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112 lines
3.2 KiB
112 lines
3.2 KiB
<?php
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/**
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* @package Polylang
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*/
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/**
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* Class Accept_Language.
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*
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* Represents an Accept-Language HTTP Header, as defined in RFC 2616 Section 14.4 {@see https://tools.ietf.org/html/rfc2616.html#section-14.4}.
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*
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* @since 3.0
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*/
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class PLL_Accept_Language {
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const SUBTAG_PATTERNS = array(
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'language' => '(\b[a-z]{2,3}|[a-z]{4}|[a-z]{5-8}\b)',
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'language-extension' => '(?:-(\b[a-z]{3}){1,3}\b)?',
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'script' => '(?:-(\b[a-z]{4})\b)?',
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'region' => '(?:-(\b[a-z]{2}|[0-9]{3})\b)?',
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'variant' => '(?:-(\b[0-9][a-z]{1,3}|[a-z][a-z0-9]{4,7})\b)?',
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'extension' => '(?:-(\b[a-wy-z]-[a-z0-9]{2,8})\b)?',
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'private-use' => '(?:-(\bx-[a-z0-9]{1,8})\b)?',
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);
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/**
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* @var string[] {
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* @type string $language Usually 2 or three letters (ISO 639).
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* @type string $language-extension Up to three groups of 3 letters.
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* @type string $script Four letters.
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* @type string $region Either two letters of three digits.
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* @type string $variant Either one digit followed by 1 to 3 letters, or a letter followed by 2 to 7 alphanumerical characters.
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* @type string $extension One letter that cannot be an 'x', followed by 2 to 8 alphanumerical characters.
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* @type string $private-use Starts by 'x-', followed by 1 to 8 alphanumerical characters.
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* }
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*/
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protected $subtags;
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/**
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* @var float
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*/
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protected $quality;
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/**
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* PLL_Accept_Language constructor.
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*
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* @since 3.0
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*
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* @param string[] $subtags With subtag name as keys and subtag values as names.
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* @param mixed $quality Floating point value from 0.0 to 1.0. Higher values indicates a user's preference.
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*/
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public function __construct( $subtags, $quality = 1.0 ) {
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$this->subtags = $subtags;
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$this->quality = is_numeric( $quality ) ? floatval( $quality ) : 1.0;
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}
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/**
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* Creates a new instance from an array resulting of a PHP {@see preg_match()} or {@see preg_match_all()} call.
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*
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* @since 3.0
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*
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* @param string[] $matches Expects first entry to be full match, following entries to be subtags and last entry to be quality factor.
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* @return PLL_Accept_Language
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*/
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public static function from_array( $matches ) {
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$subtags = array_combine(
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array_keys( array_slice( self::SUBTAG_PATTERNS, 0, count( $matches ) - 1 ) ),
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array_slice( $matches, 1, count( self::SUBTAG_PATTERNS ) )
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);
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$quality = count( $matches ) === 9 ? $matches[8] : 1.0;
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return new PLL_Accept_Language( $subtags, $quality );
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}
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/**
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* Returns the full language tag.
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*
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* @since 3.0
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*
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* @return string
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*/
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public function __toString() {
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$subtags = array_filter(
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$this->subtags,
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function ( $subtag ) {
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return ! empty( trim( $subtag ) );
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}
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);
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return implode( '-', $subtags );
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}
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/**
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* Returns the quality factor as negotiated by the browser agent.
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*
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* @since 3.0
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*
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* @return float
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*/
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public function get_quality() {
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return $this->quality;
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}
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/**
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* Returns a subtag from the language tag.
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*
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* @since 3.0
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*
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* @param string $name A valid subtag name, {@see PLL_Accept_Language::SUBTAG_PATTERNS} for available subtag names.
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* @return string
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*/
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public function get_subtag( $name ) {
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return isset( $this->subtags[ $name ] ) ? $this->subtags[ $name ] : '';
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}
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}
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