libprogress.php
author Dan
Sun, 14 Dec 2008 00:51:06 -0500
changeset 35 a76ae7eaa2eb
parent 22 04c2f743c6ec
permissions -rw-r--r--
Updated news page
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<?php
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/**
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 * Class for drawing progress bars in a vt100 console.
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 * @author Dan Fuhry
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 * @license Public domain
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 */
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class ProgressBar
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{
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  /**
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   * Shell escape character.
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   * @const string
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   */
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  const SHELL_ESCAPE = "\x1B";
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  /**
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   * Carriage return (0x0D)
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   * @const string
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   */
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  const CARRIAGE_RETURN = "\r";
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  /**
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   * Colors of the foreground, background, foreground text, and background text, respectively
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   * @var int
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   * @var int
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   * @var int
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   * @var int
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   */
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  private $color_bar, $color_empty, $color_text, $color_emptytext;
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  /**
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   * Text to the left of the bar.
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   * @var string
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   */
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  private $bar_left;
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  /**
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   * Text to the right of the bar.
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   * @var string
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   */
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  private $bar_right;
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  /**
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   * Text in the middle of the bar.
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   * @var string
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   */
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  private $bar_text;
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  /**
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   * The current location of the bar in %.
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   * @var int
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   */
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  private $bar_pos = 0;
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  /**
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   * Position where the text should start.
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   * @var int
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   */
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  private $text_pos = 0;
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  /**
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   * Width of the current terminal.
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   * @var int
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   */
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  private $term_width = 80;
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  /**
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   * Width of the actual bar.
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   * @var int
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   */
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  private $bar_width = 0;
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  /**
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   * State of the bar's color. Used to avoid echoing tons of color codes.
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   * @var int
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   */
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  private $color_state = 0;
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  /**
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   * Color state constants
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   * @const int
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   * @const int
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   * @const int
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   * @const int
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   * @const int
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   */
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  const COLOR_STATE_RESET = 0;
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  const COLOR_STATE_FULL_HIDE = 1;
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  const COLOR_STATE_FULL_SHOW = 2;
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  const COLOR_STATE_EMPTY_HIDE = 3;
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  const COLOR_STATE_EMPTY_SHOW = 4;
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  /**
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   * Constructor. All parameters are optional. Color choices are defined in color_to_code.
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   * @param string $bar_left
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   * @param string $bar_right
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   * @param string $bar_text
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   * @param string $color_bar
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   * @param string $color_empty
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   * @param string $color_text
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   * @param string $color_emptytext
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   */
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  public function __construct($bar_left = '[', $bar_right = ']', $bar_text = '', $color_bar = 'red', $color_empty = 'black', $color_text = 'white', $color_emptytext = 'cyan')
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  {
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    $this->bar_left = $bar_left;
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    $this->bar_right = $bar_right;
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    $this->color_bar = $this->color_to_code($color_bar);
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    $this->color_empty = $this->color_to_code($color_empty);
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    $this->color_text = $this->color_to_code($color_text);
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    $this->color_emptytext = $this->color_to_code($color_emptytext);
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    if ( isset($_SERVER['COLUMNS']) )
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    {
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      $this->term_width = intval($_SERVER['COLUMNS']);
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    }
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    $this->bar_width = $this->term_width - strlen($this->bar_left) - strlen($this->bar_right);
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    $this->update_text_quiet($bar_text);
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  }
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  /**
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   * Updates the text on the progress bar and recalculates the position without redrawing.
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   * @param string Text in the bar. If omitted, blanked.
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   */
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  public function update_text_quiet($bar_text = '')
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  {
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    $this->bar_text = strval($bar_text);
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    if ( !empty($this->bar_text) )
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    {
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      $this->text_pos = round(( $this->bar_width / 2 ) - ( strlen($this->bar_text) / 2 ));
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    }
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  }
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  /**
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   * Updates the text on the progress bar, recalculates the position, and redraws.
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   * @param string Text in the bar. If omitted, blanked.
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   */
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  function update_text($bar_text = '')
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  {
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    $this->update_text_quiet($bar_text);
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    $this->set($this->bar_pos);
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  }
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  /**
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   * Starts output of the bar.
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   */
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  function start()
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  {
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    echo self::CARRIAGE_RETURN;
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    echo $this->bar_left;
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  }
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  /**
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   * Closes the bar.
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   */
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  function end()
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  {
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    $this->set($this->bar_pos, $this->bar_width);
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    echo "\n";
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  }
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  /**
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   * Sets the position of the bar.
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   * @param int Position in %. If a second parameter is set, this is treated as a numerator with the second parameter being the denominator and that is used to calculate position.
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   * @param int Optional. Total number of units to allow fraction usage instead of percentage.
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   */
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  function set($pos, $max = 100)
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  {
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    // if our pos is higher than 100%, reduce it
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    if ( $pos > $max )
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      $pos = $max;
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    // arithmetic one-liner
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    // this is where we should stop showing the "full" color and instead use "empty"
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    $bar_pos = round($this->bar_width * ( $pos / $max ));
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    $this->bar_pos = 100 * ( $pos / $max );
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    // reset the cursor
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    echo self::CARRIAGE_RETURN . $this->bar_left;
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    // print everything out
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    for ( $i = 0; $i < $this->bar_width; $i++ )
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    {
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      $char = ' ';
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      $hide = true;
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      if ( !empty($this->bar_text) )
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      {
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        // we have some text to display in the middle; see where we are.
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        $show_text = ( $i >= $this->text_pos && $i < ( $this->text_pos + strlen($this->bar_text) ) );
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        if ( $show_text )
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        {
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          $char = substr($this->bar_text, $i - $this->text_pos, 1);
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          if ( strlen($char) < 1 )
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            $char = ' ';
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          else
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            $hide = false;
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        }
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      }
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      // determine color
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      if ( $i > $bar_pos )
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      {
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        $hide ? $this->set_color_empty_hide() : $this->set_color_empty_show();
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      }
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      else
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      {
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        $hide ? $this->set_color_full_hide() : $this->set_color_full_show();
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      }
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      echo $char;
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    }
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    $this->set_color_reset();
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    echo $this->bar_right;
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  }
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  #
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  # PRIVATE METHODS
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  #
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  function set_color_full_hide()
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  {
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    if ( $this->color_state == self::COLOR_STATE_FULL_HIDE )
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      return;
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    $this->color_state = self::COLOR_STATE_FULL_HIDE;
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    $fgcolor = 30 + $this->color_bar;
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    $bgcolor = $fgcolor + 10;
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    echo self::SHELL_ESCAPE . "[0;{$fgcolor};{$bgcolor};8m";
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  }
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  function set_color_full_show()
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  {
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    if ( $this->color_state == self::COLOR_STATE_FULL_SHOW )
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      return;
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    $this->color_state = self::COLOR_STATE_FULL_SHOW;
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    $fgcolor = 30 + $this->color_text;
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    $bgcolor = 40 + $this->color_bar;
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    echo self::SHELL_ESCAPE . "[0;1;{$fgcolor};{$bgcolor}m";
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  }
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  function set_color_empty_hide()
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  {
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    if ( $this->color_state == self::COLOR_STATE_EMPTY_HIDE )
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      return;
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    $this->color_state = self::COLOR_STATE_EMPTY_HIDE;
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    $fgcolor = 30 + $this->color_empty;
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    $bgcolor = $fgcolor + 10;
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    echo self::SHELL_ESCAPE . "[0;{$fgcolor};{$bgcolor};8m";
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  }
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  function set_color_empty_show()
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  {
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    if ( $this->color_state == self::COLOR_STATE_EMPTY_SHOW )
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      return;
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    $this->color_state = self::COLOR_STATE_EMPTY_SHOW;
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    $fgcolor = 30 + $this->color_emptytext;
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    $bgcolor = 40 + $this->color_empty;
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    echo self::SHELL_ESCAPE . "[0;1;{$fgcolor};{$bgcolor}m";
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  }
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  function set_color_reset()
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  {
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    if ( $this->color_state == self::COLOR_STATE_RESET )
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      return;
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    $this->color_state = self::COLOR_STATE_RESET;
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    echo self::SHELL_ESCAPE . "[0m";
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  }
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  /**
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   * Converts a color name to an ASCII color code. Valid color names are black, red, green, yellow, blue, magenta, cyan, and white.
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   * @param string Color name
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   * @return int
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   */
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  private function color_to_code($color)
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  {
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    static $colors = array(
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      'black' => 0,
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      'red' => 1,
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      'green' => 2,
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      'yellow' => 3,
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      'blue' => 4,
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      'magenta' => 5,
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      'cyan' => 6,
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      'white' => 7
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    );
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    return ( isset($colors[$color]) ) ? $colors[$color] : $colors['white'];
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  }
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}