summaryrefslogtreecommitdiff
path: root/includes/Message.php
blob: 87349ff5fa10c16e269b975019cef26d7e8b36a8 (plain)
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
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
<?php
/**
 * This class provides methods for fetching interface messages and
 * processing them into variety of formats that are needed in MediaWiki.
 *
 * It is intented to replace the old wfMsg* functions that over time grew
 * unusable.
 *
 * Examples:
 * Fetching a message text for interface message
 *    $button = Xml::button( wfMessage( 'submit' )->text() );
 * </pre>
 * Messages can have parameters:
 *    wfMessage( 'welcome-to' )->params( $wgSitename )->text(); 
 *        {{GRAMMAR}} and friends work correctly
 *    wfMessage( 'are-friends', $user, $friend );
 *    wfMessage( 'bad-message' )->rawParams( '<script>...</script>' )->escaped();
 * </pre>
 * Sometimes the message text ends up in the database, so content language is needed.
 *    wfMessage( 'file-log', $user, $filename )->inContentLanguage()->text()
 * </pre>
 * Checking if message exists:
 *    wfMessage( 'mysterious-message' )->exists()
 * </pre>
 * If you want to use a different language:
 *    wfMessage( 'email-header' )->inLanguage( $user->getOption( 'language' ) )->plain()
 *        Note that you cannot parse the text except in the content or interface
 *        languages
 * </pre>
 *
 *
 * Comparison with old wfMsg* functions:
 *
 * Use full parsing.
 *     wfMsgExt( 'key', array( 'parseinline' ), 'apple' );
 *     === wfMessage( 'key', 'apple' )->parse();
 * </pre>
 * Parseinline is used because it is more useful when pre-building html.
 * In normal use it is better to use OutputPage::(add|wrap)WikiMsg.
 *
 * Places where html cannot be used. {{-transformation is done.
 *     wfMsgExt( 'key', array( 'parsemag' ), 'apple', 'pear' );
 *     === wfMessage( 'key', 'apple', 'pear' )->text();
 * </pre>
 *
 * Shortcut for escaping the message too, similar to wfMsgHTML, but
 * parameters are not replaced after escaping by default.
 * $escaped = wfMessage( 'key' )->rawParams( 'apple' )->escaped();
 * </pre>
 *
 * @todo
 * - test, can we have tests?
 *
 * @since 1.17
 * @author Niklas Laxström
 */
class Message {
	/**
	 * In which language to get this message. True, which is the default,
	 * means the current interface language, false content language.
	 */
	protected $interface = true;
	
	/**
	 * In which language to get this message. Overrides the $interface
	 * variable.
	 *
	 * @var Language
	 */
	protected $language = null;
	
	/**
	 * The message key.
	 */
	protected $key;

	/**
	 * List of parameters which will be substituted into the message.
	 */
	protected $parameters = array();

	/**
	 * Format for the message.
	 * Supported formats are:
	 * * text (transform)
	 * * escaped (transform+htmlspecialchars)
	 * * block-parse
	 * * parse (default)
	 * * plain
	 */
	protected $format = 'parse';

	/**
	 * Whether database can be used.
	 */
	protected $useDatabase = true;

	/**
	 * Title object to use as context
	 */
	protected $title = null;

	/**
	 * Constructor.
	 * @param $key: message key, or array of message keys to try and use the first non-empty message for
	 * @param $params Array message parameters
	 * @return Message: $this
	 */
	public function __construct( $key, $params = array() ) {
		global $wgLang;
		$this->key = $key;
		$this->parameters = array_values( $params );
		$this->language = $wgLang;
	}

	/**
	 * Factory function that is just wrapper for the real constructor. It is
	 * intented to be used instead of the real constructor, because it allows
	 * chaining method calls, while new objects don't.
	 * @param $key String: message key
	 * @param Varargs: parameters as Strings
	 * @return Message: $this
	 */
	public static function newFromKey( $key /*...*/ ) {
		$params = func_get_args();
		array_shift( $params );
		return new self( $key, $params );
	}

	/**
	 * Factory function accepting multiple message keys and returning a message instance
	 * for the first message which is non-empty. If all messages are empty then an
	 * instance of the first message key is returned.
	 * @param Varargs: message keys
	 * @return Message: $this
	 */
	public static function newFallbackSequence( /*...*/ ) {
		$keys = func_get_args();
		if ( func_num_args() == 1 ) {
			if ( is_array($keys[0]) ) {
				// Allow an array to be passed as the first argument instead
				$keys = array_values($keys[0]);
			} else {
				// Optimize a single string to not need special fallback handling
				$keys = $keys[0];
			}
		}
		return new self( $keys );
	}

	/**
	 * Adds parameters to the parameter list of this message.
	 * @param Varargs: parameters as Strings
	 * @return Message: $this
	 */
	public function params( /*...*/ ) {
		$args = func_get_args();
		if ( isset( $args[0] ) && is_array( $args[0] ) ) {
			$args = $args[0];
		}
		$args_values = array_values( $args );
		$this->parameters = array_merge( $this->parameters, $args_values );
		return $this;
	}

	/**
	 * Add parameters that are substituted after parsing or escaping.
	 * In other words the parsing process cannot access the contents
	 * of this type of parameter, and you need to make sure it is
	 * sanitized beforehand.  The parser will see "$n", instead.
	 * @param Varargs: raw parameters as Strings
	 * @return Message: $this
	 */
	public function rawParams( /*...*/ ) {
		$params = func_get_args();
		if ( isset( $params[0] ) && is_array( $params[0] ) ) {
			$params = $params[0];
		}
		foreach( $params as $param ) {
			$this->parameters[] = self::rawParam( $param );
		}
		return $this;
	}
	
	/**
	 * Add parameters that are numeric and will be passed through
	 * Language::formatNum before substitution
	 * @param Varargs: numeric parameters
	 * @return Message: $this
	 */
	public function numParams( /*...*/ ) {
		$params = func_get_args();
		if ( isset( $params[0] ) && is_array( $params[0] ) ) {
			$params = $params[0];
		}
		foreach( $params as $param ) {
			$this->parameters[] = self::numParam( $param );
		}
		return $this;
	}
	
	/**
	 * Request the message in any language that is supported.
	 * As a side effect interface message status is unconditionally
	 * turned off.
	 * @param $lang Mixed: language code or Language object.
	 * @return Message: $this
	 */
	public function inLanguage( $lang ) {
		if ( $lang instanceof Language || $lang instanceof StubUserLang ) {
			$this->language = $lang;
		} elseif ( is_string( $lang ) ) {
			if( $this->language->getCode() != $lang ) {
				$this->language = Language::factory( $lang );
			}
		} else {
			$type = gettype( $lang );
			throw new MWException( __METHOD__ . " must be "
				. "passed a String or Language object; $type given" 
			);
		}
		$this->interface = false;
		return $this;
	}

	/**
	 * Request the message in the wiki's content language,
	 * unless it is disabled for this message.
	 * @see $wgForceUIMsgAsContentMsg
	 * @return Message: $this
	 */
	public function inContentLanguage() {
		global $wgForceUIMsgAsContentMsg;
		if ( in_array( $this->key, (array)$wgForceUIMsgAsContentMsg ) ) {
			return $this;
		}

		global $wgContLang;
		$this->interface = false;
		$this->language = $wgContLang;
		return $this;
	}

	/**
	 * Enable or disable database use.
	 * @param $value Boolean
	 * @return Message: $this
	 */
	public function useDatabase( $value ) {
		$this->useDatabase = (bool) $value;
		return $this;
	}

	/**
	 * Set the Title object to use as context when transforming the message
	 *
	 * @param $title Title object
	 * @return Message: $this
	 */
	public function title( $title ) {
		$this->title = $title;
		return $this;
	}

	/**
	 * Returns the message parsed from wikitext to HTML.
	 * @return String: HTML
	 */
	public function toString() {
		$string = $this->getMessageText();
		
		# Replace parameters before text parsing
		$string = $this->replaceParameters( $string, 'before' );
		
		# Maybe transform using the full parser
		if( $this->format === 'parse' ) {
			$string = $this->parseText( $string );
			$m = array();
			if( preg_match( '/^<p>(.*)\n?<\/p>\n?$/sU', $string, $m ) ) {
				$string = $m[1];
			}
		} elseif( $this->format === 'block-parse' ){
			$string = $this->parseText( $string );
		} elseif( $this->format === 'text' ){
			$string = $this->transformText( $string );
		} elseif( $this->format === 'escaped' ){
			$string = $this->transformText( $string );
			$string = htmlspecialchars( $string, ENT_QUOTES, 'UTF-8', false );
		}
		
		# Raw parameter replacement
		$string = $this->replaceParameters( $string, 'after' );
		
		return $string;
	}

	/**
	 * Magic method implementation of the above (for PHP >= 5.2.0), so we can do, eg:
	 *     $foo = Message::get($key);
	 *     $string = "<abbr>$foo</abbr>";
	 * @return String
	 */
	public function __toString() {
		return $this->toString();
	}
	
	/**
	 * Fully parse the text from wikitext to HTML
	 * @return String parsed HTML
	 */
	public function parse() {
		$this->format = 'parse';
		return $this->toString();
	}

	/**
	 * Returns the message text. {{-transformation is done.
	 * @return String: Unescaped message text.
	 */
	public function text() {
		$this->format = 'text';
		return $this->toString();
	}

	/**
	 * Returns the message text as-is, only parameters are subsituted.
	 * @return String: Unescaped untransformed message text.
	 */
	public function plain() {
		$this->format = 'plain';
		return $this->toString();
	}

	/**
	 * Returns the parsed message text which is always surrounded by a block element.
	 * @return String: HTML
	 */
	public function parseAsBlock() {
		$this->format = 'block-parse';
		return $this->toString();
	}

	/**
	 * Returns the message text. {{-transformation is done and the result
	 * is escaped excluding any raw parameters.
	 * @return String: Escaped message text.
	 */
	public function escaped() {
		$this->format = 'escaped';
		return $this->toString();
	}

	/**
	 * Check whether a message key has been defined currently.
	 * @return Bool: true if it is and false if not.
	 */
	public function exists() {
		return $this->fetchMessage() !== false;
	}

	/**
	 * Check whether a message does not exist, or is an empty string
	 * @return Bool: true if is is and false if not
	 * @todo FIXME: Merge with isDisabled()?
	 */
	public function isBlank() {
		$message = $this->fetchMessage();
		return $message === false || $message === '';
	}

	/**
	 * Check whether a message does not exist, is an empty string, or is "-"
	 * @return Bool: true if is is and false if not
	 */
	public function isDisabled() {
		$message = $this->fetchMessage();
		return $message === false || $message === '' || $message === '-';
	}

	/**
	 * @param $value
	 * @return array
	 */
	public static function rawParam( $value ) {
		return array( 'raw' => $value );
	}

	/**
	 * @param $value
	 * @return array
	 */
	public static function numParam( $value ) {
		return array( 'num' => $value );
	}

	/**
	 * Substitutes any paramaters into the message text.
	 * @param $message String: the message text
	 * @param $type String: either before or after
	 * @return String
	 */
	protected function replaceParameters( $message, $type = 'before' ) {
		$replacementKeys = array();
		foreach( $this->parameters as $n => $param ) {
			list( $paramType, $value ) = $this->extractParam( $param );
			if ( $type === $paramType ) {
				$replacementKeys['$' . ($n + 1)] = $value;
			}
		}
		$message = strtr( $message, $replacementKeys );
		return $message;
	}

	/**
	 * Extracts the parameter type and preprocessed the value if needed.
	 * @param $param String|Array: Parameter as defined in this class.
	 * @return Tuple(type, value)
	 * @throws MWException
	 */
	protected function extractParam( $param ) {
		if ( is_array( $param ) && isset( $param['raw'] ) ) {
			return array( 'after', $param['raw'] );
		} elseif ( is_array( $param ) && isset( $param['num'] ) ) {
			// Replace number params always in before step for now.
			// No support for combined raw and num params
			return array( 'before', $this->language->formatNum( $param['num'] ) );
		} elseif ( !is_array( $param ) ) {
			return array( 'before', $param );
		} else {
			throw new MWException( "Invalid message parameter" );
		}
	}

	/**
	 * Wrapper for what ever method we use to parse wikitext.
	 * @param $string String: Wikitext message contents
	 * @return string Wikitext parsed into HTML
	 */
	protected function parseText( $string ) {
		return MessageCache::singleton()->parse( $string, $this->title, /*linestart*/true, $this->interface, $this->language )->getText();
	}

	/**
	 * Wrapper for what ever method we use to {{-transform wikitext.
	 * @param $string String: Wikitext message contents
	 * @return string Wikitext with {{-constructs replaced with their values.
	 */
	protected function transformText( $string ) {
		return MessageCache::singleton()->transform( $string, $this->interface, $this->language, $this->title );
	}

	/**
	 * Returns the textual value for the message.
	 * @return Message contents or placeholder
	 */
	protected function getMessageText() {
		$message = $this->fetchMessage();
		if ( $message === false ) {
			return '&lt;' . htmlspecialchars( is_array($this->key) ? $this->key[0] : $this->key ) . '&gt;';
		} else {
			return $message;
		}
	}

	/**
	 * Wrapper for what ever method we use to get message contents
	 *
	 * @return string
	 */
	protected function fetchMessage() {
		if ( !isset( $this->message ) ) {
			$cache = MessageCache::singleton();
			if ( is_array($this->key) ) {
				foreach ( $this->key as $key ) {
					$message = $cache->get( $key, $this->useDatabase, $this->language );
					if ( $message !== false && $message !== '' ) {
						break;
					}
				}
				$this->message = $message;
			} else {
				$this->message = $cache->get( $this->key, $this->useDatabase, $this->language );
			}
		}
		return $this->message;
	}

}