Logo Search packages:      
Sourcecode: pccts version File versions  Download package


/* ANTLRParser.h
 * Define the generic ANTLRParser superclass, which is subclassed to
 * define an actual parser.
 * Before entry into this file: ANTLRTokenType must be set.
 * We reserve no LEGAL rights to the Purdue Compiler Construction Tool
 * Set (PCCTS) -- PCCTS is in the public domain.  An individual or
 * company may do whatever they wish with source code distributed with
 * PCCTS or the code generated by PCCTS, including the incorporation of
 * PCCTS, or its output, into commerical software.
 * We encourage users to develop software with PCCTS.  However, we do ask
 * that credit is given to us for developing PCCTS.  By "credit",
 * we mean that if you incorporate our source code into one of your
 * programs (commercial product, research project, or otherwise) that you
 * acknowledge this fact somewhere in the documentation, research report,
 * etc...  If you like PCCTS and have developed a nice tool with the
 * output, please mention that you developed it using PCCTS.  In
 * addition, we ask that this header remain intact in our source code.
 * As long as these guidelines are kept, we expect to continue enhancing
 * this system and expect to make other tools available as they are
 * completed.
 * ANTLR 1.33
 * Terence Parr
 * Parr Research Corporation
 * with Purdue University and AHPCRC, University of Minnesota
 * 1989-2000


#include "pcctscfg.h"

#include "pccts_stdio.h"
#include "pccts_setjmp.h"


#include ATOKEN_H

#ifndef ZZINF_LOOK
#define ZZINF_LOOK

#define NLA             (token_type[lap&(LLk-1)])/* --> next LA */

typedef unsigned char SetWordType;

/* Define external bit set stuff (for SetWordType) */
#define EXT_WORDSIZE    (sizeof(char)*8)

           /* s y n t a c t i c  p r e d i c a t e  s t u f f */

#define zzUSER_GUESS_HOOK(seqFrozen,zzrv)

#define zzUSER_GUESS_DONE_HOOK(seqFrozen)

/* MR14 Add zzUSER_GUESS_FAIL_HOOK and related code */

#define zzUSER_GUESS_FAIL_HOOK(zzGuessSeq)

typedef struct _zzjmp_buf {
                  jmp_buf state;
            } zzjmp_buf;

/* these need to be macros not member functions */
#define zzGUESS_BLOCK         ANTLRParserState zzst; int zzrv; int _marker; int zzGuessSeqFrozen;
#define zzNON_GUESS_MODE      if ( !guessing )
#define zzGUESS_FAIL          guess_fail();

/*  Note:  zzGUESS_DONE does not execute longjmp() */

#define zzGUESS_DONE          {zzrv=1; inputTokens->rewind(_marker); guess_done(&zzst);zzUSER_GUESS_DONE_HOOK(zzGuessSeqFrozen) }
#define zzGUESS                     saveState(&zzst); \
                                          guessing = 1; \
                            zzGuessSeqFrozen = ++zzGuessSeq; \
                                          _marker = inputTokens->mark(); \
                                          zzrv = setjmp(guess_start.state); \
                            zzUSER_GUESS_HOOK(zzGuessSeqFrozen,zzrv) \
                                        if ( zzrv ) zzGUESS_DONE

#define zzTRACEdata     const ANTLRChar *zzTracePrevRuleName = NULL;

#ifndef zzTRACEIN
#define zzTRACEIN(r)    zzTracePrevRuleName=traceCurrentRuleName;tracein(r);
#ifndef zzTRACEOUT
#define zzTRACEOUT(r)   traceout(r);traceCurrentRuleName=zzTracePrevRuleName;

                  /* a n t l r  p a r s e r  d e f */

struct ANTLRParserState {
      /* class variables */
      zzjmp_buf guess_start;
      int guessing;

      int inf_labase;
      int inf_last;

      int dirty;

    int             traceOptionValue;       // MR10
    int             traceGuessOptionValue;  // MR10
    const ANTLRChar *traceCurrentRuleName;  // MR10
    int             traceDepth;             // MR10


/* notes:
 * multiple inheritance is a cool way to include what stuff is needed
 * in this structure (like guess stuff).  however, i'm not convinced that
 * multiple inheritance works correctly on all platforms.  not that
 * much space is used--just include all possibly useful members.
 * the class should also be a template with arguments for the lookahead
 * depth and so on.  that way, more than one parser can be defined (as
 * each will probably have different lookahead requirements).  however,
 * am i sure that templates work?  no, i'm not sure.
 * no attributes are maintained and, hence, the 'asp' variable is not
 * needed.  $i can still be referenced, but it refers to the token
 * associated with that rule element.  question: where are the token's
 * stored if not on the software stack?  in local variables created
 * and assigned to by antlr.
class ANTLRParser {
      /* class variables */
      static SetWordType bitmask[sizeof(SetWordType)*8];
      static char eMsgBuffer[500];

      int LLk;                            // number of lookahead symbols (old LL_K)
      int demand_look;
      ANTLRTokenType eofToken;                  // when do I stop during resynch()s
      int bsetsize;                             // size of bitsets created by ANTLR in
                                                      // units of SetWordType

      ANTLRTokenBuffer *inputTokens;      //place to get input tokens

      zzjmp_buf guess_start;        // where to jump back to upon failure
      int guessing;                       // if guessing (using (...)? predicate)

      // infinite lookahead stuff
      int can_use_inf_look;         // set by subclass (generated by ANTLR)
      int inf_lap;
      int inf_labase;
      int inf_last;
      int *_inf_line;

      const ANTLRChar **token_tbl; // pointer to table of token type strings MR20 const

      int dirty;                          // used during demand lookahead

      ANTLRTokenType *token_type;         // fast reference cache of token.getType()
//    ANTLRLightweightToken **token;      // the token with all its attributes
      int lap;
      int labase;
      int stillToFetch;                               // MR19 V.H. Simonis

      void fill_inf_look();

      virtual void guess_fail() {                         // MR9 27-Sep-97 make virtual
        traceGuessFail();                               // MR10
        longjmp(guess_start.state, 1); }                // MR9
      virtual void guess_done(ANTLRParserState *st) {     // MR9 27-Sep-97 make virtual
         restoreState(st); }                            // MR9
      virtual int guess(ANTLRParserState *);              // MR9 27-Sep-97 make virtual
      void look(int);
    int _match(ANTLRTokenType, ANTLRChar **, ANTLRTokenType *,
                     _ANTLRTokenPtr *, SetWordType **);
    int _setmatch(SetWordType *, ANTLRChar **, ANTLRTokenType *,
                     _ANTLRTokenPtr *, SetWordType **,
                     SetWordType * tokclassErrset /* MR23 */);
    int _match_wsig(ANTLRTokenType);
    int _setmatch_wsig(SetWordType *);
    virtual void consume();
    virtual void resynch(SetWordType *wd,SetWordType mask); // MR21
      void prime_lookahead();
      virtual void tracein(const ANTLRChar *r);              // MR10
      virtual void traceout(const ANTLRChar *r);             // MR10
      static unsigned MODWORD(unsigned x) {return x & (EXT_WORDSIZE-1);}      // x % EXT_WORDSIZE // MR9
      static unsigned DIVWORD(unsigned x) {return x >> EXT_LOGWORDSIZE;}      // x / EXT_WORDSIZE // MR9
      int set_deg(SetWordType *);
      int set_el(ANTLRTokenType, SetWordType *);
      virtual void edecode(SetWordType *);                        // MR1
      virtual void FAIL(int k, ...);                                  // MR1
    int                 traceOptionValue;                           // MR10
    int                 traceGuessOptionValue;                      // MR10
    const ANTLRChar     *traceCurrentRuleName;                      // MR10
    int                 traceDepth;                                 // MR10
    void                traceReset();                               // MR10
    virtual void        traceGuessFail();                           // MR10
    virtual void        traceGuessDone(const ANTLRParserState *);   // MR10
    int                 zzGuessSeq;                                 // MR10

      ANTLRParser(ANTLRTokenBuffer *,
                        int k=1,
                        int use_inf_look=0,
                        int demand_look=0,
                        int bsetsize=1);
      virtual ~ANTLRParser();

      virtual void init();
      ANTLRTokenType LA(int i)
//  MR14 demand look will always be 0 for C++ mode
////  return demand_look ? token_type[(labase+(i)-1)&(LLk-1)] :
////                                token_type[(lap+(i)-1)&(LLk-1)];

// MR19 V.H. Simonis Defer fetch feature

        return token_type[(lap+(i)-1)&(LLk-1)];
      _ANTLRTokenPtr LT(int i);

      void setEofToken(ANTLRTokenType t)  { eofToken = t; }
      ANTLRTokenType getEofToken() const  { return eofToken; }    // MR14

      void noGarbageCollectTokens() { inputTokens->noGarbageCollectTokens(); }
      void garbageCollectTokens()         { inputTokens->garbageCollectTokens(); }

    virtual void syn(_ANTLRTokenPtr tok, ANTLRChar *egroup,
                               SetWordType *eset, ANTLRTokenType etok, int k);
      virtual void saveState(ANTLRParserState *);     // MR9 27-Sep-97 make virtual
      virtual void restoreState(ANTLRParserState *);  // MR9 27-Sep-97 make virtual

      virtual void panic(const char *msg); // MR20 const

      static char *eMsgd(char *,int);
      static char *eMsg(char *,char *);
      static char *eMsg2(char *,char *,char *);

      virtual int printMessage(FILE* pFile, const char* pFormat, ...); // MR23
      virtual int printMessageV(FILE* pFile, const char* pFormat, va_list arglist); // MR23

      void consumeUntil(SetWordType *st);
      void consumeUntilToken(int t);

      virtual int _setmatch_wdfltsig(SetWordType *tokensWanted,
                               ANTLRTokenType tokenTypeOfSet,
                               SetWordType *whatFollows);
      virtual int _match_wdfltsig(ANTLRTokenType tokenWanted,
                               SetWordType *whatFollows);
      const ANTLRChar * parserTokenName(int tok);                 // MR1

    int                 traceOptionValueDefault;        // MR11
    int                 traceOption(int delta);         // MR11
    int                 traceGuessOption(int delta);    // MR11

//  MR8  5-Aug-97   S.Bochnak@microtool.com.pl
//  MR8             Move resynch static local variable
//  MR8               to class instance

    int                 syntaxErrCount;                      // MR12
    ANTLRTokenStream   *getLexer() const {                   // MR12
      return inputTokens ? inputTokens->getLexer() : 0; }    // MR12
protected:                                              // MR8
    int     resynchConsumed;                            // MR8
    char    *zzFAILtext; // workarea required by zzFAIL // MR9
    void    undeferFetch();                             // MR19 V.H. Simonis
    int     isDeferFetchEnabled();                      // MR19 V.H. Simonis
    virtual void failedSemanticPredicate(const char* predicate); /* MR23 */

#define zzmatch(_t)                                         \
      if ( !_match((ANTLRTokenType)_t, &zzMissText, &zzMissTok, \
                         (_ANTLRTokenPtr *) &zzBadTok, &zzMissSet) ) goto fail;

#define zzmatch_wsig(_t,handler)                                  \
      if ( !_match_wsig((ANTLRTokenType)_t) ) if ( guessing ) zzGUESS_FAIL else {_signal=MismatchedToken; goto handler;}

#define zzsetmatch(_ts,_tokclassErrset)                                       \
      if ( !_setmatch(_ts, &zzMissText, &zzMissTok, \
                         (_ANTLRTokenPtr *) &zzBadTok, &zzMissSet, _tokclassErrset) ) goto fail;

#define zzsetmatch_wsig(_ts, handler)                       \
      if ( !_setmatch_wsig(_ts) ) if ( guessing ) zzGUESS_FAIL else {_signal=MismatchedToken; goto handler;}

/* For the dflt signal matchers, a FALSE indicates that an error occurred
 * just like the other matchers, but in this case, the routine has already
 * recovered--we do NOT want to consume another token.  However, when
 * the match was successful, we do want to consume hence _signal=0 so that
 * a token is consumed by the "if (!_signal) consume(); _signal=NoSignal;"
 * preamble.
#define zzsetmatch_wdfltsig(tokensWanted, tokenTypeOfSet, whatFollows) \
      if ( !_setmatch_wdfltsig(tokensWanted, tokenTypeOfSet, whatFollows) ) \
            _signal = MismatchedToken;

#define zzmatch_wdfltsig(tokenWanted, whatFollows) \
      if ( !_match_wdfltsig(tokenWanted, whatFollows) ) _signal = MismatchedToken;

//  MR1  10-Apr-97      zzfailed_pred() macro does not backtrack in guess mode.
//  MR1                     Identification and correction due to J. Lilley
//  MR23            Call virtual method to report error.
//  MR23            Provide more control over failed predicate action
//                  without any need for user to worry about guessing internals.

#ifndef zzfailed_pred
#define zzfailed_pred(_p,_hasuseraction,_useraction) \
  if (guessing) { \
    zzGUESS_FAIL; \
  } else { \
    zzfailed_pred_action(_p,_hasuseraction,_useraction) \

//  MR23            Provide more control over failed predicate action
//                  without any need for user to worry about guessing internals.
//                  _hasuseraction == 0 => no user specified error action
//                  _hasuseraction == 1 => user specified error action

#ifndef zzfailed_pred_action
#define zzfailed_pred_action(_p,_hasuseraction,_useraction) \
    if (_hasuseraction) { _useraction } else { failedSemanticPredicate(_p); }

#define zzRULE \
            SetWordType *zzMissSet=NULL; ANTLRTokenType zzMissTok=(ANTLRTokenType)0;      \
            _ANTLRTokenPtr zzBadTok=NULL; ANTLRChar *zzBadText=(ANTLRChar *)"";     \
            int zzErrk=1,zzpf=0; \
        zzTRACEdata \
            ANTLRChar *zzMissText=(ANTLRChar *)"";


        /* S t a n d a r d  E x c e p t i o n  S i g n a l s */

#define NoSignal              0
#define MismatchedToken       1
#define NoViableAlt                 2
#define NoSemViableAlt        3

/* MR7  Allow more control over signalling                                  */
/*        by adding "Unwind" and "SetSignal"                                */

#define Unwind              4
#define setSignal(newValue) *_retsignal=_signal=(newValue)
#define suppressSignal       *_retsignal=_signal=0
#define exportSignal        *_retsignal=_signal

Generated by  Doxygen 1.6.0   Back to index