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