a075271157
https://github.com/composer/spdx-licenses/compare/1.3.0...1.4.0 Change-Id: I39f7a1310455159866bfed5224536e800befec0d
78 lines
2.3 KiB
PHP
78 lines
2.3 KiB
PHP
<?php
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/**
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* Utility for parsing a HTTP Accept header value into a weight map. May also be used with
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* other, similar headers like Accept-Language, Accept-Encoding, etc.
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*
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* @license GPL-2.0-or-later
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* @author Daniel Kinzler
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*/
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namespace Wikimedia\Http;
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class HttpAcceptParser {
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/**
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* Parses an HTTP header into a weight map, that is an associative array
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* mapping values to their respective weights. Any header name preceding
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* weight spec is ignored for convenience.
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*
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* This implementation is partially based on the code at
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* http://www.thefutureoftheweb.com/blog/use-accept-language-header
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*
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* Note that type parameters and accept extension like the "level" parameter
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* are not supported, weights are derived from "q" values only.
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*
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* @todo If additional type parameters are present, ignore them cleanly.
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* At present, they often confuse the result.
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*
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* See HTTP/1.1 section 14 for details.
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*
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* @param string $rawHeader
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*
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* @return array
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*/
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public function parseWeights( $rawHeader ) {
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//FIXME: The code below was copied and adapted from WebRequest::getAcceptLang.
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// Move this utility class into core for reuse!
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// first, strip header name
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$rawHeader = preg_replace( '/^[-\w]+:\s*/', '', $rawHeader );
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// Return values in lower case
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$rawHeader = strtolower( $rawHeader );
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// Break up string into pieces (values and q factors)
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$value_parse = null;
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preg_match_all( '@([a-z\d*]+([-+/.][a-z\d*]+)*)\s*(;\s*q\s*=\s*(1(\.0{0,3})?|0(\.\d{0,3})?)?)?@',
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$rawHeader, $value_parse );
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if ( !count( $value_parse[1] ) ) {
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return [];
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}
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$values = $value_parse[1];
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$qvalues = $value_parse[4];
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$indices = range( 0, count( $value_parse[1] ) - 1 );
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// Set default q factor to 1
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foreach ( $indices as $index ) {
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if ( $qvalues[$index] === '' ) {
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$qvalues[$index] = 1;
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} elseif ( $qvalues[$index] == 0 ) {
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unset( $values[$index], $qvalues[$index], $indices[$index] );
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} else {
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$qvalues[$index] = (float)$qvalues[$index];
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}
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}
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// Sort list. First by $qvalues, then by order. Reorder $values the same way
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array_multisort( $qvalues, SORT_DESC, SORT_NUMERIC, $indices, $values );
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// Create a list like "en" => 0.8
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$weights = array_combine( $values, $qvalues );
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return $weights;
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}
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}
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