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/*
* Copyright (C) 2007 Martin Willi
* Hochschule fuer Technik Rapperswil
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
/**
* @defgroup enumerator enumerator
* @{ @ingroup utils
*/
#ifndef ENUMERATOR_H_
#define ENUMERATOR_H_
typedef struct enumerator_t enumerator_t;
#include "../utils.h"
/**
* Enumerator interface, allows enumeration over collections.
*/
struct enumerator_t {
/**
* Enumerate collection.
*
* The enumerate function takes a variable argument list containing
* pointers where the enumerated values get written.
*
* @param ... variable list of enumerated items, implementation dependent
* @return TRUE if pointers returned
*/
bool (*enumerate)(enumerator_t *this, ...);
/**
* Destroy a enumerator instance.
*/
void (*destroy)(enumerator_t *this);
};
/**
* Create an enumerator which enumerates over nothing
*
* @return an enumerator over no values
*/
enumerator_t* enumerator_create_empty();
/**
* Create an enumerator which enumerates over a single item
*
* @param item item to enumerate
* @param cleanup cleanup function called on destroy with the item
* @return an enumerator over a single value
*/
enumerator_t *enumerator_create_single(void *item, void (*cleanup)(void *item));
/**
* Create an enumerator over files/subdirectories in a directory.
*
* This enumerator_t.enumerate() function returns a (to the directory) relative
* filename (as a char*), an absolute filename (as a char*) and a file status
* (to a struct stat), which all may be NULL. "." and ".." entries are
* skipped. Example:
*
* @code
char *rel, *abs;
struct stat st;
enumerator_t *e;
e = enumerator_create_directory("/tmp");
if (e)
{
while (e->enumerate(e, &rel, &abs, &st))
{
if (S_ISDIR(st.st_mode) && *rel != '.')
{
printf("%s\n", abs);
}
}
e->destroy(e);
}
@endcode
*
* @param path path of the directory
* @return the directory enumerator, NULL on failure
*/
enumerator_t* enumerator_create_directory(const char *path);
/**
* Create an enumerator over tokens of a string.
*
* Tokens are separated by one of the characters in sep and trimmed by the
* characters in trim.
*
* @param string string to parse
* @param sep separator characters
* @param trim characters to trim from tokens
* @return enumerator over char* tokens
*/
enumerator_t* enumerator_create_token(const char *string, const char *sep,
const char *trim);
/**
* Creates an enumerator which enumerates over enumerated enumerators :-).
*
* The variable argument list of enumeration values is limit to 5.
*
* @param outer outer enumerator
* @param inner_constructor constructor to inner enumerator
* @param data data to pass to each inner_constructor call
* @param destroy_data destructor to pass to data
* @return the nested enumerator
*/
enumerator_t *enumerator_create_nested(enumerator_t *outer,
enumerator_t *(*inner_constructor)(void *outer, void *data),
void *data, void (*destroy_data)(void *data));
/**
* Creates an enumerator which filters output of another enumerator.
*
* The filter function receives the user supplied "data" followed by a
* unfiltered enumeration item, followed by an output pointer where to write
* the filtered data. Then the next input/output pair follows.
* It returns TRUE to deliver the
* values to the caller of enumerate(), FALSE to filter this enumeration.
*
* The variable argument list of enumeration values is limit to 5.
*
* @param unfiltered unfiltered enumerator to wrap, gets destroyed
* @param filter filter function
* @param data user data to supply to filter
* @param destructor destructor function to clean up data after use
* @return the filtered enumerator
*/
enumerator_t *enumerator_create_filter(enumerator_t *unfiltered,
bool (*filter)(void *data, ...),
void *data, void (*destructor)(void *data));
/**
* Create an enumerator wrapper which does a cleanup on destroy.
*
* @param wrapped wrapped enumerator
* @param cleanup cleanup function called on destroy
* @param data user data to supply to cleanup
* @return the enumerator with cleanup
*/
enumerator_t *enumerator_create_cleaner(enumerator_t *wrapped,
void (*cleanup)(void *data), void *data);
#endif /** ENUMERATOR_H_ @}*/
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