lex.h

   1 /*
   2  * Source input, lexer and parser
   3  */
   4
   5 /* $Id: lex.h,v 1.4 1994/05/31 13:34:34 michael Exp $ */
   6
   7 #define IDENT   64
   8
   9 typedef struct source Source;
  10 struct source {
  11         const char *str;        /* input pointer */
  12         int     type;           /* input type */
  13         const char *start;      /* start of current buffer */
  14         union {
  15                 char **strv;    /* string [] */
  16                 struct shf *shf; /* shell file */
  17                 struct tbl *tblp; /* alias (SALIAS) */
  18                 char *freeme;   /* also for SREREAD */
  19         } u;
  20         char    ugbuf[2];       /* buffer for ungetsc() (SREREAD) and
  21                                  * alias (SALIAS) */
  22         int     line;           /* line number */
  23         int     errline;        /* line the error occured on (0 if not set) */
  24         const char *file;       /* input file name */
  25         int     flags;          /* SF_* */
  26         Area    *areap;
  27         XString xs;             /* input buffer */
  28         Source *next;           /* stacked source */
  29 };
  30
  31 /* Source.type values */
  32 #define SEOF            0       /* input EOF */
  33 #define SFILE           1       /* file input */
  34 #define SSTDIN          2       /* read stdin */
  35 #define SSTRING         3       /* string */
  36 #define SWSTR           4       /* string without \n */
  37 #define SWORDS          5       /* string[] */
  38 #define SWORDSEP        6       /* string[] seperator */
  39 #define SALIAS          7       /* alias expansion */
  40 #define SREREAD         8       /* read ahead to be re-scanned */
  41
  42 /* Source.flags values */
  43 #define SF_ECHO         BIT(0)  /* echo input to shlout */
  44 #define SF_ALIAS        BIT(1)  /* faking space at end of alias */
  45 #define SF_ALIASEND     BIT(2)  /* faking space at end of alias */
  46 #define SF_TTY          BIT(3)  /* type == SSTDIN & it is a tty */
  47 #define SF_FIRST        BIT(4)  /* initial state (to ignore UTF-8 BOM) */
  48
  49 typedef union {
  50         int     i;
  51         char   *cp;
  52         char  **wp;
  53         struct op *o;
  54         struct ioword *iop;
  55 } YYSTYPE;
  56
  57 /* If something is added here, add it to tokentab[] in syn.c as well */
  58 #define LWORD   256
  59 #define LOGAND  257             /* && */
  60 #define LOGOR   258             /* || */
  61 #define BREAK   259             /* ;; */
  62 #define IF      260
  63 #define THEN    261
  64 #define ELSE    262
  65 #define ELIF    263
  66 #define FI      264
  67 #define CASE    265
  68 #define ESAC    266
  69 #define FOR     267
  70 #define SELECT  268
  71 #define WHILE   269
  72 #define UNTIL   270
  73 #define DO      271
  74 #define DONE    272
  75 #define IN      273
  76 #define FUNCTION 274
  77 #define TIME    275
  78 #define REDIR   276
  79 #ifdef KSH
  80 #define MDPAREN 277             /* (( )) */
  81 #endif /* KSH */
  82 #define BANG    278             /* ! */
  83 #define DBRACKET 279            /* [[ .. ]] */
  84 #define COPROC  280             /* |& */
  85 #define YYERRCODE 300
  86
  87 /* flags to yylex */
  88 #define CONTIN  BIT(0)          /* skip new lines to complete command */
  89 #define ONEWORD BIT(1)          /* single word for substitute() */
  90 #define ALIAS   BIT(2)          /* recognize alias */
  91 #define KEYWORD BIT(3)          /* recognize keywords */
  92 #define LETEXPR BIT(4)          /* get expression inside (( )) */
  93 #define VARASN  BIT(5)          /* check for var=word */
  94 #define ARRAYVAR BIT(6)         /* parse x[1 & 2] as one word */
  95 #define ESACONLY BIT(7)         /* only accept esac keyword */
  96 #define CMDWORD BIT(8)          /* parsing simple command (alias related) */
  97 #define HEREDELIM BIT(9)        /* parsing <<,<<- delimiter */
  98 #define HEREDOC BIT(10)         /* parsing heredoc */
  99
 100 #define HERES   10              /* max << in line */
 101
 102 EXTERN  Source *source;         /* yyparse/yylex source */
 103 EXTERN  YYSTYPE yylval;         /* result from yylex */
 104 EXTERN  struct ioword *heres [HERES], **herep;
 105 EXTERN  char    ident [IDENT+1];
 106
 107 #ifdef HISTORY
 108 # define HISTORYSIZE    128     /* size of saved history */
 109
 110 EXTERN  char  **history;        /* saved commands */
 111 EXTERN  char  **histptr;        /* last history item */
 112 EXTERN  int     histsize;       /* history size */
 113 #endif /* HISTORY */