148 lines
3.9 KiB
C++
148 lines
3.9 KiB
C++
/*
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* Strawberry Music Player
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* This file was part of Clementine.
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* Copyright 2012, David Sansome <me@davidsansome.com>
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* Copyright 2018-2024, Jonas Kvinge <jonas@jkvinge.net>
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*
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* Strawberry is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Strawberry is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Strawberry. If not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#ifndef FILTERTREE_H
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#define FILTERTREE_H
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#include "config.h"
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#include <QList>
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#include <QString>
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#include <QStringList>
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#include <QScopedPointer>
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#include "core/song.h"
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#include "filterparsersearchcomparators.h"
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class FilterTree {
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public:
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explicit FilterTree();
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virtual ~FilterTree();
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enum class FilterType {
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Nop = 0,
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Or,
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And,
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Not,
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Column,
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Term
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};
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virtual FilterType type() const = 0;
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virtual bool accept(const Song &song) const = 0;
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protected:
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static QVariant DataFromColumn(const QString &column, const Song &metadata);
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private:
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Q_DISABLE_COPY(FilterTree)
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};
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// Trivial filter that accepts *anything*
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class NopFilter : public FilterTree {
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public:
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FilterType type() const override { return FilterType::Nop; }
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bool accept(const Song &song) const override { Q_UNUSED(song); return true; }
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};
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// Filter that applies a SearchTermComparator to all fields
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class FilterTerm : public FilterTree {
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public:
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explicit FilterTerm(const QStringList &columns, FilterParserSearchTermComparator *comparator) : columns_(columns), cmp_(comparator) {}
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FilterType type() const override { return FilterType::Term; }
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bool accept(const Song &song) const override {
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for (const QString &column : columns_) {
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if (cmp_->Matches(DataFromColumn(column, song))) return true;
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}
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return false;
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}
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private:
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const QStringList columns_;
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QScopedPointer<FilterParserSearchTermComparator> cmp_;
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};
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class FilterColumnTerm : public FilterTree {
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public:
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explicit FilterColumnTerm(const QString &column, FilterParserSearchTermComparator *comparator) : column_(column), cmp_(comparator) {}
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FilterType type() const override { return FilterType::Column; }
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bool accept(const Song &song) const override {
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return cmp_->Matches(DataFromColumn(column_, song));
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}
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private:
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const QString column_;
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QScopedPointer<FilterParserSearchTermComparator> cmp_;
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};
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class NotFilter : public FilterTree {
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public:
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explicit NotFilter(const FilterTree *inv) : child_(inv) {}
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FilterType type() const override { return FilterType::Not; }
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bool accept(const Song &song) const override {
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return !child_->accept(song);
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}
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private:
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QScopedPointer<const FilterTree> child_;
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};
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class OrFilter : public FilterTree {
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public:
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~OrFilter() override { qDeleteAll(children_); }
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FilterType type() const override { return FilterType::Or; }
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virtual void add(FilterTree *child) { children_.append(child); }
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bool accept(const Song &song) const override {
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return std::any_of(children_.begin(), children_.end(), [song](FilterTree *child) { return child->accept(song); });
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}
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private:
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QList<FilterTree*> children_;
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};
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class AndFilter : public FilterTree {
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public:
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~AndFilter() override { qDeleteAll(children_); }
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FilterType type() const override { return FilterType::And; }
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virtual void add(FilterTree *child) { children_.append(child); }
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bool accept(const Song &song) const override {
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return !std::any_of(children_.begin(), children_.end(), [song](FilterTree *child) { return !child->accept(song); });
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}
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private:
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QList<FilterTree*> children_;
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};
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#endif // FILTERTREE_H
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