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/* MIT License
*
* Copyright (c) 2022 Tyge Løvset, NORCE, www.norceresearch.no
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
/*
#include <stdio.h>
#define i_val int
#include <stc/cstack.h>
#include <stc/algo/filter.h>
int main()
{
c_WITH (cstack_int stk = {0}, cstack_int_drop(&stk)) {
c_FORLIST (i, int, {1, 2, 3, 4, 5, 6, 7, 8, 9})
cstack_int_push(&stk, i);
c_FOREACH (i, cstack_int, stk)
printf(" %d", *i.ref);
puts("");
c_FORFILTER (i, cstack_int, stk
, c_flt_skipwhile(i, *i.ref < 3)
&& (*i.ref & 1) == 0 // even only
, c_flt_take(i, 2)) // break after 2
printf(" %d", *i.ref);
puts("");
}
}
*/
#ifndef STC_FILTER_H_INCLUDED
#define STC_FILTER_H_INCLUDED
#include <stc/ccommon.h>
#ifndef c_NFILTERS
#define c_NFILTERS 14 /* 22, 30, .. */
#endif
#define c_flt_take(i, n) (++(i).s1[(i).s1top++] <= (n))
#define c_flt_skip(i, n) (++(i).s1[(i).s1top++] > (n))
#define c_flt_skipwhile(i, pred) ((i).s2[(i).s2top++] |= !(pred))
#define c_flt_takewhile(i, pred) !c_flt_skipwhile(i, pred)
#define c_forfilter(...) c_MACRO_OVERLOAD(c_forfilter, __VA_ARGS__)
#define c_forfilter4(i, C, cnt, filter) \
c_forfilter_b(i, C, C##_begin(&cnt), filter)
#define c_forfilter5(i, C, cnt, filter, cond) \
c_forfilter_b(i, C, C##_begin(&cnt), filter) if (!(cond)) break; else
#define c_forfilter_b(i, C, start, filter) \
for (struct {C##_iter it; C##_value *ref; \
uint32_t s1[c_NFILTERS], index, count; \
bool s2[c_NFILTERS]; uint8_t s1top, s2top;} \
i = {.it=start, .ref=i.it.ref}; i.it.ref \
; C##_next(&i.it), i.ref = i.it.ref, ++i.index, i.s1top=0, i.s2top=0) \
if (!((filter) && ++i.count)) ; else
#endif
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