/usr/include/ncbi-vdb/klib/trie.h is in libncbi-vdb-dev 2.8.1+dfsg-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* PUBLIC DOMAIN NOTICE
* National Center for Biotechnology Information
*
* This software/database is a "United States Government Work" under the
* terms of the United States Copyright Act. It was written as part of
* the author's official duties as a United States Government employee and
* thus cannot be copyrighted. This software/database is freely available
* to the public for use. The National Library of Medicine and the U.S.
* Government have not placed any restriction on its use or reproduction.
*
* Although all reasonable efforts have been taken to ensure the accuracy
* and reliability of the software and data, the NLM and the U.S.
* Government do not and cannot warrant the performance or results that
* may be obtained by using this software or data. The NLM and the U.S.
* Government disclaim all warranties, express or implied, including
* warranties of performance, merchantability or fitness for any particular
* purpose.
*
* Please cite the author in any work or product based on this material.
*
* ===========================================================================
*
*/
#ifndef _h_klib_trie_
#define _h_klib_trie_
#ifndef _h_klib_extern_
#include <klib/extern.h>
#endif
#ifndef _h_klib_container_
#include <klib/container.h>
#endif
#ifndef _h_klib_text_
#include <klib/text.h>
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*--------------------------------------------------------------------------
* TNode
* a node within trie
*/
typedef struct TNode TNode;
struct TNode
{
BSTNode n;
String key;
};
/* TNodeMake
* creates a TNode of variable size
*
* "n" will contain the returned node
*
* "size" must be at least the size of a TNode
*/
KLIB_EXTERN rc_t CC TNodeMake ( TNode **n, size_t size );
/* TNodeWhack
* performs final whacking of node
*/
KLIB_EXTERN void CC TNodeWhack ( TNode *self );
/*--------------------------------------------------------------------------
* Trie
* a tree of text nodes
*
* this is a collection of { key, value } pairs, where a many-value
* to one key paradigm is naturally supported, as in the b-tree.
*
* the desired insertion operations are:
* a) key -> value
* b) key -> { value, ... }
*
* the desired retrieval operations are:
* a) key -> value
* b) key -> { value, ... }
* c) RE -> key : value
* d) RE -> { key : value, ... }
* e) iteration across { key : value, ... }
*
* the reverse retrieval operation is externally managed by virtue of
* externalization of the TNode, which bundles together key and value.
* any external mechanism allowing access to the TNode will perform a
* reverse lookup.
*/
typedef struct Trie Trie;
struct Trie
{
/* root node in the tree */
struct TTrans *root;
/* forward and reverse UTF-32 character maps */
const uint16_t *map;
const uint32_t *rmap;
/* range of acceptable UTF-32 input characters */
uint32_t first_char;
uint32_t last_char;
/* width of transition array */
uint16_t width;
/* limit to the number of values */
uint16_t limit;
/* automatically expand character set */
uint8_t cs_expand;
#if _DEBUGGING
/* post-validate tree after every insert */
uint8_t validate;
uint8_t align1 [ 2 ];
#else
uint8_t align1 [ 3 ];
#endif
};
/* TrieInit
* initialize a text-tree structure
*
* "accept" [ IN ] - a character-set string where each character
* represents itself. the only exception is the '-' character,
* which - when sandwiched between two other characters - is
* interpreted en tot as a range expression. an example would be
* "-0-9" is identical to "-0123456789"
*
* "limit" [ IN ] - sets the number of values to be accumulated in
* any container. if this limit would be exceeded by any insertion,
* the node is expanded and its values are re-distributed among
* its children.
*
* "cs_expand" [ IN ] - if true, then any valid characters observed
* during insertions are automatically added to the accept character
* set. doing so will ensure that there are no ambiguous transitions.
*
* returns status codes:
* EINVAL => an invalid parameter
* ENOMEM => failed to allocate internal structures
*/
KLIB_EXTERN rc_t CC TrieInit ( Trie *tt, const char *accept,
uint32_t limit, bool cs_expand );
/* TrieInsert
* inserts an item into tree
*
* "item" [ IN ] - a TNode forming the { key, value } pair.
*
* returns status codes:
* EINVAL => an invalid parameter
* ENOMEM => failed to allocate internal structures
*/
KLIB_EXTERN rc_t CC TrieInsert ( Trie *self, TNode *item );
/* TrieInsertUnique
* behaves like TrieInsert if the key does not already have an
* associated value. fails otherwise, returning the existing node.
*
* "item" [ IN ] - { key, value } pair
*
* "exist" [ OUT, NULL OKAY ] - return parameter for existing node
* if insert failed due to unique constraint. NULL otherwise.
*
* returns status codes:
* EINVAL => an invalid parameter
* EEXIST => the key is already bound to a value
* ENOMEM => failed to allocate internal structures
*/
KLIB_EXTERN rc_t CC TrieInsertUnique ( Trie *self, TNode *item, TNode **exist );
/* TrieUnlink
* remove an object from the tree
*
* "item" [ IN ] - an actual TNode presumed to be held within tree.
*
* return value:
* true => node belonged to tree and was removed
* false => node does not belong to tree
*/
KLIB_EXTERN bool CC TrieUnlink ( Trie *self, TNode *item );
/* TrieValidate
* run validation check on tree structure
*
* return status codes:
* ?
*
* TEMPORARY
*/
#if 0
KLIB_EXTERN int CC TrieValidate ( const Trie *self );
#endif
/* TrieFind
* TrieFindRE
* find a single object within tree
*
* "key" [ IN ] - an exact match text string
*
* "re" [ IN ] - a regular expression string
*
* return value:
* NULL => no match
* TNode* => arbitrarily chosen matching node
*/
KLIB_EXTERN TNode* CC TrieFind ( const Trie *self, const String *key );
#if 0
KLIB_EXTERN TNode* CC TrieFindRE ( const Trie *self, const String *re );
#endif
/* TrieFindAll
* TrieFindAllRE
* find multiple objects within tree
*
* "key" [ IN ] - an exact match text string
*
* "re" [ IN ] - a regular expression string
*
* "buffer" [ OUT ] and "capacity" [ IN ] - a user-supplied
* array of TNode* with a capacity of "capacity" elements.
* if successful, the entire found set will be returned unordered within.
*
* "num_found" [ OUT ] - indicates the size of the found set,
* regardless of return value, such that if the supplied
* buffer were to be too small, the required size is returned.
*
* returns status codes:
* EINVAL => an invalid parameter
* ENOENT => the found set was empty
* ENOBUFS => the found set was too large
*/
KLIB_EXTERN rc_t CC TrieFindAll ( const Trie *self, const String *key,
TNode *buffer [], uint32_t capacity, uint32_t *num_found );
#if 0
KLIB_EXTERN rc_t CC TrieFindAllRE ( const Trie *self, const String *re,
TNode *buffer [], uint32_t capacity, uint32_t *num_found );
#endif
/* TrieForEach
* executes a function on each tree element
*
* "f" [ IN ] and "data" [ IN ] - iteration callback function for
* examining each TNode in the tree
*/
KLIB_EXTERN void CC TrieForEach ( const Trie *self,
void ( CC * f ) ( TNode *n, void *data ), void *data );
/* TrieDoUntil
* executes a function on each tree element
* until the function returns true
*
* "f" [ IN ] and "data" [ IN ] - iteration callback function for
* examining each TNode in the tree. the function returns "true"
* to halt iteration.
*
* return values:
* the last value returned by "f" or false if never invoked
*/
KLIB_EXTERN bool CC TrieDoUntil ( const Trie *self,
bool ( CC * f ) ( TNode *n, void *data ), void *data );
/* TrieExplore
* executes a function on each element in the path of the key
* from furthest node to closest node
* until the function returns true or end of chain
*/
KLIB_EXTERN bool CC TrieExplore ( const Trie *self, const String *key,
bool ( CC * f ) ( TNode *n, void *data ), void *data );
/* TrieWhack
* tears down internal structure
*
* "whack" [ IN, NULL OKAY ] and "data" [ IN ] - optional function
* to be invoked on TNode objects contained within. if NULL, the
* nodes will be whacked via "TNodeWhack"
*/
KLIB_EXTERN void CC TrieWhack ( Trie *self,
void ( CC * whack ) ( TNode *n, void *data ), void *data );
#ifdef __cplusplus
}
#endif
#endif /* _h_klib_trie_ */
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