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   1  <?php
   2  
   3  namespace LesserPHP\Functions;
   4  
   5  use LesserPHP\Utils\Asserts;
   6  use LesserPHP\Utils\Color;
   7  use LesserPHP\Utils\Util;
   8  
   9  /**
  10   * Implements the type functions for LESS
  11   *
  12   * @link https://lesscss.org/functions/#type-functions
  13   */
  14  class Type extends AbstractFunctionCollection
  15  {
  16      /** @inheritdoc  */
  17      public function getFunctions(): array
  18      {
  19          return [
  20              'isnumber' => [$this, 'isnumber'],
  21              'isstring' => [$this, 'isstring'],
  22              'iscolor' => [$this, 'iscolor'],
  23              'iskeyword' => [$this, 'iskeyword'],
  24              'isurl' => [$this, 'isurl'],
  25              'ispixel' => [$this, 'ispixel'],
  26              'isem' => [$this, 'isem'],
  27              'isrem' => [$this, 'isrem'],
  28              'ispercentage' => [$this, 'ispercentage'],
  29              'isunit' => [$this, 'isunit'],
  30              //'isruleset' => [$this, 'isruleset'],
  31              //'isdefined' => [$this, 'isdefined'],
  32          ];
  33      }
  34  
  35  
  36      /**
  37       * Returns true if a value is a number, false otherwise
  38       *
  39       * @link https://lesscss.org/functions/#type-functions-isnumber
  40       */
  41      public function isnumber(array $value): array
  42      {
  43          return Util::toBool($value[0] == 'number');
  44      }
  45  
  46      /**
  47       * Returns true if a value is a string, false otherwise
  48       *
  49       * @link https://lesscss.org/functions/#type-functions-isstring
  50       */
  51      public function isstring(array $value): array
  52      {
  53          return Util::toBool($value[0] == 'string');
  54      }
  55  
  56      /**
  57       * Returns true if a value is a color, false otherwise
  58       *
  59       * @link https://lesscss.org/functions/#type-functions-iscolor
  60       */
  61      public function iscolor(array $value): array
  62      {
  63          return Util::toBool(Color::coerceColor($value));
  64      }
  65  
  66      /**
  67       * Returns true if a value is a keyword, false otherwise
  68       *
  69       * @link https://lesscss.org/functions/#type-functions-iskeyword
  70       */
  71      public function iskeyword(array $value): array
  72      {
  73          return Util::toBool($value[0] == 'keyword');
  74      }
  75  
  76      /**
  77       * Returns true if a value is a url, false otherwise
  78       *
  79       * @link https://lesscss.org/functions/#type-functions-isurl
  80       */
  81      public function isurl(array $value): array
  82      {
  83          return Util::toBool($value[0] == 'function' && $value[1] == 'url');
  84      }
  85  
  86      /**
  87       * Returns true if a value is a number in pixels, false otherwise
  88       *
  89       * @link https://lesscss.org/functions/#type-functions-ispixel
  90       */
  91      public function ispixel(array $value): array
  92      {
  93          return Util::toBool($value[0] == 'number' && $value[2] == 'px');
  94      }
  95  
  96      /**
  97       * Returns true if a value is an em value, false otherwise
  98       *
  99       * @link https://lesscss.org/functions/#type-functions-isem
 100       */
 101      public function isem(array $value): array
 102      {
 103          return Util::toBool($value[0] == 'number' && $value[2] == 'em');
 104      }
 105  
 106      /**
 107       * Returns true if a value is an rem value, false otherwise
 108       *
 109       * This method does not exist in the official less.js implementation
 110       */
 111      public function isrem(array $value): array
 112      {
 113          return Util::toBool($value[0] == 'number' && $value[2] == 'rem');
 114      }
 115  
 116      /**
 117       * Returns true if a value is a percentage, false otherwise
 118       *
 119       * @link https://lesscss.org/functions/#type-functions-ispercentage
 120       */
 121      public function ispercentage(array $value): array
 122      {
 123          return Util::toBool($value[0] == 'number' && $value[2] == '%');
 124      }
 125  
 126      /**
 127       * Returns true if a value is a number with a given unit, false otherwise
 128       *
 129       * @link https://lesscss.org/functions/#type-functions-isunit
 130       */
 131      public function isunit(array $args): array
 132      {
 133          [$input, $unit] = Asserts::assertArgs($args, 2, 'isunit');
 134          $unit = $this->lessc->compileValue($this->lessc->unwrap($unit));
 135  
 136          return Util::toBool(
 137              $input[0] == 'number' &&
 138              $input[2] == $unit
 139          );
 140      }
 141  
 142      // isruleset is missing
 143      // isdefined is missing
 144  }