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// **********************************************************************
//
// Copyright (c) 2003-2011 ZeroC, Inc. All rights reserved.
//
// This copy of Ice is licensed to you under the terms described in the
// ICE_LICENSE file included in this distribution.
//
// **********************************************************************
#ifndef FREEZE_SCRIPT_PARSER_H
#define FREEZE_SCRIPT_PARSER_H
#include <FreezeScript/Data.h>
namespace FreezeScript
{
class SymbolTable;
typedef IceUtil::Handle<SymbolTable> SymbolTablePtr;
class Node;
typedef IceUtil::Handle<Node> NodePtr;
typedef std::vector<NodePtr> NodeList;
class EntityNode;
typedef IceUtil::Handle<EntityNode> EntityNodePtr;
//
// parseExpression parses the given expression and returns the root node of the parse tree.
//
NodePtr parseExpression(const std::string&, const DataFactoryPtr&, const ErrorReporterPtr&);
//
// EvaluateException is raised by Node::evaluate().
//
class EvaluateException : public IceUtil::Exception
{
public:
EvaluateException(const char*, int, const std::string&);
virtual ~EvaluateException() throw();
virtual std::string ice_name() const;
virtual void ice_print(std::ostream&) const;
virtual IceUtil::Exception* ice_clone() const;
virtual void ice_throw() const;
std::string reason() const;
private:
std::string _reason;
static const char* _name;
};
//
// SymbolTable is an interface for the lookup operations required by node evaluation.
//
class SymbolTable : public IceUtil::SimpleShared
{
public:
virtual ~SymbolTable();
virtual void add(const std::string&, const DataPtr&) = 0;
virtual DataPtr getValue(const EntityNodePtr&) const = 0;
virtual DataPtr getConstantValue(const std::string&) const = 0;
virtual SymbolTablePtr createChild() = 0;
virtual Slice::TypePtr lookupType(const std::string&) = 0;
virtual DataPtr invokeFunction(const std::string&, const DataPtr&, const DataList&) = 0;
};
class Node : public IceUtil::SimpleShared
{
public:
virtual ~Node();
virtual DataPtr evaluate(const SymbolTablePtr&) = 0;
virtual void print(std::ostream&) const = 0;
};
enum BinaryOperator
{
BinOpOr, BinOpAnd,
BinOpMul, BinOpDiv, BinOpMod,
BinOpAdd, BinOpSub,
BinOpLess, BinOpGreater, BinOpLessEq, BinOpGrEq, BinOpEq, BinOpNotEq
};
class BinaryNode : public Node
{
public:
BinaryNode(BinaryOperator, const DataFactoryPtr&, const NodePtr&, const NodePtr&);
virtual DataPtr evaluate(const SymbolTablePtr&);
virtual void print(std::ostream&) const;
private:
static std::string opToString(BinaryOperator);
BinaryOperator _op;
DataFactoryPtr _factory;
NodePtr _left;
NodePtr _right;
};
enum UnaryOperator { UnaryOpNeg, UnaryOpNot };
class UnaryNode : public Node
{
public:
UnaryNode(UnaryOperator, const DataFactoryPtr&, const NodePtr&);
virtual DataPtr evaluate(const SymbolTablePtr&);
virtual void print(std::ostream&) const;
private:
static std::string opToString(UnaryOperator);
UnaryOperator _op;
DataFactoryPtr _factory;
NodePtr _right;
};
class DataNode : public Node
{
public:
DataNode(const DataPtr&);
virtual DataPtr evaluate(const SymbolTablePtr&);
virtual void print(std::ostream&) const;
private:
DataPtr _data;
};
class EntityNodeVisitor
{
public:
virtual ~EntityNodeVisitor();
virtual void visitIdentifier(const std::string&) = 0;
virtual void visitElement(const NodePtr&) = 0;
};
class EntityNode : public Node
{
public:
virtual DataPtr evaluate(const SymbolTablePtr&);
virtual void print(std::ostream&) const;
virtual void visit(EntityNodeVisitor&) const = 0;
void append(const EntityNodePtr&);
protected:
EntityNodePtr _next;
};
class IdentNode : public EntityNode
{
public:
IdentNode(const std::string&);
virtual void visit(EntityNodeVisitor&) const;
std::string getValue() const;
private:
std::string _value;
};
typedef IceUtil::Handle<IdentNode> IdentNodePtr;
class ElementNode : public EntityNode
{
public:
ElementNode(const NodePtr&);
virtual void visit(EntityNodeVisitor&) const;
NodePtr getValue() const;
private:
NodePtr _value;
};
typedef IceUtil::Handle<ElementNode> ElementNodePtr;
class FunctionNode : public Node
{
public:
FunctionNode(const std::string&, const NodeList&);
virtual DataPtr evaluate(const SymbolTablePtr&);
virtual void print(std::ostream&) const;
void setTarget(const EntityNodePtr&);
private:
std::string _name;
NodeList _args;
EntityNodePtr _target;
};
typedef IceUtil::Handle<FunctionNode> FunctionNodePtr;
class ConstantNode : public Node
{
public:
ConstantNode(const std::string&);
virtual DataPtr evaluate(const SymbolTablePtr&);
virtual void print(std::ostream&) const;
private:
std::string _value;
};
} // End of namespace FreezeScript
std::ostream& operator<<(std::ostream&, const FreezeScript::EntityNodePtr&);
#endif
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