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// -*- C++ -*-
//=============================================================================
/**
* @file ETCL_Interpreter.h
*
* @author Jeff Parsons <parsons@cs.wustl.edu> based on previous work by
* @author Seth Widoff <sbw1@cs.wustl.edu>
*/
//=============================================================================
#ifndef ETCL_INTERPRETER_H
#define ETCL_INTERPRETER_H
#include /**/ "ace/pre.h"
#include "ace/Thread_Mutex.h"
#if !defined (ACE_LACKS_PRAGMA_ONCE)
# pragma once
#endif /* ACE_LACKS_PRAGMA_ONCE */
#include "ace/Synch_Traits.h"
#include "etcl_parser_export.h"
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
class ETCL_Constraint;
ACE_END_VERSIONED_NAMESPACE_DECL
ACE_BEGIN_VERSIONED_NAMESPACE_DECL
/**
* @class ETCL_Interpreter
*
* @brief ETCL_Interpreter is the superclass for all ETCL interpreters.
* Its build tree method invokes the yacc parser to parse a constraint
* or preference string.
*/
class ETCL_Parser_Export ETCL_Interpreter
{
protected:
/// Constructor.
ETCL_Interpreter (void);
/// Destructor.
virtual ~ETCL_Interpreter (void);
/// Using the Yacc generated parser, construct an expression tree
/// representing @a constraints from the tokens returned by it.
int build_tree (const char* constraints);
static int is_empty_string (const char* str);
/// The root of the expression tree, not equal to null if build_tree
/// successfully builds a tree from the constraints.
ETCL_Constraint* root_;
private:
/// This mutex protects the <build_tree> method from reentrance.
static ACE_SYNCH_MUTEX parserMutex__;
};
// Functions we need for parsing.
extern int yyparse (void);
extern void yyrestart (FILE*);
extern int yylex (void);
// Have yylex read from the constraint string, not from stdin.
#undef YY_INPUT
#define YY_INPUT(b, r, ms) (r = Lex_String_Input::copy_into(b, ms))
/**
* @class Lex_String_Input
*
* @brief Have Lex read from a string and not from stdin. Essentially,
* the interpreter needs to call yylex() until EOF, and call
* TAO_Lex_String_Input::reset() with the new string, prior to
* calling yyparse.
*/
class Lex_String_Input
{
public:
/// Reset the lex input.
static void reset (char* input_string);
/// Method lex will call to read from the input string.
static int copy_into (char* buf, int max_size);
private:
/// Pointers to keep track of the input string.
static char* string_;
static char* current_;
static char* end_;
};
/// The union used by lex and bison to build the Abstract Syntax Tree.
typedef union
{
ACE_VERSIONED_NAMESPACE_NAME::ETCL_Constraint* constraint;
} YYSTYPE;
extern YYSTYPE yylval;
extern YYSTYPE yyval;
ACE_END_VERSIONED_NAMESPACE_DECL
#include /**/ "ace/post.h"
#endif // ETCL_INTERPRETER_H
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