forked from enlightenment/efl
eina: add eina_multi_iterator_new.
This will return an Iterator that will walk over a serie of iterator. This technicaly take ownership of the iterator it is walking over and destroy as it goes and doesn't need them anymore. Reviewed-by: Vitor Sousa da Silva <vitorsousa@expertisesolutions.com.br> Differential Revision: https://phab.enlightenment.org/D7286
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@ -29,6 +29,8 @@
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#include "eina_safety_checks.h"
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#include "eina_iterator.h"
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#include "eina_list.h"
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/*============================================================================*
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* Local *
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*============================================================================*/
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@ -290,6 +292,83 @@ eina_carray_length_iterator_new(void** array, unsigned int step, unsigned int le
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return &it->iterator;
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}
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typedef struct _Eina_Iterator_Multi Eina_Multi_Iterator;
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struct _Eina_Iterator_Multi
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{
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Eina_Iterator iterator;
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Eina_List *iterators;
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};
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static Eina_Bool
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eina_multi_iterator_next(Eina_Multi_Iterator *it, void **data)
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{
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Eina_Bool r;
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if (!it->iterators)
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return EINA_FALSE;
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// Search for an iterator that do have some data
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while (!eina_iterator_next(eina_list_data_get(it->iterators), data))
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{
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eina_iterator_free(eina_list_data_get(it->iterators));
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it->iterators = eina_list_remove_list(it->iterators, it->iterators);
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if (!it->iterators) return EINA_FALSE;
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}
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return EINA_TRUE;
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}
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static void**
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eina_multi_iterator_get_container(Eina_Multi_Iterator *it)
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{
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if (!it->iterators) return NULL;
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return eina_iterator_container_get(eina_list_data_get(it->iterators));
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}
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static void
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eina_multi_iterator_free(Eina_Multi_Iterator *it)
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{
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Eina_Iterator *itc;
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EINA_LIST_FREE(it->iterators, itc)
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eina_iterator_free(itc);
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free(it);
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}
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EAPI Eina_Iterator *
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eina_multi_iterator_internal_new(Eina_Iterator *itc, ...)
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{
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Eina_Multi_Iterator *it;
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va_list args;
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it = calloc(1, sizeof (Eina_Multi_Iterator));
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if (!it) return NULL;
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EINA_MAGIC_SET(&it->iterator, EINA_MAGIC_ITERATOR);
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it->iterators = eina_list_append(it->iterators, itc);
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va_start(args, itc);
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while ((itc = (Eina_Iterator *) va_arg(args, Eina_Iterator *)))
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{
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it->iterators = eina_list_append(it->iterators, itc);
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}
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va_end(args);
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it->iterator.version = EINA_ITERATOR_VERSION;
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it->iterator.next = FUNC_ITERATOR_NEXT(eina_multi_iterator_next);
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it->iterator.get_container = FUNC_ITERATOR_GET_CONTAINER(
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eina_multi_iterator_get_container);
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it->iterator.free = FUNC_ITERATOR_FREE(eina_multi_iterator_free);
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return &it->iterator;
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}
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typedef struct {
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Eina_Iterator iterator;
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@ -349,6 +349,39 @@ EAPI Eina_Iterator *eina_carray_length_iterator_new(void** array, unsigned int s
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*/
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EAPI Eina_Iterator* eina_iterator_filter_new(Eina_Iterator *original, Eina_Each_Cb filter, Eina_Free_Cb free_cb, void *data) EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;
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/**
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* @brief Creates an Eina_Iterator that iterates through a serie
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* of Eina_Iterator.
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*
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* @param[in] it The first Eina_Iterator to iterate over
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* @return The iterator that will walk all the other iterator
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*
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* Eina_Iterator* iterator = eina_multi_iterator_new(it1, it2, it3, NULL);
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*
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* @note The returned array will destroy iterator given to it once they are not
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* necessary anymore. Taking ownership of those iterator.
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*
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* @since 1.22
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*/
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EAPI Eina_Iterator *eina_multi_iterator_internal_new(Eina_Iterator *it, ...) EINA_ARG_NONNULL(1) EINA_WARN_UNUSED_RESULT;
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/**
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* @def eina_multi_iterator_new
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* @brief Creates an Eina_Iterator that iterates through a serie
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* of Eina_Iterator.
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*
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* @param[in] it The first Eina_Iterator to iterate over
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* @return The iterator that will walk all the other iterator
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*
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* Eina_Iterator* iterator = eina_multi_iterator_new(it1, it2, it3);
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*
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* @note The returned array will destroy iterator given to it once they are not
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* necessary anymore. Taking ownership of those iterator.
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*
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* @since 1.22
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*/
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#define eina_multi_iterator_new(It, ...) eina_multi_iterator_internal_new(It, ##__VA_ARGS__, NULL)
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/**
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* @def EINA_ITERATOR_FOREACH
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* @brief Definition for the macro to iterate over all elements easily.
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