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patch 8.1.0973: pattern with syntax error gives threee error messages

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Problem:    Pattern with syntax error gives threee error messages. (Kuang-che
            Wu)
Solution:   Remove outdated internal error.  Don't fall back to other engine
            after an error.
This commit is contained in:
Bram Moolenaar
2019-02-22 17:29:43 +01:00
parent 72e83c1ae5
commit cd62512c55
4 changed files with 13 additions and 6 deletions
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7
src/regexp.c
View File

@@ -7969,6 +7969,7 @@ vim_regcomp(char_u *expr_arg, int re_flags)
{
regprog_T *prog = NULL;
char_u *expr = expr_arg;
int save_called_emsg;
regexp_engine = p_re;
@@ -8004,6 +8005,8 @@ vim_regcomp(char_u *expr_arg, int re_flags)
/*
* First try the NFA engine, unless backtracking was requested.
*/
save_called_emsg = called_emsg;
called_emsg = FALSE;
if (regexp_engine != BACKTRACKING_ENGINE)
prog = nfa_regengine.regcomp(expr,
re_flags + (regexp_engine == AUTOMATIC_ENGINE ? RE_AUTO : 0));
@@ -8032,13 +8035,15 @@ vim_regcomp(char_u *expr_arg, int re_flags)
* If the NFA engine failed, try the backtracking engine.
* The NFA engine also fails for patterns that it can't handle well
* but are still valid patterns, thus a retry should work.
* But don't try if an error message was given.
*/
if (regexp_engine == AUTOMATIC_ENGINE)
if (regexp_engine == AUTOMATIC_ENGINE && !called_emsg)
{
regexp_engine = BACKTRACKING_ENGINE;
prog = bt_regengine.regcomp(expr, re_flags);
}
}
called_emsg |= save_called_emsg;
if (prog != NULL)
{

5
src/regexp_nfa.c
View File

@@ -7252,12 +7252,7 @@ nfa_regcomp(char_u *expr, int re_flags)
* (and count its size). */
postfix = re2post();
if (postfix == NULL)
{
/* TODO: only give this error for debugging? */
if (post_ptr >= post_end)
siemsg("Internal error: estimated max number of states insufficient: %ld", post_end - post_start);
goto fail; /* Cascaded (syntax?) error */
}
/*
* In order to build the NFA, we parse the input regexp twice:

5
src/testdir/test_search.vim
View File

@@ -1220,3 +1220,8 @@ func Test_large_hex_chars()
call assert_match('E678:', v:exception)
endtry
endfunc
func Test_one_error_msg()
" This was also giving an internal error
call assert_fails('call search(" \\((\\v[[=P=]]){185}+ ")', 'E871:')
endfunc

2
src/version.c
View File

@@ -779,6 +779,8 @@ static char *(features[]) =
static int included_patches[] =
{ /* Add new patch number below this line */
/**/
973,
/**/
972,
/**/