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<?php |
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namespace Geezify\Converter; |
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use Geezify\Exception\NotAnIntegerArgumentException; |
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/** |
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* GeezConverter converts ascii number like <b>1986</b> |
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* to equivalent geez number like <b>፲፱፻፹፮</b>. |
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* |
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* @author Sam As End <4sam21{at}gmail.com> |
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*/ |
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class GeezConverter extends Converter |
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{ |
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/** |
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* Convert an ascii number like <b>1, 21, 3456</b> to |
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* geez number <b>፩, ፳፩, ፴፬፻፶፮</b>. |
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* |
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* @param int $ascii_number |
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* |
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* @throws NotAnIntegerArgumentException if the number is not an integer |
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* |
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* @return string |
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*/ |
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public function convert($ascii_number) |
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{ |
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list($number, $length) = $this->prepareForConversion($ascii_number); |
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$result = static::EMPTY_CHARACTER; |
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for ($index = 0; $index < $length; $index += 2) { |
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$result .= $this->parseEachTwoCharactersBlock($number, $index, $length); |
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} |
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return $result; |
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} |
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/** |
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* - Validate the number |
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* - Convert the number to a string |
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* - Get the length of the number |
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* - Prepend a space if the length is odd. |
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* |
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* @param $ascii_number |
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* |
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* @throws \Geezify\Exception\NotAnIntegerArgumentException |
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* |
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* @return array the $number and the $length |
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*/ |
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protected function prepareForConversion($ascii_number) |
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{ |
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$validated_number = $this->validateAsciiNumber($ascii_number); |
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$validated_number = "{$validated_number}"; |
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$length = \strlen($validated_number); |
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$number = $this->prependSpaceIfLengthIsEven($validated_number, $length); |
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// return the number too ... i don't wanna "strlen" again |
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return [ |
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$number, |
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$length, |
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]; |
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} |
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/** |
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* Validate if the number is ascii number. |
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* |
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* @param $ascii_number |
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* |
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* @throws NotAnIntegerArgumentException |
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* |
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* @return int |
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*/ |
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protected function validateAsciiNumber($ascii_number) |
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{ |
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if (!is_int($ascii_number)) { |
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throw new NotAnIntegerArgumentException($ascii_number); |
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} |
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return $ascii_number; |
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} |
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/** |
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* Prepend space if the length of the number is odd. |
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* |
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* @param $ascii_number |
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* @param $length |
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* |
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* @return string |
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*/ |
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protected function prependSpaceIfLengthIsEven($ascii_number, $length) |
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{ |
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if ($this->isOdd($length)) { |
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return " {$ascii_number}"; |
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} |
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return $ascii_number; |
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} |
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/** |
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* Is a number odd? |
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* |
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* @param $ascii_number |
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* |
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* @return bool |
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*/ |
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protected function isOdd($ascii_number) |
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{ |
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return !$this->isEven($ascii_number); |
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} |
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/** |
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* Is a number even? |
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* |
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* @param $number |
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* |
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* @return bool |
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*/ |
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protected function isEven($number) |
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{ |
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return ($number % 2) === 0; |
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} |
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/** |
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* Parse each two character block. |
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* |
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* @param $number |
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* @param $index |
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* @param $length |
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* |
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* @return string |
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*/ |
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protected function parseEachTwoCharactersBlock($number, $index, $length) |
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{ |
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$geez_number = $this->getGeezNumberOfTheBlock($number, $index); |
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$bet = $this->getBet($length, $index); |
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$geez_separator = $this->getGeezSeparator($bet); |
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return $this->combineBlockAndSeparator($geez_number, $geez_separator, $index); |
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} |
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/** |
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* Fetch the two character (00-99) block and convert it to geez. |
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* |
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* @param $number |
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* @param $index |
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* |
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* @return string geez two character block |
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*/ |
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protected function getGeezNumberOfTheBlock($number, $index) |
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{ |
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$block = $this->getBlock($number, $index); |
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$tenth = (int) $block[0]; |
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$once = (int) $block[1]; |
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return |
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static::GEEZ_NUMBERS[($tenth * 10)].static::GEEZ_NUMBERS[$once]; |
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} |
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/** |
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* Fetch two characters from the $number starting from $index. |
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* |
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* @param $number string the whole ascii number |
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* @param $index integer the starting position |
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* |
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* @return string |
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*/ |
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protected function getBlock($number, $index) |
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{ |
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return \substr($number, $index, 2); |
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} |
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/** |
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* The ቤት of the block. |
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* |
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* @param $length integer the length of the ascii number |
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* @param $index integer the character index |
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* |
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* @return int |
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*/ |
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protected function getBet($length, $index) |
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{ |
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$reverse_index = (($length - 1) - $index); |
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// i didn't use floor instead of 'floor' b/c it returns a |
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// float and 'intval' gives the same thing in integer |
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return intval($reverse_index / 2); |
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} |
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/** |
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* Get the separator depending on the bet. |
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* |
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* @param $bet |
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* |
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* @return string return ፻,፼ or empty character |
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*/ |
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protected function getGeezSeparator($bet) |
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{ |
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if ($this->isZero($bet)) { |
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return static::EMPTY_CHARACTER; |
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} elseif ($this->isOdd($bet)) { |
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return static::GEEZ_NUMBERS[100]; |
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} else { |
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return static::GEEZ_NUMBERS[10000]; |
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} |
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} |
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/** |
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* Combines the block and the separator. |
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* |
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* @param string $geez_number |
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* @param string $separator |
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* @param int $index of the block |
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* |
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* @return string |
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*/ |
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protected function combineBlockAndSeparator( |
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$geez_number, |
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$separator, |
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$index |
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) { |
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if ($this->shouldRemoveGeezSeparator($geez_number, $separator)) { |
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$separator = static::EMPTY_CHARACTER; |
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} |
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if ($this->shouldRemoveGeezNumberBlock($geez_number, $separator, $index)) { |
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$geez_number = static::EMPTY_CHARACTER; |
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} |
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return $geez_number.$separator; |
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} |
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/** |
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* Returns true if the block is empty and the separator is 100. |
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* |
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* @param string $block |
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* @param string $separator |
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* |
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* @return bool |
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*/ |
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protected function shouldRemoveGeezSeparator($block, $separator) |
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{ |
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return |
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empty($block) && |
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$this->isGeezNumberHundred($separator); |
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} |
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/** |
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* Returns true if the ascii number is 100 or |
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* if the ascii number is the leading 10000. |
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* |
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* @param $block |
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* @param $separator |
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* @param $index |
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* |
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* @return bool |
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*/ |
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protected function shouldRemoveGeezNumberBlock($block, $separator, $index) |
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{ |
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return |
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$this->isOneHundred($block, $separator) || |
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$this->isLeadingTenThousand($block, $separator, $index); |
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} |
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/** |
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* Returns true if the number is 100. |
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* |
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* @param $block |
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* @param $separator |
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* |
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* @return bool |
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*/ |
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protected function isOneHundred($block, $separator) |
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{ |
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return |
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$this->isGeezNumberHundred($separator) && |
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$this->isGeezNumberOne($block); |
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} |
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/** |
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* Returns true if the number is the leading 10000. |
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* |
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* @param $block |
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* @param $separator |
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* @param $index |
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* |
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* @return bool |
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*/ |
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protected function isLeadingTenThousand($block, $separator, $index) |
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{ |
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return |
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$this->isZero($index) && |
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$this->isGeezNumberOne($block) && |
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$this->isGeezNumberTenThousand($separator); |
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} |
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} |
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