Functions.php
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Functions.php
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	<?php

	/**
	* Builtin functions
	* @see https://lesscss.org/functions/
	*/
	class Less_Functions {

	public $env;
	public $currentFileInfo;

	public function __construct( $env, ?array $currentFileInfo = null ) {
	$this->env = $env;
	$this->currentFileInfo = $currentFileInfo;
	}

	private static function _clamp( $val, $max = 1 ) {
	return min( max( $val, 0 ), $max );
	}

	private static function _number( $n ) {
	if ( $n instanceof Less_Tree_Dimension ) {
	return floatval( $n->unit->is( '%' ) ? $n->value / 100 : $n->value );
	} elseif ( is_numeric( $n ) ) {
	return $n;
	} else {
	throw new Less_Exception_Compiler( "color functions take numbers as parameters" );
	}
	}

	private static function _scaled( $n, $size = 255 ) {
	if ( $n instanceof Less_Tree_Dimension && $n->unit->is( '%' ) ) {
	return (float)$n->value * $size / 100;
	} else {
	return self::_number( $n );
	}
	}

	public function rgb( $r = null, $g = null, $b = null ) {
	if ( $r === null \|\| $g === null \|\| $b === null ) {
	throw new Less_Exception_Compiler( "rgb expects three parameters" );
	}
	return $this->rgba( $r, $g, $b, 1.0 );
	}

	public function rgba( $r = null, $g = null, $b = null, $a = null ) {
	$rgb = [
	self::_scaled( $r ),
	self::_scaled( $g ),
	self::_scaled( $b )
	];

	$a = self::_number( $a );
	return new Less_Tree_Color( $rgb, $a );
	}

	public function hsl( $h, $s, $l ) {
	return $this->hsla( $h, $s, $l, 1.0 );
	}

	public function hsla( $h, $s, $l, $a ) {
	$h = fmod( self::_number( $h ), 360 ) / 360; // Classic % operator will change float to int
	$s = self::_clamp( self::_number( $s ) );
	$l = self::_clamp( self::_number( $l ) );
	$a = self::_clamp( self::_number( $a ) );

	$m2 = $l <= 0.5 ? $l * ( $s + 1 ) : $l + $s - $l * $s;

	$m1 = $l * 2 - $m2;

	return $this->rgba(
	self::hsla_hue( $h + 1 / 3, $m1, $m2 ) * 255,
	self::hsla_hue( $h, $m1, $m2 ) * 255,
	self::hsla_hue( $h - 1 / 3, $m1, $m2 ) * 255,
	$a
	);
	}

	/**
	* @param float $h
	* @param float $m1
	* @param float $m2
	*/
	public function hsla_hue( $h, $m1, $m2 ) {
	$h = $h < 0 ? $h + 1 : ( $h > 1 ? $h - 1 : $h );
	if ( $h * 6 < 1 ) {
	return $m1 + ( $m2 - $m1 ) * $h * 6;
	} elseif ( $h * 2 < 1 ) {
	return $m2;
	} elseif ( $h * 3 < 2 ) {
	return $m1 + ( $m2 - $m1 ) * ( 2 / 3 - $h ) * 6;
	} else {
	return $m1;
	}
	}

	public function hsv( $h, $s, $v ) {
	return $this->hsva( $h, $s, $v, 1.0 );
	}

	/**
	* @param Less_Tree\|float $h
	* @param Less_Tree\|float $s
	* @param Less_Tree\|float $v
	* @param float $a
	*/
	public function hsva( $h, $s, $v, $a ) {
	$h = ( ( self::_number( $h ) % 360 ) / 360 ) * 360;
	$s = self::_number( $s );
	$v = self::_number( $v );
	$a = self::_number( $a );

	$i = (int)floor( (int)( $h / 60 ) % 6 );
	$f = ( $h / 60 ) - $i;

	$vs = [
	$v,
	$v * ( 1 - $s ),
	$v * ( 1 - $f * $s ),
	$v * ( 1 - ( 1 - $f ) * $s )
	];

	$perm = [
	[ 0, 3, 1 ],
	[ 2, 0, 1 ],
	[ 1, 0, 3 ],
	[ 1, 2, 0 ],
	[ 3, 1, 0 ],
	[ 0, 1, 2 ]
	];

	return $this->rgba(
	$vs[$perm[$i][0]] * 255,
	$vs[$perm[$i][1]] * 255,
	$vs[$perm[$i][2]] * 255,
	$a
	);
	}

	public function hue( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to hue must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$c = $color->toHSL();
	return new Less_Tree_Dimension( $c['h'] );
	}

	public function saturation( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to saturation must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$c = $color->toHSL();
	return new Less_Tree_Dimension( $c['s'] * 100, '%' );
	}

	public function lightness( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to lightness must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$c = $color->toHSL();
	return new Less_Tree_Dimension( $c['l'] * 100, '%' );
	}

	public function hsvhue( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to hsvhue must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsv = $color->toHSV();
	return new Less_Tree_Dimension( $hsv['h'] );
	}

	public function hsvsaturation( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to hsvsaturation must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsv = $color->toHSV();
	return new Less_Tree_Dimension( $hsv['s'] * 100, '%' );
	}

	public function hsvvalue( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to hsvvalue must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsv = $color->toHSV();
	return new Less_Tree_Dimension( $hsv['v'] * 100, '%' );
	}

	public function red( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to red must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return new Less_Tree_Dimension( $color->rgb[0] );
	}

	public function green( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to green must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return new Less_Tree_Dimension( $color->rgb[1] );
	}

	public function blue( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to blue must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return new Less_Tree_Dimension( $color->rgb[2] );
	}

	public function alpha( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to alpha must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$c = $color->toHSL();
	return new Less_Tree_Dimension( $c['a'] );
	}

	public function luma( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to luma must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return new Less_Tree_Dimension( $color->luma() * $color->alpha * 100, '%' );
	}

	public function luminance( $color = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to luminance must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$luminance =
	( 0.2126 * $color->rgb[0] / 255 )
	+ ( 0.7152 * $color->rgb[1] / 255 )
	+ ( 0.0722 * $color->rgb[2] / 255 );

	return new Less_Tree_Dimension( $luminance * $color->alpha * 100, '%' );
	}

	public function saturate( $color = null, $amount = null, $method = null ) {
	// filter: saturate(3.2);
	// should be kept as is, so check for color
	if ( $color instanceof Less_Tree_Dimension ) {
	return null;
	}

	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to saturate must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$amount instanceof Less_Tree_Dimension ) {
	throw new Less_Exception_Compiler( 'The second argument to saturate must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsl = $color->toHSL();

	if ( isset( $method ) && $method->value === "relative" ) {
	$hsl['s'] += $hsl['s'] * $amount->value / 100;
	} else {
	$hsl['s'] += $amount->value / 100;
	} $hsl['s'] = self::_clamp( $hsl['s'] );

	return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] );
	}

	/**
	* @param Less_Tree_Color\|null $color
	* @param Less_Tree_Dimension\|null $amount
	* @param Less_Tree_Quoted\|Less_Tree_Color\|Less_Tree_Keyword\|null $method
	*/
	public function desaturate( $color = null, $amount = null, $method = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to desaturate must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$amount instanceof Less_Tree_Dimension ) {
	throw new Less_Exception_Compiler( 'The second argument to desaturate must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsl = $color->toHSL();

	if ( isset( $method ) && $method->value === "relative" ) {
	$hsl['s'] -= $hsl['s'] * $amount->value / 100;
	} else {
	$hsl['s'] -= $amount->value / 100;
	}

	$hsl['s'] = self::_clamp( $hsl['s'] );

	return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] );
	}

	public function lighten( $color = null, $amount = null, $method = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to lighten must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$amount instanceof Less_Tree_Dimension ) {
	throw new Less_Exception_Compiler( 'The second argument to lighten must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsl = $color->toHSL();

	if ( isset( $method ) && $method->value === "relative" ) {
	$hsl['l'] += $hsl['l'] * $amount->value / 100;
	} else {
	$hsl['l'] += $amount->value / 100;
	}

	$hsl['l'] = self::_clamp( $hsl['l'] );

	return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] );
	}

	public function darken( $color = null, $amount = null, $method = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to darken must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$amount instanceof Less_Tree_Dimension ) {
	throw new Less_Exception_Compiler( 'The second argument to darken must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsl = $color->toHSL();
	if ( isset( $method ) && $method->value === "relative" ) {
	$hsl['l'] -= $hsl['l'] * $amount->value / 100;
	} else {
	$hsl['l'] -= $amount->value / 100;
	}
	$hsl['l'] = self::_clamp( $hsl['l'] );

	return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] );
	}

	public function fadein( $color = null, $amount = null, $method = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to fadein must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$amount instanceof Less_Tree_Dimension ) {
	throw new Less_Exception_Compiler( 'The second argument to fadein must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsl = $color->toHSL();

	if ( isset( $method ) && $method->value === "relative" ) {
	$hsl['a'] += $hsl['a'] * $amount->value / 100;
	} else {
	$hsl['a'] += $amount->value / 100;
	}

	$hsl['a'] = self::_clamp( $hsl['a'] );
	return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] );
	}

	public function fadeout( $color = null, $amount = null, $method = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to fadeout must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$amount instanceof Less_Tree_Dimension ) {
	throw new Less_Exception_Compiler( 'The second argument to fadeout must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsl = $color->toHSL();

	if ( isset( $method ) && $method->value === "relative" ) {
	$hsl['a'] -= $hsl['a'] * $amount->value / 100;
	} else {
	$hsl['a'] -= $amount->value / 100;
	}

	$hsl['a'] = self::_clamp( $hsl['a'] );
	return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] );
	}

	public function fade( $color = null, $amount = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to fade must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$amount instanceof Less_Tree_Dimension ) {
	throw new Less_Exception_Compiler( 'The second argument to fade must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsl = $color->toHSL();

	$hsl['a'] = $amount->value / 100;
	$hsl['a'] = self::_clamp( $hsl['a'] );
	return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] );
	}

	public function spin( $color = null, $amount = null ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to spin must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$amount instanceof Less_Tree_Dimension ) {
	throw new Less_Exception_Compiler( 'The second argument to spin must be a number' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$hsl = $color->toHSL();
	$hue = fmod( $hsl['h'] + $amount->value, 360 );

	$hsl['h'] = $hue < 0 ? 360 + $hue : $hue;

	return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] );
	}

	//
	// Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein
	// https://sass-lang.com/
	//

	/**
	* @param Less_Tree\|null $color1
	* @param Less_Tree\|null $color2
	* @param Less_Tree\|null $weight
	*/
	public function mix( $color1 = null, $color2 = null, $weight = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	$type = is_object( $color1 ) ? get_class( $color1 ) : gettype( $color1 );
	throw new Less_Exception_Compiler( "The first argument must be a color, $type given" . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	$type = is_object( $color2 ) ? get_class( $color2 ) : gettype( $color2 );
	throw new Less_Exception_Compiler( "The second argument must be a color, $type given" . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$weight ) {
	$weight = new Less_Tree_Dimension( '50', '%' );
	}
	if ( !$weight instanceof Less_Tree_Dimension ) {
	$type = is_object( $weight ) ? get_class( $weight ) : gettype( $weight );
	throw new Less_Exception_Compiler( "The third argument must be a percentage, $type given" . ( $weight instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	$p = $weight->value / 100.0;
	$w = $p * 2 - 1;
	$hsl1 = $color1->toHSL();
	$hsl2 = $color2->toHSL();
	$a = $hsl1['a'] - $hsl2['a'];

	$w1 = ( ( ( ( $w * $a ) == -1 ) ? $w : ( $w + $a ) / ( 1 + $w * $a ) ) + 1 ) / 2;
	$w2 = 1 - $w1;

	$rgb = [
	$color1->rgb[0] * $w1 + $color2->rgb[0] * $w2,
	$color1->rgb[1] * $w1 + $color2->rgb[1] * $w2,
	$color1->rgb[2] * $w1 + $color2->rgb[2] * $w2
	];

	$alpha = $color1->alpha * $p + $color2->alpha * ( 1 - $p );

	return new Less_Tree_Color( $rgb, $alpha );
	}

	public function greyscale( $color ) {
	return $this->desaturate( $color, new Less_Tree_Dimension( 100, '%' ) );
	}

	public function contrast( $color, $dark = null, $light = null, $threshold = null ) {
	// filter: contrast(3.2);
	// should be kept as is, so check for color
	if ( !$color instanceof Less_Tree_Color ) {
	return null;
	}
	if ( !$light ) {
	$light = $this->rgba( 255, 255, 255, 1.0 );
	}
	if ( !$dark ) {
	$dark = $this->rgba( 0, 0, 0, 1.0 );
	}

	if ( !$dark instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to contrast must be a color' . ( $dark instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$light instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The third argument to contrast must be a color' . ( $light instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	// Figure out which is actually light and dark!
	if ( $dark->luma() > $light->luma() ) {
	$t = $light;
	$light = $dark;
	$dark = $t;
	}
	if ( !$threshold ) {
	$threshold = 0.43;
	} else {
	$threshold = self::_number( $threshold );
	}

	if ( $color->luma() < $threshold ) {
	return $light;
	} else {
	return $dark;
	}
	}

	public function e( $str ) {
	if ( is_string( $str ) ) {
	return new Less_Tree_Anonymous( $str );
	}
	return new Less_Tree_Anonymous( $str instanceof Less_Tree_JavaScript ? $str->expression : $str->value );
	}

	public function escape( $str ) {
	$revert = [ '%21' => '!', '%2A' => '*', '%27' => "'", '%3F' => '?', '%26' => '&', '%2C' => ',', '%2F' => '/', '%40' => '@', '%2B' => '+', '%24' => '$' ];

	return new Less_Tree_Anonymous( strtr( rawurlencode( $str->value ), $revert ) );
	}

	/**
	* todo: This function will need some additional work to make it work the same as less.js
	*
	*/
	public function replace( $string, $pattern, $replacement, $flags = null ) {
	$result = $string->value;

	$expr = '/' . str_replace( '/', '\\/', $pattern->value ) . '/';
	if ( $flags && $flags->value ) {
	$expr .= self::replace_flags( $flags->value );
	}
	$replacement = ( $replacement instanceof Less_Tree_Quoted ) ?
	$replacement->value : $replacement->toCSS();

	if ( $flags && $flags->value && preg_match( '/g/', $flags->value ) ) {
	$result = preg_replace( $expr, $replacement, $result );
	} else {
	$result = preg_replace( $expr, $replacement, $result, 1 );
	}

	if ( $string instanceof Less_Tree_Quoted ) {
	return new Less_Tree_Quoted( $string->quote, $result, $string->escaped );
	}
	return new Less_Tree_Quoted( '', $result );
	}

	private static function replace_flags( $flags ) {
	return str_replace( [ 'e', 'g' ], '', $flags );
	}

	public function _percent( $string, ...$args ) {
	$result = $string->value;

	foreach ( $args as $arg ) {
	if ( preg_match( '/%[sda]/i', $result, $token ) ) {
	$token = $token[0];
	$value = ( ( $arg instanceof Less_Tree_Quoted ) &&
	stristr( $token, 's' ) ? $arg->value : $arg->toCSS() );

	$value = preg_match( '/[A-Z]$/', $token ) ? urlencode( $value ) : $value;
	$result = preg_replace( '/%[sda]/i', $value, $result, 1 );
	}
	}
	$result = str_replace( '%%', '%', $result );

	if ( $string instanceof Less_Tree_Quoted ) {
	return new Less_Tree_Quoted( $string->quote, $result, $string->escaped );
	}
	return new Less_Tree_Quoted( '', $result );
	}

	public function unit( $val, $unit = null ) {
	if ( !( $val instanceof Less_Tree_Dimension ) ) {
	throw new Less_Exception_Compiler( 'The first argument to unit must be a number' . ( $val instanceof Less_Tree_Operation ? '. Have you forgotten parenthesis?' : '.' ) );
	}

	if ( $unit ) {
	if ( $unit instanceof Less_Tree_Keyword ) {
	$unit = $unit->value;
	} else {
	$unit = $unit->toCSS();
	}
	} else {
	$unit = "";
	}
	return new Less_Tree_Dimension( $val->value, $unit );
	}

	public function convert( $val, $unit ) {
	return $val->convertTo( $unit->value );
	}

	public function round( $n, $f = false ) {
	$fraction = 0;
	if ( $f !== false ) {
	$fraction = $f->value;
	}

	return $this->_math( [ Less_Parser::class, 'round' ], null, $n, $fraction );
	}

	public function pi() {
	return new Less_Tree_Dimension( M_PI );
	}

	public function mod( $a, $b ) {
	return new Less_Tree_Dimension( $a->value % $b->value, $a->unit );
	}

	public function pow( $x, $y ) {
	if ( is_numeric( $x ) && is_numeric( $y ) ) {
	$x = new Less_Tree_Dimension( $x );
	$y = new Less_Tree_Dimension( $y );
	} elseif ( !( $x instanceof Less_Tree_Dimension ) \|\| !( $y instanceof Less_Tree_Dimension ) ) {
	throw new Less_Exception_Compiler( 'Arguments must be numbers' );
	}

	return new Less_Tree_Dimension( pow( $x->value, $y->value ), $x->unit );
	}

	// var mathFunctions = [{name:"ce ...
	public function ceil( $n ) {
	return $this->_math( 'ceil', null, $n );
	}

	public function floor( $n ) {
	return $this->_math( 'floor', null, $n );
	}

	public function sqrt( $n ) {
	return $this->_math( 'sqrt', null, $n );
	}

	public function abs( $n ) {
	return $this->_math( 'abs', null, $n );
	}

	public function tan( $n ) {
	return $this->_math( 'tan', '', $n );
	}

	public function sin( $n ) {
	return $this->_math( 'sin', '', $n );
	}

	public function cos( $n ) {
	return $this->_math( 'cos', '', $n );
	}

	public function atan( $n ) {
	return $this->_math( 'atan', 'rad', $n );
	}

	public function asin( $n ) {
	return $this->_math( 'asin', 'rad', $n );
	}

	public function acos( $n ) {
	return $this->_math( 'acos', 'rad', $n );
	}

	private function _math( $fn, $unit, ...$args ) {
	if ( $args[0] instanceof Less_Tree_Dimension ) {
	if ( $unit === null ) {
	$unit = $args[0]->unit;
	} else {
	$args[0] = $args[0]->unify();
	}
	$args[0] = (float)$args[0]->value;
	return new Less_Tree_Dimension( $fn( ...$args ), $unit );
	} elseif ( is_numeric( $args[0] ) ) {
	return $fn( ...$args );
	} else {
	throw new Less_Exception_Compiler( "math functions take numbers as parameters" );
	}
	}

	/**
	* @param bool $isMin
	* @param array<Less_Tree> $args
	* @see less-2.5.3.js#minMax
	*/
	private function _minMax( $isMin, $args ) {
	$arg_count = count( $args );

	if ( $arg_count < 1 ) {
	throw new Less_Exception_Compiler( 'one or more arguments required' );
	}

	$j = null;
	$unitClone = null;
	$unitStatic = null;

	// elems only contains original argument values.
	$order = [];
	// key is the unit.toString() for unified tree.Dimension values,
	// value is the index into the order array.
	$values = [];

	for ( $i = 0; $i < $arg_count; $i++ ) {
	$current = $args[$i];
	if ( !( $current instanceof Less_Tree_Dimension ) ) {
	if ( $args[$i] instanceof Less_Tree_HasValueProperty && is_array( $args[$i]->value ) ) {
	$args[] = $args[$i]->value;
	}
	continue;
	}
	// PhanTypeInvalidDimOffset -- False positive, safe after continue or non-first iterations
	'@phan-var non-empty-list<Less_Tree_Dimension> $order';

	if ( $current->unit->toString() === '' && !$unitClone ) {
	$temp = new Less_Tree_Dimension( $current->value, $unitClone );
	$currentUnified = $temp->unify();
	} else {
	$currentUnified = $current->unify();
	}

	if ( $currentUnified->unit->toString() === "" && !$unitStatic ) {
	$unit = $unitStatic;
	} else {
	$unit = $currentUnified->unit->toString();
	}

	if ( ( $unit !== '' && !$unitStatic ) \|\| ( $unit !== '' && $order[0]->unify()->unit->toString() === "" ) ) {
	$unitStatic = $unit;
	}

	if ( $unit != '' && !$unitClone ) {
	$unitClone = $current->unit->toString();
	}

	if ( isset( $values[''] ) && $unit !== '' && $unit === $unitStatic ) {
	$j = $values[''];
	} elseif ( isset( $values[$unit] ) ) {
	$j = $values[$unit];
	} else {

	if ( $unitStatic && $unit !== $unitStatic ) {
	throw new Less_Exception_Compiler( 'incompatible types' );
	}
	$values[$unit] = count( $order );
	$order[] = $current;
	continue;
	}

	if ( $order[$j]->unit->toString() === "" && $unitClone ) {
	$temp = new Less_Tree_Dimension( $order[$j]->value, $unitClone );
	$referenceUnified = $temp->unify();
	} else {
	$referenceUnified = $order[$j]->unify();
	}
	if ( ( $isMin && $currentUnified->value < $referenceUnified->value ) \|\| ( !$isMin && $currentUnified->value > $referenceUnified->value ) ) {
	$order[$j] = $current;
	}
	}

	if ( count( $order ) == 1 ) {
	return $order[0];
	}
	$args = [];
	foreach ( $order as $a ) {
	$args[] = $a->toCSS();
	}
	return new Less_Tree_Anonymous( ( $isMin ? 'min(' : 'max(' ) . implode( ( Less_Parser::$options['compress'] ? ',' : ', ' ), $args ) . ')' );
	}

	public function min( ...$args ) {
	return $this->_minMax( true, $args );
	}

	public function max( ...$args ) {
	return $this->_minMax( false, $args );
	}

	public function getunit( $n ) {
	return new Less_Tree_Anonymous( $n->unit );
	}

	public function argb( $color ) {
	if ( !$color instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to argb must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return new Less_Tree_Anonymous( $color->toARGB() );
	}

	public function percentage( $n ) {
	return new Less_Tree_Dimension( $n->value * 100, '%' );
	}

	/**
	* @see less-2.5.3.js#colorFunctions.color
	* @param Less_Tree_Quoted\|Less_Tree_Color\|Less_Tree_Keyword $c
	* @return Less_Tree_Color
	*/
	public function color( $c ) {
	if ( ( $c instanceof Less_Tree_Quoted ) &&
	preg_match( '/^#([a-f0-9]{6}\|[a-f0-9]{3})/', $c->value )
	) {
	return new Less_Tree_Color( substr( $c->value, 1 ) );
	}

	// phpcs:ignore Generic.CodeAnalysis.AssignmentInCondition
	if ( ( $c instanceof Less_Tree_Color ) \|\| ( $c = Less_Tree_Color::fromKeyword( $c->value ) ) ) {
	$c->value = null;
	return $c;
	}

	throw new Less_Exception_Compiler( "argument must be a color keyword or 3/6 digit hex e.g. #FFF" );
	}

	public function isruleset( $n ) {
	return new Less_Tree_Keyword( $n instanceof Less_Tree_DetachedRuleset ? 'true' : 'false' );
	}

	public function iscolor( $n ) {
	return new Less_Tree_Keyword( $n instanceof Less_Tree_Color ? 'true' : 'false' );
	}

	public function isnumber( $n ) {
	return new Less_Tree_Keyword( $n instanceof Less_Tree_Dimension ? 'true' : 'false' );
	}

	public function isstring( $n ) {
	return new Less_Tree_Keyword( $n instanceof Less_Tree_Quoted ? 'true' : 'false' );
	}

	public function iskeyword( $n ) {
	return new Less_Tree_Keyword( $n instanceof Less_Tree_Keyword ? 'true' : 'false' );
	}

	public function isurl( $n ) {
	return new Less_Tree_Keyword( $n instanceof Less_Tree_Url ? 'true' : 'false' );
	}

	public function ispixel( $n ) {
	return $this->isunit( $n, 'px' );
	}

	public function ispercentage( $n ) {
	return $this->isunit( $n, '%' );
	}

	public function isem( $n ) {
	return $this->isunit( $n, 'em' );
	}

	/**
	* @param Less_Tree $n
	* @param Less_Tree\|string $unit
	*/
	public function isunit( $n, $unit ) {
	if ( $unit instanceof Less_Tree_Keyword \|\| $unit instanceof Less_Tree_Quoted ) {
	$unit = $unit->value;
	}

	return new Less_Tree_Keyword( $n instanceof Less_Tree_Dimension && $n->unit->is( $unit ) ? 'true' : 'false' );
	}

	public function tint( $color, $amount = null ) {
	return $this->mix( $this->rgb( 255, 255, 255 ), $color, $amount );
	}

	public function shade( $color, $amount = null ) {
	return $this->mix( $this->rgb( 0, 0, 0 ), $color, $amount );
	}

	/**
	* @see less-3.13.1.js#functions _SELF
	*/
	public function _self( $args ) {
	return $args;
	}

	public function extract( $values, $index ) {
	$index = (int)$index->value - 1; // (1-based index)
	// handle non-array values as an array of length 1
	// return 'undefined' if index is invalid
	if ( !( $values instanceof Less_Tree_Color ) && is_array( $values->value ) ) {
	if ( isset( $values->value[$index] ) ) {
	return $values->value[$index];
	}
	return null;

	} elseif ( (int)$index === 0 ) {
	return $values;
	}

	return null;
	}

	public function length( $values ) {
	$n = ( $values instanceof Less_Tree_Expression \|\| $values instanceof Less_Tree_Value ) ?
	count( $values->value ) : 1;
	return new Less_Tree_Dimension( $n );
	}

	/**
	* @see less-2.5.3.js#data-uri
	*/
	public function datauri( $mimetypeNode, $filePathNode = null ) {
	if ( !$filePathNode ) {
	$filePathNode = $mimetypeNode;
	$mimetypeNode = null;
	}

	$filePath = $filePathNode->value;
	$mimetype = ( $mimetypeNode ? $mimetypeNode->value : null );

	$filePath = str_replace( '\\', '/', $filePath );
	$fragmentStart = strpos( $filePath, '#' );
	$fragment = '';
	if ( $fragmentStart !== false ) {
	$fragment = substr( $filePath, $fragmentStart );
	$filePath = substr( $filePath, 0, $fragmentStart );
	}

	[ $filePath ] = Less_FileManager::getFilePath( $filePath, $this->currentFileInfo );

	// detect the mimetype if not given
	if ( !$mimetype ) {

	$mimetype = Less_Mime::lookup( $filePath );

	if ( $mimetype === "image/svg+xml" ) {
	$useBase64 = false;
	} else {
	$charset = Less_Mime::charsets_lookup( $mimetype );
	$useBase64 = !in_array( $charset, [ 'US-ASCII', 'UTF-8' ] );
	}
	if ( $useBase64 ) {
	$mimetype .= ';base64';
	}

	} else {
	$useBase64 = preg_match( '/;base64$/', $mimetype );
	}

	if ( !file_exists( $filePath ) ) {
	$fallback = new Less_Tree_Url( ( $filePathNode ?: $mimetypeNode ), $this->currentFileInfo );
	return $fallback->compile( $this->env );
	}
	$buf = @file_get_contents( $filePath );

	$buf = $useBase64 ? base64_encode( $buf ) : rawurlencode( $buf );
	$url = "data:" . $mimetype . ',' . $buf . $fragment;

	// IE8 cannot handle a data-uri larger than 32KB. If this is exceeded
	// and the --ieCompat flag is enabled, return a normal url() instead.
	$DATA_URI_MAX_KB = 32768;
	if ( strlen( $buf ) >= $DATA_URI_MAX_KB ) {
	// NOTE: Less.js checks for ieCompat here (true by default).
	// For Less.php, ieCompat is not configurable, and always true.
	$fallback = new Less_Tree_Url( ( $filePathNode ?: $mimetypeNode ), $this->currentFileInfo );
	return $fallback->compile( $this->env );
	}

	return new Less_Tree_Url( new Less_Tree_Quoted( '"' . $url . '"', $url, false ) );
	}

	// svg-gradient
	public function svggradient( $direction, ...$stops ) {
	$throw_message = 'svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position]';

	if ( count( $stops ) < 2 ) {
	throw new Less_Exception_Compiler( $throw_message );
	}

	$gradientType = 'linear';
	$rectangleDimension = 'x="0" y="0" width="1" height="1"';
	$directionValue = $direction->toCSS();

	switch ( $directionValue ) {
	case "to bottom":
	$gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"';
	break;
	case "to right":
	$gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"';
	break;
	case "to bottom right":
	$gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"';
	break;
	case "to top right":
	$gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"';
	break;
	case "ellipse":
	case "ellipse at center":
	$gradientType = "radial";
	$gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"';
	$rectangleDimension = 'x="-50" y="-50" width="101" height="101"';
	break;
	default:
	throw new Less_Exception_Compiler( "svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center'" );
	}

	$returner = '<?xml version="1.0" ?>' .
	'<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" viewBox="0 0 1 1" preserveAspectRatio="none">' .
	'<' . $gradientType . 'Gradient id="gradient" gradientUnits="userSpaceOnUse" ' . $gradientDirectionSvg . '>';

	for ( $i = 0; $i < count( $stops ); $i++ ) {

	if ( $stops[$i] instanceof Less_Tree_Expression ) {
	$color = $stops[$i]->value[0];
	$position = $stops[$i]->value[1];
	} else {
	$color = $stops[$i];
	$position = null;
	}

	if ( !( $color instanceof Less_Tree_Color ) \|\| ( !( ( $i === 0 \|\| $i + 1 === count( $stops ) ) && $position === null ) && !( $position instanceof Less_Tree_Dimension ) ) ) {
	throw new Less_Exception_Compiler( $throw_message );
	}
	if ( $position ) {
	$positionValue = $position->toCSS();
	} elseif ( $i === 0 ) {
	$positionValue = '0%';
	} else {
	$positionValue = '100%';
	}
	$alpha = $color->alpha;
	$returner .= '<stop offset="' . $positionValue . '" stop-color="' . $color->toRGB() . '"' . ( $alpha < 1 ? ' stop-opacity="' . $alpha . '"' : '' ) . '/>';
	}

	$returner .= '</' . $gradientType . 'Gradient><rect ' . $rectangleDimension . ' fill="url(#gradient)" /></svg>';

	$revert = [ '%21' => '!', '%2A' => '*', '%27' => "'", '%26' => '&', '%2C' => ',', '%40' => '@', '%2B' => '+', '%24' => '$', '%28' => '(', '%29' => ')' ];
	$returner = strtr( rawurlencode( $returner ), $revert );

	$returner = "data:image/svg+xml," . $returner;

	return new Less_Tree_Url( new Less_Tree_Quoted( "'" . $returner . "'", $returner, false ) );
	}

	/**
	* @see https://github.com/less/less.js/blob/v2.5.3/lib/less-node/image-size.js
	*/
	private function getImageSize( $filePathNode ) {
	$filePath = $filePathNode->value;

	$filePath = str_replace( '\\', '/', $filePath );

	[ $filePath ] = Less_FileManager::getFilePath( $filePath, $this->currentFileInfo );

	$mimetype = Less_Mime::lookup( $filePath );

	if ( $mimetype === "image/svg+xml" ) {
	return $this->getSvgSize( $filePath );
	}

	[ $imagewidth, $imageheight ] = getimagesize( $filePath );

	return [ "width" => $imagewidth, "height" => $imageheight ];
	}

	/**
	* @see https://github.com/image-size/image-size/blob/main/lib/types/svg.ts
	*/
	private function getSvgSize( string $filePathNode ) {
	$xml = simplexml_load_string( file_get_contents( $filePathNode ) );
	$attributes = $xml->attributes();
	$width = (string)$attributes->width;
	$height = (string)$attributes->height;

	return [ "width" => $width, "height" => $height ];
	}

	public function imagesize( $filePathNode = null ) {
	$imagesize = $this->getImageSize( $filePathNode );
	return new Less_Tree_Expression( [
	new Less_Tree_Dimension( $imagesize["width"], "px" ),
	new Less_Tree_Dimension( $imagesize["height"], "px" )
	] );
	}

	public function imagewidth( $filePathNode = null ) {
	$imagesize = $this->getImageSize( $filePathNode );
	return new Less_Tree_Dimension( $imagesize["width"], "px" );
	}

	public function imageheight( $filePathNode = null ) {
	$imagesize = $this->getImageSize( $filePathNode );
	return new Less_Tree_Dimension( $imagesize["height"], "px" );
	}

	// Color Blending
	// ref: https://www.w3.org/TR/compositing-1/
	public function colorBlend( $mode, $color1, $color2 ) {
	// backdrop
	$ab = $color1->alpha;
	// source
	$as = $color2->alpha;
	$result = [];

	$ar = $as + $ab * ( 1 - $as );
	for ( $i = 0; $i < 3; $i++ ) {
	$cb = $color1->rgb[$i] / 255;
	$cs = $color2->rgb[$i] / 255;
	$cr = $mode( $cb, $cs );
	if ( $ar ) {
	$cr = ( $as * $cs + $ab * ( $cb - $as * ( $cb + $cs - $cr ) ) ) / $ar;
	}
	$result[$i] = $cr * 255;
	}

	return new Less_Tree_Color( $result, $ar );
	}

	public function multiply( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to multiply must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to multiply must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendMultiply' ], $color1, $color2 );
	}

	private function colorBlendMultiply( $cb, $cs ) {
	return $cb * $cs;
	}

	public function screen( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to screen must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to screen must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendScreen' ], $color1, $color2 );
	}

	private function colorBlendScreen( $cb, $cs ) {
	return $cb + $cs - $cb * $cs;
	}

	public function overlay( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to overlay must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to overlay must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendOverlay' ], $color1, $color2 );
	}

	private function colorBlendOverlay( $cb, $cs ) {
	$cb *= 2;
	return ( $cb <= 1 )
	? $this->colorBlendMultiply( $cb, $cs )
	: $this->colorBlendScreen( $cb - 1, $cs );
	}

	public function softlight( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to softlight must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to softlight must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendSoftlight' ], $color1, $color2 );
	}

	private function colorBlendSoftlight( $cb, $cs ) {
	$d = 1;
	$e = $cb;
	if ( $cs > 0.5 ) {
	$e = 1;
	$d = ( $cb > 0.25 ) ? sqrt( $cb )
	: ( ( 16 * $cb - 12 ) * $cb + 4 ) * $cb;
	}
	return $cb - ( 1 - 2 * $cs ) * $e * ( $d - $cb );
	}

	public function hardlight( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to hardlight must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to hardlight must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendHardlight' ], $color1, $color2 );
	}

	private function colorBlendHardlight( $cb, $cs ) {
	return $this->colorBlendOverlay( $cs, $cb );
	}

	public function difference( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to difference must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to difference must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendDifference' ], $color1, $color2 );
	}

	private function colorBlendDifference( $cb, $cs ) {
	return abs( $cb - $cs );
	}

	public function exclusion( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to exclusion must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to exclusion must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendExclusion' ], $color1, $color2 );
	}

	private function colorBlendExclusion( $cb, $cs ) {
	return $cb + $cs - 2 * $cb * $cs;
	}

	public function average( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to average must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to average must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendAverage' ], $color1, $color2 );
	}

	// non-w3c functions:
	private function colorBlendAverage( $cb, $cs ) {
	return ( $cb + $cs ) / 2;
	}

	public function negation( $color1 = null, $color2 = null ) {
	if ( !$color1 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The first argument to negation must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}
	if ( !$color2 instanceof Less_Tree_Color ) {
	throw new Less_Exception_Compiler( 'The second argument to negation must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) );
	}

	return $this->colorBlend( [ $this, 'colorBlendNegation' ], $color1, $color2 );
	}

	private function colorBlendNegation( $cb, $cs ) {
	return 1 - abs( $cb + $cs - 1 );
	}

	// ~ End of Color Blending

	}

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