fix build with libc++, and try using it in CI with clang

.ci/build-cs

@@ -11,6 +11,7 @@ current_triplet=`$CC -dumpmachine`
 
 if [ "$CC" = "clang" ]; then
     export CXX="clang++"
+    export CXXFLAGS="-stdlib=libc++"
 else
     export CXX="g++-10"
 fi

include/cubescript/cubescript/error.hh

@@ -51,7 +51,7 @@ struct LIBCUBESCRIPT_EXPORT error {
     {}
 
     std::string_view what() const {
-        return std::string_view{p_errbeg, p_errend};
+        return std::string_view{p_errbeg, std::size_t(p_errend - p_errbeg)};
     }
 
     stack_state &get_stack() {

include/cubescript/cubescript/util.hh

@@ -43,7 +43,9 @@ struct LIBCUBESCRIPT_EXPORT list_parser {
     }
 
     std::string_view get_input() const {
-        return std::string_view{p_input_beg, p_input_end};
+        return std::string_view{
+            p_input_beg, std::size_t(p_input_end - p_input_beg)
+        };
     }
 
     bool parse();
@@ -52,10 +54,10 @@ struct LIBCUBESCRIPT_EXPORT list_parser {
     string_ref get_item() const;
 
     std::string_view get_raw_item() const {
-        return std::string_view{p_ibeg, p_iend};
+        return std::string_view{p_ibeg, std::size_t(p_iend - p_ibeg)};
     }
     std::string_view get_quoted_item() const {
-        return std::string_view{p_qbeg, p_qend};
+        return std::string_view{p_qbeg, std::size_t(p_qend - p_qbeg)};
     }
 
     void skip_until_item();

src/cs_gen.cc

@@ -242,9 +242,7 @@ void gen_state::gen_val_block(std::string_view v) {
                     break;
                 case '\"': { /* quoted string */
                     char const *start = str;
-                    str = parse_string(
-                        *ts.pstate, std::string_view{str, send}
-                    );
+                    str = parse_string(*ts.pstate, make_str_view(str, send));
                     std::memcpy(&buf[len], start, std::size_t(str - start));
                     len += (str - start);
                     break;
@@ -502,7 +500,7 @@ std::pair<std::size_t, std::string_view> gen_state::gen_block(
         ps.send = v.data() + v.size();
         ps.current_line = line;
         ps.parse_block(VAL_ANY, term);
-        v = std::string_view{ps.source, ps.send};
+        v = make_str_view(ps.source, ps.send);
         ret_line = ps.current_line;
     }
     if (code.size() > (csz + 2)) {

src/cs_parser.cc

@@ -57,8 +57,7 @@ end:
     nlines = nl;
     if ((beg == end) || (*beg != '\"')) {
         throw error{
-            cs, "unfinished string '%s'",
-            std::string_view{orig, std::size_t(beg - orig)}
+            cs, "unfinished string '%.*s'", int(beg - orig), orig
         };
     }
     return ++beg;
@@ -90,18 +89,14 @@ LIBCUBESCRIPT_EXPORT char const *parse_word(
                 break;
             case '[':
                 ++it;
-                it = parse_word(cs, std::string_view{
-                    it, std::size_t(end - it)
-                });
+                it = parse_word(cs, make_str_view(it, end));
                 if ((it == end) || (*it != ']')) {
                     throw error{cs, "missing \"]\""};
                 }
                 break;
             case '(':
                 ++it;
-                it = parse_word(cs, std::string_view{
-                    it, std::size_t(end - it)
-                });
+                it = parse_word(cs, make_str_view(it, end));
                 if ((it == end) || (*it != ')')) {
                     throw error{cs, "missing \")\""};
                 }
@@ -127,7 +122,7 @@ static inline void p_set_end(
     if (!end) {
         return;
     }
-    *end = std::string_view{nbeg, nend};
+    *end = make_str_view(nbeg, nend);
 }
 /* this function assumes the input is definitely a hex digit */
 static inline integer_type p_hexd_to_int(char c) {
@@ -313,11 +308,9 @@ bool is_valid_name(std::string_view s) {
 std::string_view parser_state::get_str() {
     size_t nl;
     char const *beg = source;
-    source = parse_string(
-        *ts.pstate, std::string_view{source, std::size_t(send - source)}, nl
-    );
+    source = parse_string(*ts.pstate, make_str_view(source, send), nl);
     current_line += nl - 1;
-    auto ret = std::string_view{beg, std::size_t(source - beg)};
+    auto ret = make_str_view(beg, source);
     return ret.substr(1, ret.size() - 2);
 }
 
@@ -342,7 +335,7 @@ std::string_view parser_state::read_macro_name() {
     for (; isalnum(c) || (c == '_'); c = current()) {
         next_char();
     }
-    return std::string_view{op, std::size_t(source - op)};
+    return make_str_view(op, source);
 }
 
 /* advance the parser until we reach any of the given chars, then stop at it */
@@ -406,10 +399,8 @@ void parser_state::skip_comments() {
 
 std::string_view parser_state::get_word() {
     char const *beg = source;
-    source = parse_word(
-        *ts.pstate, std::string_view{source, std::size_t(send - source)}
-    );
-    return std::string_view{beg, std::size_t(source - beg)};
+    source = parse_word(*ts.pstate, make_str_view(source, send));
+    return make_str_view(beg, source);
 }
 
 /* lookups that are invalid but not causing an error */
@@ -718,7 +709,7 @@ void parser_state::parse_blockarg(int ltype) {
                 }
                 /* generate a block string for everything until now */
                 if (start != end) {
-                    gs.gen_val_block(std::string_view{start, end});
+                    gs.gen_val_block(make_str_view(start, end));
                     ++concs;
                 }
                 if (parse_subblock()) {
@@ -751,7 +742,7 @@ void parser_state::parse_blockarg(int ltype) {
             case VAL_COND: {
                 /* compile */
                 auto ret = gs.gen_block(
-                    std::string_view{start, send}, curline, VAL_NULL, ']'
+                    make_str_view(start, send), curline, VAL_NULL, ']'
                 );
                 source = ret.second.data();
                 send = source + ret.second.size();
@@ -759,14 +750,14 @@ void parser_state::parse_blockarg(int ltype) {
                 return;
             }
             case VAL_IDENT:
-                gs.gen_val_ident(std::string_view{start, source - 1});
+                gs.gen_val_ident(make_str_view(start, source - 1));
                 return;
             default:
-                gs.gen_val_block(std::string_view{start, source - 1});
+                gs.gen_val_block(make_str_view(start, source - 1));
                 goto done;
         }
     }
-    gs.gen_val_block(std::string_view{start, source - 1});
+    gs.gen_val_block(make_str_view(start, source - 1));
     /* concat the pieces */
     gs.gen_concat(++concs, false, ltype);
 done:

src/cs_state.hh

@@ -5,6 +5,7 @@
 
 #include <unordered_map>
 #include <string>
+#include <vector>
 
 #include "cs_bcode.hh"
 #include "cs_ident.hh"

src/cs_std.hh

@@ -93,6 +93,13 @@ struct charbuf: valbuf<char> {
     }
 };
 
+/* because the dual-iterator constructor is not supported everywhere
+ * and the pointer + size constructor is ugly as heck
+ */
+inline std::string_view make_str_view(char const *a, char const *b) {
+    return std::string_view{a, std::size_t(b - a)};
+}
+
 } /* namespace cubescript */
 
 #endif

src/cs_val.cc

@@ -392,19 +392,19 @@ LIBCUBESCRIPT_EXPORT string_ref concat_values(
         switch (vals[i].get_type()) {
             case value_type::INTEGER:
             case value_type::FLOAT:
-            case value_type::STRING:
-                std::ranges::copy(
-                    any_value{vals[i]}.force_string(cs),
-                    std::back_inserter(buf)
-                );
+            case value_type::STRING: {
+                auto val = any_value{vals[i]};
+                auto str = val.force_string(cs);
+                std::copy(str.begin(), str.end(), std::back_inserter(buf));
                 break;
+            }
             default:
                 break;
         }
         if (i == (vals.size() - 1)) {
             break;
         }
-        std::ranges::copy(sep, std::back_inserter(buf));
+        std::copy(sep.begin(), sep.end(), std::back_inserter(buf));
     }
     return string_ref{cs, buf.str()};
 }

src/lib_list.cc

@@ -202,7 +202,7 @@ LIBCUBESCRIPT_EXPORT void std_init_list(state &gcs) {
         }
         auto quote = p.get_quoted_item();
         auto *qend = &quote[quote.size()];
-        res.set_string(std::string_view{list, qend}, cs);
+        res.set_string(make_str_view(list, qend), cs);
     });
 
     new_cmd_quiet(gcs, "listfind", "rse", [](auto &cs, auto args, auto &res) {

tools/repl.cc

@@ -16,6 +16,7 @@
 #include <optional>
 #include <memory>
 #include <iterator>
+#include <string>
 
 #include <cubescript/cubescript.hh>