Format Image metadata values into a human readable form. More...

Inheritance diagram for FormatMetadata:

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Collaboration diagram for FormatMetadata:

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Public Member Functions
	collapseContactInfo ( $vals)
	Format the contact info field into a single value.

	fetchExtendedMetadata (File $file)
	Get an array of extended metadata.

	flattenArrayReal ( $vals, $type='ul', $noHtml=false)
	A function to collapse multivalued tags into a single value.

	makeFormattedData ( $tags)
	Numbers given by Exif user agents are often magical, that is they should be replaced by a detailed explanation depending on their value which most of the time are plain integers.

	setSingleLanguage ( $val)
	Trigger only outputting single language for multilanguage fields.

Public Member Functions inherited from ContextSource
	canUseWikiPage ()
	Check whether a WikiPage object can be get with getWikiPage().

	exportSession ()
	Export the resolved user IP, HTTP headers, user ID, and session ID.

	getConfig ()

	getContext ()
	Get the base IContextSource object.

	getLanguage ()

	getOutput ()

	getRequest ()

	getSkin ()

	getStats ()

	getTiming ()

	getTitle ()

	getUser ()
	Stable to override.

	getWikiPage ()
	Get the WikiPage object.

	msg ( $key,... $params)
	Get a Message object with context set Parameters are the same as wfMessage()

	setContext (IContextSource $context)

Static Public Member Functions
static	flattenArrayContentLang ( $vals, $type='ul', $noHtml=false, $context=false)
	Flatten an array, using the content language for any messages.

static	getFormattedData ( $tags, $context=false)
	Numbers given by Exif user agents are often magical, that is they should be replaced by a detailed explanation depending on their value which most of the time are plain integers.

static	getVisibleFields ()
	Get a list of fields that are visible by default.

Protected Member Functions
	discardMultipleValues (&$metadata)
	Takes an array returned by the getExtendedMetadata* functions, and turns all fields into single-valued ones by dropping extra values.

	getExtendedMetadataFromFile (File $file)
	Get file-based metadata in standardized format.

	getExtendedMetadataFromHook (File $file, array $extendedMetadata, &$maxCacheTime)
	Get additional metadata from hooks in standardized format.

	getPriorityLanguages ()
	Returns a list of languages (first is best) to use when formatting multilang fields, based on user and site preferences.

	resolveMultilangMetadata (&$metadata)
	Takes an array returned by the getExtendedMetadata* functions, and resolves multi-language values in it.

	resolveMultilangValue ( $value)
	Turns an XMP-style multilang array into a single value.

	resolveMultivalueValue ( $value)
	Turns an XMP-style multivalue array into a single value by dropping all but the first value.

	sanitizeArrayForAPI (&$arr)
	Makes sure the given array is a valid API response fragment.

	sanitizeKeyForAPI ( $key)
	Turns a string into a valid API identifier.

Protected Attributes
bool	$singleLang = false
	Only output a single language for multi-language fields.

Private Member Functions
	convertNewsCode ( $val)
	Fetch the human readable version of a news code.

	exifMsg ( $tag, $val, $arg=null, $arg2=null)
	Convenience function for getFormattedData()

	formatCoords ( $coord, string $type)
	Format a coordinate value, convert numbers from floating point into degree minute second representation.

	formatFraction ( $num)
	Format a rational number, reducing fractions.

	formatNum ( $num, $round=false)
	Format a number, convert numbers from fractions into floating point numbers, joins arrays of numbers with commas.

	gcd ( $a, $b)
	Calculate the greatest common divisor of two integers.

	langItem ( $value, $lang, $default=false, $noHtml=false)
	Helper function for creating lists of translations.

Detailed Description

Format Image metadata values into a human readable form.

Note lots of these messages use the prefix 'exif' even though they may not be exif properties. For example 'exif-ImageDescription' can be the Exif ImageDescription, or it could be the iptc-iim caption property, or it could be the xmp dc:description property. This is because these messages should be independent of how the data is stored, sine the user doesn't care if the description is stored in xmp, exif, etc only that its a description. (Additionally many of these properties are merged together following the MWG standard, such that for example, exif properties override XMP properties that mean the same thing if there is a conflict).

It should perhaps use a prefix like 'metadata' instead, but there is already a large number of messages using the 'exif' prefix.

Since: 1.23 the class extends ContextSource and various formerly-public internal methods are private

Definition at line 53 of file FormatMetadata.php.

Member Function Documentation

◆ collapseContactInfo()

FormatMetadata::collapseContactInfo ( $vals )

Format the contact info field into a single value.

This function might be called from JpegHandler::convertMetadataVersion which is why it is public.

Parameters

array $vals Array with fields of the ContactInfo struct defined in the IPTC4XMP spec. Or potentially an array with one element that is a free form text value from the older iptc iim 1:118 prop.

Returns: string HTML-ish looking wikitext

Since: 1.23 no longer static

Definition at line 1470 of file FormatMetadata.php.

References flattenArrayReal(), and ContextSource\msg().

Referenced by ExifBitmapHandler\convertMetadataVersion(), and makeFormattedData().

◆ convertNewsCode()

FormatMetadata::convertNewsCode ( $val )

private

Fetch the human readable version of a news code.

A news code is an 8 digit code. The first two digits are a general classification, so we just translate that.

Note, leading 0's are significant, so this is a string, not an int.

Parameters

string $val The 8 digit news code.

Returns: string The human readable form

Definition at line 1346 of file FormatMetadata.php.

References exifMsg().

Referenced by makeFormattedData().

◆ discardMultipleValues()

FormatMetadata::discardMultipleValues ( & $metadata )

protected

Takes an array returned by the getExtendedMetadata* functions, and turns all fields into single-valued ones by dropping extra values.

Parameters

array &$metadata

Since: 1.25

Definition at line 1820 of file FormatMetadata.php.

References resolveMultivalueValue().

Referenced by fetchExtendedMetadata().

◆ exifMsg()

FormatMetadata::exifMsg	(	$tag,
		$val,
		$arg = `null`,
		$arg2 = `null`
	)

private

Convenience function for getFormattedData()

Parameters

string	$tag	The tag name to pass on
string \| int	$val	The value of the tag
string \| null	$arg	An argument to pass ($1)
string \| null	$arg2	A 2nd argument to pass ($2)

Returns: string The text content of "exif-$tag-$val" message in lower case

Definition at line 1236 of file FormatMetadata.php.

References ContextSource\msg().

Referenced by convertNewsCode(), and makeFormattedData().

◆ fetchExtendedMetadata()

FormatMetadata::fetchExtendedMetadata ( File $file )

Get an array of extended metadata.

(See the imageinfo API for format.)

Parameters

File $file File to use

Returns: array [<property name> => ['value' =>

]], or [] on error

Since: 1.23

Definition at line 1609 of file FormatMetadata.php.

References $cache, $file, discardMultipleValues(), getExtendedMetadataFromFile(), getExtendedMetadataFromHook(), ContextSource\getLanguage(), resolveMultilangMetadata(), sanitizeArrayForAPI(), and wfTimestampNow().

◆ flattenArrayContentLang()

static FormatMetadata::flattenArrayContentLang	(	$vals,
		$type = `'ul'`,
		$noHtml = `false`,
		$context = `false`
	)

static

Flatten an array, using the content language for any messages.

Parameters

array	$vals	Array of values
string	$type	Type of array (either lang, ul, ol). lang = language assoc array with keys being the lang code ul = unordered list, ol = ordered list type can also come from the '_type' member of $vals.
bool	$noHtml	If to avoid returning anything resembling HTML. (Ugly hack for backwards compatibility with old MediaWiki).
bool \| IContextSource	$context

Returns: string Single value (in wiki-syntax).

Since: 1.23

Definition at line 1021 of file FormatMetadata.php.

References ContextSource\$context, $type, and ContextSource\setContext().

◆ flattenArrayReal()

FormatMetadata::flattenArrayReal	(	$vals,
		$type = `'ul'`,
		$noHtml = `false`
	)

A function to collapse multivalued tags into a single value.

This turns an array of (for example) authors into a bulleted list.

This is public on the basis it might be useful outside of this class.

Parameters

array	$vals	Array of values
string	$type	Type of array (either lang, ul, ol). lang = language assoc array with keys being the lang code ul = unordered list, ol = ordered list type can also come from the '_type' member of $vals.
bool	$noHtml	If to avoid returning anything resembling HTML. (Ugly hack for backwards compatibility with old mediawiki).

Returns: string Single value (in wiki-syntax).

Since: 1.23

Definition at line 1051 of file FormatMetadata.php.

References $content, $lang, $type, getPriorityLanguages(), langItem(), and wfDebug().

Referenced by collapseContactInfo(), and makeFormattedData().

◆ formatCoords()

FormatMetadata::formatCoords	(		$coord,
		string	$type
	)

private

Format a coordinate value, convert numbers from floating point into degree minute second representation.

Parameters

float \| string	$coord	Expected to be a number or numeric string in degrees
string	$type	"latitude" or "longitude"

Returns: string

Definition at line 1421 of file FormatMetadata.php.

References $type, formatNum(), ContextSource\msg(), and wfDebugLog().

Referenced by makeFormattedData().

◆ formatFraction()

FormatMetadata::formatFraction ( $num )

private

Format a rational number, reducing fractions.

Parameters

mixed $num The value to format

Returns: mixed A floating point number or whatever we were fed

Definition at line 1292 of file FormatMetadata.php.

References formatNum(), and gcd().

Referenced by makeFormattedData().

◆ formatNum()

FormatMetadata::formatNum	(	$num,
		$round = `false`
	)

private

Format a number, convert numbers from fractions into floating point numbers, joins arrays of numbers with commas.

Parameters

mixed	$num	The value to format
float \| int \| bool	$round	Digits to round to or false.

Returns: mixed A floating point number or whatever we were fed

Definition at line 1256 of file FormatMetadata.php.

References formatNum(), and ContextSource\getLanguage().

Referenced by formatCoords(), formatFraction(), formatNum(), and makeFormattedData().

◆ gcd()

FormatMetadata::gcd	(	$a,
		$b
	)

private

Calculate the greatest common divisor of two integers.

Parameters

int	$a	Numerator
int	$b	Denominator

Returns: int

Definition at line 1314 of file FormatMetadata.php.

Referenced by formatFraction().

◆ getExtendedMetadataFromFile()

FormatMetadata::getExtendedMetadataFromFile ( File $file )

protected

Get file-based metadata in standardized format.

Note that for a remote file, this might return metadata supplied by extensions.

Parameters

File $file File to use

Returns: array [<property name> => ['value' =>

]], or [] on error

Since: 1.23

Definition at line 1659 of file FormatMetadata.php.

References $file, $title, and wfTimestamp().

Referenced by fetchExtendedMetadata().

◆ getExtendedMetadataFromHook()

FormatMetadata::getExtendedMetadataFromHook	(	File	$file,
		array	$extendedMetadata,
		&	$maxCacheTime
	)

protected

Get additional metadata from hooks in standardized format.

Parameters

File	$file	File to use
array	$extendedMetadata
int	&$maxCacheTime	Hook handlers might use this parameter to override cache time

Returns: array [<property name> => ['value' =>

]], or [] on error

Since: 1.23

Definition at line 1708 of file FormatMetadata.php.

References $file, and ContextSource\getContext().

Referenced by fetchExtendedMetadata().

◆ getFormattedData()

static FormatMetadata::getFormattedData	(	$tags,
		$context = `false`
	)

static

Numbers given by Exif user agents are often magical, that is they should be replaced by a detailed explanation depending on their value which most of the time are plain integers.

This function formats Exif (and other metadata) values into human readable form.

This is the usual entry point for this class.

Parameters

array	$tags	The Exif data to format ( as returned by Exif::getFilteredData() or BitmapMetadataHandler )
bool \| IContextSource	$context	Context to use (optional)

Returns: array

Definition at line 86 of file FormatMetadata.php.

References ContextSource\$context, and ContextSource\setContext().

Referenced by MediaHandler\formatMetadataHelper().

◆ getPriorityLanguages()

FormatMetadata::getPriorityLanguages ( )

protected

Returns a list of languages (first is best) to use when formatting multilang fields, based on user and site preferences.

Returns: array

Since: 1.23

Definition at line 1904 of file FormatMetadata.php.

References ContextSource\getLanguage().

Referenced by flattenArrayReal(), and resolveMultilangValue().

◆ getVisibleFields()

static FormatMetadata::getVisibleFields ( )

static

Get a list of fields that are visible by default.

Returns: array

Since: 1.23

Definition at line 1588 of file FormatMetadata.php.

References $line, $lines, $matches, and wfMessage().

Referenced by MediaHandler\visibleMetadataFields().

◆ langItem()

FormatMetadata::langItem	(	$value,
		$lang,
		$default = `false`,
		$noHtml = `false`
	)

private

Helper function for creating lists of translations.

Parameters

string	$value	Value (this is not escaped)
string	$lang	Lang code of item or false
bool	$default	If it is default value.
bool	$noHtml	If to avoid html (for back-compat)

Exceptions

MWException

Returns: string Language item (Note: despite how this looks, this is treated as wikitext, not as HTML).

Definition at line 1172 of file FormatMetadata.php.

References $lang, and ContextSource\msg().

Referenced by flattenArrayReal().

◆ makeFormattedData()

FormatMetadata::makeFormattedData ( $tags )

Numbers given by Exif user agents are often magical, that is they should be replaced by a detailed explanation depending on their value which most of the time are plain integers.

This function formats Exif (and other metadata) values into human readable form.

Parameters

array $tags The Exif data to format ( as returned by Exif::getFilteredData() or BitmapMetadataHandler )

Returns: array

Since: 1.23

Definition at line 106 of file FormatMetadata.php.

References $lang, $s, $type, collapseContactInfo(), convertNewsCode(), exifMsg(), flattenArrayReal(), formatCoords(), formatFraction(), formatNum(), ContextSource\getLanguage(), ContextSource\msg(), and wfTimestamp().

◆ resolveMultilangMetadata()

FormatMetadata::resolveMultilangMetadata ( & $metadata )

protected

Takes an array returned by the getExtendedMetadata* functions, and resolves multi-language values in it.

Parameters

array &$metadata

Since: 1.23

Definition at line 1803 of file FormatMetadata.php.

References resolveMultilangValue().

Referenced by fetchExtendedMetadata().

◆ resolveMultilangValue()

FormatMetadata::resolveMultilangValue ( $value )

protected

Turns an XMP-style multilang array into a single value.

If the value is not a multilang array, it is returned unchanged. See mediawiki.org/wiki/Manual:File_metadata_handling::Multi-language_array_format

Parameters

mixed $value

Returns: mixed Value in best language, null if there were no languages at all

Since: 1.23

Definition at line 1737 of file FormatMetadata.php.

References $lang, and getPriorityLanguages().

Referenced by resolveMultilangMetadata().

◆ resolveMultivalueValue()

FormatMetadata::resolveMultivalueValue ( $value )

protected

Turns an XMP-style multivalue array into a single value by dropping all but the first value.

If the value is not a multivalue array (or a multivalue array inside a multilang array), it is returned unchanged. See mediawiki.org/wiki/Manual:File_metadata_handling::Multi-language_array_format

Parameters

mixed $value

Returns: mixed The value, or the first value if there were multiple ones

Since: 1.25

Definition at line 1778 of file FormatMetadata.php.

References resolveMultivalueValue().

Referenced by discardMultipleValues(), and resolveMultivalueValue().

◆ sanitizeArrayForAPI()

FormatMetadata::sanitizeArrayForAPI ( & $arr )

protected

Makes sure the given array is a valid API response fragment.

Parameters

array &$arr

Definition at line 1840 of file FormatMetadata.php.

References $keys, sanitizeArrayForAPI(), and sanitizeKeyForAPI().

Referenced by fetchExtendedMetadata(), and sanitizeArrayForAPI().

◆ sanitizeKeyForAPI()

FormatMetadata::sanitizeKeyForAPI ( $key )

protected

Turns a string into a valid API identifier.

Parameters

string $key

Returns: string

Since: 1.23

Definition at line 1878 of file FormatMetadata.php.

Referenced by sanitizeArrayForAPI().

◆ setSingleLanguage()

FormatMetadata::setSingleLanguage ( $val )

Trigger only outputting single language for multilanguage fields.

Parameters

bool $val

Since: 1.23

Definition at line 69 of file FormatMetadata.php.

Referenced by ApiQueryImageInfo\getInfo().

Member Data Documentation

◆ $singleLang

bool FormatMetadata::$singleLang = false

protected

Only output a single language for multi-language fields.

Since: 1.23

Definition at line 61 of file FormatMetadata.php.

The documentation for this class was generated from the following file:

includes/media/FormatMetadata.php

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Private Member Functions

Detailed Description

Member Function Documentation

◆ collapseContactInfo()

◆ convertNewsCode()

◆ discardMultipleValues()

◆ exifMsg()

◆ fetchExtendedMetadata()

◆ flattenArrayContentLang()

◆ flattenArrayReal()

◆ formatCoords()

◆ formatFraction()

◆ formatNum()

◆ gcd()

◆ getExtendedMetadataFromFile()

◆ getExtendedMetadataFromHook()

◆ getFormattedData()

◆ getPriorityLanguages()

◆ getVisibleFields()

◆ langItem()

◆ makeFormattedData()

◆ resolveMultilangMetadata()

◆ resolveMultilangValue()

◆ resolveMultivalueValue()

◆ sanitizeArrayForAPI()

◆ sanitizeKeyForAPI()

◆ setSingleLanguage()

Member Data Documentation

◆ $singleLang