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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 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;
}
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