // translate our flags to regcomp() ones - wxASSERT_MSG( !(flags & - ~(wxRE_BASIC | wxRE_ICASE | wxRE_NOSUB | wxRE_NEWLINE)), + Reinit(); + +#ifdef WX_NO_REGEX_ADVANCED +# define FLAVORS wxRE_BASIC +#else +# define FLAVORS (wxRE_ADVANCED | wxRE_BASIC) + wxASSERT_MSG( (flags & FLAVORS) != FLAVORS, + _T("incompatible flags in wxRegEx::Compile") ); +#endif + wxASSERT_MSG( !(flags & ~(FLAVORS | wxRE_ICASE | wxRE_NOSUB | wxRE_NEWLINE)), _T("unrecognized flags in wxRegEx::Compile") ); + // translate our flags to regcomp() ones int flagsRE = 0; if ( !(flags & wxRE_BASIC) ) - flagsRE |= REG_EXTENDED; +#ifndef WX_NO_REGEX_ADVANCED + if (flags & wxRE_ADVANCED) + flagsRE |= REG_ADVANCED; + else +#endif + flagsRE |= REG_EXTENDED; if ( flags & wxRE_ICASE ) flagsRE |= REG_ICASE; if ( flags & wxRE_NOSUB ) @@ -153,13 +296,23 @@ bool wxRegExImpl::Compile(const wxString& expr, int flags) flagsRE |= REG_NEWLINE; // compile it - int errorcode = regcomp(&m_RegEx, expr, flagsRE); +#ifdef WXREGEX_USING_BUILTIN + bool conv = true; + // FIXME-UTF8: use wc_str() after removing ANSI build + int errorcode = wx_re_comp(&m_RegEx, expr.c_str(), expr.length(), flagsRE); +#else + // FIXME-UTF8: this is potentially broken, we shouldn't even try it + // and should always use builtin regex library (or PCRE?) + const wxWX2MBbuf conv = expr.mbc_str(); + int errorcode = conv ? regcomp(&m_RegEx, conv, flagsRE) : REG_BADPAT; +#endif + if ( errorcode ) { wxLogError(_("Invalid regular expression '%s': %s"), - expr.c_str(), GetErrorMsg(errorcode).c_str()); + expr.c_str(), GetErrorMsg(errorcode, !conv).c_str()); - m_isCompiled = FALSE; + m_isCompiled = false; } else // ok { @@ -171,19 +324,75 @@ bool wxRegExImpl::Compile(const wxString& expr, int flags) } else { - // will alloc later - m_nMatches = WX_REGEX_MAXMATCHES; + // we will alloc the array later (only if really needed) but count + // the number of sub-expressions in the regex right now + + // there is always one for the whole expression + m_nMatches = 1; + + // and some more for bracketed subexperessions + for ( const wxChar *cptr = expr.c_str(); *cptr; cptr++ ) + { + if ( *cptr == _T('\\') ) + { + // in basic RE syntax groups are inside \(...\) + if ( *++cptr == _T('(') && (flags & wxRE_BASIC) ) + { + m_nMatches++; + } + } + else if ( *cptr == _T('(') && !(flags & wxRE_BASIC) ) + { + // we know that the previous character is not an unquoted + // backslash because it would have been eaten above, so we + // have a bare '(' and this indicates a group start for the + // extended syntax. '(?' is used for extensions by perl- + // like REs (e.g. advanced), and is not valid for POSIX + // extended, so ignore them always. + if ( cptr[1] != _T('?') ) + m_nMatches++; + } + } } - m_isCompiled = TRUE; + m_isCompiled = true; } return IsValid(); } -bool wxRegExImpl::Matches(const wxChar *str, int flags) const +#ifdef WXREGEX_USING_RE_SEARCH + +// On GNU, regexec is implemented as a wrapper around re_search. re_search +// requires a length parameter which the POSIX regexec does not have, +// therefore regexec must do a strlen on the search text each time it is +// called. This can drastically affect performance when matching is done in +// a loop along a string, such as during a search and replace. Therefore if +// re_search is detected by configure, it is used directly. +// +static int ReSearch(const regex_t *preg, + const char *text, + size_t len, + re_registers *matches, + int eflags) +{ + regex_t *pattern = wx_const_cast(regex_t*, preg); + + pattern->not_bol = (eflags & REG_NOTBOL) != 0; + pattern->not_eol = (eflags & REG_NOTEOL) != 0; + pattern->regs_allocated = REGS_FIXED; + + int ret = re_search(pattern, text, len, 0, len, matches); + return ret >= 0 ? 0 : REG_NOMATCH; +} + +#endif // WXREGEX_USING_RE_SEARCH + +bool wxRegExImpl::Matches(const wxRegChar *str, + int flags + WXREGEX_IF_NEED_LEN(size_t len)) const { - wxCHECK_MSG( IsValid(), FALSE, _T("must successfully Compile() first") ); + wxCHECK_MSG( IsValid(), false, _T("must successfully Compile() first") ); // translate our flags to regexec() ones wxASSERT_MSG( !(flags & ~(wxRE_NOTBOL | wxRE_NOTEOL)), @@ -199,58 +408,91 @@ bool wxRegExImpl::Matches(const wxChar *str, int flags) const wxRegExImpl *self = wxConstCast(this, wxRegExImpl); if ( !m_Matches && m_nMatches ) { - self->m_Matches = new regmatch_t[m_nMatches]; + self->m_Matches = new wxRegExMatches(m_nMatches); } + wxRegExMatches::match_type matches = m_Matches ? m_Matches->get() : NULL; + // do match it - int rc = regexec(&self->m_RegEx, str, m_nMatches, m_Matches, flagsRE); +#if defined WXREGEX_USING_BUILTIN + int rc = wx_re_exec(&self->m_RegEx, str, len, NULL, m_nMatches, matches, flagsRE); +#elif defined WXREGEX_USING_RE_SEARCH + int rc = str ? ReSearch(&self->m_RegEx, str, len, matches, flagsRE) : REG_BADPAT; +#else + int rc = str ? regexec(&self->m_RegEx, str, m_nMatches, matches, flagsRE) : REG_BADPAT; +#endif switch ( rc ) { case 0: // matched successfully - return TRUE; + return true; default: - // an error occured - wxLogError(_("Failed to match '%s' in regular expression: %s"), - str, GetErrorMsg(rc).c_str()); + // an error occurred + wxLogError(_("Failed to find match for regular expression: %s"), + GetErrorMsg(rc, !str).c_str()); // fall through case REG_NOMATCH: // no match - return FALSE; + return false; } } bool wxRegExImpl::GetMatch(size_t *start, size_t *len, size_t index) const { - wxCHECK_MSG( IsValid(), FALSE, _T("must successfully Compile() first") ); - wxCHECK_MSG( m_Matches, FALSE, _T("can't use with wxRE_NOSUB") ); - wxCHECK_MSG( index < m_nMatches, FALSE, _T("invalid match index") ); - - const regmatch_t& match = m_Matches[index]; - if ( match.rm_so == -1 ) - return FALSE; + wxCHECK_MSG( IsValid(), false, _T("must successfully Compile() first") ); + wxCHECK_MSG( m_nMatches, false, _T("can't use with wxRE_NOSUB") ); + wxCHECK_MSG( m_Matches, false, _T("must call Matches() first") ); + wxCHECK_MSG( index < m_nMatches, false, _T("invalid match index") ); if ( start ) - *start = match.rm_so; + *start = m_Matches->Start(index); if ( len ) - *len = match.rm_eo - match.rm_so; + *len = m_Matches->End(index) - m_Matches->Start(index); - return TRUE; + return true; +} + +size_t wxRegExImpl::GetMatchCount() const +{ + wxCHECK_MSG( IsValid(), 0, _T("must successfully Compile() first") ); + wxCHECK_MSG( m_nMatches, 0, _T("can't use with wxRE_NOSUB") ); + + return m_nMatches; } int wxRegExImpl::Replace(wxString *text, const wxString& replacement, size_t maxMatches) const { - wxCHECK_MSG( text, -1, _T("NULL text in wxRegEx::Replace") ); - wxCHECK_MSG( IsValid(), -1, _T("must successfully Compile() first") ); + wxCHECK_MSG( text, wxNOT_FOUND, _T("NULL text in wxRegEx::Replace") ); + wxCHECK_MSG( IsValid(), wxNOT_FOUND, _T("must successfully Compile() first") ); + + // the input string +#ifndef WXREGEX_CONVERT_TO_MB + const wxChar *textstr = text->c_str(); + size_t textlen = text->length(); +#else + const wxWX2MBbuf textstr = WXREGEX_CHAR(*text); + if (!textstr) + { + wxLogError(_("Failed to find match for regular expression: %s"), + GetErrorMsg(0, true).c_str()); + return 0; + } + size_t textlen = strlen(textstr); + text->clear(); +#endif // the replacement text wxString textNew; + // the result, allow 25% extra + wxString result; + result.reserve(5 * textlen / 4); + // attempt at optimization: don't iterate over the string if it doesn't // contain back references at all bool mayHaveBackrefs = @@ -262,10 +504,6 @@ int wxRegExImpl::Replace(wxString *text, } // the position where we start looking for the match - // - // NB: initial version had a nasty bug because it used a wxChar* instead of - // an index but the problem is that replace() in the loop invalidates - // all pointers into the string so we have to use indices instead size_t matchStart = 0; // number of replacement made: we won't make more than maxMatches of them @@ -275,13 +513,19 @@ int wxRegExImpl::Replace(wxString *text, // note that "^" shouldn't match after the first call to Matches() so we // use wxRE_NOTBOL to prevent it from happening while ( (!maxMatches || countRepl < maxMatches) && - Matches(text->c_str() + matchStart, countRepl ? wxRE_NOTBOL : 0) ) +#ifndef WXREGEX_CONVERT_TO_MB + Matches(textstr + matchStart, +#else + Matches(textstr.data() + matchStart, +#endif + countRepl ? wxRE_NOTBOL : 0 + WXREGEX_IF_NEED_LEN(textlen - matchStart)) ) { // the string possibly contains back references: we need to calculate // the replacement text anew after each match if ( mayHaveBackrefs ) { - mayHaveBackrefs = FALSE; + mayHaveBackrefs = false; textNew.clear(); textNew.reserve(replacement.length()); @@ -319,10 +563,15 @@ int wxRegExImpl::Replace(wxString *text, } else { - textNew += wxString(text->c_str() + matchStart + start, - len); +#ifndef WXREGEX_CONVERT_TO_MB + textNew += wxString(textstr + matchStart + start, +#else + textNew += wxString(textstr.data() + matchStart + + start, +#endif + *wxConvCurrent, len); - mayHaveBackrefs = TRUE; + mayHaveBackrefs = true; } } else // ordinary character @@ -338,17 +587,35 @@ int wxRegExImpl::Replace(wxString *text, // we did have match as Matches() returned true above! wxFAIL_MSG( _T("internal logic error in wxRegEx::Replace") ); - return -1; + return wxNOT_FOUND; } + // an insurance against implementations that don't grow exponentially + // to ensure building the result takes linear time + if (result.capacity() < result.length() + start + textNew.length()) + result.reserve(2 * result.length()); + +#ifndef WXREGEX_CONVERT_TO_MB + result.append(*text, matchStart, start); +#else + result.append(wxString(textstr.data() + matchStart, *wxConvCurrent, + start)); +#endif matchStart += start; - text->replace(matchStart, len, textNew); + result.append(textNew); countRepl++; - matchStart += textNew.length(); + matchStart += len; } +#ifndef WXREGEX_CONVERT_TO_MB + result.append(*text, matchStart, wxString::npos); +#else + result.append(wxString(textstr.data() + matchStart, *wxConvCurrent)); +#endif + *text = result; + return countRepl; } @@ -361,7 +628,6 @@ void wxRegEx::Init() m_impl = NULL; } - wxRegEx::~wxRegEx() { delete m_impl; @@ -380,22 +646,23 @@ bool wxRegEx::Compile(const wxString& expr, int flags) delete m_impl; m_impl = NULL; - return FALSE; + return false; } - return TRUE; + return true; } -bool wxRegEx::Matches(const wxChar *str, int flags) const +bool wxRegEx::Matches(const wxString& str, int flags) const { - wxCHECK_MSG( IsValid(), FALSE, _T("must successfully Compile() first") ); + wxCHECK_MSG( IsValid(), false, _T("must successfully Compile() first") ); - return m_impl->Matches(str, flags); + return m_impl->Matches(WXREGEX_CHAR(str), flags + WXREGEX_IF_NEED_LEN(str.length())); } bool wxRegEx::GetMatch(size_t *start, size_t *len, size_t index) const { - wxCHECK_MSG( IsValid(), FALSE, _T("must successfully Compile() first") ); + wxCHECK_MSG( IsValid(), false, _T("must successfully Compile() first") ); return m_impl->GetMatch(start, len, index); } @@ -409,11 +676,18 @@ wxString wxRegEx::GetMatch(const wxString& text, size_t index) const return text.Mid(start, len); } +size_t wxRegEx::GetMatchCount() const +{ + wxCHECK_MSG( IsValid(), 0, _T("must successfully Compile() first") ); + + return m_impl->GetMatchCount(); +} + int wxRegEx::Replace(wxString *pattern, const wxString& replacement, size_t maxMatches) const { - wxCHECK_MSG( IsValid(), -1, _T("must successfully Compile() first") ); + wxCHECK_MSG( IsValid(), wxNOT_FOUND, _T("must successfully Compile() first") ); return m_impl->Replace(pattern, replacement, maxMatches); }