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syntax analysis with simplified shell grammar

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+ TODO : bug to fix in lexer.c
This commit is contained in:
LuckyLaszlo
2021-10-24 19:58:19 +02:00
parent 906074d2cb
commit 815cedb8ca
11 changed files with 400 additions and 18 deletions
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45
parsing.txt
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@@ -1,3 +1,5 @@
https://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html#tag_18_10_02
/* -------------------------------------------------------
The grammar symbols
------------------------------------------------------- */
@@ -8,6 +10,49 @@
%token DGREAT // '>>'
%token PIPE // '|'
/* -------------------------------------------------------
The Simplified Grammar
------------------------------------------------------- */
%start program
%%
pipeline : command
| pipe_sequence '|' command
;
command : cmd_prefix cmd_name cmd_suffix
| cmd_prefix cmd_name
| cmd_name cmd_suffix
| cmd_name
;
cmd_name : WORD // Apply rule 7a
;
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
;
/* -------------------------------------------------------
The Grammar
------------------------------------------------------- */