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/* parser.h -- Everything you wanted to know about the parser, but were
afraid to ask. */
/* Copyright (C) 1995-2024 Free Software Foundation, Inc.
This file is part of GNU Bash, the Bourne Again SHell.
Bash is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Bash is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Bash. If not, see <http://www.gnu.org/licenses/>.
*/
#if !defined (_PARSER_H_)
# define _PARSER_H_
# include "command.h"
# include "input.h"
/* Possible states for the parser that require it to do special things. */
#define PST_CASEPAT 0x000001 /* in a case pattern list */
#define PST_ALEXPNEXT 0x000002 /* expand next word for aliases */
#define PST_ALLOWOPNBRC 0x000004 /* allow open brace for function def */
#define PST_NEEDCLOSBRC 0x000008 /* need close brace -- unused */
#define PST_DBLPAREN 0x000010 /* double-paren parsing - unused */
#define PST_SUBSHELL 0x000020 /* ( ... ) subshell */
#define PST_CMDSUBST 0x000040 /* $( ... ) command substitution */
#define PST_CASESTMT 0x000080 /* parsing a case statement */
#define PST_CONDCMD 0x000100 /* parsing a [[...]] command */
#define PST_CONDEXPR 0x000200 /* parsing the guts of [[...]] */
#define PST_ARITHFOR 0x000400 /* parsing an arithmetic for command - unused */
#define PST_ALEXPAND 0x000800 /* OK to expand aliases - unused */
#define PST_EXTPAT 0x001000 /* parsing an extended shell pattern */
#define PST_COMPASSIGN 0x002000 /* parsing x=(...) compound assignment */
#define PST_ASSIGNOK 0x004000 /* assignment statement ok in this context */
#define PST_EOFTOKEN 0x008000 /* yylex checks against shell_eof_token */
#define PST_REGEXP 0x010000 /* parsing an ERE/BRE as a single word */
#define PST_HEREDOC 0x020000 /* reading body of here-document */
#define PST_REPARSE 0x040000 /* re-parsing in parse_string_to_word_list */
#define PST_REDIRLIST 0x080000 /* parsing a list of redirections preceding a simple command name */
#define PST_COMMENT 0x100000 /* parsing a shell comment; used by aliases */
#define PST_ENDALIAS 0x200000 /* just finished expanding and consuming an alias */
#define PST_NOEXPAND 0x400000 /* don't expand anything in read_token_word; for command substitution */
#define PST_NOERROR 0x800000 /* don't print error messages in yyerror */
#define PST_STRING 0x1000000 /* parsing a string to a command or word list */
#define PST_CMDBLTIN 0x2000000 /* last token was the `command' builtin */
#define PST_FUNSUBST 0x4000000 /* parsing a foreground command substitution */
#define PST_FORCMD 0x8000000 /* parsing for command -- not used yet */
/* Definition of the delimiter stack. Needed by parse.y and bashhist.c. */
struct dstack {
/* DELIMITERS is a stack of the nested delimiters that we have
encountered so far. */
char *delimiters;
/* Offset into the stack of delimiters. */
int delimiter_depth;
/* How many slots are allocated to DELIMITERS. */
int delimiter_space;
};
/* States we can be in while scanning a ${...} expansion. Shared between
parse.y and subst.c */
#define DOLBRACE_PARAM 0x01
#define DOLBRACE_OP 0x02
#define DOLBRACE_WORD 0x04
#define DOLBRACE_QUOTE 0x40 /* single quote is special in double quotes */
#define DOLBRACE_QUOTE2 0x80 /* single quote is semi-special in double quotes */
/* characters that can appear following ${ to introduce a nofork command
substitution. */
#if 0
#define FUNSUB_CHAR(n) ((n) == ' ' || (n) == '\t' || (n) == '\n' || (n) == '|' || (n) == '(') /* ) */
#else
#define FUNSUB_CHAR(n) ((n) == ' ' || (n) == '\t' || (n) == '\n' || (n) == '|')
#endif
/* variable declarations from parse.y */
extern struct dstack dstack;
extern char *primary_prompt;
extern char *secondary_prompt;
extern char *current_prompt_string;
extern char *ps1_prompt;
extern char *ps2_prompt;
extern char *ps0_prompt;
extern int expand_aliases;
extern int current_command_line_count;
extern int saved_command_line_count;
extern int shell_eof_token;
extern int current_token;
extern int parser_state;
extern int need_here_doc;
extern int heredoc_string;
extern int ignoreeof;
extern int eof_encountered;
extern int eof_encountered_limit;
extern int line_number, line_number_base;
#endif /* _PARSER_H_ */
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