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<?php |
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/** |
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* CSVelte: Slender, elegant CSV for PHP |
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* |
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* Inspired by Python's CSV module and Frictionless Data and the W3C's CSV |
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* standardization efforts, CSVelte was written in an effort to take all the |
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* suck out of working with CSV. |
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* |
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* @version v0.2.1 |
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* @copyright Copyright (c) 2016 Luke Visinoni <[email protected]> |
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* @author Luke Visinoni <[email protected]> |
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* @license https://github.com/deni-zen/csvelte/blob/master/LICENSE The MIT License (MIT) |
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*/ |
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namespace CSVelte; |
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use \InvalidArgumentException; |
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use CSVelte\Exception\ImmutableException; |
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/** |
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* CSV Flavor |
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* |
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* Represents a particular "flavor" of CSV. Inspired by python's csv "dialects". |
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* Also inspired by Frictionless Data's "dialect description" format and the W3C's |
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* CSV on the Web Working Group and their work on CSV dialects. |
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* |
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* @package CSVelte |
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* @subpackage Flavor |
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* @since v0.1 |
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* @property-read string $delimiter The delimiter character |
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* @property-read string $quoteChar The quoting character |
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* @property-read string $lineTerminator The character sequence used to terminate rows of data |
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* @property-read string $escapeChar The character used to escape quotes within a quoted string |
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* Mutually exclusive to $doubleQuote |
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* @property-read bool $doubleQuote If true, quote characters will be escaped by preceding them |
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* with another quote character. Mutually exclusive to $escapeChar |
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* @property-read string $quoteStyle One of four class constants that determine which cells are quoted |
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* @property-read bool $header If true, first row should be treated as a header row |
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*/ |
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class Flavor |
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{ |
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/** |
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* Quote all cells. |
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* Set Flavor::$quoteStyle to this to quote all cells, regardless of data type |
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* @var string |
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*/ |
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const QUOTE_ALL = 'quote_all'; |
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/** |
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* Quote no cells. |
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* Set Flavor::$quoteStyle to this to quote no columns, regardless of data type |
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* @var string |
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*/ |
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const QUOTE_NONE = 'quote_none'; |
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/** |
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* Quote minimal columns. |
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* Set Flavor::$quoteStyle to this to quote only cells that contain special |
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* characters such as newlines or the delimiter character |
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* @var string |
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*/ |
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const QUOTE_MINIMAL = 'quote_minimal'; |
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/** |
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* Quote non-numeric cells. |
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* Set Flavor::$quoteStyle to this to quote only cells that contain |
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* non-numeric data |
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* @var string |
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*/ |
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const QUOTE_NONNUMERIC = 'quote_nonnumeric'; |
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/** |
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* Delimiter character. |
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* This is the character that will be used to separate data cells within a |
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* row of CSV data. Usually a comma. |
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* @var string |
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*/ |
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protected $delimiter = ","; |
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/** |
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* Quote character. |
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* This is the character that will be used to enclose (quote) data cells. It |
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* is usually a double quote character but single quote is allowed. |
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* @var string |
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*/ |
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protected $quoteChar = '"'; |
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/** |
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* Escape character. |
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* This character will be used to escape quotes within quoted text. It is |
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* mutually exclusive to the doubleQuote attribute. Usually a backspace. |
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* @var string |
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*/ |
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protected $escapeChar = '\\'; |
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/** |
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* Double quote escape mode. |
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* If set to true, quote characters within quoted text will be escaped by |
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* preceding them with the same quote character. |
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* @var boolean |
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*/ |
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protected $doubleQuote = true; |
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/** |
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* Not yet implemented |
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* @ignore |
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*/ |
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// protected $skipInitialSpace = false; |
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/** |
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* Quoting style. |
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* This may be set to one of four values: |
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* * *Flavor::QUOTE_NONE* - To never quote data cells |
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* * *Flavor::QUOTE_ALL* - To always quote data cells |
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* * *Flavor::QUOTE_MINIMAL* - To only quote data cells that contain special characters such as quote character or delimiter character |
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* * *Flavor::QUOTE_NONNUMERIC* - To quote data cells that contain non-numeric data |
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* @var string |
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*/ |
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protected $quoteStyle = self::QUOTE_MINIMAL; |
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/** |
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* Line terminator string sequence. |
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* This is a character or sequence of characters that will be used to denote |
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* the end of a row within the data |
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* @var string |
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*/ |
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protected $lineTerminator = "\r\n"; |
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/** |
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* Header. |
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* If set to true, this means the first line of the CSV data is to be treated |
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* as the column headers. |
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* @var boolean |
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*/ |
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protected $header; |
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/** |
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* Class constructor |
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* |
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* The attributes that make up a flavor object can only be specified by |
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* passing them in an array as key => value pairs to the constructor. Once |
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* the flavor object is created, its attributes cannot be changed. |
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* |
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* @param array $attributes The attributes that define this particular flavor. These |
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* attributes are immutable. They can only be set here. |
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*/ |
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public function __construct($attributes = null) |
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{ |
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if (!is_null($attributes)) { |
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if (!is_array($attributes)) { |
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// @todo throw exception? |
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return; |
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} |
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foreach ($attributes as $attr => $val) { |
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$this->assertValidAttribute($attr); |
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$this->$attr = $val; |
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} |
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} |
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} |
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/** |
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* Does this flavor of CSV have a header row? |
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* |
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* The difference between $flavor->header and $flavor->hasHeader() is that |
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* hasHeader() is always going to give you a boolean value, whereas |
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* $flavor->header may be null. A null value for header could mean that the |
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* taster class could not reliably determine whether or not there was a |
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* header row or it could simply mean that the flavor was instantiated with |
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* no value for the header property. |
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* |
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* @return boolean |
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*/ |
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public function hasHeader() |
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{ |
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return (bool) $this->header; |
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} |
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/** |
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* Assert valid attribute name. |
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* Assert that a particular attribute is valid (basically just that it exists) |
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* and throw an exception otherwise |
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* |
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* @param string $attr The attribute to check validity of |
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* @throws InvalidArgumentException |
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* @internal |
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* @todo This should accept a second parameter for value that asserts the value |
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* is a valid value |
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*/ |
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protected function assertValidAttribute($attr) |
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{ |
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if (!property_exists(self::class, $attr)) |
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throw new InvalidArgumentException("Unknown attribute: " . $attr); |
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} |
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/** |
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* Copy this flavor object |
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* |
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* Because flavor attributes are immutable, it is implossible to change their |
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* attributes. If you need to change a flavor's attributes, call this method |
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* instead, specifying which attributes are to be changed. |
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* |
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* @param array $attribs An array of attribute name/values to change in the copied flavor |
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* @return Flavor A flavor object with your new attributes |
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* @todo I may want to remove the array type-hint so that this can accept |
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* array-like objects and iterables as well. Not sure... |
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*/ |
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public function copy(array $attribs = array()) |
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{ |
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return new Flavor(array_merge($this->toArray(), $attribs)); |
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} |
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/** |
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* Attribute accessor magic method |
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* |
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* @param string $attr The attribute to "get" |
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* @return string The attribute value |
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* @internal |
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* @throws InvalidArgumentException |
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*/ |
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public function __get($attr) |
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{ |
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$this->assertValidAttribute($attr); |
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return $this->$attr; |
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} |
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/** |
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* Attribute accessor (setter) magic method. |
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* Disabled because attributes are immutable (read-only) |
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* |
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* @param string $attr The attribute name you're attempting to set |
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* @param mixed $val The attribute value |
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* @throws ImmutableException |
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* @internal param The $string attribute to "set" |
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* @internal param The $string attribute value |
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* @internal |
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*/ |
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public function __set($attr, $val) |
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{ |
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throw new ImmutableException("Cannot change attributes on an immutable object: " . self::class . "::\$" . $attr); |
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} |
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/** |
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* Get this object as an array |
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* |
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* @return array This object as an array |
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*/ |
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public function toArray() |
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{ |
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return get_object_vars($this); |
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} |
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} |
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