* @author Fabien Ménager * @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License */ /** * Reflows text frames. * * @access private * @package dompdf */ class Text_Frame_Reflower extends Frame_Reflower { /** * @var Block_Frame_Decorator */ protected $_block_parent; // Nearest block-level ancestor /** * @var Text_Frame_Decorator */ protected $_frame; public static $_whitespace_pattern = "/[ \t\r\n\f]+/u"; function __construct(Text_Frame_Decorator $frame) { parent::__construct($frame); } //........................................................................ protected function _collapse_white_space($text) { //$text = $this->_frame->get_text(); // if ( $this->_block_parent->get_current_line_box->w == 0 ) // $text = ltrim($text, " \n\r\t"); return preg_replace(self::$_whitespace_pattern, " ", $text); } //........................................................................ protected function _line_break($text) { $style = $this->_frame->get_style(); $size = $style->font_size; $font = $style->font_family; $current_line = $this->_block_parent->get_current_line_box(); // Determine the available width $line_width = $this->_frame->get_containing_block("w"); $current_line_width = $current_line->left + $current_line->w + $current_line->right; $available_width = $line_width - $current_line_width; // Account for word-spacing $word_spacing = $style->length_in_pt($style->word_spacing); $char_spacing = $style->length_in_pt($style->letter_spacing); // Determine the frame width including margin, padding & border $text_width = Font_Metrics::get_text_width($text, $font, $size, $word_spacing, $char_spacing); $mbp_width = $style->length_in_pt( array( $style->margin_left, $style->border_left_width, $style->padding_left, $style->padding_right, $style->border_right_width, $style->margin_right), $line_width ); $frame_width = $text_width + $mbp_width; // Debugging: // pre_r("Text: '" . htmlspecialchars($text). "'"); // pre_r("width: " .$frame_width); // pre_r("textwidth + delta: $text_width + $mbp_width"); // pre_r("font-size: $size"); // pre_r("cb[w]: " .$line_width); // pre_r("available width: " . $available_width); // pre_r("current line width: " . $current_line_width); // pre_r($words); if ( $frame_width <= $available_width ) return false; // split the text into words $words = preg_split('/([\s-]+)/u', $text, -1, PREG_SPLIT_DELIM_CAPTURE); $wc = count($words); // Determine the split point $width = 0; $str = ""; reset($words); // @todo support , for ($i = 0; $i < $wc; $i += 2) { $word = $words[$i] . (isset($words[$i+1]) ? $words[$i+1] : ""); $word_width = Font_Metrics::get_text_width($word, $font, $size, $word_spacing, $char_spacing); if ( $width + $word_width + $mbp_width > $available_width ) break; $width += $word_width; $str .= $word; } $break_word = ($style->word_wrap === "break-word"); // The first word has overflowed. Force it onto the line if ( $current_line_width == 0 && $width == 0 ) { $s = ""; $last_width = 0; if ( $break_word ) { for ( $j = 0; $j < strlen($word); $j++ ) { $s .= $word[$j]; $_width = Font_Metrics::get_text_width($s, $font, $size, $word_spacing, $char_spacing); if ($_width > $available_width) { break; } $last_width = $_width; } } if ( $break_word && $last_width > 0 ) { $width += $last_width; $str .= substr($s, 0, -1); } else { $width += $word_width; $str .= $word; } } $offset = mb_strlen($str); // More debugging: // pre_var_dump($str); // pre_r("Width: ". $width); // pre_r("Offset: " . $offset); return $offset; } //........................................................................ protected function _newline_break($text) { if ( ($i = mb_strpos($text, "\n")) === false) return false; return $i+1; } //........................................................................ protected function _layout_line() { $frame = $this->_frame; $style = $frame->get_style(); $text = $frame->get_text(); $size = $style->font_size; $font = $style->font_family; // Determine the text height $style->height = Font_Metrics::get_font_height( $font, $size ); $split = false; $add_line = false; // Handle text transform: // http://www.w3.org/TR/CSS21/text.html#propdef-text-transform switch (strtolower($style->text_transform)) { default: break; case "capitalize": $text = mb_convert_case($text, MB_CASE_TITLE); break; case "uppercase": $text = mb_convert_case($text, MB_CASE_UPPER); break; case "lowercase": $text = mb_convert_case($text, MB_CASE_LOWER); break; } // Handle white-space property: // http://www.w3.org/TR/CSS21/text.html#propdef-white-space switch ($style->white_space) { default: case "normal": $frame->set_text( $text = $this->_collapse_white_space($text) ); if ( $text == "" ) break; $split = $this->_line_break($text); break; case "pre": $split = $this->_newline_break($text); $add_line = $split !== false; break; case "nowrap": $frame->set_text( $text = $this->_collapse_white_space($text) ); break; case "pre-wrap": $split = $this->_newline_break($text); if ( ($tmp = $this->_line_break($text)) !== false ) { $add_line = $split < $tmp; $split = min($tmp, $split); } else $add_line = true; break; case "pre-line": // Collapse white-space except for \n $frame->set_text( $text = preg_replace( "/[ \t]+/u", " ", $text ) ); if ( $text == "" ) break; $split = $this->_newline_break($text); if ( ($tmp = $this->_line_break($text)) !== false ) { $add_line = $split < $tmp; $split = min($tmp, $split); } else $add_line = true; break; } // Handle degenerate case if ( $text === "" ) return; if ( $split !== false) { // Handle edge cases if ( $split == 0 && $text === " " ) { $frame->set_text(""); return; } if ( $split == 0 ) { // Trim newlines from the beginning of the line //$this->_frame->set_text(ltrim($text, "\n\r")); $this->_block_parent->add_line(); $frame->position(); // Layout the new line $this->_layout_line(); } else if ( $split < mb_strlen($frame->get_text()) ) { // split the line if required $frame->split_text($split); $t = $frame->get_text(); // Remove any trailing newlines if ( $split > 1 && $t[$split-1] === "\n" && !$frame->is_pre() ) $frame->set_text( mb_substr($t, 0, -1) ); // Do we need to trim spaces on wrapped lines? This might be desired, however, we // can't trim the lines here or the layout will be affected if trimming the line // leaves enough space to fit the next word in the text stream (because pdf layout // is performed elsewhere). /*if (!$this->_frame->get_prev_sibling() && !$this->_frame->get_next_sibling()) { $t = $this->_frame->get_text(); $this->_frame->set_text( trim($t) ); }*/ } if ( $add_line ) { $this->_block_parent->add_line(); $frame->position(); } } else { // Remove empty space from start and end of line, but only where there isn't an inline sibling // and the parent node isn't an inline element with siblings // FIXME: Include non-breaking spaces? $t = $frame->get_text(); $parent = $frame->get_parent(); $is_inline_frame = get_class($parent) === 'Inline_Frame_Decorator'; if ((!$is_inline_frame && !$frame->get_next_sibling()) || ( $is_inline_frame && !$parent->get_next_sibling())) { $t = rtrim($t); } if ((!$is_inline_frame && !$frame->get_prev_sibling())/* || ( $is_inline_frame && !$parent->get_prev_sibling())*/) { // AB C fails (the whitespace is removed) $t = ltrim($t); } $frame->set_text( $t ); } // Set our new width $width = $frame->recalculate_width(); } //........................................................................ function reflow(Block_Frame_Decorator $block = null) { $frame = $this->_frame; $page = $frame->get_root(); $page->check_forced_page_break($this->_frame); if ( $page->is_full() ) return; $this->_block_parent = /*isset($block) ? $block : */$frame->find_block_parent(); // Left trim the text if this is the first text on the line and we're // collapsing white space // if ( $this->_block_parent->get_current_line()->w == 0 && // ($frame->get_style()->white_space !== "pre" || // $frame->get_style()->white_space !== "pre-wrap") ) { // $frame->set_text( ltrim( $frame->get_text() ) ); // } $frame->position(); $this->_layout_line(); if ( $block ) { $block->add_frame_to_line($frame); } } //........................................................................ // Returns an array(0 => min, 1 => max, "min" => min, "max" => max) of the // minimum and maximum widths of this frame function get_min_max_width() { /*if ( !is_null($this->_min_max_cache) ) return $this->_min_max_cache;*/ $frame = $this->_frame; $style = $frame->get_style(); $this->_block_parent = $frame->find_block_parent(); $line_width = $frame->get_containing_block("w"); $str = $text = $frame->get_text(); $size = $style->font_size; $font = $style->font_family; $word_spacing = $style->length_in_pt($style->word_spacing); $char_spacing = $style->length_in_pt($style->letter_spacing); switch($style->white_space) { default: case "normal": $str = preg_replace(self::$_whitespace_pattern," ", $str); case "pre-wrap": case "pre-line": // Find the longest word (i.e. minimum length) // This technique (using arrays & an anonymous function) is actually // faster than doing a single-pass character by character scan. Heh, // yes I took the time to bench it ;) $words = array_flip(preg_split("/[\s-]+/u",$str, -1, PREG_SPLIT_DELIM_CAPTURE)); /*foreach($words as &$word) { $word = Font_Metrics::get_text_width($word, $font, $size, $word_spacing, $char_spacing); }*/ array_walk($words, create_function('&$val,$str', '$val = Font_Metrics::get_text_width($str, "'.addslashes($font).'", '.$size.', '.$word_spacing.', '.$char_spacing.');')); arsort($words); $min = reset($words); break; case "pre": $lines = array_flip(preg_split("/\n/u", $str)); /*foreach($words as &$word) { $word = Font_Metrics::get_text_width($word, $font, $size, $word_spacing, $char_spacing); }*/ array_walk($lines, create_function('&$val,$str', '$val = Font_Metrics::get_text_width($str, "'.addslashes($font).'", '.$size.', '.$word_spacing.', '.$char_spacing.');')); arsort($lines); $min = reset($lines); break; case "nowrap": $min = Font_Metrics::get_text_width($this->_collapse_white_space($str), $font, $size, $word_spacing, $char_spacing); break; } switch ($style->white_space) { default: case "normal": case "nowrap": $str = preg_replace(self::$_whitespace_pattern," ", $text); break; case "pre-line": //XXX: Is this correct? $str = preg_replace( "/[ \t]+/u", " ", $text); case "pre-wrap": // Find the longest word (i.e. minimum length) $lines = array_flip(preg_split("/\n/", $text)); /*foreach($words as &$word) { $word = Font_Metrics::get_text_width($word, $font, $size, $word_spacing, $char_spacing); }*/ array_walk($lines, create_function('&$val,$str', '$val = Font_Metrics::get_text_width($str, "'.$font.'", '.$size.', '.$word_spacing.', '.$char_spacing.');')); arsort($lines); reset($lines); $str = key($lines); break; } $max = Font_Metrics::get_text_width($str, $font, $size, $word_spacing, $char_spacing); $delta = $style->length_in_pt(array($style->margin_left, $style->border_left_width, $style->padding_left, $style->padding_right, $style->border_right_width, $style->margin_right), $line_width); $min += $delta; $max += $delta; return $this->_min_max_cache = array($min, $max, "min" => $min, "max" => $max); } }