113 lines
3.0 KiB
C++
113 lines
3.0 KiB
C++
#ifndef __PLASP__PDDL__EXPRESSIONS__BINARY_H
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#define __PLASP__PDDL__EXPRESSIONS__BINARY_H
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#include <plasp/pddl/ConsistencyException.h>
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#include <plasp/pddl/Context.h>
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#include <plasp/pddl/Expression.h>
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#include <plasp/pddl/Identifier.h>
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#include <plasp/pddl/expressions/Variable.h>
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namespace plasp
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{
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namespace pddl
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{
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namespace expressions
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{
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// Binary
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//
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////////////////////////////////////////////////////////////////////////////////////////////////////
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template<class Derived>
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class Binary: public ExpressionCRTP<Derived>
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{
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public:
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template<typename ExpressionParser>
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static std::unique_ptr<Derived> parse(Context &context,
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ExpressionContext &expressionContext, ExpressionParser parseExpression);
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public:
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const std::array<const Expression *, 2> &arguments() const;
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private:
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template<size_t i>
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void setArgument(const Expression *argument);
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template<size_t i>
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void setArgument(ExpressionPointer &&argument);
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std::array<const Expression *, 2> m_arguments;
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std::array<ExpressionPointer, 2> m_argumentStorage;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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template<class Derived>
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template<typename ExpressionParser>
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std::unique_ptr<Derived> Binary<Derived>::parse(Context &context,
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ExpressionContext &expressionContext, ExpressionParser parseExpression)
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{
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auto &parser = context.parser;
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const auto position = parser.position();
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if (!parser.probe<std::string>("(")
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|| !parser.probeIdentifier(Derived::Identifier, isIdentifier))
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{
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parser.seek(position);
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return nullptr;
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}
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auto expression = std::make_unique<Derived>();
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// Assume that expression identifier (imply, exists, etc.) is already parsed
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// Parse arguments of the expression
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expression->Binary<Derived>::setArgument<0>(parseExpression(context, expressionContext));
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expression->Binary<Derived>::setArgument<1>(parseExpression(context, expressionContext));
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parser.expect<std::string>(")");
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return expression;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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template<class Derived>
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template<size_t i>
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void Binary<Derived>::setArgument(const Expression *expression)
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{
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static_assert(i <= 2, "Index out of range");
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m_argumentStorage[i] = nullptr;
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m_arguments[i] = expression;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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template<class Derived>
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template<size_t i>
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void Binary<Derived>::setArgument(ExpressionPointer &&expression)
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{
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static_assert(i <= 2, "Index out of range");
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m_argumentStorage[i] = std::move(expression);
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m_arguments[i] = m_argumentStorage[i].get();
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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template<class Derived>
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const std::array<const Expression *, 2> &Binary<Derived>::arguments() const
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{
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return m_arguments;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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}
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}
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}
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#endif
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