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+/* parser.h -- Everything you wanted to know about the parser, but were
+ afraid to ask. */
+
+/* Copyright (C) 1995-2021 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 */
+#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 */
+
+/* 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 */
+
+/* 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 ignoreeof;
+extern int eof_encountered;
+extern int eof_encountered_limit;
+
+extern int line_number, line_number_base;
+
+#endif /* _PARSER_H_ */