gnu/abc-shell/lex.h

   1 /*
   2  * Source input, lexer and parser
   3  */
   4
   5 /* $Id$ */
   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     cmd_offset;     /* line number - command number */
  24         int     errline;        /* line the error occured on (0 if not set) */
  25         const char *file;       /* input file name */
  26         int     flags;          /* SF_* */
  27         Area    *areap;
  28         XString xs;             /* input buffer */
  29         Source *next;           /* stacked source */
  30 };
  31
  32 /* Source.type values */
  33 #define SEOF            0       /* input EOF */
  34 #define SFILE           1       /* file input */
  35 #define SSTDIN          2       /* read stdin */
  36 #define SSTRING         3       /* string */
  37 #define SWSTR           4       /* string without \n */
  38 #define SWORDS          5       /* string[] */
  39 #define SWORDSEP        6       /* string[] separator */
  40 #define SALIAS          7       /* alias expansion */
  41 #define SREREAD         8       /* read ahead to be re-scanned */
  42
  43 /* Source.flags values */
  44 #define SF_ECHO         BIT(0)  /* echo input to shlout */
  45 #define SF_ALIAS        BIT(1)  /* faking space at end of alias */
  46 #define SF_ALIASEND     BIT(2)  /* faking space at end of alias */
  47 #define SF_TTY          BIT(3)  /* type == SSTDIN & it is a tty */
  48
  49 /*
  50  * states while lexing word
  51  */
  52 #define SBASE   0               /* outside any lexical constructs */
  53 #define SWORD   1               /* implicit quoting for substitute() */
  54 #define SLETPAREN 2             /* inside (( )), implicit quoting */
  55 #define SSQUOTE 3               /* inside '' */
  56 #define SDQUOTE 4               /* inside "" */
  57 #define SBRACE  5               /* inside ${} */
  58 #define SCSPAREN 6              /* inside $() */
  59 #define SBQUOTE 7               /* inside `` */
  60 #define SASPAREN 8              /* inside $(( )) */
  61 #define SHEREDELIM 9            /* parsing <<,<<- delimiter */
  62 #define SHEREDQUOTE 10          /* parsing " in <<,<<- delimiter */
  63 #define SPATTERN 11             /* parsing *(...|...) pattern (*+?@!) */
  64 #define STBRACE 12              /* parsing ${..[#%]..} */
  65
  66 typedef union {
  67         int     i;
  68         char   *cp;
  69         char  **wp;
  70         struct op *o;
  71         struct ioword *iop;
  72 } YYSTYPE;
  73
  74 /* If something is added here, add it to tokentab[] in syn.c as well */
  75 #define LWORD   256
  76 #define LOGAND  257             /* && */
  77 #define LOGOR   258             /* || */
  78 #define BREAK   259             /* ;; */
  79 #define IF      260
  80 #define THEN    261
  81 #define ELSE    262
  82 #define ELIF    263
  83 #define FI      264
  84 #define CASE    265
  85 #define ESAC    266
  86 #define FOR     267
  87 #define SELECT  268
  88 #define WHILE   269
  89 #define UNTIL   270
  90 #define DO      271
  91 #define DONE    272
  92 #define IN      273
  93 #define FUNCTION 274
  94 #define TIME    275
  95 #define REDIR   276
  96 #define MDPAREN 277             /* (( )) */
  97 #define BANG    278             /* ! */
  98 #define DBRACKET 279            /* [[ .. ]] */
  99 #define COPROC  280             /* |& */
 100 #define YYERRCODE 300
 101
 102 /* flags to yylex */
 103 #define CONTIN  BIT(0)          /* skip new lines to complete command */
 104 #define ONEWORD BIT(1)          /* single word for substitute() */
 105 #define ALIAS   BIT(2)          /* recognize alias */
 106 #define KEYWORD BIT(3)          /* recognize keywords */
 107 #define LETEXPR BIT(4)          /* get expression inside (( )) */
 108 #define VARASN  BIT(5)          /* check for var=word */
 109 #define ARRAYVAR BIT(6)         /* parse x[1 & 2] as one word */
 110 #define ESACONLY BIT(7)         /* only accept esac keyword */
 111 #define CMDWORD BIT(8)          /* parsing simple command (alias related) */
 112 #define HEREDELIM BIT(9)        /* parsing <<,<<- delimiter */
 113 #define HEREDOC BIT(10)         /* parsing heredoc */
 114
 115 #define HERES   10              /* max << in line */
 116
 117 EXTERN  Source *source;         /* yyparse/yylex source */
 118 EXTERN  YYSTYPE yylval;         /* result from yylex */
 119 EXTERN  struct ioword *heres [HERES], **herep;
 120 EXTERN  char    ident [IDENT+1];
 121
 122 #ifdef HISTORY
 123 # define HISTORYSIZE    500     /* size of saved history */
 124
 125 EXTERN  char  **history;        /* saved commands */
 126 EXTERN  char  **histptr;        /* last history item */
 127 EXTERN  int     histsize;       /* history size */
 128 #endif /* HISTORY */