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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 OpportunityLiu
* @file trim.c
*
*/
/* //////////////////////////////////////////////////////////////////////////////////////
* trace
*/
#define TB_TRACE_MODULE_NAME "string_trim"
#define TB_TRACE_MODULE_DEBUG (0)
/* //////////////////////////////////////////////////////////////////////////////////////
* includes
*/
#include "prefix.h"
/* //////////////////////////////////////////////////////////////////////////////////////
* private implementation
*/
static tb_void_t xm_string_trim_space(tb_char_t const** psstr, tb_char_t const** pestr, tb_int_t mode)
{
// check
tb_assert(psstr && pestr && *psstr && *pestr);
tb_char_t const* p = *psstr;
tb_char_t const* e = *pestr;
// trim left?
if (mode <= 0)
while (p < e && tb_isspace(*p))
p++;
// trim right
if (mode >= 0)
{
e--;
while (e >= p && tb_isspace(*e))
e--;
e++;
}
// save trimed string
*psstr = p;
*pestr = e;
}
static tb_char_t const* xm_string_ltrim(tb_char_t const* sstr, tb_char_t const* estr, tb_char_t const* ctrim, size_t ntrim)
{
// check
tb_assert(sstr && estr && ctrim);
tb_char_t const* p = sstr;
while (p < estr && tb_strnchr(ctrim, ntrim, *p))
p++;
return p;
}
static tb_char_t const* xm_string_rtrim(tb_char_t const* sstr, tb_char_t const* estr, tb_char_t const* ctrim, size_t ntrim)
{
// check
tb_assert(sstr && estr && ctrim);
tb_char_t const* p = estr - 1;
while (p >= sstr && tb_strnchr(ctrim, ntrim, *p))
p--;
return p + 1;
}
/* //////////////////////////////////////////////////////////////////////////////////////
* implementation
*/
/* trim string
*
* @param str the string
* @param trimchars the chars to trim
* @param trimtype 0 to trim left and right, -1 to trim left, 1 to trim right
*
* @code
* local result = string.trim(str, "\r\n \v\t", 0)
* local result = string.trim(str, "(", -1)
* @endcode
*/
tb_int_t xm_string_trim(lua_State* lua)
{
// check
tb_assert_and_check_return_val(lua, 0);
size_t lstr, ltrim;
tb_char_t const* sstr = luaL_checklstring(lua, 1, &lstr);
tb_char_t const* estr = sstr + lstr;
tb_char_t const* trimchars = luaL_optlstring(lua, 2, "", <rim);
tb_int_t const trimtype = (tb_int_t)luaL_optinteger(lua, 3, 0);
do
{
tb_assert_and_check_break(sstr && trimchars);
tb_check_break(lstr != 0);
tb_char_t const* const rsstr = sstr;
tb_char_t const* const restr = estr;
if (ltrim == 0)
xm_string_trim_space(&sstr, &estr, trimtype);
else
{
// trim chars
if (trimtype <= 0) sstr = xm_string_ltrim(sstr, estr, trimchars, ltrim);
if (trimtype >= 0) estr = xm_string_rtrim(sstr, estr, trimchars, ltrim);
}
// no trimed chars
tb_check_break(sstr != rsstr || estr != restr);
// ok
lua_pushlstring(lua, sstr, estr - sstr);
return 1;
} while (0);
// return orignal value
lua_settop(lua, 1);
return 1;
}
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