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: dompdf.cls.php,v $
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6 | * Created on: 2004-06-09
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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: dompdf.cls.php 186 2009-10-19 22:42:06Z eclecticgeek@gmail.com $ */
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41 |
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42 | /**
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43 | * DOMPDF - PHP5 HTML to PDF renderer
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44 | *
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45 | * DOMPDF loads HTML and does its best to render it as a PDF. It gets its
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46 | * name from the new DomDocument PHP5 extension. Source HTML is first
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47 | * parsed by a DomDocument object. DOMPDF takes the resulting DOM tree and
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48 | * attaches a {@link Frame} object to each node. {@link Frame} objects store
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49 | * positioning and layout information and each has a reference to a {@link
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50 | * Style} object.
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51 | *
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52 | * Style information is loaded and parsed (see {@link Stylesheet}) and is
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53 | * applied to the frames in the tree by using XPath. CSS selectors are
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54 | * converted into XPath queries, and the computed {@link Style} objects are
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55 | * applied to the {@link Frame}s.
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56 | *
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57 | * {@link Frame}s are then decorated (in the design pattern sense of the
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58 | * word) based on their CSS display property ({@link
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59 | * http://www.w3.org/TR/CSS21/visuren.html#propdef-display}).
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60 | * Frame_Decorators augment the basic {@link Frame} class by adding
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61 | * additional properties and methods specific to the particular type of
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62 | * {@link Frame}. For example, in the CSS layout model, block frames
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63 | * (display: block;) contain line boxes that are usually filled with text or
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64 | * other inline frames. The Block_Frame_Decorator therefore adds a $lines
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65 | * property as well as methods to add {@link Frame}s to lines and to add
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66 | * additional lines. {@link Frame}s also are attached to specific
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67 | * Positioner and {@link Frame_Reflower} objects that contain the
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68 | * positioining and layout algorithm for a specific type of frame,
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69 | * respectively. This is an application of the Strategy pattern.
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70 | *
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71 | * Layout, or reflow, proceeds recursively (post-order) starting at the root
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72 | * of the document. Space constraints (containing block width & height) are
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73 | * pushed down, and resolved positions and sizes bubble up. Thus, every
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74 | * {@link Frame} in the document tree is traversed once (except for tables
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75 | * which use a two-pass layout algorithm). If you are interested in the
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76 | * details, see the reflow() method of the Reflower classes.
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77 | *
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78 | * Rendering is relatively straightforward once layout is complete. {@link
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79 | * Frame}s are rendered using an adapted {@link Cpdf} class, originally
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80 | * written by Wayne Munro, http://www.ros.co.nz/pdf/. (Some performance
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81 | * related changes have been made to the original {@link Cpdf} class, and
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82 | * the {@link CPDF_Adapter} class provides a simple, stateless interface to
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83 | * PDF generation.) PDFLib support has now also been added, via the {@link
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84 | * PDFLib_Adapter}.
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85 | *
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86 | *
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87 | * @package dompdf
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88 | */
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89 | class DOMPDF {
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90 |
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91 |
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92 | /**
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93 | * DomDocument representing the HTML document
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94 | *
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95 | * @var DomDocument
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96 | */
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97 | protected $_xml;
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98 |
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99 | /**
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100 | * Frame_Tree derived from the DOM tree
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101 | *
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102 | * @var Frame_Tree
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103 | */
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104 | protected $_tree;
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105 |
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106 | /**
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107 | * Stylesheet for the document
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108 | *
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109 | * @var Stylesheet
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110 | */
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111 | protected $_css;
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112 |
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113 | /**
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114 | * Actual PDF renderer
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115 | *
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116 | * @var Canvas
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117 | */
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118 | protected $_pdf;
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119 |
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120 | /**
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121 | * Desired paper size ('letter', 'legal', 'A4', etc.)
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122 | *
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123 | * @var string
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124 | */
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125 | protected $_paper_size;
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126 |
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127 | /**
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128 | * Paper orientation ('portrait' or 'landscape')
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129 | *
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130 | * @var string
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131 | */
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132 | protected $_paper_orientation;
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133 |
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134 | /**
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135 | * Callbacks on new page and new element
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136 | *
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137 | * @var array
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138 | */
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139 | protected $_callbacks;
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140 |
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141 | /**
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142 | * Experimental caching capability
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143 | *
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144 | * @var string
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145 | */
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146 | private $_cache_id;
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147 |
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148 | /**
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149 | * Base hostname
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150 | *
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151 | * Used for relative paths/urls
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152 | * @var string
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153 | */
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154 | protected $_base_host;
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155 |
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156 | /**
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157 | * Absolute base path
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158 | *
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159 | * Used for relative paths/urls
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160 | * @var string
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161 | */
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162 | protected $_base_path;
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163 |
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164 | /**
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165 | * Protcol used to request file (file://, http://, etc)
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166 | *
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167 | * @var string
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168 | */
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169 | protected $_protocol;
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170 |
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171 |
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172 | /**
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173 | * Class constructor
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174 | */
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175 | function __construct() {
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176 | $this->_messages = array();
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177 | $this->_xml = new DomDocument();
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178 | $this->_xml->preserveWhiteSpace = true;
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179 | $this->_tree = new Frame_Tree($this->_xml);
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180 | $this->_css = new Stylesheet();
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181 | $this->_pdf = null;
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182 | $this->_paper_size = "letter";
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183 | $this->_paper_orientation = "portrait";
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184 | $this->_base_protocol = "";
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185 | $this->_base_host = "";
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186 | $this->_base_path = "";
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187 | $this->_callbacks = array();
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188 | $this->_cache_id = null;
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189 | }
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190 |
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191 | /**
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192 | * Returns the underlying {@link Frame_Tree} object
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193 | *
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194 | * @return Frame_Tree
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195 | */
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196 | function get_tree() { return $this->_tree; }
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197 |
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198 | //........................................................................
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199 |
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200 | /**
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201 | * Sets the protocol to use
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202 | *
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203 | * @param string $proto
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204 | */
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205 | // FIXME: validate these
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206 | function set_protocol($proto) { $this->_protocol = $proto; }
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207 |
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208 | /**
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209 | * Sets the base hostname
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210 | *
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211 | * @param string $host
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212 | */
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213 | function set_host($host) { $this->_base_host = $host; }
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214 |
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215 | /**
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216 | * Sets the base path
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217 | *
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218 | * @param string $path
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219 | */
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220 | function set_base_path($path) { $this->_base_path = $path; }
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221 |
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222 | /**
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223 | * Returns the protocol in use
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224 | *
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225 | * @return string
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226 | */
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227 | function get_protocol() { return $this->_protocol; }
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228 |
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229 | /**
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230 | * Returns the base hostname
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231 | *
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232 | * @return string
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233 | */
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234 | function get_host() { return $this->_base_host; }
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235 |
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236 | /**
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237 | * Returns the base path
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238 | *
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239 | * @return string
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240 | */
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241 | function get_base_path() { return $this->_base_path; }
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242 |
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243 | /**
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244 | * Return the underlying Canvas instance (e.g. CPDF_Adapter, GD_Adapter)
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245 | *
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246 | * @return Canvas
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247 | */
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248 | function get_canvas() { return $this->_pdf; }
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249 |
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250 | /**
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251 | * Returns the callbacks array
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252 | *
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253 | * @return array
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254 | */
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255 | function get_callbacks() { return $this->_callbacks; }
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256 |
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257 | //........................................................................
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258 |
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259 | /**
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260 | * Loads an HTML file
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261 | *
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262 | * Parse errors are stored in the global array _dompdf_warnings.
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263 | *
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264 | * @param string $file a filename or url to load
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265 | */
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266 | function load_html_file($file) {
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267 | // Store parsing warnings as messages (this is to prevent output to the
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268 | // browser if the html is ugly and the dom extension complains,
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269 | // preventing the pdf from being streamed.)
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270 | if ( !$this->_protocol && !$this->_base_host && !$this->_base_path )
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271 | list($this->_protocol, $this->_base_host, $this->_base_path) = explode_url($file);
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272 |
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273 | if ( !DOMPDF_ENABLE_REMOTE &&
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274 | ($this->_protocol != "" && $this->_protocol != "file://" ) )
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275 | throw new DOMPDF_Exception("Remote file requested, but DOMPDF_ENABLE_REMOTE is false.");
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276 |
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277 | if ($this->_protocol == "" || $this->_protocol == "file://") {
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278 |
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279 | $realfile = dompdf_realpath($file);
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280 | if ( !$file )
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281 | throw new DOMPDF_Exception("File '$file' not found.");
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282 |
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283 | if ( strpos($realfile, DOMPDF_CHROOT) !== 0 )
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284 | throw new DOMPDF_Exception("Permission denied on $file.");
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285 |
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286 | // Exclude dot files (e.g. .htaccess)
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287 | if ( substr(basename($realfile),0,1) == "." )
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288 | throw new DOMPDF_Exception("Permission denied on $file.");
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289 |
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290 | $file = $realfile;
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291 | }
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292 |
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293 | $this->load_html(file_get_contents($file));
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294 | }
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295 |
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296 | /**
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297 | * Loads an HTML string
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298 | *
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299 | * Parse errors are stored in the global array _dompdf_warnings.
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300 | *
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301 | * @param string $str HTML text to load
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302 | */
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303 | function load_html($str) {
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304 | // FIXME: Determine character encoding, switch to UTF8, update meta tag. Need better http/file stream encoding detection, currently relies on text or meta tag.
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305 | mb_detect_order('auto');
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306 | if (mb_detect_encoding($str) != 'UTF-8') {
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307 | if (mb_detect_encoding($str) == '') {
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308 | if (preg_match('@<meta\s+http-equiv="Content-Type"\s+content="([\w/]+)(;\s+charset=([^\s"]+))?@i',$str,$matches)) {
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309 | $encoding = strtoupper($matches[3]);
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310 | } else {
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311 | $encoding = 'UTF-8';
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312 | }
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313 | } else {
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314 | if (preg_match('@<meta\s+http-equiv="Content-Type"\s+content="([\w/]+)(;\s+charset=([^\s"]+))?@i',$str,$matches)) {
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315 | $encoding = strtoupper($matches[3]);
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316 | } else {
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317 | $encoding = 'auto';
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318 | }
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319 | }
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320 | if ($encoding != 'UTF-8') { $str = mb_convert_encoding($str, 'UTF-8', $encoding); }
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321 | if (preg_match('@<meta\s+http-equiv="Content-Type"\s+content="([\w/]+)(;\s+charset=([^\s"]+))?@i',$str,$matches)) {
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322 | $str = preg_replace('/charset=([^\s"]+)/i','charset=UTF-8',$str);
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323 | } else {
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324 | $str = str_replace('<head>', '<head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8">', $str);
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325 | }
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326 | }
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327 |
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328 | // Parse embedded php, first-pass
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329 | if ( DOMPDF_ENABLE_PHP ) {
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330 | ob_start();
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331 | eval("?" . ">$str");
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332 | $str = ob_get_contents();
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333 | ob_end_clean();
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334 | }
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335 |
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336 | // Store parsing warnings as messages
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337 | set_error_handler("record_warnings");
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338 | $this->_xml->loadHTML($str);
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339 | restore_error_handler();
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340 | }
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341 |
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342 | /**
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343 | * Builds the {@link Frame_Tree}, loads any CSS and applies the styles to
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344 | * the {@link Frame_Tree}
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345 | */
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346 | protected function _process_html() {
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347 | $this->_tree->build_tree();
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348 |
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349 | $this->_css->load_css_file(Stylesheet::DEFAULT_STYLESHEET);
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350 |
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351 | $acceptedmedia = Stylesheet::$ACCEPTED_GENERIC_MEDIA_TYPES;
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352 | if ( defined("DOMPDF_DEFAULT_MEDIA_TYPE") ) {
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353 | $acceptedmedia[] = DOMPDF_DEFAULT_MEDIA_TYPE;
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354 | } else {
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355 | $acceptedmedia[] = Stylesheet::$ACCEPTED_DEFAULT_MEDIA_TYPE;
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356 | }
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357 |
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358 | // load <link rel="STYLESHEET" ... /> tags
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359 | $links = $this->_xml->getElementsByTagName("link");
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360 | foreach ($links as $link) {
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361 | if ( mb_strtolower($link->getAttribute("rel")) == "stylesheet" ||
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362 | mb_strtolower($link->getAttribute("type")) == "text/css" ) {
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363 | //Check if the css file is for an accepted media type
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364 | //media not given then always valid
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365 | $formedialist = preg_split("/[\s\n,]/", $link->getAttribute("media"),-1, PREG_SPLIT_NO_EMPTY);
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366 | if ( count($formedialist) > 0 ) {
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367 | $accept = false;
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368 | foreach ( $formedialist as $type ) {
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369 | if ( in_array(mb_strtolower(trim($type)), $acceptedmedia) ) {
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370 | $accept = true;
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371 | break;
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372 | }
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373 | }
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374 | if (!$accept) {
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375 | //found at least one mediatype, but none of the accepted ones
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376 | //Skip this css file.
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377 | continue;
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378 | }
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379 | }
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380 |
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381 | $url = $link->getAttribute("href");
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382 | $url = build_url($this->_protocol, $this->_base_host, $this->_base_path, $url);
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383 |
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384 | $this->_css->load_css_file($url);
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385 | }
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386 |
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387 | }
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388 |
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389 | // load <style> tags
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390 | $styles = $this->_xml->getElementsByTagName("style");
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391 | foreach ($styles as $style) {
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392 |
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393 | // Accept all <style> tags by default (note this is contrary to W3C
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394 | // HTML 4.0 spec:
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395 | // http://www.w3.org/TR/REC-html40/present/styles.html#adef-media
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396 | // which states that the default media type is 'screen'
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397 | if ( $style->hasAttributes() &&
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398 | ($media = $style->getAttribute("media")) &&
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399 | !in_array($media, $acceptedmedia) )
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400 | continue;
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401 |
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402 | $css = "";
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403 | if ( $style->hasChildNodes() ) {
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404 |
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405 | $child = $style->firstChild;
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406 | while ( $child ) {
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407 | $css .= $child->nodeValue; // Handle <style><!-- blah --></style>
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408 | $child = $child->nextSibling;
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409 | }
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410 |
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411 | } else
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412 | $css = $style->nodeValue;
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413 |
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414 | // Set the base path of the Stylesheet to that of the file being processed
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415 | $this->_css->set_protocol($this->_protocol);
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416 | $this->_css->set_host($this->_base_host);
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417 | $this->_css->set_base_path($this->_base_path);
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418 |
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419 | $this->_css->load_css($css);
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420 | }
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421 |
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422 | }
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423 |
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424 | //........................................................................
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425 |
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426 | /**
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427 | * Sets the paper size & orientation
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428 | *
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429 | * @param string $size 'letter', 'legal', 'A4', etc. {@link CPDF_Adapter::$PAPER_SIZES}
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430 | * @param string $orientation 'portrait' or 'landscape'
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431 | */
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432 | function set_paper($size, $orientation = "portrait") {
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433 | $this->_paper_size = $size;
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434 | $this->_paper_orientation = $orientation;
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435 | }
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436 |
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437 | //........................................................................
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438 |
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439 | /**
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440 | * Enable experimental caching capability
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441 | * @access private
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442 | */
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443 | function enable_caching($cache_id) {
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444 | $this->_cache_id = $cache_id;
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445 | }
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446 |
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447 | //........................................................................
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448 |
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449 | /**
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450 | * Sets callbacks for events like rendering of pages and elements.
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451 | * The callbacks array contains arrays with 'event' set to 'begin_page',
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452 | * 'end_page', 'begin_frame', or 'end_frame' and 'f' set to a function or
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453 | * object plus method to be called.
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454 | *
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455 | * The function 'f' must take an array as argument, which contains info
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456 | * about the event.
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457 | *
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458 | * @param array $callbacks the set of callbacks to set
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459 | */
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460 | function set_callbacks($callbacks) {
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461 | if (is_array($callbacks)) {
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462 | $this->_callbacks = array();
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463 | foreach ($callbacks as $c) {
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464 | if (is_array($c) && isset($c['event']) && isset($c['f'])) {
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465 | $event = $c['event'];
|
---|
466 | $f = $c['f'];
|
---|
467 | if (is_callable($f) && is_string($event)) {
|
---|
468 | $this->_callbacks[$event][] = $f;
|
---|
469 | }
|
---|
470 | }
|
---|
471 | }
|
---|
472 | }
|
---|
473 | }
|
---|
474 |
|
---|
475 | //........................................................................
|
---|
476 |
|
---|
477 | /**
|
---|
478 | * Renders the HTML to PDF
|
---|
479 | */
|
---|
480 | function render() {
|
---|
481 |
|
---|
482 | //enable_mem_profile();
|
---|
483 |
|
---|
484 | $this->_process_html();
|
---|
485 |
|
---|
486 | $this->_css->apply_styles($this->_tree);
|
---|
487 |
|
---|
488 | $root = null;
|
---|
489 |
|
---|
490 | foreach ($this->_tree->get_frames() as $frame) {
|
---|
491 | // Set up the root frame
|
---|
492 |
|
---|
493 | if ( is_null($root) ) {
|
---|
494 | $root = Frame_Factory::decorate_root( $this->_tree->get_root(), $this );
|
---|
495 | continue;
|
---|
496 | }
|
---|
497 |
|
---|
498 | // Create the appropriate decorators, reflowers & positioners.
|
---|
499 | $deco = Frame_Factory::decorate_frame($frame, $this);
|
---|
500 | $deco->set_root($root);
|
---|
501 |
|
---|
502 | // FIXME: handle generated content
|
---|
503 | if ( $frame->get_style()->display == "list-item" ) {
|
---|
504 |
|
---|
505 | // Insert a list-bullet frame
|
---|
506 | $node = $this->_xml->createElement("bullet"); // arbitrary choice
|
---|
507 | $b_f = new Frame($node);
|
---|
508 |
|
---|
509 | $style = $this->_css->create_style();
|
---|
510 | $style->display = "-dompdf-list-bullet";
|
---|
511 | $style->inherit($frame->get_style());
|
---|
512 | $b_f->set_style($style);
|
---|
513 |
|
---|
514 | $deco->prepend_child( Frame_Factory::decorate_frame($b_f, $this) );
|
---|
515 | }
|
---|
516 |
|
---|
517 | }
|
---|
518 |
|
---|
519 | $this->_pdf = Canvas_Factory::get_instance($this->_paper_size, $this->_paper_orientation);
|
---|
520 |
|
---|
521 | $root->set_containing_block(0, 0, $this->_pdf->get_width(), $this->_pdf->get_height());
|
---|
522 | $root->set_renderer(new Renderer($this));
|
---|
523 |
|
---|
524 | // This is where the magic happens:
|
---|
525 | $root->reflow();
|
---|
526 |
|
---|
527 | // Clean up cached images
|
---|
528 | Image_Cache::clear();
|
---|
529 |
|
---|
530 | if ( $GLOBALS['_dompdf_show_warnings'] ) {
|
---|
531 | global $_dompdf_warnings;
|
---|
532 | echo '<b>DOMPDF Warnings</b><br><pre>';
|
---|
533 | foreach ($_dompdf_warnings as $msg)
|
---|
534 | echo $msg . "\n";
|
---|
535 | echo $this->get_canvas()->get_cpdf()->messages;
|
---|
536 | echo '</pre>';
|
---|
537 | flush();
|
---|
538 | }
|
---|
539 | }
|
---|
540 |
|
---|
541 | //........................................................................
|
---|
542 |
|
---|
543 | /**
|
---|
544 | * Add meta information to the PDF after rendering
|
---|
545 | */
|
---|
546 | function add_info($label, $value) {
|
---|
547 | if (!is_null($this->_pdf))
|
---|
548 | $this->_pdf->add_info($label, $value);
|
---|
549 | }
|
---|
550 |
|
---|
551 | //........................................................................
|
---|
552 |
|
---|
553 | /**
|
---|
554 | * Streams the PDF to the client
|
---|
555 | *
|
---|
556 | * The file will open a download dialog by default. The options
|
---|
557 | * parameter controls the output. Accepted options are:
|
---|
558 | *
|
---|
559 | * 'Accept-Ranges' => 1 or 0 - if this is not set to 1, then this
|
---|
560 | * header is not included, off by default this header seems to
|
---|
561 | * have caused some problems despite the fact that it is supposed
|
---|
562 | * to solve them, so I am leaving it off by default.
|
---|
563 | *
|
---|
564 | * 'compress' = > 1 or 0 - apply content stream compression, this is
|
---|
565 | * on (1) by default
|
---|
566 | *
|
---|
567 | * 'Attachment' => 1 or 0 - if 1, force the browser to open a
|
---|
568 | * download dialog, on (1) by default
|
---|
569 | *
|
---|
570 | * @param string $filename the name of the streamed file
|
---|
571 | * @param array $options header options (see above)
|
---|
572 | */
|
---|
573 | function stream($filename, $options = null) {
|
---|
574 | if (!is_null($this->_pdf))
|
---|
575 | $this->_pdf->stream($filename, $options);
|
---|
576 | }
|
---|
577 |
|
---|
578 | /**
|
---|
579 | * Returns the PDF as a string
|
---|
580 | *
|
---|
581 | * The file will open a download dialog by default. The options
|
---|
582 | * parameter controls the output. Accepted options are:
|
---|
583 | *
|
---|
584 | *
|
---|
585 | * 'compress' = > 1 or 0 - apply content stream compression, this is
|
---|
586 | * on (1) by default
|
---|
587 | *
|
---|
588 | *
|
---|
589 | * @param array $options options (see above)
|
---|
590 | * @return string
|
---|
591 | */
|
---|
592 | function output($options = null) {
|
---|
593 |
|
---|
594 | if ( is_null($this->_pdf) )
|
---|
595 | return null;
|
---|
596 |
|
---|
597 | return $this->_pdf->output( $options );
|
---|
598 | }
|
---|
599 |
|
---|
600 |
|
---|
601 | /**
|
---|
602 | * Returns the underlying HTML document as a string
|
---|
603 | *
|
---|
604 | * @return string
|
---|
605 | */
|
---|
606 | function output_html() {
|
---|
607 | return $this->_xml->saveHTML();
|
---|
608 | }
|
---|
609 | //........................................................................
|
---|
610 |
|
---|
611 | }
|
---|
612 | ?> |
---|