www.pudn.com > 12cocorc.zip > CR_ABS.HPP

//********************************************************** 
//   CR_ABS.HPP 
//   Coco/R C++ Support Library. 
//   Author: Frankie Arzu  
// 
//   Jun 12, 1996  Version 1.06 
//      Many fixes and suggestions thanks to 
//      Pat Terry  
//   May 05, 1999  Version 1.12 
//      Added options to retrieve token info 
//********************************************************** 
 
#ifndef CR_ABS 
#define CR_ABS 
 
#include  
 
class AbsToken { 
// Abstract Token 
  public: 
    int  Sym;              // Token Number 
    int  Line, Col;        // line and column of current Token 
    int  Len;              // length of current Token 
    long Pos;              // file position of current Token 
    int GetSym() 
      { return Sym; } 
    int SetSym(int sym) 
      { return Sym = sym; }; 
    long GetPos() 
      { return Pos; }; 
    void Init(int sym = 0, int line = 0, int col = 0, long pos = 0, int len = 0) 
      { Sym = sym; Line = line; Col = col; Pos = pos; Len = len; }; 
}; 
 
class AbsScanner { 
// Abstract Scanner 
  public: 
    AbsToken CurrSym;      // current (most recently parsed) token 
    AbsToken NextSym;      // next (look ahead) token 
 
    virtual int Get() = 0; 
    // Retrieves next token 
 
    virtual void Reset() = 0; 
    // Reset the scanner 
 
    virtual unsigned char CurrentCh(long pos) = 0; 
    // Returns character at position pos in source file 
 
    virtual void GetString(AbsToken *Sym, char *Buffer, int Max) = 0; 
    // Retrieves at most Max characters from Sym into Buffer 
 
    virtual void GetString(long Pos, char *Buffer, int Max) = 0; 
    // Retrieves at most Max characters from position Pos into Buffer 
 
    virtual void GetName(AbsToken *Sym, char *Buffer, int Max) = 0; 
    // Retrieves at most Max characters from Sym into Buffer 
    // Buffer is capitalized if IGNORE CASE was specified 
 
    virtual long GetLine(long Pos, char *Line, int Max) = 0; 
    // Retrieves at most Max characters (or until next line break) 
    // from position Pos in source file into Line 
}; 
 
class AbsError { 
// Abstract Error Reporting 
  public: 
    virtual void Store(int nr, int line, int col, long pos) = 0; 
    // Records that error nr has been detected at specified position 
 
    virtual void StoreErr(int nr, AbsToken &Token) = 0; 
    // Associates error nr with Token 
 
    virtual void StoreWarn(int nr, AbsToken &Token) = 0; 
    // Associates warning nr with Token 
 
    virtual void SummarizeErrors() = 0; 
    // Reports on all errors recorded 
}; 
 
#endif // CR_ABS