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options: make 'highlight' read-only

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Björn Linse
2017-05-08 17:17:10 +02:00
parent edfe0980f1
commit 8d8b6224d9
8 changed files with 88 additions and 208 deletions
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112
src/nvim/syntax.c
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@@ -7304,110 +7304,34 @@ static void highlight_attr_set_all(void)
}
}
/*
* Translate the 'highlight' option into attributes in highlight_attr[] and
* set up the user highlights User1..9. A set of
* corresponding highlights to use on top of HLF_SNC is computed.
* Called only when the 'highlight' option has been changed and upon first
* screen redraw after any :highlight command.
* Return FAIL when an invalid flag is found in 'highlight'. OK otherwise.
*/
int highlight_changed(void)
/// Tranlate highlight groups into attributes in highlight_attr[] and set up
/// the user highlights User1..9. A set of corresponding highlights to use on
/// top of HLF_SNC is computed. Called only when nvim starts and upon first
/// screen redraw after any :highlight command.
void highlight_changed(void)
{
int hlf;
int i;
char_u *p;
int attr;
char_u *end;
int id;
char_u userhl[10];
int id_SNC = -1;
int id_S = -1;
int hlcnt;
static int hl_flags[HLF_COUNT] = HL_FLAGS;
need_highlight_changed = FALSE;
/*
* Clear all attributes.
*/
for (hlf = 0; hlf < (int)HLF_COUNT; ++hlf)
highlight_attr[hlf] = 0;
/*
* First set all attributes to their default value.
* Then use the attributes from the 'highlight' option.
*/
for (i = 0; i < 2; ++i) {
if (i)
p = p_hl;
else
p = get_highlight_default();
if (p == NULL) /* just in case */
continue;
while (*p) {
for (hlf = 0; hlf < (int)HLF_COUNT; ++hlf)
if (hl_flags[hlf] == *p)
break;
++p;
if (hlf == (int)HLF_COUNT || *p == NUL)
return FAIL;
/*
* Allow several hl_flags to be combined, like "bu" for
* bold-underlined.
*/
attr = 0;
bool colon = false;
for (; *p && *p != ','; ++p) { // parse upto comma
if (ascii_iswhite(*p)) { // ignore white space
continue;
}
if (colon) /* Combination with ':' is not allowed. */
return FAIL;
switch (*p) {
case 'b': attr |= HL_BOLD;
break;
case 'i': attr |= HL_ITALIC;
break;
case '-':
case 'n': /* no highlighting */
break;
case 'r': attr |= HL_INVERSE;
break;
case 's': attr |= HL_STANDOUT;
break;
case 'u': attr |= HL_UNDERLINE;
break;
case 'c': attr |= HL_UNDERCURL;
break;
case ':': ++p; /* highlight group name */
if (attr || *p == NUL) /* no combinations */
return FAIL;
colon = true;
end = vim_strchr(p, ',');
if (end == NULL)
end = p + STRLEN(p);
id = syn_check_group(p, (int)(end - p));
if (id == 0)
return FAIL;
attr = syn_id2attr(id);
p = end - 1;
if (hlf == (int)HLF_SNC)
id_SNC = syn_get_final_id(id);
else if (hlf == (int)HLF_S)
id_S = syn_get_final_id(id);
break;
default: return FAIL;
}
}
highlight_attr[hlf] = attr;
p = skip_to_option_part(p); /* skip comma and spaces */
/// Translate builtin highlight groups into attributes for quick lookup.
for (int hlf = 0; hlf < (int)HLF_COUNT; hlf++) {
id = syn_check_group((char_u *)hlf_names[hlf], STRLEN(hlf_names[hlf]));
if (id == 0) {
abort();
}
attr = syn_id2attr(id);
if (hlf == (int)HLF_SNC) {
id_SNC = syn_get_final_id(id);
} else if (hlf == (int)HLF_S) {
id_S = syn_get_final_id(id);
}
highlight_attr[hlf] = attr;
}
/* Setup the user highlights
@@ -7472,8 +7396,6 @@ int highlight_changed(void)
}
}
highlight_ga.ga_len = hlcnt;
return OK;
}