scan.h

   1 /*
   2  * Copyright 1993, 1995 Christopher Seiwald.
   3  *
   4  * This file is part of Jam - see jam.c for Copyright information.
   5  */
   6
   7 /*
   8  * scan.h - the jam yacc scanner
   9  *
  10  * External functions:
  11  *
  12  *  yyerror( char *s ) - print a parsing error message
  13  *  yyfparse( char *s ) - scan include file s
  14  *  yylex() - parse the next token, returning its type
  15  *  yymode() - adjust lexicon of scanner
  16  *  yyparse() - declaration for yacc parser
  17  *  yyanyerrors() - indicate if any parsing errors occured
  18  *
  19  * The yymode() function is for the parser to adjust the lexicon of the
  20  * scanner.  Aside from normal keyword scanning, there is a mode to
  21  * handle action strings (look only for the closing }) and a mode to
  22  * ignore most keywords when looking for a punctuation keyword.  This
  23  * allows non-punctuation keywords to be used in lists without quoting.
  24  *
  25  * 11/04/02 (seiwald) - const-ing for string literals
  26  */
  27
  28 /*
  29  * YYSTYPE - value of a lexical token
  30  */
  31
  32 # define YYSTYPE YYSYMBOL
  33
  34 typedef struct _YYSTYPE {
  35   int type;
  36   const char *string;
  37   PARSE *parse;
  38   LIST *list;
  39   int number;
  40 } YYSTYPE;
  41
  42 extern YYSTYPE yylval;
  43
  44 void yymode (int n);
  45 void yyerror (const char *s);
  46 int yyanyerrors (void);
  47 void yyfparse (const char *s);
  48 int yyline (void);
  49 int yylex (void);
  50 int yyparse (void);
  51
  52 # define SCAN_NORMAL  0 /* normal parsing */
  53 # define SCAN_STRING  1 /* look only for matching } */
  54 # define SCAN_PUNCT 2 /* only punctuation keywords */