1 | <?php |
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2 | /** |
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3 | * DOMPDF - PHP5 HTML to PDF renderer |
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4 | * |
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5 | * File: $RCSfile: stylesheet.cls.php,v $ |
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6 | * Created on: 2004-06-01 |
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7 | * |
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8 | * Copyright (c) 2004 - Benj Carson <benjcarson@digitaljunkies.ca> |
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9 | * |
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10 | * This library is free software; you can redistribute it and/or |
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11 | * modify it under the terms of the GNU Lesser General Public |
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12 | * License as published by the Free Software Foundation; either |
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13 | * version 2.1 of the License, or (at your option) any later version. |
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14 | * |
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15 | * This library is distributed in the hope that it will be useful, |
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16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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18 | * Lesser General Public License for more details. |
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19 | * |
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20 | * You should have received a copy of the GNU Lesser General Public License |
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21 | * along with this library in the file LICENSE.LGPL; if not, write to the |
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22 | * Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
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23 | * 02111-1307 USA |
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24 | * |
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25 | * Alternatively, you may distribute this software under the terms of the |
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26 | * PHP License, version 3.0 or later. A copy of this license should have |
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27 | * been distributed with this file in the file LICENSE.PHP . If this is not |
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28 | * the case, you can obtain a copy at http://www.php.net/license/3_0.txt. |
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29 | * |
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30 | * The latest version of DOMPDF might be available at: |
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31 | * http://www.digitaljunkies.ca/dompdf |
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32 | * |
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33 | * @link http://www.digitaljunkies.ca/dompdf |
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34 | * @copyright 2004 Benj Carson |
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35 | * @author Benj Carson <benjcarson@digitaljunkies.ca> |
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36 | * @package dompdf |
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37 | * @version 0.5.1 |
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38 | */ |
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39 | |
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40 | /* $Id: stylesheet.cls.php,v 1.16 2006/07/07 21:31:04 benjcarson Exp $ */ |
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41 | |
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42 | /** |
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43 | * The location of the default built-in CSS file. |
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44 | * {@link Stylesheet::DEFAULT_STYLESHEET} |
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45 | */ |
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46 | define('__DEFAULT_STYLESHEET', DOMPDF_LIB_DIR . DIRECTORY_SEPARATOR . "res" . DIRECTORY_SEPARATOR . "html.css"); |
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47 | |
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48 | /** |
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49 | * The master stylesheet class |
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50 | * |
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51 | * The Stylesheet class is responsible for parsing stylesheets and style |
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52 | * tags/attributes. It also acts as a registry of the individual Style |
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53 | * objects generated by the current set of loaded CSS files and style |
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54 | * elements. |
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55 | * |
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56 | * @see Style |
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57 | * @package dompdf |
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58 | */ |
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59 | class Stylesheet { |
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60 | |
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61 | |
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62 | |
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63 | /** |
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64 | * the location of the default built-in CSS file. |
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65 | * |
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66 | */ |
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67 | const DEFAULT_STYLESHEET = __DEFAULT_STYLESHEET; // Hack: can't |
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68 | // concatenate stuff in |
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69 | // const declarations, |
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70 | // but I can do this? |
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71 | // protected members |
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72 | |
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73 | /** |
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74 | * array of currently defined styles |
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75 | * @var array |
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76 | */ |
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77 | private $_styles; |
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78 | |
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79 | /** |
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80 | * base protocol of the document being parsed |
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81 | * |
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82 | * Used to handle relative urls. |
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83 | * |
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84 | * @var string |
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85 | */ |
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86 | private $_protocol; |
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87 | |
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88 | /** |
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89 | * base hostname of the document being parsed |
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90 | * |
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91 | * Used to handle relative urls. |
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92 | * @var string |
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93 | */ |
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94 | private $_base_host; |
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95 | |
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96 | /** |
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97 | * base path of the document being parsed |
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98 | * |
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99 | * Used to handle relative urls. |
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100 | * @var string |
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101 | */ |
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102 | private $_base_path; |
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103 | |
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104 | |
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105 | /** |
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106 | * the style defined by @page rules |
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107 | * |
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108 | * @var Style |
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109 | */ |
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110 | private $_page_style; |
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111 | |
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112 | |
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113 | /** |
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114 | * list of loaded files, used to prevent recursion |
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115 | * |
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116 | * @var array |
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117 | */ |
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118 | private $_loaded_files; |
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119 | |
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120 | /** |
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121 | * accepted CSS media types |
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122 | */ |
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123 | static $ACCEPTED_MEDIA_TYPES = array("all", "static", "visual", |
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124 | "bitmap", "paged", "print"); |
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125 | |
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126 | /** |
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127 | * The class constructor. |
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128 | * |
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129 | * The base protocol, host & path are initialized to those of |
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130 | * the current script. |
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131 | */ |
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132 | function __construct() { |
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133 | $this->_styles = array(); |
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134 | $this->_loaded_files = array(); |
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135 | list($this->_protocol, $this->_base_host, $this->_base_path) = explode_url($_SERVER["SCRIPT_FILENAME"]); |
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136 | $this->_page_style = null; |
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137 | } |
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138 | |
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139 | /** |
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140 | * Set the base protocol |
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141 | * |
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142 | * @param string $proto |
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143 | */ |
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144 | function set_protocol($proto) { $this->_protocol = $proto; } |
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145 | |
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146 | /** |
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147 | * Set the base host |
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148 | * |
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149 | * @param string $host |
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150 | */ |
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151 | function set_host($host) { $this->_base_host = $host; } |
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152 | |
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153 | /** |
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154 | * Set the base path |
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155 | * |
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156 | * @param string $path |
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157 | */ |
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158 | function set_base_path($path) { $this->_base_path = $path; } |
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159 | |
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160 | |
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161 | /** |
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162 | * Return the base protocol for this stylesheet |
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163 | * |
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164 | * @return string |
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165 | */ |
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166 | function get_protocol() { return $this->_protocol; } |
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167 | |
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168 | /** |
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169 | * Return the base host for this stylesheet |
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170 | * |
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171 | * @return string |
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172 | */ |
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173 | function get_host() { return $this->_base_host; } |
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174 | |
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175 | /** |
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176 | * Return the base path for this stylesheet |
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177 | * |
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178 | * @return string |
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179 | */ |
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180 | function get_base_path() { return $this->_base_path; } |
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181 | |
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182 | /** |
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183 | * add a new Style object to the stylesheet |
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184 | * |
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185 | * add_style() adds a new Style object to the current stylesheet, or |
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186 | * merges a new Style with an existing one. |
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187 | * |
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188 | * @param string $key the Style's selector |
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189 | * @param Style $style the Style to be added |
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190 | */ |
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191 | function add_style($key, Style $style) { |
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192 | if (!is_string($key)) |
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193 | throw new DOMPDF_Exception("CSS rule must be keyed by a string."); |
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194 | |
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195 | if ( isset($this->_styles[$key]) ) |
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196 | $this->_styles[$key]->merge($style); |
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197 | else |
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198 | $this->_styles[$key] = clone $style; |
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199 | } |
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200 | |
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201 | |
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202 | /** |
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203 | * lookup a specifc Style object |
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204 | * |
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205 | * lookup() returns the Style specified by $key, or null if the Style is |
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206 | * not found. |
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207 | * |
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208 | * @param string $key the selector of the requested Style |
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209 | * @return Style |
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210 | */ |
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211 | function lookup($key) { |
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212 | if ( !isset($this->_styles[$key]) ) |
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213 | return null; |
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214 | |
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215 | return $this->_styles[$key]; |
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216 | } |
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217 | |
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218 | /** |
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219 | * create a new Style object associated with this stylesheet |
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220 | * |
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221 | * @param Style $parent The style of this style's parent in the DOM tree |
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222 | * @return Style |
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223 | */ |
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224 | function create_style($parent = null) { |
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225 | return new Style($this, $parent); |
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226 | } |
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227 | |
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228 | |
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229 | /** |
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230 | * load and parse a CSS string |
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231 | * |
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232 | * @param string $css |
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233 | */ |
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234 | function load_css(&$css) { $this->_parse_css($css); } |
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235 | |
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236 | |
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237 | /** |
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238 | * load and parse a CSS file |
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239 | * |
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240 | * @param string $file |
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241 | */ |
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242 | function load_css_file($file) { |
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243 | global $_dompdf_warnings; |
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244 | |
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245 | // Prevent circular references |
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246 | if ( isset($this->_loaded_files[$file]) ) |
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247 | return; |
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248 | |
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249 | $this->_loaded_files[$file] = true; |
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250 | $parsed_url = explode_url($file); |
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251 | |
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252 | list($this->_protocol, $this->_base_host, $this->_base_path, $filename) = $parsed_url; |
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253 | |
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254 | if ( !DOMPDF_ENABLE_REMOTE && |
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255 | ($this->_protocol != "" && $this->_protocol != "file://") ) { |
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256 | record_warnings(E_USER_WARNING, "Remote CSS file '$file' requested, but DOMPDF_ENABLE_REMOTE is false.", __FILE__, __LINE__); |
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257 | return; |
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258 | } |
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259 | |
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260 | // Fix submitted by Nick Oostveen for aliased directory support: |
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261 | if ( $this->_protocol == "" ) |
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262 | $file = $this->_base_path . $filename; |
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263 | else |
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264 | $file = build_url($this->_protocol, $this->_base_host, $this->_base_path, $filename); |
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265 | |
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266 | set_error_handler("record_warnings"); |
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267 | $css = file_get_contents($file); |
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268 | restore_error_handler(); |
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269 | |
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270 | if ( $css == "" ) { |
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271 | record_warnings(E_USER_WARNING, "Unable to load css file $file", __FILE__, __LINE__);; |
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272 | return; |
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273 | } |
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274 | |
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275 | $this->_parse_css($css); |
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276 | |
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277 | } |
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278 | |
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279 | /** |
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280 | * @link http://www.w3.org/TR/CSS21/cascade.html#specificity} |
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281 | * |
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282 | * @param string $selector |
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283 | * @return int |
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284 | */ |
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285 | private function _specificity($selector) { |
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286 | // http://www.w3.org/TR/CSS21/cascade.html#specificity |
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287 | |
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288 | $a = ($selector === "!style attribute") ? 1 : 0; |
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289 | |
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290 | $b = min(mb_substr_count($selector, "#"), 255); |
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291 | |
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292 | $c = min(mb_substr_count($selector, ".") + |
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293 | mb_substr_count($selector, ">") + |
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294 | mb_substr_count($selector, "+"), 255); |
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295 | |
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296 | $d = min(mb_substr_count($selector, " "), 255); |
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297 | |
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298 | return ($a << 24) | ($b << 16) | ($c << 8) | ($d); |
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299 | } |
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300 | |
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301 | |
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302 | /** |
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303 | * converts a CSS selector to an XPath query. |
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304 | * |
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305 | * @param string $selector |
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306 | * @return string |
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307 | */ |
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308 | private function _css_selector_to_xpath($selector) { |
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309 | |
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310 | // Collapse white space and strip whitespace around delimiters |
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311 | // $search = array("/\\s+/", "/\\s+([.>#+:])\\s+/"); |
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312 | // $replace = array(" ", "\\1"); |
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313 | // $selector = preg_replace($search, $replace, trim($selector)); |
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314 | |
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315 | // Initial query (non-absolute) |
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316 | $query = "//"; |
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317 | |
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318 | // Parse the selector |
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319 | //$s = preg_split("/([ :>.#+])/", $selector, -1, PREG_SPLIT_DELIM_CAPTURE); |
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320 | |
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321 | $delimiters = array(" ", ">", ".", "#", "+", ":", "["); |
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322 | |
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323 | // Add an implicit space at the beginning of the selector if there is no |
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324 | // delimiter there already. |
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325 | if ( !in_array($selector{0}, $delimiters) ) |
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326 | $selector = " $selector"; |
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327 | |
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328 | $tok = ""; |
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329 | $len = mb_strlen($selector); |
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330 | $i = 0; |
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331 | |
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332 | while ( $i < $len ) { |
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333 | |
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334 | $s = $selector{$i}; |
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335 | $i++; |
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336 | |
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337 | // Eat characters up to the next delimiter |
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338 | $tok = ""; |
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339 | |
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340 | while ($i < $len) { |
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341 | if ( in_array($selector{$i}, $delimiters) ) |
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342 | break; |
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343 | $tok .= $selector{$i++}; |
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344 | } |
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345 | |
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346 | switch ($s) { |
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347 | |
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348 | case " ": |
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349 | case ">": |
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350 | // All elements matching the next token that are direct children of |
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351 | // the current token |
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352 | $expr = $s == " " ? "descendant" : "child"; |
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353 | |
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354 | if ( mb_substr($query, -1, 1) != "/" ) |
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355 | $query .= "/"; |
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356 | |
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357 | if ( !$tok ) |
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358 | $tok = "*"; |
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359 | |
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360 | $query .= "$expr::$tok"; |
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361 | $tok = ""; |
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362 | break; |
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363 | |
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364 | case ".": |
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365 | case "#": |
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366 | // All elements matching the current token with a class/id equal to |
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367 | // the _next_ token. |
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368 | |
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369 | $attr = $s == "." ? "class" : "id"; |
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370 | |
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371 | // empty class/id == * |
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372 | if ( mb_substr($query, -1, 1) == "/" ) |
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373 | $query .= "*"; |
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374 | |
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375 | // Match multiple classes: $tok contains the current selected |
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376 | // class. Search for class attributes with class="$tok", |
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377 | // class=".* $tok .*" and class=".* $tok" |
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378 | |
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379 | // This doesn't work because libxml only supports XPath 1.0... |
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380 | //$query .= "[matches(@$attr,\"^${tok}\$|^${tok}[ ]+|[ ]+${tok}\$|[ ]+${tok}[ ]+\")]"; |
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381 | |
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382 | // Query improvement by Michael Sheakoski <michael@mjsdigital.com>: |
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383 | $query .= "[contains(concat(' ', @$attr, ' '), concat(' ', '$tok', ' '))]"; |
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384 | $tok = ""; |
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385 | break; |
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386 | |
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387 | case "+": |
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388 | // All sibling elements that folow the current token |
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389 | if ( mb_substr($query, -1, 1) != "/" ) |
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390 | $query .= "/"; |
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391 | |
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392 | $query .= "following-sibling::$tok"; |
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393 | $tok = ""; |
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394 | break; |
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395 | |
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396 | case ":": |
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397 | // Pseudo-classes |
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398 | switch ($tok) { |
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399 | |
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400 | case "first-child": |
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401 | break; |
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402 | |
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403 | case "link": |
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404 | $query .= "[@href]"; |
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405 | $tok = ""; |
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406 | break; |
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407 | |
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408 | case "first-line": |
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409 | break; |
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410 | |
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411 | case "first-letter": |
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412 | break; |
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413 | |
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414 | case "before": |
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415 | break; |
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416 | |
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417 | case "after": |
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418 | break; |
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419 | |
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420 | } |
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421 | |
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422 | break; |
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423 | |
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424 | case "[": |
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425 | // Attribute selectors. All with an attribute matching the following token(s) |
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426 | $attr_delimiters = array("=", "]", "~", "|"); |
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427 | $tok_len = mb_strlen($tok); |
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428 | $j = 0; |
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429 | |
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430 | $attr = ""; |
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431 | $op = ""; |
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432 | $value = ""; |
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433 | |
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434 | while ( $j < $tok_len ) { |
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435 | if ( in_array($tok{$j}, $attr_delimiters) ) |
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436 | break; |
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437 | $attr .= $tok{$j++}; |
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438 | } |
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439 | |
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440 | switch ( $tok{$j} ) { |
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441 | |
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442 | case "~": |
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443 | case "|": |
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444 | $op .= $tok{$j++}; |
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445 | |
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446 | if ( $tok{$j} != "=" ) |
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447 | throw new DOMPDF_Exception("Invalid CSS selector syntax: invalid attribute selector: $selector"); |
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448 | |
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449 | $op .= $tok{$j}; |
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450 | break; |
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451 | |
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452 | case "=": |
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453 | $op = "="; |
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454 | break; |
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455 | |
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456 | } |
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457 | |
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458 | // Read the attribute value, if required |
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459 | if ( $op != "" ) { |
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460 | $j++; |
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461 | while ( $j < $tok_len ) { |
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462 | if ( $tok{$j} == "]" ) |
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463 | break; |
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464 | $value .= $tok{$j++}; |
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465 | } |
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466 | } |
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467 | |
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468 | if ( $attr == "" ) |
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469 | throw new DOMPDF_Exception("Invalid CSS selector syntax: missing attribute name"); |
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470 | |
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471 | switch ( $op ) { |
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472 | |
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473 | case "": |
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474 | $query .= "[@$attr]"; |
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475 | break; |
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476 | |
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477 | case "=": |
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478 | $query .= "[@$attr$op\"$value\"]"; |
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479 | break; |
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480 | |
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481 | case "~=": |
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482 | // FIXME: this will break if $value contains quoted strings |
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483 | // (e.g. [type~="a b c" "d e f"]) |
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484 | $values = explode(" ", $value); |
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485 | $query .= "["; |
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486 | |
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487 | foreach ( $values as $val ) |
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488 | $query .= "@$attr=\"$val\" or "; |
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489 | |
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490 | $query = rtrim($query, " or ") . "]"; |
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491 | break; |
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492 | |
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493 | case "|=": |
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494 | $values = explode("-", $value); |
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495 | $query .= "["; |
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496 | |
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497 | foreach ($values as $val) |
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498 | $query .= "starts-with(@$attr, \"$val\") or "; |
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499 | |
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500 | $query = rtrim($query, " or ") . "]"; |
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501 | break; |
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502 | |
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503 | } |
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504 | |
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505 | break; |
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506 | } |
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507 | } |
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508 | $i++; |
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509 | |
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510 | // case ":": |
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511 | // // Pseudo selectors: ignore for now. Partially handled directly |
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512 | // // below. |
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513 | |
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514 | // // Skip until the next special character, leaving the token as-is |
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515 | // while ( $i < $len ) { |
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516 | // if ( in_array($selector{$i}, $delimiters) ) |
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517 | // break; |
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518 | // $i++; |
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519 | // } |
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520 | // break; |
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521 | |
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522 | // default: |
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523 | // // Add the character to the token |
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524 | // $tok .= $selector{$i++}; |
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525 | // break; |
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526 | // } |
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527 | |
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528 | // } |
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529 | |
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530 | |
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531 | // Trim the trailing '/' from the query |
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532 | if ( mb_strlen($query) > 2 ) |
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533 | $query = rtrim($query, "/"); |
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534 | |
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535 | return $query; |
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536 | } |
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537 | |
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538 | /** |
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539 | * applies all current styles to a particular document tree |
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540 | * |
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541 | * apply_styles() applies all currently loaded styles to the provided |
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542 | * {@link Frame_Tree}. Aside from parsing CSS, this is the main purpose |
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543 | * of this class. |
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544 | * |
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545 | * @param Frame_Tree $tree |
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546 | */ |
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547 | function apply_styles(Frame_Tree $tree) { |
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548 | |
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549 | // Use XPath to select nodes. This would be easier if we could attach |
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550 | // Frame objects directly to DOMNodes using the setUserData() method, but |
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551 | // we can't do that just yet. Instead, we set a _node attribute_ in |
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552 | // Frame->set_id() and use that as a handle on the Frame object via |
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553 | // Frame_Tree::$_registry. |
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554 | |
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555 | // We create a scratch array of styles indexed by frame id. Once all |
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556 | // styles have been assigned, we order the cached styles by specificity |
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557 | // and create a final style object to assign to the frame. |
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558 | |
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559 | // FIXME: this is not particularly robust... |
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560 | |
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561 | $styles = array(); |
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562 | $xp = new DOMXPath($tree->get_dom()); |
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563 | |
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564 | // Apply all styles in stylesheet |
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565 | foreach ($this->_styles as $selector => $style) { |
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566 | |
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567 | $query = $this->_css_selector_to_xpath($selector); |
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568 | // pre_var_dump($selector); |
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569 | // pre_var_dump($query); |
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570 | // echo ($style); |
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571 | |
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572 | // Retrieve the nodes |
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573 | $nodes = $xp->query($query); |
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574 | |
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575 | foreach ($nodes as $node) { |
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576 | //echo $node->nodeName . "\n"; |
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577 | // Retrieve the node id |
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578 | if ( $node->nodeType != 1 ) // Only DOMElements get styles |
---|
579 | continue; |
---|
580 | |
---|
581 | $id = $node->getAttribute("frame_id"); |
---|
582 | |
---|
583 | // Assign the current style to the scratch array |
---|
584 | $spec = $this->_specificity($selector); |
---|
585 | $styles[$id][$spec][] = $style; |
---|
586 | } |
---|
587 | } |
---|
588 | |
---|
589 | // Now create the styles and assign them to the appropriate frames. (We |
---|
590 | // iterate over the tree using an implicit Frame_Tree iterator.) |
---|
591 | $root_flg = false; |
---|
592 | foreach ($tree->get_frames() as $frame) { |
---|
593 | // pre_r($frame->get_node()->nodeName . ":"); |
---|
594 | |
---|
595 | if ( !$root_flg && $this->_page_style ) { |
---|
596 | $style = $this->_page_style; |
---|
597 | $root_flg = true; |
---|
598 | |
---|
599 | } else |
---|
600 | $style = $this->create_style(); |
---|
601 | |
---|
602 | // Find nearest DOMElement parent |
---|
603 | $p = $frame; |
---|
604 | while ( $p = $p->get_parent() ) |
---|
605 | if ($p->get_node()->nodeType == 1 ) |
---|
606 | break; |
---|
607 | |
---|
608 | // Styles can only be applied directly to DOMElements; anonymous |
---|
609 | // frames inherit from their parent |
---|
610 | if ( $frame->get_node()->nodeType != 1 ) { |
---|
611 | if ( $p ) |
---|
612 | $style->inherit($p->get_style()); |
---|
613 | $frame->set_style($style); |
---|
614 | continue; |
---|
615 | } |
---|
616 | |
---|
617 | $id = $frame->get_id(); |
---|
618 | |
---|
619 | // Handle HTML 4.0 attributes |
---|
620 | Attribute_Translator::translate_attributes($frame); |
---|
621 | |
---|
622 | // Locate any additional style attributes |
---|
623 | if ( ($str = $frame->get_node()->getAttribute("style")) !== "" ) { |
---|
624 | $spec = $this->_specificity("!style attribute"); |
---|
625 | $styles[$id][$spec][] = $this->_parse_properties($str); |
---|
626 | } |
---|
627 | |
---|
628 | // Grab the applicable styles |
---|
629 | if ( isset($styles[$id]) ) { |
---|
630 | |
---|
631 | $applied_styles = $styles[ $frame->get_id() ]; |
---|
632 | |
---|
633 | // Sort by specificity |
---|
634 | ksort($applied_styles); |
---|
635 | |
---|
636 | // Merge the new styles with the inherited styles |
---|
637 | foreach ($applied_styles as $arr) { |
---|
638 | foreach ($arr as $s) |
---|
639 | $style->merge($s); |
---|
640 | } |
---|
641 | } |
---|
642 | |
---|
643 | // Inherit parent's styles if required |
---|
644 | if ( $p ) { |
---|
645 | $style->inherit( $p->get_style() ); |
---|
646 | } |
---|
647 | |
---|
648 | // pre_r($frame->get_node()->nodeName . ":"); |
---|
649 | // echo "<pre>"; |
---|
650 | // echo $style; |
---|
651 | // echo "</pre>"; |
---|
652 | $frame->set_style($style); |
---|
653 | |
---|
654 | } |
---|
655 | |
---|
656 | // We're done! Clean out the registry of all styles since we |
---|
657 | // won't be needing this later. |
---|
658 | foreach ( array_keys($this->_styles) as $key ) { |
---|
659 | unset($this->_styles[$key]); |
---|
660 | } |
---|
661 | |
---|
662 | } |
---|
663 | |
---|
664 | |
---|
665 | /** |
---|
666 | * parse a CSS string using a regex parser |
---|
667 | * |
---|
668 | * Called by {@link Stylesheet::parse_css()} |
---|
669 | * |
---|
670 | * @param string $str |
---|
671 | */ |
---|
672 | private function _parse_css($str) { |
---|
673 | |
---|
674 | // Destroy comments |
---|
675 | $css = preg_replace("'/\*.*?\*/'si", "", $str); |
---|
676 | |
---|
677 | // FIXME: handle '{' within strings, e.g. [attr="string {}"] |
---|
678 | |
---|
679 | // Something more legible: |
---|
680 | $re = |
---|
681 | "/\s* # Skip leading whitespace \n". |
---|
682 | "( @([^\s]+)\s+([^{;]*) (?:;|({)) )? # Match @rules followed by ';' or '{' \n". |
---|
683 | "(?(1) # Only parse sub-sections if we're in an @rule... \n". |
---|
684 | " (?(4) # ...and if there was a leading '{' \n". |
---|
685 | " \s*( (?:(?>[^{}]+) ({)? # Parse rulesets and individual @page rules \n". |
---|
686 | " (?(6) (?>[^}]*) }) \s*)+? \n". |
---|
687 | " ) \n". |
---|
688 | " }) # Balancing '}' \n". |
---|
689 | "| # Branch to match regular rules (not preceeded by '@')\n". |
---|
690 | "([^{]*{[^}]*})) # Parse normal rulesets\n". |
---|
691 | "/xs"; |
---|
692 | |
---|
693 | if ( preg_match_all($re, $css, $matches, PREG_SET_ORDER) === false ) |
---|
694 | // An error occured |
---|
695 | throw new DOMPDF_Exception("Error parsing css file: preg_match_all() failed."); |
---|
696 | |
---|
697 | // After matching, the array indicies are set as follows: |
---|
698 | // |
---|
699 | // [0] => complete text of match |
---|
700 | // [1] => contains '@import ...;' or '@media {' if applicable |
---|
701 | // [2] => text following @ for cases where [1] is set |
---|
702 | // [3] => media types or full text following '@import ...;' |
---|
703 | // [4] => '{', if present |
---|
704 | // [5] => rulesets within media rules |
---|
705 | // [6] => '{', within media rules |
---|
706 | // [7] => individual rules, outside of media rules |
---|
707 | // |
---|
708 | //pre_r($matches); |
---|
709 | foreach ( $matches as $match ) { |
---|
710 | $match[2] = trim($match[2]); |
---|
711 | |
---|
712 | if ( $match[2] !== "" ) { |
---|
713 | // Handle @rules |
---|
714 | switch ($match[2]) { |
---|
715 | |
---|
716 | case "import": |
---|
717 | $this->_parse_import($match[3]); |
---|
718 | break; |
---|
719 | |
---|
720 | case "media": |
---|
721 | if ( in_array(mb_strtolower(trim($match[3])), self::$ACCEPTED_MEDIA_TYPES ) ) { |
---|
722 | $this->_parse_sections($match[5]); |
---|
723 | } |
---|
724 | break; |
---|
725 | |
---|
726 | case "page": |
---|
727 | // Store the style for later... |
---|
728 | if ( is_null($this->_page_style) ) |
---|
729 | $this->_page_style = $this->_parse_properties($match[5]); |
---|
730 | else |
---|
731 | $this->_page_style->merge($this->_parse_properties($match[5])); |
---|
732 | break; |
---|
733 | |
---|
734 | default: |
---|
735 | // ignore everything else |
---|
736 | break; |
---|
737 | } |
---|
738 | |
---|
739 | continue; |
---|
740 | } |
---|
741 | |
---|
742 | if ( $match[7] !== "" ) |
---|
743 | $this->_parse_sections($match[7]); |
---|
744 | |
---|
745 | } |
---|
746 | } |
---|
747 | |
---|
748 | |
---|
749 | /** |
---|
750 | * parse @import{} sections |
---|
751 | * |
---|
752 | * @param string $url the url of the imported CSS file |
---|
753 | */ |
---|
754 | private function _parse_import($url) { |
---|
755 | $arr = preg_split("/[\s\n]/", $url); |
---|
756 | $url = array_pop($arr); |
---|
757 | $accept = false; |
---|
758 | |
---|
759 | if ( count($arr) > 0 ) { |
---|
760 | |
---|
761 | // @import url media_type [media_type...] |
---|
762 | foreach ( $arr as $type ) { |
---|
763 | if ( in_array($type, self::$ACCEPTED_MEDIA_TYPES) ) { |
---|
764 | $accept = true; |
---|
765 | break; |
---|
766 | } |
---|
767 | } |
---|
768 | |
---|
769 | } else |
---|
770 | // unconditional import |
---|
771 | $accept = true; |
---|
772 | |
---|
773 | if ( $accept ) { |
---|
774 | $url = str_replace(array('"',"url", "(", ")"), "", $url); |
---|
775 | // Store our current base url properties in case the new url is elsewhere |
---|
776 | $protocol = $this->_protocol; |
---|
777 | $host = $this->_base_host; |
---|
778 | $path = $this->_base_path; |
---|
779 | |
---|
780 | // If the protocol is php, assume that we will import using file:// |
---|
781 | $url = build_url($protocol == "php://" ? "file://" : $protocol, $host, $path, $url); |
---|
782 | |
---|
783 | $this->load_css_file($url); |
---|
784 | |
---|
785 | // Restore the current base url |
---|
786 | $this->_protocol = $protocol; |
---|
787 | $this->_base_host = $host; |
---|
788 | $this->_base_path = $path; |
---|
789 | } |
---|
790 | |
---|
791 | } |
---|
792 | |
---|
793 | /** |
---|
794 | * parse regular CSS blocks |
---|
795 | * |
---|
796 | * _parse_properties() creates a new Style object based on the provided |
---|
797 | * CSS rules. |
---|
798 | * |
---|
799 | * @param string $str CSS rules |
---|
800 | * @return Style |
---|
801 | */ |
---|
802 | private function _parse_properties($str) { |
---|
803 | $properties = explode(";", $str); |
---|
804 | |
---|
805 | // Create the style |
---|
806 | $style = new Style($this); |
---|
807 | foreach ($properties as $prop) { |
---|
808 | |
---|
809 | $prop = trim($prop); |
---|
810 | |
---|
811 | if ($prop == "") |
---|
812 | continue; |
---|
813 | |
---|
814 | $i = mb_strpos($prop, ":"); |
---|
815 | if ( $i === false ) |
---|
816 | continue; |
---|
817 | |
---|
818 | $prop_name = mb_strtolower(mb_substr($prop, 0, $i)); |
---|
819 | $value = mb_substr($prop, $i+1); |
---|
820 | $style->$prop_name = $value; |
---|
821 | |
---|
822 | } |
---|
823 | |
---|
824 | return $style; |
---|
825 | } |
---|
826 | |
---|
827 | /** |
---|
828 | * parse selector + rulesets |
---|
829 | * |
---|
830 | * @param string $str CSS selectors and rulesets |
---|
831 | */ |
---|
832 | private function _parse_sections($str) { |
---|
833 | // Pre-process: collapse all whitespace and strip whitespace around '>', |
---|
834 | // '.', ':', '+', '#' |
---|
835 | |
---|
836 | $patterns = array("/[\\s\n]+/", "/\\s+([>.:+#])\\s+/"); |
---|
837 | $replacements = array(" ", "\\1"); |
---|
838 | $str = preg_replace($patterns, $replacements, $str); |
---|
839 | |
---|
840 | $sections = explode("}", $str); |
---|
841 | foreach ($sections as $sect) { |
---|
842 | $i = mb_strpos($sect, "{"); |
---|
843 | |
---|
844 | $selectors = explode(",", mb_substr($sect, 0, $i)); |
---|
845 | $style = $this->_parse_properties(trim(mb_substr($sect, $i+1))); |
---|
846 | |
---|
847 | // Assign it to the selected elements |
---|
848 | foreach ($selectors as $selector) { |
---|
849 | $selector = trim($selector); |
---|
850 | |
---|
851 | if ($selector == "") |
---|
852 | continue; |
---|
853 | |
---|
854 | $this->add_style($selector, $style); |
---|
855 | } |
---|
856 | } |
---|
857 | } |
---|
858 | |
---|
859 | /** |
---|
860 | * dumps the entire stylesheet as a string |
---|
861 | * |
---|
862 | * Generates a string of each selector and associated style in the |
---|
863 | * Stylesheet. Useful for debugging. |
---|
864 | * |
---|
865 | * @return string |
---|
866 | */ |
---|
867 | function __toString() { |
---|
868 | $str = ""; |
---|
869 | foreach ($this->_styles as $selector => $style) |
---|
870 | $str .= "$selector => " . $style->__toString() . "\n"; |
---|
871 | |
---|
872 | return $str; |
---|
873 | } |
---|
874 | } |
---|
875 | ?> |
---|