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| 1 | <?php |
| 2 | |
| 3 | /** |
| 4 | * Builtin functions |
| 5 | * @see https://lesscss.org/functions/ |
| 6 | */ |
| 7 | class Less_Functions { |
| 8 | |
| 9 | public $env; |
| 10 | public $currentFileInfo; |
| 11 | |
| 12 | public function __construct( $env, array $currentFileInfo = null ) { |
| 13 | $this->env = $env; |
| 14 | $this->currentFileInfo = $currentFileInfo; |
| 15 | } |
| 16 | |
| 17 | /** |
| 18 | * @param string $op |
| 19 | * @param float $a |
| 20 | * @param float $b |
| 21 | */ |
| 22 | public static function operate( $op, $a, $b ) { |
| 23 | switch ( $op ) { |
| 24 | case '+': |
| 25 | return $a + $b; |
| 26 | case '-': |
| 27 | return $a - $b; |
| 28 | case '*': |
| 29 | return $a * $b; |
| 30 | case '/': |
| 31 | return $a / $b; |
| 32 | } |
| 33 | } |
| 34 | |
| 35 | public static function clamp( $val, $max = 1 ) { |
| 36 | return min( max( $val, 0 ), $max ); |
| 37 | } |
| 38 | |
| 39 | public static function fround( $value ) { |
| 40 | if ( $value === 0 ) { |
| 41 | return $value; |
| 42 | } |
| 43 | |
| 44 | if ( Less_Parser::$options['numPrecision'] ) { |
| 45 | $p = pow( 10, Less_Parser::$options['numPrecision'] ); |
| 46 | return round( $value * $p ) / $p; |
| 47 | } |
| 48 | return $value; |
| 49 | } |
| 50 | |
| 51 | public static function number( $n ) { |
| 52 | if ( $n instanceof Less_Tree_Dimension ) { |
| 53 | return floatval( $n->unit->is( '%' ) ? $n->value / 100 : $n->value ); |
| 54 | } elseif ( is_numeric( $n ) ) { |
| 55 | return $n; |
| 56 | } else { |
| 57 | throw new Less_Exception_Compiler( "color functions take numbers as parameters" ); |
| 58 | } |
| 59 | } |
| 60 | |
| 61 | public static function scaled( $n, $size = 255 ) { |
| 62 | if ( $n instanceof Less_Tree_Dimension && $n->unit->is( '%' ) ) { |
| 63 | return (float)$n->value * $size / 100; |
| 64 | } else { |
| 65 | return self::number( $n ); |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | public function rgb( $r = null, $g = null, $b = null ) { |
| 70 | if ( $r === null || $g === null || $b === null ) { |
| 71 | throw new Less_Exception_Compiler( "rgb expects three parameters" ); |
| 72 | } |
| 73 | return $this->rgba( $r, $g, $b, 1.0 ); |
| 74 | } |
| 75 | |
| 76 | public function rgba( $r = null, $g = null, $b = null, $a = null ) { |
| 77 | $rgb = [ $r, $g, $b ]; |
| 78 | $rgb = array_map( [ __CLASS__, 'scaled' ], $rgb ); |
| 79 | |
| 80 | $a = self::number( $a ); |
| 81 | return new Less_Tree_Color( $rgb, $a ); |
| 82 | } |
| 83 | |
| 84 | public function hsl( $h, $s, $l ) { |
| 85 | return $this->hsla( $h, $s, $l, 1.0 ); |
| 86 | } |
| 87 | |
| 88 | public function hsla( $h, $s, $l, $a ) { |
| 89 | $h = fmod( self::number( $h ), 360 ) / 360; // Classic % operator will change float to int |
| 90 | $s = self::clamp( self::number( $s ) ); |
| 91 | $l = self::clamp( self::number( $l ) ); |
| 92 | $a = self::clamp( self::number( $a ) ); |
| 93 | |
| 94 | $m2 = $l <= 0.5 ? $l * ( $s + 1 ) : $l + $s - $l * $s; |
| 95 | |
| 96 | $m1 = $l * 2 - $m2; |
| 97 | |
| 98 | return $this->rgba( |
| 99 | self::hsla_hue( $h + 1 / 3, $m1, $m2 ) * 255, |
| 100 | self::hsla_hue( $h, $m1, $m2 ) * 255, |
| 101 | self::hsla_hue( $h - 1 / 3, $m1, $m2 ) * 255, |
| 102 | $a |
| 103 | ); |
| 104 | } |
| 105 | |
| 106 | /** |
| 107 | * @param float $h |
| 108 | * @param float $m1 |
| 109 | * @param float $m2 |
| 110 | */ |
| 111 | public function hsla_hue( $h, $m1, $m2 ) { |
| 112 | $h = $h < 0 ? $h + 1 : ( $h > 1 ? $h - 1 : $h ); |
| 113 | if ( $h * 6 < 1 ) { |
| 114 | return $m1 + ( $m2 - $m1 ) * $h * 6; |
| 115 | } elseif ( $h * 2 < 1 ) { |
| 116 | return $m2; |
| 117 | } elseif ( $h * 3 < 2 ) { |
| 118 | return $m1 + ( $m2 - $m1 ) * ( 2 / 3 - $h ) * 6; |
| 119 | } else { |
| 120 | return $m1; |
| 121 | } |
| 122 | } |
| 123 | |
| 124 | public function hsv( $h, $s, $v ) { |
| 125 | return $this->hsva( $h, $s, $v, 1.0 ); |
| 126 | } |
| 127 | |
| 128 | /** |
| 129 | * @param Less_Tree|float $h |
| 130 | * @param Less_Tree|float $s |
| 131 | * @param Less_Tree|float $v |
| 132 | * @param float $a |
| 133 | */ |
| 134 | public function hsva( $h, $s, $v, $a ) { |
| 135 | $h = ( ( self::number( $h ) % 360 ) / 360 ) * 360; |
| 136 | $s = self::number( $s ); |
| 137 | $v = self::number( $v ); |
| 138 | $a = self::number( $a ); |
| 139 | |
| 140 | $i = floor( (int)( $h / 60 ) % 6 ); |
| 141 | $f = ( $h / 60 ) - $i; |
| 142 | |
| 143 | $vs = [ |
| 144 | $v, |
| 145 | $v * ( 1 - $s ), |
| 146 | $v * ( 1 - $f * $s ), |
| 147 | $v * ( 1 - ( 1 - $f ) * $s ) |
| 148 | ]; |
| 149 | |
| 150 | $perm = [ |
| 151 | [ 0, 3, 1 ], |
| 152 | [ 2, 0, 1 ], |
| 153 | [ 1, 0, 3 ], |
| 154 | [ 1, 2, 0 ], |
| 155 | [ 3, 1, 0 ], |
| 156 | [ 0, 1, 2 ] |
| 157 | ]; |
| 158 | |
| 159 | return $this->rgba( |
| 160 | $vs[$perm[$i][0]] * 255, |
| 161 | $vs[$perm[$i][1]] * 255, |
| 162 | $vs[$perm[$i][2]] * 255, |
| 163 | $a |
| 164 | ); |
| 165 | } |
| 166 | |
| 167 | public function hue( $color = null ) { |
| 168 | if ( !$color instanceof Less_Tree_Color ) { |
| 169 | throw new Less_Exception_Compiler( 'The first argument to hue must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 170 | } |
| 171 | |
| 172 | $c = $color->toHSL(); |
| 173 | return new Less_Tree_Dimension( Less_Parser::round( $c['h'] ) ); |
| 174 | } |
| 175 | |
| 176 | public function saturation( $color = null ) { |
| 177 | if ( !$color instanceof Less_Tree_Color ) { |
| 178 | throw new Less_Exception_Compiler( 'The first argument to saturation must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 179 | } |
| 180 | |
| 181 | $c = $color->toHSL(); |
| 182 | return new Less_Tree_Dimension( Less_Parser::round( $c['s'] * 100 ), '%' ); |
| 183 | } |
| 184 | |
| 185 | public function lightness( $color = null ) { |
| 186 | if ( !$color instanceof Less_Tree_Color ) { |
| 187 | throw new Less_Exception_Compiler( 'The first argument to lightness must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 188 | } |
| 189 | |
| 190 | $c = $color->toHSL(); |
| 191 | return new Less_Tree_Dimension( Less_Parser::round( $c['l'] * 100 ), '%' ); |
| 192 | } |
| 193 | |
| 194 | public function hsvhue( $color = null ) { |
| 195 | if ( !$color instanceof Less_Tree_Color ) { |
| 196 | throw new Less_Exception_Compiler( 'The first argument to hsvhue must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 197 | } |
| 198 | |
| 199 | $hsv = $color->toHSV(); |
| 200 | return new Less_Tree_Dimension( Less_Parser::round( $hsv['h'] ) ); |
| 201 | } |
| 202 | |
| 203 | public function hsvsaturation( $color = null ) { |
| 204 | if ( !$color instanceof Less_Tree_Color ) { |
| 205 | throw new Less_Exception_Compiler( 'The first argument to hsvsaturation must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 206 | } |
| 207 | |
| 208 | $hsv = $color->toHSV(); |
| 209 | return new Less_Tree_Dimension( Less_Parser::round( $hsv['s'] * 100 ), '%' ); |
| 210 | } |
| 211 | |
| 212 | public function hsvvalue( $color = null ) { |
| 213 | if ( !$color instanceof Less_Tree_Color ) { |
| 214 | throw new Less_Exception_Compiler( 'The first argument to hsvvalue must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 215 | } |
| 216 | |
| 217 | $hsv = $color->toHSV(); |
| 218 | return new Less_Tree_Dimension( Less_Parser::round( $hsv['v'] * 100 ), '%' ); |
| 219 | } |
| 220 | |
| 221 | public function red( $color = null ) { |
| 222 | if ( !$color instanceof Less_Tree_Color ) { |
| 223 | throw new Less_Exception_Compiler( 'The first argument to red must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 224 | } |
| 225 | |
| 226 | return new Less_Tree_Dimension( $color->rgb[0] ); |
| 227 | } |
| 228 | |
| 229 | public function green( $color = null ) { |
| 230 | if ( !$color instanceof Less_Tree_Color ) { |
| 231 | throw new Less_Exception_Compiler( 'The first argument to green must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 232 | } |
| 233 | |
| 234 | return new Less_Tree_Dimension( $color->rgb[1] ); |
| 235 | } |
| 236 | |
| 237 | public function blue( $color = null ) { |
| 238 | if ( !$color instanceof Less_Tree_Color ) { |
| 239 | throw new Less_Exception_Compiler( 'The first argument to blue must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 240 | } |
| 241 | |
| 242 | return new Less_Tree_Dimension( $color->rgb[2] ); |
| 243 | } |
| 244 | |
| 245 | public function alpha( $color = null ) { |
| 246 | if ( !$color instanceof Less_Tree_Color ) { |
| 247 | throw new Less_Exception_Compiler( 'The first argument to alpha must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 248 | } |
| 249 | |
| 250 | $c = $color->toHSL(); |
| 251 | return new Less_Tree_Dimension( $c['a'] ); |
| 252 | } |
| 253 | |
| 254 | public function luma( $color = null ) { |
| 255 | if ( !$color instanceof Less_Tree_Color ) { |
| 256 | throw new Less_Exception_Compiler( 'The first argument to luma must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 257 | } |
| 258 | |
| 259 | return new Less_Tree_Dimension( Less_Parser::round( $color->luma() * $color->alpha * 100 ), '%' ); |
| 260 | } |
| 261 | |
| 262 | public function luminance( $color = null ) { |
| 263 | if ( !$color instanceof Less_Tree_Color ) { |
| 264 | throw new Less_Exception_Compiler( 'The first argument to luminance must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 265 | } |
| 266 | |
| 267 | $luminance = |
| 268 | ( 0.2126 * $color->rgb[0] / 255 ) |
| 269 | + ( 0.7152 * $color->rgb[1] / 255 ) |
| 270 | + ( 0.0722 * $color->rgb[2] / 255 ); |
| 271 | |
| 272 | return new Less_Tree_Dimension( Less_Parser::round( $luminance * $color->alpha * 100 ), '%' ); |
| 273 | } |
| 274 | |
| 275 | public function saturate( $color = null, $amount = null ) { |
| 276 | // filter: saturate(3.2); |
| 277 | // should be kept as is, so check for color |
| 278 | if ( $color instanceof Less_Tree_Dimension ) { |
| 279 | return null; |
| 280 | } |
| 281 | |
| 282 | if ( !$color instanceof Less_Tree_Color ) { |
| 283 | throw new Less_Exception_Compiler( 'The first argument to saturate must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 284 | } |
| 285 | if ( !$amount instanceof Less_Tree_Dimension ) { |
| 286 | throw new Less_Exception_Compiler( 'The second argument to saturate must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 287 | } |
| 288 | |
| 289 | $hsl = $color->toHSL(); |
| 290 | |
| 291 | $hsl['s'] += $amount->value / 100; |
| 292 | $hsl['s'] = self::clamp( $hsl['s'] ); |
| 293 | |
| 294 | return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] ); |
| 295 | } |
| 296 | |
| 297 | /** |
| 298 | * @param Less_Tree_Color|null $color |
| 299 | * @param Less_Tree_Dimension|null $amount |
| 300 | */ |
| 301 | public function desaturate( $color = null, $amount = null ) { |
| 302 | if ( !$color instanceof Less_Tree_Color ) { |
| 303 | throw new Less_Exception_Compiler( 'The first argument to desaturate must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 304 | } |
| 305 | if ( !$amount instanceof Less_Tree_Dimension ) { |
| 306 | throw new Less_Exception_Compiler( 'The second argument to desaturate must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 307 | } |
| 308 | |
| 309 | $hsl = $color->toHSL(); |
| 310 | $hsl['s'] -= $amount->value / 100; |
| 311 | $hsl['s'] = self::clamp( $hsl['s'] ); |
| 312 | |
| 313 | return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] ); |
| 314 | } |
| 315 | |
| 316 | public function lighten( $color = null, $amount = null ) { |
| 317 | if ( !$color instanceof Less_Tree_Color ) { |
| 318 | throw new Less_Exception_Compiler( 'The first argument to lighten must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 319 | } |
| 320 | if ( !$amount instanceof Less_Tree_Dimension ) { |
| 321 | throw new Less_Exception_Compiler( 'The second argument to lighten must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 322 | } |
| 323 | |
| 324 | $hsl = $color->toHSL(); |
| 325 | |
| 326 | $hsl['l'] += $amount->value / 100; |
| 327 | $hsl['l'] = self::clamp( $hsl['l'] ); |
| 328 | |
| 329 | return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] ); |
| 330 | } |
| 331 | |
| 332 | public function darken( $color = null, $amount = null ) { |
| 333 | if ( !$color instanceof Less_Tree_Color ) { |
| 334 | throw new Less_Exception_Compiler( 'The first argument to darken must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 335 | } |
| 336 | if ( !$amount instanceof Less_Tree_Dimension ) { |
| 337 | throw new Less_Exception_Compiler( 'The second argument to darken must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 338 | } |
| 339 | |
| 340 | $hsl = $color->toHSL(); |
| 341 | $hsl['l'] -= $amount->value / 100; |
| 342 | $hsl['l'] = self::clamp( $hsl['l'] ); |
| 343 | |
| 344 | return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] ); |
| 345 | } |
| 346 | |
| 347 | public function fadein( $color = null, $amount = null ) { |
| 348 | if ( !$color instanceof Less_Tree_Color ) { |
| 349 | throw new Less_Exception_Compiler( 'The first argument to fadein must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 350 | } |
| 351 | if ( !$amount instanceof Less_Tree_Dimension ) { |
| 352 | throw new Less_Exception_Compiler( 'The second argument to fadein must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 353 | } |
| 354 | |
| 355 | $hsl = $color->toHSL(); |
| 356 | $hsl['a'] += $amount->value / 100; |
| 357 | $hsl['a'] = self::clamp( $hsl['a'] ); |
| 358 | return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] ); |
| 359 | } |
| 360 | |
| 361 | public function fadeout( $color = null, $amount = null ) { |
| 362 | if ( !$color instanceof Less_Tree_Color ) { |
| 363 | throw new Less_Exception_Compiler( 'The first argument to fadeout must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 364 | } |
| 365 | if ( !$amount instanceof Less_Tree_Dimension ) { |
| 366 | throw new Less_Exception_Compiler( 'The second argument to fadeout must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 367 | } |
| 368 | |
| 369 | $hsl = $color->toHSL(); |
| 370 | $hsl['a'] -= $amount->value / 100; |
| 371 | $hsl['a'] = self::clamp( $hsl['a'] ); |
| 372 | return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] ); |
| 373 | } |
| 374 | |
| 375 | public function fade( $color = null, $amount = null ) { |
| 376 | if ( !$color instanceof Less_Tree_Color ) { |
| 377 | throw new Less_Exception_Compiler( 'The first argument to fade must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 378 | } |
| 379 | if ( !$amount instanceof Less_Tree_Dimension ) { |
| 380 | throw new Less_Exception_Compiler( 'The second argument to fade must be a percentage' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 381 | } |
| 382 | |
| 383 | $hsl = $color->toHSL(); |
| 384 | |
| 385 | $hsl['a'] = $amount->value / 100; |
| 386 | $hsl['a'] = self::clamp( $hsl['a'] ); |
| 387 | return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] ); |
| 388 | } |
| 389 | |
| 390 | public function spin( $color = null, $amount = null ) { |
| 391 | if ( !$color instanceof Less_Tree_Color ) { |
| 392 | throw new Less_Exception_Compiler( 'The first argument to spin must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 393 | } |
| 394 | if ( !$amount instanceof Less_Tree_Dimension ) { |
| 395 | throw new Less_Exception_Compiler( 'The second argument to spin must be a number' . ( $amount instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 396 | } |
| 397 | |
| 398 | $hsl = $color->toHSL(); |
| 399 | $hue = fmod( $hsl['h'] + $amount->value, 360 ); |
| 400 | |
| 401 | $hsl['h'] = $hue < 0 ? 360 + $hue : $hue; |
| 402 | |
| 403 | return $this->hsla( $hsl['h'], $hsl['s'], $hsl['l'], $hsl['a'] ); |
| 404 | } |
| 405 | |
| 406 | // |
| 407 | // Copyright (c) 2006-2009 Hampton Catlin, Nathan Weizenbaum, and Chris Eppstein |
| 408 | // https://sass-lang.com/ |
| 409 | // |
| 410 | |
| 411 | /** |
| 412 | * @param Less_Tree|null $color1 |
| 413 | * @param Less_Tree|null $color2 |
| 414 | * @param Less_Tree|null $weight |
| 415 | */ |
| 416 | public function mix( $color1 = null, $color2 = null, $weight = null ) { |
| 417 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 418 | throw new Less_Exception_Compiler( 'The first argument to mix must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 419 | } |
| 420 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 421 | throw new Less_Exception_Compiler( 'The second argument to mix must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 422 | } |
| 423 | if ( !$weight ) { |
| 424 | $weight = new Less_Tree_Dimension( '50', '%' ); |
| 425 | } |
| 426 | if ( !$weight instanceof Less_Tree_Dimension ) { |
| 427 | throw new Less_Exception_Compiler( 'The third argument to contrast must be a percentage' . ( $weight instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 428 | } |
| 429 | |
| 430 | $p = $weight->value / 100.0; |
| 431 | $w = $p * 2 - 1; |
| 432 | $hsl1 = $color1->toHSL(); |
| 433 | $hsl2 = $color2->toHSL(); |
| 434 | $a = $hsl1['a'] - $hsl2['a']; |
| 435 | |
| 436 | $w1 = ( ( ( ( $w * $a ) == -1 ) ? $w : ( $w + $a ) / ( 1 + $w * $a ) ) + 1 ) / 2; |
| 437 | $w2 = 1 - $w1; |
| 438 | |
| 439 | $rgb = [ |
| 440 | $color1->rgb[0] * $w1 + $color2->rgb[0] * $w2, |
| 441 | $color1->rgb[1] * $w1 + $color2->rgb[1] * $w2, |
| 442 | $color1->rgb[2] * $w1 + $color2->rgb[2] * $w2 |
| 443 | ]; |
| 444 | |
| 445 | $alpha = $color1->alpha * $p + $color2->alpha * ( 1 - $p ); |
| 446 | |
| 447 | return new Less_Tree_Color( $rgb, $alpha ); |
| 448 | } |
| 449 | |
| 450 | public function greyscale( $color ) { |
| 451 | return $this->desaturate( $color, new Less_Tree_Dimension( 100, '%' ) ); |
| 452 | } |
| 453 | |
| 454 | public function contrast( $color, $dark = null, $light = null, $threshold = null ) { |
| 455 | // filter: contrast(3.2); |
| 456 | // should be kept as is, so check for color |
| 457 | if ( !$color instanceof Less_Tree_Color ) { |
| 458 | return null; |
| 459 | } |
| 460 | if ( !$light ) { |
| 461 | $light = $this->rgba( 255, 255, 255, 1.0 ); |
| 462 | } |
| 463 | if ( !$dark ) { |
| 464 | $dark = $this->rgba( 0, 0, 0, 1.0 ); |
| 465 | } |
| 466 | |
| 467 | if ( !$dark instanceof Less_Tree_Color ) { |
| 468 | throw new Less_Exception_Compiler( 'The second argument to contrast must be a color' . ( $dark instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 469 | } |
| 470 | if ( !$light instanceof Less_Tree_Color ) { |
| 471 | throw new Less_Exception_Compiler( 'The third argument to contrast must be a color' . ( $light instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 472 | } |
| 473 | |
| 474 | // Figure out which is actually light and dark! |
| 475 | if ( $dark->luma() > $light->luma() ) { |
| 476 | $t = $light; |
| 477 | $light = $dark; |
| 478 | $dark = $t; |
| 479 | } |
| 480 | if ( !$threshold ) { |
| 481 | $threshold = 0.43; |
| 482 | } else { |
| 483 | $threshold = self::number( $threshold ); |
| 484 | } |
| 485 | |
| 486 | if ( $color->luma() < $threshold ) { |
| 487 | return $light; |
| 488 | } else { |
| 489 | return $dark; |
| 490 | } |
| 491 | } |
| 492 | |
| 493 | public function e( $str ) { |
| 494 | if ( is_string( $str ) ) { |
| 495 | return new Less_Tree_Anonymous( $str ); |
| 496 | } |
| 497 | return new Less_Tree_Anonymous( $str instanceof Less_Tree_JavaScript ? $str->expression : $str->value ); |
| 498 | } |
| 499 | |
| 500 | public function escape( $str ) { |
| 501 | $revert = [ '%21' => '!', '%2A' => '*', '%27' => "'",'%3F' => '?','%26' => '&','%2C' => ',','%2F' => '/','%40' => '@','%2B' => '+','%24' => '$' ]; |
| 502 | |
| 503 | return new Less_Tree_Anonymous( strtr( rawurlencode( $str->value ), $revert ) ); |
| 504 | } |
| 505 | |
| 506 | /** |
| 507 | * todo: This function will need some additional work to make it work the same as less.js |
| 508 | * |
| 509 | */ |
| 510 | public function replace( $string, $pattern, $replacement, $flags = null ) { |
| 511 | $result = $string->value; |
| 512 | |
| 513 | $expr = '/' . str_replace( '/', '\\/', $pattern->value ) . '/'; |
| 514 | if ( $flags && $flags->value ) { |
| 515 | $expr .= self::replace_flags( $flags->value ); |
| 516 | } |
| 517 | |
| 518 | $result = preg_replace( $expr, $replacement->value, $result ); |
| 519 | |
| 520 | if ( property_exists( $string, 'quote' ) ) { |
| 521 | return new Less_Tree_Quoted( $string->quote, $result, $string->escaped ); |
| 522 | } |
| 523 | return new Less_Tree_Quoted( '', $result ); |
| 524 | } |
| 525 | |
| 526 | public static function replace_flags( $flags ) { |
| 527 | return str_replace( [ 'e', 'g' ], '', $flags ); |
| 528 | } |
| 529 | |
| 530 | public function _percent( $string, ...$args ) { |
| 531 | $result = $string->value; |
| 532 | |
| 533 | foreach ( $args as $arg ) { |
| 534 | if ( preg_match( '/%[sda]/i', $result, $token ) ) { |
| 535 | $token = $token[0]; |
| 536 | $value = stristr( $token, 's' ) ? $arg->value : $arg->toCSS(); |
| 537 | $value = preg_match( '/[A-Z]$/', $token ) ? urlencode( $value ) : $value; |
| 538 | $result = preg_replace( '/%[sda]/i', $value, $result, 1 ); |
| 539 | } |
| 540 | } |
| 541 | $result = str_replace( '%%', '%', $result ); |
| 542 | |
| 543 | return new Less_Tree_Quoted( $string->quote, $result, $string->escaped ); |
| 544 | } |
| 545 | |
| 546 | public function unit( $val, $unit = null ) { |
| 547 | if ( !( $val instanceof Less_Tree_Dimension ) ) { |
| 548 | throw new Less_Exception_Compiler( 'The first argument to unit must be a number' . ( $val instanceof Less_Tree_Operation ? '. Have you forgotten parenthesis?' : '.' ) ); |
| 549 | } |
| 550 | |
| 551 | if ( $unit ) { |
| 552 | if ( $unit instanceof Less_Tree_Keyword ) { |
| 553 | $unit = $unit->value; |
| 554 | } else { |
| 555 | $unit = $unit->toCSS(); |
| 556 | } |
| 557 | } else { |
| 558 | $unit = ""; |
| 559 | } |
| 560 | return new Less_Tree_Dimension( $val->value, $unit ); |
| 561 | } |
| 562 | |
| 563 | public function convert( $val, $unit ) { |
| 564 | return $val->convertTo( $unit->value ); |
| 565 | } |
| 566 | |
| 567 | public function round( $n, $f = false ) { |
| 568 | $fraction = 0; |
| 569 | if ( $f !== false ) { |
| 570 | $fraction = $f->value; |
| 571 | } |
| 572 | |
| 573 | return $this->_math( 'Less_Parser::round', null, $n, $fraction ); |
| 574 | } |
| 575 | |
| 576 | public function pi() { |
| 577 | return new Less_Tree_Dimension( M_PI ); |
| 578 | } |
| 579 | |
| 580 | public function mod( $a, $b ) { |
| 581 | return new Less_Tree_Dimension( $a->value % $b->value, $a->unit ); |
| 582 | } |
| 583 | |
| 584 | public function pow( $x, $y ) { |
| 585 | if ( is_numeric( $x ) && is_numeric( $y ) ) { |
| 586 | $x = new Less_Tree_Dimension( $x ); |
| 587 | $y = new Less_Tree_Dimension( $y ); |
| 588 | } elseif ( !( $x instanceof Less_Tree_Dimension ) || !( $y instanceof Less_Tree_Dimension ) ) { |
| 589 | throw new Less_Exception_Compiler( 'Arguments must be numbers' ); |
| 590 | } |
| 591 | |
| 592 | return new Less_Tree_Dimension( pow( $x->value, $y->value ), $x->unit ); |
| 593 | } |
| 594 | |
| 595 | // var mathFunctions = [{name:"ce ... |
| 596 | public function ceil( $n ) { |
| 597 | return $this->_math( 'ceil', null, $n ); |
| 598 | } |
| 599 | |
| 600 | public function floor( $n ) { |
| 601 | return $this->_math( 'floor', null, $n ); |
| 602 | } |
| 603 | |
| 604 | public function sqrt( $n ) { |
| 605 | return $this->_math( 'sqrt', null, $n ); |
| 606 | } |
| 607 | |
| 608 | public function abs( $n ) { |
| 609 | return $this->_math( 'abs', null, $n ); |
| 610 | } |
| 611 | |
| 612 | public function tan( $n ) { |
| 613 | return $this->_math( 'tan', '', $n ); |
| 614 | } |
| 615 | |
| 616 | public function sin( $n ) { |
| 617 | return $this->_math( 'sin', '', $n ); |
| 618 | } |
| 619 | |
| 620 | public function cos( $n ) { |
| 621 | return $this->_math( 'cos', '', $n ); |
| 622 | } |
| 623 | |
| 624 | public function atan( $n ) { |
| 625 | return $this->_math( 'atan', 'rad', $n ); |
| 626 | } |
| 627 | |
| 628 | public function asin( $n ) { |
| 629 | return $this->_math( 'asin', 'rad', $n ); |
| 630 | } |
| 631 | |
| 632 | public function acos( $n ) { |
| 633 | return $this->_math( 'acos', 'rad', $n ); |
| 634 | } |
| 635 | |
| 636 | private function _math( $fn, $unit, ...$args ) { |
| 637 | if ( $args[0] instanceof Less_Tree_Dimension ) { |
| 638 | if ( $unit === null ) { |
| 639 | $unit = $args[0]->unit; |
| 640 | } else { |
| 641 | $args[0] = $args[0]->unify(); |
| 642 | } |
| 643 | $args[0] = (float)$args[0]->value; |
| 644 | return new Less_Tree_Dimension( $fn( ...$args ), $unit ); |
| 645 | } elseif ( is_numeric( $args[0] ) ) { |
| 646 | return $fn( ...$args ); |
| 647 | } else { |
| 648 | throw new Less_Exception_Compiler( "math functions take numbers as parameters" ); |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | /** |
| 653 | * @param bool $isMin |
| 654 | * @param array<Less_Tree> $args |
| 655 | */ |
| 656 | private function _minmax( $isMin, $args ) { |
| 657 | $arg_count = count( $args ); |
| 658 | |
| 659 | if ( $arg_count < 1 ) { |
| 660 | throw new Less_Exception_Compiler( 'one or more arguments required' ); |
| 661 | } |
| 662 | |
| 663 | $j = null; |
| 664 | $unitClone = null; |
| 665 | $unitStatic = null; |
| 666 | |
| 667 | // elems only contains original argument values. |
| 668 | $order = []; |
| 669 | // key is the unit.toString() for unified tree.Dimension values, |
| 670 | // value is the index into the order array. |
| 671 | $values = []; |
| 672 | |
| 673 | for ( $i = 0; $i < $arg_count; $i++ ) { |
| 674 | $current = $args[$i]; |
| 675 | if ( !( $current instanceof Less_Tree_Dimension ) ) { |
| 676 | if ( $args[$i] instanceof Less_Tree_HasValueProperty && is_array( $args[$i]->value ) ) { |
| 677 | $args[] = $args[$i]->value; |
| 678 | } |
| 679 | continue; |
| 680 | } |
| 681 | // PhanTypeInvalidDimOffset -- False positive, safe after continue or non-first iterations |
| 682 | '@phan-var non-empty-list<Less_Tree_Dimension> $order'; |
| 683 | |
| 684 | if ( $current->unit->toString() === '' && !$unitClone ) { |
| 685 | $temp = new Less_Tree_Dimension( $current->value, $unitClone ); |
| 686 | $currentUnified = $temp->unify(); |
| 687 | } else { |
| 688 | $currentUnified = $current->unify(); |
| 689 | } |
| 690 | |
| 691 | if ( $currentUnified->unit->toString() === "" && !$unitStatic ) { |
| 692 | $unit = $unitStatic; |
| 693 | } else { |
| 694 | $unit = $currentUnified->unit->toString(); |
| 695 | } |
| 696 | |
| 697 | if ( $unit !== '' && !$unitStatic || $unit !== '' && $order[0]->unify()->unit->toString() === "" ) { |
| 698 | $unitStatic = $unit; |
| 699 | } |
| 700 | |
| 701 | if ( $unit != '' && !$unitClone ) { |
| 702 | $unitClone = $current->unit->toString(); |
| 703 | } |
| 704 | |
| 705 | if ( isset( $values[''] ) && $unit !== '' && $unit === $unitStatic ) { |
| 706 | $j = $values['']; |
| 707 | } elseif ( isset( $values[$unit] ) ) { |
| 708 | $j = $values[$unit]; |
| 709 | } else { |
| 710 | |
| 711 | if ( $unitStatic && $unit !== $unitStatic ) { |
| 712 | throw new Less_Exception_Compiler( 'incompatible types' ); |
| 713 | } |
| 714 | $values[$unit] = count( $order ); |
| 715 | $order[] = $current; |
| 716 | continue; |
| 717 | } |
| 718 | |
| 719 | if ( $order[$j]->unit->toString() === "" && $unitClone ) { |
| 720 | $temp = new Less_Tree_Dimension( $order[$j]->value, $unitClone ); |
| 721 | $referenceUnified = $temp->unify(); |
| 722 | } else { |
| 723 | $referenceUnified = $order[$j]->unify(); |
| 724 | } |
| 725 | if ( ( $isMin && $currentUnified->value < $referenceUnified->value ) || ( !$isMin && $currentUnified->value > $referenceUnified->value ) ) { |
| 726 | $order[$j] = $current; |
| 727 | } |
| 728 | } |
| 729 | |
| 730 | if ( count( $order ) == 1 ) { |
| 731 | return $order[0]; |
| 732 | } |
| 733 | $args = []; |
| 734 | foreach ( $order as $a ) { |
| 735 | $args[] = $a->toCSS(); |
| 736 | } |
| 737 | return new Less_Tree_Anonymous( ( $isMin ? 'min(' : 'max(' ) . implode( Less_Environment::$_outputMap[','], $args ) . ')' ); |
| 738 | } |
| 739 | |
| 740 | public function min( ...$args ) { |
| 741 | return $this->_minmax( true, $args ); |
| 742 | } |
| 743 | |
| 744 | public function max( ...$args ) { |
| 745 | return $this->_minmax( false, $args ); |
| 746 | } |
| 747 | |
| 748 | public function getunit( $n ) { |
| 749 | return new Less_Tree_Anonymous( $n->unit ); |
| 750 | } |
| 751 | |
| 752 | public function argb( $color ) { |
| 753 | if ( !$color instanceof Less_Tree_Color ) { |
| 754 | throw new Less_Exception_Compiler( 'The first argument to argb must be a color' . ( $color instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 755 | } |
| 756 | |
| 757 | return new Less_Tree_Anonymous( $color->toARGB() ); |
| 758 | } |
| 759 | |
| 760 | public function percentage( $n ) { |
| 761 | return new Less_Tree_Dimension( $n->value * 100, '%' ); |
| 762 | } |
| 763 | |
| 764 | public function color( $n ) { |
| 765 | if ( $n instanceof Less_Tree_Quoted ) { |
| 766 | $colorCandidate = $n->value; |
| 767 | $returnColor = Less_Tree_Color::fromKeyword( $colorCandidate ); |
| 768 | if ( $returnColor ) { |
| 769 | return $returnColor; |
| 770 | } |
| 771 | if ( preg_match( '/^#([A-Fa-f0-9]{6}|[A-Fa-f0-9]{3})/', $colorCandidate ) ) { |
| 772 | return new Less_Tree_Color( substr( $colorCandidate, 1 ) ); |
| 773 | } |
| 774 | throw new Less_Exception_Compiler( "argument must be a color keyword or 3/6 digit hex e.g. #FFF" ); |
| 775 | } else { |
| 776 | throw new Less_Exception_Compiler( "argument must be a string" ); |
| 777 | } |
| 778 | } |
| 779 | |
| 780 | public function iscolor( $n ) { |
| 781 | return $this->_isa( $n, 'Less_Tree_Color' ); |
| 782 | } |
| 783 | |
| 784 | public function isnumber( $n ) { |
| 785 | return $this->_isa( $n, 'Less_Tree_Dimension' ); |
| 786 | } |
| 787 | |
| 788 | public function isstring( $n ) { |
| 789 | return $this->_isa( $n, 'Less_Tree_Quoted' ); |
| 790 | } |
| 791 | |
| 792 | public function iskeyword( $n ) { |
| 793 | return $this->_isa( $n, 'Less_Tree_Keyword' ); |
| 794 | } |
| 795 | |
| 796 | public function isurl( $n ) { |
| 797 | return $this->_isa( $n, 'Less_Tree_Url' ); |
| 798 | } |
| 799 | |
| 800 | public function ispixel( $n ) { |
| 801 | return $this->isunit( $n, 'px' ); |
| 802 | } |
| 803 | |
| 804 | public function ispercentage( $n ) { |
| 805 | return $this->isunit( $n, '%' ); |
| 806 | } |
| 807 | |
| 808 | public function isem( $n ) { |
| 809 | return $this->isunit( $n, 'em' ); |
| 810 | } |
| 811 | |
| 812 | /** |
| 813 | * @param Less_Tree $n |
| 814 | * @param Less_Tree|string $unit |
| 815 | */ |
| 816 | public function isunit( $n, $unit ) { |
| 817 | if ( $unit instanceof Less_Tree_HasValueProperty ) { |
| 818 | $unit = $unit->value; |
| 819 | } |
| 820 | |
| 821 | return ( $n instanceof Less_Tree_Dimension ) && $n->unit->is( $unit ) ? new Less_Tree_Keyword( 'true' ) : new Less_Tree_Keyword( 'false' ); |
| 822 | } |
| 823 | |
| 824 | /** |
| 825 | * @param Less_Tree $n |
| 826 | * @param string $type |
| 827 | */ |
| 828 | private function _isa( $n, $type ) { |
| 829 | return is_a( $n, $type ) ? new Less_Tree_Keyword( 'true' ) : new Less_Tree_Keyword( 'false' ); |
| 830 | } |
| 831 | |
| 832 | public function tint( $color, $amount = null ) { |
| 833 | return $this->mix( $this->rgb( 255, 255, 255 ), $color, $amount ); |
| 834 | } |
| 835 | |
| 836 | public function shade( $color, $amount = null ) { |
| 837 | return $this->mix( $this->rgb( 0, 0, 0 ), $color, $amount ); |
| 838 | } |
| 839 | |
| 840 | public function extract( $values, $index ) { |
| 841 | $index = (int)$index->value - 1; // (1-based index) |
| 842 | // handle non-array values as an array of length 1 |
| 843 | // return 'undefined' if index is invalid |
| 844 | if ( $values instanceof Less_Tree_HasValueProperty && is_array( $values->value ) ) { |
| 845 | if ( isset( $values->value[$index] ) ) { |
| 846 | return $values->value[$index]; |
| 847 | } |
| 848 | return null; |
| 849 | |
| 850 | } elseif ( (int)$index === 0 ) { |
| 851 | return $values; |
| 852 | } |
| 853 | |
| 854 | return null; |
| 855 | } |
| 856 | |
| 857 | public function length( $values ) { |
| 858 | $n = ( $values instanceof Less_Tree_HasValueProperty && is_array( $values->value ) ) ? |
| 859 | count( $values->value ) : 1; |
| 860 | return new Less_Tree_Dimension( $n ); |
| 861 | } |
| 862 | |
| 863 | public function datauri( $mimetypeNode, $filePathNode = null ) { |
| 864 | $filePath = ( $filePathNode ? $filePathNode->value : null ); |
| 865 | $mimetype = $mimetypeNode->value; |
| 866 | |
| 867 | $args = 2; |
| 868 | if ( !$filePath ) { |
| 869 | $filePath = $mimetype; |
| 870 | $args = 1; |
| 871 | } |
| 872 | |
| 873 | $filePath = str_replace( '\\', '/', $filePath ); |
| 874 | if ( Less_Environment::isPathRelative( $filePath ) ) { |
| 875 | $currentFileInfo = $this->currentFileInfo; |
| 876 | '@phan-var array $currentFileInfo'; |
| 877 | if ( Less_Parser::$options['relativeUrls'] ) { |
| 878 | $temp = $currentFileInfo['currentDirectory']; |
| 879 | } else { |
| 880 | $temp = $currentFileInfo['entryPath']; |
| 881 | } |
| 882 | |
| 883 | if ( !empty( $temp ) ) { |
| 884 | $filePath = Less_Environment::normalizePath( rtrim( $temp, '/' ) . '/' . $filePath ); |
| 885 | } |
| 886 | |
| 887 | } |
| 888 | |
| 889 | // detect the mimetype if not given |
| 890 | if ( $args < 2 ) { |
| 891 | |
| 892 | /* incomplete |
| 893 | $mime = require('mime'); |
| 894 | mimetype = mime.lookup(path); |
| 895 | |
| 896 | // use base 64 unless it's an ASCII or UTF-8 format |
| 897 | var charset = mime.charsets.lookup(mimetype); |
| 898 | useBase64 = ['US-ASCII', 'UTF-8'].indexOf(charset) < 0; |
| 899 | if (useBase64) mimetype += ';base64'; |
| 900 | */ |
| 901 | |
| 902 | $mimetype = Less_Mime::lookup( $filePath ); |
| 903 | |
| 904 | $charset = Less_Mime::charsets_lookup( $mimetype ); |
| 905 | $useBase64 = !in_array( $charset, [ 'US-ASCII', 'UTF-8' ] ); |
| 906 | if ( $useBase64 ) { |
| 907 | $mimetype .= ';base64'; |
| 908 | } |
| 909 | |
| 910 | } else { |
| 911 | $useBase64 = preg_match( '/;base64$/', $mimetype ); |
| 912 | } |
| 913 | |
| 914 | if ( file_exists( $filePath ) ) { |
| 915 | $buf = @file_get_contents( $filePath ); |
| 916 | } else { |
| 917 | $buf = false; |
| 918 | } |
| 919 | |
| 920 | // IE8 cannot handle a data-uri larger than 32KB. If this is exceeded |
| 921 | // and the --ieCompat flag is enabled, return a normal url() instead. |
| 922 | $DATA_URI_MAX_KB = 32; |
| 923 | $fileSizeInKB = round( strlen( $buf ) / 1024 ); |
| 924 | if ( $fileSizeInKB >= $DATA_URI_MAX_KB ) { |
| 925 | $url = new Less_Tree_Url( ( $filePathNode ?: $mimetypeNode ), $this->currentFileInfo ); |
| 926 | return $url->compile( $this->env ); |
| 927 | } |
| 928 | |
| 929 | if ( $buf ) { |
| 930 | $buf = $useBase64 ? base64_encode( $buf ) : rawurlencode( $buf ); |
| 931 | $filePath = '"data:' . $mimetype . ',' . $buf . '"'; |
| 932 | } |
| 933 | |
| 934 | return new Less_Tree_Url( new Less_Tree_Anonymous( $filePath ) ); |
| 935 | } |
| 936 | |
| 937 | // svg-gradient |
| 938 | public function svggradient( $direction, ...$stops ) { |
| 939 | $throw_message = 'svg-gradient expects direction, start_color [start_position], [color position,]..., end_color [end_position]'; |
| 940 | |
| 941 | if ( count( $stops ) < 2 ) { |
| 942 | throw new Less_Exception_Compiler( $throw_message ); |
| 943 | } |
| 944 | |
| 945 | $gradientType = 'linear'; |
| 946 | $rectangleDimension = 'x="0" y="0" width="1" height="1"'; |
| 947 | $useBase64 = true; |
| 948 | $directionValue = $direction->toCSS(); |
| 949 | |
| 950 | switch ( $directionValue ) { |
| 951 | case "to bottom": |
| 952 | $gradientDirectionSvg = 'x1="0%" y1="0%" x2="0%" y2="100%"'; |
| 953 | break; |
| 954 | case "to right": |
| 955 | $gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="0%"'; |
| 956 | break; |
| 957 | case "to bottom right": |
| 958 | $gradientDirectionSvg = 'x1="0%" y1="0%" x2="100%" y2="100%"'; |
| 959 | break; |
| 960 | case "to top right": |
| 961 | $gradientDirectionSvg = 'x1="0%" y1="100%" x2="100%" y2="0%"'; |
| 962 | break; |
| 963 | case "ellipse": |
| 964 | case "ellipse at center": |
| 965 | $gradientType = "radial"; |
| 966 | $gradientDirectionSvg = 'cx="50%" cy="50%" r="75%"'; |
| 967 | $rectangleDimension = 'x="-50" y="-50" width="101" height="101"'; |
| 968 | break; |
| 969 | default: |
| 970 | throw new Less_Exception_Compiler( "svg-gradient direction must be 'to bottom', 'to right', 'to bottom right', 'to top right' or 'ellipse at center'" ); |
| 971 | } |
| 972 | |
| 973 | $returner = '<?xml version="1.0" ?>' . |
| 974 | '<svg xmlns="http://www.w3.org/2000/svg" version="1.1" width="100%" height="100%" viewBox="0 0 1 1" preserveAspectRatio="none">' . |
| 975 | '<' . $gradientType . 'Gradient id="gradient" gradientUnits="userSpaceOnUse" ' . $gradientDirectionSvg . '>'; |
| 976 | |
| 977 | for ( $i = 0; $i < count( $stops ); $i++ ) { |
| 978 | if ( $stops[$i] instanceof Less_Tree_HasValueProperty ) { |
| 979 | $color = $stops[$i]->value[0]; |
| 980 | $position = $stops[$i]->value[1]; |
| 981 | } else { |
| 982 | $color = $stops[$i]; |
| 983 | $position = null; |
| 984 | } |
| 985 | |
| 986 | if ( !( $color instanceof Less_Tree_Color ) || ( !( ( $i === 0 || $i + 1 === count( $stops ) ) && $position === null ) && !( $position instanceof Less_Tree_Dimension ) ) ) { |
| 987 | throw new Less_Exception_Compiler( $throw_message ); |
| 988 | } |
| 989 | if ( $position ) { |
| 990 | $positionValue = $position->toCSS(); |
| 991 | } elseif ( $i === 0 ) { |
| 992 | $positionValue = '0%'; |
| 993 | } else { |
| 994 | $positionValue = '100%'; |
| 995 | } |
| 996 | $alpha = $color->alpha; |
| 997 | $returner .= '<stop offset="' . $positionValue . '" stop-color="' . $color->toRGB() . '"' . ( $alpha < 1 ? ' stop-opacity="' . $alpha . '"' : '' ) . '/>'; |
| 998 | } |
| 999 | |
| 1000 | $returner .= '</' . $gradientType . 'Gradient><rect ' . $rectangleDimension . ' fill="url(#gradient)" /></svg>'; |
| 1001 | |
| 1002 | if ( $useBase64 ) { |
| 1003 | $returner = "'data:image/svg+xml;base64," . base64_encode( $returner ) . "'"; |
| 1004 | } else { |
| 1005 | $returner = "'data:image/svg+xml," . $returner . "'"; |
| 1006 | } |
| 1007 | |
| 1008 | return new Less_Tree_Url( new Less_Tree_Anonymous( $returner ) ); |
| 1009 | } |
| 1010 | |
| 1011 | /** |
| 1012 | * Php version of javascript's `encodeURIComponent` function |
| 1013 | * |
| 1014 | * @param string $string The string to encode |
| 1015 | * @return string The encoded string |
| 1016 | */ |
| 1017 | public static function encodeURIComponent( $string ) { |
| 1018 | $revert = [ '%21' => '!', '%2A' => '*', '%27' => "'", '%28' => '(', '%29' => ')' ]; |
| 1019 | return strtr( rawurlencode( $string ), $revert ); |
| 1020 | } |
| 1021 | |
| 1022 | // Color Blending |
| 1023 | // ref: https://www.w3.org/TR/compositing-1/ |
| 1024 | public function colorBlend( $mode, $color1, $color2 ) { |
| 1025 | // backdrop |
| 1026 | $ab = $color1->alpha; |
| 1027 | // source |
| 1028 | $as = $color2->alpha; |
| 1029 | $result = []; |
| 1030 | |
| 1031 | $ar = $as + $ab * ( 1 - $as ); |
| 1032 | for ( $i = 0; $i < 3; $i++ ) { |
| 1033 | $cb = $color1->rgb[$i] / 255; |
| 1034 | $cs = $color2->rgb[$i] / 255; |
| 1035 | $cr = $mode( $cb, $cs ); |
| 1036 | if ( $ar ) { |
| 1037 | $cr = ( $as * $cs + $ab * ( $cb - $as * ( $cb + $cs - $cr ) ) ) / $ar; |
| 1038 | } |
| 1039 | $result[$i] = $cr * 255; |
| 1040 | } |
| 1041 | |
| 1042 | return new Less_Tree_Color( $result, $ar ); |
| 1043 | } |
| 1044 | |
| 1045 | public function multiply( $color1 = null, $color2 = null ) { |
| 1046 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1047 | throw new Less_Exception_Compiler( 'The first argument to multiply must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1048 | } |
| 1049 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1050 | throw new Less_Exception_Compiler( 'The second argument to multiply must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1051 | } |
| 1052 | |
| 1053 | return $this->colorBlend( [ $this,'colorBlendMultiply' ], $color1, $color2 ); |
| 1054 | } |
| 1055 | |
| 1056 | private function colorBlendMultiply( $cb, $cs ) { |
| 1057 | return $cb * $cs; |
| 1058 | } |
| 1059 | |
| 1060 | public function screen( $color1 = null, $color2 = null ) { |
| 1061 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1062 | throw new Less_Exception_Compiler( 'The first argument to screen must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1063 | } |
| 1064 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1065 | throw new Less_Exception_Compiler( 'The second argument to screen must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1066 | } |
| 1067 | |
| 1068 | return $this->colorBlend( [ $this,'colorBlendScreen' ], $color1, $color2 ); |
| 1069 | } |
| 1070 | |
| 1071 | private function colorBlendScreen( $cb, $cs ) { |
| 1072 | return $cb + $cs - $cb * $cs; |
| 1073 | } |
| 1074 | |
| 1075 | public function overlay( $color1 = null, $color2 = null ) { |
| 1076 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1077 | throw new Less_Exception_Compiler( 'The first argument to overlay must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1078 | } |
| 1079 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1080 | throw new Less_Exception_Compiler( 'The second argument to overlay must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1081 | } |
| 1082 | |
| 1083 | return $this->colorBlend( [ $this,'colorBlendOverlay' ], $color1, $color2 ); |
| 1084 | } |
| 1085 | |
| 1086 | private function colorBlendOverlay( $cb, $cs ) { |
| 1087 | $cb *= 2; |
| 1088 | return ( $cb <= 1 ) |
| 1089 | ? $this->colorBlendMultiply( $cb, $cs ) |
| 1090 | : $this->colorBlendScreen( $cb - 1, $cs ); |
| 1091 | } |
| 1092 | |
| 1093 | public function softlight( $color1 = null, $color2 = null ) { |
| 1094 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1095 | throw new Less_Exception_Compiler( 'The first argument to softlight must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1096 | } |
| 1097 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1098 | throw new Less_Exception_Compiler( 'The second argument to softlight must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1099 | } |
| 1100 | |
| 1101 | return $this->colorBlend( [ $this,'colorBlendSoftlight' ], $color1, $color2 ); |
| 1102 | } |
| 1103 | |
| 1104 | private function colorBlendSoftlight( $cb, $cs ) { |
| 1105 | $d = 1; |
| 1106 | $e = $cb; |
| 1107 | if ( $cs > 0.5 ) { |
| 1108 | $e = 1; |
| 1109 | $d = ( $cb > 0.25 ) ? sqrt( $cb ) |
| 1110 | : ( ( 16 * $cb - 12 ) * $cb + 4 ) * $cb; |
| 1111 | } |
| 1112 | return $cb - ( 1 - 2 * $cs ) * $e * ( $d - $cb ); |
| 1113 | } |
| 1114 | |
| 1115 | public function hardlight( $color1 = null, $color2 = null ) { |
| 1116 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1117 | throw new Less_Exception_Compiler( 'The first argument to hardlight must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1118 | } |
| 1119 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1120 | throw new Less_Exception_Compiler( 'The second argument to hardlight must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1121 | } |
| 1122 | |
| 1123 | return $this->colorBlend( [ $this,'colorBlendHardlight' ], $color1, $color2 ); |
| 1124 | } |
| 1125 | |
| 1126 | private function colorBlendHardlight( $cb, $cs ) { |
| 1127 | return $this->colorBlendOverlay( $cs, $cb ); |
| 1128 | } |
| 1129 | |
| 1130 | public function difference( $color1 = null, $color2 = null ) { |
| 1131 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1132 | throw new Less_Exception_Compiler( 'The first argument to difference must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1133 | } |
| 1134 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1135 | throw new Less_Exception_Compiler( 'The second argument to difference must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1136 | } |
| 1137 | |
| 1138 | return $this->colorBlend( [ $this,'colorBlendDifference' ], $color1, $color2 ); |
| 1139 | } |
| 1140 | |
| 1141 | private function colorBlendDifference( $cb, $cs ) { |
| 1142 | return abs( $cb - $cs ); |
| 1143 | } |
| 1144 | |
| 1145 | public function exclusion( $color1 = null, $color2 = null ) { |
| 1146 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1147 | throw new Less_Exception_Compiler( 'The first argument to exclusion must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1148 | } |
| 1149 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1150 | throw new Less_Exception_Compiler( 'The second argument to exclusion must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1151 | } |
| 1152 | |
| 1153 | return $this->colorBlend( [ $this,'colorBlendExclusion' ], $color1, $color2 ); |
| 1154 | } |
| 1155 | |
| 1156 | private function colorBlendExclusion( $cb, $cs ) { |
| 1157 | return $cb + $cs - 2 * $cb * $cs; |
| 1158 | } |
| 1159 | |
| 1160 | public function average( $color1 = null, $color2 = null ) { |
| 1161 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1162 | throw new Less_Exception_Compiler( 'The first argument to average must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1163 | } |
| 1164 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1165 | throw new Less_Exception_Compiler( 'The second argument to average must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1166 | } |
| 1167 | |
| 1168 | return $this->colorBlend( [ $this,'colorBlendAverage' ], $color1, $color2 ); |
| 1169 | } |
| 1170 | |
| 1171 | // non-w3c functions: |
| 1172 | public function colorBlendAverage( $cb, $cs ) { |
| 1173 | return ( $cb + $cs ) / 2; |
| 1174 | } |
| 1175 | |
| 1176 | public function negation( $color1 = null, $color2 = null ) { |
| 1177 | if ( !$color1 instanceof Less_Tree_Color ) { |
| 1178 | throw new Less_Exception_Compiler( 'The first argument to negation must be a color' . ( $color1 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1179 | } |
| 1180 | if ( !$color2 instanceof Less_Tree_Color ) { |
| 1181 | throw new Less_Exception_Compiler( 'The second argument to negation must be a color' . ( $color2 instanceof Less_Tree_Expression ? ' (did you forgot commas?)' : '' ) ); |
| 1182 | } |
| 1183 | |
| 1184 | return $this->colorBlend( [ $this,'colorBlendNegation' ], $color1, $color2 ); |
| 1185 | } |
| 1186 | |
| 1187 | public function colorBlendNegation( $cb, $cs ) { |
| 1188 | return 1 - abs( $cb + $cs - 1 ); |
| 1189 | } |
| 1190 | |
| 1191 | // ~ End of Color Blending |
| 1192 | |
| 1193 | } |