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117 lines
2.8 KiB
C++
117 lines
2.8 KiB
C++
// -*- C++ -*-
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//=============================================================================
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/**
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* @file ETCL_Interpreter.h
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*
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* $Id: ETCL_Interpreter.h 82434 2008-07-28 11:40:36Z johnnyw $
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*
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* @author Jeff Parsons <parsons@cs.wustl.edu> based on previous work by
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* @author Seth Widoff <sbw1@cs.wustl.edu>
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*/
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//=============================================================================
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#ifndef ETCL_INTERPRETER_H
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#define ETCL_INTERPRETER_H
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#include /**/ "ace/pre.h"
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#include "ace/Thread_Mutex.h"
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#if !defined (ACE_LACKS_PRAGMA_ONCE)
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# pragma once
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#endif /* ACE_LACKS_PRAGMA_ONCE */
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#include "ace/Synch_Traits.h"
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#include "etcl_parser_export.h"
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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class ETCL_Constraint;
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ACE_END_VERSIONED_NAMESPACE_DECL
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ETCL_Interpreter
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*
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* @brief ETCL_Interpreter is the superclass for all ETCL interpreters.
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* Its build tree method invokes the yacc parser to parse a constraint
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* or preference string.
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*/
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class ETCL_Parser_Export ETCL_Interpreter
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{
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protected:
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// = Initialization and termination methods.
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/// Constructor.
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ETCL_Interpreter (void);
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/// Destructor.
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virtual ~ETCL_Interpreter (void);
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/// Using the Yacc generated parser, construct an expression tree
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/// representing @a constraints from the tokens returned by it.
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int build_tree (const char* constraints);
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static int is_empty_string (const char* str);
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/// The root of the expression tree, not equal to null if build_tree
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/// successfully builds a tree from the constraints.
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ETCL_Constraint* root_;
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private:
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/// This mutex protects the <build_tree> method from reentrance.
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static ACE_SYNCH_MUTEX parserMutex__;
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};
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// Functions we need for parsing.
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extern int yyparse (void);
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extern void yyrestart (FILE*);
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extern int yylex (void);
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// Have yylex read from the constraint string, not from stdin.
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#undef YY_INPUT
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#define YY_INPUT(b, r, ms) (r = Lex_String_Input::copy_into(b, ms))
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/**
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* @class Lex_String_Input
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*
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* @brief Have Lex read from a string and not from stdin. Essentially,
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* the interpreter needs to call yylex() until EOF, and call
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* TAO_Lex_String_Input::reset() with the new string, prior to
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* calling yyparse.
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*/
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class Lex_String_Input
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{
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public:
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/// Reset the lex input.
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static void reset (char* input_string);
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/// Method lex will call to read from the input string.
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static int copy_into (char* buf, int max_size);
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private:
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/// Pointers to keep track of the input string.
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static char* string_;
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static char* current_;
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static char* end_;
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};
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/// The union used by lex and bison to build the Abstract Syntax Tree.
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typedef union
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{
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ACE_VERSIONED_NAMESPACE_NAME::ETCL_Constraint* constraint;
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} YYSTYPE;
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extern YYSTYPE yylval;
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extern YYSTYPE yyval;
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ACE_END_VERSIONED_NAMESPACE_DECL
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#include /**/ "ace/post.h"
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#endif // ETCL_INTERPRETER_H
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