mirror of
https://github.com/ezyang/htmlpurifier.git
synced 2024-12-22 16:31:53 +00:00
Finally stabilize the unit converter.
git-svn-id: http://htmlpurifier.org/svnroot/htmlpurifier/trunk@1750 48356398-32a2-884e-a903-53898d9a118a
This commit is contained in:
Edward Z. Yang
parent
fda310f1e7
commit
d8da5ff406
2
TODO
2
TODO
@ -17,6 +17,8 @@ afraid to cast your vote for the next feature to be implemented!
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- Maintain old attribute data in tokens (configurable?)
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- Allow URIFilters to run early?
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- Lazy update of token when validating attributes?
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- Investigate how early internal structures can be accessed; this would
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prevent structures from being parsed and serialized multiple times.
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FUTURE VERSIONS
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---------------
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@ -18,6 +18,10 @@ class HTMLPurifier_AttrDef_CSS_Number extends HTMLPurifier_AttrDef
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$this->non_negative = $non_negative;
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}
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/**
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* @warning Some contexts do not pass $config, $context. These
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* variables should not be used without checking HTMLPurifier_Length
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*/
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public function validate($number, $config, $context) {
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$number = $this->parseCDATA($number);
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@ -2,7 +2,7 @@
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/**
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* Represents a measurable length, with a string numeric magnitude
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* and a unit.
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* and a unit. This object is immutable.
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*/
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class HTMLPurifier_Length
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{
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@ -10,12 +10,17 @@ class HTMLPurifier_Length
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/**
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* String numeric magnitude.
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*/
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public $n;
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protected $n;
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/**
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* String unit. False is permitted if $n = 0.
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*/
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public $unit;
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protected $unit;
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/**
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* Whether or not this length is valid. Null if not calculated yet.
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*/
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protected $isValid;
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/**
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* Lookup array of units recognized by CSS 2.1
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@ -30,8 +35,8 @@ class HTMLPurifier_Length
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* @param string $u Unit
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*/
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public function __construct($n = '0', $u = false) {
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$this->n = $n;
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$this->unit = $u;
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$this->n = (string) $n;
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$this->unit = $u !== false ? (string) $u : false;
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}
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/**
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@ -51,13 +56,15 @@ class HTMLPurifier_Length
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* @param bool $non_negative Whether or not to disable negative values.
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* @note Maybe should be put in another class.
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*/
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public function validate($non_negative = false, $config, $context) {
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protected function validate($non_negative = false) {
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// Special case:
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if ($this->n === '+0' || $this->n === '-0') $this->n = '0';
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if ($this->n === '0' && $this->unit === false) return true;
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if (!ctype_lower($this->unit)) $this->unit = strtolower($this->unit);
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if (!isset(HTMLPurifier_Length::$allowedUnits[$this->unit])) return false;
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// Hack:
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$def = new HTMLPurifier_AttrDef_CSS_Number($non_negative);
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$result = $def->validate($this->n, $config, $context);
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$result = $def->validate($this->n, false, false);
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if ($result === false) return false;
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$this->n = $result;
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return true;
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@ -67,7 +74,26 @@ class HTMLPurifier_Length
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* Returns string representation of number.
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*/
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public function toString() {
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if (!$this->isValid()) return false;
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return $this->n . $this->unit;
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}
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/**
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* Retrieves string numeric magnitude.
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*/
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public function getN() {return $this->n;}
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/**
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* Retrieves string unit.
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*/
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public function getUnit() {return $this->unit;}
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/**
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* Returns true if this length unit is valid.
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*/
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public function isValid($non_negative = false) {
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if ($this->isValid === null) $this->isValid = $this->validate($non_negative);
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return $this->isValid;
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}
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}
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@ -50,6 +50,11 @@ class HTMLPurifier_UnitConverter
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/**
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* Converts a length object of one unit into another unit.
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* @param HTMLPurifier_Length $length
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* Instance of HTMLPurifier_Length to convert. You must validate()
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* it before passing it here!
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* @param string $to_unit
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* Unit to convert to.
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* @note
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* About precision: This conversion function pays very special
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* attention to the incoming precision of values and attempts
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@ -60,39 +65,35 @@ class HTMLPurifier_UnitConverter
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* - If a number contains less than four sigfigs ($outputPrecision)
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* and this causes some decimals to be excluded, those
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* decimals will be added on.
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* - Significant digits will be ignored for quantities greater
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* than one. This is a limitation of BCMath and I don't
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* feel like coding around it.
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*/
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public function convert($length, $to_unit) {
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if ($length->n === '0' || $length->unit === false) {
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return new HTMLPurifier_Length('0', $unit);
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if (!$length->isValid()) return false;
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$n = $length->getN();
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$unit = $length->getUnit();
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if ($n === '0' || $unit === false) {
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return new HTMLPurifier_Length('0', false);
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}
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$state = $dest = false;
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$state = $dest_state = false;
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foreach (self::$units as $k => $x) {
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if (isset($x[$length->unit])) $state = $k;
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if (isset($x[$unit])) $state = $k;
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if (isset($x[$to_unit])) $dest_state = $k;
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}
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if (!$state || !$dest_state) return false;
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$n = $length->n;
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$unit = $length->unit;
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// Some calculations about the initial precision of the number;
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// this will be useful when we need to do final rounding.
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$log = (int) floor(log($n, 10));
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if (strpos($n, '.') === false) {
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$sigfigs = strlen(trim($n, '0+-'));
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} else {
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$sigfigs = strlen(ltrim($n, '0+-')) - 1; // eliminate extra decimal character
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}
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$sigfigs = $this->getSigFigs($n);
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if ($sigfigs < $this->outputPrecision) $sigfigs = $this->outputPrecision;
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// BCMath's internal precision deals only with decimals. Use
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// our default if the initial number has no decimals, or increase
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// it by how ever many decimals, thus, the number of guard digits
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// will always be greater than or equal to internalPrecision.
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$log = (int) floor(log(abs($n), 10));
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$cp = ($log < 0) ? $this->internalPrecision - $log : $this->internalPrecision; // internal precision
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for ($i = 0; $i < 2; $i++) {
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@ -113,7 +114,7 @@ class HTMLPurifier_UnitConverter
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$unit = $dest_unit;
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}
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// Output was zero, so bail out early
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// Output was zero, so bail out early. Shouldn't ever happen.
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if ($n === '') {
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$n = '0';
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$unit = $to_unit;
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@ -148,17 +149,21 @@ class HTMLPurifier_UnitConverter
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// Calculate how many decimals we need ($rp)
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// Calculations will always be carried to the decimal; this is
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// a limitation with BC (we can't set the scale to be negative)
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$new_log = (int) floor(log($n, 10));
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$new_log = (int) floor(log(abs($n), 10));
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$rp = $sigfigs - $new_log - 1;
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//echo "----\n";
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//echo "$n\nsigfigs = $sigfigs\nnew_log = $new_log\nlog = $log\nrp = $rp\n";
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$neg = $n < 0 ? '-' : '';
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// Useful for debugging:
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//echo "<pre>n";
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//echo "$n\nsigfigs = $sigfigs\nnew_log = $new_log\nlog = $log\nrp = $rp\n</pre>\n";
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if ($rp >= 0) {
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$n = bcadd($n, '0.' . str_repeat('0', $rp) . '5', $rp + 1);
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$n = bcadd($n, $neg . '0.' . str_repeat('0', $rp) . '5', $rp + 1);
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$n = bcdiv($n, '1', $rp);
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} else {
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if ($new_log + 1 >= $sigfigs) {
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$n = bcadd($n, '5' . str_repeat('0', $new_log - $sigfigs));
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$n = substr($n, 0, $sigfigs) . str_repeat('0', $new_log + 1 - $sigfigs);
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$n = bcadd($n, $neg . '5' . str_repeat('0', $new_log - $sigfigs));
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$n = substr($n, 0, $sigfigs + strlen($neg)) . str_repeat('0', $new_log + 1 - $sigfigs);
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}
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}
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if (strpos($n, '.') !== false) $n = rtrim($n, '0');
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@ -167,4 +172,21 @@ class HTMLPurifier_UnitConverter
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return new HTMLPurifier_Length($n, $unit);
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}
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/**
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* Returns the number of significant figures in a string number.
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* @param string $n Decimal number
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* @return int number of sigfigs
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*/
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public function getSigFigs($n) {
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$n = ltrim($n, '0+-');
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$dp = strpos($n, '.'); // decimal position
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if ($dp === false) {
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$sigfigs = strlen(rtrim($n, '0'));
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} else {
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$sigfigs = strlen(ltrim($n, '0.')); // eliminate extra decimal character
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if ($dp !== 0) $sigfigs--;
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}
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return $sigfigs;
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}
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}
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@ -5,14 +5,14 @@ class HTMLPurifier_LengthTest extends HTMLPurifier_Harness
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function testConstruct() {
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$l = new HTMLPurifier_Length('23', 'in');
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$this->assertIdentical($l->n, '23');
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$this->assertIdentical($l->unit, 'in');
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$this->assertIdentical($l->getN(), '23');
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$this->assertIdentical($l->getUnit(), 'in');
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}
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function testMake() {
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$l = HTMLPurifier_Length::make('+23.4in');
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$this->assertIdentical($l->n, '+23.4');
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$this->assertIdentical($l->unit, 'in');
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$this->assertIdentical($l->getN(), '+23.4');
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$this->assertIdentical($l->getUnit(), 'in');
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}
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function testToString() {
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@ -23,13 +23,15 @@ class HTMLPurifier_LengthTest extends HTMLPurifier_Harness
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protected function assertValidate($string, $expect = true, $disable_negative = false) {
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if ($expect === true) $expect = $string;
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$l = HTMLPurifier_Length::make($string);
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$result = $l->validate($disable_negative, $this->config, $this->context);
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$result = $l->isValid($disable_negative);
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if ($result === false) $this->assertIdentical($expect, false);
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else $this->assertIdentical($l->toString(), $expect);
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}
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function testValidate() {
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$this->assertValidate('0');
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$this->assertValidate('+0', '0');
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$this->assertValidate('-0', '0');
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$this->assertValidate('0px');
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$this->assertValidate('4.5px');
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$this->assertValidate('-4.5px');
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@ -3,12 +3,35 @@
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class HTMLPurifier_UnitConverterTest extends HTMLPurifier_Harness
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{
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protected function assertConversion($input, $expect) {
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$input = HTMLPurifier_Length::make($input);
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$expect = HTMLPurifier_Length::make($expect);
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protected function assertConversion($input, $expect, $unit = null, $test_negative = true) {
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$length = HTMLPurifier_Length::make($input);
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if ($expect !== false) $expectl = HTMLPurifier_Length::make($expect);
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else $expectl = false;
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$converter = new HTMLPurifier_UnitConverter();
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$result = $converter->convert($input, $expect->unit);
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$this->assertIdentical($result, $expect);
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$result = $converter->convert($length, $unit !== null ? $unit : $expectl->getUnit());
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$this->assertIdentical($result, $expectl);
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if ($test_negative) {
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$this->assertConversion(
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"-$input",
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$expect === false ? false : "-$expect",
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$unit,
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false
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);
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}
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}
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function testFail() {
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$this->assertConversion('1in', false, 'foo');
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$this->assertConversion('1foo', false, 'in');
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}
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function testZero() {
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$this->assertConversion('0', '0', 'in', false);
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$this->assertConversion('-0', '0', 'in', false);
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$this->assertConversion('0in', '0', 'in', false);
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$this->assertConversion('-0in', '0', 'in', false);
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$this->assertConversion('0in', '0', 'pt', false);
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$this->assertConversion('-0in', '0', 'pt', false);
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}
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function testEnglish() {
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@ -39,7 +62,8 @@ class HTMLPurifier_UnitConverterTest extends HTMLPurifier_Harness
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$this->assertConversion('0.3937in', '1cm');
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}
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function testRounding() {
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function testRoundingMinPrecision() {
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// One sig-fig, modified to be four, conversion rounds up
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$this->assertConversion('100pt', '1.389in');
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$this->assertConversion('1000pt', '13.89in');
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$this->assertConversion('10000pt', '138.9in');
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@ -47,4 +71,43 @@ class HTMLPurifier_UnitConverterTest extends HTMLPurifier_Harness
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$this->assertConversion('1000000pt', '13890in');
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}
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function testRoundingUserPrecision() {
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// Five sig-figs, conversion rounds down
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$this->assertConversion('11112000pt', '154330in');
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$this->assertConversion('1111200pt', '15433in');
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$this->assertConversion('111120pt', '1543.3in');
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$this->assertConversion('11112pt', '154.33in');
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$this->assertConversion('1111.2pt', '15.433in');
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$this->assertConversion('111.12pt', '1.5433in');
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$this->assertConversion('11.112pt', '0.15433in');
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}
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protected function assertSigFig($n, $sigfigs) {
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$converter = new HTMLPurifier_UnitConverter();
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$result = $converter->getSigFigs($n);
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$this->assertIdentical($result, $sigfigs);
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}
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function test_getSigFigs() {
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$this->assertSigFig('0', 0);
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$this->assertSigFig('1', 1);
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$this->assertSigFig('-1', 1);
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$this->assertSigFig('+1', 1);
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$this->assertSigFig('01', 1);
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$this->assertSigFig('001', 1);
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$this->assertSigFig('12', 2);
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$this->assertSigFig('012', 2);
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$this->assertSigFig('10', 1);
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$this->assertSigFig('10.', 2);
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$this->assertSigFig('100.', 3);
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$this->assertSigFig('103', 3);
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$this->assertSigFig('130', 2);
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$this->assertSigFig('.1', 1);
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$this->assertSigFig('0.1', 1);
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$this->assertSigFig('00.1', 1);
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$this->assertSigFig('0.01', 1);
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$this->assertSigFig('0.010', 2);
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$this->assertSigFig('0.012', 2);
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}
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}
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