SassColour::__construct PHP Méthode

    public function __construct($colour)
    {
        if (is_string($colour)) {
            $colour = strtolower($colour);
            if ($colour === self::TRANSPARENT) {
                $this->red = 0;
                $this->green = 0;
                $this->blue = 0;
                $this->alpha = 0;
            } else {
                if (array_key_exists($colour, self::$svgColours)) {
                    $colour = self::$svgColours[$colour];
                }
                if (preg_match(self::EXTRACT_3, $colour, $matches)) {
                    for ($i = 1; $i < 4; $i++) {
                        $matches[$i] = str_repeat($matches[$i], 2);
                    }
                } else {
                    preg_match(self::EXTRACT_6, $colour, $matches);
                }
                if (empty($matches)) {
                    throw new SassColourException('Invalid SassColour string', SassScriptParser::$context->node);
                }
                $this->red = intval($matches[1], 16);
                $this->green = intval($matches[2], 16);
                $this->blue = intval($matches[3], 16);
                $this->alpha = 1;
            }
        } elseif (is_array($colour)) {
            $scheme = $this->assertValid($colour);
            if ($scheme == 'rgb') {
                $this->red = $colour['red'];
                $this->green = $colour['green'];
                $this->blue = $colour['blue'];
                $this->alpha = isset($colour['alpha']) ? $colour['alpha'] : 1;
            } elseif ($scheme == 'hsl') {
                $this->hue = $colour['hue'];
                $this->saturation = $colour['saturation'];
                $this->lightness = $colour['lightness'];
                $this->alpha = isset($colour['alpha']) ? $colour['alpha'] : 1;
            } else {
                $this->red = $colour[0];
                $this->green = $colour[1];
                $this->blue = $colour[2];
                $this->alpha = isset($colour[3]) ? $colour[3] : 1;
            }
        } else {
            throw new SassColourException('Colour must be a array', SassScriptParser::$context->node);
        }
    }