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// Copyright (C) 2016 Jochen Becher
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0 WITH Qt-GPL-exception-1.0
#pragma once
#include <QString>
#include <QList>
class QStringParser
{
private:
class Parser
{
private:
class Node
{
public:
virtual ~Node() { }
virtual bool accept(Parser &visitor, int *index) = 0;
};
template<typename V>
class RefNode : public Node
{
public:
explicit RefNode(V &v) : m_v(v) { }
bool accept(Parser &visitor, int *index) override { return visitor.visit(this, index); }
V &ref() const { return m_v; }
private:
V &m_v;
};
template<class U, typename V>
class SetterNode : public Node
{
public:
SetterNode(U &u, void (U::*setter)(V)) : m_object(u), m_setter(setter) { }
bool accept(Parser &visitor, int *index) override{ return visitor.visit(this, index); }
U &object() const { return m_object; }
void (U::*setter() const)(V) { return m_setter; }
private:
U &m_object;
void (U::*m_setter)(V) = nullptr;
};
public:
Parser(const QString &source, const QString &pattern);
~Parser();
template<typename V>
Parser &arg(V &v)
{
m_nodes.append(new RefNode<V>(v));
return *this;
}
template<class U, typename V>
Parser &arg(U &u, void (U::*setter)(V))
{
m_nodes.append(new SetterNode<U, V>(u, setter));
return *this;
}
bool failed();
private:
bool scan(int *i, int *index);
bool scan(double *d, int *index);
template<typename V>
bool visit(RefNode<V> *node, int *index)
{
V v = nullptr;
if (!scan(&v, index))
return false;
node->ref() = v;
return true;
}
template<class U, typename V>
bool visit(SetterNode<U, V> *node, int *index)
{
V v = 0;
if (!scan(&v, index))
return false;
(node->object().*(node->setter()))(v);
return true;
}
template<class U, typename V>
bool visit(SetterNode<U, const V &> *node, int *index)
{
V v = 0;
if (!scan(&v, index))
return false;
(node->object().*(node->setter()))(v);
return true;
}
void evaluate();
const QString m_source;
const QString m_pattern;
bool m_isEvaluated = false;
bool m_evaluationFailed = false;
QList<Node *> m_nodes;
};
public:
explicit QStringParser(const QString &source);
~QStringParser();
Parser parse(const QString &pattern);
private:
const QString m_source;
};
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