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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 codes.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "utf8.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
static tb_int_t xm_utf8_codes_iter(lua_State *lua, tb_bool_t strict) {
tb_assert_and_check_return_val(lua, 0);
size_t len;
tb_char_t const* s = luaL_checklstring(lua, 1, &len);
lua_Unsigned n = (lua_Unsigned)lua_tointeger(lua, 2);
if (n < len) {
while (n < len && xm_utf8_iscontp(s + n)) {
n++; // go to next character
}
}
if (n >= len) { // (also handles original 'n' being negative)
return 0; // no more codepoints
} else {
xm_utf8_int_t code;
tb_char_t const* next = xm_utf8_decode(s + n, &code, strict);
if (next == NULL || (next < s + len && xm_utf8_iscontp(next))) {
return luaL_error(lua, XM_UTF8_MSGInvalid);
}
lua_pushinteger(lua, n + 1);
lua_pushinteger(lua, code);
return 2;
}
}
static int xm_utf8_codes_iter_strict(lua_State *lua) {
return xm_utf8_codes_iter(lua, tb_true);
}
static int xm_utf8_codes_iter_lax(lua_State *lua) {
return xm_utf8_codes_iter(lua, tb_false);
}
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
tb_int_t xm_utf8_codes(lua_State *lua) {
tb_bool_t lax = lua_toboolean(lua, 2);
tb_char_t const* s = luaL_checkstring(lua, 1);
luaL_argcheck(lua, !xm_utf8_iscontp(s), 1, XM_UTF8_MSGInvalid);
lua_pushcfunction(lua, lax ? xm_utf8_codes_iter_lax : xm_utf8_codes_iter_strict);
lua_pushvalue(lua, 1);
lua_pushinteger(lua, 0);
return 3;
}
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