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<?php |
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namespace Badcow\DNS\Parser; |
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class Normaliser |
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{ |
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/** |
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* @var StringIterator |
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*/ |
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private $string; |
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/** |
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* @var string |
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*/ |
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private $normalisedString = ''; |
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/** |
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* Normaliser constructor. |
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* |
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* @param string $zone |
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*/ |
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public function __construct(string $zone) |
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{ |
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//Remove Windows line feeds and tabs |
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$zone = str_replace([Tokens::CARRIAGE_RETURN, Tokens::TAB], ['', Tokens::SPACE], $zone); |
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$this->string = new StringIterator($zone); |
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} |
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/** |
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* @param string $zone |
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* |
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* @return string |
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* |
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* @throws ParseException |
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*/ |
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public static function normalise(string $zone): string |
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{ |
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$normaliser = new self($zone); |
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return $normaliser->process(); |
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} |
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/** |
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* @return string |
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* |
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* @throws ParseException |
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*/ |
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public function process(): string |
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{ |
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while ($this->string->valid()) { |
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$this->handleTxt(); |
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$this->handleComment(); |
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$this->handleMultiline(); |
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$this->append(); |
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} |
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$this->removeWhitespace(); |
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return $this->normalisedString; |
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} |
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/** |
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* Ignores the comment section. |
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*/ |
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private function handleComment(): void |
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{ |
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if ($this->string->isNot(Tokens::SEMICOLON)) { |
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return; |
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} |
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while ($this->string->isNot(Tokens::LINE_FEED) && $this->string->valid()) { |
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$this->string->next(); |
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} |
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} |
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/** |
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* Handle text inside of double quotations. When this function is called, the String pointer MUST be at the |
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* double quotation mark. |
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* |
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* @throws ParseException |
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*/ |
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private function handleTxt(): void |
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{ |
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if ($this->string->isNot(Tokens::DOUBLE_QUOTES)) { |
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return; |
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} |
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$this->append(); |
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while ($this->string->isNot(Tokens::DOUBLE_QUOTES)) { |
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if (!$this->string->valid()) { |
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throw new ParseException('Unbalanced double quotation marks. End of file reached.'); |
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} |
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//If escape character |
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if ($this->string->is(Tokens::BACKSLASH)) { |
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$this->append(); |
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} |
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if ($this->string->is(Tokens::LINE_FEED)) { |
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throw new ParseException('Line Feed found within double quotation marks context.', $this->string); |
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} |
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$this->append(); |
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} |
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} |
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/** |
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* Move multi-line records onto single line. |
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* |
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* @throws ParseException |
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*/ |
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private function handleMultiline(): void |
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{ |
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if ($this->string->isNot(Tokens::OPEN_BRACKET)) { |
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return; |
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} |
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$this->string->next(); |
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while ($this->string->valid()) { |
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$this->handleTxt(); |
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$this->handleComment(); |
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if ($this->string->is(Tokens::LINE_FEED)) { |
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$this->string->next(); |
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continue; |
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} |
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if ($this->string->is(Tokens::CLOSE_BRACKET)) { |
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$this->string->next(); |
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return; |
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} |
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$this->append(); |
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} |
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throw new ParseException('End of file reached. Unclosed bracket.'); |
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} |
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/** |
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* Remove superfluous whitespace characters from string. |
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*/ |
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9 |
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private function removeWhitespace(): void |
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{ |
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$string = preg_replace('/ {2,}/', Tokens::SPACE, $this->normalisedString); |
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$lines = []; |
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foreach (explode(Tokens::LINE_FEED, $string) as $line) { |
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if ('' !== $line = trim($line)) { |
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$lines[] = $line; |
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} |
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} |
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$this->normalisedString = implode(Tokens::LINE_FEED, $lines); |
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} |
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/** |
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* Add current entry to normalisedString and moves iterator to next entry. |
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*/ |
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private function append() |
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{ |
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$this->normalisedString .= $this->string->current(); |
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$this->string->next(); |
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} |
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} |
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Badcow /
DNS-Parser
