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/****************************************************************************** |
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* Top contributors (to current version): |
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* Andrew Reynolds, Mathias Preiner, Morgan Deters |
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* |
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* This file is part of the cvc5 project. |
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* |
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* Copyright (c) 2009-2021 by the authors listed in the file AUTHORS |
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* in the top-level source directory and their institutional affiliations. |
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* All rights reserved. See the file COPYING in the top-level source |
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* directory for licensing information. |
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* **************************************************************************** |
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* |
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* Implementation of a class representing a type matcher. |
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*/ |
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#include "type_matcher.h" |
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namespace cvc5 { |
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TypeMatcher::TypeMatcher(TypeNode dt) |
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{ |
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Assert(dt.isDatatype()); |
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addTypesFromDatatype(dt); |
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} |
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void TypeMatcher::addTypesFromDatatype(TypeNode dt) |
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{ |
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std::vector<TypeNode> argTypes = dt.getParamTypes(); |
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addTypes(argTypes); |
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Debug("typecheck-idt") << "instantiating matcher for " << dt << std::endl; |
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for (unsigned i = 0, narg = argTypes.size(); i < narg; ++i) |
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{ |
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if (dt.isParameterInstantiatedDatatype(i)) |
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{ |
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Debug("typecheck-idt") |
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<< "++ instantiate param " << i << " : " << d_types[i] << std::endl; |
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d_match[i] = d_types[i]; |
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} |
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} |
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} |
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void TypeMatcher::addType(TypeNode t) |
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{ |
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d_types.push_back(t); |
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d_match.push_back(TypeNode::null()); |
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} |
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void TypeMatcher::addTypes(const std::vector<TypeNode>& types) |
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{ |
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for (const TypeNode& t : types) |
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{ |
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addType(t); |
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} |
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} |
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bool TypeMatcher::doMatching(TypeNode pattern, TypeNode tn) |
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{ |
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Debug("typecheck-idt") << "doMatching() : " << pattern << " : " << tn |
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<< std::endl; |
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std::vector<TypeNode>::iterator i = |
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std::find(d_types.begin(), d_types.end(), pattern); |
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if (i != d_types.end()) |
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{ |
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size_t index = i - d_types.begin(); |
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if (!d_match[index].isNull()) |
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{ |
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Debug("typecheck-idt") |
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<< "check subtype " << tn << " " << d_match[index] << std::endl; |
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TypeNode tnn = TypeNode::leastCommonTypeNode(tn, d_match[index]); |
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// recognize subtype relation |
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if (!tnn.isNull()) |
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{ |
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d_match[index] = tnn; |
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return true; |
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} |
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return false; |
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} |
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d_match[index] = tn; |
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return true; |
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} |
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else if (pattern == tn) |
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{ |
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return true; |
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} |
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else if (pattern.getKind() != tn.getKind() |
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|| pattern.getNumChildren() != tn.getNumChildren()) |
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{ |
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return false; |
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} |
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else if (pattern.getNumChildren() == 0) |
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{ |
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// fail if the type parameter or type constructors are different |
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return pattern == tn; |
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} |
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for (size_t j = 0, nchild = pattern.getNumChildren(); j < nchild; j++) |
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{ |
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if (!doMatching(pattern[j], tn[j])) |
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{ |
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return false; |
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} |
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} |
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return true; |
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} |
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void TypeMatcher::getTypes(std::vector<TypeNode>& types) const |
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{ |
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types.clear(); |
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for (const TypeNode& t : d_types) |
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{ |
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types.push_back(t); |
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} |
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} |
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void TypeMatcher::getMatches(std::vector<TypeNode>& types) const |
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{ |
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types.clear(); |
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for (size_t i = 0, nmatch = d_match.size(); i < nmatch; i++) |
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{ |
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if (d_match[i].isNull()) |
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{ |
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types.push_back(d_types[i]); |
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} |
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else |
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{ |
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types.push_back(d_match[i]); |
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} |
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} |
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} |
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} // namespace cvc5 |