HTMLPurifier_Length Class Reference

Represents a measurable length, with a string numeric magnitude and a unit. More...

Collaboration diagram for HTMLPurifier_Length:

Public Member Functions
	__construct ($n= '0', $u=false)
	toString ()
	Returns string representation of number.
	getN ()
	Retrieves string numeric magnitude.
	getUnit ()
	Retrieves string unit.
	isValid ()
	Returns true if this length unit is valid.
	compareTo ($l)
	Compares two lengths, and returns 1 if greater, -1 if less and 0 if equal.

Static Public Member Functions
static	make ($s)

Protected Member Functions
	validate ()
	Validates the number and unit.

Protected Attributes
	$n
	String numeric magnitude.
	$unit
	String unit.
	$isValid
	Whether or not this length is valid.

Static Protected Attributes
static	$allowedUnits
	Lookup array of units recognized by CSS 2.1.

Detailed Description

Represents a measurable length, with a string numeric magnitude and a unit.

This object is immutable.

Definition at line 7 of file Length.php.

Constructor & Destructor Documentation

HTMLPurifier_Length::__construct	(		$n = '0',
			$u = false
	)

Parameters

number	$n	Magnitude
string	$u	Unit

Definition at line 37 of file Length.php.

References $n, and n.

                                                      {
        $this->n = (string) $n;
        $this->unit = $u !== false ? (string) $u : false;
    }

Member Function Documentation

HTMLPurifier_Length::compareTo

(

$l

)

Compares two lengths, and returns 1 if greater, -1 if less and 0 if equal.

Warning

If both values are too large or small, this calculation will not work properly

Definition at line 103 of file Length.php.

References $l, and n.

                                  {
        if ($l === false) return false;
        if ($l->unit !== $this->unit) {
            $converter = new HTMLPurifier_UnitConverter();
            $l = $converter->convert($l, $this->unit);
            if ($l === false) return false;
        }
        return $this->n - $l->n;
    }

HTMLPurifier_Length::getN

(

)

Retrieves string numeric magnitude.

Definition at line 83 of file Length.php.

References $n.

{return $this->n;}

HTMLPurifier_Length::getUnit

(

)

Retrieves string unit.

Definition at line 88 of file Length.php.

References $unit.

{return $this->unit;}

HTMLPurifier_Length::isValid

(

)

Returns true if this length unit is valid.

Definition at line 93 of file Length.php.

References $isValid, and validate().

Referenced by toString().

                              {
        if ($this->isValid === null) $this->isValid = $this->validate();
        return $this->isValid;
    }

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static HTMLPurifier_Length::make (   $s )

static

Parameters

string

$s

Unit string, like '2em' or '3.4in'

Warning

Does not perform validation.

Definition at line 46 of file Length.php.

References $n, and $unit.

                                    {
        if ($s instanceof HTMLPurifier_Length) return $s;
        $n_length = strspn($s, '1234567890.+-');
        $n = substr($s, 0, $n_length);
        $unit = substr($s, $n_length);
        if ($unit === '') $unit = false;
        return new HTMLPurifier_Length($n, $unit);
    }

HTMLPurifier_Length::toString

(

)

Returns string representation of number.

Definition at line 75 of file Length.php.

References $unit, isValid(), and n.

                               {
        if (!$this->isValid()) return false;
        return $this->n . $this->unit;
    }

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HTMLPurifier_Length::validate ( )

protected

Validates the number and unit.

Definition at line 58 of file Length.php.

References $allowedUnits, and n.

Referenced by isValid().

                                  {
        // Special case:
        if ($this->n === '+0' || $this->n === '-0') $this->n = '0';
        if ($this->n === '0' && $this->unit === false) return true;
        if (!ctype_lower($this->unit)) $this->unit = strtolower($this->unit);
        if (!isset(HTMLPurifier_Length::$allowedUnits[$this->unit])) return false;
        // Hack:
        $def = new HTMLPurifier_AttrDef_CSS_Number();
        $result = $def->validate($this->n, false, false);
        if ($result === false) return false;
        $this->n = $result;
        return true;
    }

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Field Documentation

HTMLPurifier_Length::$allowedUnits

staticprotected

Initial value:

 array(
        'em' => true, 'ex' => true, 'px' => true, 'in' => true,
        'cm' => true, 'mm' => true, 'pt' => true, 'pc' => true
    )

Lookup array of units recognized by CSS 2.1.

Definition at line 28 of file Length.php.

Referenced by validate().

HTMLPurifier_Length::$isValid

protected

Whether or not this length is valid.

Null if not calculated yet.

Definition at line 23 of file Length.php.

Referenced by isValid().

HTMLPurifier_Length::$n

protected

String numeric magnitude.

Definition at line 13 of file Length.php.

Referenced by __construct(), getN(), and make().

HTMLPurifier_Length::$unit

protected

String unit.

False is permitted if $n = 0.

Definition at line 18 of file Length.php.

Referenced by getUnit(), make(), and toString().

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The documentation for this class was generated from the following file:

• Services/Html/HtmlPurifier/library/HTMLPurifier/Length.php