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patch 8.2.2305: Vim9: "++var" and "--var" are silently accepted

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Problem:    Vim9: "++var" and "--var" are silently accepted.
Solution:   Give an error message.
This commit is contained in:
Bram Moolenaar
2021-01-05 22:08:20 +01:00
parent 0acbf5ae66
commit b23279d7a2
5 changed files with 75 additions and 23 deletions
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26
src/eval.c
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@@ -3188,6 +3188,28 @@ eval6(
return OK;
}
int
eval_leader(char_u **arg, int vim9)
{
char_u *s = *arg;
char_u *p = *arg;
while (*p == '!' || *p == '-' || *p == '+')
{
char_u *n = skipwhite(p + 1);
// ++, --, -+ and +- are not accepted in Vim9 script
if (vim9 && (*p == '-' || *p == '+') && (*n == '-' || *n == '+'))
{
semsg(_(e_invexpr2), s);
return FAIL;
}
p = n;
}
*arg = p;
return OK;
}
/*
* Handle sixth level expression:
* number number constant
@@ -3243,8 +3265,8 @@ eval7(
* Skip '!', '-' and '+' characters. They are handled later.
*/
start_leader = *arg;
while (**arg == '!' || **arg == '-' || **arg == '+')
*arg = skipwhite(*arg + 1);
if (eval_leader(arg, in_vim9script()) == FAIL)
return FAIL;
end_leader = *arg;
if (**arg == '.' && (!isdigit(*(*arg + 1))