-- File:	ExprIntrp.cdl
-- Created:	Thu Jul 18 18:10:24 1991
-- Author:	Arnaud BOUZY
--		<adn@topsn2>
---Copyright:	 Matra Datavision 1991, 1992


package ExprIntrp 

	---Purpose: Describes an interpreter for GeneralExpressions, 
	--          GeneralFunctions, and GeneralRelations defined in 
	--          package Expr. 

uses Expr, MMgt, TCollection, TColStd

is

    deferred class Generator;
    
    class GenExp;
    
    class GenFct;
    
    class GenRel;
    
    private class Analysis;
    
    class SequenceOfNamedFunction instantiates 
    	Sequence from TCollection(NamedFunction from Expr);

    class SequenceOfNamedExpression instantiates 
    	Sequence from TCollection(NamedExpression from Expr);

    exception SyntaxError inherits Failure from Standard;
    
    private class StackOfGeneralExpression instantiates 
    	Stack from TCollection (GeneralExpression from Expr);
    
    private class StackOfGeneralRelation instantiates 
    	Stack from TCollection (GeneralRelation from Expr);

    private class StackOfGeneralFunction instantiates 
    	Stack from TCollection (GeneralFunction from Expr);
        
    
    private class StackOfNames instantiates 
    	Stack from TCollection (AsciiString from TCollection);

    Parse(gen : Generator; str : AsciiString from TCollection)
    returns Boolean
    is private;
    
end ExprIntrp;