factor regex package name matches into newly created cachefilter classes

apt-pkg/cachefilter.cc

@@ -0,0 +1,54 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/** \file cachefilter.h
+    Collection of functor classes */
+									/*}}}*/
+// Include Files							/*{{{*/
+#include <apt-pkg/cachefilter.h>
+#include <apt-pkg/error.h>
+#include <apt-pkg/pkgcache.h>
+
+#include <apti18n.h>
+
+#include <string>
+
+#include <regex.h>
+									/*}}}*/
+namespace APT {
+namespace CacheFilter {
+PackageNameMatchesRegEx::PackageNameMatchesRegEx(std::string const &Pattern) {/*{{{*/
+	pattern = new regex_t;
+	int const Res = regcomp(pattern, Pattern.c_str(), REG_EXTENDED | REG_ICASE | REG_NOSUB);
+	if (Res == 0)
+		return;
+
+	delete pattern;
+	pattern = NULL;
+	char Error[300];
+	regerror(Res, pattern, Error, sizeof(Error));
+	_error->Error(_("Regex compilation error - %s"), Error);
+}
+									/*}}}*/
+bool PackageNameMatchesRegEx::operator() (pkgCache::PkgIterator const &Pkg) {/*{{{*/
+	if (unlikely(pattern == NULL))
+		return false;
+	else
+		return regexec(pattern, Pkg.Name(), 0, 0, 0) == 0;
+}
+									/*}}}*/
+bool PackageNameMatchesRegEx::operator() (pkgCache::GrpIterator const &Grp) {/*{{{*/
+	if (unlikely(pattern == NULL))
+		return false;
+	else
+		return regexec(pattern, Grp.Name(), 0, 0, 0) == 0;
+}
+									/*}}}*/
+PackageNameMatchesRegEx::~PackageNameMatchesRegEx() {			/*{{{*/
+	if (pattern == NULL)
+		return;
+	regfree(pattern);
+	delete pattern;
+}
+									/*}}}*/
+}
+}

apt-pkg/cachefilter.h

@@ -0,0 +1,29 @@
+// -*- mode: cpp; mode: fold -*-
+// Description								/*{{{*/
+/** \file cachefilter.h
+   Collection of functor classes */
+									/*}}}*/
+#ifndef APT_CACHEFILTER_H
+#define APT_CACHEFILTER_H
+// Include Files							/*{{{*/
+#include <apt-pkg/pkgcache.h>
+
+#include <string>
+
+#include <regex.h>
+									/*}}}*/
+namespace APT {
+namespace CacheFilter {
+// PackageNameMatchesRegEx						/*{{{*/
+class PackageNameMatchesRegEx {
+	regex_t* pattern;
+public:
+	PackageNameMatchesRegEx(std::string const &Pattern);
+	bool operator() (pkgCache::PkgIterator const &Pkg);
+	bool operator() (pkgCache::GrpIterator const &Grp);
+	~PackageNameMatchesRegEx();
+};
+									/*}}}*/
+}
+}
+#endif

apt-pkg/makefile

@@ -35,14 +35,15 @@ SOURCE+= pkgcache.cc version.cc depcache.cc \
 	 srcrecords.cc cachefile.cc versionmatch.cc policy.cc \
 	 pkgsystem.cc indexfile.cc pkgcachegen.cc acquire-item.cc \
 	 indexrecords.cc vendor.cc vendorlist.cc cdrom.cc indexcopy.cc \
-	 aptconfiguration.cc
+	 aptconfiguration.cc cachefilter.cc
 HEADERS+= algorithms.h depcache.h pkgcachegen.h cacheiterators.h \
 	  orderlist.h sourcelist.h packagemanager.h tagfile.h \
 	  init.h pkgcache.h version.h progress.h pkgrecords.h \
 	  acquire.h acquire-worker.h acquire-item.h acquire-method.h \
 	  clean.h srcrecords.h cachefile.h versionmatch.h policy.h \
 	  pkgsystem.h indexfile.h metaindex.h indexrecords.h vendor.h \
-	  vendorlist.h cdrom.h indexcopy.h aptconfiguration.h
+	  vendorlist.h cdrom.h indexcopy.h aptconfiguration.h \
+	  cachefilter.h
 
 # Source code for the debian specific components
 # In theory the deb headers do not need to be exported..

cmdline/cacheset.cc

@@ -10,6 +10,7 @@
 									/*}}}*/
 // Include Files							/*{{{*/
 #include <apt-pkg/aptconfiguration.h>
+#include <apt-pkg/cachefilter.h>
 #include <apt-pkg/error.h>
 #include <apt-pkg/strutl.h>
 #include <apt-pkg/versionmatch.h>
@@ -97,22 +98,14 @@ PackageSet PackageSet::FromRegEx(pkgCacheFile &Cache, std::string pattern, Cache
 			arch = "native";
 	}
 
-	regex_t Pattern;
-	int Res;
-	if ((Res = regcomp(&Pattern, pattern.c_str() , REG_EXTENDED | REG_ICASE | REG_NOSUB)) != 0) {
-		char Error[300];
-		regerror(Res, &Pattern, Error, sizeof(Error));
-		_error->Error(_("Regex compilation error - %s"), Error);
-		return PackageSet(REGEX);
-	}
-
 	if (unlikely(Cache.GetPkgCache() == 0))
 		return PackageSet(REGEX);
 
+	APT::CacheFilter::PackageNameMatchesRegEx regexfilter(pattern);
+
 	PackageSet pkgset(REGEX);
-	for (pkgCache::GrpIterator Grp = Cache.GetPkgCache()->GrpBegin(); Grp.end() == false; ++Grp)
-	{
-		if (regexec(&Pattern, Grp.Name(), 0, 0, 0) != 0)
+	for (pkgCache::GrpIterator Grp = Cache.GetPkgCache()->GrpBegin(); Grp.end() == false; ++Grp) {
+		if (regexfilter(Grp) == false)
 			continue;
 		pkgCache::PkgIterator Pkg = Grp.FindPkg(arch);
 		if (Pkg.end() == true) {
@@ -128,7 +121,6 @@ PackageSet PackageSet::FromRegEx(pkgCacheFile &Cache, std::string pattern, Cache
 
 		pkgset.insert(Pkg);
 	}
-	regfree(&Pattern);
 
 	if (pkgset.empty() == true)
 		return helper.canNotFindRegEx(Cache, pattern);