1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
|
<?php
/**
* The "Categoryfinder" class takes a list of articles, creates an internal
* representation of all their parent categories (as well as parents of
* parents etc.). From this representation, it determines which of these
* articles are in one or all of a given subset of categories.
*
* Example use :
* <code>
* # Determines whether the article with the page_id 12345 is in both
* # "Category 1" and "Category 2" or their subcategories, respectively
*
* $cf = new Categoryfinder;
* $cf->seed(
* array( 12345 ),
* array( 'Category 1', 'Category 2' ),
* 'AND'
* );
* $a = $cf->run();
* print implode( ',' , $a );
* </code>
*
*/
class Categoryfinder {
var $articles = array(); # The original article IDs passed to the seed function
var $deadend = array(); # Array of DBKEY category names for categories that don't have a page
var $parents = array(); # Array of [ID => array()]
var $next = array(); # Array of article/category IDs
var $targets = array(); # Array of DBKEY category names
var $name2id = array();
var $mode; # "AND" or "OR"
/**
* @var DatabaseBase
*/
var $dbr; # Read-DB slave
/**
* Constructor (currently empty).
*/
function __construct() {
}
/**
* Initializes the instance. Do this prior to calling run().
* @param $article_ids Array of article IDs
* @param $categories FIXME
* @param $mode String: FIXME, default 'AND'.
* @todo FIXME: $categories/$mode
*/
function seed( $article_ids, $categories, $mode = 'AND' ) {
$this->articles = $article_ids;
$this->next = $article_ids;
$this->mode = $mode;
# Set the list of target categories; convert them to DBKEY form first
$this->targets = array();
foreach ( $categories as $c ) {
$ct = Title::makeTitleSafe( NS_CATEGORY, $c );
if ( $ct ) {
$c = $ct->getDBkey();
$this->targets[$c] = $c;
}
}
}
/**
* Iterates through the parent tree starting with the seed values,
* then checks the articles if they match the conditions
* @return array of page_ids (those given to seed() that match the conditions)
*/
function run() {
$this->dbr = wfGetDB( DB_SLAVE );
while ( count( $this->next ) > 0 ) {
$this->scan_next_layer();
}
# Now check if this applies to the individual articles
$ret = array();
foreach ( $this->articles as $article ) {
$conds = $this->targets;
if ( $this->check( $article, $conds ) ) {
# Matches the conditions
$ret[] = $article;
}
}
return $ret;
}
/**
* This functions recurses through the parent representation, trying to match the conditions
* @param $id int The article/category to check
* @param $conds array The array of categories to match
* @param $path array used to check for recursion loops
* @return bool Does this match the conditions?
*/
function check( $id, &$conds, $path = array() ) {
// Check for loops and stop!
if ( in_array( $id, $path ) ) {
return false;
}
$path[] = $id;
# Shortcut (runtime paranoia): No contitions=all matched
if ( count( $conds ) == 0 ) {
return true;
}
if ( !isset( $this->parents[$id] ) ) {
return false;
}
# iterate through the parents
foreach ( $this->parents[$id] as $p ) {
$pname = $p->cl_to ;
# Is this a condition?
if ( isset( $conds[$pname] ) ) {
# This key is in the category list!
if ( $this->mode == 'OR' ) {
# One found, that's enough!
$conds = array();
return true;
} else {
# Assuming "AND" as default
unset( $conds[$pname] );
if ( count( $conds ) == 0 ) {
# All conditions met, done
return true;
}
}
}
# Not done yet, try sub-parents
if ( !isset( $this->name2id[$pname] ) ) {
# No sub-parent
continue;
}
$done = $this->check( $this->name2id[$pname], $conds, $path );
if ( $done || count( $conds ) == 0 ) {
# Subparents have done it!
return true;
}
}
return false;
}
/**
* Scans a "parent layer" of the articles/categories in $this->next
*/
function scan_next_layer() {
# Find all parents of the article currently in $this->next
$layer = array();
$res = $this->dbr->select(
/* FROM */ 'categorylinks',
/* SELECT */ '*',
/* WHERE */ array( 'cl_from' => $this->next ),
__METHOD__ . '-1'
);
foreach ( $res as $o ) {
$k = $o->cl_to;
# Update parent tree
if ( !isset( $this->parents[$o->cl_from] ) ) {
$this->parents[$o->cl_from] = array();
}
$this->parents[$o->cl_from][$k] = $o;
# Ignore those we already have
if ( in_array( $k, $this->deadend ) ) {
continue;
}
if ( isset( $this->name2id[$k] ) ) {
continue;
}
# Hey, new category!
$layer[$k] = $k;
}
$this->next = array();
# Find the IDs of all category pages in $layer, if they exist
if ( count( $layer ) > 0 ) {
$res = $this->dbr->select(
/* FROM */ 'page',
/* SELECT */ array( 'page_id', 'page_title' ),
/* WHERE */ array( 'page_namespace' => NS_CATEGORY , 'page_title' => $layer ),
__METHOD__ . '-2'
);
foreach ( $res as $o ) {
$id = $o->page_id;
$name = $o->page_title;
$this->name2id[$name] = $id;
$this->next[] = $id;
unset( $layer[$name] );
}
}
# Mark dead ends
foreach ( $layer as $v ) {
$this->deadend[$v] = $v;
}
}
}
|
