mirror of
https://github.com/vcmi/vcmi.git
synced 2024-11-28 08:48:48 +02:00
632 lines
18 KiB
C++
632 lines
18 KiB
C++
/*
|
|
* LogicalExpression.h, part of VCMI engine
|
|
*
|
|
* Authors: listed in file AUTHORS in main folder
|
|
*
|
|
* License: GNU General Public License v2.0 or later
|
|
* Full text of license available in license.txt file, in main folder
|
|
*
|
|
*/
|
|
#pragma once
|
|
|
|
//FIXME: move some of code into .cpp to avoid this include?
|
|
#include "JsonNode.h"
|
|
|
|
VCMI_LIB_NAMESPACE_BEGIN
|
|
|
|
namespace LogicalExpressionDetail
|
|
{
|
|
/// class that defines required types for logical expressions
|
|
template<typename ContainedClass>
|
|
class ExpressionBase
|
|
{
|
|
public:
|
|
/// Possible logical operations, mostly needed to create different types for boost::variant
|
|
enum EOperations
|
|
{
|
|
ANY_OF,
|
|
ALL_OF,
|
|
NONE_OF
|
|
};
|
|
template<EOperations tag> class Element;
|
|
|
|
typedef Element<ANY_OF> OperatorAny;
|
|
typedef Element<ALL_OF> OperatorAll;
|
|
typedef Element<NONE_OF> OperatorNone;
|
|
|
|
typedef ContainedClass Value;
|
|
|
|
/// Variant that contains all possible elements from logical expression
|
|
typedef boost::variant<
|
|
OperatorAll,
|
|
OperatorAny,
|
|
OperatorNone,
|
|
Value
|
|
> Variant;
|
|
|
|
/// Variant element, contains list of expressions to which operation "tag" should be applied
|
|
template<EOperations tag>
|
|
class Element
|
|
{
|
|
public:
|
|
Element() {}
|
|
Element(std::vector<Variant> expressions):
|
|
expressions(expressions)
|
|
{}
|
|
|
|
std::vector<Variant> expressions;
|
|
|
|
bool operator == (const Element & other) const
|
|
{
|
|
return expressions == other.expressions;
|
|
}
|
|
|
|
template <typename Handler>
|
|
void serialize(Handler & h, const int version)
|
|
{
|
|
h & expressions;
|
|
}
|
|
};
|
|
};
|
|
|
|
/// Visitor to test result (true/false) of the expression
|
|
template <typename ContainedClass>
|
|
class TestVisitor : public boost::static_visitor<bool>
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
std::function<bool(const typename Base::Value &)> classTest;
|
|
|
|
size_t countPassed(const std::vector<typename Base::Variant> & element) const
|
|
{
|
|
return boost::range::count_if(element, [&](const typename Base::Variant & expr)
|
|
{
|
|
return boost::apply_visitor(*this, expr);
|
|
});
|
|
}
|
|
public:
|
|
TestVisitor(std::function<bool (const typename Base::Value &)> classTest):
|
|
classTest(classTest)
|
|
{}
|
|
|
|
bool operator()(const typename Base::OperatorAny & element) const
|
|
{
|
|
return countPassed(element.expressions) != 0;
|
|
}
|
|
|
|
bool operator()(const typename Base::OperatorAll & element) const
|
|
{
|
|
return countPassed(element.expressions) == element.expressions.size();
|
|
}
|
|
|
|
bool operator()(const typename Base::OperatorNone & element) const
|
|
{
|
|
return countPassed(element.expressions) == 0;
|
|
}
|
|
|
|
bool operator()(const typename Base::Value & element) const
|
|
{
|
|
return classTest(element);
|
|
}
|
|
};
|
|
|
|
template <typename ContainedClass>
|
|
class SatisfiabilityVisitor;
|
|
|
|
template <typename ContainedClass>
|
|
class FalsifiabilityVisitor;
|
|
|
|
template <typename ContainedClass>
|
|
class PossibilityVisitor : public boost::static_visitor<bool>
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
protected:
|
|
std::function<bool(const typename Base::Value &)> satisfiabilityTest;
|
|
std::function<bool(const typename Base::Value &)> falsifiabilityTest;
|
|
SatisfiabilityVisitor<ContainedClass> *satisfiabilityVisitor;
|
|
FalsifiabilityVisitor<ContainedClass> *falsifiabilityVisitor;
|
|
|
|
size_t countSatisfiable(const std::vector<typename Base::Variant> & element) const
|
|
{
|
|
return boost::range::count_if(element, [&](const typename Base::Variant & expr)
|
|
{
|
|
return boost::apply_visitor(*satisfiabilityVisitor, expr);
|
|
});
|
|
}
|
|
|
|
size_t countFalsifiable(const std::vector<typename Base::Variant> & element) const
|
|
{
|
|
return boost::range::count_if(element, [&](const typename Base::Variant & expr)
|
|
{
|
|
return boost::apply_visitor(*falsifiabilityVisitor, expr);
|
|
});
|
|
}
|
|
|
|
public:
|
|
PossibilityVisitor(std::function<bool (const typename Base::Value &)> satisfiabilityTest,
|
|
std::function<bool (const typename Base::Value &)> falsifiabilityTest):
|
|
satisfiabilityTest(satisfiabilityTest),
|
|
falsifiabilityTest(falsifiabilityTest),
|
|
satisfiabilityVisitor(nullptr),
|
|
falsifiabilityVisitor(nullptr)
|
|
{}
|
|
|
|
void setSatisfiabilityVisitor(SatisfiabilityVisitor<ContainedClass> *satisfiabilityVisitor)
|
|
{
|
|
this->satisfiabilityVisitor = satisfiabilityVisitor;
|
|
}
|
|
|
|
void setFalsifiabilityVisitor(FalsifiabilityVisitor<ContainedClass> *falsifiabilityVisitor)
|
|
{
|
|
this->falsifiabilityVisitor = falsifiabilityVisitor;
|
|
}
|
|
};
|
|
|
|
/// Visitor to test whether expression's value can be true
|
|
template <typename ContainedClass>
|
|
class SatisfiabilityVisitor : public PossibilityVisitor<ContainedClass>
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
public:
|
|
SatisfiabilityVisitor(std::function<bool (const typename Base::Value &)> satisfiabilityTest,
|
|
std::function<bool (const typename Base::Value &)> falsifiabilityTest):
|
|
PossibilityVisitor<ContainedClass>(satisfiabilityTest, falsifiabilityTest)
|
|
{
|
|
this->setSatisfiabilityVisitor(this);
|
|
}
|
|
|
|
bool operator()(const typename Base::OperatorAny & element) const
|
|
{
|
|
return this->countSatisfiable(element.expressions) != 0;
|
|
}
|
|
|
|
bool operator()(const typename Base::OperatorAll & element) const
|
|
{
|
|
return this->countSatisfiable(element.expressions) == element.expressions.size();
|
|
}
|
|
|
|
bool operator()(const typename Base::OperatorNone & element) const
|
|
{
|
|
return this->countFalsifiable(element.expressions) == element.expressions.size();
|
|
}
|
|
|
|
bool operator()(const typename Base::Value & element) const
|
|
{
|
|
return this->satisfiabilityTest(element);
|
|
}
|
|
};
|
|
|
|
/// Visitor to test whether expression's value can be false
|
|
template <typename ContainedClass>
|
|
class FalsifiabilityVisitor : public PossibilityVisitor<ContainedClass>
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
public:
|
|
FalsifiabilityVisitor(std::function<bool (const typename Base::Value &)> satisfiabilityTest,
|
|
std::function<bool (const typename Base::Value &)> falsifiabilityTest):
|
|
PossibilityVisitor<ContainedClass>(satisfiabilityTest, falsifiabilityTest)
|
|
{
|
|
this->setFalsifiabilityVisitor(this);
|
|
}
|
|
|
|
bool operator()(const typename Base::OperatorAny & element) const
|
|
{
|
|
return this->countFalsifiable(element.expressions) == element.expressions.size();
|
|
}
|
|
|
|
bool operator()(const typename Base::OperatorAll & element) const
|
|
{
|
|
return this->countFalsifiable(element.expressions) != 0;
|
|
}
|
|
|
|
bool operator()(const typename Base::OperatorNone & element) const
|
|
{
|
|
return this->countSatisfiable(element.expressions) != 0;
|
|
}
|
|
|
|
bool operator()(const typename Base::Value & element) const
|
|
{
|
|
return this->falsifiabilityTest(element);
|
|
}
|
|
};
|
|
|
|
/// visitor that is trying to generates candidates that must be fulfilled
|
|
/// to complete this expression
|
|
template <typename ContainedClass>
|
|
class CandidatesVisitor : public boost::static_visitor<std::vector<ContainedClass> >
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
typedef std::vector<typename Base::Value> TValueList;
|
|
|
|
TestVisitor<ContainedClass> classTest;
|
|
|
|
public:
|
|
CandidatesVisitor(std::function<bool(const typename Base::Value &)> classTest):
|
|
classTest(classTest)
|
|
{}
|
|
|
|
TValueList operator()(const typename Base::OperatorAny & element) const
|
|
{
|
|
TValueList ret;
|
|
if (!classTest(element))
|
|
{
|
|
for (auto & elem : element.expressions)
|
|
boost::range::copy(boost::apply_visitor(*this, elem), std::back_inserter(ret));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
TValueList operator()(const typename Base::OperatorAll & element) const
|
|
{
|
|
TValueList ret;
|
|
if (!classTest(element))
|
|
{
|
|
for (auto & elem : element.expressions)
|
|
boost::range::copy(boost::apply_visitor(*this, elem), std::back_inserter(ret));
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
TValueList operator()(const typename Base::OperatorNone & element) const
|
|
{
|
|
return TValueList(); //TODO. Implementing this one is not straightforward, if ever possible
|
|
}
|
|
|
|
TValueList operator()(const typename Base::Value & element) const
|
|
{
|
|
if (classTest(element))
|
|
return TValueList();
|
|
else
|
|
return TValueList(1, element);
|
|
}
|
|
};
|
|
|
|
/// Simple foreach visitor
|
|
template <typename ContainedClass>
|
|
class ForEachVisitor : public boost::static_visitor<typename ExpressionBase<ContainedClass>::Variant>
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
std::function<typename Base::Variant(const typename Base::Value &)> visitor;
|
|
|
|
public:
|
|
ForEachVisitor(std::function<typename Base::Variant(const typename Base::Value &)> visitor):
|
|
visitor(visitor)
|
|
{}
|
|
|
|
typename Base::Variant operator()(const typename Base::Value & element) const
|
|
{
|
|
return visitor(element);
|
|
}
|
|
|
|
template <typename Type>
|
|
typename Base::Variant operator()(Type element) const
|
|
{
|
|
for (auto & entry : element.expressions)
|
|
entry = boost::apply_visitor(*this, entry);
|
|
return element;
|
|
}
|
|
};
|
|
|
|
/// Minimizing visitor that removes all redundant elements from variant (e.g. AllOf inside another AllOf can be merged safely)
|
|
template <typename ContainedClass>
|
|
class MinimizingVisitor : public boost::static_visitor<typename ExpressionBase<ContainedClass>::Variant>
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
public:
|
|
typename Base::Variant operator()(const typename Base::Value & element) const
|
|
{
|
|
return element;
|
|
}
|
|
|
|
template <typename Type>
|
|
typename Base::Variant operator()(const Type & element) const
|
|
{
|
|
Type ret;
|
|
|
|
for (auto & entryRO : element.expressions)
|
|
{
|
|
auto entry = boost::apply_visitor(*this, entryRO);
|
|
|
|
try
|
|
{
|
|
// copy entries from child of this type
|
|
auto sublist = boost::get<Type>(entry).expressions;
|
|
std::move(sublist.begin(), sublist.end(), std::back_inserter(ret.expressions));
|
|
}
|
|
catch (boost::bad_get &)
|
|
{
|
|
// different type (e.g. allOf vs oneOf) just copy
|
|
ret.expressions.push_back(entry);
|
|
}
|
|
}
|
|
|
|
for ( auto it = ret.expressions.begin(); it != ret.expressions.end();)
|
|
{
|
|
if (std::find(ret.expressions.begin(), it, *it) != it)
|
|
it = ret.expressions.erase(it); // erase duplicate
|
|
else
|
|
it++; // goto next
|
|
}
|
|
return ret;
|
|
}
|
|
};
|
|
|
|
/// Json parser for expressions
|
|
template <typename ContainedClass>
|
|
class Reader
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
std::function<typename Base::Value(const JsonNode &)> classParser;
|
|
|
|
typename Base::Variant readExpression(const JsonNode & node)
|
|
{
|
|
assert(!node.Vector().empty());
|
|
|
|
std::string type = node.Vector()[0].String();
|
|
if (type == "anyOf")
|
|
return typename Base::OperatorAny(readVector(node));
|
|
if (type == "allOf")
|
|
return typename Base::OperatorAll(readVector(node));
|
|
if (type == "noneOf")
|
|
return typename Base::OperatorNone(readVector(node));
|
|
return classParser(node);
|
|
}
|
|
|
|
std::vector<typename Base::Variant> readVector(const JsonNode & node)
|
|
{
|
|
std::vector<typename Base::Variant> ret;
|
|
ret.reserve(node.Vector().size()-1);
|
|
for (size_t i=1; i < node.Vector().size(); i++)
|
|
ret.push_back(readExpression(node.Vector()[i]));
|
|
return ret;
|
|
}
|
|
public:
|
|
Reader(std::function<typename Base::Value(const JsonNode &)> classParser):
|
|
classParser(classParser)
|
|
{}
|
|
typename Base::Variant operator ()(const JsonNode & node)
|
|
{
|
|
return readExpression(node);
|
|
}
|
|
};
|
|
|
|
/// Serializes expression in JSON format. Part of map format.
|
|
template <typename ContainedClass>
|
|
class Writer : public boost::static_visitor<JsonNode>
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
std::function<JsonNode(const typename Base::Value &)> classPrinter;
|
|
|
|
JsonNode printExpressionList(std::string name, const std::vector<typename Base::Variant> & element) const
|
|
{
|
|
JsonNode ret;
|
|
ret.Vector().resize(1);
|
|
ret.Vector().back().String() = name;
|
|
for (auto & expr : element)
|
|
ret.Vector().push_back(boost::apply_visitor(*this, expr));
|
|
return ret;
|
|
}
|
|
public:
|
|
Writer(std::function<JsonNode(const typename Base::Value &)> classPrinter):
|
|
classPrinter(classPrinter)
|
|
{}
|
|
|
|
JsonNode operator()(const typename Base::OperatorAny & element) const
|
|
{
|
|
return printExpressionList("anyOf", element.expressions);
|
|
}
|
|
|
|
JsonNode operator()(const typename Base::OperatorAll & element) const
|
|
{
|
|
return printExpressionList("allOf", element.expressions);
|
|
}
|
|
|
|
JsonNode operator()(const typename Base::OperatorNone & element) const
|
|
{
|
|
return printExpressionList("noneOf", element.expressions);
|
|
}
|
|
|
|
JsonNode operator()(const typename Base::Value & element) const
|
|
{
|
|
return classPrinter(element);
|
|
}
|
|
};
|
|
|
|
std::string DLL_LINKAGE getTextForOperator(std::string operation);
|
|
|
|
/// Prints expression in human-readable format
|
|
template <typename ContainedClass>
|
|
class Printer : public boost::static_visitor<std::string>
|
|
{
|
|
typedef ExpressionBase<ContainedClass> Base;
|
|
|
|
std::function<std::string(const typename Base::Value &)> classPrinter;
|
|
std::unique_ptr<TestVisitor<ContainedClass>> statusTest;
|
|
mutable std::string prefix;
|
|
|
|
template<typename Operator>
|
|
std::string formatString(std::string toFormat, const Operator & expr) const
|
|
{
|
|
// highlight not fulfilled expressions, if pretty formatting is on
|
|
if (statusTest && !(*statusTest)(expr))
|
|
return "{" + toFormat + "}";
|
|
return toFormat;
|
|
}
|
|
|
|
std::string printExpressionList(const std::vector<typename Base::Variant> & element) const
|
|
{
|
|
std::string ret;
|
|
prefix.push_back('\t');
|
|
for (auto & expr : element)
|
|
ret += prefix + boost::apply_visitor(*this, expr) + "\n";
|
|
prefix.pop_back();
|
|
return ret;
|
|
}
|
|
public:
|
|
Printer(std::function<std::string(const typename Base::Value &)> classPrinter):
|
|
classPrinter(classPrinter)
|
|
{}
|
|
|
|
Printer(std::function<std::string(const typename Base::Value &)> classPrinter, std::function<bool(const typename Base::Value &)> toBool):
|
|
classPrinter(classPrinter),
|
|
statusTest(new TestVisitor<ContainedClass>(toBool))
|
|
{}
|
|
|
|
std::string operator()(const typename Base::OperatorAny & element) const
|
|
{
|
|
return formatString(getTextForOperator("anyOf"), element) + "\n"
|
|
+ printExpressionList(element.expressions);
|
|
}
|
|
|
|
std::string operator()(const typename Base::OperatorAll & element) const
|
|
{
|
|
return formatString(getTextForOperator("allOf"), element) + "\n"
|
|
+ printExpressionList(element.expressions);
|
|
}
|
|
|
|
std::string operator()(const typename Base::OperatorNone & element) const
|
|
{
|
|
return formatString(getTextForOperator("noneOf"), element) + "\n"
|
|
+ printExpressionList(element.expressions);
|
|
}
|
|
|
|
std::string operator()(const typename Base::Value & element) const
|
|
{
|
|
return formatString(classPrinter(element), element);
|
|
}
|
|
};
|
|
}
|
|
|
|
///
|
|
/// Class for evaluation of logical expressions generated in runtime
|
|
///
|
|
template<typename ContainedClass>
|
|
class LogicalExpression
|
|
{
|
|
typedef LogicalExpressionDetail::ExpressionBase<ContainedClass> Base;
|
|
public:
|
|
/// Type of values used in expressions, same as ContainedClass
|
|
typedef typename Base::Value Value;
|
|
/// Operators for use in expressions, all include vectors with operands
|
|
typedef typename Base::OperatorAny OperatorAny;
|
|
typedef typename Base::OperatorAll OperatorAll;
|
|
typedef typename Base::OperatorNone OperatorNone;
|
|
/// one expression entry
|
|
typedef typename Base::Variant Variant;
|
|
|
|
private:
|
|
Variant data;
|
|
|
|
public:
|
|
/// Base constructor
|
|
LogicalExpression()
|
|
{}
|
|
|
|
/// Constructor from variant or (implicitly) from Operator* types
|
|
LogicalExpression(const Variant & data):
|
|
data(data)
|
|
{
|
|
}
|
|
|
|
/// Constructor that receives JsonNode as input and function that can parse Value instances
|
|
LogicalExpression(const JsonNode & input, std::function<Value(const JsonNode &)> parser)
|
|
{
|
|
LogicalExpressionDetail::Reader<Value> reader(parser);
|
|
LogicalExpression expr(reader(input));
|
|
std::swap(data, expr.data);
|
|
}
|
|
|
|
Variant get() const
|
|
{
|
|
return data;
|
|
}
|
|
|
|
/// Simple visitor that visits all entries in expression
|
|
Variant morph(std::function<Variant(const Value &)> morpher) const
|
|
{
|
|
LogicalExpressionDetail::ForEachVisitor<Value> visitor(morpher);
|
|
return boost::apply_visitor(visitor, data);
|
|
}
|
|
|
|
/// Minimizes expression, removing any redundant elements
|
|
void minimize()
|
|
{
|
|
LogicalExpressionDetail::MinimizingVisitor<Value> visitor;
|
|
data = boost::apply_visitor(visitor, data);
|
|
}
|
|
|
|
/// calculates if expression evaluates to "true".
|
|
/// Note: empty expressions always return true
|
|
bool test(std::function<bool(const Value &)> toBool) const
|
|
{
|
|
LogicalExpressionDetail::TestVisitor<Value> testVisitor(toBool);
|
|
return boost::apply_visitor(testVisitor, data);
|
|
}
|
|
|
|
/// calculates if expression can evaluate to "true".
|
|
bool satisfiable(std::function<bool(const Value &)> satisfiabilityTest, std::function<bool(const Value &)> falsifiabilityTest) const
|
|
{
|
|
LogicalExpressionDetail::SatisfiabilityVisitor<Value> satisfiabilityVisitor(satisfiabilityTest, falsifiabilityTest);
|
|
LogicalExpressionDetail::FalsifiabilityVisitor<Value> falsifiabilityVisitor(satisfiabilityTest, falsifiabilityTest);
|
|
|
|
satisfiabilityVisitor.setFalsifiabilityVisitor(&falsifiabilityVisitor);
|
|
falsifiabilityVisitor.setSatisfiabilityVisitor(&satisfiabilityVisitor);
|
|
|
|
return boost::apply_visitor(satisfiabilityVisitor, data);
|
|
}
|
|
|
|
/// calculates if expression can evaluate to "false".
|
|
bool falsifiable(std::function<bool(const Value &)> satisfiabilityTest, std::function<bool(const Value &)> falsifiabilityTest) const
|
|
{
|
|
LogicalExpressionDetail::SatisfiabilityVisitor<Value> satisfiabilityVisitor(satisfiabilityTest);
|
|
LogicalExpressionDetail::FalsifiabilityVisitor<Value> falsifiabilityVisitor(falsifiabilityTest);
|
|
|
|
satisfiabilityVisitor.setFalsifiabilityVisitor(&falsifiabilityVisitor);
|
|
falsifiabilityVisitor.setFalsifiabilityVisitor(&satisfiabilityVisitor);
|
|
|
|
return boost::apply_visitor(falsifiabilityVisitor, data);
|
|
}
|
|
|
|
/// generates list of candidates that can be fulfilled by caller (like AI)
|
|
std::vector<Value> getFulfillmentCandidates(std::function<bool(const Value &)> toBool) const
|
|
{
|
|
LogicalExpressionDetail::CandidatesVisitor<Value> candidateVisitor(toBool);
|
|
return boost::apply_visitor(candidateVisitor, data);
|
|
}
|
|
|
|
/// Converts expression in human-readable form
|
|
/// Second version will try to do some pretty printing using H3 text formatting "{}"
|
|
/// to indicate fulfilled components of an expression
|
|
std::string toString(std::function<std::string(const Value &)> toStr) const
|
|
{
|
|
LogicalExpressionDetail::Printer<Value> printVisitor(toStr);
|
|
return boost::apply_visitor(printVisitor, data);
|
|
}
|
|
std::string toString(std::function<std::string(const Value &)> toStr, std::function<bool(const Value &)> toBool) const
|
|
{
|
|
LogicalExpressionDetail::Printer<Value> printVisitor(toStr, toBool);
|
|
return boost::apply_visitor(printVisitor, data);
|
|
}
|
|
|
|
JsonNode toJson(std::function<JsonNode(const Value &)> toJson) const
|
|
{
|
|
LogicalExpressionDetail::Writer<Value> writeVisitor(toJson);
|
|
return boost::apply_visitor(writeVisitor, data);
|
|
}
|
|
|
|
template <typename Handler>
|
|
void serialize(Handler & h, const int version)
|
|
{
|
|
h & data;
|
|
}
|
|
};
|
|
|
|
VCMI_LIB_NAMESPACE_END
|