Finished implementing completion (unit tests to follow).
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41
include/anthem/ASTUtils.h
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41
include/anthem/ASTUtils.h
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#ifndef __ANTHEM__AST_UTILS_H
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#define __ANTHEM__AST_UTILS_H
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#include <anthem/AST.h>
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namespace anthem
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{
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namespace ast
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{
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// AST Utils
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//
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////////////////////////////////////////////////////////////////////////////////////////////////////
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class VariableStack
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{
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public:
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using Layer = const std::vector<ast::Variable> *;
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public:
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void push(Layer layer);
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void pop();
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bool contains(const ast::Variable &variable) const;
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private:
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std::vector<Layer> m_layers;
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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std::vector<ast::Variable> collectFreeVariables(const ast::Formula &formula, ast::VariableStack &variableStack);
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////////////////////////////////////////////////////////////////////////////////////////////////////
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}
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}
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#endif
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190
src/anthem/ASTUtils.cpp
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src/anthem/ASTUtils.cpp
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#include <anthem/ASTUtils.h>
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#include <anthem/ASTVisitors.h>
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namespace anthem
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{
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namespace ast
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{
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////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// AST Utils
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//
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////////////////////////////////////////////////////////////////////////////////////////////////////
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void VariableStack::push(Layer layer)
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{
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m_layers.push_back(layer);
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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void VariableStack::pop()
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{
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m_layers.pop_back();
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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bool VariableStack::contains(const ast::Variable &variable) const
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{
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const auto variableMatches =
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[&variable](const auto &otherVariable)
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{
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return variable.name == otherVariable.name;
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};
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const auto layerContainsVariable =
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[&variable, &variableMatches](const auto &layer)
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{
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return (std::find_if(layer->cbegin(), layer->cend(), variableMatches) != layer->cend());
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};
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return (std::find_if(m_layers.cbegin(), m_layers.cend(), layerContainsVariable) != m_layers.cend());
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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struct CollectFreeVariablesVisitor
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{
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////////////////////////////////////////////////////////////////////////////////////////////////
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// Formulas
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////////////////////////////////////////////////////////////////////////////////////////////////
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void visit(const ast::And &and_, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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for (const auto &argument : and_.arguments)
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argument.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::Biconditional &biconditional, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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biconditional.left.accept(*this, variableStack, freeVariables);
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biconditional.right.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::Boolean &, VariableStack &, std::vector<ast::Variable> &)
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{
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}
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void visit(const ast::Comparison &comparison, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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comparison.left.accept(*this, variableStack, freeVariables);
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comparison.right.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::Exists &exists, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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variableStack.push(&exists.variables);
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exists.argument.accept(*this, variableStack, freeVariables);
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variableStack.pop();
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}
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void visit(const ast::ForAll &forAll, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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variableStack.push(&forAll.variables);
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forAll.argument.accept(*this, variableStack, freeVariables);
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variableStack.pop();
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}
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void visit(const ast::Implies &implies, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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implies.antecedent.accept(*this, variableStack, freeVariables);
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implies.consequent.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::In &in, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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in.element.accept(*this, variableStack, freeVariables);
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in.set.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::Not ¬_, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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not_.argument.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::Or &or_, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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for (const auto &argument : or_.arguments)
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argument.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::Predicate &predicate, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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for (const auto &argument : predicate.arguments)
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argument.accept(*this, variableStack, freeVariables);
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}
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////////////////////////////////////////////////////////////////////////////////////////////////
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// Terms
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////////////////////////////////////////////////////////////////////////////////////////////////
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void visit(const ast::BinaryOperation &binaryOperation, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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binaryOperation.left.accept(*this, variableStack, freeVariables);
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binaryOperation.right.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::Constant &, VariableStack &, std::vector<ast::Variable> &)
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{
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}
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void visit(const ast::Function &function, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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for (const auto &argument : function.arguments)
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argument.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::Integer &, VariableStack &, std::vector<ast::Variable> &)
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{
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}
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void visit(const ast::Interval &interval, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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interval.from.accept(*this, variableStack, freeVariables);
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interval.to.accept(*this, variableStack, freeVariables);
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}
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void visit(const ast::SpecialInteger &, VariableStack &, std::vector<ast::Variable> &)
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{
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}
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void visit(const ast::String &, VariableStack &, std::vector<ast::Variable> &)
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{
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}
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void visit(const ast::Variable &variable, VariableStack &variableStack, std::vector<ast::Variable> &freeVariables)
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{
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if (variableStack.contains(variable))
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return;
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const auto &variableMatches =
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[&variable](auto &otherVariable)
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{
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return variable.name == otherVariable.name;
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};
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if (std::find_if(freeVariables.cbegin(), freeVariables.cend(), variableMatches) != freeVariables.cend())
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return;
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freeVariables.emplace_back(ast::deepCopy(variable));
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}
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};
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////////////////////////////////////////////////////////////////////////////////////////////////////
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std::vector<ast::Variable> collectFreeVariables(const ast::Formula &formula, ast::VariableStack &variableStack)
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{
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std::vector<ast::Variable> freeVariables;
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formula.accept(CollectFreeVariablesVisitor(), variableStack, freeVariables);
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return freeVariables;
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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}
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}
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@ -1,5 +1,6 @@
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#include <anthem/Completion.h>
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#include <anthem/ASTUtils.h>
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#include <anthem/ASTVisitors.h>
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namespace anthem
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@ -41,6 +42,16 @@ void completePredicate(const ast::Predicate &predicate, std::vector<ast::Formula
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checkMatchingPredicates(predicate.arguments[i], otherPredicate.arguments[i]);
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}
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// Copy the predicate’s arguments for the completed formula
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std::vector<ast::Variable> variables;
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variables.reserve(predicate.arguments.size());
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for (const auto &argument : predicate.arguments)
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{
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assert(argument.is<ast::Variable>());
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variables.emplace_back(ast::deepCopy(argument.get<ast::Variable>()));
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}
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auto or_ = ast::Formula::make<ast::Or>();
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// Build the conjunction of all formulas with the predicate as consequent
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@ -58,11 +69,18 @@ void completePredicate(const ast::Predicate &predicate, std::vector<ast::Formula
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continue;
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}
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// TODO: implement variable lists
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std::vector<ast::Variable> variables = {ast::Variable("dummy", ast::Variable::Type::UserDefined)};
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auto exists = ast::Formula::make<ast::Exists>(std::move(variables), std::move(implies.antecedent));
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ast::VariableStack variableStack;
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variableStack.push(&variables);
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or_.get<ast::Or>().arguments.emplace_back(exists);
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auto variables = ast::collectFreeVariables(implies.antecedent, variableStack);
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if (variables.empty())
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or_.get<ast::Or>().arguments.emplace_back(std::move(implies.antecedent));
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else
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{
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auto exists = ast::Formula::make<ast::Exists>(std::move(variables), std::move(implies.antecedent));
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or_.get<ast::Or>().arguments.emplace_back(std::move(exists));
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}
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if (i > formulasBegin)
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formulas.erase(formulas.begin() + i);
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@ -70,6 +88,9 @@ void completePredicate(const ast::Predicate &predicate, std::vector<ast::Formula
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i++;
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}
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if (or_.get<ast::Or>().arguments.size() == 1)
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or_ = or_.get<ast::Or>().arguments.front();
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// Build the biconditional within the completed formula
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auto biconditional = ast::Formula::make<ast::Biconditional>(ast::deepCopy(predicate), std::move(or_));
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@ -79,16 +100,6 @@ void completePredicate(const ast::Predicate &predicate, std::vector<ast::Formula
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return;
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}
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// Copy the predicate’s arguments for the completed formula
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std::vector<ast::Variable> variables;
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variables.reserve(predicate.arguments.size());
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for (const auto &argument : predicate.arguments)
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{
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assert(argument.is<ast::Variable>());
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variables.emplace_back(ast::deepCopy(argument.get<ast::Variable>()));
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}
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auto completedFormula = ast::Formula::make<ast::ForAll>(std::move(variables), std::move(biconditional));
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formulas[formulasBegin] = std::move(completedFormula);
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@ -56,18 +56,15 @@ void translate(const char *fileName, std::istream &stream, Context &context)
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Clingo::parse_program(fileContent.c_str(), translateStatement, logger);
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if (context.simplify)
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for (auto &formula : formulas)
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simplify(formula);
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if (context.complete)
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complete(formulas);
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for (auto i = formulas.begin(); i != formulas.end(); i++)
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{
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auto &formula = *i;
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if (context.simplify)
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simplify(formula);
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for (const auto &formula : formulas)
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context.logger.outputStream() << formula << std::endl;
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}
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}
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////////////////////////////////////////////////////////////////////////////////////////////////////
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