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

Static Public Member Functions
static	make ($s)

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

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

Static Protected Attributes
static	$allowedUnits
	Array Lookup array of units recognized by CSS 2.1 @type array. More...

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

__construct()

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

Parameters

string	$n	Magnitude
bool | string	$u	Unit

Definition at line 41 of file Length.php.

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

References $n.

Member Function Documentation

compareTo()

HTMLPurifier_Length::compareTo

(

$l

)

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

Parameters

HTMLPurifier_Length

$l

Returns

int

Warning

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

Definition at line 144 of file Length.php.

    {
        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;
    }

References $l.

getN()

HTMLPurifier_Length::getN

(

)

Retrieves string numeric magnitude.

Returns

string

Definition at line 111 of file Length.php.

    {
        return $this->n;
    }

References $n.

getUnit()

HTMLPurifier_Length::getUnit

(

)

Retrieves string unit.

Returns

string

Definition at line 120 of file Length.php.

    {
        return $this->unit;
    }

References $unit.

isValid()

HTMLPurifier_Length::isValid

(

)

Returns true if this length unit is valid.

Returns

bool

Definition at line 129 of file Length.php.

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

References $isValid, isValid(), and validate().

Referenced by isValid(), and toString().

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make()

static HTMLPurifier_Length::make (   $s )

static

Parameters

string

$s

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

Returns

HTMLPurifier_Length

Warning

Does not perform validation.

Definition at line 52 of file Length.php.

    {
        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);
    }

References $n, and $unit.

Referenced by HTMLPurifier_AttrDef_CSS_Length\__construct(), and HTMLPurifier_AttrDef_CSS_Length\validate().

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toString()

HTMLPurifier_Length::toString

(

)

Returns string representation of number.

Returns

string

Definition at line 99 of file Length.php.

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

References $unit, and isValid().

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validate()

HTMLPurifier_Length::validate ( )

protected

Validates the number and unit.

Returns

bool

Definition at line 70 of file Length.php.

    {
        // 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;
    }

References $allowedUnits, and $result.

Referenced by isValid().

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Field Documentation

$allowedUnits

HTMLPurifier_Length::$allowedUnits

staticprotected

Initial value:

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

Array Lookup array of units recognized by CSS 2.1 @type array.

Definition at line 32 of file Length.php.

Referenced by validate().

$isValid

HTMLPurifier_Length::$isValid

protected

Whether or not this length is valid.

Null if not calculated yet. @type bool

Definition at line 26 of file Length.php.

Referenced by isValid().

$n

HTMLPurifier_Length::$n

protected

String numeric magnitude.

@type string

Definition at line 14 of file Length.php.

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

$unit

HTMLPurifier_Length::$unit

protected

String unit.

False is permitted if $n = 0. @type string|bool

Definition at line 20 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