source: trunk/yao/share/antlr-2.7.7/lib/cpp/antlr/ASTFactory.hpp

#ifndef INC_ASTFactory_hpp__
#define INC_ASTFactory_hpp__

/* ANTLR Translator Generator
 * Project led by Terence Parr at http://www.jGuru.com
 * Software rights: http://www.antlr.org/license.html
 *
 * $Id: //depot/code/org.antlr/release/antlr-2.7.7/lib/cpp/antlr/ASTFactory.hpp#2 $
 */

#include <antlr/config.hpp>
#include <antlr/AST.hpp>
#include <antlr/ASTArray.hpp>
#include <antlr/ASTPair.hpp>

#include <istream>
#include <utility>

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

// Using these extra types to appease MSVC
typedef RefAST (*factory_type_)();
typedef ANTLR_USE_NAMESPACE(std)pair< const char*, factory_type_ >  factory_descriptor_;
typedef ANTLR_USE_NAMESPACE(std)vector< factory_descriptor_* >      factory_descriptor_list_;

/** AST Super Factory shared by TreeParser and Parser.
 * This super factory maintains a map of all AST node types to their respective
 * AST factories. One instance should be shared among a parser/treeparser
 * chain.
 *
 * @todo check all this code for possible use of references in
 * stead of RefAST's.
 */
class ANTLR_API ASTFactory {
public:
        typedef factory_type_             factory_type;
        typedef factory_descriptor_       factory_descriptor;
        typedef factory_descriptor_list_  factory_descriptor_list;
protected:
        /* The mapping of AST node type to factory..
         */
        factory_descriptor default_factory_descriptor;
        factory_descriptor_list nodeFactories;
public:
        /// Make new factory. Per default (Ref)CommonAST instances are generated.
        ASTFactory();
        /** Initialize factory with a non default node type.
         * factory_node_name should be the name of the AST node type the factory
         * generates. (should exist during the existance of this ASTFactory
         * instance)
         */
        ASTFactory( const char* factory_node_name, factory_type factory );
        /// Destroy factory
        virtual ~ASTFactory();

        /// Register a node factory for the node type type with name ast_name
        void registerFactory( int type, const char* ast_name, factory_type factory );
        /// Set the maximum node (AST) type this factory may encounter
        void setMaxNodeType( int type );

        /// Add a child to the current AST
        void addASTChild(ASTPair& currentAST, RefAST child);
        /// Create new empty AST node. The right default type shou
        virtual RefAST create();
        /// Create AST node of the right type for 'type'
        RefAST create(int type);
        /// Create AST node of the right type for 'type' and initialize with txt
        RefAST create(int type, const ANTLR_USE_NAMESPACE(std)string& txt);
        /// Create duplicate of tr
        RefAST create(RefAST tr);
        /// Create new AST node and initialize contents from a token.
        RefAST create(RefToken tok);
        /// Create new AST node and initialize contents from a stream.
        RefAST create(const ANTLR_USE_NAMESPACE(std)string& txt, ANTLR_USE_NAMESPACE(std)istream& infile );
        /** Deep copy a single node. This function the new clone() methods in the
         * AST interface. Returns a new RefAST(nullASTptr) if t is null.
         */
        RefAST dup(RefAST t);
        /// Duplicate tree including siblings of root.
        RefAST dupList(RefAST t);
        /** Duplicate a tree, assuming this is a root node of a tree--
         * duplicate that node and what's below; ignore siblings of root node.
         */
        RefAST dupTree(RefAST t);
        /** Make a tree from a list of nodes. The first element in the
         * array is the root. If the root is null, then the tree is
         * a simple list not a tree. Handles null children nodes correctly.
         * For example, make(a, b, null, c) yields tree (a b c).  make(null,a,b)
         * yields tree (nil a b).
         */
        RefAST make(ANTLR_USE_NAMESPACE(std)vector<RefAST>& nodes);
        /** Make a tree from a list of nodes, where the nodes are contained
         * in an ASTArray object. The ASTArray is deleted after use.
         * @todo FIXME! I have a feeling we can get rid of this ugly ASTArray thing
         */
        RefAST make(ASTArray* nodes);
        /// Make an AST the root of current AST
        void makeASTRoot(ASTPair& currentAST, RefAST root);

        /** Set a new default AST type.
         * factory_node_name should be the name of the AST node type the factory
         * generates. (should exist during the existance of this ASTFactory
         * instance).
         * Only change factory between parser runs. You might get unexpected results
         * otherwise.
         */
        void setASTNodeFactory( const char* factory_node_name, factory_type factory );

#ifdef ANTLR_SUPPORT_XML
        /** Load a XML AST from stream. Make sure you have all the factories
         * registered before use.
         * @note this 'XML' stuff is quite rough still. YMMV.
         */
        RefAST LoadAST( ANTLR_USE_NAMESPACE(std)istream& infile );
#endif
protected:
        void loadChildren( ANTLR_USE_NAMESPACE(std)istream& infile, RefAST current );
        void loadSiblings( ANTLR_USE_NAMESPACE(std)istream& infile, RefAST current );
        bool checkCloseTag( ANTLR_USE_NAMESPACE(std)istream& infile );

#ifdef ANTLR_VECTOR_HAS_AT
        /// construct a node of 'type'
        inline RefAST getNodeOfType( unsigned int type )
        {
                return RefAST(nodeFactories.at(type)->second());
        }
        /// get the name of the node 'type'
        const char* getASTNodeType( unsigned int type )
        {
                return nodeFactories.at(type)->first;
        }
        /// get the factory used for node 'type'
        factory_type getASTNodeFactory( unsigned int type )
        {
                return nodeFactories.at(type)->second;
        }
#else
        inline RefAST getNodeOfType( unsigned int type )
        {
                return RefAST(nodeFactories[type]->second());
        }
        /// get the name of the node 'type'
        const char* getASTNodeType( unsigned int type )
        {
                return nodeFactories[type]->first;
        }
        factory_type getASTNodeFactory( unsigned int type )
        {
                return nodeFactories[type]->second;
        }
#endif

private:
        // no copying and such..
        ASTFactory( const ASTFactory& );
        ASTFactory& operator=( const ASTFactory& );
};

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif //INC_ASTFactory_hpp__