1 files changed, 140 insertions, 0 deletions
diff --git a/backend/genesys/value_filter.h b/backend/genesys/value_filter.h
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+++ b/backend/genesys/value_filter.h
@@ -0,0 +1,140 @@
+/* sane - Scanner Access Now Easy.
+
+   Copyright (C) 2020 Povilas Kanapickas <povilas@radix.lt>
+
+   This file is part of the SANE package.
+
+   This program is free software; you can redistribute it and/or
+   modify it under the terms of the GNU General Public License as
+   published by the Free Software Foundation; either version 2 of the
+   License, or (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software
+   Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+   MA 02111-1307, USA.
+*/
+
+#ifndef BACKEND_GENESYS_VALUE_FILTER_H
+#define BACKEND_GENESYS_VALUE_FILTER_H
+
+#include <algorithm>
+#include <initializer_list>
+#include <iostream>
+#include <vector>
+
+namespace genesys {
+
+struct AnyTag {};
+constexpr AnyTag VALUE_FILTER_ANY{};
+
+template<class T>
+class ValueFilterAny
+{
+public:
+    ValueFilterAny() : matches_any_{false} {}
+    ValueFilterAny(AnyTag) : matches_any_{true} {}
+    ValueFilterAny(std::initializer_list<T> values) :
+        matches_any_{false},
+        values_{values}
+    {}
+
+    bool matches(T value) const
+    {
+        if (matches_any_)
+            return true;
+        auto it = std::find(values_.begin(), values_.end(), value);
+        return it != values_.end();
+    }
+
+    bool operator==(const ValueFilterAny& other) const
+    {
+        return matches_any_ == other.matches_any_ && values_ == other.values_;
+    }
+
+    bool matches_any() const { return matches_any_; }
+    const std::vector<T>& values() const { return values_; }
+
+private:
+    bool matches_any_ = false;
+    std::vector<T> values_;
+
+    template<class Stream, class U>
+    friend void serialize(Stream& str, ValueFilterAny<U>& x);
+};
+
+template<class T>
+std::ostream& operator<<(std::ostream& out, const ValueFilterAny<T>& values)
+{
+    if (values.matches_any()) {
+        out << "ANY";
+        return out;
+    }
+    out << format_vector_indent_braced(4, "", values.values());
+    return out;
+}
+
+template<class Stream, class T>
+void serialize(Stream& str, ValueFilterAny<T>& x)
+{
+    serialize(str, x.matches_any_);
+    serialize_newline(str);
+    serialize(str, x.values_);
+}
+
+
+template<class T>
+class ValueFilter
+{
+public:
+    ValueFilter() = default;
+    ValueFilter(std::initializer_list<T> values) :
+        values_{values}
+    {}
+
+    bool matches(T value) const
+    {
+        auto it = std::find(values_.begin(), values_.end(), value);
+        return it != values_.end();
+    }
+
+    bool operator==(const ValueFilter& other) const
+    {
+        return values_ == other.values_;
+    }
+
+    const std::vector<T>& values() const { return values_; }
+
+private:
+    std::vector<T> values_;
+
+    template<class Stream, class U>
+    friend void serialize(Stream& str, ValueFilter<U>& x);
+};
+
+template<class T>
+std::ostream& operator<<(std::ostream& out, const ValueFilter<T>& values)
+{
+    if (values.values().empty()) {
+        out << "(none)";
+        return out;
+    }
+    out << format_vector_indent_braced(4, "", values.values());
+    return out;
+}
+
+template<class Stream, class T>
+void serialize(Stream& str, ValueFilter<T>& x)
+{
+    serialize_newline(str);
+    serialize(str, x.values_);
+}
+
+} // namespace genesys
+
+#endif // BACKEND_GENESYS_VALUE_FILTER_H