remove list_length and instead add a method

include/cubescript/cubescript.hh

@@ -768,14 +768,14 @@ namespace util {
 
         void skip();
         bool parse();
+        ostd::Size count();
 
-        CsString element();
+        CsString element() const;
 
 private:
         CsState &p_state;
     };
 
-    OSTD_EXPORT ostd::Size list_length(CsState &cs, ostd::ConstCharRange s);
     OSTD_EXPORT ostd::Maybe<CsString> list_index(
         CsState &cs, ostd::ConstCharRange s, ostd::Size idx
     );

src/cs_util.cc

@@ -372,7 +372,15 @@ endblock:
         return true;
     }
 
-    CsString ListParser::element() {
+    ostd::Size ListParser::count() {
+        ostd::Size ret = 0;
+        while (parse()) {
+            ++ret;
+        }
+        return ret;
+    }
+
+    CsString ListParser::element() const {
         CsString s;
         s.reserve(item.size());
         if (!quote.empty() && (*quote == '"')) {
@@ -387,15 +395,6 @@ endblock:
         return s;
     }
 
-    OSTD_EXPORT ostd::Size list_length(CsState &cs, ostd::ConstCharRange s) {
-        ListParser p(cs, s);
-        ostd::Size ret = 0;
-        while (p.parse()) {
-            ++ret;
-        }
-        return ret;
-    }
-
     OSTD_EXPORT ostd::Maybe<CsString> list_index(
         CsState &cs, ostd::ConstCharRange s, ostd::Size idx
     ) {

src/lib_list.cc

@@ -139,7 +139,7 @@ static void cs_init_lib_list_sort(CsState &cs);
 
 void cs_init_lib_list(CsState &gcs) {
     gcs.new_command("listlen", "s", [](auto &cs, auto args, auto &res) {
-        res.set_int(CsInt(util::list_length(cs, args[0].get_strr())));
+        res.set_int(CsInt(util::ListParser(cs, args[0].get_strr()).count()));
     });
 
     gcs.new_command("at", "si1V", [](auto &cs, auto args, auto &res) {
@@ -421,7 +421,7 @@ end:
         auto buf = ostd::appender<CsString>();
         ostd::ConstCharRange s = args[0].get_strr();
         ostd::ConstCharRange conj = args[1].get_strr();
-        ostd::Size len = util::list_length(cs, s);
+        ostd::Size len = util::ListParser(cs, s).count();
         ostd::Size n = 0;
         for (util::ListParser p(cs, s); p.parse(); ++n) {
             if (!p.quote.empty() && (p.quote.front() == '"')) {