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Specify argument in which an error happened

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This commit is contained in:
Přemysl Eric Janouch 2017-05-21 17:57:31 +02:00
parent dae5622955
commit 9ae0e6dc0e
Signed by: p
GPG Key ID: B715679E3A361BE6
1 changed files with 23 additions and 9 deletions
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32
ell.c
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@ -734,6 +734,14 @@ set_error (struct context *ctx, const char *format, ...) {
return false;
}
static bool
can_modify_error (struct context *ctx) {
// In that case, `error' is NULL and there's nothing else to do anyway.
// Errors starting with an underscore are exceptions and would not work
// with stack traces generated this way.
return !ctx->memory_failure && ctx->error[0] != '_';
}
static bool
assign_arguments (struct context *ctx, struct item *names) {
struct item *arg = ctx->arguments;
@ -757,19 +765,28 @@ static bool execute (struct context *ctx, struct item *body, struct item **);
static bool
execute_args (struct context *ctx, struct item *args, struct item **res) {
// TODO: prepend "(argument %d) ->" to any resulting error
size_t i = 0;
for (; args; args = args->next) {
struct item *evaluated = NULL;
if (!execute_statement (ctx, args, &evaluated))
return false;
// Arguments should not evaporate, default to a nil value
if (!evaluated && !check (ctx, (evaluated = new_list (NULL))))
return false;
if (!execute_statement (ctx, args, &evaluated)
|| (!evaluated && !check (ctx, (evaluated = new_list (NULL)))))
goto error;
item_free_list (evaluated->next);
evaluated->next = NULL;
res = &(*res = evaluated)->next;
i++;
}
return true;
error:
// Once the code flows like this, at least make some use of it
if (can_modify_error (ctx)) {
char *tmp = ctx->error;
ctx->error = NULL;
set_error (ctx, "(argument %zu) -> %s", i, tmp);
free (tmp);
}
return false;
}
static bool
@ -854,10 +871,7 @@ execute_statement
if (statement->head->type == ITEM_STRING)
name = statement->head->value;
// In that case, `error' is NULL and there's nothing else to do anyway.
// Errors starting with an underscore are exceptions and would not work
// with stack traces generated this way.
if (!ctx->memory_failure && ctx->error[0] != '_') {
if (can_modify_error (ctx)) {
char *tmp = ctx->error;
ctx->error = NULL;
set_error (ctx, "%s -> %s", name, tmp);