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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 codepoint.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "utf8.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
static tb_bool_t xm_utf8_codepoint_cb(xm_utf8_int_t code, tb_cpointer_t udata) {
lua_State* lua = (lua_State*)udata;
tb_assert_and_check_return_val(lua, tb_false);
lua_pushinteger(lua, code);
return tb_true;
}
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
/* codepoint(s, [i, [j [, lax]]]) -> returns codepoints for all
* characters that start in the range [i,j]
*/
tb_int_t xm_utf8_codepoint(lua_State *lua) {
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 pose = xm_utf8_posrelat((tb_long_t)luaL_optinteger(lua, 3, posi), len);
tb_bool_t lax = lua_toboolean(lua, 4);
luaL_argcheck(lua, posi >= 1, 2, "out of bounds");
luaL_argcheck(lua, pose <= (lua_Integer)len, 3, "out of bounds");
if (posi > pose) {
return 0; // empty interval; return no values
}
if (pose - posi >= INT_MAX) { // (lua_Integer -> int) overflow?
return luaL_error(lua, "string slice too long");
}
tb_int_t n = (tb_int_t)(pose - posi) + 1;
luaL_checkstack(lua, n, "string slice too long");
int nresults = lua_gettop(lua);
if (!xm_utf8_codepoint_impl(s, len, (tb_long_t)posi, (tb_long_t)pose, !lax, xm_utf8_codepoint_cb, lua)) {
return luaL_error(lua, XM_UTF8_MSGInvalid);
}
return lua_gettop(lua) - nresults;
}
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