Check for and prune non-viable branches in the condition tree

[poefilter.git] / source / condition.h

diff --git a/source/condition.h b/source/condition.h
index 979f1e904714032788a8daf1d850568c713f353e..163c9c828f6d7499f5be57442e8fac5bfbb87486 100644 (file)
--- a/source/condition.h
+++ b/source/condition.h
@@ -21,6 +21,7 @@ public:
        virtual Condition *flatten() const { return clone(); }
        virtual bool can_merge(const Condition &, const CompoundCondition &) const { return false; }
        virtual Condition *merge(const std::vector<Condition *> &, const CompoundCondition &) const { return 0; }
+       virtual bool is_viable() const { return true; }
        virtual void add_lines(std::list<FilterStatement> &) const = 0;
 };
 
@@ -71,6 +72,7 @@ protected:
        virtual Condition *flatten(OrCondition *, AndCondition *) const;
        virtual Condition *flatten(OrCondition *, OrCondition *) const;
 public:
+       virtual bool is_viable() const;
        virtual void add_lines(std::list<FilterStatement> &) const;
 };
 
@@ -87,6 +89,7 @@ protected:
        virtual Condition *flatten(OrCondition *, AndCondition *) const;
        virtual Condition *flatten(OrCondition *, OrCondition *) const;
 public:
+       virtual bool is_viable() const;
        virtual void add_lines(std::list<FilterStatement> &) const;
 };