X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/0f2ecc913ba8f6998a3c77001e20210aca0b9d0a..94e8d77cbb22041c133edaa00720dff0de45a68a:/src/common/regex.cpp diff --git a/src/common/regex.cpp b/src/common/regex.cpp index db11e97cec..b5b1fb49d4 100644 --- a/src/common/regex.cpp +++ b/src/common/regex.cpp @@ -18,10 +18,6 @@ // headers // ---------------------------------------------------------------------------- -#ifdef __GNUG__ - #pragma implementation "regex.h" -#endif - // For compilers that support precompilation, includes "wx.h". #include "wx/wxprec.h" @@ -38,19 +34,33 @@ #include "wx/intl.h" #endif //WX_PRECOMP -// FreeBSD requires this, it probably doesn't hurt for others -#ifdef __UNIX__ - #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" +// defined when the regex lib uses 'char' but 'wxChar' is wide +#if wxUSE_UNICODE && !defined(__REG_NOFRONT) +# define WXREGEX_CONVERT_TO_MB +#endif + // ---------------------------------------------------------------------------- // private classes // ---------------------------------------------------------------------------- +// 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 { @@ -59,19 +69,28 @@ 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, 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() @@ -79,11 +98,19 @@ private: if ( IsValid() ) { regfree(&m_RegEx); - - m_isCompiled = FALSE; } + + delete [] m_Matches; + } + + // free the RE if any and reinit the members + void Reinit() + { + Free(); + Init(); } + // compiled RE regex_t m_RegEx; @@ -91,7 +118,7 @@ private: regmatch_t *m_Matches; size_t m_nMatches; - // TRUE if m_RegEx is valid + // true if m_RegEx is valid bool m_isCompiled; }; @@ -105,51 +132,71 @@ 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); if ( len > 0 ) { - len++; + char* szcmbError = new char[++len]; - (void)regerror(errorcode, &m_RegEx, msg.GetWriteBuf(len), len); + (void)regerror(errorcode, &m_RegEx, szcmbError, len); - msg.UngetWriteBuf(); + szError = wxConvertMB2WX(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 ) @@ -158,13 +205,20 @@ bool wxRegExImpl::Compile(const wxString& expr, int flags) flagsRE |= REG_NEWLINE; // compile it - int errorcode = regcomp(&m_RegEx, expr, flagsRE); +#ifdef __REG_NOFRONT + bool conv = true; + int errorcode = wx_re_comp(&m_RegEx, expr, expr.length(), flagsRE); +#else + 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 { @@ -176,19 +230,46 @@ 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 +bool wxRegExImpl::Matches(const wxRegChar *str, int flags, 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)), @@ -208,54 +289,86 @@ bool wxRegExImpl::Matches(const wxChar *str, int flags) const } // do match it - int rc = regexec(&self->m_RegEx, str, m_nMatches, m_Matches, flagsRE); +#ifdef __REG_NOFRONT + int rc = wx_re_exec(&self->m_RegEx, str, len, NULL, m_nMatches, m_Matches, flagsRE); +#else + int rc = str ? regexec(&self->m_RegEx, str, m_nMatches, m_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") ); + 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") ); const regmatch_t& match = m_Matches[index]; - if ( match.rm_so == -1 ) - return FALSE; + // we need the casts because rm_so can be a 64 bit quantity if ( start ) - *start = match.rm_so; + *start = wx_truncate_cast(size_t, match.rm_so); if ( len ) - *len = match.rm_eo - match.rm_so; + *len = wx_truncate_cast(size_t, match.rm_eo - match.rm_so); + + 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 TRUE; + 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 = wxConvertWX2MB(*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 = @@ -267,10 +380,6 @@ 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 @@ -280,13 +389,15 @@ 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) ) + Matches(textstr + matchStart, + countRepl ? wxRE_NOTBOL : 0, + 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()); @@ -318,26 +429,16 @@ int wxRegExImpl::Replace(wxString *text, size_t start, len; if ( !GetMatch(&start, &len, index) ) { - // we can't do it because GetMatch() returns FALSE - // even for a valid back reference index if it didn't - // match for this expression (e.g. it when alternative - // branches were used and the one contained the back - // ref didn't match) - // - // it would be better to distinguish between this case - // and really invalid index, but I don't know how to - // do it - - //wxFAIL_MSG( _T("invalid back reference") ); + wxFAIL_MSG( _T("invalid back reference") ); // just eat it... } else { - textNew += wxString(text->c_str() + matchStart + start, - len); + textNew += wxString(textstr + matchStart + start, + *wxConvCurrent, len); - mayHaveBackrefs = TRUE; + mayHaveBackrefs = true; } } else // ordinary character @@ -353,17 +454,34 @@ 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 + 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 + matchStart, *wxConvCurrent)); +#endif + *text = result; + return countRepl; } @@ -376,7 +494,6 @@ void wxRegEx::Init() m_impl = NULL; } - wxRegEx::~wxRegEx() { delete m_impl; @@ -395,22 +512,26 @@ 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 { - wxCHECK_MSG( IsValid(), FALSE, _T("must successfully Compile() first") ); + wxCHECK_MSG( IsValid(), false, _T("must successfully Compile() first") ); - return m_impl->Matches(str, flags); +#ifndef WXREGEX_CONVERT_TO_MB + return m_impl->Matches(str, flags, wxStrlen(str)); +#else + return m_impl->Matches(wxConvertWX2MB(str), flags, wxStrlen(str)); +#endif } 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); } @@ -424,11 +545,18 @@ 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); }