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hush
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hush: support "for if in do done then; do echo $if; done" case 

function                                             old     new   delta
done_pipe                                             83      95     +12
parse_stream                                        1758    1764      +6
done_word                                            674     647     -27
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/1 up/down: 18/-27)             Total: -9 bytes
This commit is contained in:
Denis Vlasenko 2008-07-06 10:01:13 +00:00
parent d48e81f0cd
commit 733e3fbc2f
3 changed files with 41 additions and 24 deletions
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59
shell/hush.c
View File

@ -1344,7 +1344,7 @@ static int setup_redirects(struct child_prog *prog, int squirrel[])
if (redir->dup == -1) {
char *p;
mode = redir_table[redir->rd_type].mode;
//TODO: check redir to names like '\\'
//TODO: check redir for names like '\\'
p = expand_string_to_string(redir->rd_filename);
openfd = open_or_warn(p, mode);
free(p);
@ -2854,17 +2854,7 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
continue;
debug_printf("found reserved word %s, res %d\n", r->literal, r->res);
if (r->flag == 0) { /* '!' */
#if ENABLE_HUSH_LOOPS
if (ctx->ctx_res_w == RES_IN) {
/* 'for a in ! a b c; ...' - ! isn't a keyword here */
break;
}
#endif
if (ctx->ctx_inverted /* bash doesn't accept '! ! true' */
#if ENABLE_HUSH_LOOPS
|| ctx->ctx_res_w == RES_FOR /* example: 'for ! a' */
#endif
) {
if (ctx->ctx_inverted) { /* bash doesn't accept '! ! true' */
syntax(NULL);
IF_HAS_KEYWORDS(ctx->ctx_res_w = RES_SNTX;)
}
@ -2885,7 +2875,7 @@ static int reserved_word(const o_string *word, struct p_context *ctx)
*new = *ctx; /* physical copy */
initialize_context(ctx);
ctx->stack = new;
} else if (ctx->ctx_res_w == RES_NONE || !(ctx->old_flag & (1 << r->res))) {
} else if (/*ctx->ctx_res_w == RES_NONE ||*/ !(ctx->old_flag & (1 << r->res))) {
syntax(NULL);
ctx->ctx_res_w = RES_SNTX;
return 1;
@ -2940,7 +2930,10 @@ static int done_word(o_string *word, struct p_context *ctx)
return 1;
}
#if HAS_KEYWORDS
if (!child->argv) { /* if it's the first word... */
if (!child->argv /* if it's the first word... */
&& ctx->ctx_res_w != RES_FOR /* ...not after FOR or IN */
&& ctx->ctx_res_w != RES_IN
) {
debug_printf_parse(": checking '%s' for reserved-ness\n", word->data);
if (reserved_word(word, ctx)) {
o_reset(word);
@ -2953,9 +2946,9 @@ static int done_word(o_string *word, struct p_context *ctx)
if (word->nonnull /* word had "xx" or 'xx' at least as part of it. */
/* optimization: and if it's ("" or '') or ($v... or `cmd`...): */
&& (word->data[0] == '\0' || word->data[0] == SPECIAL_VAR_SYMBOL)
/* (otherwise it's "abc".... and is already safe) */
/* (otherwise it's known to be not empty and is already safe) */
) {
/* but exclude "$@" - it expands to no word despite "" */
/* exclude "$@" - it can expand to no word despite "" */
char *p = word->data;
while (p[0] == SPECIAL_VAR_SYMBOL
&& (p[1] & 0x7f) == '@'
@ -2964,7 +2957,9 @@ static int done_word(o_string *word, struct p_context *ctx)
p += 3;
}
if (p == word->data || p[0] != '\0') {
/* Insert "empty variable" reference, this makes
/* saw no "$@", or not only "$@" but some
* real text is there too */
/* insert "empty variable" reference, this makes
* e.g. "", $empty"" etc to not disappear */
o_addchr(word, SPECIAL_VAR_SYMBOL);
o_addchr(word, SPECIAL_VAR_SYMBOL);
@ -2979,8 +2974,13 @@ static int done_word(o_string *word, struct p_context *ctx)
#if ENABLE_HUSH_LOOPS
/* Force FOR to have just one word (variable name) */
if (ctx->ctx_res_w == RES_FOR)
/* NB: basically, this makes hush see "for v in ..." syntax as if
* as it is "for v; in ...". FOR and IN become two pipe structs
* in parse tree. */
if (ctx->ctx_res_w == RES_FOR) {
//TODO: check that child->argv[0] is a valid variable name!
done_pipe(ctx, PIPE_SEQ);
}
#endif
debug_printf_parse("done_word return 0\n");
return 0;
@ -3030,19 +3030,28 @@ static void done_pipe(struct p_context *ctx, pipe_style type)
debug_printf_parse("done_pipe entered, followup %d\n", type);
not_null = done_command(ctx); /* implicit closure of previous command */
ctx->pipe->followup = type;
IF_HAS_KEYWORDS(ctx->pipe->res_word = ctx->ctx_res_w;)
IF_HAS_KEYWORDS(ctx->pipe->pi_inverted = ctx->ctx_inverted;)
IF_HAS_KEYWORDS(ctx->ctx_inverted = 0;)
IF_HAS_KEYWORDS(ctx->pipe->res_word = ctx->ctx_res_w;)
/* Without this check, even just <enter> on command line generates
* tree of three NOPs (!). Which is harmless but annoying.
* IOW: it is safe to do it unconditionally.
* RES_IN case is for "for a in; do ..." (empty IN set)
* to work. */
if (not_null USE_HUSH_LOOPS(|| ctx->pipe->res_word == RES_IN)) {
* RES_NONE case is for "for a in; do ..." (empty IN set)
* to work, possibly other cases too. */
if (not_null IF_HAS_KEYWORDS(|| ctx->ctx_res_w != RES_NONE)) {
struct pipe *new_p = new_pipe();
ctx->pipe->next = new_p;
ctx->pipe = new_p;
ctx->child = NULL; /* needed! */
/* RES_IF, RES_WHILE etc are "sticky" -
* they remain set for commands inside if/while.
* This is used to control execution.
* RES_FOR and RES_IN are NOT sticky (needed to support
* cases where variable or value happens to match a keyword):
*/
if (ctx->ctx_res_w == RES_FOR
|| ctx->ctx_res_w == RES_IN)
ctx->ctx_res_w = RES_NONE;
/* Create the memory for child, roughly:
* ctx->pipe->progs = new struct child_prog;
* ctx->pipe->progs[0].family = ctx->pipe;
@ -3444,7 +3453,7 @@ static int handle_dollar(o_string *dest, struct in_str *input)
return 0;
}
/* Scan input, call done_word() whenever full IFS delemited word was seen.
/* Scan input, call done_word() whenever full IFS delimited word was seen.
* call done_pipe if '\n' was seen (and end_trigger != NULL)
* Return if (non-quoted) char in end_trigger was seen; or on parse error. */
/* Return code is 0 if end_trigger char is met,
@ -3517,7 +3526,9 @@ static int parse_stream(o_string *dest, struct p_context *ctx,
//err chk?
done_pipe(ctx, PIPE_SEQ);
}
if (!HAS_KEYWORDS IF_HAS_KEYWORDS(|| ctx->ctx_res_w == RES_NONE)) {
if (!HAS_KEYWORDS
IF_HAS_KEYWORDS(|| (ctx->ctx_res_w == RES_NONE && ctx->old_flag == 0))
) {
debug_printf_parse("parse_stream return 0: end_trigger char found\n");
return 0;
}

4
shell/hush_test/hush-misc/for_with_keywords.right Normal file
View File

@ -0,0 +1,4 @@
do
done
then
OK: 0

2
shell/hush_test/hush-misc/for_with_keywords.tests Executable file
View File

@ -0,0 +1,2 @@
for if in do done then; do echo $if; done
echo OK: $?