113 lines
2.6 KiB
C++
113 lines
2.6 KiB
C++
#ifndef __PLASP__PDDL__EXPRESSIONS__AT_H
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#define __PLASP__PDDL__EXPRESSIONS__AT_H
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#include <plasp/pddl/Context.h>
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#include <plasp/pddl/Expression.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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// At
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//
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////////////////////////////////////////////////////////////////////////////////////////////////////
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class At: public ExpressionCRTP<At>
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{
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public:
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static const Expression::Type ExpressionType = Expression::Type::At;
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template<typename ExpressionParser>
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static AtPointer parse(Context &context, ExpressionContext &expressionContext,
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ExpressionParser parseExpression);
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static const size_t TimePointStart = std::numeric_limits<size_t>::max();
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static const size_t TimePointEnd = std::numeric_limits<size_t>::max() - 1;
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public:
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At();
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ExpressionPointer copy() override;
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size_t timePoint() const;
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void setArgument(ExpressionPointer argument);
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ExpressionPointer argument() const;
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ExpressionPointer reduced() override;
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ExpressionPointer existentiallyQuantified() override;
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ExpressionPointer simplified() override;
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void collectParameters(std::set<VariablePointer> ¶meters) override;
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void print(std::ostream &ostream) const override;
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protected:
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size_t m_timePoint;
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ExpressionPointer m_argument;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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template<typename ExpressionParser>
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AtPointer At::parse(Context &context, ExpressionContext &expressionContext,
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ExpressionParser parseExpression)
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{
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auto &tokenizer = context.tokenizer;
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const auto position = tokenizer.position();
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if (!tokenizer.testAndSkip<std::string>("(")
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|| !tokenizer.testIdentifierAndSkip("at"))
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{
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tokenizer.seek(position);
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return nullptr;
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}
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size_t timePoint;
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const auto timePointPosition = tokenizer.position();
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if (tokenizer.testIdentifierAndSkip("start"))
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timePoint = TimePointStart;
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else if (tokenizer.testIdentifierAndSkip("end"))
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timePoint = TimePointEnd;
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else if (tokenizer.probeNumber())
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{
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tokenizer.seek(timePointPosition);
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timePoint = tokenizer.get<size_t>();
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}
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else
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{
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tokenizer.seek(position);
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return nullptr;
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}
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auto expression = AtPointer(new At);
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expression->m_timePoint = timePoint;
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tokenizer.skipWhiteSpace();
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// Parse argument
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expression->setArgument(parseExpression(context, expressionContext));
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tokenizer.expect<std::string>(")");
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return expression;
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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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