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parse.yy
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/* parse.yy - Bison C++ grammar for bash. */
/* Copyright (C) 1989-2022 Free Software Foundation, Inc.
Copyright 2022, Jake Hamby.
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/>.
*/
%require "3.2"
%language "c++"
%define api.value.type variant
%define api.token.constructor
%define api.namespace {bash}
%{
#include "config.h"
#include "shell.hh"
static inline bash::parser::symbol_type
yylex ()
{
return bash::the_shell->yylex ();
}
#if defined(__clang__)
#pragma clang diagnostic push
#pragma clang diagnostic ignored "-Wswitch-enum"
#pragma clang diagnostic ignored "-Wunreachable-code-break"
#pragma clang diagnostic ignored "-Wunused-macros"
#endif
%}
/* 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
%token COPROC COND_START COND_END COND_ERROR
%token IN BANG TIME TIMEOPT TIMEIGN
/* More general tokens. yylex () knows how to make these. */
%token <WORD_DESC_PTR> WORD ASSIGNMENT_WORD REDIR_WORD
%token <int64_t> NUMBER
%token <WORD_LIST_PTR> ARITH_CMD ARITH_FOR_EXPRS
%token <COMMAND_PTR> 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_PTR> inputunit command pipeline pipeline_command
%type <COMMAND_PTR> list0 list1 compound_list simple_list simple_list1
%type <COMMAND_PTR> simple_command shell_command
%type <COMMAND_PTR> for_command select_command case_command group_command
%type <COMMAND_PTR> arith_command
%type <COMMAND_PTR> cond_command
%type <COMMAND_PTR> arith_for_command
%type <COMMAND_PTR> coproc
%type <COMMAND_PTR> comsub
%type <COMMAND_PTR> function_def function_body if_command elif_clause subshell
%type <REDIRECT_PTR> redirection redirection_list
%type <ELEMENT> simple_command_element
%type <WORD_LIST_PTR> word_list pattern
%type <PATTERN_LIST_PTR> pattern_list case_clause_sequence case_clause
%type <int64_t> timespec
%type <int64_t> 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. */
Shell &sh = *the_shell;
sh.global_command = $1.value;
sh.eof_encountered = 0;
/* discard_parser_constructs (0); */
if (sh.parser_state & PST_CMDSUBST)
sh.parser_state |= PST_EOFTOKEN;
YYACCEPT;
}
| comsub
{
/* This is special; look at the production and how
parse_comsub sets token_to_read */
Shell &sh = *the_shell;
sh.global_command = $1.value;
sh.eof_encountered = 0;
YYACCEPT;
}
| '\n'
{
/* Case of regular command, but not a very
interesting one. Return a nullptr command. */
Shell &sh = *the_shell;
sh.global_command = nullptr;
if (sh.parser_state & PST_CMDSUBST)
sh.parser_state |= PST_EOFTOKEN;
YYACCEPT;
}
| error '\n'
{
/* Error during parsing. Return NULL command. */
Shell &sh = *the_shell;
sh.global_command = nullptr;
sh.eof_encountered = 0;
/* discard_parser_constructs (1); */
if (sh.interactive && sh.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 */
Shell &sh = *the_shell;
sh.global_command = nullptr;
if (sh.last_command_exit_value == 0)
sh.last_command_exit_value
= EX_BADUSAGE; /* force error return */
if (sh.interactive && sh.parse_and_execute_level == 0)
{
sh.handle_eof_input_unit ();
YYACCEPT;
}
else
{
YYABORT;
}
}
| yacc_EOF
{
// Case of EOF seen by itself. Do ignoreeof or not.
Shell &sh = *the_shell;
sh.global_command = nullptr;
sh.handle_eof_input_unit ();
YYACCEPT;
}
;
word_list: WORD
{
$$ = WORD_LIST_PTR ($1);
}
| word_list WORD
{
$$ = WORD_LIST_PTR ($2, $1);
}
;
redirection: '>' WORD
{
REDIRECTEE source (1);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_output_direction, redir, REDIR_NOFLAGS);
}
| '<' WORD
{
REDIRECTEE source (0);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_input_direction, redir, REDIR_NOFLAGS);
}
| NUMBER '>' WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_output_direction, redir, REDIR_NOFLAGS);
}
| NUMBER '<' WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_input_direction, redir, REDIR_NOFLAGS);
}
| REDIR_WORD '>' WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_output_direction, redir, REDIR_VARASSIGN);
}
| REDIR_WORD '<' WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_input_direction, redir, REDIR_VARASSIGN);
}
| GREATER_GREATER WORD
{
REDIRECTEE source (1);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_appending_to, redir, REDIR_NOFLAGS);
}
| NUMBER GREATER_GREATER WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_appending_to, redir, REDIR_NOFLAGS);
}
| REDIR_WORD GREATER_GREATER WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_appending_to, redir, REDIR_VARASSIGN);
}
| GREATER_BAR WORD
{
REDIRECTEE source (1);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_output_force, redir, REDIR_NOFLAGS);
}
| NUMBER GREATER_BAR WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_output_force, redir, REDIR_NOFLAGS);
}
| REDIR_WORD GREATER_BAR WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_output_force, redir, REDIR_VARASSIGN);
}
| LESS_GREATER WORD
{
REDIRECTEE source (0);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_input_output, redir, REDIR_NOFLAGS);
}
| NUMBER LESS_GREATER WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_input_output, redir, REDIR_NOFLAGS);
}
| REDIR_WORD LESS_GREATER WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_input_output, redir, REDIR_VARASSIGN);
}
| LESS_LESS WORD
{
REDIRECTEE source (0);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_reading_until, redir, REDIR_NOFLAGS);
the_shell->push_heredoc ($$.value);
}
| NUMBER LESS_LESS WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_reading_until, redir, REDIR_NOFLAGS);
the_shell->push_heredoc ($$.value);
}
| REDIR_WORD LESS_LESS WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_reading_until, redir, REDIR_VARASSIGN);
the_shell->push_heredoc ($$.value);
}
| LESS_LESS_MINUS WORD
{
REDIRECTEE source (0);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_deblank_reading_until, redir, REDIR_NOFLAGS);
the_shell->push_heredoc ($$.value);
}
| NUMBER LESS_LESS_MINUS WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_deblank_reading_until, redir, REDIR_NOFLAGS);
the_shell->push_heredoc ($$.value);
}
| REDIR_WORD LESS_LESS_MINUS WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_deblank_reading_until, redir, REDIR_VARASSIGN);
the_shell->push_heredoc ($$.value);
}
| LESS_LESS_LESS WORD
{
REDIRECTEE source (0);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_reading_string, redir, REDIR_NOFLAGS);
}
| NUMBER LESS_LESS_LESS WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_reading_string, redir, REDIR_NOFLAGS);
}
| REDIR_WORD LESS_LESS_LESS WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_reading_string, redir, REDIR_VARASSIGN);
}
| LESS_AND NUMBER
{
REDIRECTEE source (0);
REDIRECTEE redir (static_cast<int> ($2));
$$ = REDIRECT_PTR (
source, r_duplicating_input, redir, REDIR_NOFLAGS);
}
| NUMBER LESS_AND NUMBER
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir (static_cast<int> ($3));
$$ = REDIRECT_PTR (
source, r_duplicating_input, redir, REDIR_NOFLAGS);
}
| REDIR_WORD LESS_AND NUMBER
{
REDIRECTEE source ($1);
REDIRECTEE redir (static_cast<int> ($3));
$$ = REDIRECT_PTR (
source, r_duplicating_input, redir, REDIR_VARASSIGN);
}
| GREATER_AND NUMBER
{
REDIRECTEE source (1);
REDIRECTEE redir (static_cast<int> ($2));
$$ = REDIRECT_PTR (
source, r_duplicating_output, redir, REDIR_NOFLAGS);
}
| NUMBER GREATER_AND NUMBER
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir (static_cast<int> ($3));
$$ = REDIRECT_PTR (
source, r_duplicating_output, redir, REDIR_NOFLAGS);
}
| REDIR_WORD GREATER_AND NUMBER
{
REDIRECTEE source ($1);
REDIRECTEE redir (static_cast<int> ($3));
$$ = REDIRECT_PTR (
source, r_duplicating_output, redir, REDIR_VARASSIGN);
}
| LESS_AND WORD
{
REDIRECTEE source (0);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_duplicating_input_word, redir, REDIR_NOFLAGS);
}
| NUMBER LESS_AND WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_duplicating_input_word, redir, REDIR_NOFLAGS);
}
| REDIR_WORD LESS_AND WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$
= REDIRECT_PTR (source, r_duplicating_input_word, redir,
REDIR_VARASSIGN);
}
| GREATER_AND WORD
{
REDIRECTEE source (1);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_duplicating_output_word, redir, REDIR_NOFLAGS);
}
| NUMBER GREATER_AND WORD
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir ($3);
$$ = REDIRECT_PTR (
source, r_duplicating_output_word, redir, REDIR_NOFLAGS);
}
| REDIR_WORD GREATER_AND WORD
{
REDIRECTEE source ($1);
REDIRECTEE redir ($3);
$$
= REDIRECT_PTR (source, r_duplicating_output_word, redir,
REDIR_VARASSIGN);
}
| GREATER_AND '-'
{
REDIRECTEE source (1);
REDIRECTEE redir (0);
$$ = REDIRECT_PTR (
source, r_close_this, redir, REDIR_NOFLAGS);
}
| NUMBER GREATER_AND '-'
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir (0);
$$ = REDIRECT_PTR (
source, r_close_this, redir, REDIR_NOFLAGS);
}
| REDIR_WORD GREATER_AND '-'
{
REDIRECTEE source ($1);
REDIRECTEE redir (0);
$$ = REDIRECT_PTR (
source, r_close_this, redir, REDIR_VARASSIGN);
}
| LESS_AND '-'
{
REDIRECTEE source (0);
REDIRECTEE redir (0);
$$ = REDIRECT_PTR (
source, r_close_this, redir, REDIR_NOFLAGS);
}
| NUMBER LESS_AND '-'
{
REDIRECTEE source (static_cast<int> ($1));
REDIRECTEE redir (0);
$$ = REDIRECT_PTR (
source, r_close_this, redir, REDIR_NOFLAGS);
}
| REDIR_WORD LESS_AND '-'
{
REDIRECTEE source ($1);
REDIRECTEE redir (0);
$$ = REDIRECT_PTR (
source, r_close_this, redir, REDIR_VARASSIGN);
}
| AND_GREATER WORD
{
REDIRECTEE source (1);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_err_and_out, redir, REDIR_NOFLAGS);
}
| AND_GREATER_GREATER WORD
{
REDIRECTEE source (1);
REDIRECTEE redir ($2);
$$ = REDIRECT_PTR (
source, r_append_err_and_out, redir, REDIR_NOFLAGS);
}
;
simple_command_element: WORD
{
$$.word = $1.value;
$$.redirect = nullptr;
}
| ASSIGNMENT_WORD
{
$$.word = $1.value;
$$.redirect = nullptr;
}
| redirection
{
$$.redirect = $1.value;
$$.word = nullptr;
}
;
redirection_list: redirection
{
$$ = $1;
}
| redirection_list redirection
{
$$ = REDIRECT_PTR ($1.value->append ($2.value));
}
;
simple_command: simple_command_element
{
$$ = the_shell->make_simple_command ($1);
}
| simple_command simple_command_element
{
$$ = the_shell->make_simple_command ($2, $1);
}
;
command: simple_command
{
$$ = the_shell->clean_simple_command ($1);
}
| shell_command
{
$$ = $1;
}
| shell_command redirection_list
{
COMMAND *tc = $1.value;
if (tc->redirects)
{
tc->redirects->append ($2.value);
}
else
{
tc->redirects = $2.value;
}
$$ = COMMAND_PTR (tc);
}
| function_def
{
$$ = $1;
}
| coproc
{
$$ = $1;
}
;
shell_command: for_command
{
$$ = $1;
}
| case_command
{
$$ = $1;
}
| WHILE compound_list DO compound_list DONE
{
$$ = COMMAND_PTR (new UNTIL_WHILE_COM (
cm_while, $2.value, $4.value));
}
| UNTIL compound_list DO compound_list DONE
{
$$ = COMMAND_PTR (new UNTIL_WHILE_COM (
cm_until, $2.value, $4.value));
}
| select_command
{
$$ = $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
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_for, $2.value,
new WORD_LIST (new WORD_DESC ("\"$@\"")),
$5.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| FOR WORD newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_for, $2.value,
new WORD_LIST (new WORD_DESC ("\"$@\"")),
$5.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| FOR WORD ';' newline_list DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_for, $2.value,
new WORD_LIST (new WORD_DESC ("\"$@\"")),
$6.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| FOR WORD ';' newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_for, $2.value,
new WORD_LIST (new WORD_DESC ("\"$@\"")),
$6.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| FOR WORD newline_list IN word_list list_terminator newline_list DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_for, $2.value,
$5.value->reverse (),
$9.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| FOR WORD newline_list IN word_list list_terminator newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_for, $2.value,
$5.value->reverse (),
$9.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| FOR WORD newline_list IN list_terminator newline_list DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_for, $2.value, nullptr,
$8.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| FOR WORD newline_list IN list_terminator newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_for, $2.value, nullptr,
$8.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
;
arith_for_command: FOR ARITH_FOR_EXPRS list_terminator newline_list DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = sh.make_arith_for_command (
$2,
$6, sh.arith_for_lineno);
if ($$.value == nullptr)
YYERROR;
if (sh.word_top > 0)
sh.word_top--;
}
| FOR ARITH_FOR_EXPRS list_terminator newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = sh.make_arith_for_command (
$2,
$6, sh.arith_for_lineno);
if ($$.value == nullptr)
YYERROR;
if (sh.word_top > 0)
sh.word_top--;
}
| FOR ARITH_FOR_EXPRS DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = sh.make_arith_for_command (
$2,
$4, sh.arith_for_lineno);
if ($$.value == nullptr)
YYERROR;
if (sh.word_top > 0)
sh.word_top--;
}
| FOR ARITH_FOR_EXPRS '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = sh.make_arith_for_command (
$2,
$4, sh.arith_for_lineno);
if ($$.value == nullptr)
YYERROR;
if (sh.word_top > 0)
sh.word_top--;
}
;
select_command: SELECT WORD newline_list DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_select, $2.value,
new WORD_LIST (new WORD_DESC ("\"$@\"")),
$5.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| SELECT WORD newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_select, $2.value,
new WORD_LIST (new WORD_DESC ("\"$@\"")),
$5.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| SELECT WORD ';' newline_list DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_select, $2.value,
new WORD_LIST (new WORD_DESC ("\"$@\"")),
$6.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| SELECT WORD ';' newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_select, $2.value,
new WORD_LIST (new WORD_DESC ("\"$@\"")),
$6.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| SELECT WORD newline_list IN word_list list_terminator newline_list DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_select, $2.value,
$5.value->reverse (),
$9.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| SELECT WORD newline_list IN word_list list_terminator newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_select, $2.value,
$5.value->reverse (),
$9.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| SELECT WORD newline_list IN list_terminator newline_list DO compound_list DONE
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_select, $2.value,
nullptr, $8.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| SELECT WORD newline_list IN list_terminator newline_list '{' compound_list '}'
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new FOR_SELECT_COM (
cm_select, $2.value,
nullptr, $8.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
;
case_command: CASE WORD newline_list IN newline_list ESAC
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new CASE_COM ($2.value, nullptr,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| CASE WORD newline_list IN case_clause_sequence newline_list ESAC
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new CASE_COM ($2.value, $5.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
| CASE WORD newline_list IN case_clause ESAC
{
Shell &sh = *the_shell;
$$ = COMMAND_PTR (new CASE_COM ($2.value, $5.value,
sh.word_lineno[sh.word_top]));
if (sh.word_top > 0)
sh.word_top--;
}
;
function_def: WORD '(' ')' newline_list function_body
{
Shell &sh = *the_shell;
$$ = sh.make_function_def (
$1, $5, sh.function_dstart,
sh.function_bstart);
}
| FUNCTION WORD '(' ')' newline_list function_body
{
Shell &sh = *the_shell;
$$ = sh.make_function_def (
$2, $6, sh.function_dstart,
sh.function_bstart);
}
| FUNCTION WORD function_body
{
Shell &sh = *the_shell;
$$ = sh.make_function_def (
$2, $3, sh.function_dstart,
sh.function_bstart);
}
| FUNCTION WORD '\n' newline_list function_body
{
Shell &sh = *the_shell;
$$ = sh.make_function_def (
$2, $5, sh.function_dstart,
sh.function_bstart);
}
;
function_body: shell_command
{
$$ = $1;
}
| shell_command redirection_list
{
COMMAND *tc = $1.value;
/* 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->redirects)
tc->redirects->append ($2.value);
else
tc->redirects = $2.value;
$$ = COMMAND_PTR ($1);
}
;
subshell: '(' compound_list ')'
{
$$ = COMMAND_PTR (new SUBSHELL_COM ($2.value));
}
;
comsub: DOLPAREN compound_list ')'
{
$$ = $2;
}
| DOLPAREN newline_list ')'
{
$$ = nullptr;
}
;
coproc: COPROC shell_command
{
$$ = COMMAND_PTR (new COPROC_COM ("COPROC", $2.value));
}
| COPROC shell_command redirection_list
{
COMMAND *tc = $2.value;
if (tc->redirects)
tc->redirects->append ($3.value);
else
tc->redirects = $3.value;
$$ = COMMAND_PTR (new COPROC_COM ("COPROC", tc));
}
| COPROC WORD shell_command
{
$$ = COMMAND_PTR (new COPROC_COM ($2.value->word, $3.value));
}
| COPROC WORD shell_command redirection_list
{
COMMAND *tc = $3.value;
if (tc->redirects)
tc->redirects->append ($4.value);
else
tc->redirects = $4.value;
$$ = COMMAND_PTR (new COPROC_COM ($2.value->word, tc));
}
| COPROC simple_command
{
$$ = COMMAND_PTR (new COPROC_COM (
"COPROC", the_shell->clean_simple_command ($2).value));
}
;
if_command: IF compound_list THEN compound_list FI
{
$$ = COMMAND_PTR (new IF_COM ($2.value, $4.value, nullptr));
}
| IF compound_list THEN compound_list ELSE compound_list FI
{
$$ = COMMAND_PTR (new IF_COM ($2.value, $4.value, $6.value));
}
| IF compound_list THEN compound_list elif_clause FI
{
$$ = COMMAND_PTR (new IF_COM ($2.value, $4.value, $5.value));
}
;
group_command: '{' compound_list '}'
{
$$ = COMMAND_PTR (new GROUP_COM ($2.value));
}
;
arith_command: ARITH_CMD
{
$$ = COMMAND_PTR (new ARITH_COM ($1.value));
}