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echo builtin

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+ WIP grammar rules in parsing.txt
+ test trop_de_pipes.sh
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LuckyLaszlo
2021-10-22 10:53:06 +02:00
parent 1054f3d6ff
commit 39de10e001
10 changed files with 241 additions and 59 deletions
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parsing.txt Normal file
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/* -------------------------------------------------------
The grammar symbols
------------------------------------------------------- */
%token WORD
%token LESS // '<'
%token GREAT // '>'
%token DLESS // '<<'
%token DGREAT // '>>'
%token PIPE // '|'
/* -------------------------------------------------------
The Grammar
------------------------------------------------------- */
%start program
%%
pipeline : pipe_sequence
;
pipe_sequence : command
| pipe_sequence '|' command
;
command : simple_command
;
simple_command : cmd_prefix cmd_word cmd_suffix
| cmd_prefix cmd_word
| cmd_prefix
| cmd_name cmd_suffix
| cmd_name
;
cmd_name : WORD /* Apply rule 7a */
;
cmd_word : WORD /* Apply rule 7b */
;
cmd_prefix : io_redirect
| cmd_prefix io_redirect
;
cmd_suffix : io_redirect
| cmd_suffix io_redirect
| WORD
| cmd_suffix WORD
;
io_redirect : io_file
| io_here
;
io_file : '<' filename
| LESSAND filename
| '>' filename
| GREATAND filename
| DGREAT filename
| LESSGREAT filename
| CLOBBER filename
;
filename : WORD /* Apply rule 2 */
;
io_here : DLESS here_end
;
here_end : WORD /* Apply rule 3 */
;