improve string.split

1 files changed, 132 insertions, 0 deletions

diff --git a/core/src/xmake/string/split.c b/core/src/xmake/string/split.c
new file mode 100644
index 000000000..7954caab3
--- /dev/null
+++ b/core/src/xmake/string/split.c
@@ -0,0 +1,132 @@
+/*!A cross-platform build utility based on Lua
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * Copyright (C) 2015-2020, TBOOX Open Source Group.
+ *
+ * @author      ruki
+ * @file        split.c
+ *
+ */
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * trace
+ */
+#define TB_TRACE_MODULE_NAME                "string_split"
+#define TB_TRACE_MODULE_DEBUG               (0)
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * includes
+ */
+#include "prefix.h"
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * private implementation
+ */
+static tb_void_t xm_string_split_str(lua_State* lua, tb_char_t const* cstr, tb_size_t nstr, tb_char_t const* cdls, tb_size_t ndls, tb_bool_t strict, tb_int_t limit)
+{
+    tb_int_t num = 0;
+    tb_char_t const* end = cstr + nstr;
+    tb_char_t const* pos = tb_strstr(cstr, cdls); // faster than tb_strnstr()
+    while (pos && pos < end)
+    {
+        if (pos > cstr || strict)
+        {
+            if (limit > 0 && num + 1 >= limit)
+                break;
+
+            lua_pushlstring(lua, cstr, pos - cstr);
+            lua_rawseti(lua, -2, ++num);
+        }
+
+        cstr = pos + ndls;
+        pos = tb_strstr(cstr, cdls);
+    }
+    if (cstr < end)
+    {
+        lua_pushlstring(lua, cstr, end - cstr);
+        lua_rawseti(lua, -2, ++num);
+    }
+    else if (strict && (limit < 0 || num < limit) && cstr == end)
+    {
+        lua_pushliteral(lua, "");
+        lua_rawseti(lua, -2, ++num);
+    }
+}
+static tb_void_t xm_string_split_chr(lua_State* lua, tb_char_t const* cstr, tb_size_t nstr, tb_char_t ch, tb_bool_t strict, tb_int_t limit)
+{
+    tb_int_t num = 0;
+    tb_char_t const* end = cstr + nstr;
+    tb_char_t const* pos = tb_strchr(cstr, ch); // faster than tb_strnchr()
+    while (pos && pos < end)
+    {
+        if (pos > cstr || strict)
+        {
+            if (limit > 0 && num + 1 >= limit)
+                break;
+
+            lua_pushlstring(lua, cstr, pos - cstr);
+            lua_rawseti(lua, -2, ++num);
+        }
+
+        cstr = pos + 1;
+        pos = tb_strchr(cstr, ch);
+    }
+    if (cstr < end)
+    {
+        lua_pushlstring(lua, cstr, end - cstr);
+        lua_rawseti(lua, -2, ++num);
+    }
+    else if (strict && (limit < 0 || num < limit) && cstr == end)
+    {
+        lua_pushliteral(lua, "");
+        lua_rawseti(lua, -2, ++num);
+    }
+}
+
+/* //////////////////////////////////////////////////////////////////////////////////////
+ * implementation
+ */
+
+/* split string (only support plain text)
+ *
+ * @param str             the string
+ * @param delimiter       the delimiter
+ * @param strict          is strict?
+ * @param limit           the limit count
+ */
+tb_int_t xm_string_split(lua_State* lua)
+{
+    // check
+    tb_assert_and_check_return_val(lua, 0);
+
+    // get string
+    size_t           nstr = 0;
+    tb_char_t const* cstr = luaL_checklstring(lua, 1, &nstr);
+
+    // get delimiter
+    size_t           ndls = 0;
+    tb_char_t const* cdls = luaL_checklstring(lua, 2, &ndls);
+
+    // is strict?
+    tb_bool_t const  strict = (tb_bool_t)lua_toboolean(lua, 3);
+
+    // get limit count
+    tb_int_t const   limit  = (tb_int_t)luaL_optinteger(lua, 4, -1);
+
+    // split it
+    lua_newtable(lua);
+    if (ndls == 1) xm_string_split_chr(lua, cstr, (tb_size_t)nstr, cdls[0], strict, limit);
+    else xm_string_split_str(lua, cstr, (tb_size_t)nstr, cdls, ndls, strict, limit);
+    return 1;
+}