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/*!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-present, Xmake Open Source Community.
*
* @author ruki
* @file len.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "utf8.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
/* utf8len(s [, i [, j [, lax]]]) --> number of characters that
* start in the range [i,j], or nil + current position if 's' is not
* well formed in that interval
*/
tb_int_t xm_utf8_len(lua_State *lua) {
tb_assert_and_check_return_val(lua, 0);
size_t len;
tb_char_t const* s = luaL_checklstring(lua, 1, &len);
lua_Integer posi = xm_utf8_posrelat((tb_long_t)luaL_optinteger(lua, 2, 1), len);
lua_Integer posj = xm_utf8_posrelat((tb_long_t)luaL_optinteger(lua, 3, -1), len);
tb_bool_t lax = lua_toboolean(lua, 4);
luaL_argcheck(lua, 1 <= posi && --posi <= (lua_Integer)len, 2, "initial position out of bounds");
luaL_argcheck(lua, --posj < (lua_Integer)len, 3, "final position out of bounds");
tb_size_t errpos = 0;
tb_long_t n = xm_utf8_len_impl(s, len, (tb_long_t)posi + 1, (tb_long_t)posj + 1, !lax, &errpos);
if (n < 0) {
lua_pushnil(lua);
lua_pushinteger(lua, errpos);
return 2;
}
lua_pushinteger(lua, n);
return 1;
}
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