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<?php
declare( strict_types = 1 );
namespace MediaWiki\Extension\Translate\MessageProcessing;
use InvalidArgumentException;
use MediaWiki\Extension\Translate\Utilities\Utilities;
/**
* Flattens message arrays for further processing. Supports parsing CLDR
* plural messages and converting them into MediaWiki's {{PLURAL}} syntax
* in a single message.
*
* @author Niklas Laxström
* @author Erik Moeller
* @license GPL-2.0-or-later
* @since 2016.01
*/
class ArrayFlattener {
/** Names for plural groups used by CLDR */
private const PLURAL_WORDS = [
'zero' => 1,
'one' => 1,
'many' => 1,
'few' => 1,
'other' => 1,
'two' => 1
];
private string $sep;
private bool $parseCLDRPlurals;
public function __construct( string $sep = '.', bool $parseCLDRPlurals = false ) {
$this->sep = $sep;
$this->parseCLDRPlurals = $parseCLDRPlurals;
}
/**
* Flattens multidimensional array by using the path to the value as key
* with each individual key separated by a dot.
* @param array $unflat Array of messages
*/
public function flatten( array $unflat ): array {
$flat = [];
foreach ( $unflat as $key => $value ) {
if ( !is_array( $value ) ) {
$flat[$key] = $value;
continue;
}
$plurals = false;
if ( $this->parseCLDRPlurals ) {
$plurals = $this->flattenCLDRPlurals( $value );
}
if ( $this->parseCLDRPlurals && $plurals ) {
$flat[$key] = $plurals;
} else {
$temp = [];
foreach ( $value as $subKey => $subValue ) {
$newKey = "$key{$this->sep}$subKey";
$temp[$newKey] = $subValue;
}
$flat += $this->flatten( $temp );
}
// Can as well keep only one copy around.
unset( $unflat[$key] );
}
return $flat;
}
/**
* Flattens arrays that contain CLDR plural keywords into single values using
* MediaWiki's plural syntax.
* @return bool|string
*/
public function flattenCLDRPlurals( array $messages ) {
$hasNonPluralKeys = false;
$pluralKeys = [];
foreach ( $messages as $key => $value ) {
if ( is_array( $value ) ) {
// Plurals can only happen in the lowest level of the structure
return false;
}
// Check if we find any reserved plural keyword
if ( isset( self::PLURAL_WORDS[$key] ) ) {
$pluralKeys[] = $key;
} else {
$hasNonPluralKeys = true;
}
}
// No plural keys at all, we can skip
if ( !$pluralKeys ) {
return false;
}
// Mixed plural keys with other keys, should not happen
if ( $hasNonPluralKeys ) {
// Allow `other` with other keys, as long it is only one of the reserved ones
if ( $pluralKeys === [ 'other' ] ) {
return false;
}
$keys = implode( ', ', array_keys( $messages ) );
throw new InvalidArgumentException( "Reserved plural keywords mixed with other keys: $keys." );
}
$pls = '{{PLURAL';
foreach ( $messages as $key => $value ) {
if ( $key === 'other' ) {
continue;
}
$pls .= "|$key=$value";
}
// Put the "other" alternative last, without other= prefix.
$other = isset( $messages['other'] ) ? '|' . $messages['other'] : '';
$pls .= "$other}}";
return $pls;
}
/**
* Performs the reverse operation of flatten. Each dot (or custom separator)
* in the key starts a new subarray in the final array.
* @param array $flat Array of messages
*/
public function unflatten( array $flat ): array {
$unflat = [];
if ( $this->parseCLDRPlurals ) {
$unflattenedPlurals = [];
foreach ( $flat as $key => $value ) {
$plurals = false;
if ( !is_array( $value ) ) {
$plurals = $this->unflattenCLDRPlurals( $key, $value );
}
if ( is_array( $plurals ) ) {
$unflattenedPlurals += $plurals;
} else {
$unflattenedPlurals[$key] = $value;
}
}
$flat = $unflattenedPlurals;
}
foreach ( $flat as $key => $value ) {
$path = explode( $this->sep, $key );
if ( count( $path ) === 1 ) {
$unflat[$key] = $value;
continue;
}
$pointer = &$unflat;
do {
// Extract the level and make sure it exists.
$level = array_shift( $path );
if ( !isset( $pointer[$level] ) ) {
$pointer[$level] = [];
}
// Update the pointer to the new reference.
$tmpPointer = &$pointer[$level];
unset( $pointer );
$pointer = &$tmpPointer;
unset( $tmpPointer );
// If next level is the last, add it into the array.
if ( count( $path ) === 1 ) {
$lastKey = array_shift( $path );
$pointer[$lastKey] = $value;
}
} while ( count( $path ) );
}
return $unflat;
}
/**
* Converts the plural syntax to array of CLDR style plurals
* @return bool|array
*/
public function unflattenCLDRPlurals( string $key, string $message ) {
// Quick escape.
if ( !str_contains( $message, '{{PLURAL' ) ) {
return false;
}
/*
* Replace all variables with placeholders. Possible source of bugs
* if other characters that given below are used.
*/
$regex = '/\{[a-z_-]+}/i';
$placeholders = [];
$match = [];
while ( preg_match( $regex, $message, $match ) ) {
$uniqkey = Utilities::getPlaceholder();
$placeholders[$uniqkey] = $match[0];
$search = preg_quote( $match[0], '~' );
$message = preg_replace( "~$search~", $uniqkey, $message );
}
// Then replace (possible multiple) plural instances into placeholders.
$regex = '~\{\{PLURAL\|(.*?)}}~s';
$matches = [];
$match = [];
while ( preg_match( $regex, $message, $match ) ) {
$uniqkey = Utilities::getPlaceholder();
$matches[$uniqkey] = $match;
$message = preg_replace( $regex, $uniqkey, $message, 1 );
}
// No plurals, should not happen.
if ( !count( $matches ) ) {
return false;
}
// The final array of alternative plurals forms.
$alts = [];
/*
* Then loop trough each plural block and replacing the placeholders
* to construct the alternatives. Produces invalid output if there is
* multiple plural bocks which don't have the same set of keys.
*/
$pluralChoice = implode( '|', array_keys( self::PLURAL_WORDS ) );
$regex = "~($pluralChoice)\s*=\s*(.*)~s";
foreach ( $matches as $ph => $plu ) {
$forms = explode( '|', $plu[1] );
foreach ( $forms as $form ) {
$match = [];
if ( preg_match( $regex, $form, $match ) ) {
$formWord = "$key{$this->sep}{$match[1]}";
$value = $match[2];
} else {
$formWord = "$key{$this->sep}other";
$value = $form;
}
if ( !isset( $alts[$formWord] ) ) {
$alts[$formWord] = $message;
}
$string = $alts[$formWord];
$alts[$formWord] = str_replace( $ph, $value, $string );
}
}
// Replace other variables.
foreach ( $alts as &$value ) {
$value = str_replace( array_keys( $placeholders ), array_values( $placeholders ), $value );
}
if ( !isset( $alts["$key{$this->sep}other"] ) ) {
// Ensure other form is always present, even if missing from the translation
$alts["$key{$this->sep}other"] = end( $alts );
}
return $alts;
}
/** Compares two strings for equal content, taking PLURAL expansion into account. */
public function compareContent( ?string $a, ?string $b ): bool {
if ( !$this->parseCLDRPlurals || $a === null || $b === null ) {
return $a === $b;
}
$a2 = $this->unflattenCLDRPlurals( 'prefix', $a );
$b2 = $this->unflattenCLDRPlurals( 'prefix', $b );
// Fall back to regular comparison if parsing fails.
if ( $a2 === false || $b2 === false ) {
return $a === $b;
}
// Require key-value pairs to match, but ignore order and types (all should be strings).
return $a2 == $b2;
}
}