[3019] | 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: text_frame_reflower.cls.php,v $ |
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| 6 | * Created on: 2004-06-17 |
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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: text_frame_reflower.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 | * Reflows text frames. |
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| 44 | * |
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| 45 | * @access private |
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| 46 | * @package dompdf |
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| 47 | */ |
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| 48 | class Text_Frame_Reflower extends Frame_Reflower { |
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| 49 | |
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| 50 | protected $_block_parent; // Nearest block-level ancestor |
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| 51 | |
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| 52 | function __construct(Text_Frame_Decorator $frame) { |
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| 53 | parent::__construct($frame); |
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| 54 | $this->_block_parent = null; |
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| 55 | |
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| 56 | // Handle text transform |
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| 57 | $transform = $this->_frame->get_style()->text_transform; |
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| 58 | switch ( strtolower($transform) ) { |
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| 59 | case "capitalize": |
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| 60 | $this->_frame->set_text( ucwords($this->_frame->get_text()) ); |
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| 61 | break; |
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| 62 | |
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| 63 | case "uppercase": |
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| 64 | $this->_frame->set_text( strtoupper($this->_frame->get_text()) ); |
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| 65 | break; |
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| 66 | |
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| 67 | case "lowercase": |
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| 68 | $this->_frame->set_text( strtolower($this->_frame->get_text()) ); |
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| 69 | break; |
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| 70 | |
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| 71 | default: |
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| 72 | // Do nothing |
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| 73 | break; |
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| 74 | } |
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| 75 | } |
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| 76 | |
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| 77 | //........................................................................ |
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| 78 | |
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| 79 | protected function _collapse_white_space($text) { |
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| 80 | //$text = $this->_frame->get_text(); |
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| 81 | // if ( $this->_block_parent->get_current_line("w") == 0 ) |
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| 82 | // $text = ltrim($text, " \n\r\t"); |
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| 83 | return preg_replace("/[\s\n]+/u", " ", $text); |
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| 84 | } |
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| 85 | |
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| 86 | //........................................................................ |
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| 87 | |
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| 88 | protected function _line_break($text) { |
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| 89 | $style = $this->_frame->get_style(); |
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| 90 | $size = $style->font_size; |
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| 91 | $font = $style->font_family; |
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| 92 | |
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| 93 | // Determine the available width |
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| 94 | $line_width = $this->_frame->get_containing_block("w"); |
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| 95 | $current_line_width = $this->_block_parent->get_current_line("w"); |
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| 96 | |
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| 97 | $available_width = $line_width - $current_line_width; |
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| 98 | |
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| 99 | // split the text into words |
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| 100 | $words = preg_split('/([\s-]+)/u', $text, -1, PREG_SPLIT_DELIM_CAPTURE); |
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| 101 | $wc = count($words); |
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| 102 | |
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| 103 | // Account for word-spacing |
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| 104 | $word_spacing = $style->length_in_pt($style->word_spacing); |
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| 105 | |
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| 106 | // Determine the frame width including margin, padding & border |
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| 107 | $text_width = Font_Metrics::get_text_width($text, $font, $size, $word_spacing); |
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| 108 | $mbp_width = |
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| 109 | $style->length_in_pt( array( $style->margin_left, |
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| 110 | $style->border_left_width, |
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| 111 | $style->padding_left, |
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| 112 | $style->padding_right, |
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| 113 | $style->border_right_width, |
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| 114 | $style->margin_right), $line_width ); |
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| 115 | $frame_width = $text_width + $mbp_width; |
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| 116 | |
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| 117 | // Debugging: |
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| 118 | // pre_r("Text: '" . htmlspecialchars($text). "'"); |
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| 119 | // pre_r("width: " .$frame_width); |
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| 120 | // pre_r("textwidth + delta: $text_width + $mbp_width"); |
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| 121 | // pre_r("font-size: $size"); |
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| 122 | // pre_r("cb[w]: " .$line_width); |
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| 123 | // pre_r("available width: " . $available_width); |
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| 124 | // pre_r("current line width: " . $current_line_width); |
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| 125 | |
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| 126 | // pre_r($words); |
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| 127 | |
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| 128 | if ( $frame_width <= $available_width ) |
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| 129 | return false; |
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| 130 | |
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| 131 | // Determine the split point |
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| 132 | $width = 0; |
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| 133 | $str = ""; |
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| 134 | reset($words); |
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| 135 | |
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| 136 | for ($i = 0; $i < count($words); $i += 2) { |
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| 137 | $word = $words[$i] . (isset($words[$i+1]) ? $words[$i+1] : ""); |
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| 138 | $word_width = Font_Metrics::get_text_width($word, $font, $size, $word_spacing); |
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| 139 | if ( $width + $word_width + $mbp_width > $available_width ) |
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| 140 | break; |
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| 141 | |
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| 142 | $width += $word_width; |
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| 143 | $str .= $word; |
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| 144 | |
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| 145 | } |
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| 146 | |
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| 147 | // The first word has overflowed. Force it onto the line |
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| 148 | if ( $current_line_width == 0 && $width == 0 ) { |
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| 149 | $width += $word_width; |
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| 150 | $str .= $word; |
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| 151 | } |
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| 152 | |
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| 153 | $offset = mb_strlen($str); |
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| 154 | |
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| 155 | // More debugging: |
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| 156 | // pre_var_dump($str); |
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| 157 | // pre_r("Width: ". $width); |
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| 158 | // pre_r("Offset: " . $offset); |
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| 159 | |
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| 160 | return $offset; |
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| 161 | |
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| 162 | } |
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| 163 | |
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| 164 | //........................................................................ |
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| 165 | |
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| 166 | protected function _newline_break($text) { |
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| 167 | |
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| 168 | if ( ($i = mb_strpos($text, "\n")) === false) |
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| 169 | return false; |
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| 170 | |
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| 171 | return $i+1; |
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| 172 | |
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| 173 | } |
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| 174 | |
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| 175 | //........................................................................ |
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| 176 | |
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| 177 | protected function _layout_line() { |
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| 178 | $style = $this->_frame->get_style(); |
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| 179 | $text = $this->_frame->get_text(); |
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| 180 | $size = $style->font_size; |
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| 181 | $font = $style->font_family; |
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| 182 | $word_spacing = $style->length_in_pt($style->word_spacing); |
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| 183 | |
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| 184 | // Determine the text height |
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| 185 | $style->height = Font_Metrics::get_font_height( $font, $size ); |
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| 186 | |
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| 187 | $split = false; |
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| 188 | $add_line = false; |
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| 189 | |
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| 190 | // Handle text transform: |
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| 191 | // http://www.w3.org/TR/CSS21/text.html#propdef-text-transform |
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| 192 | |
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| 193 | switch ($style->text_transform) { |
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| 194 | |
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| 195 | default: |
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| 196 | break; |
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| 197 | |
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| 198 | case "capitalize": |
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| 199 | $text = mb_convert_case($text, MB_CASE_TITLE, 'UTF-8'); |
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| 200 | break; |
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| 201 | |
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| 202 | case "uppercase": |
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| 203 | $text = mb_convert_case($text, MB_CASE_UPPER, 'UTF-8'); |
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| 204 | break; |
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| 205 | |
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| 206 | case "lowercase": |
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| 207 | $text = mb_convert_case($text, MB_CASE_LOWER, 'UTF-8'); |
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| 208 | break; |
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| 209 | |
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| 210 | } |
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| 211 | |
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| 212 | // Handle white-space property: |
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| 213 | // http://www.w3.org/TR/CSS21/text.html#propdef-white-space |
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| 214 | |
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| 215 | switch ($style->white_space) { |
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| 216 | |
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| 217 | default: |
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| 218 | case "normal": |
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| 219 | $this->_frame->set_text( $text = $this->_collapse_white_space($text) ); |
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| 220 | if ( $text == "" ) |
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| 221 | break; |
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| 222 | |
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| 223 | $split = $this->_line_break($text); |
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| 224 | break; |
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| 225 | |
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| 226 | case "pre": |
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| 227 | $split = $this->_newline_break($text); |
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| 228 | $add_line = $split !== false; |
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| 229 | break; |
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| 230 | |
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| 231 | case "nowrap": |
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| 232 | $this->_frame->set_text( $text = $this->_collapse_white_space($text) ); |
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| 233 | break; |
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| 234 | |
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| 235 | case "pre-wrap": |
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| 236 | $split = $this->_newline_break($text); |
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| 237 | |
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| 238 | if ( ($tmp = $this->_line_break($text)) !== false ) { |
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| 239 | $add_line = $split < $tmp; |
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| 240 | $split = min($tmp, $split); |
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| 241 | } else |
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| 242 | $add_line = true; |
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| 243 | |
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| 244 | break; |
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| 245 | |
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| 246 | case "pre-line": |
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| 247 | // Collapse white-space except for \n |
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| 248 | $this->_frame->set_text( $text = preg_replace( "/[ \t]+/u", " ", $text ) ); |
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| 249 | |
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| 250 | if ( $text == "" ) |
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| 251 | break; |
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| 252 | |
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| 253 | $split = $this->_newline_break($text); |
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| 254 | |
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| 255 | if ( ($tmp = $this->_line_break($text)) !== false ) { |
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| 256 | $add_line = $split < $tmp; |
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| 257 | $split = min($tmp, $split); |
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| 258 | } else |
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| 259 | $add_line = true; |
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| 260 | |
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| 261 | break; |
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| 262 | |
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| 263 | } |
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| 264 | |
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| 265 | // Handle degenerate case |
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| 266 | if ( $text === "" ) |
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| 267 | return; |
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| 268 | |
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| 269 | if ( $split !== false) { |
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| 270 | |
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| 271 | // Handle edge cases |
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| 272 | if ( $split == 0 && $text == " " ) { |
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| 273 | $this->_frame->set_text(""); |
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| 274 | return; |
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| 275 | } |
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| 276 | |
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| 277 | if ( $split == 0 ) { |
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| 278 | |
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| 279 | // Trim newlines from the beginning of the line |
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| 280 | //$this->_frame->set_text(ltrim($text, "\n\r")); |
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| 281 | |
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| 282 | $this->_block_parent->add_line(); |
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| 283 | $this->_frame->position(); |
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| 284 | |
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| 285 | // Layout the new line |
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| 286 | $this->_layout_line(); |
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| 287 | |
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| 288 | } else if ( $split < mb_strlen($this->_frame->get_text()) ) { |
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| 289 | |
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| 290 | // split the line if required |
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| 291 | $this->_frame->split_text($split); |
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| 292 | |
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| 293 | // Remove any trailing newlines |
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| 294 | $t = $this->_frame->get_text(); |
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| 295 | |
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| 296 | if ( $split > 1 && $t{$split-1} == "\n" ) |
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| 297 | $this->_frame->set_text( mb_substr($t, 0, -1) ); |
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| 298 | |
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| 299 | } |
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| 300 | |
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| 301 | if ( $add_line ) { |
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| 302 | $this->_block_parent->add_line(); |
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| 303 | $this->_frame->position(); |
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| 304 | } |
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| 305 | |
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| 306 | // Set our new width |
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| 307 | $this->_frame->recalculate_width(); |
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| 308 | |
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| 309 | } else { |
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| 310 | |
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| 311 | $this->_frame->recalculate_width(); |
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| 312 | |
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| 313 | } |
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| 314 | } |
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| 315 | |
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| 316 | //........................................................................ |
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| 317 | |
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| 318 | function reflow() { |
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| 319 | |
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| 320 | $this->_block_parent = $this->_frame->find_block_parent(); |
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| 321 | |
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| 322 | // Left trim the text if this is the first text on the line and we're |
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| 323 | // collapsing white space |
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| 324 | // if ( $this->_block_parent->get_current_line("w") == 0 && |
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| 325 | // ($this->_frame->get_style()->white_space != "pre" || |
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| 326 | // $this->_frame->get_style()->white_space != "pre-wrap") ) { |
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| 327 | // $this->_frame->set_text( ltrim( $this->_frame->get_text() ) ); |
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| 328 | // } |
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| 329 | |
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| 330 | $this->_frame->position(); |
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| 331 | |
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| 332 | $this->_layout_line(); |
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| 333 | |
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| 334 | } |
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| 335 | |
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| 336 | //........................................................................ |
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| 337 | |
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| 338 | // Returns an array(0 => min, 1 => max, "min" => min, "max" => max) of the |
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| 339 | // minimum and maximum widths of this frame |
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| 340 | function get_min_max_width() { |
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| 341 | |
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| 342 | $style = $this->_frame->get_style(); |
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| 343 | $this->_block_parent = $this->_frame->find_block_parent(); |
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| 344 | $line_width = $this->_frame->get_containing_block("w"); |
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| 345 | |
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| 346 | $str = $text = $this->_frame->get_text(); |
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| 347 | $size = $style->font_size; |
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| 348 | $font = $style->font_family; |
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| 349 | |
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| 350 | $spacing = $style->length_in_pt($style->word_spacing); |
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| 351 | |
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| 352 | switch($style->white_space) { |
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| 353 | |
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| 354 | default: |
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| 355 | case "normal": |
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| 356 | $str = preg_replace("/[\s\n]+/u"," ", $str); |
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| 357 | case "pre-wrap": |
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| 358 | case "pre-line": |
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| 359 | |
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| 360 | // Find the longest word (i.e. minimum length) |
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| 361 | |
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| 362 | // This technique (using arrays & an anonymous function) is actually |
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| 363 | // faster than doing a single-pass character by character scan. Heh, |
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| 364 | // yes I took the time to bench it ;) |
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| 365 | $words = array_flip(preg_split("/[\s-]+/u",$str, -1, PREG_SPLIT_DELIM_CAPTURE)); |
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| 366 | array_walk($words, create_function('&$val,$str', |
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| 367 | '$val = Font_Metrics::get_text_width($str, "'.$font.'", '.$size.', '.$spacing.');')); |
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| 368 | arsort($words); |
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| 369 | $min = reset($words); |
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| 370 | break; |
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| 371 | |
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| 372 | case "pre": |
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| 373 | $lines = array_flip(preg_split("/\n/u", $str)); |
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| 374 | array_walk($lines, create_function('&$val,$str', |
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| 375 | '$val = Font_Metrics::get_text_width($str, "'.$font.'", '.$size.', '.$spacing.');')); |
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| 376 | |
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| 377 | arsort($lines); |
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| 378 | $min = reset($lines); |
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| 379 | break; |
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| 380 | |
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| 381 | case "nowrap": |
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| 382 | $min = Font_Metrics::get_text_width($this->_collapse_white_space($str), $font, $size, $spacing); |
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| 383 | break; |
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| 384 | |
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| 385 | } |
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| 386 | |
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| 387 | switch ($style->white_space) { |
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| 388 | |
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| 389 | default: |
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| 390 | case "normal": |
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| 391 | case "nowrap": |
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| 392 | $str = preg_replace("/[\s\n]+/u"," ", $text); |
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| 393 | break; |
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| 394 | |
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| 395 | case "pre-line": |
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| 396 | $str = preg_replace( "/[ \t]+/u", " ", $text); |
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| 397 | |
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| 398 | case "pre-wrap": |
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| 399 | // Find the longest word (i.e. minimum length) |
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| 400 | $lines = array_flip(preg_split("/\n/", $text)); |
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| 401 | array_walk($lines, create_function('&$val,$str', |
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| 402 | '$val = Font_Metrics::get_text_width($str, "'.$font.'", '.$size.', '.$spacing.');')); |
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| 403 | arsort($lines); |
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| 404 | reset($lines); |
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| 405 | $str = key($lines); |
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| 406 | break; |
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| 407 | |
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| 408 | } |
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| 409 | |
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| 410 | $max = Font_Metrics::get_text_width($str, $font, $size, $spacing); |
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| 411 | |
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| 412 | $delta = $style->length_in_pt(array($style->margin_left, |
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| 413 | $style->border_left_width, |
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| 414 | $style->padding_left, |
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| 415 | $style->padding_right, |
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| 416 | $style->border_right_width, |
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| 417 | $style->margin_right), $line_width); |
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| 418 | $min += $delta; |
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| 419 | $max += $delta; |
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| 420 | |
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| 421 | return array($min, $max, "min" => $min, "max" => $max); |
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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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