203 lines
6.9 KiB
C++
203 lines
6.9 KiB
C++
#ifndef __ANTHEM__STATEMENT_VISITOR_H
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#define __ANTHEM__STATEMENT_VISITOR_H
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#include <anthem/AST.h>
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#include <anthem/Body.h>
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#include <anthem/Head.h>
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#include <anthem/Term.h>
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#include <anthem/Utils.h>
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namespace anthem
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{
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// StatementVisitor
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//
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////////////////////////////////////////////////////////////////////////////////////////////////////
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struct StatementVisitor
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{
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std::vector<ast::Formula> visit(const Clingo::AST::Program &program, const Clingo::AST::Statement &statement, Context &context)
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{
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// TODO: refactor
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context.logger.log(output::Priority::Debug, (std::string("[program] ") + program.name).c_str());
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if (!program.parameters.empty())
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throwErrorAtLocation(statement.location, "program parameters currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::Rule &rule, const Clingo::AST::Statement &, Context &context)
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{
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context.reset();
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// Concatenate all head terms
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rule.head.data.accept(HeadLiteralCollectFunctionTermsVisitor(), rule.head, context);
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ast::And antecedent;
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// Compute consequent
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auto consequent = rule.head.data.accept(HeadLiteralTranslateToConsequentVisitor(), rule.head, context);
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if (!consequent)
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{
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context.logger.log(output::Priority::Error, "could not translate formula consequent");
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return {};
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}
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// Generate auxiliary variables replacing the head atom’s arguments
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for (auto i = context.headTerms.cbegin(); i != context.headTerms.cend(); i++)
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{
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const auto &headTerm = **i;
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auto variableName = std::string(AuxiliaryHeadVariablePrefix) + std::to_string(i - context.headTerms.cbegin() + 1);
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auto element = ast::Variable(std::move(variableName), ast::Variable::Type::Reserved);
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auto set = translate(headTerm, context);
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auto in = ast::In(std::move(element), std::move(set));
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antecedent.arguments.emplace_back(std::move(in));
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}
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// Translate body literals
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for (auto i = rule.body.cbegin(); i != rule.body.cend(); i++)
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{
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const auto &bodyLiteral = *i;
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if (bodyLiteral.sign != Clingo::AST::Sign::None)
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throwErrorAtLocation(bodyLiteral.location, "only positive literals currently supported", context);
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auto argument = bodyLiteral.data.accept(BodyBodyLiteralTranslateVisitor(), bodyLiteral, context);
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if (!argument)
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throwErrorAtLocation(bodyLiteral.location, "could not translate body literal", context);
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antecedent.arguments.emplace_back(std::move(argument.value()));
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}
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std::vector<ast::Formula> formulas;
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if (!context.isChoiceRule)
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formulas.emplace_back(ast::Formula::make<ast::Implies>(std::move(antecedent), std::move(consequent.value())));
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else
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{
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const auto createFormula =
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[&](ast::Formula &argument, bool isLastOne)
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{
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auto consequent = std::move(argument);
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if (!isLastOne)
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formulas.emplace_back(ast::Formula::make<ast::Implies>(ast::deepCopy(antecedent), std::move(consequent)));
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else
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formulas.emplace_back(ast::Formula::make<ast::Implies>(std::move(antecedent), std::move(consequent)));
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auto &implies = formulas.back().get<ast::Implies>();
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auto &antecedent = implies.antecedent.get<ast::And>();
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antecedent.arguments.emplace_back(ast::deepCopy(implies.consequent));
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};
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if (consequent.value().is<ast::Or>())
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{
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auto &disjunction = consequent.value().get<ast::Or>();
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for (auto &argument : disjunction.arguments)
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createFormula(argument, &argument == &disjunction.arguments.back());
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}
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// TODO: check whether this is really correct for all possible consequent types
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else
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createFormula(consequent.value(), true);
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}
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for (auto &formula : formulas)
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{
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auto &implies = formula.get<ast::Implies>();
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auto &antecedent = implies.antecedent.get<ast::And>();
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// Use “true” as the consequent in case it is empty
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if (antecedent.arguments.empty())
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implies.antecedent = ast::Formula::make<ast::Boolean>(true);
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else if (antecedent.arguments.size() == 1)
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{
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// TODO: remove workaround
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auto tmp = std::move(antecedent.arguments[0]);
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implies.antecedent = std::move(tmp);
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}
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}
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return formulas;
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}
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std::vector<ast::Formula> visit(const Clingo::AST::Definition &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“definition” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::ShowSignature &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“show signature” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::ShowTerm &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“show term” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::Minimize &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“minimize” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::Script &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“script” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::External &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“external” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::Edge &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“edge” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::Heuristic &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“heuristic” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::ProjectAtom &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“project atom” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::ProjectSignature &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“project signature” statements currently unsupported", context);
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return {};
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}
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std::vector<ast::Formula> visit(const Clingo::AST::TheoryDefinition &, const Clingo::AST::Statement &statement, Context &context)
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{
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throwErrorAtLocation(statement.location, "“theory definition” statements currently unsupported", context);
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return {};
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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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