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<?php
/**
* @package dompdf
* @link http://www.dompdf.com/
* @author Benj Carson <benjcarson@digitaljunkies.ca>
* @license http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
* @version $Id: frame_reflower.cls.php 448 2011-11-13 13:00:03Z fabien.menager $
*/
/**
* Base reflower class
*
* Reflower objects are responsible for determining the width and height of
* individual frames. They also create line and page breaks as necessary.
*
* @access private
* @package dompdf
*/
abstract class Frame_Reflower {
/**
* Frame for this reflower
*
* @var Frame
*/
protected $_frame;
/**
* Cached min/max size
*
* @var array
*/
protected $_min_max_cache;
function __construct(Frame $frame) {
$this->_frame = $frame;
$this->_min_max_cache = null;
}
function dispose() {
clear_object($this);
}
/**
* Collapse frames margins
* http://www.w3.org/TR/CSS2/box.html#collapsing-margins
*/
protected function _collapse_margins() {
$frame = $this->_frame;
$cb = $frame->get_containing_block();
$style = $frame->get_style();
if ( !$frame->is_in_flow() ) {
return;
}
$t = $style->length_in_pt($style->margin_top, $cb["h"]);
$b = $style->length_in_pt($style->margin_bottom, $cb["h"]);
// Handle 'auto' values
if ( $t === "auto" ) {
$style->margin_top = "0pt";
$t = 0;
}
if ( $b === "auto" ) {
$style->margin_bottom = "0pt";
$b = 0;
}
// Collapse vertical margins:
$n = $frame->get_next_sibling();
if ( $n && !$n->is_block() ) {
while ( $n = $n->get_next_sibling() ) {
if ( $n->is_block() ) {
break;
}
if ( !$n->get_first_child() ) {
$n = null;
break;
}
}
}
if ( $n ) {
$n_style = $n->get_style();
$b = max($b, $n_style->length_in_pt($n_style->margin_top, $cb["h"]));
$n_style->margin_top = "0pt";
$style->margin_bottom = $b."pt";
}
// Collapse our first child's margin
/*$f = $this->_frame->get_first_child();
if ( $f && !$f->is_block() ) {
while ( $f = $f->get_next_sibling() ) {
if ( $f->is_block() ) {
break;
}
if ( !$f->get_first_child() ) {
$f = null;
break;
}
}
}
// Margin are collapsed only between block elements
if ( $f ) {
$f_style = $f->get_style();
$t = max($t, $f_style->length_in_pt($f_style->margin_top, $cb["h"]));
$style->margin_top = $t."pt";
$f_style->margin_bottom = "0pt";
}*/
}
//........................................................................
abstract function reflow(Frame_Decorator $block = null);
//........................................................................
// Required for table layout: Returns an array(0 => min, 1 => max, "min"
// => min, "max" => max) of the minimum and maximum widths of this frame.
// This provides a basic implementation. Child classes should override
// this if necessary.
function get_min_max_width() {
if ( !is_null($this->_min_max_cache) ) {
return $this->_min_max_cache;
}
$style = $this->_frame->get_style();
// Account for margins & padding
$dims = array($style->padding_left,
$style->padding_right,
$style->border_left_width,
$style->border_right_width,
$style->margin_left,
$style->margin_right);
$cb_w = $this->_frame->get_containing_block("w");
$delta = $style->length_in_pt($dims, $cb_w);
// Handle degenerate case
if ( !$this->_frame->get_first_child() )
return $this->_min_max_cache = array($delta, $delta,"min" => $delta, "max" => $delta);
$low = array();
$high = array();
for ( $iter = $this->_frame->get_children()->getIterator();
$iter->valid();
$iter->next() ) {
$inline_min = 0;
$inline_max = 0;
// Add all adjacent inline widths together to calculate max width
while ( $iter->valid() && in_array( $iter->current()->get_style()->display, Style::$INLINE_TYPES ) ) {
$child = $iter->current();
$minmax = $child->get_min_max_width();
if ( in_array( $iter->current()->get_style()->white_space, array("pre", "nowrap") ) )
$inline_min += $minmax["min"];
else
$low[] = $minmax["min"];
$inline_max += $minmax["max"];
$iter->next();
}
if ( $inline_max > 0 )
$high[] = $inline_max;
if ( $inline_min > 0 )
$low[] = $inline_min;
if ( $iter->valid() ) {
list($low[], $high[]) = $iter->current()->get_min_max_width();
continue;
}
}
$min = count($low) ? max($low) : 0;
$max = count($high) ? max($high) : 0;
// Use specified width if it is greater than the minimum defined by the
// content. If the width is a percentage ignore it for now.
$width = $style->width;
if ( $width !== "auto" && !is_percent($width) ) {
$width = $style->length_in_pt($width, $cb_w);
if ( $min < $width )
$min = $width;
if ( $max < $width )
$max = $width;
}
$min += $delta;
$max += $delta;
return $this->_min_max_cache = array($min, $max, "min"=>$min, "max"=>$max);
}
/**
* Parses a CSS string containing quotes and escaped hex characters
*
* @param $string string The CSS string to parse
* @param $single_trim
* @return string
*/
protected function _parse_string($string, $single_trim = false) {
if ($single_trim) {
$string = preg_replace("/^[\"\']/", "", $string);
$string = preg_replace("/[\"\']$/", "", $string);
}
else {
$string = trim($string, "'\"");
}
$string = str_replace(array("\\\n",'\\"',"\\'"),
array("",'"',"'"), $string);
// Convert escaped hex characters into ascii characters (e.g. \A => newline)
$string = preg_replace_callback("/\\\\([0-9a-fA-F]{0,6})(\s)?(?(2)|(?=[^0-9a-fA-F]))/",
create_function('$matches',
'return chr(hexdec($matches[1]));'),
$string);
return $string;
}
/**
* Parses a CSS "quotes" property
*
* @return array An array of pairs of quotes
*/
protected function _parse_quotes() {
// Matches quote types
$re = "/(\'[^\']*\')|(\"[^\"]*\")/";
$quotes = $this->_frame->get_style()->quotes;
// split on spaces, except within quotes
if (!preg_match_all($re, "$quotes", $matches, PREG_SET_ORDER))
return;
$quotes_array = array();
foreach($matches as &$_quote){
$quotes_array[] = $this->_parse_string($_quote[0], true);
}
if ( empty($quotes_array) ) {
$quotes_array = array('"', '"');
}
return array_chunk($quotes_array, 2);
}
/**
* Parses the CSS "content" property
*
* @return string The resulting string
*/
protected function _parse_content() {
// Matches generated content
$re = "/\n".
"\s(counters?\\([^)]*\\))|\n".
"\A(counters?\\([^)]*\\))|\n".
"\s([\"']) ( (?:[^\"']|\\\\[\"'])+ )(?<!\\\\)\\3|\n".
"\A([\"']) ( (?:[^\"']|\\\\[\"'])+ )(?<!\\\\)\\5|\n" .
"\s([^\s\"']+)|\n" .
"\A([^\s\"']+)\n".
"/xi";
$content = $this->_frame->get_style()->content;
$quotes = $this->_parse_quotes();
// split on spaces, except within quotes
if (!preg_match_all($re, $content, $matches, PREG_SET_ORDER))
return;
$text = "";
foreach ($matches as $match) {
if ( isset($match[2]) && $match[2] !== "" )
$match[1] = $match[2];
if ( isset($match[6]) && $match[6] !== "" )
$match[4] = $match[6];
if ( isset($match[8]) && $match[8] !== "" )
$match[7] = $match[8];
if ( isset($match[1]) && $match[1] !== "" ) {
// counters?(...)
$match[1] = mb_strtolower(trim($match[1]));
// Handle counter() references:
// http://www.w3.org/TR/CSS21/generate.html#content
$i = mb_strpos($match[1], ")");
if ( $i === false )
continue;
$args = explode(",", mb_substr($match[1], 8, $i - 8));
$counter_id = $args[0];
if ( $match[1][7] === "(" ) {
// counter(name [,style])
if ( isset($args[1]) )
$type = trim($args[1]);
else
$type = null;
$p = $this->_frame->lookup_counter_frame($counter_id);
$text .= $p->counter_value($counter_id, $type);
} else if ( $match[1][7] === "s" ) {
// counters(name, string [,style])
if ( isset($args[1]) )
$string = $this->_parse_string(trim($args[1]));
else
$string = "";
if ( isset($args[2]) )
$type = $args[2];
else
$type = null;
$p = $this->_frame->lookup_counter_frame($counter_id);
$tmp = "";
while ($p) {
$tmp = $p->counter_value($counter_id, $type) . $string . $tmp;
$p = $p->lookup_counter_frame($counter_id);
}
$text .= $tmp;
} else
// countertops?
continue;
} else if ( isset($match[4]) && $match[4] !== "" ) {
// String match
$text .= $this->_parse_string($match[4]);
} else if ( isset($match[7]) && $match[7] !== "" ) {
// Directive match
if ( $match[7] === "open-quote" ) {
// FIXME: do something here
$text .= $quotes[0][0];
} else if ( $match[7] === "close-quote" ) {
// FIXME: do something else here
$text .= $quotes[0][1];
} else if ( $match[7] === "no-open-quote" ) {
// FIXME:
} else if ( $match[7] === "no-close-quote" ) {
// FIXME:
} else if ( mb_strpos($match[7],"attr(") === 0 ) {
$i = mb_strpos($match[7],")");
if ( $i === false )
continue;
$attr = mb_substr($match[7], 5, $i - 5);
if ( $attr == "" )
continue;
$text .= $this->_frame->get_parent()->get_node()->getAttribute($attr);
} else
continue;
}
}
return $text;
}
/**
* Sets the generated content of a generated frame
*/
protected function _set_content(){
$frame = $this->_frame;
$style = $frame->get_style();
if ( $style->content && !$frame->get_first_child() && $frame->get_node()->nodeName === "dompdf_generated" ) {
$content = $this->_parse_content();
$node = $frame->get_node()->ownerDocument->createTextNode($content);
$new_style = $style->get_stylesheet()->create_style();
$new_style->inherit($style);
$new_frame = new Frame($node);
$new_frame->set_style($new_style);
Frame_Factory::decorate_frame($new_frame, $frame->get_dompdf());
$new_frame->get_decorator()->set_root($frame->get_root());
$frame->append_child($new_frame);
}
if ( $style->counter_reset && ($reset = $style->counter_reset) !== "none" )
$frame->reset_counter($reset);
if ( $style->counter_increment && ($increment = $style->counter_increment) !== "none" )
$frame->increment_counters($increment);
}
}