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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 char.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "utf8.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
static void xm_utf8_char_push(lua_State *lua, tb_int_t arg) {
lua_Unsigned code = (lua_Unsigned)luaL_checkinteger(lua, arg);
luaL_argcheck(lua, code <= XM_UTF8_MAXUTF, arg, "value out of range");
tb_char_t buf[8];
tb_size_t n = xm_utf8_encode(buf, (xm_utf8_int_t)code);
if (n > 0) {
lua_pushlstring(lua, buf, n);
} else {
luaL_error(lua, "value out of range");
}
}
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
/* utfchar(n1, n2, ...) -> char(n1)..char(n2)...
*/
tb_int_t xm_utf8_char(lua_State *lua) {
tb_assert_and_check_return_val(lua, 0);
tb_int_t n = lua_gettop(lua); // number of arguments
if (n == 1) { // optimize common case of single char
xm_utf8_char_push(lua, 1);
} else {
tb_int_t i;
luaL_Buffer b;
luaL_buffinit(lua, &b);
for (i = 1; i <= n; i++) {
xm_utf8_char_push(lua, i);
luaL_addvalue(&b);
}
luaL_pushresult(&b);
}
return 1;
}
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