323 lines
12 KiB
C++
323 lines
12 KiB
C++
#ifndef __ANTHEM__HEAD_H
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#define __ANTHEM__HEAD_H
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#include <algorithm>
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#include <anthem/AST.h>
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#include <anthem/Utils.h>
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#include <anthem/output/Formatting.h>
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namespace anthem
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{
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// Head
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//
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////////////////////////////////////////////////////////////////////////////////////////////////////
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struct TermCollectFunctionTermsVisitor
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{
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void visit(const Clingo::Symbol &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“symbol” terms not allowed, function expected", context);
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}
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void visit(const Clingo::AST::Variable &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“variable” terms currently unsupported, function expected", context);
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}
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void visit(const Clingo::AST::UnaryOperation &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“unary operation” terms currently unsupported, function expected", context);
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}
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void visit(const Clingo::AST::BinaryOperation &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“binary operation” terms currently unsupported, function expected", context);
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}
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void visit(const Clingo::AST::Interval &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“interval” terms currently unsupported, function expected", context);
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}
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void visit(const Clingo::AST::Function &function, const Clingo::AST::Term &term, Context &context)
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{
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if (function.external)
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throwErrorAtLocation(term.location, "external functions currently unsupported", context);
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context.headTerms.reserve(context.headTerms.size() + function.arguments.size());
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for (const auto &argument : function.arguments)
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context.headTerms.emplace_back(&argument);
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}
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void visit(const Clingo::AST::Pool &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“pool” terms currently unsupported, function expected", context);
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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struct LiteralCollectFunctionTermsVisitor
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{
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void visit(const Clingo::AST::Boolean &, const Clingo::AST::Literal &, Context &)
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{
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}
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void visit(const Clingo::AST::Term &term, const Clingo::AST::Literal &, Context &context)
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{
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term.data.accept(TermCollectFunctionTermsVisitor(), term, context);
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}
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void visit(const Clingo::AST::Comparison &, const Clingo::AST::Literal &literal, Context &context)
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{
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throwErrorAtLocation(literal.location, "only disjunctions of literals allowed as head literals", context);
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}
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void visit(const Clingo::AST::CSPLiteral &, const Clingo::AST::Literal &literal, Context &context)
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{
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throwErrorAtLocation(literal.location, "only disjunctions of literals allowed as head literals", context);
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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// TODO: rename, because not only terms are collected anymore
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struct HeadLiteralCollectFunctionTermsVisitor
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{
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void visit(const Clingo::AST::Literal &literal, const Clingo::AST::HeadLiteral &, Context &context)
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{
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context.numberOfHeadLiterals = 1;
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literal.data.accept(LiteralCollectFunctionTermsVisitor(), literal, context);
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}
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void visit(const Clingo::AST::Disjunction &disjunction, const Clingo::AST::HeadLiteral &headLiteral, Context &context)
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{
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context.numberOfHeadLiterals = disjunction.elements.size();
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for (const auto &conditionalLiteral : disjunction.elements)
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{
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if (!conditionalLiteral.condition.empty())
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throwErrorAtLocation(headLiteral.location, "conditional head literals currently unsupported", context);
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conditionalLiteral.literal.data.accept(LiteralCollectFunctionTermsVisitor(), conditionalLiteral.literal, context);
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}
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}
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void visit(const Clingo::AST::Aggregate &aggregate, const Clingo::AST::HeadLiteral &headLiteral, Context &context)
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{
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context.isChoiceRule = true;
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context.numberOfHeadLiterals = aggregate.elements.size();
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if (aggregate.left_guard || aggregate.right_guard)
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throwErrorAtLocation(headLiteral.location, "aggregates with left or right guards not allowed", context);
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for (const auto &conditionalLiteral : aggregate.elements)
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{
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if (!conditionalLiteral.condition.empty())
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throwErrorAtLocation(headLiteral.location, "conditional literals in aggregates currently unsupported", context);
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conditionalLiteral.literal.data.accept(LiteralCollectFunctionTermsVisitor(), conditionalLiteral.literal, context);
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}
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}
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void visit(const Clingo::AST::HeadAggregate &, const Clingo::AST::HeadLiteral &headLiteral, Context &context)
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{
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throwErrorAtLocation(headLiteral.location, "“head aggregate” head literals currently unsupported", context);
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}
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void visit(const Clingo::AST::TheoryAtom &, const Clingo::AST::HeadLiteral &headLiteral, Context &context)
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{
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throwErrorAtLocation(headLiteral.location, "“theory” head literals currently unsupported", context);
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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struct FunctionTermTranslateVisitor
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{
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std::experimental::optional<ast::Formula> visit(const Clingo::Symbol &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“symbol” terms not allowed, function expected", context);
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return std::experimental::nullopt;
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Variable &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“variable” terms currently unsupported, function expected", context);
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return std::experimental::nullopt;
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::UnaryOperation &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“unary operation” terms currently unsupported, function expected", context);
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return std::experimental::nullopt;
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::BinaryOperation &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“binary operation” terms currently unsupported, function expected", context);
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return std::experimental::nullopt;
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Interval &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“interval” terms currently unsupported, function expected", context);
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return std::experimental::nullopt;
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}
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// TODO: check correctness
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Function &function, const Clingo::AST::Term &term, Context &context)
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{
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if (function.external)
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throwErrorAtLocation(term.location, "external functions currently unsupported", context);
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std::vector<ast::Term> arguments;
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arguments.reserve(function.arguments.size());
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for (auto i = function.arguments.cbegin(); i != function.arguments.cend(); i++)
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{
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const auto &argument = *i;
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const auto matchingTerm = std::find(context.headTerms.cbegin(), context.headTerms.cend(), &argument);
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assert(matchingTerm != context.headTerms.cend());
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auto variableName = std::string(AuxiliaryHeadVariablePrefix) + std::to_string(matchingTerm - context.headTerms.cbegin() + 1);
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arguments.emplace_back(ast::Variable(std::move(variableName), ast::Variable::Type::Reserved));
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}
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return ast::Formula::make<ast::Predicate>(function.name, std::move(arguments));
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Pool &, const Clingo::AST::Term &term, Context &context)
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{
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throwErrorAtLocation(term.location, "“pool” terms currently unsupported, function expected", context);
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return std::experimental::nullopt;
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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struct LiteralTranslateVisitor
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{
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Boolean &boolean, const Clingo::AST::Literal &, Context &)
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{
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return ast::Formula::make<ast::Boolean>(boolean.value);
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Term &term, const Clingo::AST::Literal &, Context &context)
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{
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return term.data.accept(FunctionTermTranslateVisitor(), term, context);
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Comparison &, const Clingo::AST::Literal &literal, Context &context)
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{
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throwErrorAtLocation(literal.location, "only disjunctions of literals allowed as head literals", context);
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return std::experimental::nullopt;
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::CSPLiteral &, const Clingo::AST::Literal &literal, Context &context)
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{
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throwErrorAtLocation(literal.location, "only disjunctions of literals allowed as head literals", context);
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return std::experimental::nullopt;
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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struct HeadLiteralTranslateToConsequentVisitor
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{
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Literal &literal, const Clingo::AST::HeadLiteral &, Context &context)
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{
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if (literal.sign == Clingo::AST::Sign::DoubleNegation)
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throwErrorAtLocation(literal.location, "double-negated head literals currently unsupported", context);
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auto translatedLiteral = literal.data.accept(LiteralTranslateVisitor(), literal, context);
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if (literal.sign == Clingo::AST::Sign::None)
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return translatedLiteral;
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if (!translatedLiteral)
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return std::experimental::nullopt;
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return ast::Formula::make<ast::Not>(std::move(translatedLiteral.value()));
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Disjunction &disjunction, const Clingo::AST::HeadLiteral &headLiteral, Context &context)
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{
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std::vector<ast::Formula> arguments;
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arguments.reserve(disjunction.elements.size());
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for (const auto &conditionalLiteral : disjunction.elements)
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{
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if (!conditionalLiteral.condition.empty())
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throwErrorAtLocation(headLiteral.location, "conditional head literals currently unsupported", context);
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auto argument = visit(conditionalLiteral.literal, headLiteral, context);
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if (!argument)
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throwErrorAtLocation(headLiteral.location, "could not parse argument", context);
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arguments.emplace_back(std::move(argument.value()));
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}
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return ast::Formula::make<ast::Or>(std::move(arguments));
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::Aggregate &aggregate, const Clingo::AST::HeadLiteral &headLiteral, Context &context)
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{
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if (aggregate.left_guard || aggregate.right_guard)
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throwErrorAtLocation(headLiteral.location, "aggregates with left or right guards not allowed", context);
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const auto translateConditionalLiteral =
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[&](const auto &conditionalLiteral)
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{
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if (!conditionalLiteral.condition.empty())
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throwErrorAtLocation(headLiteral.location, "conditional head literals currently unsupported", context);
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return this->visit(conditionalLiteral.literal, headLiteral, context);
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};
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if (aggregate.elements.size() == 1)
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return translateConditionalLiteral(aggregate.elements[0]);
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std::vector<ast::Formula> arguments;
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arguments.reserve(aggregate.elements.size());
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for (const auto &conditionalLiteral : aggregate.elements)
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{
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auto argument = translateConditionalLiteral(conditionalLiteral);
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if (!argument)
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throwErrorAtLocation(headLiteral.location, "could not parse argument", context);
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arguments.emplace_back(std::move(argument.value()));
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}
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return ast::Formula::make<ast::Or>(std::move(arguments));
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::HeadAggregate &, const Clingo::AST::HeadLiteral &headLiteral, Context &context)
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{
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throwErrorAtLocation(headLiteral.location, "“head aggregate” head literals currently unsupported", context);
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return std::experimental::nullopt;
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}
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std::experimental::optional<ast::Formula> visit(const Clingo::AST::TheoryAtom &, const Clingo::AST::HeadLiteral &headLiteral, Context &context)
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{
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throwErrorAtLocation(headLiteral.location, "“theory” head literals currently unsupported", context);
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return std::experimental::nullopt;
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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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