parser.h

   1 /* parser.h -- Everything you wanted to know about the parser, but were
   2    afraid to ask. */
   3
   4 /* Copyright (C) 1995-2010 Free Software Foundation, Inc.
   5
   6    This file is part of GNU Bash, the Bourne Again SHell.
   7
   8    Bash is free software: you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation, either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    Bash is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  20 */
  21
  22 #if !defined (_PARSER_H_)
  23 #  define _PARSER_H_
  24
  25 #  include "command.h"
  26 #  include "input.h"
  27
  28 /* Possible states for the parser that require it to do special things. */
  29 #define PST_CASEPAT     0x000001        /* in a case pattern list */
  30 #define PST_ALEXPNEXT   0x000002        /* expand next word for aliases */
  31 #define PST_ALLOWOPNBRC 0x000004        /* allow open brace for function def */
  32 #define PST_NEEDCLOSBRC 0x000008        /* need close brace */
  33 #define PST_DBLPAREN    0x000010        /* double-paren parsing */
  34 #define PST_SUBSHELL    0x000020        /* ( ... ) subshell */
  35 #define PST_CMDSUBST    0x000040        /* $( ... ) command substitution */
  36 #define PST_CASESTMT    0x000080        /* parsing a case statement */
  37 #define PST_CONDCMD     0x000100        /* parsing a [[...]] command */
  38 #define PST_CONDEXPR    0x000200        /* parsing the guts of [[...]] */
  39 #define PST_ARITHFOR    0x000400        /* parsing an arithmetic for command - unused */
  40 #define PST_ALEXPAND    0x000800        /* OK to expand aliases - unused */
  41 #define PST_EXTPAT      0x001000        /* parsing an extended shell pattern */
  42 #define PST_COMPASSIGN  0x002000        /* parsing x=(...) compound assignment */
  43 #define PST_ASSIGNOK    0x004000        /* assignment statement ok in this context */
  44 #define PST_EOFTOKEN    0x008000        /* yylex checks against shell_eof_token */
  45 #define PST_REGEXP      0x010000        /* parsing an ERE/BRE as a single word */
  46 #define PST_HEREDOC     0x020000        /* reading body of here-document */
  47 #define PST_REPARSE     0x040000        /* re-parsing in parse_string_to_word_list */
  48 #define PST_REDIRLIST   0x080000        /* parsing a list of redirections preceding a simple command name */
  49
  50
  51 /* Definition of the delimiter stack.  Needed by parse.y and bashhist.c. */
  52 struct dstack {
  53 /* DELIMITERS is a stack of the nested delimiters that we have
  54    encountered so far. */
  55   char *delimiters;
  56
  57 /* Offset into the stack of delimiters. */
  58   int delimiter_depth;
  59
  60 /* How many slots are allocated to DELIMITERS. */
  61   int delimiter_space;
  62 };
  63
  64 /* States we can be in while scanning a ${...} expansion.  Shared between
  65    parse.y and subst.c */
  66 #define DOLBRACE_PARAM  0x01
  67 #define DOLBRACE_OP     0x02
  68 #define DOLBRACE_WORD   0x04
  69
  70 #define DOLBRACE_QUOTE  0x40    /* single quote is special in double quotes */
  71 #define DOLBRACE_QUOTE2 0x80    /* single quote is semi-special in double quotes */
  72
  73 #endif /* _PARSER_H_ */