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parse.y
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parse.y
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/* parse.y - Yacc grammar for bash. */
/* Copyright (C) 1989-2022 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/>.
*/
%{
#include "config.h"
#include "bashtypes.h"
#include "bashansi.h"
#include "filecntl.h"
#if defined (HAVE_UNISTD_H)
# include <unistd.h>
#endif
#if defined (HAVE_LOCALE_H)
# include <locale.h>
#endif
#include <stdio.h>
#include "chartypes.h"
#include <signal.h>
#include "memalloc.h"
#include "bashintl.h"
#define NEED_STRFTIME_DECL /* used in externs.h */
#include "shell.h"
#include "execute_cmd.h"
#include "typemax.h" /* SIZE_MAX if needed */
#include "trap.h"
#include "flags.h"
#include "parser.h"
#include "mailcheck.h"
#include "test.h"
#include "builtins.h"
#include "builtins/common.h"
#include "builtins/builtext.h"
#include "shmbutil.h"
#if defined (READLINE)
# include "bashline.h"
# include <readline/readline.h>
#endif /* READLINE */
#if defined (HISTORY)
# include "bashhist.h"
# include <readline/history.h>
#endif /* HISTORY */
#if defined (JOB_CONTROL)
# include "jobs.h"
#else
extern int cleanup_dead_jobs PARAMS((void));
#endif /* JOB_CONTROL */
#if defined (ALIAS)
# include "alias.h"
#else
typedef void *alias_t;
#endif /* ALIAS */
#if defined (PROMPT_STRING_DECODE)
# ifndef _MINIX
# include <sys/param.h>
# endif
# include <time.h>
# if defined (TM_IN_SYS_TIME)
# include <sys/types.h>
# include <sys/time.h>
# endif /* TM_IN_SYS_TIME */
# include "maxpath.h"
#endif /* PROMPT_STRING_DECODE */
#define RE_READ_TOKEN -99
#define NO_EXPANSION -100
#define END_ALIAS -2
#ifdef DEBUG
# define YYDEBUG 1
#else
# define YYDEBUG 0
#endif
#if defined (HANDLE_MULTIBYTE)
# define last_shell_getc_is_singlebyte \
((shell_input_line_index > 1) \
? shell_input_line_property[shell_input_line_index - 1] \
: 1)
# define MBTEST(x) ((x) && last_shell_getc_is_singlebyte)
#else
# define last_shell_getc_is_singlebyte 1
# define MBTEST(x) ((x))
#endif
#define EXTEND_SHELL_INPUT_LINE_PROPERTY() \
do { \
if (shell_input_line_len + 2 > shell_input_line_propsize) \
{ \
shell_input_line_propsize = shell_input_line_len + 2; \
shell_input_line_property = (char *)xrealloc (shell_input_line_property, \
shell_input_line_propsize); \
} \
} while (0)
#if defined (EXTENDED_GLOB)
extern int extended_glob, extglob_flag;
#endif
#if defined (TRANSLATABLE_STRINGS)
extern int dump_translatable_strings, dump_po_strings;
extern int singlequote_translations;
#endif /* TRANSLATABLE_STRINGS */
#if !defined (errno)
extern int errno;
#endif
/* **************************************************************** */
/* */
/* "Forward" declarations */
/* */
/* **************************************************************** */
#ifdef DEBUG
static void debug_parser PARAMS((int));
#endif
static int yy_getc PARAMS((void));
static int yy_ungetc PARAMS((int));
#if defined (READLINE)
static int yy_readline_get PARAMS((void));
static int yy_readline_unget PARAMS((int));
#endif
static int yy_string_get PARAMS((void));
static int yy_string_unget PARAMS((int));
static int yy_stream_get PARAMS((void));
static int yy_stream_unget PARAMS((int));
static int shell_getc PARAMS((int));
static void shell_ungetc PARAMS((int));
static void discard_until PARAMS((int));
static void push_string PARAMS((char *, int, alias_t *));
static void pop_string PARAMS((void));
static void free_string_list PARAMS((void));
static char *read_a_line PARAMS((int));
static int reserved_word_acceptable PARAMS((int));
static int yylex PARAMS((void));
static void push_heredoc PARAMS((REDIRECT *));
static char *mk_alexpansion PARAMS((char *));
static int alias_expand_token PARAMS((char *));
static int time_command_acceptable PARAMS((void));
static int special_case_tokens PARAMS((char *));
static int read_token PARAMS((int));
static char *parse_matched_pair PARAMS((int, int, int, int *, int));
static char *parse_comsub PARAMS((int, int, int, int *, int));
#if defined (ARRAY_VARS)
static char *parse_compound_assignment PARAMS((int *));
#endif
#if defined (DPAREN_ARITHMETIC) || defined (ARITH_FOR_COMMAND)
static int parse_dparen PARAMS((int));
static int parse_arith_cmd PARAMS((char **, int));
#endif
#if defined (COND_COMMAND)
static void cond_error PARAMS((void));
static COND_COM *cond_expr PARAMS((void));
static COND_COM *cond_or PARAMS((void));
static COND_COM *cond_and PARAMS((void));
static COND_COM *cond_term PARAMS((void));
static int cond_skip_newlines PARAMS((void));
static COMMAND *parse_cond_command PARAMS((void));
#endif
#if defined (ARRAY_VARS)
static int token_is_assignment PARAMS((char *, int));
static int token_is_ident PARAMS((char *, int));
#endif
static int read_token_word PARAMS((int));
static void discard_parser_constructs PARAMS((int));
static char *error_token_from_token PARAMS((int));
static char *error_token_from_text PARAMS((void));
static void print_offending_line PARAMS((void));
static void report_syntax_error PARAMS((char *));
static void handle_eof_input_unit PARAMS((void));
static void prompt_again PARAMS((int));
#if 0
static void reset_readline_prompt PARAMS((void));
#endif
static void print_prompt PARAMS((void));
#if defined (HANDLE_MULTIBYTE)
static void set_line_mbstate PARAMS((void));
static char *shell_input_line_property = NULL;
static size_t shell_input_line_propsize = 0;
#else
# define set_line_mbstate()
#endif
extern int yyerror PARAMS((const char *));
#ifdef DEBUG
extern int yydebug;
#endif
/* Default prompt strings */
char *primary_prompt = PPROMPT;
char *secondary_prompt = SPROMPT;
/* PROMPT_STRING_POINTER points to one of these, never to an actual string. */
char *ps1_prompt, *ps2_prompt;
/* Displayed after reading a command but before executing it in an interactive shell */
char *ps0_prompt;
/* Handle on the current prompt string. Indirectly points through
ps1_ or ps2_prompt. */
char **prompt_string_pointer = (char **)NULL;
char *current_prompt_string;
/* Non-zero means we expand aliases in commands. */
int expand_aliases = 0;
/* If non-zero, the decoded prompt string undergoes parameter and
variable substitution, command substitution, arithmetic substitution,
string expansion, process substitution, and quote removal in
decode_prompt_string. */
int promptvars = 1;
/* If non-zero, $'...' and $"..." are expanded when they appear within
a ${...} expansion, even when the expansion appears within double
quotes. */
int extended_quote = 1;
/* The number of lines read from input while creating the current command. */
int current_command_line_count;
/* The number of lines in a command saved while we run parse_and_execute */
int saved_command_line_count;
/* The token that currently denotes the end of parse. */
int shell_eof_token;
/* The token currently being read. */
int current_token;
/* The current parser state. */
int parser_state;
/* Variables to manage the task of reading here documents, because we need to
defer the reading until after a complete command has been collected. */
static REDIRECT *redir_stack[HEREDOC_MAX];
int need_here_doc;
/* Where shell input comes from. History expansion is performed on each
line when the shell is interactive. */
static char *shell_input_line = (char *)NULL;
static size_t shell_input_line_index;
static size_t shell_input_line_size; /* Amount allocated for shell_input_line. */
static size_t shell_input_line_len; /* strlen (shell_input_line) */
/* Either zero or EOF. */
static int shell_input_line_terminator;
/* The line number in a script on which a function definition starts. */
static int function_dstart;
/* The line number in a script on which a function body starts. */
static int function_bstart;
/* The line number in a script at which an arithmetic for command starts. */
static int arith_for_lineno;
/* The decoded prompt string. Used if READLINE is not defined or if
editing is turned off. Analogous to current_readline_prompt. */
static char *current_decoded_prompt;
/* The last read token, or NULL. read_token () uses this for context
checking. */
static int last_read_token;
/* The token read prior to last_read_token. */
static int token_before_that;
/* The token read prior to token_before_that. */
static int two_tokens_ago;
static int global_extglob;
/* The line number in a script where the word in a `case WORD', `select WORD'
or `for WORD' begins. This is a nested command maximum, since the array
index is decremented after a case, select, or for command is parsed. */
#define MAX_CASE_NEST 128
static int word_lineno[MAX_CASE_NEST+1];
static int word_top = -1;
/* If non-zero, it is the token that we want read_token to return
regardless of what text is (or isn't) present to be read. This
is reset by read_token. If token_to_read == WORD or
ASSIGNMENT_WORD, yylval.word should be set to word_desc_to_read. */
static int token_to_read;
static WORD_DESC *word_desc_to_read;
static REDIRECTEE source;
static REDIRECTEE redir;
static FILE *yyoutstream;
static FILE *yyerrstream;
%}
%union {
WORD_DESC *word; /* the word that we read. */
int number; /* the number that we read. */
WORD_LIST *word_list;
COMMAND *command;
REDIRECT *redirect;
ELEMENT element;
PATTERN_LIST *pattern;
}
/* Reserved words. Members of the first group are only recognized
in the case that they are preceded by a list_terminator. Members
of the second group are for [[...]] commands. Members of the
third group are recognized only under special circumstances. */
%token IF THEN ELSE ELIF FI CASE ESAC FOR SELECT WHILE UNTIL DO DONE FUNCTION COPROC
%token COND_START COND_END COND_ERROR
%token IN BANG TIME TIMEOPT TIMEIGN
/* More general tokens. yylex () knows how to make these. */
%token <word> WORD ASSIGNMENT_WORD REDIR_WORD
%token <number> NUMBER
%token <word_list> ARITH_CMD ARITH_FOR_EXPRS
%token <command> COND_CMD
%token AND_AND OR_OR GREATER_GREATER LESS_LESS LESS_AND LESS_LESS_LESS
%token GREATER_AND SEMI_SEMI SEMI_AND SEMI_SEMI_AND
%token LESS_LESS_MINUS AND_GREATER AND_GREATER_GREATER LESS_GREATER
%token GREATER_BAR BAR_AND
/* Special; never created by yylex; only set by parse_comsub and xparse_dolparen */
%token DOLPAREN
/* The types that the various syntactical units return. */
%type <command> inputunit command pipeline pipeline_command
%type <command> list0 list1 compound_list simple_list simple_list1
%type <command> simple_command shell_command
%type <command> for_command select_command case_command group_command
%type <command> arith_command
%type <command> cond_command
%type <command> arith_for_command
%type <command> coproc
%type <command> comsub
%type <command> function_def function_body if_command elif_clause subshell
%type <redirect> redirection redirection_list
%type <element> simple_command_element
%type <word_list> word_list pattern
%type <pattern> pattern_list case_clause_sequence case_clause
%type <number> timespec
%type <number> list_terminator
%start inputunit
%left '&' ';' '\n' yacc_EOF
%left AND_AND OR_OR
%right '|' BAR_AND
%%
inputunit: simple_list simple_list_terminator
{
/* Case of regular command. Discard the error
safety net,and return the command just parsed. */
global_command = $1;
eof_encountered = 0;
/* discard_parser_constructs (0); */
if (parser_state & PST_CMDSUBST)
parser_state |= PST_EOFTOKEN;
YYACCEPT;
}
| comsub
{
/* This is special; look at the production and how
parse_comsub sets token_to_read */
global_command = $1;
eof_encountered = 0;
YYACCEPT;
}
| '\n'
{
/* Case of regular command, but not a very
interesting one. Return a NULL command. */
global_command = (COMMAND *)NULL;
if (parser_state & PST_CMDSUBST)
parser_state |= PST_EOFTOKEN;
YYACCEPT;
}
| error '\n'
{
/* Error during parsing. Return NULL command. */
global_command = (COMMAND *)NULL;
eof_encountered = 0;
/* discard_parser_constructs (1); */
if (interactive && parse_and_execute_level == 0)
{
YYACCEPT;
}
else
{
YYABORT;
}
}
| error yacc_EOF
{
/* EOF after an error. Do ignoreeof or not. Really
only interesting in non-interactive shells */
global_command = (COMMAND *)NULL;
if (last_command_exit_value == 0)
last_command_exit_value = EX_BADUSAGE; /* force error return */
if (interactive && parse_and_execute_level == 0)
{
handle_eof_input_unit ();
YYACCEPT;
}
else
{
YYABORT;
}
}
| error YYEOF
{
global_command = (COMMAND *)NULL;
if (last_command_exit_value == 0)
last_command_exit_value = EX_BADUSAGE; /* force error return */
if (interactive && parse_and_execute_level == 0)
{
handle_eof_input_unit ();
YYACCEPT;
}
else
{
YYABORT;
}
}
| yacc_EOF
{
/* Case of EOF seen by itself. Do ignoreeof or
not. */
global_command = (COMMAND *)NULL;
handle_eof_input_unit ();
YYACCEPT;
}
;
word_list: WORD
{ $$ = make_word_list ($1, (WORD_LIST *)NULL); }
| word_list WORD
{ $$ = make_word_list ($2, $1); }
;
redirection: '>' WORD
{
source.dest = 1;
redir.filename = $2;
$$ = make_redirection (source, r_output_direction, redir, 0);
}
| '<' WORD
{
source.dest = 0;
redir.filename = $2;
$$ = make_redirection (source, r_input_direction, redir, 0);
}
| NUMBER '>' WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_output_direction, redir, 0);
}
| NUMBER '<' WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_input_direction, redir, 0);
}
| REDIR_WORD '>' WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_output_direction, redir, REDIR_VARASSIGN);
}
| REDIR_WORD '<' WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_input_direction, redir, REDIR_VARASSIGN);
}
| GREATER_GREATER WORD
{
source.dest = 1;
redir.filename = $2;
$$ = make_redirection (source, r_appending_to, redir, 0);
}
| NUMBER GREATER_GREATER WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_appending_to, redir, 0);
}
| REDIR_WORD GREATER_GREATER WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_appending_to, redir, REDIR_VARASSIGN);
}
| GREATER_BAR WORD
{
source.dest = 1;
redir.filename = $2;
$$ = make_redirection (source, r_output_force, redir, 0);
}
| NUMBER GREATER_BAR WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_output_force, redir, 0);
}
| REDIR_WORD GREATER_BAR WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_output_force, redir, REDIR_VARASSIGN);
}
| LESS_GREATER WORD
{
source.dest = 0;
redir.filename = $2;
$$ = make_redirection (source, r_input_output, redir, 0);
}
| NUMBER LESS_GREATER WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_input_output, redir, 0);
}
| REDIR_WORD LESS_GREATER WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_input_output, redir, REDIR_VARASSIGN);
}
| LESS_LESS WORD
{
source.dest = 0;
redir.filename = $2;
$$ = make_redirection (source, r_reading_until, redir, 0);
push_heredoc ($$);
}
| NUMBER LESS_LESS WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_reading_until, redir, 0);
push_heredoc ($$);
}
| REDIR_WORD LESS_LESS WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN);
push_heredoc ($$);
}
| LESS_LESS_MINUS WORD
{
source.dest = 0;
redir.filename = $2;
$$ = make_redirection (source, r_deblank_reading_until, redir, 0);
push_heredoc ($$);
}
| NUMBER LESS_LESS_MINUS WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_deblank_reading_until, redir, 0);
push_heredoc ($$);
}
| REDIR_WORD LESS_LESS_MINUS WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN);
push_heredoc ($$);
}
| LESS_LESS_LESS WORD
{
source.dest = 0;
redir.filename = $2;
$$ = make_redirection (source, r_reading_string, redir, 0);
}
| NUMBER LESS_LESS_LESS WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_reading_string, redir, 0);
}
| REDIR_WORD LESS_LESS_LESS WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_reading_string, redir, REDIR_VARASSIGN);
}
| LESS_AND NUMBER
{
source.dest = 0;
redir.dest = $2;
$$ = make_redirection (source, r_duplicating_input, redir, 0);
}
| NUMBER LESS_AND NUMBER
{
source.dest = $1;
redir.dest = $3;
$$ = make_redirection (source, r_duplicating_input, redir, 0);
}
| REDIR_WORD LESS_AND NUMBER
{
source.filename = $1;
redir.dest = $3;
$$ = make_redirection (source, r_duplicating_input, redir, REDIR_VARASSIGN);
}
| GREATER_AND NUMBER
{
source.dest = 1;
redir.dest = $2;
$$ = make_redirection (source, r_duplicating_output, redir, 0);
}
| NUMBER GREATER_AND NUMBER
{
source.dest = $1;
redir.dest = $3;
$$ = make_redirection (source, r_duplicating_output, redir, 0);
}
| REDIR_WORD GREATER_AND NUMBER
{
source.filename = $1;
redir.dest = $3;
$$ = make_redirection (source, r_duplicating_output, redir, REDIR_VARASSIGN);
}
| LESS_AND WORD
{
source.dest = 0;
redir.filename = $2;
$$ = make_redirection (source, r_duplicating_input_word, redir, 0);
}
| NUMBER LESS_AND WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_duplicating_input_word, redir, 0);
}
| REDIR_WORD LESS_AND WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_duplicating_input_word, redir, REDIR_VARASSIGN);
}
| GREATER_AND WORD
{
source.dest = 1;
redir.filename = $2;
$$ = make_redirection (source, r_duplicating_output_word, redir, 0);
}
| NUMBER GREATER_AND WORD
{
source.dest = $1;
redir.filename = $3;
$$ = make_redirection (source, r_duplicating_output_word, redir, 0);
}
| REDIR_WORD GREATER_AND WORD
{
source.filename = $1;
redir.filename = $3;
$$ = make_redirection (source, r_duplicating_output_word, redir, REDIR_VARASSIGN);
}
| GREATER_AND '-'
{
source.dest = 1;
redir.dest = 0;
$$ = make_redirection (source, r_close_this, redir, 0);
}
| NUMBER GREATER_AND '-'
{
source.dest = $1;
redir.dest = 0;
$$ = make_redirection (source, r_close_this, redir, 0);
}
| REDIR_WORD GREATER_AND '-'
{
source.filename = $1;
redir.dest = 0;
$$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN);
}
| LESS_AND '-'
{
source.dest = 0;
redir.dest = 0;
$$ = make_redirection (source, r_close_this, redir, 0);
}
| NUMBER LESS_AND '-'
{
source.dest = $1;
redir.dest = 0;
$$ = make_redirection (source, r_close_this, redir, 0);
}
| REDIR_WORD LESS_AND '-'
{
source.filename = $1;
redir.dest = 0;
$$ = make_redirection (source, r_close_this, redir, REDIR_VARASSIGN);
}
| AND_GREATER WORD
{
source.dest = 1;
redir.filename = $2;
$$ = make_redirection (source, r_err_and_out, redir, 0);
}
| AND_GREATER_GREATER WORD
{
source.dest = 1;
redir.filename = $2;
$$ = make_redirection (source, r_append_err_and_out, redir, 0);
}
;
simple_command_element: WORD
{ $$.word = $1; $$.redirect = 0; }
| ASSIGNMENT_WORD
{ $$.word = $1; $$.redirect = 0; }
| redirection
{ $$.redirect = $1; $$.word = 0; }
;
redirection_list: redirection
{
$$ = $1;
}
| redirection_list redirection
{
register REDIRECT *t;
for (t = $1; t->next; t = t->next)
;
t->next = $2;
$$ = $1;
}
;
simple_command: simple_command_element
{ $$ = make_simple_command ($1, (COMMAND *)NULL); }
| simple_command simple_command_element
{ $$ = make_simple_command ($2, $1); }
;
command: simple_command
{ $$ = clean_simple_command ($1); }
| shell_command
{ $$ = $1; }
| shell_command redirection_list
{
COMMAND *tc;
tc = $1;
if (tc && tc->redirects)
{
register REDIRECT *t;
for (t = tc->redirects; t->next; t = t->next)
;
t->next = $2;
}
else if (tc)
tc->redirects = $2;
$$ = $1;
}
| function_def
{ $$ = $1; }
| coproc
{ $$ = $1; }
;
shell_command: for_command
{ $$ = $1; }
| case_command
{ $$ = $1; }
| WHILE compound_list DO compound_list DONE
{ $$ = make_while_command ($2, $4); }
| UNTIL compound_list DO compound_list DONE
{ $$ = make_until_command ($2, $4); }
| select_command
{ $$ = $1; }
| if_command
{ $$ = $1; }
| subshell
{ $$ = $1; }
| group_command
{ $$ = $1; }
| arith_command
{ $$ = $1; }
| cond_command
{ $$ = $1; }
| arith_for_command
{ $$ = $1; }
;
for_command: FOR WORD newline_list DO compound_list DONE
{
$$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| FOR WORD newline_list '{' compound_list '}'
{
$$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| FOR WORD ';' newline_list DO compound_list DONE
{
$$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| FOR WORD ';' newline_list '{' compound_list '}'
{
$$ = make_for_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| FOR WORD newline_list IN word_list list_terminator newline_list DO compound_list DONE
{
$$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| FOR WORD newline_list IN word_list list_terminator newline_list '{' compound_list '}'
{
$$ = make_for_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| FOR WORD newline_list IN list_terminator newline_list DO compound_list DONE
{
$$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| FOR WORD newline_list IN list_terminator newline_list '{' compound_list '}'
{
$$ = make_for_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
;
arith_for_command: FOR ARITH_FOR_EXPRS list_terminator newline_list DO compound_list DONE
{
$$ = make_arith_for_command ($2, $6, arith_for_lineno);
if ($$ == 0) YYERROR;
if (word_top > 0) word_top--;
}
| FOR ARITH_FOR_EXPRS list_terminator newline_list '{' compound_list '}'
{
$$ = make_arith_for_command ($2, $6, arith_for_lineno);
if ($$ == 0) YYERROR;
if (word_top > 0) word_top--;
}
| FOR ARITH_FOR_EXPRS DO compound_list DONE
{
$$ = make_arith_for_command ($2, $4, arith_for_lineno);
if ($$ == 0) YYERROR;
if (word_top > 0) word_top--;
}
| FOR ARITH_FOR_EXPRS '{' compound_list '}'
{
$$ = make_arith_for_command ($2, $4, arith_for_lineno);
if ($$ == 0) YYERROR;
if (word_top > 0) word_top--;
}
;
select_command: SELECT WORD newline_list DO compound_list DONE
{
$$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| SELECT WORD newline_list '{' compound_list '}'
{
$$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $5, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| SELECT WORD ';' newline_list DO compound_list DONE
{
$$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| SELECT WORD ';' newline_list '{' compound_list '}'
{
$$ = make_select_command ($2, add_string_to_list ("\"$@\"", (WORD_LIST *)NULL), $6, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| SELECT WORD newline_list IN word_list list_terminator newline_list DO compound_list DONE
{
$$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| SELECT WORD newline_list IN word_list list_terminator newline_list '{' compound_list '}'
{
$$ = make_select_command ($2, REVERSE_LIST ($5, WORD_LIST *), $9, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| SELECT WORD newline_list IN list_terminator newline_list DO compound_list DONE
{
$$ = make_select_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| SELECT WORD newline_list IN list_terminator newline_list '{' compound_list '}'
{
$$ = make_select_command ($2, (WORD_LIST *)NULL, $8, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
;
case_command: CASE WORD newline_list IN newline_list ESAC
{
$$ = make_case_command ($2, (PATTERN_LIST *)NULL, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| CASE WORD newline_list IN case_clause_sequence newline_list ESAC
{
$$ = make_case_command ($2, $5, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
| CASE WORD newline_list IN case_clause ESAC
{
$$ = make_case_command ($2, $5, word_lineno[word_top]);
if (word_top > 0) word_top--;
}
;
function_def: WORD '(' ')' newline_list function_body
{ $$ = make_function_def ($1, $5, function_dstart, function_bstart); }
| FUNCTION WORD '(' ')' newline_list function_body
{ $$ = make_function_def ($2, $6, function_dstart, function_bstart); }
| FUNCTION WORD function_body
{ $$ = make_function_def ($2, $3, function_dstart, function_bstart); }
| FUNCTION WORD '\n' newline_list function_body
{ $$ = make_function_def ($2, $5, function_dstart, function_bstart); }
;
function_body: shell_command
{ $$ = $1; }
| shell_command redirection_list
{
COMMAND *tc;
tc = $1;
/* According to Posix.2 3.9.5, redirections
specified after the body of a function should
be attached to the function and performed when
the function is executed, not as part of the
function definition command. */
/* XXX - I don't think it matters, but we might
want to change this in the future to avoid
problems differentiating between a function
definition with a redirection and a function
definition containing a single command with a
redirection. The two are semantically equivalent,
though -- the only difference is in how the
command printing code displays the redirections. */
if (tc && tc->redirects)
{
register REDIRECT *t;
for (t = tc->redirects; t->next; t = t->next)
;
t->next = $2;
}