source: trunk/yao/share/antlr-2.7.7/lib/cpp/antlr/AST.hpp @ 1

#ifndef INC_AST_hpp__
#define INC_AST_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/AST.hpp#2 $
 */

#include <antlr/config.hpp>
#include <antlr/ASTRefCount.hpp>
#include <antlr/Token.hpp>
#include <vector>
#include <string>

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
namespace antlr {
#endif

struct ASTRef;

class ANTLR_API AST {
public:
        AST() : ref(0) {}
        AST(const AST&) : ref(0) {}
        virtual ~AST() {}

        /// Return the type name for this AST node. (for XML output)
        virtual const char* typeName( void ) const = 0;
        /// Clone this AST node.
        virtual RefAST clone( void ) const = 0;
   /// Is node t equal to this in terms of token type and text?
        virtual bool equals(RefAST t) const = 0;
   /** Is t an exact structural and equals() match of this tree. The
         * 'this' reference is considered the start of a sibling list.
         */
        virtual bool equalsList(RefAST t) const = 0;

        /** Is 't' a subtree of this list? The siblings of the root are NOT ignored.
    */
        virtual bool equalsListPartial(RefAST t) const = 0;
        /** Is tree rooted at 'this' equal to 't'?  The siblings of 'this' are
         * ignored.
         */
        virtual bool equalsTree(RefAST t) const = 0;
        /** Is 't' a subtree of the tree rooted at 'this'? The siblings of
         * 'this' are ignored.
         */
        virtual bool equalsTreePartial(RefAST t) const = 0;

        /** Walk the tree looking for all exact subtree matches.  Return
         *  a vector of RefAST that lets the caller walk the list
         *  of subtree roots found herein.
         */
        virtual ANTLR_USE_NAMESPACE(std)vector<RefAST> findAll(RefAST t) = 0;

   /** Walk the tree looking for all subtrees.  Return
    *  a vector of RefAST that lets the caller walk the list
    *  of subtree roots found herein.
    */
        virtual ANTLR_USE_NAMESPACE(std)vector<RefAST> findAllPartial(RefAST t) = 0;

   /// Add a node to the end of the child list for this node
        virtual void addChild(RefAST c) = 0;
        /// Get the number of children. Returns 0 if the node is a leaf
        virtual size_t getNumberOfChildren() const = 0;

        /// Get the first child of this node; null if no children
        virtual RefAST getFirstChild() const = 0;
        /// Get  the next sibling in line after this one
        virtual RefAST getNextSibling() const = 0;

        /// Get the token text for this node
        virtual ANTLR_USE_NAMESPACE(std)string getText() const = 0;
        /// Get the token type for this node
        virtual int getType() const = 0;

        /** Various initialization routines. Used by several factories to initialize
         * an AST element.
         */
        virtual void initialize(int t, const ANTLR_USE_NAMESPACE(std)string& txt) = 0;
        virtual void initialize(RefAST t) = 0;
        virtual void initialize(RefToken t) = 0;

#ifdef ANTLR_SUPPORT_XML
        /** initialize this node from the contents of a stream.
         * @param in the stream to read the AST attributes from.
         */
        virtual void initialize( ANTLR_USE_NAMESPACE(std)istream& in ) = 0;
#endif

        /// Set the first child of a node.
        virtual void setFirstChild(RefAST c) = 0;
        /// Set the next sibling after this one.
        virtual void setNextSibling(RefAST n) = 0;

        /// Set the token text for this node
        virtual void setText(const ANTLR_USE_NAMESPACE(std)string& txt) = 0;
        /// Set the token type for this node
        virtual void setType(int type) = 0;

        /// Return this AST node as a string
        virtual ANTLR_USE_NAMESPACE(std)string toString() const = 0;

        /// Print out a child-sibling tree in LISP notation
        virtual ANTLR_USE_NAMESPACE(std)string toStringList() const = 0;
        virtual ANTLR_USE_NAMESPACE(std)string toStringTree() const = 0;

#ifdef ANTLR_SUPPORT_XML
        /** get attributes of this node to 'out'. Override to customize XML
         * output.
         * @param out the stream to write the AST attributes to.
         * @returns if a explicit closetag should be written
         */
        virtual bool attributesToStream( ANTLR_USE_NAMESPACE(std)ostream& out ) const = 0;

        /** Print a symbol over ostream. Overload this one to customize the XML
         * output for AST derived AST-types
         * @param output stream
         */
        virtual void toStream( ANTLR_USE_NAMESPACE(std)ostream &out ) const = 0;

        /** Dump AST contents in XML format to output stream.
         * Works in conjunction with to_stream method. Overload that one is
         * derived classes to customize behaviour.
         * @param output stream to write to string to put the stuff in.
         * @param ast RefAST object to write.
         */
        friend ANTLR_USE_NAMESPACE(std)ostream& operator<<( ANTLR_USE_NAMESPACE(std)ostream& output, const RefAST& ast );
#endif

private:
        friend struct ASTRef;
        ASTRef* ref;

        AST(RefAST other);
        AST& operator=(const AST& other);
        AST& operator=(RefAST other);
};

#ifdef ANTLR_SUPPORT_XML
inline ANTLR_USE_NAMESPACE(std)ostream& operator<<( ANTLR_USE_NAMESPACE(std)ostream& output, const RefAST& ast )
{
        ast->toStream(output);
        return output;
}
#endif

extern ANTLR_API RefAST nullAST;
extern ANTLR_API AST* const nullASTptr;

#ifdef NEEDS_OPERATOR_LESS_THAN
// RK: apparently needed by MSVC and a SUN CC, up to and including
// 2.7.2 this was undefined ?
inline bool operator<( RefAST l, RefAST r )
{
        return nullAST == l ? ( nullAST == r ? false : true ) : l->getType() < r->getType();
}
#endif

#ifdef ANTLR_CXX_SUPPORTS_NAMESPACE
}
#endif

#endif //INC_AST_hpp__