text: /*
    Expression Evaluator Library (NS-EEL)
    Copyright (C) 2004-2008 Cockos Incorporated
    Copyright (C) 1999-2003 Nullsoft, Inc.
    
    nseel-yylex.c
  
    This software is provided 'as-is', without any express or implied
    warranty.  In no event will the authors be held liable for any damages
    arising from the use of this software.
  
    Permission is granted to anyone to use this software for any purpose,
    including commercial applications, and to alter it and redistribute it
    freely, subject to the following restrictions:
  
    1. The origin of this software must not be misrepresented; you must not
       claim that you wrote the original software. If you use this software
       in a product, an acknowledgment in the product documentation would be
       appreciated but is not required.
    2. Altered source versions must be plainly marked as such, and must not be
       misrepresented as being the original software.
    3. This notice may not be removed or altered from any source distribution.
  */
  
  
  #include "script-yycontext.h"
  
  namespace Script { namespace mdpx {
  
  #define NBPW		 16
  #define EOF			(-1)
  
  
  #define YYERRORVAL   256     /* yacc's value */
  
  static int llset(yycontext *ctx);
  static int llinp(yycontext *ctx, const char **exp);
  static int lexgetc(const char **exp)
  {
    char c= **exp;
    if (c) (*exp)++;
    return( c != 0 ? c : -1);
  }
  static int tst__b(int c, const char tab[])
  {
    return (tab[(c >> 3) & 037] & (1 << (c & 07)) );
  }
  
  int nseel_gettoken(yycontext *ctx, char *lltb, int lltbsiz)
  {
          char *lp, *tp, *ep;
  
          tp = lltb;
          ep = tp+lltbsiz-1;
          for (lp = ctx->llbuf; lp < ctx->llend && tp < ep;)
                  *tp++ = *lp++;
          *tp = 0;
          return (int)(tp-lltb);
  }
  
  
  int nseel_yylex(yycontext *ctx, const char **exp)
  {
    int c, st;
    int final, l, llk, i;
    const lextab *lp;
    const char *cp;
  
    while (1)
    {
      llk = 0;
      if (llset(ctx)) return(0);
      st = 0;
      final = -1;
      lp = ctx->yylextab;
  
      do {
              if (lp->lllook && (l = lp->lllook[st])) {
                      for (c=0; c<NBPW; c++)
                              if (l&(1<<c))
                                      ctx->llsave[c] = ctx->llp1;
                      llk++;
              }
              if ((i = lp->llfinal[st]) != -1) {
                      final = i;
                      ctx->llend = ctx->llp1;
              }
              if ((c = llinp(ctx,exp)) < 0)
                      break;
              if ((cp = lp->llbrk) && llk==0 && tst__b(c, cp)) {
                      ctx->llp1--;
                      break;
              }
      } while ((st = (*lp->llmove)(lp, c, st)) != -1);
  
  
      if (ctx->llp2 < ctx->llp1)
              ctx->llp2 = ctx->llp1;
      if (final == -1) {
              ctx->llend = ctx->llp1;
              if (st == 0 && c < 0)
                      return(0);
              if ((cp = lp->llill) && tst__b(c, cp)) {
                      continue;
              }
              return(YYERRORVAL);
      }
      if ((c = (final >> 11) & 037))
              ctx->llend = ctx->llsave[c-1];
      if ((c = (*lp->llactr)(ctx,final&03777)) >= 0)
              return(c);
    }
  }
  
  void nseel_llinit(yycontext *ctx)
  {
     ctx->llp1 = ctx->llp2 = ctx->llend = ctx->llbuf;
     ctx->llebuf = ctx->llbuf + sizeof(ctx->llbuf);
     ctx->lleof = ctx->yyline = 0;
  }
  
  
  static int llinp(yycontext *ctx, const char **exp)
  {
          int c;
          const lextab *lp;
          const char *cp;
  
          lp = ctx->yylextab;
          cp = lp->llign;                         /* Ignore class         */
          for (;;) {
                  /*
                   * Get the next character from the save buffer (if possible)
                   * If the save buffer's empty, then return EOF or the next
                   * input character.  Ignore the character if it's in the
                   * ignore class.
                   */
                  c = (ctx->llp1 < ctx->llp2) ? *ctx->llp1 & 0377 : (ctx->lleof) ? EOF : lexgetc(exp);
                  if (c >= 0) {                   /* Got a character?     */
                          if (cp && tst__b(c, cp))
                                  continue;       /* Ignore it            */
                          if (ctx->llp1 >= ctx->llebuf) {   /* No, is there room?   */
                                  return -1;
                          }
                          *ctx->llp1++ = c;            /* Store in token buff  */
                  } else
                          ctx->lleof = 1;              /* Set EOF signal       */
                  return(c);
          }
  }
  
  static int llset(yycontext *ctx)
  /*
   * Return TRUE if EOF and nothing was moved in the look-ahead buffer
   */
  {
          char *lp1, *lp2;
  
          for (lp1 = ctx->llbuf, lp2 = ctx->llend; lp2 < ctx->llp2;)
                  *lp1++ = *lp2++;
          ctx->llend = ctx->llp1 = ctx->llbuf;
          ctx->llp2 = lp1;
          return(ctx->lleof && lp1 == ctx->llbuf);
  }
  
  }}
  