Html.php

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<?php

namespace Rsi\Fred;

class Html extends Component{

  public $escape = false;
  public $break = null;
  public $backgroundHeightMin = 0; //%
  public $backgroundHeightMax = 100; //%
  public $backgroundHeightStep = 10; //%
  public $backgroundWidthMin = 10; //%
  public $backgroundWidthMax = 90; //%
  public $backgroundWidthStep = 5; //%

  protected function options($content,$value,$assoc){
    if(is_array($options = $content)){
      if($assoc === null) $assoc = \Rsi\Record::assoc($options);
      $content = $this->break;
      foreach($options as $key => $descr){
        if(is_array($descr)) $content .= $this->optgroup($this->options($descr,$value,$assoc),['label' => $key]);
        else{
          $attribs = [];
          if($assoc) $attribs['value'] = $key;
          else $key = $descr;
          if(is_array($value) ? in_array($key,$value) : !strcmp($key,$value)) $attribs['selected'] = true;
          $content .= $this->_option($descr,$attribs);
        }
        $content .= $this->break;
      }
    }
    return $content;
  }

  public function tag($tag,$content = null,$attribs = null){
    if($content && $this->escape) $content = htmlspecialchars($content);
    $this->escape = false;
    $html = '<' . $tag;
    if($attribs) foreach($attribs as $key => $value) if(!\Rsi::nothing($value)){
      $html .= ' ' . $key;
      if($value !== true) $html .= '="' . htmlspecialchars(is_array($value) ? implode($value) : $value) . '"';
    }
    return $html . ($content === false ? '>' : ">$content</$tag>");
  }

  public function a($content,$attribs = null,$href = null){
    return $this->tag('a',$content,array_merge(['href' => $href],$attribs ?: []));
  }

  public function datalist($content,$attribs = null,$id = null){
    return $this->tag('datalist',$this->options($content,null,false),array_merge(['id' => $id],$attribs ?: []));
  }

  public function div($content,$attribs = null,$class = null,$id = null){
    return $this->tag('div',$content,array_merge(compact('class','id'),$attribs ?: []));
  }

  public function form($content,$attribs = null,$action = null,$method = 'post',$enctype = 'multipart/form-data'){
    return $this->tag('form',$content,array_merge(compact('action','method','enctype'),$attribs ?: []));
  }

  public function img($content,$attribs = null,$alt = null){
    $auto_width = \Rsi\Record::get($attribs,'width') === true;
    $auto_height = \Rsi\Record::get($attribs,'height') === true;
    $auto_background = \Rsi\Record::get($attribs,'background') === true;
    if($auto_width || $auto_height || $auto_background){
      $log = $this->_fred->component('log');
      if(strpos($filename = $content,'//') !== false) $filename = \Rsi\Http::ensureProtocol($filename);
      elseif(substr($filename,0,1) == '/') $filename = \Rsi\Http::docRoot() . $filename;
      else $filename = \Rsi\Http::docRoot() . dirname($_SERVER['REQUEST_URI'] ?? null) . '/' . $filename;
      $width = $height = null;
      if($auto_background){
        unset($attribs['background']);
        try{
          $image = imagecreatefromstring(file_get_contents($filename));
          $width = imagesx($image);
          $height = imagesy($image);
          $log->debug("Auto-background generation for '$filename' ($width x $height)",__FILE__,__LINE__);
          $background = 'background: linear-gradient(to bottom';
          for($y = $this->backgroundHeightMin; $y <= $this->backgroundHeightMax; $y += $this->backgroundHeightStep){
            $red = $green = $blue = $count = 0;
            for($x = $this->backgroundWidthMin; $x <= $this->backgroundWidthMax; $x += $this->backgroundWidthStep){
              $rgb = imagecolorsforindex($image,imagecolorat($image,min($x * $width / 100,$width - 1),min($y * $height / 100,$height - 1)));
              $red += $rgb['red'];
              $green += $rgb['green'];
              $blue += $rgb['blue'];
              $count++;
            }
            $background .= ',' . \Rsi\Color::toHex([$red / $count,$green / $count,$blue / $count]) . " $y%";
          }
          if(array_key_exists('style',$attribs)) $attribs['style'] .= ';' . $background;
          else $attribs['style'] = $background;
        }
        catch(\Exception $e){
          $log->info($e);
        }
      }
      if($auto_width || $auto_height) try{
        if($width === null) list($width,$height) = getimagesize($filename);
        if($auto_width) $attribs['width'] = $width;
        if($auto_height) $attribs['height'] = $height;
      }
      catch(\Exception $e){
        $log->info($e);
        if($auto_width) unset($attribs['width']);
        if($auto_height) unset($attribs['height']);
      }
    }
    return $this->tag('img',false,array_merge(['src' => $content,'alt' => $alt ?: \Rsi\File::basename($content),'title' => $alt],$attribs ?: []));
  }

  public function input($content,$attribs = null,$type = null,$name = null,$options = null){
    if($options){
      $escape = $this->escape;
      $html = '';
      foreach($options as $key => $label){
        if($escape) $label = htmlspecialchars($label);
        $radio = $type == 'radio';
        $html .= $this->label(
          $this->input(
            \Rsi::nothing($key) ? [''] : $key,
            array_merge($attribs ?: [],['checked' => is_array($content) ? in_array($key,$content) : !strcmp($key,$content)]),
            $type,
            $name . ($radio ? '' : "[$key]")
          ) .
          $label
        );
      }
      return $html;
    }
    return $this->tag('input',false,array_merge(['value' => $content] + compact('type','name'),$attribs ?: []));
  }

  public function meta($content,$attribs = null,$name){
    return $this->tag('meta',false,array_merge(['name' => $name,'content' => $content],$attribs ?: [])) . $this->break;
  }

  public function script($content,$attribs = null,$srcs = null,$type = 'text/javascript'){
    if($content) $content = "\n/* <![CDATA[ */\n$content\n/* ]]> */\n";
    if(!is_array($srcs)) $srcs = [$srcs];
    $html = '';
    foreach($srcs as $src) $html .= $this->tag('script',$content,array_merge(compact('src','type'),$attribs ?: [])) . $this->break;
    return $html;
  }

  public function select($content,$attribs = null,$value = null,$assoc = null,$name = null){
    return $this->tag('select',$this->options($content,$value,$assoc),array_merge(['name' => $name],$attribs ?: []));
  }

  public function span($content,$attribs = null,$class = null,$id = null){
    return $this->tag('span',$content,array_merge(compact('class','id'),$attribs ?: []));
  }

  public function style($content,$attribs = null,$srcs = null,$type = 'text/css'){
    if(!$srcs) return $this->tag('style',$content,$attribs);
    if(!is_array($srcs)) $srcs = [$srcs];
    $html = '';
    foreach($srcs as $src) $html .= $this->tag('link',false,array_merge(['rel' => 'stylesheet','type' => $type,'href' => $src],$attribs ?: [])) . $this->break;
    return $html;
  }

  public function textarea($content,$attribs = null,$name = null){
    return $this->tag('textarea',$content ?: null,array_merge(['name' => $name],$attribs ?: []));
  }

  public function th($content,$attribs = null,$scope = 'col'){
    return $this->tag('th',$content,array_merge(['scope' => $scope],$attribs ?: []));
  }

  public function __call($func_name,$params){
    if(substr($func_name,0,1) == '_'){
      $this->escape = true;
      $func_name = substr($func_name,1);
    }
    else{
      array_unshift($params,$func_name);
      $func_name = 'tag';
    }
    return call_user_func_array([$this,$func_name],$params);
  }

}