include/AD/automata/llkgen.h

   1 //////////////////////////////////////////////////////////////////////////////
   2 // NOTICE:
   3 //
   4 // ADLib, Prop and their related set of tools and documentation are in the
   5 // public domain.   The author(s) of this software reserve no copyrights on
   6 // the source code and any code generated using the tools.  You are encouraged
   7 // to use ADLib and Prop to develop software, in both academic and commercial
   8 // settings, and are free to incorporate any part of ADLib and Prop into
   9 // your programs.
  10 //
  11 // Although you are under no obligation to do so, we strongly recommend that
  12 // you give away all software developed using our tools.
  13 //
  14 // We also ask that credit be given to us when ADLib and/or Prop are used in
  15 // your programs, and that this notice be preserved intact in all the source
  16 // code.
  17 //
  18 // This software is still under development and we welcome any suggestions
  19 // and help from the users.
  20 //
  21 // Allen Leung
  22 // 1994
  23 //////////////////////////////////////////////////////////////////////////////
  24
  25 #ifndef LL_k_parser_generator_h
  26 #define LL_k_parser_generator_h
  27
  28 #include <iostream>
  29 #include <AD/automata/grammar.h>
  30 #include <AD/automata/sparsdfa.h>
  31
  32 //////////////////////////////////////////////////////////////////////////////
  33 // LL(k) parser generator class.  The algorithm we use is described in
  34 // Terrance Parr's thesis on (you guess it) LL(k) parser generation.
  35 //////////////////////////////////////////////////////////////////////////////
  36 class LLkGen : protected SparseDFA {
  37
  38    LLkGen(const LLkGen&);           // no copy constructor
  39    void operator = (const LLkGen&); // no assignment
  40
  41 public:
  42
  43    ///////////////////////////////////////////////////////////////////////////
  44    //  Inherit some types
  45    ///////////////////////////////////////////////////////////////////////////
  46    typedef SparseDFA     Super;
  47    typedef Super::State  State;
  48    typedef Super::Rule   Rule;
  49    typedef Super::Symbol Symbol;
  50
  51 public:
  52
  53    ///////////////////////////////////////////////////////////////////////////
  54    //  Constructor and destructor
  55    ///////////////////////////////////////////////////////////////////////////
  56    LLkGen();
  57    LLkGen(const Grammar&);
  58   ~LLkGen();
  59
  60    ///////////////////////////////////////////////////////////////////////////
  61    //  Compilation and code generation
  62    ///////////////////////////////////////////////////////////////////////////
  63    virtual void     compile (const Grammar&);
  64    virtual std::ostream& gen_code(std::ostream&, const char []) const;
  65 };
  66
  67 #endif