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handle scripting keywords; we don't implement them yet but we're ready to

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IoIxD 2026-02-03 11:50:34 -07:00
commit f96a9d604e
4 changed files with 76 additions and 4 deletions
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29
src/exec.c
View file

@ -1,3 +1,32 @@
/*
Copyright 2026 msh team
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice,
this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
3. Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from this
software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS “AS IS”
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
POSSIBILITY OF SUCH DAMAGE.
*/
#include "builtins/builtins.h"
#include "lexer/lexer.h"
#include "system/system.h"

35
src/lexer/lexer.c
View file

@ -64,6 +64,35 @@ void msh_lexer_push_item(msh_lexer *lexer, msh_lexer_item_type type, char *buf,
lexer->item_list_cur = lexer->item_list_cur->next;
};
/* function for either pushing a regular word or pushing a keyword to the
* buffer. */
static void word_push(msh_lexer *lexer, char *cur_word_buf, int *n) {
int hash = 0;
cur_word_buf[*n] = '\0';
hash = str_hash(cur_word_buf);
switch (hash) {
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_IF:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_THEN:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_ELSE:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_ELIF:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_FI:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_CASE:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_IN:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_ESAC:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_FOR:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_WHILE:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_UNTIL:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_DO:
case MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_DONE:
msh_lexer_push_item(lexer, hash, cur_word_buf, *n);
break;
default:
msh_lexer_push_item(lexer, MSH_LEXER_ITEM_TYPE_WORD, cur_word_buf, *n);
break;
}
*n += 1;
};
void msh_lexer_parse(msh_lexer *lexer, char *buf, SIZE_TYPE sz) {
int i = 0, n = 0, j = 0;
char cur_word_buf[1024];
@ -94,8 +123,7 @@ void msh_lexer_parse(msh_lexer *lexer, char *buf, SIZE_TYPE sz) {
char do_clear = 0;
switch (buf[i]) {
case '#':
cur_word_buf[n++] = '\0';
msh_lexer_push_item(lexer, MSH_LEXER_ITEM_TYPE_WORD, cur_word_buf, n);
word_push(lexer, cur_word_buf, &n);
goto lexer_cancel;
case '\\':
escaping = 1;
@ -125,8 +153,7 @@ void msh_lexer_parse(msh_lexer *lexer, char *buf, SIZE_TYPE sz) {
/* fallthrough */
case '\n':
case '\0':
cur_word_buf[n++] = '\0';
msh_lexer_push_item(lexer, MSH_LEXER_ITEM_TYPE_WORD, cur_word_buf, n);
word_push(lexer, cur_word_buf, &n);
do_clear = 1;
break;
default:

15
src/lexer/lexer.h
View file

@ -41,6 +41,21 @@ typedef enum msh_lexer_item_type_t {
MSH_LEXER_ITEM_TYPE_OP_PIPE, /* | */
MSH_LEXER_ITEM_TYPE_OP_CONTROL, /* & */
MSH_LEXER_ITEM_TYPE_OP_SEMICOLON, /* ; */
/* the keyword types have values corresponding to their string hash */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_IF = 177678, /* if */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_THEN = 193506854, /* then */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_ELSE = 193490665, /* else */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_ELIF = 193490655, /* elif */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_FI = 177675655, /* fi */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_CASE = 193488124, /* case */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_IN = 177678124, /* in */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_ESAC = 193490878, /* esac */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_FOR = 586338678, /* for */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_WHILE = 2090866937, /* while */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_UNTIL = 2090801957, /* until */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_DO = 1776731957, /* do */
MSH_LEXER_ITEM_TYPE_WORD_KEYWORD_DONE = 1934896707, /* done */
} msh_lexer_item_type;
typedef struct msh_lexer_item_t {

1
src/main.c
View file

@ -29,6 +29,7 @@
*/
#include "lexer/lexer.h"
#include "system/system.h"
#include "util/util.h"
static struct {
msh_lexer lexer;