aboutsummaryrefslogtreecommitdiff
path: root/scripts
diff options
context:
space:
mode:
authorYann E. MORIN <yann.morin.1998@free.fr>2013-05-06 14:57:47 +0200
committerYann E. MORIN <yann.morin.1998@free.fr>2013-06-24 19:57:45 +0200
commit193b40aeb537b59eaa36e3dfaabedc2025332ebf (patch)
treef72ea744e1e9aeb53c5a546c1599d496412bd5c6 /scripts
parenta5f6d795f5941e97e757b643a6482968a66c6150 (diff)
downloadlinux-linaro-stable-193b40aeb537b59eaa36e3dfaabedc2025332ebf.tar.gz
kconfig: sort found symbols by relevance
When searching for symbols, return the symbols sorted by relevance. Sorting is done as thus: - first, symbols that match exactly - then, alphabetical sort Since the search can be a regexp, it is possible that more than one symbol matches exactly. In this case, we can't decide which to sort first, so we fallback to alphabeticall sort. Explain this (new!) sorting heuristic in the documentation. Reported-by: Jean Delvare <jdelvare@suse.de> Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr> Cc: Jean Delvare <jdelvare@suse.de> Cc: Michal Marek <mmarek@suse.cz> Cc: Roland Eggner <edvx1@systemanalysen.net> Cc: Wang YanQing <udknight@gmail.com> -- Changes v1->v2: - drop the previous, complex heuristic in favour of a simpler heuristic that is both easier to understand, *and* to maintain (Jean) - explain sorting heuristic in the doc (Jean)
Diffstat (limited to 'scripts')
-rw-r--r--scripts/kconfig/symbol.c78
1 files changed, 69 insertions, 9 deletions
diff --git a/scripts/kconfig/symbol.c b/scripts/kconfig/symbol.c
index ab8f4c835933..387d55483882 100644
--- a/scripts/kconfig/symbol.c
+++ b/scripts/kconfig/symbol.c
@@ -954,38 +954,98 @@ const char *sym_escape_string_value(const char *in)
return res;
}
+struct sym_match {
+ struct symbol *sym;
+ off_t so, eo;
+};
+
+/* Compare matched symbols as thus:
+ * - first, symbols that match exactly
+ * - then, alphabetical sort
+ */
+static int sym_rel_comp( const void *sym1, const void *sym2 )
+{
+ struct sym_match *s1 = *(struct sym_match **)sym1;
+ struct sym_match *s2 = *(struct sym_match **)sym2;
+ int l1, l2;
+
+ /* Exact match:
+ * - if matched length on symbol s1 is the length of that symbol,
+ * then this symbol should come first;
+ * - if matched length on symbol s2 is the length of that symbol,
+ * then this symbol should come first.
+ * Note: since the search can be a regexp, both symbols may match
+ * exactly; if this is the case, we can't decide which comes first,
+ * and we fallback to sorting alphabetically.
+ */
+ l1 = s1->eo - s1->so;
+ l2 = s2->eo - s2->so;
+ if (l1 == strlen(s1->sym->name) && l2 != strlen(s2->sym->name))
+ return -1;
+ if (l1 != strlen(s1->sym->name) && l2 == strlen(s2->sym->name))
+ return 1;
+
+ /* As a fallback, sort symbols alphabetically */
+ return strcmp(s1->sym->name, s2->sym->name);
+}
+
struct symbol **sym_re_search(const char *pattern)
{
struct symbol *sym, **sym_arr = NULL;
+ struct sym_match **sym_match_arr = NULL;
int i, cnt, size;
regex_t re;
+ regmatch_t match[1];
cnt = size = 0;
/* Skip if empty */
if (strlen(pattern) == 0)
return NULL;
- if (regcomp(&re, pattern, REG_EXTENDED|REG_NOSUB|REG_ICASE))
+ if (regcomp(&re, pattern, REG_EXTENDED|REG_ICASE))
return NULL;
for_all_symbols(i, sym) {
+ struct sym_match *tmp_sym_match;
if (sym->flags & SYMBOL_CONST || !sym->name)
continue;
- if (regexec(&re, sym->name, 0, NULL, 0))
+ if (regexec(&re, sym->name, 1, match, 0))
continue;
if (cnt + 1 >= size) {
- void *tmp = sym_arr;
+ void *tmp;
size += 16;
- sym_arr = realloc(sym_arr, size * sizeof(struct symbol *));
- if (!sym_arr) {
- free(tmp);
- return NULL;
+ tmp = realloc(sym_match_arr, size * sizeof(struct sym_match *));
+ if (!tmp) {
+ goto sym_re_search_free;
}
+ sym_match_arr = tmp;
}
sym_calc_value(sym);
- sym_arr[cnt++] = sym;
+ tmp_sym_match = (struct sym_match*)malloc(sizeof(struct sym_match));
+ if (!tmp_sym_match)
+ goto sym_re_search_free;
+ tmp_sym_match->sym = sym;
+ /* As regexec return 0, we know we have a match, so
+ * we can use match[0].rm_[se]o without further checks
+ */
+ tmp_sym_match->so = match[0].rm_so;
+ tmp_sym_match->eo = match[0].rm_eo;
+ sym_match_arr[cnt++] = tmp_sym_match;
}
- if (sym_arr)
+ if (sym_match_arr) {
+ qsort(sym_match_arr, cnt, sizeof(struct sym_match*), sym_rel_comp);
+ sym_arr = malloc((cnt+1) * sizeof(struct symbol));
+ if (!sym_arr)
+ goto sym_re_search_free;
+ for (i = 0; i < cnt; i++)
+ sym_arr[i] = sym_match_arr[i]->sym;
sym_arr[cnt] = NULL;
+ }
+sym_re_search_free:
+ if (sym_match_arr) {
+ for (i = 0; i < cnt; i++)
+ free(sym_match_arr[i]);
+ free(sym_match_arr);
+ }
regfree(&re);
return sym_arr;