add an API for cache filters/matcher

A lot of code deals with iterating over packages and checking for
specific states. At the moment these are all handcrafted inplace, but
that makes sharing common code which just differs in the states it
checks rather difficult and is error prune. Having an API to construct
arbitrary complex filters will come in handy for those.

Git-Dch: Ignore

1 files changed, 90 insertions, 27 deletions

diff --git a/apt-pkg/cachefilter.h b/apt-pkg/cachefilter.h
index d9b957c67..b4697b773 100644
--- a/apt-pkg/cachefilter.h
+++ b/apt-pkg/cachefilter.h
@@ -10,28 +10,90 @@
 #include <apt-pkg/cacheiterators.h>
 
 #include <string>
+#include <vector>
 
 #include <regex.h>
+
+class pkgCacheFile;
 									/*}}}*/
 namespace APT {
 namespace CacheFilter {
 
-class PackageMatcher {
- public:
-   virtual bool operator() (pkgCache::PkgIterator const &/*Pkg*/) { 
-      return false; };
-   virtual bool operator() (pkgCache::GrpIterator const &/*Grp*/) { 
-      return false; };
-   virtual bool operator() (pkgCache::VerIterator const &/*Ver*/) {
-      return false; };
-   
-   virtual ~PackageMatcher() {};
+class Matcher {
+public:
+   virtual bool operator() (pkgCache::PkgIterator const &/*Pkg*/) = 0;
+   virtual bool operator() (pkgCache::GrpIterator const &/*Grp*/) = 0;
+   virtual bool operator() (pkgCache::VerIterator const &/*Ver*/) = 0;
+   virtual ~Matcher();
 };
 
-// PackageNameMatchesRegEx						/*{{{*/
-class PackageNameMatchesRegEx : public PackageMatcher {
-         /** \brief dpointer placeholder (for later in case we need it) */
-         void *d;
+class PackageMatcher : public Matcher {
+public:
+   virtual bool operator() (pkgCache::PkgIterator const &Pkg) = 0;
+   virtual bool operator() (pkgCache::VerIterator const &Ver) { return (*this)(Ver.ParentPkg()); }
+   virtual bool operator() (pkgCache::GrpIterator const &/*Grp*/) { return false; }
+   virtual ~PackageMatcher();
+};
+
+// Generica like True, False, NOT, AND, OR				/*{{{*/
+class TrueMatcher : public Matcher {
+public:
+   virtual bool operator() (pkgCache::PkgIterator const &Pkg);
+   virtual bool operator() (pkgCache::GrpIterator const &Grp);
+   virtual bool operator() (pkgCache::VerIterator const &Ver);
+};
+
+class FalseMatcher : public Matcher {
+public:
+   virtual bool operator() (pkgCache::PkgIterator const &Pkg);
+   virtual bool operator() (pkgCache::GrpIterator const &Grp);
+   virtual bool operator() (pkgCache::VerIterator const &Ver);
+};
+
+class NOTMatcher : public Matcher {
+   Matcher * const matcher;
+public:
+   NOTMatcher(Matcher * const matcher);
+   virtual bool operator() (pkgCache::PkgIterator const &Pkg);
+   virtual bool operator() (pkgCache::GrpIterator const &Grp);
+   virtual bool operator() (pkgCache::VerIterator const &Ver);
+   virtual ~NOTMatcher();
+};
+
+class ANDMatcher : public Matcher {
+   std::vector<Matcher *> matchers;
+public:
+   // 5 ought to be enough for everybody… c++11 variadic templates would be nice
+   ANDMatcher();
+   ANDMatcher(Matcher * const matcher1);
+   ANDMatcher(Matcher * const matcher1, Matcher * const matcher2);
+   ANDMatcher(Matcher * const matcher1, Matcher * const matcher2, Matcher * const matcher3);
+   ANDMatcher(Matcher * const matcher1, Matcher * const matcher2, Matcher * const matcher3, Matcher * const matcher4);
+   ANDMatcher(Matcher * const matcher1, Matcher * const matcher2, Matcher * const matcher3, Matcher * const matcher4, Matcher * const matcher5);
+   ANDMatcher& AND(Matcher * const matcher);
+   virtual bool operator() (pkgCache::PkgIterator const &Pkg);
+   virtual bool operator() (pkgCache::GrpIterator const &Grp);
+   virtual bool operator() (pkgCache::VerIterator const &Ver);
+   virtual ~ANDMatcher();
+};
+class ORMatcher : public Matcher {
+   std::vector<Matcher *> matchers;
+public:
+   // 5 ought to be enough for everybody… c++11 variadic templates would be nice
+   ORMatcher();
+   ORMatcher(Matcher * const matcher1);
+   ORMatcher(Matcher * const matcher1, Matcher * const matcher2);
+   ORMatcher(Matcher * const matcher1, Matcher * const matcher2, Matcher * const matcher3);
+   ORMatcher(Matcher * const matcher1, Matcher * const matcher2, Matcher * const matcher3, Matcher * const matcher4);
+   ORMatcher(Matcher * const matcher1, Matcher * const matcher2, Matcher * const matcher3, Matcher * const matcher4, Matcher * const matcher5);
+   ORMatcher& OR(Matcher * const matcher);
+   virtual bool operator() (pkgCache::PkgIterator const &Pkg);
+   virtual bool operator() (pkgCache::GrpIterator const &Grp);
+   virtual bool operator() (pkgCache::VerIterator const &Ver);
+   virtual ~ORMatcher();
+};
+									/*}}}*/
+class PackageNameMatchesRegEx : public PackageMatcher {			/*{{{*/
 	regex_t* pattern;
 public:
 	PackageNameMatchesRegEx(std::string const &Pattern);
@@ -40,20 +102,16 @@ public:
 	virtual ~PackageNameMatchesRegEx();
 };
 									/*}}}*/
-// PackageNameMatchesFnmatch						/*{{{*/
-   class PackageNameMatchesFnmatch : public PackageMatcher{
-         /** \brief dpointer placeholder (for later in case we need it) */
-         void *d;
-         const std::string Pattern;
+class PackageNameMatchesFnmatch : public PackageMatcher {		/*{{{*/
+	const std::string Pattern;
 public:
-         PackageNameMatchesFnmatch(std::string const &Pattern) 
-            : Pattern(Pattern) {};
-        virtual bool operator() (pkgCache::PkgIterator const &Pkg);
+	PackageNameMatchesFnmatch(std::string const &Pattern);
+	virtual bool operator() (pkgCache::PkgIterator const &Pkg);
 	virtual bool operator() (pkgCache::GrpIterator const &Grp);
 	virtual ~PackageNameMatchesFnmatch() {};
 };
 									/*}}}*/
-// PackageArchitectureMatchesSpecification				/*{{{*/
+class PackageArchitectureMatchesSpecification : public PackageMatcher {	/*{{{*/
 /** \class PackageArchitectureMatchesSpecification
    \brief matching against architecture specification strings
 
@@ -62,12 +120,9 @@ public:
    debian-policy §11.1 "Architecture specification strings".
 
    Examples: i386, mipsel, linux-any, any-amd64, any */
-class PackageArchitectureMatchesSpecification : public PackageMatcher {
 	std::string literal;
 	std::string complete;
 	bool isPattern;
-	/** \brief dpointer placeholder (for later in case we need it) */
-	void *d;
 public:
 	/** \brief matching against architecture specification strings
 	 *
@@ -79,10 +134,18 @@ public:
 	PackageArchitectureMatchesSpecification(std::string const &pattern, bool const isPattern = true);
 	bool operator() (char const * const &arch);
 	virtual bool operator() (pkgCache::PkgIterator const &Pkg);
-	virtual bool operator() (pkgCache::VerIterator const &Ver);
 	virtual ~PackageArchitectureMatchesSpecification();
 };
 									/*}}}*/
+class PackageIsNewInstall : public PackageMatcher {			/*{{{*/
+	pkgCacheFile * const Cache;
+public:
+	PackageIsNewInstall(pkgCacheFile * const Cache);
+	virtual bool operator() (pkgCache::PkgIterator const &Pkg);
+	virtual ~PackageIsNewInstall();
+};
+									/*}}}*/
+
 }
 }
 #endif