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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, TBOOX Open Source Group.
*
* @author ruki
* @file lastof.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "string_lastof"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
static tb_void_t xm_string_lastof_str(lua_State* lua, tb_char_t const* cstr, tb_size_t nstr, tb_char_t const* csubstr, tb_size_t nsubstr)
{
// find it
tb_char_t const* curr = tb_null;
tb_char_t const* next = cstr;
do
{
next = tb_strstr(next, csubstr); // faster than tb_strnstr()
if (next)
{
curr = next;
next += nsubstr;
}
} while (!next);
// found?
if (curr) lua_pushinteger(lua, curr - cstr + 1);
else lua_pushnil(lua);
}
static tb_void_t xm_string_lastof_chr(lua_State* lua, tb_char_t const* cstr, tb_size_t nstr, tb_char_t ch)
{
tb_char_t const* pos = tb_strrchr(cstr, ch); // faster than tb_strnrchr()
if (pos) lua_pushinteger(lua, pos - cstr + 1);
else lua_pushnil(lua);
}
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
/* lastof string (only support plain text)
*
* @param str the string
* @param substr the substring
*/
tb_int_t xm_string_lastof(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 substring
size_t nsubstr = 0;
tb_char_t const* csubstr = luaL_checklstring(lua, 2, &nsubstr);
// lastof it
lua_newtable(lua);
if (nsubstr == 1) xm_string_lastof_chr(lua, cstr, (tb_size_t)nstr, csubstr[0]);
else xm_string_lastof_str(lua, cstr, (tb_size_t)nstr, csubstr, nsubstr);
return 1;
}
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