style.cls.php

国外很不错的一个开源OA系统Group-Office

<?php
/**
 * DOMPDF - PHP5 HTML to PDF renderer
 *
 * File: $RCSfile: style.cls.php,v $
 * Created on: 2004-06-01
 *
 * Copyright (c) 2004 - Benj Carson <[e-mail]>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this library in the file LICENSE.LGPL; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
 * 02111-1307 USA
 *
 * Alternatively, you may distribute this software under the terms of the
 * PHP License, version 3.0 or later.  A copy of this license should have
 * been distributed with this file in the file LICENSE.PHP .  If this is not
 * the case, you can obtain a copy at http://www.php.net/license/3_0.txt.
 *
 * The latest version of DOMPDF might be available at:
 * http://www.digitaljunkies.ca/dompdf
 *
 * @link http://www.digitaljunkies.ca/dompdf
 * @copyright 2004 Benj Carson
 * @author Benj Carson <[e-mail]>
 * @package dompdf
 * @version 0.5.1
 */

/* $Id: style.cls.php,v 1.2 2006/07/21 10:46:20 mschering Exp $ */

/**
 * Represents CSS properties.
 *
 * The Style class is responsible for handling and storing CSS properties.
 * It includes methods to resolve colours and lengths, as well as getters &
 * setters for many CSS properites.
 *
 * Actual CSS parsing is performed in the {@link Stylesheet} class.
 *
 * @package dompdf
 */
class Style {

  /**
   * Default font size, in points.
   *
   * @var float
   */
  static $default_font_size = 12;

  /**
   * Default line height, as a fraction of the font size.
   *
   * @var float
   */
  static $default_line_height = 1.2;

  /**
   * List of all inline types.  Should really be a constant.
   *
   * @var array
   */
  static $INLINE_TYPES = array("inline");

  /**
   * List of all block types.  Should really be a constant.
   *
   * @var array
   */
  static $BLOCK_TYPES = array("block","inline-block", "table-cell", "list-item");

  /**
   * List of all table types.  Should really be a constant.
   *
   * @var array;
   */
  static $TABLE_TYPES = array("table", "inline-table");

  /**
   * List of valid border styles.  Should also really be a constant.
   *
   * @var array
   */
  static $BORDER_STYLES = array("none", "hidden", "dotted", "dashed", "solid",
                                "double", "groove", "ridge", "inset", "outset");

  /**
   * Default style values.
   *
   * @link http://www.w3.org/TR/CSS21/propidx.html
   *
   * @var array
   */
  static protected $_defaults = null;

  /**
   * List of inherited properties
   *
   * @link http://www.w3.org/TR/CSS21/propidx.html
   *
   * @var array
   */
  static protected $_inherited = null;

  /**
   * The stylesheet this style belongs to
   *
   * @see Stylesheet
   * @var Stylesheet
   */
  protected $_stylesheet; // stylesheet this style is attached to

  /**
   * Main array of all CSS properties & values
   *
   * @var array
   */
  protected $_props;

  /**
   * Cached property values
   *
   * @var array
   */
  protected $_prop_cache;
  
  /**
   * Font size of parent element in document tree.  Used for relative font
   * size resolution.
   *
   * @var float
   */
  protected $_parent_font_size; // Font size of parent element
  
  // private members
  /**
   * True once the font size is resolved absolutely
   *
   * @var bool
   */
  private $__font_size_calculated; // Cache flag
  
  /**
   * Class constructor
   *
   * @param Stylesheet $stylesheet the stylesheet this Style is associated with.
   */
  function __construct(Stylesheet $stylesheet) {
    $this->_props = array();
    $this->_stylesheet = $stylesheet;
    $this->_parent_font_size = null;
    $this->__font_size_calculated = false;
    
    if ( !isset(self::$_defaults) ) {
    
      // Shorthand
      $d =& self::$_defaults;
    
      // All CSS 2.1 properties, and their default values
      $d["azimuth"] = "center";
      $d["background_attachment"] = "scroll";
      $d["background_color"] = "transparent";
      $d["background_image"] = "none";
      $d["background_position"] = "0% 0%";
      $d["background_repeat"] = "repeat";
      $d["background"] = "";
      $d["border_collapse"] = "separate";
      $d["border_color"] = "";
      $d["border_spacing"] = "0";
      $d["border_style"] = "";
      $d["border_top"] = "";
      $d["border_right"] = "";
      $d["border_bottom"] = "";
      $d["border_left"] = "";
      $d["border_top_color"] = "";
      $d["border_right_color"] = "";
      $d["border_bottom_color"] = "";
      $d["border_left_color"] = "";
      $d["border_top_style"] = "none";
      $d["border_right_style"] = "none";
      $d["border_bottom_style"] = "none";
      $d["border_left_style"] = "none";
      $d["border_top_width"] = "medium";
      $d["border_right_width"] = "medium";
      $d["border_bottom_width"] = "medium";
      $d["border_left_width"] = "medium";
      $d["border_width"] = "medium";
      $d["border"] = "";
      $d["bottom"] = "auto";
      $d["caption_side"] = "top";
      $d["clear"] = "none";
      $d["clip"] = "auto";
      $d["color"] = "#000000";
      $d["content"] = "normal";
      $d["counter_increment"] = "none";
      $d["counter_reset"] = "none";
      $d["cue_after"] = "none";
      $d["cue_before"] = "none";
      $d["cue"] = "";
      $d["cursor"] = "auto";
      $d["direction"] = "ltr";
      $d["display"] = "inline";
      $d["elevation"] = "level";
      $d["empty_cells"] = "show";
      $d["float"] = "none";
      $d["font_family"] = "serif";
      $d["font_size"] = "medium";
      $d["font_style"] = "normal";
      $d["font_variant"] = "normal";
      $d["font_weight"] = "normal";
      $d["font"] = "";
      $d["height"] = "auto";
      $d["left"] = "auto";
      $d["letter_spacing"] = "normal";
      $d["line_height"] = "normal";
      $d["list_style_image"] = "none";
      $d["list_style_position"] = "outside";
      $d["list_style_type"] = "disc";
      $d["list_style"] = "";
      $d["margin_right"] = "0";
      $d["margin_left"] = "0";
      $d["margin_top"] = "0";
      $d["margin_bottom"] = "0";
      $d["margin"] = "";
      $d["max_height"] = "none";
      $d["max_width"] = "none";
      $d["min_height"] = "0";
      $d["min_width"] = "0";
      $d["orphans"] = "2";
      $d["outline_color"] = "invert";
      $d["outline_style"] = "none";
      $d["outline_width"] = "medium";
      $d["outline"] = "";
      $d["overflow"] = "visible";
      $d["padding_top"] = "0";
      $d["padding_right"] = "0";
      $d["padding_bottom"] = "0";
      $d["padding_left"] = "0";
      $d["padding"] = "";
      $d["page_break_after"] = "auto";
      $d["page_break_before"] = "auto";
      $d["page_break_inside"] = "auto";
      $d["pause_after"] = "0";
      $d["pause_before"] = "0";
      $d["pause"] = "";
      $d["pitch_range"] = "50";
      $d["pitch"] = "medium";
      $d["play_during"] = "auto";
      $d["position"] = "static";
      $d["quotes"] = "";
      $d["richness"] = "50";
      $d["right"] = "auto";
      $d["speak_header"] = "once";
      $d["speak_numeral"] = "continuous";
      $d["speak_punctuation"] = "none";
      $d["speak"] = "normal";
      $d["speech_rate"] = "medium";
      $d["stress"] = "50";
      $d["table_layout"] = "auto";
      $d["text_align"] = "left";
      $d["text_decoration"] = "none";
      $d["text_indent"] = "0";
      $d["text_transform"] = "none";
      $d["top"] = "auto";
      $d["unicode_bidi"] = "normal";
      $d["vertical_align"] = "baseline";
      $d["visibility"] = "visible";
      $d["voice_family"] = "";
      $d["volume"] = "medium";
      $d["white_space"] = "normal";
      $d["widows"] = "2";
      $d["width"] = "auto";
      $d["word_spacing"] = "normal";
      $d["z_index"] = "auto";

      // Properties that inherit by default
      self::$_inherited = array("azimuth",
                                 "border_collapse",
                                 "border_spacing",
                                 "caption_side",
                                 "color",
                                 "cursor",
                                 "direction",
                                 "elevation",
                                 "empty_cells",
                                 "font_family",
                                 "font_size",
                                 "font_style",
                                 "font_variant",
                                 "font_weight",
                                 "font",
                                 "letter_spacing",
                                 "line_height",
                                 "list_style_image",
                                 "list_style_position",
                                 "list_style_type",
                                 "list_style",
                                 "orphans",
                                 "page_break_inside",
                                 "pitch_range",
                                 "pitch",
                                 "quotes",
                                 "richness",
                                 "speak_header",
                                 "speak_numeral",
                                 "speak_punctuation",
                                 "speak",
                                 "speech_rate",
                                 "stress",
                                 "text_align",
                                 "text_indent",
                                 "text_transform",
                                 "visibility",
                                 "voice_family",
                                 "volume",
                                 "white_space",
                                 "widows",
                                 "word_spacing");
    }

  }

  /**
   * "Destructor": forcibly free all references held by this object
   */
  function dispose() {
    unset($this->_stylesheet);
  }
  
  /**
   * returns the {@link Stylesheet} this Style is associated with.
   *
   * @return Stylesheet
   */
  function get_stylesheet() { return $this->_stylesheet; }
  
  /**
   * Converts any CSS length value into an absolute length in points.
   *
   * length_in_pt() takes a single length (e.g. '1em') or an array of
   * lengths and returns an absolute length.  If an array is passed, then
   * the return value is the sum of all elements.
   *
   * If a reference size is not provided, the default font size is used
   * ({@link Style::$default_font_size}).
   *
   * @param float|array $length   the length or array of lengths to resolve
   * @param float       $ref_size  an absolute reference size to resolve percentage lengths
   * @return float
   */
  function length_in_pt($length, $ref_size = null) {

    if ( !is_array($length) )
      $length = array($length);

    if ( !isset($ref_size) )
      $ref_size = self::$default_font_size;

    $ret = 0;
    foreach ($length as $l) {

      if ( $l === "auto" ) 
        return "auto";
      
      if ( $l === "none" )
        return "none";

      // Assume numeric values are already in points
      if ( is_numeric($l) ) {
        $ret += $l;
        continue;
      }
        
      if ( $l === "normal" ) {
        $ret += $ref_size;
        continue;
      }

      // Border lengths
      if ( $l === "thin" ) {
        $ret += 0.5;
        continue;
      }
      
      if ( $l === "medium" ) {
        $ret += 1.5;
        continue;
      }
    
      if ( $l === "thick" ) {
        $ret += 2.5;
        continue;
      }
      
      if ( ($i = mb_strpos($l, "pt"))  !== false ) {
        $ret += mb_substr($l, 0, $i);
        continue;
      }

      if ( ($i = mb_strpos($l, "px"))  !== false ) {
        $ret += mb_substr($l, 0, $i);
        continue;
      }

      if ( ($i = mb_strpos($l, "em"))  !== false ) {
        $ret += mb_substr($l, 0, $i) * $this->__get("font_size");
        continue;
      }
      
      // FIXME: em:ex ratio?
      if ( ($i = mb_strpos($l, "ex"))  !== false ) {
        $ret += mb_substr($l, 0, $i) * $this->__get("font_size");
        continue;
      }
      
      if ( ($i = mb_strpos($l, "%"))  !== false ) {
        $ret += mb_substr($l, 0, $i)/100 * $ref_size;
        continue;
      }
      
      if ( ($i = mb_strpos($l, "in")) !== false ) {
        $ret += mb_substr($l, 0, $i) * 72;
        continue;
      }
          
      if ( ($i = mb_strpos($l, "cm")) !== false ) {
        $ret += mb_substr($l, 0, $i) * 72 / 2.54;
        continue;
      }

      if ( ($i = mb_strpos($l, "mm")) !== false ) {
        $ret += mb_substr($l, 0, $i) * 72 / 25.4;
        continue;
      }
          
      if ( ($i = mb_strpos($l, "pc")) !== false ) {
        $ret += mb_substr($l, 0, $i) / 12;
        continue;
      }
          
      // Bogus value
      $ret += $ref_size;
    }

    return $ret;
  }

  
  /**
   * Set inherited properties in this style using values in $parent
   *
   * @param Style $parent
   */
  function inherit(Style $parent) {

    // Set parent font size
    $this->_parent_font_size = $parent->get_font_size();
    
    foreach (self::$_inherited as $prop) {
      if ( !isset($this->_props[$prop]) && isset($parent->_props[$prop]) ) 
        $this->_props[$prop] = $parent->_props[$prop];
    }
      
    foreach (array_keys($this->_props) as $prop) {
      if ( $this->_props[$prop] == "inherit" )
        $this->$prop = $parent->$prop;
    }
          
    return $this;
  }

  
  /**
   * Override properties in this style with those in $style
   *
   * @param Style $style
   */
  function merge(Style $style) {
    $this->_props = array_merge($this->_props, $style->_props);

    if ( isset($style->_props["font_size"]) )
      $this->__font_size_calculated = false;    
  }

  
  /**
   * Returns an array(r, g, b, "r"=> r, "g"=>g, "b"=>b, "hex"=>"#rrggbb")
   * based on the provided CSS colour value.
   *
   * @param string $colour
   * @return array
   */
  function munge_colour($colour) {
    if ( is_array($colour) )
      // Assume the array has the right format...
      // FIXME: should/could verify this.
      return $colour;
    
    $r = 0;
    $g = 0;
    $b = 0;

    // Handle colour names
    switch ($colour) {

    case "maroon":
      $r = 0x80;
      break;

    case "red":
      $r = 0xff;
      break;

    case "orange":
      $r = 0xff;
      $g = 0xa5;
      break;

    case "yellow":
      $r = 0xff;
      $g = 0xff;
      break;

    case "olive":
      $r = 0x80;
      $g = 0x80;
      break;

    case "purple":
      $r = 0x80;