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<?php declare(strict_types=1); |
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namespace FileEye\MimeMap; |
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/** |
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* Class for parsing RFC 2045 Content-Type Header Fields. |
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*/ |
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class TypeParser |
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{ |
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/** |
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* Parse a mime-type and set the class variables. |
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* |
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* @param string $type_string |
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* MIME type string to parse. |
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* @param Type $type |
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* The Type object to receive the components. |
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* |
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* @throws MalformedTypeException when $type_string is malformed. |
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*/ |
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public static function parse(string $type_string, Type $type): void |
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{ |
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// Media and SubType are separated by a slash '/'. |
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$media = static::parseStringPart($type_string, 0, '/'); |
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if (!$media['string']) { |
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throw new MalformedTypeException('Media type not found'); |
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} |
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if (!$media['delimiter_matched']) { |
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throw new MalformedTypeException('Slash \'/\' to separate media type and subtype not found'); |
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} |
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$type->setMedia(strtolower((string) $media['string'])); |
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if ($media['comment'] !== null) { |
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$type->setMediaComment($media['comment']); |
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} |
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// SubType and Parameters are separated by semicolons ';'. |
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$sub = static::parseStringPart($type_string, $media['end_offset'] + 1, ';'); |
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if (!$sub['string']) { |
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throw new MalformedTypeException('Media subtype not found'); |
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} |
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$type->setSubType(strtolower((string) $sub['string'])); |
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if ($sub['comment'] !== null) { |
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$type->setSubTypeComment($sub['comment']); |
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} |
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// Loops through the parameter. |
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while ($sub['delimiter_matched']) { |
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$sub = static::parseStringPart($type_string, $sub['end_offset'] + 1, ';'); |
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$tmp = explode('=', $sub['string'], 2); |
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$p_name = trim($tmp[0]); |
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$p_val = trim($tmp[1]); |
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$p_val = str_replace('\\"', '"', $p_val); |
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$type->addParameter($p_name, $p_val, $sub['comment']); |
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} |
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} |
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/** |
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* Parses a part of the content MIME type string. |
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* |
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* Splits string and comment until a delimiter is found. |
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* |
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* @param string $string |
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* Input string. |
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* @param int $offset |
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* Offset to start parsing from. |
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* @param string $delimiter |
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* Stop parsing when delimiter found. |
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* |
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* @return array{'string': string, 'comment': string|null, 'delimiter_matched': bool, 'end_offset': int} |
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* An array with the following keys: |
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* 'string' - the uncommented part of $string |
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* 'comment' - the comment part of $string |
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* 'delimiter_matched' - true if a $delimiter stopped the parsing, false |
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* otherwise |
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* 'end_offset' - the last position parsed in $string. |
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*/ |
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public static function parseStringPart(string $string, int $offset, string $delimiter): array |
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{ |
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$inquote = false; |
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$escaped = false; |
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$incomment = 0; |
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$newstring = ''; |
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$comment = ''; |
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for ($n = $offset; $n < strlen($string); $n++) { |
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if ($string[$n] === $delimiter && !$escaped && !$inquote && $incomment === 0) { |
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break; |
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} |
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if ($escaped) { |
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if ($incomment == 0) { |
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$newstring .= $string[$n]; |
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} else { |
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$comment .= $string[$n]; |
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} |
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$escaped = false; |
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continue; |
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} |
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if ($string[$n] == '\\') { |
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if ($incomment > 0) { |
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$comment .= $string[$n]; |
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} |
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$escaped = true; |
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continue; |
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} |
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if (!$inquote && $incomment > 0 && $string[$n] == ')') { |
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$incomment--; |
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if ($incomment == 0) { |
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$comment .= ' '; |
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} |
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continue; |
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} |
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if (!$inquote && $string[$n] == '(') { |
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$incomment++; |
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continue; |
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} |
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if ($string[$n] == '"') { |
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if ($incomment > 0) { |
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$comment .= $string[$n]; |
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} else { |
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if ($inquote) { |
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$inquote = false; |
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} else { |
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$inquote = true; |
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} |
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} |
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continue; |
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} |
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97 |
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if ($incomment == 0) { |
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$newstring .= $string[$n]; |
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continue; |
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} |
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$comment .= $string[$n]; |
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} |
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if ($incomment > 0) { |
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throw new MalformedTypeException('Comment closing bracket missing: ' . $comment); |
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} |
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return [ |
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'string' => trim($newstring), |
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'comment' => empty($comment) ? null : trim($comment), |
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'delimiter_matched' => isset($string[$n]) ? ($string[$n] === $delimiter) : false, |
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'end_offset' => $n, |
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]; |
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} |
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} |
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FileEye /
MimeMap
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